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Annotation of mandoc/roff.c, Revision 1.245

1.245   ! schwarze    1: /*     $Id: roff.c,v 1.244 2014/12/18 17:43:41 schwarze Exp $ */
1.1       kristaps    2: /*
1.175     schwarze    3:  * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.190     schwarze    4:  * Copyright (c) 2010-2014 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,
1.76      kristaps   78:        ROFF_cblock,
1.106     kristaps   79:        ROFF_USERDEF,
1.67      kristaps   80:        ROFF_MAX
                     81: };
                     82:
1.147     kristaps   83: /*
1.167     kristaps   84:  * An incredibly-simple string buffer.
                     85:  */
1.94      kristaps   86: struct roffstr {
1.167     kristaps   87:        char            *p; /* nil-terminated buffer */
                     88:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   89: };
                     90:
                     91: /*
1.167     kristaps   92:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   93:  */
                     94: struct roffkv {
                     95:        struct roffstr   key;
                     96:        struct roffstr   val;
                     97:        struct roffkv   *next; /* next in list */
1.94      kristaps   98: };
                     99:
1.180     schwarze  100: /*
                    101:  * A single number register as part of a singly-linked list.
                    102:  */
                    103: struct roffreg {
                    104:        struct roffstr   key;
1.181     schwarze  105:        int              val;
1.180     schwarze  106:        struct roffreg  *next;
                    107: };
                    108:
1.67      kristaps  109: struct roff {
1.128     kristaps  110:        struct mparse   *parse; /* parse point */
1.237     schwarze  111:        const struct mchars *mchars; /* character table */
1.67      kristaps  112:        struct roffnode *last; /* leaf of stack */
1.223     schwarze  113:        int             *rstack; /* stack of inverted `ie' values */
1.180     schwarze  114:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  115:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  116:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    117:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  118:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  119:        struct tbl_node *first_tbl; /* first table parsed */
                    120:        struct tbl_node *last_tbl; /* last table parsed */
                    121:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  122:        struct eqn_node *last_eqn; /* last equation parsed */
                    123:        struct eqn_node *first_eqn; /* first equation parsed */
                    124:        struct eqn_node *eqn; /* current equation being parsed */
1.230     schwarze  125:        int              eqn_inline; /* current equation is inline */
1.223     schwarze  126:        int              options; /* parse options */
                    127:        int              rstacksz; /* current size limit of rstack */
                    128:        int              rstackpos; /* position in rstack */
1.227     schwarze  129:        int              format; /* current file in mdoc or man format */
1.223     schwarze  130:        char             control; /* control character */
1.79      kristaps  131: };
                    132:
1.67      kristaps  133: struct roffnode {
                    134:        enum rofft       tok; /* type of node */
                    135:        struct roffnode *parent; /* up one in stack */
                    136:        int              line; /* parse line */
                    137:        int              col; /* parse col */
1.106     kristaps  138:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  139:        char            *end; /* end-rules: custom token */
                    140:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  141:        int              rule; /* current evaluation rule */
1.67      kristaps  142: };
                    143:
                    144: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  145:                         enum rofft tok, /* tok of macro */ \
1.238     schwarze  146:                         struct buf *buf, /* input buffer */ \
1.67      kristaps  147:                         int ln, /* parse line */ \
1.75      kristaps  148:                         int ppos, /* original pos in buffer */ \
                    149:                         int pos, /* current pos in buffer */ \
1.74      kristaps  150:                         int *offs /* reset offset of buffer data */
1.67      kristaps  151:
                    152: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    153:
                    154: struct roffmac {
                    155:        const char      *name; /* macro name */
1.79      kristaps  156:        roffproc         proc; /* process new macro */
                    157:        roffproc         text; /* process as child text of macro */
                    158:        roffproc         sub; /* process as child of macro */
                    159:        int              flags;
                    160: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  161:        struct roffmac  *next;
1.67      kristaps  162: };
                    163:
1.141     kristaps  164: struct predef {
                    165:        const char      *name; /* predefined input name */
                    166:        const char      *str; /* replacement symbol */
                    167: };
                    168:
                    169: #define        PREDEF(__name, __str) \
                    170:        { (__name), (__str) },
                    171:
1.155     kristaps  172: static enum rofft       roffhash_find(const char *, size_t);
                    173: static void             roffhash_init(void);
                    174: static void             roffnode_cleanscope(struct roff *);
                    175: static void             roffnode_pop(struct roff *);
                    176: static void             roffnode_push(struct roff *, enum rofft,
                    177:                                const char *, int, int);
