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Annotation of mandoc/roff.c, Revision 1.250

1.250   ! schwarze    1: /*     $Id: roff.c,v 1.249 2015/01/14 22:58:16 schwarze Exp $ */
1.1       kristaps    2: /*
1.247     schwarze    3:  * Copyright (c) 2010, 2011, 2012, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
                      4:  * Copyright (c) 2010-2015 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
1.66      kristaps    7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    9:  *
1.106     kristaps   10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
1.66      kristaps   11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.106     kristaps   12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
1.66      kristaps   13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   17:  */
1.66      kristaps   18: #include "config.h"
1.225     schwarze   19:
                     20: #include <sys/types.h>
1.30      kristaps   21:
1.67      kristaps   22: #include <assert.h>
1.85      kristaps   23: #include <ctype.h>
1.245     schwarze   24: #include <limits.h>
1.178     schwarze   25: #include <stdio.h>
1.1       kristaps   26: #include <stdlib.h>
1.67      kristaps   27: #include <string.h>
1.1       kristaps   28:
1.67      kristaps   29: #include "mandoc.h"
1.201     schwarze   30: #include "mandoc_aux.h"
1.226     schwarze   31: #include "libmandoc.h"
1.109     kristaps   32: #include "libroff.h"
1.33      kristaps   33:
1.141     kristaps   34: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   35: #define        RSTACK_MAX      128
                     36:
1.170     schwarze   37: /* Maximum number of string expansions per line, to break infinite loops. */
                     38: #define        EXPAND_LIMIT    1000
                     39:
1.67      kristaps   40: enum   rofft {
1.103     kristaps   41:        ROFF_ad,
1.80      kristaps   42:        ROFF_am,
                     43:        ROFF_ami,
                     44:        ROFF_am1,
1.193     schwarze   45:        ROFF_as,
1.174     kristaps   46:        ROFF_cc,
1.194     schwarze   47:        ROFF_ce,
1.80      kristaps   48:        ROFF_de,
                     49:        ROFF_dei,
                     50:        ROFF_de1,
1.83      schwarze   51:        ROFF_ds,
1.82      kristaps   52:        ROFF_el,
1.185     schwarze   53:        ROFF_fam,
1.186     schwarze   54:        ROFF_hw,
1.103     kristaps   55:        ROFF_hy,
1.82      kristaps   56:        ROFF_ie,
1.75      kristaps   57:        ROFF_if,
1.76      kristaps   58:        ROFF_ig,
1.123     schwarze   59:        ROFF_it,
1.103     kristaps   60:        ROFF_ne,
                     61:        ROFF_nh,
1.104     kristaps   62:        ROFF_nr,
1.124     schwarze   63:        ROFF_ns,
1.229     schwarze   64:        ROFF_pl,
1.124     schwarze   65:        ROFF_ps,
1.83      schwarze   66:        ROFF_rm,
1.203     schwarze   67:        ROFF_rr,
1.105     kristaps   68:        ROFF_so,
1.124     schwarze   69:        ROFF_ta,
1.83      schwarze   70:        ROFF_tr,
1.175     schwarze   71:        ROFF_Dd,
                     72:        ROFF_TH,
1.109     kristaps   73:        ROFF_TS,
                     74:        ROFF_TE,
1.112     kristaps   75:        ROFF_T_,
1.125     kristaps   76:        ROFF_EQ,
                     77:        ROFF_EN,
1.250   ! schwarze   78:        ROFF_IX,
1.76      kristaps   79:        ROFF_cblock,
1.106     kristaps   80:        ROFF_USERDEF,
1.67      kristaps   81:        ROFF_MAX
                     82: };
                     83:
1.147     kristaps   84: /*
1.167     kristaps   85:  * An incredibly-simple string buffer.
                     86:  */
1.94      kristaps   87: struct roffstr {
1.167     kristaps   88:        char            *p; /* nil-terminated buffer */
                     89:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   90: };
                     91:
                     92: /*
1.167     kristaps   93:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   94:  */
                     95: struct roffkv {
                     96:        struct roffstr   key;
                     97:        struct roffstr   val;
                     98:        struct roffkv   *next; /* next in list */
1.94      kristaps   99: };
                    100:
1.180     schwarze  101: /*
                    102:  * A single number register as part of a singly-linked list.
                    103:  */
                    104: struct roffreg {
                    105:        struct roffstr   key;
1.181     schwarze  106:        int              val;
1.180     schwarze  107:        struct roffreg  *next;
                    108: };
                    109:
1.67      kristaps  110: struct roff {
1.128     kristaps  111:        struct mparse   *parse; /* parse point */
1.237     schwarze  112:        const struct mchars *mchars; /* character table */
1.67      kristaps  113:        struct roffnode *last; /* leaf of stack */
1.223     schwarze  114:        int             *rstack; /* stack of inverted `ie' values */
1.180     schwarze  115:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  116:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  117:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    118:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  119:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  120:        struct tbl_node *first_tbl; /* first table parsed */
                    121:        struct tbl_node *last_tbl; /* last table parsed */
                    122:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  123:        struct eqn_node *last_eqn; /* last equation parsed */
                    124:        struct eqn_node *first_eqn; /* first equation parsed */
                    125:        struct eqn_node *eqn; /* current equation being parsed */
1.230     schwarze  126:        int              eqn_inline; /* current equation is inline */
1.223     schwarze  127:        int              options; /* parse options */
                    128:        int              rstacksz; /* current size limit of rstack */
                    129:        int              rstackpos; /* position in rstack */
1.227     schwarze  130:        int              format; /* current file in mdoc or man format */
1.223     schwarze  131:        char             control; /* control character */
1.79      kristaps  132: };
                    133:
1.67      kristaps  134: struct roffnode {
                    135:        enum rofft       tok; /* type of node */
                    136:        struct roffnode *parent; /* up one in stack */
                    137:        int              line; /* parse line */
                    138:        int              col; /* parse col */
1.106     kristaps  139:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  140:        char            *end; /* end-rules: custom token */
                    141:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  142:        int              rule; /* current evaluation rule */
1.67      kristaps  143: };
                    144:
                    145: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  146:                         enum rofft tok, /* tok of macro */ \
1.238     schwarze  147:                         struct buf *buf, /* input buffer */ \
1.67      kristaps  148:                         int ln, /* parse line */ \
1.75      kristaps  149:                         int ppos, /* original pos in buffer */ \
                    150:                         int pos, /* current pos in buffer */ \
1.74      kristaps  151:                         int *offs /* reset offset of buffer data */
1.67      kristaps  152:
                    153: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    154:
                    155: struct roffmac {
                    156:        const char      *name; /* macro name */
1.79      kristaps  157:        roffproc         proc; /* process new macro */
                    158:        roffproc         text; /* process as child text of macro */
                    159:        roffproc         sub; /* process as child of macro */
                    160:        int              flags;
                    161: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  162:        struct roffmac  *next;
1.67      kristaps  163: };
                    164:
1.141     kristaps  165: struct predef {
                    166:        const char      *name; /* predefined input name */
                    167:        const char      *str; /* replacement symbol */
                    168: };
                    169:
                    170: #define        PREDEF(__name, __str) \
                    171:        { (__name), (__str) },
                    172:
1.155     kristaps  173: static enum rofft       roffhash_find(const char *, size_t);
                    174: static void             roffhash_init(void);
                    175: static void             roffnode_cleanscope(struct roff *);
                    176: static void             roffnode_pop(struct roff *);
                    177: static void             roffnode_push(struct roff *, enum rofft,
                    178:                                const char *, int, int);
1.80      kristaps  179: static enum rofferr     roff_block(ROFF_ARGS);
                    180: static enum rofferr     roff_block_text(ROFF_ARGS);
                    181: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    182: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  183: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  184: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  185: static enum rofferr     roff_cond(ROFF_ARGS);
                    186: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    187: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  188: static enum rofferr     roff_ds(ROFF_ARGS);
1.238     schwarze  189: static enum rofferr     roff_eqndelim(struct roff *, struct buf *, int);
1.234     kristaps  190: static int              roff_evalcond(struct roff *r, int,
                    191:                                const char *, int *);
                    192: static int              roff_evalnum(struct roff *, int,
                    193:                                const char *, int *, int *, int);
                    194: static int              roff_evalpar(struct roff *, int,
                    195:                                const char *, int *, int *);
1.198     schwarze  196: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  197: static void             roff_free1(struct roff *);
1.180     schwarze  198: static void             roff_freereg(struct roffreg *);
1.167     kristaps  199: static void             roff_freestr(struct roffkv *);
1.212     schwarze  200: static size_t           roff_getname(struct roff *, char **, int, int);
1.184     schwarze  201: static int              roff_getnum(const char *, int *, int *);
                    202: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  203: static int              roff_getregn(const struct roff *,
                    204:                                const char *, size_t);
1.192     schwarze  205: static int              roff_getregro(const char *name);
1.207     schwarze  206: static const char      *roff_getstrn(const struct roff *,
1.94      kristaps  207:                                const char *, size_t);
1.178     schwarze  208: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  209: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  210: static enum rofferr     roff_nr(ROFF_ARGS);
1.214     schwarze  211: static enum rofft       roff_parse(struct roff *, char *, int *,
                    212:                                int, int);
1.238     schwarze  213: static enum rofferr     roff_parsetext(struct buf *, int, int *);
                    214: static enum rofferr     roff_res(struct roff *, struct buf *, int, int);
1.122     schwarze  215: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  216: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  217: static void             roff_setstr(struct roff *,
1.106     kristaps  218:                                const char *, const char *, int);
1.207     schwarze  219: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  220:                                size_t, const char *, size_t, int);
1.105     kristaps  221: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  222: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  223: static enum rofferr     roff_Dd(ROFF_ARGS);
                    224: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  225: static enum rofferr     roff_TE(ROFF_ARGS);
                    226: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  227: static enum rofferr     roff_EQ(ROFF_ARGS);
                    228: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  229: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  230: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  231:
1.155     kristaps  232: /* See roffhash_find() */
1.85      kristaps  233:
                    234: #define        ASCII_HI         126
                    235: #define        ASCII_LO         33
                    236: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    237:
                    238: static struct roffmac  *hash[HASHWIDTH];
                    239:
                    240: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  241:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  242:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    243:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    244:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  245:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  246:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  247:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  248:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    249:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    250:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  251:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  252:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  253:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  254:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  255:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  256:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    257:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    258:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  259:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  260:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    261:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  262:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  263:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
1.229     schwarze  264:        { "pl", roff_line_ignore, NULL, NULL, 0, NULL },
1.124     schwarze  265:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  266:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  267:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  268:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  269:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  270:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  271:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    272:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  273:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    274:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  275:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  276:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    277:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.250   ! schwarze  278:        { "IX", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  279:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  280:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  281: };
                    282:
1.200     schwarze  283: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  284: const  char *const __mdoc_reserved[] = {
                    285:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    286:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    287:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    288:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  289:        "Dt", "Dv", "Dx", "D1",
                    290:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    291:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  292:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  293:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    294:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  295:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  296:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    297:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    298:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  299:        "Ss", "St", "Sx", "Sy",
                    300:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  301:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  302:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    303:        NULL
                    304: };
                    305:
1.200     schwarze  306: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  307: const  char *const __man_reserved[] = {
1.200     schwarze  308:        "AT", "B", "BI", "BR", "DT",
                    309:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    310:        "LP", "OP", "P", "PD", "PP",
                    311:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    312:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  313:        NULL
                    314: };
                    315:
1.141     kristaps  316: /* Array of injected predefined strings. */
                    317: #define        PREDEFS_MAX      38
                    318: static const struct predef predefs[PREDEFS_MAX] = {
                    319: #include "predefs.in"
                    320: };
                    321:
1.155     kristaps  322: /* See roffhash_find() */
1.85      kristaps  323: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    324:
1.178     schwarze  325: static int      roffit_lines;  /* number of lines to delay */
                    326: static char    *roffit_macro;  /* nil-terminated macro line */
                    327:
1.207     schwarze  328:
1.85      kristaps  329: static void
1.155     kristaps  330: roffhash_init(void)
1.85      kristaps  331: {
                    332:        struct roffmac   *n;
                    333:        int               buc, i;
                    334:
1.106     kristaps  335:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  336:                assert(roffs[i].name[0] >= ASCII_LO);
                    337:                assert(roffs[i].name[0] <= ASCII_HI);
                    338:
                    339:                buc = ROFF_HASH(roffs[i].name);
                    340:
                    341:                if (NULL != (n = hash[buc])) {
                    342:                        for ( ; n->next; n = n->next)
                    343:                                /* Do nothing. */ ;
                    344:                        n->next = &roffs[i];
                    345:                } else
                    346:                        hash[buc] = &roffs[i];
                    347:        }
                    348: }
                    349:
1.67      kristaps  350: /*
                    351:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    352:  * the nil-terminated string name could be found.