1.80      kristaps  178: static enum rofferr     roff_block(ROFF_ARGS);
                    179: static enum rofferr     roff_block_text(ROFF_ARGS);
                    180: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    181: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  182: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  183: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  184: static enum rofferr     roff_cond(ROFF_ARGS);
                    185: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    186: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  187: static enum rofferr     roff_ds(ROFF_ARGS);
1.238     schwarze  188: static enum rofferr     roff_eqndelim(struct roff *, struct buf *, int);
1.234     kristaps  189: static int              roff_evalcond(struct roff *r, int,
                    190:                                const char *, int *);
                    191: static int              roff_evalnum(struct roff *, int,
                    192:                                const char *, int *, int *, int);
                    193: static int              roff_evalpar(struct roff *, int,
                    194:                                const char *, int *, int *);
1.198     schwarze  195: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  196: static void             roff_free1(struct roff *);
1.180     schwarze  197: static void             roff_freereg(struct roffreg *);
1.167     kristaps  198: static void             roff_freestr(struct roffkv *);
1.212     schwarze  199: static size_t           roff_getname(struct roff *, char **, int, int);
1.184     schwarze  200: static int              roff_getnum(const char *, int *, int *);
                    201: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  202: static int              roff_getregn(const struct roff *,
                    203:                                const char *, size_t);
1.192     schwarze  204: static int              roff_getregro(const char *name);
1.207     schwarze  205: static const char      *roff_getstrn(const struct roff *,
1.94      kristaps  206:                                const char *, size_t);
1.178     schwarze  207: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  208: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  209: static enum rofferr     roff_nr(ROFF_ARGS);
1.214     schwarze  210: static enum rofft       roff_parse(struct roff *, char *, int *,
                    211:                                int, int);
1.238     schwarze  212: static enum rofferr     roff_parsetext(struct buf *, int, int *);
                    213: static enum rofferr     roff_res(struct roff *, struct buf *, int, int);
1.122     schwarze  214: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  215: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  216: static void             roff_setstr(struct roff *,
1.106     kristaps  217:                                const char *, const char *, int);
1.207     schwarze  218: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  219:                                size_t, const char *, size_t, int);
1.105     kristaps  220: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  221: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  222: static enum rofferr     roff_Dd(ROFF_ARGS);
                    223: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  224: static enum rofferr     roff_TE(ROFF_ARGS);
                    225: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  226: static enum rofferr     roff_EQ(ROFF_ARGS);
                    227: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  228: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  229: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  230:
1.155     kristaps  231: /* See roffhash_find() */
1.85      kristaps  232:
                    233: #define        ASCII_HI         126
                    234: #define        ASCII_LO         33
                    235: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    236:
                    237: static struct roffmac  *hash[HASHWIDTH];
                    238:
                    239: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  240:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  241:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    242:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    243:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  244:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  245:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  246:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  247:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    248:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    249:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  250:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  251:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  252:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  253:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  254:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  255:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    256:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    257:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  258:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  259:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    260:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  261:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  262:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
1.229     schwarze  263:        { "pl", roff_line_ignore, NULL, NULL, 0, NULL },
1.124     schwarze  264:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  265:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  266:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  267:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  268:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  269:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  270:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    271:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  272:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    273:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  274:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  275:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    276:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  277:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  278:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  279: };