                    353:  */
                    354: static enum rofft
1.155     kristaps  355: roffhash_find(const char *p, size_t s)
1.67      kristaps  356: {
1.85      kristaps  357:        int              buc;
                    358:        struct roffmac  *n;
1.67      kristaps  359:
1.85      kristaps  360:        /*
                    361:         * libroff has an extremely simple hashtable, for the time
                    362:         * being, which simply keys on the first character, which must
                    363:         * be printable, then walks a chain.  It works well enough until
                    364:         * optimised.
                    365:         */
                    366:
                    367:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    368:                return(ROFF_MAX);
                    369:
                    370:        buc = ROFF_HASH(p);
                    371:
                    372:        if (NULL == (n = hash[buc]))
                    373:                return(ROFF_MAX);
                    374:        for ( ; n; n = n->next)
1.106     kristaps  375:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  376:                        return((enum rofft)(n - roffs));
1.67      kristaps  377:
                    378:        return(ROFF_MAX);
                    379: }
                    380:
                    381: /*
                    382:  * Pop the current node off of the stack of roff instructions currently
                    383:  * pending.
                    384:  */
                    385: static void
                    386: roffnode_pop(struct roff *r)
                    387: {
                    388:        struct roffnode *p;
                    389:
1.75      kristaps  390:        assert(r->last);
1.207     schwarze  391:        p = r->last;
1.82      kristaps  392:
1.75      kristaps  393:        r->last = r->last->parent;
1.106     kristaps  394:        free(p->name);
                    395:        free(p->end);
1.67      kristaps  396:        free(p);
                    397: }
                    398:
                    399: /*
                    400:  * Push a roff node onto the instruction stack.  This must later be
                    401:  * removed with roffnode_pop().
                    402:  */
1.98      schwarze  403: static void
1.106     kristaps  404: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    405:                int line, int col)
1.67      kristaps  406: {
                    407:        struct roffnode *p;
                    408:
1.98      schwarze  409:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  410:        p->tok = tok;
1.106     kristaps  411:        if (name)
                    412:                p->name = mandoc_strdup(name);
1.67      kristaps  413:        p->parent = r->last;
                    414:        p->line = line;
                    415:        p->col = col;
1.198     schwarze  416:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  417:
                    418:        r->last = p;
                    419: }
                    420:
                    421: static void
                    422: roff_free1(struct roff *r)
                    423: {
1.176     schwarze  424:        struct tbl_node *tbl;
1.125     kristaps  425:        struct eqn_node *e;
1.167     kristaps  426:        int              i;
1.67      kristaps  427:
1.176     schwarze  428:        while (NULL != (tbl = r->first_tbl)) {
                    429:                r->first_tbl = tbl->next;
                    430:                tbl_free(tbl);
1.109     kristaps  431:        }
1.113     kristaps  432:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    433:
1.125     kristaps  434:        while (NULL != (e = r->first_eqn)) {
                    435:                r->first_eqn = e->next;
                    436:                eqn_free(e);
                    437:        }
                    438:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    439:
1.67      kristaps  440:        while (r->last)
                    441:                roffnode_pop(r);
1.109     kristaps  442:
1.223     schwarze  443:        free (r->rstack);
                    444:        r->rstack = NULL;
                    445:        r->rstacksz = 0;
                    446:        r->rstackpos = -1;
                    447:
                    448:        roff_freereg(r->regtab);
                    449:        r->regtab = NULL;
                    450:
1.167     kristaps  451:        roff_freestr(r->strtab);
                    452:        roff_freestr(r->xmbtab);
                    453:        r->strtab = r->xmbtab = NULL;
                    454:
                    455:        if (r->xtab)
                    456:                for (i = 0; i < 128; i++)
                    457:                        free(r->xtab[i].p);
                    458:        free(r->xtab);
                    459:        r->xtab = NULL;
1.67      kristaps  460: }
                    461:
                    462: void
                    463: roff_reset(struct roff *r)
                    464: {
                    465:
                    466:        roff_free1(r);
1.227     schwarze  467:        r->format = r->options & (MPARSE_MDOC | MPARSE_MAN);
1.174     kristaps  468:        r->control = 0;
1.67      kristaps  469: }
                    470:
                    471: void
                    472: roff_free(struct roff *r)
                    473: {
                    474:
                    475:        roff_free1(r);
                    476:        free(r);
                    477: }
                    478:
                    479: struct roff *
1.237     schwarze  480: roff_alloc(struct mparse *parse, const struct mchars *mchars, int options)
1.67      kristaps  481: {
                    482:        struct roff     *r;
                    483:
1.98      schwarze  484:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  485:        r->parse = parse;
1.237     schwarze  486:        r->mchars = mchars;
1.199     schwarze  487:        r->options = options;
1.227     schwarze  488:        r->format = options & (MPARSE_MDOC | MPARSE_MAN);
1.82      kristaps  489:        r->rstackpos = -1;
1.207     schwarze  490:
1.155     kristaps  491:        roffhash_init();
1.141     kristaps  492:
1.67      kristaps  493:        return(r);
                    494: }
                    495:
1.94      kristaps  496: /*
1.206     schwarze  497:  * In the current line, expand escape sequences that tend to get
                    498:  * used in numerical expressions and conditional requests.
                    499:  * Also check the syntax of the remaining escape sequences.
1.154     kristaps  500:  */
1.172     schwarze  501: static enum rofferr
1.238     schwarze  502: roff_res(struct roff *r, struct buf *buf, int ln, int pos)
1.94      kristaps  503: {
1.208     schwarze  504:        char             ubuf[24]; /* buffer to print the number */
1.205     schwarze  505:        const char      *start; /* start of the string to process */
1.209     schwarze  506:        char            *stesc; /* start of an escape sequence ('\\') */
1.108     schwarze  507:        const char      *stnam; /* start of the name, after "[(*" */
                    508:        const char      *cp;    /* end of the name, e.g. before ']' */
                    509:        const char      *res;   /* the string to be substituted */
1.238     schwarze  510:        char            *nbuf;  /* new buffer to copy buf->buf to */
1.181     schwarze  511:        size_t           maxl;  /* expected length of the escape name */
                    512:        size_t           naml;  /* actual length of the escape name */
1.237     schwarze  513:        enum mandoc_esc  esc;   /* type of the escape sequence */
                    514:        int              inaml; /* length returned from mandoc_escape() */
1.181     schwarze  515:        int              expand_count;  /* to avoid infinite loops */
1.206     schwarze  516:        int              npos;  /* position in numeric expression */
1.218     schwarze  517:        int              arg_complete; /* argument not interrupted by eol */
1.206     schwarze  518:        char             term;  /* character terminating the escape */
1.94      kristaps  519:
1.170     schwarze  520:        expand_count = 0;
1.238     schwarze  521:        start = buf->buf + pos;
1.205     schwarze  522:        stesc = strchr(start, '\0') - 1;
                    523:        while (stesc-- > start) {
1.170     schwarze  524:
1.205     schwarze  525:                /* Search backwards for the next backslash. */
                    526:
1.238     schwarze  527:                if (*stesc != '\\')
1.205     schwarze  528:                        continue;
                    529:
                    530:                /* If it is escaped, skip it. */
                    531:
                    532:                for (cp = stesc - 1; cp >= start; cp--)
1.238     schwarze  533:                        if (*cp != '\\')
1.205     schwarze  534:                                break;
                    535:
1.238     schwarze  536:                if ((stesc - cp) % 2 == 0) {
1.209     schwarze  537:                        stesc = (char *)cp;
1.205     schwarze  538:                        continue;
                    539:                }
1.108     schwarze  540:
1.206     schwarze  541:                /* Decide whether to expand or to check only. */
1.108     schwarze  542:
1.206     schwarze  543:                term = '\0';
1.205     schwarze  544:                cp = stesc + 1;
1.181     schwarze  545:                switch (*cp) {
1.207     schwarze  546:                case '*':
1.181     schwarze  547:                        res = NULL;
                    548:                        break;
1.207     schwarze  549:                case 'B':
1.206     schwarze  550:                        /* FALLTHROUGH */
1.207     schwarze  551:                case 'w':
1.206     schwarze  552:                        term = cp[1];
                    553:                        /* FALLTHROUGH */
1.207     schwarze  554:                case 'n':
1.181     schwarze  555:                        res = ubuf;
                    556:                        break;
                    557:                default:
1.237     schwarze  558:                        esc = mandoc_escape(&cp, &stnam, &inaml);
                    559:                        if (esc == ESCAPE_ERROR ||
                    560:                            (esc == ESCAPE_SPECIAL &&
                    561:                             mchars_spec2cp(r->mchars, stnam, inaml) < 0))
1.219     schwarze  562:                                mandoc_vmsg(MANDOCERR_ESC_BAD,
1.238     schwarze  563:                                    r->parse, ln, (int)(stesc - buf->buf),
1.219     schwarze  564:                                    "%.*s", (int)(cp - stesc), stesc);
1.205     schwarze  565:                        continue;
1.152     kristaps  566:                }
                    567:
1.205     schwarze  568:                if (EXPAND_LIMIT < ++expand_count) {
                    569:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
1.238     schwarze  570:                            ln, (int)(stesc - buf->buf), NULL);
1.205     schwarze  571:                        return(ROFF_IGN);
                    572:                }
1.108     schwarze  573:
                    574:                /*
                    575:                 * The third character decides the length
1.181     schwarze  576:                 * of the name of the string or register.
1.108     schwarze  577:                 * Save a pointer to the name.
                    578:                 */
                    579:
1.238     schwarze  580:                if (term == '\0') {
1.206     schwarze  581:                        switch (*++cp) {
1.207     schwarze  582:                        case '\0':
1.206     schwarze  583:                                maxl = 0;
                    584:                                break;
1.207     schwarze  585:                        case '(':
1.206     schwarze  586:                                cp++;
                    587:                                maxl = 2;
                    588:                                break;
1.207     schwarze  589:                        case '[':
1.206     schwarze  590:                                cp++;
                    591:                                term = ']';
                    592:                                maxl = 0;
                    593:                                break;
                    594:                        default:
                    595:                                maxl = 1;
                    596:                                break;
                    597:                        }
                    598:                } else {
                    599:                        cp += 2;
1.94      kristaps  600:                        maxl = 0;
                    601:                }
1.108     schwarze  602:                stnam = cp;
1.94      kristaps  603:
1.108     schwarze  604:                /* Advance to the end of the name. */
1.94      kristaps  605:
1.218     schwarze  606:                arg_complete = 1;
1.238     schwarze  607:                for (naml = 0; maxl == 0 || naml < maxl; naml++, cp++) {
                    608:                        if (*cp == '\0') {
1.219     schwarze  609:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze  610:                                    ln, (int)(stesc - buf->buf), stesc);
1.218     schwarze  611:                                arg_complete = 0;
1.206     schwarze  612:                                break;
1.153     kristaps  613:                        }
1.238     schwarze  614:                        if (maxl == 0 && *cp == term) {
1.206     schwarze  615:                                cp++;
1.94      kristaps  616:                                break;
1.206     schwarze  617:                        }
1.94      kristaps  618:                }
                    619:
1.108     schwarze  620:                /*
                    621:                 * Retrieve the replacement string; if it is
                    622:                 * undefined, resume searching for escapes.
                    623:                 */
                    624:
1.206     schwarze  625:                switch (stesc[1]) {
1.207     schwarze  626:                case '*':
1.218     schwarze  627:                        if (arg_complete)
                    628:                                res = roff_getstrn(r, stnam, naml);
1.206     schwarze  629:                        break;
1.207     schwarze  630:                case 'B':
1.206     schwarze  631:                        npos = 0;
1.218     schwarze  632:                        ubuf[0] = arg_complete &&
1.234     kristaps  633:                            roff_evalnum(r, ln, stnam, &npos, NULL, 0) &&
1.218     schwarze  634:                            stnam + npos + 1 == cp ? '1' : '0';
1.206     schwarze  635:                        ubuf[1] = '\0';
                    636:                        break;
1.207     schwarze  637:                case 'n':
1.218     schwarze  638:                        if (arg_complete)
                    639:                                (void)snprintf(ubuf, sizeof(ubuf), "%d",
                    640:                                    roff_getregn(r, stnam, naml));
                    641:                        else
                    642:                                ubuf[0] = '\0';
1.206     schwarze  643:                        break;
1.207     schwarze  644:                case 'w':
1.218     schwarze  645:                        /* use even incomplete args */
1.208     schwarze  646:                        (void)snprintf(ubuf, sizeof(ubuf), "%d",
1.206     schwarze  647:                            24 * (int)naml);
                    648:                        break;
                    649:                }
1.94      kristaps  650:
1.238     schwarze  651:                if (res == NULL) {
1.219     schwarze  652:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze  653:                            r->parse, ln, (int)(stesc - buf->buf),
1.219     schwarze  654:                            "%.*s", (int)naml, stnam);
1.142     kristaps  655:                        res = "";
1.246     schwarze  656:                } else if (buf->sz + strlen(res) > SHRT_MAX) {
                    657:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
                    658:                            ln, (int)(stesc - buf->buf), NULL);
                    659:                        return(ROFF_IGN);
1.94      kristaps  660:                }
                    661:
1.108     schwarze  662:                /* Replace the escape sequence by the string. */
                    663:
1.209     schwarze  664:                *stesc = '\0';
1.238     schwarze  665:                buf->sz = mandoc_asprintf(&nbuf, "%s%s%s",
                    666:                    buf->buf, res, cp) + 1;
1.94      kristaps  667:
1.205     schwarze  668:                /* Prepare for the next replacement. */
1.94      kristaps  669:
1.205     schwarze  670:                start = nbuf + pos;
1.238     schwarze  671:                stesc = nbuf + (stesc - buf->buf) + strlen(res);
                    672:                free(buf->buf);
                    673:                buf->buf = nbuf;
1.154     kristaps  674:        }
1.172     schwarze  675:        return(ROFF_CONT);
1.154     kristaps  676: }
                    677:
                    678: /*
1.178     schwarze  679:  * Process text streams:
                    680:  * Convert all breakable hyphens into ASCII_HYPH.
                    681:  * Decrement and spring input line trap.
1.154     kristaps  682:  */
                    683: static enum rofferr
1.238     schwarze  684: roff_parsetext(struct buf *buf, int pos, int *offs)
1.154     kristaps  685: {
                    686:        size_t           sz;
                    687:        const char      *start;
1.178     schwarze  688:        char            *p;
                    689:        int              isz;
1.154     kristaps  690:        enum mandoc_esc  esc;
                    691:
1.238     schwarze  692:        start = p = buf->buf + pos;
1.154     kristaps  693:
1.238     schwarze  694:        while (*p != '\0') {
1.154     kristaps  695:                sz = strcspn(p, "-\\");
                    696:                p += sz;
                    697:
1.238     schwarze  698:                if (*p == '\0')
1.159     kristaps  699:                        break;
                    700:
1.238     schwarze  701:                if (*p == '\\') {
1.154     kristaps  702:                        /* Skip over escapes. */
                    703:                        p++;
1.189     schwarze  704:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.238     schwarze  705:                        if (esc == ESCAPE_ERROR)
1.154     kristaps  706:                                break;
1.155     kristaps  707:                        continue;
1.159     kristaps  708:                } else if (p == start) {
1.158     kristaps  709:                        p++;
1.155     kristaps  710:                        continue;
1.158     kristaps  711:                }
1.155     kristaps  712:
1.171     schwarze  713:                if (isalpha((unsigned char)p[-1]) &&
                    714:                    isalpha((unsigned char)p[1]))
1.155     kristaps  715:                        *p = ASCII_HYPH;
                    716:                p++;
1.94      kristaps  717:        }
                    718:
1.178     schwarze  719:        /* Spring the input line trap. */
1.238     schwarze  720:        if (roffit_lines == 1) {
                    721:                isz = mandoc_asprintf(&p, "%s\n.%s", buf->buf, roffit_macro);
                    722:                free(buf->buf);
                    723:                buf->buf = p;
                    724:                buf->sz = isz + 1;
1.178     schwarze  725:                *offs = 0;
                    726:                free(roffit_macro);
                    727:                roffit_lines = 0;
                    728:                return(ROFF_REPARSE);
1.238     schwarze  729:        } else if (roffit_lines > 1)
1.178     schwarze  730:                --roffit_lines;
1.154     kristaps  731:        return(ROFF_CONT);
1.94      kristaps  732: }
                    733:
1.67      kristaps  734: enum rofferr
1.238     schwarze  735: roff_parseln(struct roff *r, int ln, struct buf *buf, int *offs)
1.67      kristaps  736: {
                    737:        enum rofft       t;
1.109     kristaps  738:        enum rofferr     e;
1.238     schwarze  739:        int              pos;   /* parse point */
1.243     schwarze  740:        int              spos;  /* saved parse point for messages */
1.238     schwarze  741:        int              ppos;  /* original offset in buf->buf */
                    742:        int              ctl;   /* macro line (boolean) */
                    743:
                    744:        ppos = pos = *offs;
1.79      kristaps  745:
1.230     schwarze  746:        /* Handle in-line equation delimiters. */
                    747:
1.236     schwarze  748:        if (r->tbl == NULL &&
                    749:            r->last_eqn != NULL && r->last_eqn->delim &&
1.230     schwarze  750:            (r->eqn == NULL || r->eqn_inline)) {
1.238     schwarze  751:                e = roff_eqndelim(r, buf, pos);
1.230     schwarze  752:                if (e == ROFF_REPARSE)
                    753:                        return(e);
                    754:                assert(e == ROFF_CONT);
                    755:        }
                    756:
                    757:        /* Expand some escape sequences. */
1.94      kristaps  758:
1.238     schwarze  759:        e = roff_res(r, buf, ln, pos);
                    760:        if (e == ROFF_IGN)
1.172     schwarze  761:                return(e);
1.238     schwarze  762:        assert(e == ROFF_CONT);
1.94      kristaps  763:
1.238     schwarze  764:        ctl = roff_getcontrol(r, buf->buf, &pos);
1.130     kristaps  765:
1.94      kristaps  766:        /*
1.79      kristaps  767:         * First, if a scope is open and we're not a macro, pass the
                    768:         * text through the macro's filter.  If a scope isn't open and
                    769:         * we're not a macro, just let it through.
1.125     kristaps  770:         * Finally, if there's an equation scope open, divert it into it
                    771:         * no matter our state.
1.79      kristaps  772:         */
1.74      kristaps  773:
1.130     kristaps  774:        if (r->last && ! ctl) {
1.78      kristaps  775:                t = r->last->tok;
                    776:                assert(roffs[t].text);
1.238     schwarze  777:                e = (*roffs[t].text)(r, t, buf, ln, pos, pos, offs);
                    778:                assert(e == ROFF_IGN || e == ROFF_CONT);
                    779:                if (e != ROFF_CONT)
1.125     kristaps  780:                        return(e);
1.182     schwarze  781:        }
                    782:        if (r->eqn)
1.238     schwarze  783:                return(eqn_read(&r->eqn, ln, buf->buf, ppos, offs));
1.182     schwarze  784:        if ( ! ctl) {
1.125     kristaps  785:                if (r->tbl)
1.238     schwarze  786:                        return(tbl_read(r->tbl, ln, buf->buf, pos));
                    787:                return(roff_parsetext(buf, pos, offs));
1.182     schwarze  788:        }
1.228     schwarze  789:
                    790:        /* Skip empty request lines. */
                    791:
1.238     schwarze  792:        if (buf->buf[pos] == '"') {
1.228     schwarze  793:                mandoc_msg(MANDOCERR_COMMENT_BAD, r->parse,
                    794:                    ln, pos, NULL);
                    795:                return(ROFF_IGN);
1.238     schwarze  796:        } else if (buf->buf[pos] == '\0')
1.228     schwarze  797:                return(ROFF_IGN);
1.67      kristaps  798:
1.79      kristaps  799:        /*
                    800:         * If a scope is open, go to the child handler for that macro,
                    801:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  802:         * Don't do so if an equation is open.
1.79      kristaps  803:         */
1.78      kristaps  804:
1.79      kristaps  805:        if (r->last) {
                    806:                t = r->last->tok;
                    807:                assert(roffs[t].sub);
1.238     schwarze  808:                return((*roffs[t].sub)(r, t, buf, ln, ppos, pos, offs));
1.79      kristaps  809:        }
1.78      kristaps  810:
1.243     schwarze  811:        /* No scope is open.  This is a new request or macro. */
                    812:
                    813:        spos = pos;
                    814:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
                    815:
                    816:        /* Tables ignore most macros. */
                    817:
                    818:        if (r->tbl != NULL && (t == ROFF_MAX || t == ROFF_TS)) {
                    819:                mandoc_msg(MANDOCERR_TBLMACRO, r->parse,
                    820:                    ln, pos, buf->buf + spos);
                    821:                return(ROFF_IGN);
                    822:        }
                    823:
1.79      kristaps  824:        /*
1.243     schwarze  825:         * This is neither a roff request nor a user-defined macro.
                    826:         * Let the standard macro set parsers handle it.
1.79      kristaps  827:         */
1.67      kristaps  828:
1.243     schwarze  829:        if (t == ROFF_MAX)
1.79      kristaps  830:                return(ROFF_CONT);
1.243     schwarze  831:
                    832:        /* Execute a roff request or a user defined macro. */
1.67      kristaps  833:
1.75      kristaps  834:        assert(roffs[t].proc);
1.238     schwarze  835:        return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.74      kristaps  836: }
                    837:
1.117     kristaps  838: void
1.74      kristaps  839: roff_endparse(struct roff *r)
                    840: {
                    841:
1.110     kristaps  842:        if (r->last)
1.221     schwarze  843:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    844:                    r->last->line, r->last->col,
                    845:                    roffs[r->last->tok].name);
1.117     kristaps  846:
1.125     kristaps  847:        if (r->eqn) {
1.221     schwarze  848:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    849:                    r->eqn->eqn.ln, r->eqn->eqn.pos, "EQ");
1.151     kristaps  850:                eqn_end(&r->eqn);
1.125     kristaps  851:        }
                    852:
1.117     kristaps  853:        if (r->tbl) {
1.221     schwarze  854:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    855:                    r->tbl->line, r->tbl->pos, "TS");
1.151     kristaps  856:                tbl_end(&r->tbl);
1.117     kristaps  857:        }
1.67      kristaps  858: }
                    859:
                    860: /*
                    861:  * Parse a roff node's type from the input buffer.  This must be in the
                    862:  * form of ".foo xxx" in the usual way.
                    863:  */
                    864: static enum rofft
1.214     schwarze  865: roff_parse(struct roff *r, char *buf, int *pos, int ln, int ppos)
1.67      kristaps  866: {
1.214     schwarze  867:        char            *cp;
1.106     kristaps  868:        const char      *mac;
                    869:        size_t           maclen;
1.67      kristaps  870:        enum rofft       t;
                    871:
1.214     schwarze  872:        cp = buf + *pos;
                    873:
                    874:        if ('\0' == *cp || '"' == *cp || '\t' == *cp || ' ' == *cp)
1.67      kristaps  875:                return(ROFF_MAX);
                    876:
1.214     schwarze  877:        mac = cp;
                    878:        maclen = roff_getname(r, &cp, ln, ppos);
1.67      kristaps  879:
1.106     kristaps  880:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  881:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  882:
1.214     schwarze  883:        if (ROFF_MAX != t)
                    884:                *pos = cp - buf;
1.67      kristaps  885:
                    886:        return(t);
                    887: }
                    888:
                    889: static enum rofferr
1.76      kristaps  890: roff_cblock(ROFF_ARGS)
1.67      kristaps  891: {
                    892:
1.79      kristaps  893:        /*
                    894:         * A block-close `..' should only be invoked as a child of an
                    895:         * ignore macro, otherwise raise a warning and just ignore it.