                    280:
1.200     schwarze  281: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  282: const  char *const __mdoc_reserved[] = {
                    283:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    284:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    285:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    286:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  287:        "Dt", "Dv", "Dx", "D1",
                    288:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    289:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  290:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  291:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    292:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  293:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  294:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    295:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    296:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  297:        "Ss", "St", "Sx", "Sy",
                    298:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  299:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  300:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    301:        NULL
                    302: };
                    303:
1.200     schwarze  304: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  305: const  char *const __man_reserved[] = {
1.200     schwarze  306:        "AT", "B", "BI", "BR", "DT",
                    307:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    308:        "LP", "OP", "P", "PD", "PP",
                    309:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    310:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  311:        NULL
                    312: };
                    313:
1.141     kristaps  314: /* Array of injected predefined strings. */
                    315: #define        PREDEFS_MAX      38
                    316: static const struct predef predefs[PREDEFS_MAX] = {
                    317: #include "predefs.in"
                    318: };
                    319:
1.155     kristaps  320: /* See roffhash_find() */
1.85      kristaps  321: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    322:
1.178     schwarze  323: static int      roffit_lines;  /* number of lines to delay */
                    324: static char    *roffit_macro;  /* nil-terminated macro line */
                    325:
1.207     schwarze  326:
1.85      kristaps  327: static void
1.155     kristaps  328: roffhash_init(void)
1.85      kristaps  329: {
                    330:        struct roffmac   *n;
                    331:        int               buc, i;
                    332:
1.106     kristaps  333:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  334:                assert(roffs[i].name[0] >= ASCII_LO);
                    335:                assert(roffs[i].name[0] <= ASCII_HI);
                    336:
                    337:                buc = ROFF_HASH(roffs[i].name);
                    338:
                    339:                if (NULL != (n = hash[buc])) {
                    340:                        for ( ; n->next; n = n->next)
                    341:                                /* Do nothing. */ ;
                    342:                        n->next = &roffs[i];
                    343:                } else
                    344:                        hash[buc] = &roffs[i];
                    345:        }
                    346: }
                    347:
1.67      kristaps  348: /*
                    349:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    350:  * the nil-terminated string name could be found.
                    351:  */
                    352: static enum rofft
1.155     kristaps  353: roffhash_find(const char *p, size_t s)
1.67      kristaps  354: {
1.85      kristaps  355:        int              buc;
                    356:        struct roffmac  *n;
1.67      kristaps  357:
1.85      kristaps  358:        /*
                    359:         * libroff has an extremely simple hashtable, for the time
                    360:         * being, which simply keys on the first character, which must
                    361:         * be printable, then walks a chain.  It works well enough until
                    362:         * optimised.
                    363:         */
                    364:
                    365:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    366:                return(ROFF_MAX);
                    367:
                    368:        buc = ROFF_HASH(p);
                    369:
                    370:        if (NULL == (n = hash[buc]))
                    371:                return(ROFF_MAX);
                    372:        for ( ; n; n = n->next)
1.106     kristaps  373:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  374:                        return((enum rofft)(n - roffs));
1.67      kristaps  375:
                    376:        return(ROFF_MAX);
                    377: }
                    378:
                    379: /*
                    380:  * Pop the current node off of the stack of roff instructions currently
                    381:  * pending.
                    382:  */
                    383: static void
                    384: roffnode_pop(struct roff *r)
                    385: {
                    386:        struct roffnode *p;
                    387:
1.75      kristaps  388:        assert(r->last);
1.207     schwarze  389:        p = r->last;
1.82      kristaps  390:
1.75      kristaps  391:        r->last = r->last->parent;
1.106     kristaps  392:        free(p->name);
                    393:        free(p->end);
1.67      kristaps  394:        free(p);
                    395: }
                    396:
                    397: /*
                    398:  * Push a roff node onto the instruction stack.  This must later be
                    399:  * removed with roffnode_pop().