                    896:         */
                    897:
1.238     schwarze  898:        if (r->last == NULL) {
1.221     schwarze  899:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    900:                    ln, ppos, "..");
1.76      kristaps  901:                return(ROFF_IGN);
                    902:        }
1.67      kristaps  903:
1.81      kristaps  904:        switch (r->last->tok) {
1.207     schwarze  905:        case ROFF_am:
1.220     schwarze  906:                /* ROFF_am1 is remapped to ROFF_am in roff_block(). */
1.81      kristaps  907:                /* FALLTHROUGH */
1.207     schwarze  908:        case ROFF_ami:
1.81      kristaps  909:                /* FALLTHROUGH */
1.207     schwarze  910:        case ROFF_de:
1.108     schwarze  911:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  912:                /* FALLTHROUGH */
1.207     schwarze  913:        case ROFF_dei:
1.81      kristaps  914:                /* FALLTHROUGH */
1.207     schwarze  915:        case ROFF_ig:
1.81      kristaps  916:                break;
                    917:        default:
1.221     schwarze  918:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    919:                    ln, ppos, "..");
1.67      kristaps  920:                return(ROFF_IGN);
1.76      kristaps  921:        }
1.67      kristaps  922:
1.238     schwarze  923:        if (buf->buf[pos] != '\0')
1.217     schwarze  924:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
1.238     schwarze  925:                    ".. %s", buf->buf + pos);
1.71      kristaps  926:
                    927:        roffnode_pop(r);
1.76      kristaps  928:        roffnode_cleanscope(r);
                    929:        return(ROFF_IGN);
1.71      kristaps  930:
1.67      kristaps  931: }
                    932:
1.76      kristaps  933: static void
                    934: roffnode_cleanscope(struct roff *r)
1.67      kristaps  935: {
                    936:
1.76      kristaps  937:        while (r->last) {
1.173     schwarze  938:                if (--r->last->endspan != 0)
1.76      kristaps  939:                        break;
                    940:                roffnode_pop(r);
                    941:        }
1.67      kristaps  942: }
                    943:
1.195     schwarze  944: static void
                    945: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  946: {
                    947:
1.76      kristaps  948:        if (NULL == r->last) {
1.221     schwarze  949:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    950:                    ln, ppos, "\\}");
1.195     schwarze  951:                return;
1.76      kristaps  952:        }
                    953:
1.82      kristaps  954:        switch (r->last->tok) {
1.207     schwarze  955:        case ROFF_el:
1.82      kristaps  956:                /* FALLTHROUGH */
1.207     schwarze  957:        case ROFF_ie:
1.82      kristaps  958:                /* FALLTHROUGH */
1.207     schwarze  959:        case ROFF_if:
1.82      kristaps  960:                break;
                    961:        default:
1.221     schwarze  962:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    963:                    ln, ppos, "\\}");
1.195     schwarze  964:                return;
1.75      kristaps  965:        }
                    966:
1.76      kristaps  967:        if (r->last->endspan > -1) {
1.221     schwarze  968:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    969:                    ln, ppos, "\\}");
1.195     schwarze  970:                return;
1.76      kristaps  971:        }
                    972:
1.75      kristaps  973:        roffnode_pop(r);
1.76      kristaps  974:        roffnode_cleanscope(r);
1.195     schwarze  975:        return;
1.76      kristaps  976: }
                    977:
                    978: static enum rofferr
1.80      kristaps  979: roff_block(ROFF_ARGS)
1.76      kristaps  980: {
1.220     schwarze  981:        const char      *name;
                    982:        char            *iname, *cp;
1.213     schwarze  983:        size_t           namesz;
1.106     kristaps  984:
1.220     schwarze  985:        /* Ignore groff compatibility mode for now. */
1.76      kristaps  986:
1.238     schwarze  987:        if (tok == ROFF_de1)
1.220     schwarze  988:                tok = ROFF_de;
1.238     schwarze  989:        else if (tok == ROFF_am1)
1.220     schwarze  990:                tok = ROFF_am;
                    991:
                    992:        /* Parse the macro name argument. */
                    993:
1.238     schwarze  994:        cp = buf->buf + pos;
                    995:        if (tok == ROFF_ig) {
1.220     schwarze  996:                iname = NULL;
                    997:                namesz = 0;
                    998:        } else {
                    999:                iname = cp;
                   1000:                namesz = roff_getname(r, &cp, ln, ppos);
                   1001:                iname[namesz] = '\0';
                   1002:        }
1.107     kristaps 1003:
1.220     schwarze 1004:        /* Resolve the macro name argument if it is indirect. */
1.107     kristaps 1005:
1.238     schwarze 1006:        if (namesz && (tok == ROFF_dei || tok == ROFF_ami)) {
                   1007:                if ((name = roff_getstrn(r, iname, namesz)) == NULL) {
1.220     schwarze 1008:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze 1009:                            r->parse, ln, (int)(iname - buf->buf),
1.220     schwarze 1010:                            "%.*s", (int)namesz, iname);
                   1011:                        namesz = 0;
                   1012:                } else
                   1013:                        namesz = strlen(name);
                   1014:        } else
                   1015:                name = iname;
1.107     kristaps 1016:
1.238     schwarze 1017:        if (namesz == 0 && tok != ROFF_ig) {
1.220     schwarze 1018:                mandoc_msg(MANDOCERR_REQ_EMPTY, r->parse,
                   1019:                    ln, ppos, roffs[tok].name);
                   1020:                return(ROFF_IGN);
                   1021:        }
1.80      kristaps 1022:
1.106     kristaps 1023:        roffnode_push(r, tok, name, ln, ppos);
                   1024:
                   1025:        /*
                   1026:         * At the beginning of a `de' macro, clear the existing string
                   1027:         * with the same name, if there is one.  New content will be
1.193     schwarze 1028:         * appended from roff_block_text() in multiline mode.
1.106     kristaps 1029:         */
1.107     kristaps 1030:
1.238     schwarze 1031:        if (tok == ROFF_de || tok == ROFF_dei)
1.213     schwarze 1032:                roff_setstrn(&r->strtab, name, namesz, "", 0, 0);
1.76      kristaps 1033:
1.238     schwarze 1034:        if (*cp == '\0')
1.78      kristaps 1035:                return(ROFF_IGN);
                   1036:
1.220     schwarze 1037:        /* Get the custom end marker. */
1.107     kristaps 1038:
1.220     schwarze 1039:        iname = cp;
1.213     schwarze 1040:        namesz = roff_getname(r, &cp, ln, ppos);
1.220     schwarze 1041:
                   1042:        /* Resolve the end marker if it is indirect. */
                   1043:
1.238     schwarze 1044:        if (namesz && (tok == ROFF_dei || tok == ROFF_ami)) {
                   1045:                if ((name = roff_getstrn(r, iname, namesz)) == NULL) {
1.220     schwarze 1046:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze 1047:                            r->parse, ln, (int)(iname - buf->buf),
1.220     schwarze 1048:                            "%.*s", (int)namesz, iname);
                   1049:                        namesz = 0;
                   1050:                } else
                   1051:                        namesz = strlen(name);
                   1052:        } else
                   1053:                name = iname;
                   1054:
1.213     schwarze 1055:        if (namesz)
                   1056:                r->last->end = mandoc_strndup(name, namesz);
1.78      kristaps 1057:
1.238     schwarze 1058:        if (*cp != '\0')
1.217     schwarze 1059:                mandoc_vmsg(MANDOCERR_ARG_EXCESS, r->parse,
                   1060:                    ln, pos, ".%s ... %s", roffs[tok].name, cp);
1.74      kristaps 1061:
1.78      kristaps 1062:        return(ROFF_IGN);
                   1063: }
                   1064:
                   1065: static enum rofferr
1.80      kristaps 1066: roff_block_sub(ROFF_ARGS)
1.79      kristaps 1067: {
                   1068:        enum rofft      t;
                   1069:        int             i, j;
                   1070:
                   1071:        /*
                   1072:         * First check whether a custom macro exists at this level.  If
                   1073:         * it does, then check against it.  This is some of groff's
                   1074:         * stranger behaviours.  If we encountered a custom end-scope
                   1075:         * tag and that tag also happens to be a "real" macro, then we
                   1076:         * need to try interpreting it again as a real macro.  If it's
                   1077:         * not, then return ignore.  Else continue.
                   1078:         */
                   1079:
                   1080:        if (r->last->end) {
1.130     kristaps 1081:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.238     schwarze 1082:                        if (buf->buf[i] != r->last->end[j])
1.79      kristaps 1083:                                break;
                   1084:
1.238     schwarze 1085:                if (r->last->end[j] == '\0' &&
                   1086:                    (buf->buf[i] == '\0' ||
                   1087:                     buf->buf[i] == ' ' ||
                   1088:                     buf->buf[i] == '\t')) {
1.79      kristaps 1089:                        roffnode_pop(r);
                   1090:                        roffnode_cleanscope(r);
                   1091:
1.238     schwarze 1092:                        while (buf->buf[i] == ' ' || buf->buf[i] == '\t')
1.130     kristaps 1093:                                i++;
                   1094:
                   1095:                        pos = i;
1.238     schwarze 1096:                        if (roff_parse(r, buf->buf, &pos, ln, ppos) !=
                   1097:                            ROFF_MAX)
1.79      kristaps 1098:                                return(ROFF_RERUN);
                   1099:                        return(ROFF_IGN);
                   1100:                }
                   1101:        }
                   1102:
                   1103:        /*
                   1104:         * If we have no custom end-query or lookup failed, then try
                   1105:         * pulling it out of the hashtable.
                   1106:         */
                   1107:
1.238     schwarze 1108:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
1.79      kristaps 1109:
1.238     schwarze 1110:        if (t != ROFF_cblock) {
                   1111:                if (tok != ROFF_ig)
                   1112:                        roff_setstr(r, r->last->name, buf->buf + ppos, 2);
1.79      kristaps 1113:                return(ROFF_IGN);
1.106     kristaps 1114:        }
1.79      kristaps 1115:
                   1116:        assert(roffs[t].proc);
1.238     schwarze 1117:        return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.79      kristaps 1118: }
                   1119:
                   1120: static enum rofferr
1.80      kristaps 1121: roff_block_text(ROFF_ARGS)
1.78      kristaps 1122: {
                   1123:
1.238     schwarze 1124:        if (tok != ROFF_ig)
                   1125:                roff_setstr(r, r->last->name, buf->buf + pos, 2);
1.106     kristaps 1126:
1.78      kristaps 1127:        return(ROFF_IGN);
                   1128: }
                   1129:
                   1130: static enum rofferr
1.82      kristaps 1131: roff_cond_sub(ROFF_ARGS)
                   1132: {
                   1133:        enum rofft       t;
1.139     kristaps 1134:        char            *ep;
1.198     schwarze 1135:        int              rr;
1.82      kristaps 1136:
                   1137:        rr = r->last->rule;
1.139     kristaps 1138:        roffnode_cleanscope(r);
1.238     schwarze 1139:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
1.82      kristaps 1140:
1.139     kristaps 1141:        /*
1.177     schwarze 1142:         * Fully handle known macros when they are structurally
                   1143:         * required or when the conditional evaluated to true.
1.87      kristaps 1144:         */
                   1145:
1.238     schwarze 1146:        if ((t != ROFF_MAX) &&
                   1147:            (rr || roffs[t].flags & ROFFMAC_STRUCT)) {
1.177     schwarze 1148:                assert(roffs[t].proc);
1.238     schwarze 1149:                return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.177     schwarze 1150:        }
1.144     kristaps 1151:
1.196     schwarze 1152:        /*
                   1153:         * If `\}' occurs on a macro line without a preceding macro,
                   1154:         * drop the line completely.
                   1155:         */
                   1156:
1.238     schwarze 1157:        ep = buf->buf + pos;
                   1158:        if (ep[0] == '\\' && ep[1] == '}')
1.198     schwarze 1159:                rr = 0;
1.196     schwarze 1160:
1.177     schwarze 1161:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1162:
1.238     schwarze 1163:        while ((ep = strchr(ep, '\\')) != NULL) {
                   1164:                if (*(++ep) == '}') {
1.197     schwarze 1165:                        *ep = '&';
1.238     schwarze 1166:                        roff_ccond(r, ln, ep - buf->buf - 1);
1.197     schwarze 1167:                }
1.247     schwarze 1168:                if (*ep != '\0')
                   1169:                        ++ep;
1.177     schwarze 1170:        }
1.198     schwarze 1171:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1172: }
                   1173:
                   1174: static enum rofferr
                   1175: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1176: {
1.140     kristaps 1177:        char            *ep;
1.198     schwarze 1178:        int              rr;
1.82      kristaps 1179:
                   1180:        rr = r->last->rule;
1.140     kristaps 1181:        roffnode_cleanscope(r);
1.82      kristaps 1182:
1.238     schwarze 1183:        ep = buf->buf + pos;
                   1184:        while ((ep = strchr(ep, '\\')) != NULL) {
                   1185:                if (*(++ep) == '}') {
1.197     schwarze 1186:                        *ep = '&';
1.238     schwarze 1187:                        roff_ccond(r, ln, ep - buf->buf - 1);
1.197     schwarze 1188:                }
1.247     schwarze 1189:                if (*ep != '\0')
                   1190:                        ++ep;
1.78      kristaps 1191:        }
1.198     schwarze 1192:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1193: }
                   1194:
1.204     schwarze 1195: /*
                   1196:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1197:  * If there is at least one digit, return success and advance the
                   1198:  * parse point, else return failure and let the parse point unchanged.
                   1199:  * Ignore overflows, treat them just like the C language.
                   1200:  */
1.184     schwarze 1201: static int
                   1202: roff_getnum(const char *v, int *pos, int *res)
                   1203: {
1.206     schwarze 1204:        int      myres, n, p;
                   1205:
                   1206:        if (NULL == res)
                   1207:                res = &myres;
1.184     schwarze 1208:
                   1209:        p = *pos;
                   1210:        n = v[p] == '-';
                   1211:        if (n)
                   1212:                p++;
                   1213:
                   1214:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1215:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1216:        if (p == *pos + n)
                   1217:                return 0;
                   1218:
                   1219:        if (n)
                   1220:                *res = -*res;
                   1221:
                   1222:        *pos = p;
                   1223:        return 1;
                   1224: }
                   1225:
1.198     schwarze 1226: /*
                   1227:  * Evaluate a string comparison condition.
                   1228:  * The first character is the delimiter.
                   1229:  * Succeed if the string up to its second occurrence
                   1230:  * matches the string up to its third occurence.
                   1231:  * Advance the cursor after the third occurrence
                   1232:  * or lacking that, to the end of the line.
                   1233:  */
                   1234: static int
                   1235: roff_evalstrcond(const char *v, int *pos)
                   1236: {
                   1237:        const char      *s1, *s2, *s3;
                   1238:        int              match;
                   1239:
                   1240:        match = 0;
                   1241:        s1 = v + *pos;          /* initial delimiter */
                   1242:        s2 = s1 + 1;            /* for scanning the first string */
                   1243:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1244:
                   1245:        if (NULL == s3)         /* found no middle delimiter */
                   1246:                goto out;
                   1247:
                   1248:        while ('\0' != *++s3) {
                   1249:                if (*s2 != *s3) {  /* mismatch */
                   1250:                        s3 = strchr(s3, *s1);
                   1251:                        break;
                   1252:                }
                   1253:                if (*s3 == *s1) {  /* found the final delimiter */
                   1254:                        match = 1;
                   1255:                        break;
                   1256:                }
                   1257:                s2++;
                   1258:        }
                   1259:
                   1260: out:
                   1261:        if (NULL == s3)
                   1262:                s3 = strchr(s2, '\0');
1.242     schwarze 1263:        else if (*s3 != '\0')
1.198     schwarze 1264:                s3++;
                   1265:        *pos = s3 - v;
                   1266:        return(match);
                   1267: }
                   1268:
1.204     schwarze 1269: /*
                   1270:  * Evaluate an optionally negated single character, numerical,
                   1271:  * or string condition.
                   1272:  */
1.198     schwarze 1273: static int
1.234     kristaps 1274: roff_evalcond(struct roff *r, int ln, const char *v, int *pos)
1.88      kristaps 1275: {
1.241     schwarze 1276:        int      number, savepos, wanttrue;
1.88      kristaps 1277:
1.198     schwarze 1278:        if ('!' == v[*pos]) {
                   1279:                wanttrue = 0;
                   1280:                (*pos)++;
                   1281:        } else
                   1282:                wanttrue = 1;
                   1283:
1.88      kristaps 1284:        switch (v[*pos]) {
1.240     schwarze 1285:        case '\0':
                   1286:                return(0);
1.207     schwarze 1287:        case 'n':
1.198     schwarze 1288:                /* FALLTHROUGH */
1.207     schwarze 1289:        case 'o':
1.88      kristaps 1290:                (*pos)++;
1.198     schwarze 1291:                return(wanttrue);
1.207     schwarze 1292:        case 'c':
1.198     schwarze 1293:                /* FALLTHROUGH */
1.207     schwarze 1294:        case 'd':
1.198     schwarze 1295:                /* FALLTHROUGH */
1.207     schwarze 1296:        case 'e':
1.88      kristaps 1297:                /* FALLTHROUGH */
1.207     schwarze 1298:        case 'r':
1.88      kristaps 1299:                /* FALLTHROUGH */
1.207     schwarze 1300:        case 't':
1.239     schwarze 1301:                /* FALLTHROUGH */
                   1302:        case 'v':
1.88      kristaps 1303:                (*pos)++;
1.198     schwarze 1304:                return(!wanttrue);
1.88      kristaps 1305:        default:
                   1306:                break;
                   1307:        }
                   1308:
1.241     schwarze 1309:        savepos = *pos;
1.234     kristaps 1310:        if (roff_evalnum(r, ln, v, pos, &number, 0))
1.204     schwarze 1311:                return((number > 0) == wanttrue);
1.241     schwarze 1312:        else if (*pos == savepos)
                   1313:                return(roff_evalstrcond(v, pos) == wanttrue);
1.204     schwarze 1314:        else
1.241     schwarze 1315:                return (0);
1.88      kristaps 1316: }
                   1317:
1.74      kristaps 1318: static enum rofferr
1.103     kristaps 1319: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1320: {
1.123     schwarze 1321:
1.89      kristaps 1322:        return(ROFF_IGN);
                   1323: }
                   1324:
1.104     kristaps 1325: static enum rofferr
1.82      kristaps 1326: roff_cond(ROFF_ARGS)
1.74      kristaps 1327: {
1.173     schwarze 1328:
                   1329:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1330:
1.207     schwarze 1331:        /*
1.134     kristaps 1332:         * An `.el' has no conditional body: it will consume the value
                   1333:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1334:         * defaults to DENY.
1.134     kristaps 1335:         *
                   1336:         * If we're not an `el', however, then evaluate the conditional.
                   1337:         */
1.133     kristaps 1338:
1.238     schwarze 1339:        r->last->rule = tok == ROFF_el ?
1.207     schwarze 1340:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
1.238     schwarze 1341:            roff_evalcond(r, ln, buf->buf, &pos);
1.77      kristaps 1342:
1.134     kristaps 1343:        /*
                   1344:         * An if-else will put the NEGATION of the current evaluated
                   1345:         * conditional into the stack of rules.
                   1346:         */
                   1347:
1.238     schwarze 1348:        if (tok == ROFF_ie) {
1.223     schwarze 1349:                if (r->rstackpos + 1 == r->rstacksz) {
                   1350:                        r->rstacksz += 16;
                   1351:                        r->rstack = mandoc_reallocarray(r->rstack,
                   1352:                            r->rstacksz, sizeof(int));
1.134     kristaps 1353:                }
1.198     schwarze 1354:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1355:        }
1.88      kristaps 1356:
                   1357:        /* If the parent has false as its rule, then so do we. */
                   1358:
1.198     schwarze 1359:        if (r->last->parent && !r->last->parent->rule)
                   1360:                r->last->rule = 0;
1.88      kristaps 1361:
                   1362:        /*
1.173     schwarze 1363:         * Determine scope.
                   1364:         * If there is nothing on the line after the conditional,
                   1365:         * not even whitespace, use next-line scope.
1.88      kristaps 1366:         */
1.74      kristaps 1367:
1.238     schwarze 1368:        if (buf->buf[pos] == '\0') {
1.173     schwarze 1369:                r->last->endspan = 2;
                   1370:                goto out;
                   1371:        }
                   1372:
1.238     schwarze 1373:        while (buf->buf[pos] == ' ')
1.173     schwarze 1374:                pos++;
                   1375:
                   1376:        /* An opening brace requests multiline scope. */
1.75      kristaps 1377:
1.238     schwarze 1378:        if (buf->buf[pos] == '\\' && buf->buf[pos + 1] == '{') {
1.75      kristaps 1379:                r->last->endspan = -1;
                   1380:                pos += 2;
1.173     schwarze 1381:                goto out;
1.207     schwarze 1382:        }
1.74      kristaps 1383:
1.77      kristaps 1384:        /*
1.173     schwarze 1385:         * Anything else following the conditional causes
                   1386:         * single-line scope.  Warn if the scope contains
                   1387:         * nothing but trailing whitespace.
1.77      kristaps 1388:         */
                   1389:
1.238     schwarze 1390:        if (buf->buf[pos] == '\0')
1.216     schwarze 1391:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1392:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1393:
1.173     schwarze 1394:        r->last->endspan = 1;
1.74      kristaps 1395:
1.173     schwarze 1396: out:
1.75      kristaps 1397:        *offs = pos;
                   1398:        return(ROFF_RERUN);
1.83      schwarze 1399: }
                   1400:
                   1401: static enum rofferr
1.92      schwarze 1402: roff_ds(ROFF_ARGS)
                   1403: {
1.212     schwarze 1404:        char            *string;
                   1405:        const char      *name;
                   1406:        size_t           namesz;
1.96      kristaps 1407:
                   1408:        /*
1.212     schwarze 1409:         * The first word is the name of the string.
                   1410:         * If it is empty or terminated by an escape sequence,
                   1411:         * abort the `ds' request without defining anything.
1.96      kristaps 1412:         */
1.92      schwarze 1413:
1.238     schwarze 1414:        name = string = buf->buf + pos;
                   1415:        if (*name == '\0')
1.92      schwarze 1416:                return(ROFF_IGN);
                   1417:
1.212     schwarze 1418:        namesz = roff_getname(r, &string, ln, pos);
1.238     schwarze 1419:        if (name[namesz] == '\\')
1.212     schwarze 1420:                return(ROFF_IGN);
                   1421:
                   1422:        /* Read past the initial double-quote, if any. */
1.238     schwarze 1423:        if (*string == '"')
1.92      schwarze 1424:                string++;
                   1425:
1.96      kristaps 1426:        /* The rest is the value. */
1.212     schwarze 1427:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1428:            ROFF_as == tok);
1.92      schwarze 1429:        return(ROFF_IGN);
                   1430: }
                   1431:
1.204     schwarze 1432: /*
                   1433:  * Parse a single operator, one or two characters long.
                   1434:  * If the operator is recognized, return success and advance the
                   1435:  * parse point, else return failure and let the parse point unchanged.
                   1436:  */
                   1437: static int
                   1438: roff_getop(const char *v, int *pos, char *res)
                   1439: {
                   1440:
                   1441:        *res = v[*pos];
                   1442:
                   1443:        switch (*res) {
1.207     schwarze 1444:        case '+':
1.204     schwarze 1445:                /* FALLTHROUGH */
1.207     schwarze 1446:        case '-':
1.204     schwarze 1447:                /* FALLTHROUGH */
1.207     schwarze 1448:        case '*':
1.204     schwarze 1449:                /* FALLTHROUGH */
1.207     schwarze 1450:        case '/':
1.204     schwarze 1451:                /* FALLTHROUGH */
1.207     schwarze 1452:        case '%':
1.204     schwarze 1453:                /* FALLTHROUGH */
1.207     schwarze 1454:        case '&':
1.204     schwarze 1455:                /* FALLTHROUGH */
1.207     schwarze 1456:        case ':':
1.204     schwarze 1457:                break;
                   1458:        case '<':
                   1459:                switch (v[*pos + 1]) {
1.207     schwarze 1460:                case '=':
1.204     schwarze 1461:                        *res = 'l';
                   1462:                        (*pos)++;
                   1463:                        break;
1.207     schwarze 1464:                case '>':
1.204     schwarze 1465:                        *res = '!';
                   1466:                        (*pos)++;
                   1467:                        break;
1.207     schwarze 1468:                case '?':
1.204     schwarze 1469:                        *res = 'i';
                   1470:                        (*pos)++;
                   1471:                        break;
                   1472:                default:
                   1473:                        break;
                   1474:                }
                   1475:                break;
                   1476:        case '>':
                   1477:                switch (v[*pos + 1]) {
1.207     schwarze 1478:                case '=':
1.204     schwarze 1479:                        *res = 'g';
                   1480:                        (*pos)++;
                   1481:                        break;
1.207     schwarze 1482:                case '?':
1.204     schwarze 1483:                        *res = 'a';
                   1484:                        (*pos)++;
                   1485:                        break;
                   1486:                default:
                   1487:                        break;
                   1488:                }
                   1489:                break;
                   1490:        case '=':
                   1491:                if ('=' == v[*pos + 1])
                   1492:                        (*pos)++;
                   1493:                break;
                   1494:        default:
                   1495:                return(0);
                   1496:        }
                   1497:        (*pos)++;
                   1498:
                   1499:        return(*res);
                   1500: }
                   1501:
                   1502: /*
                   1503:  * Evaluate either a parenthesized numeric expression
                   1504:  * or a single signed integer number.
                   1505:  */
                   1506: static int
1.235     schwarze 1507: roff_evalpar(struct roff *r, int ln,
1.234     kristaps 1508:        const char *v, int *pos, int *res)
1.204     schwarze 1509: {
                   1510:
                   1511:        if ('(' != v[*pos])
                   1512:                return(roff_getnum(v, pos, res));
                   1513:
                   1514:        (*pos)++;
1.234     kristaps 1515:        if ( ! roff_evalnum(r, ln, v, pos, res, 1))
1.204     schwarze 1516:                return(0);
                   1517:
1.206     schwarze 1518:        /*
                   1519:         * Omission of the closing parenthesis
                   1520:         * is an error in validation mode,
                   1521:         * but ignored in evaluation mode.
                   1522:         */
                   1523:
1.204     schwarze 1524:        if (')' == v[*pos])
                   1525:                (*pos)++;
1.206     schwarze 1526:        else if (NULL == res)
                   1527:                return(0);
1.204     schwarze 1528:
                   1529:        return(1);
                   1530: }
                   1531:
                   1532: /*
                   1533:  * Evaluate a complete numeric expression.