                    400:  */
1.98      schwarze  401: static void
1.106     kristaps  402: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    403:                int line, int col)
1.67      kristaps  404: {
                    405:        struct roffnode *p;
                    406:
1.98      schwarze  407:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  408:        p->tok = tok;
1.106     kristaps  409:        if (name)
                    410:                p->name = mandoc_strdup(name);
1.67      kristaps  411:        p->parent = r->last;
                    412:        p->line = line;
                    413:        p->col = col;
1.198     schwarze  414:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  415:
                    416:        r->last = p;
                    417: }
                    418:
                    419: static void
                    420: roff_free1(struct roff *r)
                    421: {
1.176     schwarze  422:        struct tbl_node *tbl;
1.125     kristaps  423:        struct eqn_node *e;
1.167     kristaps  424:        int              i;
1.67      kristaps  425:
1.176     schwarze  426:        while (NULL != (tbl = r->first_tbl)) {
                    427:                r->first_tbl = tbl->next;
                    428:                tbl_free(tbl);
1.109     kristaps  429:        }
1.113     kristaps  430:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    431:
1.125     kristaps  432:        while (NULL != (e = r->first_eqn)) {
                    433:                r->first_eqn = e->next;
                    434:                eqn_free(e);
                    435:        }
                    436:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    437:
1.67      kristaps  438:        while (r->last)
                    439:                roffnode_pop(r);
1.109     kristaps  440:
1.223     schwarze  441:        free (r->rstack);
                    442:        r->rstack = NULL;
                    443:        r->rstacksz = 0;
                    444:        r->rstackpos = -1;
                    445:
                    446:        roff_freereg(r->regtab);
                    447:        r->regtab = NULL;
                    448:
1.167     kristaps  449:        roff_freestr(r->strtab);
                    450:        roff_freestr(r->xmbtab);
                    451:        r->strtab = r->xmbtab = NULL;
                    452:
                    453:        if (r->xtab)
                    454:                for (i = 0; i < 128; i++)
                    455:                        free(r->xtab[i].p);
                    456:        free(r->xtab);
                    457:        r->xtab = NULL;
1.67      kristaps  458: }
                    459:
                    460: void
                    461: roff_reset(struct roff *r)
                    462: {
                    463:
                    464:        roff_free1(r);
1.227     schwarze  465:        r->format = r->options & (MPARSE_MDOC | MPARSE_MAN);
1.174     kristaps  466:        r->control = 0;
1.67      kristaps  467: }
                    468:
                    469: void
                    470: roff_free(struct roff *r)
                    471: {
                    472:
                    473:        roff_free1(r);
                    474:        free(r);
                    475: }
                    476:
                    477: struct roff *
1.237     schwarze  478: roff_alloc(struct mparse *parse, const struct mchars *mchars, int options)
1.67      kristaps  479: {
                    480:        struct roff     *r;
                    481:
1.98      schwarze  482:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  483:        r->parse = parse;
1.237     schwarze  484:        r->mchars = mchars;
1.199     schwarze  485:        r->options = options;
1.227     schwarze  486:        r->format = options & (MPARSE_MDOC | MPARSE_MAN);
1.82      kristaps  487:        r->rstackpos = -1;
1.207     schwarze  488:
1.155     kristaps  489:        roffhash_init();
1.141     kristaps  490:
1.67      kristaps  491:        return(r);
                    492: }
                    493:
1.94      kristaps  494: /*
1.206     schwarze  495:  * In the current line, expand escape sequences that tend to get
                    496:  * used in numerical expressions and conditional requests.
                    497:  * Also check the syntax of the remaining escape sequences.