                   1534:  * Proceed left to right, there is no concept of precedence.
                   1535:  */
                   1536: static int
1.235     schwarze 1537: roff_evalnum(struct roff *r, int ln, const char *v,
1.234     kristaps 1538:        int *pos, int *res, int skipwhite)
1.204     schwarze 1539: {
                   1540:        int              mypos, operand2;
                   1541:        char             operator;
                   1542:
                   1543:        if (NULL == pos) {
                   1544:                mypos = 0;
                   1545:                pos = &mypos;
                   1546:        }
                   1547:
                   1548:        if (skipwhite)
                   1549:                while (isspace((unsigned char)v[*pos]))
                   1550:                        (*pos)++;
                   1551:
1.234     kristaps 1552:        if ( ! roff_evalpar(r, ln, v, pos, res))
1.204     schwarze 1553:                return(0);
                   1554:
                   1555:        while (1) {
                   1556:                if (skipwhite)
                   1557:                        while (isspace((unsigned char)v[*pos]))
                   1558:                                (*pos)++;
                   1559:
                   1560:                if ( ! roff_getop(v, pos, &operator))
                   1561:                        break;
                   1562:
                   1563:                if (skipwhite)
                   1564:                        while (isspace((unsigned char)v[*pos]))
                   1565:                                (*pos)++;
                   1566:
1.234     kristaps 1567:                if ( ! roff_evalpar(r, ln, v, pos, &operand2))
1.204     schwarze 1568:                        return(0);
                   1569:
                   1570:                if (skipwhite)
                   1571:                        while (isspace((unsigned char)v[*pos]))
                   1572:                                (*pos)++;
1.206     schwarze 1573:
                   1574:                if (NULL == res)
                   1575:                        continue;
1.204     schwarze 1576:
                   1577:                switch (operator) {
1.207     schwarze 1578:                case '+':
1.204     schwarze 1579:                        *res += operand2;
                   1580:                        break;
1.207     schwarze 1581:                case '-':
1.204     schwarze 1582:                        *res -= operand2;
                   1583:                        break;
1.207     schwarze 1584:                case '*':
1.204     schwarze 1585:                        *res *= operand2;
                   1586:                        break;
1.207     schwarze 1587:                case '/':
1.244     schwarze 1588:                        if (operand2 == 0) {
1.235     schwarze 1589:                                mandoc_msg(MANDOCERR_DIVZERO,
1.234     kristaps 1590:                                        r->parse, ln, *pos, v);
                   1591:                                *res = 0;
                   1592:                                break;
                   1593:                        }
1.204     schwarze 1594:                        *res /= operand2;
                   1595:                        break;
1.207     schwarze 1596:                case '%':
1.244     schwarze 1597:                        if (operand2 == 0) {
                   1598:                                mandoc_msg(MANDOCERR_DIVZERO,
                   1599:                                        r->parse, ln, *pos, v);
                   1600:                                *res = 0;
                   1601:                                break;
                   1602:                        }
1.204     schwarze 1603:                        *res %= operand2;
                   1604:                        break;
1.207     schwarze 1605:                case '<':
1.204     schwarze 1606:                        *res = *res < operand2;
                   1607:                        break;
1.207     schwarze 1608:                case '>':
1.204     schwarze 1609:                        *res = *res > operand2;
                   1610:                        break;
1.207     schwarze 1611:                case 'l':
1.204     schwarze 1612:                        *res = *res <= operand2;
                   1613:                        break;
1.207     schwarze 1614:                case 'g':
1.204     schwarze 1615:                        *res = *res >= operand2;
                   1616:                        break;
1.207     schwarze 1617:                case '=':
1.204     schwarze 1618:                        *res = *res == operand2;
                   1619:                        break;
1.207     schwarze 1620:                case '!':
1.204     schwarze 1621:                        *res = *res != operand2;
                   1622:                        break;
1.207     schwarze 1623:                case '&':
1.204     schwarze 1624:                        *res = *res && operand2;
                   1625:                        break;
1.207     schwarze 1626:                case ':':
1.204     schwarze 1627:                        *res = *res || operand2;
                   1628:                        break;
1.207     schwarze 1629:                case 'i':
1.204     schwarze 1630:                        if (operand2 < *res)
                   1631:                                *res = operand2;
                   1632:                        break;
1.207     schwarze 1633:                case 'a':
1.204     schwarze 1634:                        if (operand2 > *res)
                   1635:                                *res = operand2;
                   1636:                        break;
                   1637:                default:
                   1638:                        abort();
                   1639:                }
                   1640:        }
                   1641:        return(1);
                   1642: }
                   1643:
1.180     schwarze 1644: void
1.187     schwarze 1645: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1646: {
1.180     schwarze 1647:        struct roffreg  *reg;
                   1648:
                   1649:        /* Search for an existing register with the same name. */
                   1650:        reg = r->regtab;
                   1651:
                   1652:        while (reg && strcmp(name, reg->key.p))
                   1653:                reg = reg->next;
1.147     kristaps 1654:
1.180     schwarze 1655:        if (NULL == reg) {
                   1656:                /* Create a new register. */
                   1657:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1658:                reg->key.p = mandoc_strdup(name);
                   1659:                reg->key.sz = strlen(name);
1.187     schwarze 1660:                reg->val = 0;
1.180     schwarze 1661:                reg->next = r->regtab;
                   1662:                r->regtab = reg;
                   1663:        }
                   1664:
1.187     schwarze 1665:        if ('+' == sign)
                   1666:                reg->val += val;
                   1667:        else if ('-' == sign)
                   1668:                reg->val -= val;
                   1669:        else
                   1670:                reg->val = val;
1.147     kristaps 1671: }
                   1672:
1.192     schwarze 1673: /*
                   1674:  * Handle some predefined read-only number registers.
                   1675:  * For now, return -1 if the requested register is not predefined;
                   1676:  * in case a predefined read-only register having the value -1
                   1677:  * were to turn up, another special value would have to be chosen.
                   1678:  */
                   1679: static int
                   1680: roff_getregro(const char *name)
                   1681: {
                   1682:
                   1683:        switch (*name) {
1.207     schwarze 1684:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1685:                return(0);
1.207     schwarze 1686:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1687:                return(1);
1.207     schwarze 1688:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1689:                return (24);
1.207     schwarze 1690:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1691:                return(0);
1.207     schwarze 1692:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1693:                return(1);
1.207     schwarze 1694:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1695:                return (40);
                   1696:        default:
                   1697:                return (-1);
                   1698:        }
                   1699: }
                   1700:
1.181     schwarze 1701: int
1.180     schwarze 1702: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1703: {
1.180     schwarze 1704:        struct roffreg  *reg;
1.192     schwarze 1705:        int              val;
                   1706:
                   1707:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1708:                val = roff_getregro(name + 1);
                   1709:                if (-1 != val)
                   1710:                        return (val);
                   1711:        }
1.180     schwarze 1712:
                   1713:        for (reg = r->regtab; reg; reg = reg->next)
                   1714:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1715:                        return(reg->val);
                   1716:
                   1717:        return(0);
                   1718: }
                   1719:
                   1720: static int
                   1721: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1722: {
                   1723:        struct roffreg  *reg;
1.192     schwarze 1724:        int              val;
                   1725:
                   1726:        if ('.' == name[0] && 2 == len) {
                   1727:                val = roff_getregro(name + 1);
                   1728:                if (-1 != val)
                   1729:                        return (val);
                   1730:        }
1.181     schwarze 1731:
                   1732:        for (reg = r->regtab; reg; reg = reg->next)
                   1733:                if (len == reg->key.sz &&
                   1734:                    0 == strncmp(name, reg->key.p, len))
                   1735:                        return(reg->val);
1.147     kristaps 1736:
1.180     schwarze 1737:        return(0);
1.147     kristaps 1738: }
                   1739:
1.180     schwarze 1740: static void
                   1741: roff_freereg(struct roffreg *reg)
1.147     kristaps 1742: {
1.180     schwarze 1743:        struct roffreg  *old_reg;
1.147     kristaps 1744:
1.180     schwarze 1745:        while (NULL != reg) {
                   1746:                free(reg->key.p);
                   1747:                old_reg = reg;
                   1748:                reg = reg->next;
                   1749:                free(old_reg);
                   1750:        }
1.147     kristaps 1751: }
1.92      schwarze 1752:
                   1753: static enum rofferr
1.89      kristaps 1754: roff_nr(ROFF_ARGS)
1.83      schwarze 1755: {
1.212     schwarze 1756:        char            *key, *val;
                   1757:        size_t           keysz;
1.138     kristaps 1758:        int              iv;
1.187     schwarze 1759:        char             sign;
1.89      kristaps 1760:
1.238     schwarze 1761:        key = val = buf->buf + pos;
                   1762:        if (*key == '\0')
1.212     schwarze 1763:                return(ROFF_IGN);
                   1764:
                   1765:        keysz = roff_getname(r, &val, ln, pos);
1.238     schwarze 1766:        if (key[keysz] == '\\')
1.212     schwarze 1767:                return(ROFF_IGN);
                   1768:        key[keysz] = '\0';
1.89      kristaps 1769:
1.187     schwarze 1770:        sign = *val;
1.238     schwarze 1771:        if (sign == '+' || sign == '-')
1.187     schwarze 1772:                val++;
                   1773:
1.234     kristaps 1774:        if (roff_evalnum(r, ln, val, NULL, &iv, 0))
1.204     schwarze 1775:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1776:
1.203     schwarze 1777:        return(ROFF_IGN);
                   1778: }
                   1779:
                   1780: static enum rofferr
                   1781: roff_rr(ROFF_ARGS)
                   1782: {
                   1783:        struct roffreg  *reg, **prev;
1.212     schwarze 1784:        char            *name, *cp;
                   1785:        size_t           namesz;
1.203     schwarze 1786:
1.238     schwarze 1787:        name = cp = buf->buf + pos;
                   1788:        if (*name == '\0')
1.212     schwarze 1789:                return(ROFF_IGN);
                   1790:        namesz = roff_getname(r, &cp, ln, pos);
                   1791:        name[namesz] = '\0';
1.203     schwarze 1792:
                   1793:        prev = &r->regtab;
                   1794:        while (1) {
                   1795:                reg = *prev;
1.238     schwarze 1796:                if (reg == NULL || !strcmp(name, reg->key.p))
1.203     schwarze 1797:                        break;
                   1798:                prev = &reg->next;
                   1799:        }
1.238     schwarze 1800:        if (reg != NULL) {
1.203     schwarze 1801:                *prev = reg->next;
                   1802:                free(reg->key.p);
                   1803:                free(reg);
                   1804:        }
1.122     schwarze 1805:        return(ROFF_IGN);
                   1806: }
                   1807:
                   1808: static enum rofferr
                   1809: roff_rm(ROFF_ARGS)
                   1810: {
                   1811:        const char       *name;
                   1812:        char             *cp;
1.212     schwarze 1813:        size_t            namesz;
1.122     schwarze 1814:
1.238     schwarze 1815:        cp = buf->buf + pos;
                   1816:        while (*cp != '\0') {
1.212     schwarze 1817:                name = cp;
1.238     schwarze 1818:                namesz = roff_getname(r, &cp, ln, (int)(cp - buf->buf));
1.212     schwarze 1819:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
1.238     schwarze 1820:                if (name[namesz] == '\\')
1.212     schwarze 1821:                        break;
1.122     schwarze 1822:        }
1.178     schwarze 1823:        return(ROFF_IGN);
                   1824: }
                   1825:
                   1826: static enum rofferr
                   1827: roff_it(ROFF_ARGS)
                   1828: {
                   1829:        char            *cp;
                   1830:        size_t           len;
                   1831:        int              iv;
                   1832:
                   1833:        /* Parse the number of lines. */
1.238     schwarze 1834:        cp = buf->buf + pos;
1.178     schwarze 1835:        len = strcspn(cp, " \t");
                   1836:        cp[len] = '\0';
                   1837:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
1.222     schwarze 1838:                mandoc_msg(MANDOCERR_IT_NONUM, r->parse,
1.238     schwarze 1839:                    ln, ppos, buf->buf + 1);
1.178     schwarze 1840:                return(ROFF_IGN);
                   1841:        }
                   1842:        cp += len + 1;
                   1843:
                   1844:        /* Arm the input line trap. */
                   1845:        roffit_lines = iv;
                   1846:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1847:        return(ROFF_IGN);
1.175     schwarze 1848: }
                   1849:
                   1850: static enum rofferr
                   1851: roff_Dd(ROFF_ARGS)
                   1852: {
                   1853:        const char *const       *cp;
                   1854:
1.227     schwarze 1855:        if ((r->options & (MPARSE_MDOC | MPARSE_QUICK)) == 0)
1.175     schwarze 1856:                for (cp = __mdoc_reserved; *cp; cp++)
                   1857:                        roff_setstr(r, *cp, NULL, 0);
                   1858:
1.227     schwarze 1859:        if (r->format == 0)
                   1860:                r->format = MPARSE_MDOC;
                   1861:
1.175     schwarze 1862:        return(ROFF_CONT);
                   1863: }
                   1864:
                   1865: static enum rofferr
                   1866: roff_TH(ROFF_ARGS)
                   1867: {
                   1868:        const char *const       *cp;
                   1869:
1.227     schwarze 1870:        if ((r->options & MPARSE_QUICK) == 0)
1.175     schwarze 1871:                for (cp = __man_reserved; *cp; cp++)
                   1872:                        roff_setstr(r, *cp, NULL, 0);
                   1873:
1.227     schwarze 1874:        if (r->format == 0)
                   1875:                r->format = MPARSE_MAN;
                   1876:
1.175     schwarze 1877:        return(ROFF_CONT);
1.109     kristaps 1878: }
                   1879:
                   1880: static enum rofferr
                   1881: roff_TE(ROFF_ARGS)
                   1882: {
                   1883:
                   1884:        if (NULL == r->tbl)
1.221     schwarze 1885:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1886:                    ln, ppos, "TE");
1.115     kristaps 1887:        else
1.151     kristaps 1888:                tbl_end(&r->tbl);
1.109     kristaps 1889:
1.112     kristaps 1890:        return(ROFF_IGN);
                   1891: }
                   1892:
                   1893: static enum rofferr
                   1894: roff_T_(ROFF_ARGS)
                   1895: {
                   1896:
                   1897:        if (NULL == r->tbl)
1.221     schwarze 1898:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1899:                    ln, ppos, "T&");
1.112     kristaps 1900:        else
1.116     kristaps 1901:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1902:
1.109     kristaps 1903:        return(ROFF_IGN);
                   1904: }
                   1905:
1.230     schwarze 1906: /*
                   1907:  * Handle in-line equation delimiters.
                   1908:  */
                   1909: static enum rofferr
1.238     schwarze 1910: roff_eqndelim(struct roff *r, struct buf *buf, int pos)
1.151     kristaps 1911: {
1.233     schwarze 1912:        char            *cp1, *cp2;
                   1913:        const char      *bef_pr, *bef_nl, *mac, *aft_nl, *aft_pr;
1.151     kristaps 1914:
1.230     schwarze 1915:        /*
                   1916:         * Outside equations, look for an opening delimiter.
                   1917:         * If we are inside an equation, we already know it is
                   1918:         * in-line, or this function wouldn't have been called;
                   1919:         * so look for a closing delimiter.
                   1920:         */
                   1921:
1.238     schwarze 1922:        cp1 = buf->buf + pos;
1.230     schwarze 1923:        cp2 = strchr(cp1, r->eqn == NULL ?
                   1924:            r->last_eqn->odelim : r->last_eqn->cdelim);
                   1925:        if (cp2 == NULL)
                   1926:                return(ROFF_CONT);
                   1927:
1.233     schwarze 1928:        *cp2++ = '\0';
                   1929:        bef_pr = bef_nl = aft_nl = aft_pr = "";
                   1930:
                   1931:        /* Handle preceding text, protecting whitespace. */
                   1932:
1.238     schwarze 1933:        if (*buf->buf != '\0') {
1.233     schwarze 1934:                if (r->eqn == NULL)
                   1935:                        bef_pr = "\\&";
                   1936:                bef_nl = "\n";
                   1937:        }
                   1938:
                   1939:        /*
                   1940:         * Prepare replacing the delimiter with an equation macro
                   1941:         * and drop leading white space from the equation.
                   1942:         */
1.230     schwarze 1943:
1.233     schwarze 1944:        if (r->eqn == NULL) {
                   1945:                while (*cp2 == ' ')
                   1946:                        cp2++;
                   1947:                mac = ".EQ";
                   1948:        } else
                   1949:                mac = ".EN";
                   1950:
                   1951:        /* Handle following text, protecting whitespace. */
                   1952:
                   1953:        if (*cp2 != '\0') {
                   1954:                aft_nl = "\n";
                   1955:                if (r->eqn != NULL)
                   1956:                        aft_pr = "\\&";
                   1957:        }
                   1958:
                   1959:        /* Do the actual replacement. */
                   1960:
1.238     schwarze 1961:        buf->sz = mandoc_asprintf(&cp1, "%s%s%s%s%s%s%s", buf->buf,
1.233     schwarze 1962:            bef_pr, bef_nl, mac, aft_nl, aft_pr, cp2) + 1;
1.238     schwarze 1963:        free(buf->buf);
                   1964:        buf->buf = cp1;
1.230     schwarze 1965:
                   1966:        /* Toggle the in-line state of the eqn subsystem. */
                   1967:
                   1968:        r->eqn_inline = r->eqn == NULL;
                   1969:        return(ROFF_REPARSE);
1.151     kristaps 1970: }
                   1971:
1.235     schwarze 1972: static enum rofferr
                   1973: roff_EQ(ROFF_ARGS)
1.125     kristaps 1974: {
1.151     kristaps 1975:        struct eqn_node *e;
1.125     kristaps 1976:
1.238     schwarze 1977:        assert(r->eqn == NULL);
1.235     schwarze 1978:        e = eqn_alloc(ppos, ln, r->parse);
1.125     kristaps 1979:
1.230     schwarze 1980:        if (r->last_eqn) {
1.125     kristaps 1981:                r->last_eqn->next = e;
1.230     schwarze 1982:                e->delim = r->last_eqn->delim;
                   1983:                e->odelim = r->last_eqn->odelim;
                   1984:                e->cdelim = r->last_eqn->cdelim;
                   1985:        } else
1.125     kristaps 1986:                r->first_eqn = r->last_eqn = e;
                   1987:
                   1988:        r->eqn = r->last_eqn = e;
1.151     kristaps 1989:
1.238     schwarze 1990:        if (buf->buf[pos] != '\0')
1.235     schwarze 1991:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
1.238     schwarze 1992:                    ".EQ %s", buf->buf + pos);
1.151     kristaps 1993:
1.125     kristaps 1994:        return(ROFF_IGN);
                   1995: }
                   1996:
                   1997: static enum rofferr
                   1998: roff_EN(ROFF_ARGS)
                   1999: {
                   2000:
1.221     schwarze 2001:        mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse, ln, ppos, "EN");
1.125     kristaps 2002:        return(ROFF_IGN);
                   2003: }
                   2004:
                   2005: static enum rofferr
1.109     kristaps 2006: roff_TS(ROFF_ARGS)
                   2007: {
1.176     schwarze 2008:        struct tbl_node *tbl;
1.89      kristaps 2009:
1.115     kristaps 2010:        if (r->tbl) {
1.221     schwarze 2011:                mandoc_msg(MANDOCERR_BLK_BROKEN, r->parse,
                   2012:                    ln, ppos, "TS breaks TS");
1.151     kristaps 2013:                tbl_end(&r->tbl);
1.115     kristaps 2014:        }
1.83      schwarze 2015:
1.176     schwarze 2016:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 2017:
                   2018:        if (r->last_tbl)
1.176     schwarze 2019:                r->last_tbl->next = tbl;
1.113     kristaps 2020:        else
1.176     schwarze 2021:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 2022:
1.176     schwarze 2023:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 2024:        return(ROFF_IGN);
1.92      schwarze 2025: }
                   2026:
1.105     kristaps 2027: static enum rofferr
1.174     kristaps 2028: roff_cc(ROFF_ARGS)
                   2029: {
                   2030:        const char      *p;
                   2031:
1.238     schwarze 2032:        p = buf->buf + pos;
1.174     kristaps 2033:
1.238     schwarze 2034:        if (*p == '\0' || (r->control = *p++) == '.')
1.174     kristaps 2035:                r->control = 0;
                   2036:
1.238     schwarze 2037:        if (*p != '\0')
1.174     kristaps 2038:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2039:
                   2040:        return(ROFF_IGN);
                   2041: }
                   2042:
                   2043: static enum rofferr
1.164     kristaps 2044: roff_tr(ROFF_ARGS)
                   2045: {
                   2046:        const char      *p, *first, *second;
                   2047:        size_t           fsz, ssz;
                   2048:        enum mandoc_esc  esc;
                   2049:
1.238     schwarze 2050:        p = buf->buf + pos;
1.164     kristaps 2051:
1.238     schwarze 2052:        if (*p == '\0') {
1.164     kristaps 2053:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2054:                return(ROFF_IGN);
                   2055:        }
                   2056:
1.238     schwarze 2057:        while (*p != '\0') {
1.164     kristaps 2058:                fsz = ssz = 1;
                   2059:
                   2060:                first = p++;
1.238     schwarze 2061:                if (*first == '\\') {
1.164     kristaps 2062:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2063:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2064:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2065:                                    ln, (int)(p - buf->buf), first);
1.164     kristaps 2066:                                return(ROFF_IGN);
                   2067:                        }
                   2068:                        fsz = (size_t)(p - first);
                   2069:                }
                   2070:
                   2071:                second = p++;
1.238     schwarze 2072:                if (*second == '\\') {
1.164     kristaps 2073:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2074:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2075:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2076:                                    ln, (int)(p - buf->buf), second);
1.164     kristaps 2077:                                return(ROFF_IGN);
                   2078:                        }
                   2079:                        ssz = (size_t)(p - second);
1.238     schwarze 2080:                } else if (*second == '\0') {
1.207     schwarze 2081:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
1.238     schwarze 2082:                            ln, (int)(p - buf->buf), NULL);
1.164     kristaps 2083:                        second = " ";
1.165     kristaps 2084:                        p--;
1.164     kristaps 2085:                }
                   2086:
1.167     kristaps 2087:                if (fsz > 1) {
1.207     schwarze 2088:                        roff_setstrn(&r->xmbtab, first, fsz,
                   2089:                            second, ssz, 0);
1.167     kristaps 2090:                        continue;
                   2091:                }
                   2092:
1.238     schwarze 2093:                if (r->xtab == NULL)
1.207     schwarze 2094:                        r->xtab = mandoc_calloc(128,
                   2095:                            sizeof(struct roffstr));
1.167     kristaps 2096:
                   2097:                free(r->xtab[(int)*first].p);
                   2098:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   2099:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 2100:        }
                   2101:
                   2102:        return(ROFF_IGN);
                   2103: }
                   2104:
                   2105: static enum rofferr
1.105     kristaps 2106: roff_so(ROFF_ARGS)
                   2107: {
1.249     schwarze 2108:        char *name, *cp;
1.105     kristaps 2109:
1.238     schwarze 2110:        name = buf->buf + pos;
1.224     schwarze 2111:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, "so %s", name);
1.105     kristaps 2112:
                   2113:        /*
                   2114:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   2115:         * opening anything that's not in our cwd or anything beneath
                   2116:         * it.  Thus, explicitly disallow traversing up the file-system
                   2117:         * or using absolute paths.
                   2118:         */
                   2119:
1.238     schwarze 2120:        if (*name == '/' || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 2121:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   2122:                    ".so %s", name);
1.249     schwarze 2123:                buf->sz = mandoc_asprintf(&cp,
                   2124:                    ".sp\nSee the file %s.\n.sp", name) + 1;
                   2125:                free(buf->buf);
                   2126:                buf->buf = cp;
                   2127:                *offs = 0;
                   2128:                return(ROFF_REPARSE);
1.105     kristaps 2129:        }
                   2130:
                   2131:        *offs = pos;
                   2132:        return(ROFF_SO);
                   2133: }
1.92      schwarze 2134:
1.106     kristaps 2135: static enum rofferr
                   2136: roff_userdef(ROFF_ARGS)
1.99      kristaps 2137: {
1.106     kristaps 2138:        const char       *arg[9];
                   2139:        char             *cp, *n1, *n2;
1.119     schwarze 2140:        int               i;
1.106     kristaps 2141:
                   2142:        /*
                   2143:         * Collect pointers to macro argument strings
1.188     schwarze 2144:         * and NUL-terminate them.
1.106     kristaps 2145:         */
1.238     schwarze 2146:        cp = buf->buf + pos;
1.119     schwarze 2147:        for (i = 0; i < 9; i++)
1.238     schwarze 2148:                arg[i] = *cp == '\0' ? "" :
1.136     kristaps 2149:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 2150:
1.106     kristaps 2151:        /*
                   2152:         * Expand macro arguments.