1.154     kristaps  498:  */
1.172     schwarze  499: static enum rofferr
1.238     schwarze  500: roff_res(struct roff *r, struct buf *buf, int ln, int pos)
1.94      kristaps  501: {
1.208     schwarze  502:        char             ubuf[24]; /* buffer to print the number */
1.205     schwarze  503:        const char      *start; /* start of the string to process */
1.209     schwarze  504:        char            *stesc; /* start of an escape sequence ('\\') */
1.108     schwarze  505:        const char      *stnam; /* start of the name, after "[(*" */
                    506:        const char      *cp;    /* end of the name, e.g. before ']' */
                    507:        const char      *res;   /* the string to be substituted */
1.238     schwarze  508:        char            *nbuf;  /* new buffer to copy buf->buf to */
1.181     schwarze  509:        size_t           maxl;  /* expected length of the escape name */
                    510:        size_t           naml;  /* actual length of the escape name */
1.237     schwarze  511:        enum mandoc_esc  esc;   /* type of the escape sequence */
                    512:        int              inaml; /* length returned from mandoc_escape() */
1.181     schwarze  513:        int              expand_count;  /* to avoid infinite loops */
1.206     schwarze  514:        int              npos;  /* position in numeric expression */
1.218     schwarze  515:        int              arg_complete; /* argument not interrupted by eol */
1.206     schwarze  516:        char             term;  /* character terminating the escape */
1.94      kristaps  517:
1.170     schwarze  518:        expand_count = 0;
1.238     schwarze  519:        start = buf->buf + pos;
1.205     schwarze  520:        stesc = strchr(start, '\0') - 1;
                    521:        while (stesc-- > start) {
1.170     schwarze  522:
1.205     schwarze  523:                /* Search backwards for the next backslash. */
                    524:
1.238     schwarze  525:                if (*stesc != '\\')
1.205     schwarze  526:                        continue;
                    527:
                    528:                /* If it is escaped, skip it. */
                    529:
                    530:                for (cp = stesc - 1; cp >= start; cp--)
1.238     schwarze  531:                        if (*cp != '\\')
1.205     schwarze  532:                                break;
                    533:
1.238     schwarze  534:                if ((stesc - cp) % 2 == 0) {
1.209     schwarze  535:                        stesc = (char *)cp;
1.205     schwarze  536:                        continue;
                    537:                }
1.108     schwarze  538:
1.206     schwarze  539:                /* Decide whether to expand or to check only. */
1.108     schwarze  540:
1.206     schwarze  541:                term = '\0';
1.205     schwarze  542:                cp = stesc + 1;
1.181     schwarze  543:                switch (*cp) {
1.207     schwarze  544:                case '*':
1.181     schwarze  545:                        res = NULL;
                    546:                        break;
1.207     schwarze  547:                case 'B':
1.206     schwarze  548:                        /* FALLTHROUGH */
1.207     schwarze  549:                case 'w':
1.206     schwarze  550:                        term = cp[1];
                    551:                        /* FALLTHROUGH */
1.207     schwarze  552:                case 'n':
1.181     schwarze  553:                        res = ubuf;
                    554:                        break;
                    555:                default:
1.237     schwarze  556:                        esc = mandoc_escape(&cp, &stnam, &inaml);
                    557:                        if (esc == ESCAPE_ERROR ||
                    558:                            (esc == ESCAPE_SPECIAL &&
                    559:                             mchars_spec2cp(r->mchars, stnam, inaml) < 0))
1.219     schwarze  560:                                mandoc_vmsg(MANDOCERR_ESC_BAD,
1.238     schwarze  561:                                    r->parse, ln, (int)(stesc - buf->buf),
1.219     schwarze  562:                                    "%.*s", (int)(cp - stesc), stesc);
1.205     schwarze  563:                        continue;
1.152     kristaps  564:                }
                    565:
1.205     schwarze  566:                if (EXPAND_LIMIT < ++expand_count) {
                    567:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
1.238     schwarze  568:                            ln, (int)(stesc - buf->buf), NULL);
1.205     schwarze  569:                        return(ROFF_IGN);
                    570:                }
1.108     schwarze  571:
                    572:                /*
                    573:                 * The third character decides the length
1.181     schwarze  574:                 * of the name of the string or register.