1.99      kristaps 2153:         */
1.238     schwarze 2154:        buf->sz = 0;
1.106     kristaps 2155:        n1 = cp = mandoc_strdup(r->current_string);
1.238     schwarze 2156:        while ((cp = strstr(cp, "\\$")) != NULL) {
1.106     kristaps 2157:                i = cp[2] - '1';
                   2158:                if (0 > i || 8 < i) {
                   2159:                        /* Not an argument invocation. */
                   2160:                        cp += 2;
                   2161:                        continue;
                   2162:                }
1.209     schwarze 2163:                *cp = '\0';
1.238     schwarze 2164:                buf->sz = mandoc_asprintf(&n2, "%s%s%s",
1.209     schwarze 2165:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 2166:                cp = n2 + (cp - n1);
                   2167:                free(n1);
                   2168:                n1 = n2;
1.99      kristaps 2169:        }
                   2170:
1.106     kristaps 2171:        /*
                   2172:         * Replace the macro invocation
                   2173:         * by the expanded macro.
                   2174:         */
1.238     schwarze 2175:        free(buf->buf);
                   2176:        buf->buf = n1;
                   2177:        if (buf->sz == 0)
                   2178:                buf->sz = strlen(buf->buf) + 1;
1.248     schwarze 2179:        *offs = 0;
1.106     kristaps 2180:
1.238     schwarze 2181:        return(buf->sz > 1 && buf->buf[buf->sz - 2] == '\n' ?
1.106     kristaps 2182:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2183: }
1.121     schwarze 2184:
1.212     schwarze 2185: static size_t
1.121     schwarze 2186: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2187: {
                   2188:        char     *name, *cp;
1.212     schwarze 2189:        size_t    namesz;
1.121     schwarze 2190:
                   2191:        name = *cpp;
                   2192:        if ('\0' == *name)
1.212     schwarze 2193:                return(0);
1.121     schwarze 2194:
1.212     schwarze 2195:        /* Read until end of name and terminate it with NUL. */
                   2196:        for (cp = name; 1; cp++) {
                   2197:                if ('\0' == *cp || ' ' == *cp) {
                   2198:                        namesz = cp - name;
                   2199:                        break;
                   2200:                }
1.121     schwarze 2201:                if ('\\' != *cp)
                   2202:                        continue;
1.215     schwarze 2203:                namesz = cp - name;
                   2204:                if ('{' == cp[1] || '}' == cp[1])
                   2205:                        break;
1.121     schwarze 2206:                cp++;
                   2207:                if ('\\' == *cp)
                   2208:                        continue;
1.224     schwarze 2209:                mandoc_vmsg(MANDOCERR_NAMESC, r->parse, ln, pos,
                   2210:                    "%.*s", (int)(cp - name + 1), name);
1.212     schwarze 2211:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2212:                break;
1.121     schwarze 2213:        }
                   2214:
                   2215:        /* Read past spaces. */
                   2216:        while (' ' == *cp)
                   2217:                cp++;
                   2218:
                   2219:        *cpp = cp;
1.212     schwarze 2220:        return(namesz);
1.121     schwarze 2221: }
                   2222:
1.106     kristaps 2223: /*
                   2224:  * Store *string into the user-defined string called *name.
                   2225:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2226:  * append == 0: replace mode
                   2227:  * append == 1: single-line append mode
                   2228:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2229:  */
1.94      kristaps 2230: static void
1.106     kristaps 2231: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2232:        int append)
1.92      schwarze 2233: {
1.164     kristaps 2234:
                   2235:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2236:            string ? strlen(string) : 0, append);
1.164     kristaps 2237: }
                   2238:
                   2239: static void
1.166     kristaps 2240: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2241:                const char *string, size_t stringsz, int append)
1.164     kristaps 2242: {
1.166     kristaps 2243:        struct roffkv   *n;
1.164     kristaps 2244:        char            *c;
                   2245:        int              i;
                   2246:        size_t           oldch, newch;
1.92      schwarze 2247:
1.106     kristaps 2248:        /* Search for an existing string with the same name. */
1.164     kristaps 2249:        n = *r;
                   2250:
1.211     schwarze 2251:        while (n && (namesz != n->key.sz ||
                   2252:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2253:                n = n->next;
1.94      kristaps 2254:
                   2255:        if (NULL == n) {
1.106     kristaps 2256:                /* Create a new string table entry. */
1.166     kristaps 2257:                n = mandoc_malloc(sizeof(struct roffkv));
                   2258:                n->key.p = mandoc_strndup(name, namesz);
                   2259:                n->key.sz = namesz;
                   2260:                n->val.p = NULL;
                   2261:                n->val.sz = 0;
1.164     kristaps 2262:                n->next = *r;
                   2263:                *r = n;
1.193     schwarze 2264:        } else if (0 == append) {
1.166     kristaps 2265:                free(n->val.p);
                   2266:                n->val.p = NULL;
                   2267:                n->val.sz = 0;
1.106     kristaps 2268:        }
                   2269:
                   2270:        if (NULL == string)
                   2271:                return;
                   2272:
                   2273:        /*
                   2274:         * One additional byte for the '\n' in multiline mode,
                   2275:         * and one for the terminating '\0'.
                   2276:         */
1.193     schwarze 2277:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2278:
1.166     kristaps 2279:        if (NULL == n->val.p) {
                   2280:                n->val.p = mandoc_malloc(newch);
                   2281:                *n->val.p = '\0';
1.106     kristaps 2282:                oldch = 0;
                   2283:        } else {
1.166     kristaps 2284:                oldch = n->val.sz;
                   2285:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2286:        }
                   2287:
                   2288:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2289:        c = n->val.p + (int)oldch;
1.106     kristaps 2290:
                   2291:        /* Append new content to the destination buffer. */
1.164     kristaps 2292:        i = 0;
                   2293:        while (i < (int)stringsz) {
1.106     kristaps 2294:                /*
                   2295:                 * Rudimentary roff copy mode:
                   2296:                 * Handle escaped backslashes.
                   2297:                 */
1.164     kristaps 2298:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2299:                        i++;
                   2300:                *c++ = string[i++];
1.106     kristaps 2301:        }
1.94      kristaps 2302:
1.106     kristaps 2303:        /* Append terminating bytes. */
1.193     schwarze 2304:        if (1 < append)
1.106     kristaps 2305:                *c++ = '\n';
1.163     kristaps 2306:
1.106     kristaps 2307:        *c = '\0';
1.166     kristaps 2308:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2309: }
                   2310:
1.94      kristaps 2311: static const char *
                   2312: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2313: {
1.166     kristaps 2314:        const struct roffkv *n;
1.191     schwarze 2315:        int i;
1.92      schwarze 2316:
1.164     kristaps 2317:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2318:                if (0 == strncmp(name, n->key.p, len) &&
                   2319:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2320:                        return(n->val.p);
1.191     schwarze 2321:
                   2322:        for (i = 0; i < PREDEFS_MAX; i++)
                   2323:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2324:                                '\0' == predefs[i].name[(int)len])
                   2325:                        return(predefs[i].str);
1.94      kristaps 2326:
1.157     kristaps 2327:        return(NULL);
1.92      schwarze 2328: }
                   2329:
1.94      kristaps 2330: static void
1.167     kristaps 2331: roff_freestr(struct roffkv *r)
1.92      schwarze 2332: {
1.166     kristaps 2333:        struct roffkv    *n, *nn;
1.92      schwarze 2334:
1.167     kristaps 2335:        for (n = r; n; n = nn) {
1.166     kristaps 2336:                free(n->key.p);
                   2337:                free(n->val.p);
1.92      schwarze 2338:                nn = n->next;
                   2339:                free(n);
                   2340:        }
1.114     kristaps 2341: }
                   2342:
                   2343: const struct tbl_span *
                   2344: roff_span(const struct roff *r)
                   2345: {
1.207     schwarze 2346:
1.114     kristaps 2347:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2348: }
                   2349:
                   2350: const struct eqn *
                   2351: roff_eqn(const struct roff *r)
                   2352: {
1.207     schwarze 2353:
1.125     kristaps 2354:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2355: }
                   2356:
                   2357: /*
                   2358:  * Duplicate an input string, making the appropriate character
                   2359:  * conversations (as stipulated by `tr') along the way.
                   2360:  * Returns a heap-allocated string with all the replacements made.
                   2361:  */
                   2362: char *
                   2363: roff_strdup(const struct roff *r, const char *p)
                   2364: {
1.166     kristaps 2365:        const struct roffkv *cp;
1.164     kristaps 2366:        char            *res;
                   2367:        const char      *pp;
                   2368:        size_t           ssz, sz;
                   2369:        enum mandoc_esc  esc;
                   2370:
1.167     kristaps 2371:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2372:                return(mandoc_strdup(p));
                   2373:        else if ('\0' == *p)
                   2374:                return(mandoc_strdup(""));
                   2375:
                   2376:        /*
                   2377:         * Step through each character looking for term matches
                   2378:         * (remember that a `tr' can be invoked with an escape, which is
                   2379:         * a glyph but the escape is multi-character).
                   2380:         * We only do this if the character hash has been initialised
                   2381:         * and the string is >0 length.
                   2382:         */
                   2383:
                   2384:        res = NULL;
                   2385:        ssz = 0;
                   2386:
                   2387:        while ('\0' != *p) {
1.167     kristaps 2388:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2389:                        sz = r->xtab[(int)*p].sz;
                   2390:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2391:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2392:                        ssz += sz;
                   2393:                        p++;
                   2394:                        continue;
                   2395:                } else if ('\\' != *p) {
                   2396:                        res = mandoc_realloc(res, ssz + 2);
                   2397:                        res[ssz++] = *p++;
                   2398:                        continue;
                   2399:                }
                   2400:
1.164     kristaps 2401:                /* Search for term matches. */
1.167     kristaps 2402:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2403:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2404:                                break;
                   2405:
                   2406:                if (NULL != cp) {
                   2407:                        /*
                   2408:                         * A match has been found.
                   2409:                         * Append the match to the array and move
                   2410:                         * forward by its keysize.
                   2411:                         */
1.207     schwarze 2412:                        res = mandoc_realloc(res,
                   2413:                            ssz + cp->val.sz + 1);
1.166     kristaps 2414:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2415:                        ssz += cp->val.sz;
                   2416:                        p += (int)cp->key.sz;
1.164     kristaps 2417:                        continue;
                   2418:                }
                   2419:
1.167     kristaps 2420:                /*
                   2421:                 * Handle escapes carefully: we need to copy
                   2422:                 * over just the escape itself, or else we might
                   2423:                 * do replacements within the escape itself.
                   2424:                 * Make sure to pass along the bogus string.
                   2425:                 */
                   2426:                pp = p++;
                   2427:                esc = mandoc_escape(&p, NULL, NULL);
                   2428:                if (ESCAPE_ERROR == esc) {
                   2429:                        sz = strlen(pp);
1.164     kristaps 2430:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2431:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2432:                        break;
1.164     kristaps 2433:                }
1.207     schwarze 2434:                /*
                   2435:                 * We bail out on bad escapes.
1.167     kristaps 2436:                 * No need to warn: we already did so when
                   2437:                 * roff_res() was called.
                   2438:                 */
                   2439:                sz = (int)(p - pp);
                   2440:                res = mandoc_realloc(res, ssz + sz + 1);
                   2441:                memcpy(res + ssz, pp, sz);
                   2442:                ssz += sz;
1.164     kristaps 2443:        }
                   2444:
                   2445:        res[(int)ssz] = '\0';
                   2446:        return(res);
1.227     schwarze 2447: }
                   2448:
                   2449: int
                   2450: roff_getformat(const struct roff *r)
                   2451: {
                   2452:
                   2453:        return(r->format);
1.174     kristaps 2454: }
                   2455:
                   2456: /*
1.207     schwarze 2457:  * Find out whether a line is a macro line or not.
1.174     kristaps 2458:  * If it is, adjust the current position and return one; if it isn't,
                   2459:  * return zero and don't change the current position.
                   2460:  * If the control character has been set with `.cc', then let that grain
                   2461:  * precedence.
                   2462:  * This is slighly contrary to groff, where using the non-breaking
                   2463:  * control character when `cc' has been invoked will cause the
                   2464:  * non-breaking macro contents to be printed verbatim.
                   2465:  */
                   2466: int
                   2467: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2468: {
                   2469:        int             pos;
                   2470:
                   2471:        pos = *ppos;
                   2472:
                   2473:        if (0 != r->control && cp[pos] == r->control)
                   2474:                pos++;
                   2475:        else if (0 != r->control)
                   2476:                return(0);
                   2477:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2478:                pos += 2;
                   2479:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2480:                pos++;
                   2481:        else
                   2482:                return(0);
                   2483:
                   2484:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2485:                pos++;
                   2486:
                   2487:        *ppos = pos;
                   2488:        return(1);
1.74      kristaps 2489: }

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