1.108     schwarze  575:                 * Save a pointer to the name.
                    576:                 */
                    577:
1.238     schwarze  578:                if (term == '\0') {
1.206     schwarze  579:                        switch (*++cp) {
1.207     schwarze  580:                        case '\0':
1.206     schwarze  581:                                maxl = 0;
                    582:                                break;
1.207     schwarze  583:                        case '(':
1.206     schwarze  584:                                cp++;
                    585:                                maxl = 2;
                    586:                                break;
1.207     schwarze  587:                        case '[':
1.206     schwarze  588:                                cp++;
                    589:                                term = ']';
                    590:                                maxl = 0;
                    591:                                break;
                    592:                        default:
                    593:                                maxl = 1;
                    594:                                break;
                    595:                        }
                    596:                } else {
                    597:                        cp += 2;
1.94      kristaps  598:                        maxl = 0;
                    599:                }
1.108     schwarze  600:                stnam = cp;
1.94      kristaps  601:
1.108     schwarze  602:                /* Advance to the end of the name. */
1.94      kristaps  603:
1.218     schwarze  604:                arg_complete = 1;
1.238     schwarze  605:                for (naml = 0; maxl == 0 || naml < maxl; naml++, cp++) {
                    606:                        if (*cp == '\0') {
1.219     schwarze  607:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze  608:                                    ln, (int)(stesc - buf->buf), stesc);
1.218     schwarze  609:                                arg_complete = 0;
1.206     schwarze  610:                                break;
1.153     kristaps  611:                        }
1.238     schwarze  612:                        if (maxl == 0 && *cp == term) {
1.206     schwarze  613:                                cp++;
1.94      kristaps  614:                                break;
1.206     schwarze  615:                        }
1.94      kristaps  616:                }
                    617:
1.108     schwarze  618:                /*
                    619:                 * Retrieve the replacement string; if it is
                    620:                 * undefined, resume searching for escapes.
                    621:                 */
                    622:
1.206     schwarze  623:                switch (stesc[1]) {
1.207     schwarze  624:                case '*':
1.218     schwarze  625:                        if (arg_complete)
                    626:                                res = roff_getstrn(r, stnam, naml);
1.206     schwarze  627:                        break;
1.207     schwarze  628:                case 'B':
1.206     schwarze  629:                        npos = 0;
1.218     schwarze  630:                        ubuf[0] = arg_complete &&
1.234     kristaps  631:                            roff_evalnum(r, ln, stnam, &npos, NULL, 0) &&
1.218     schwarze  632:                            stnam + npos + 1 == cp ? '1' : '0';
1.206     schwarze  633:                        ubuf[1] = '\0';
                    634:                        break;
1.207     schwarze  635:                case 'n':
1.218     schwarze  636:                        if (arg_complete)
                    637:                                (void)snprintf(ubuf, sizeof(ubuf), "%d",
                    638:                                    roff_getregn(r, stnam, naml));
                    639:                        else
                    640:                                ubuf[0] = '\0';
1.206     schwarze  641:                        break;
1.207     schwarze  642:                case 'w':
1.218     schwarze  643:                        /* use even incomplete args */
1.208     schwarze  644:                        (void)snprintf(ubuf, sizeof(ubuf), "%d",
1.206     schwarze  645:                            24 * (int)naml);
                    646:                        break;
                    647:                }
1.94      kristaps  648:
1.238     schwarze  649:                if (res == NULL) {
1.219     schwarze  650:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze  651:                            r->parse, ln, (int)(stesc - buf->buf),
1.219     schwarze  652:                            "%.*s", (int)naml, stnam);
1.142     kristaps  653:                        res = "";
1.94      kristaps  654:                }
                    655:
1.108     schwarze  656:                /* Replace the escape sequence by the string. */
                    657:
1.209     schwarze  658:                *stesc = '\0';
1.238     schwarze  659:                buf->sz = mandoc_asprintf(&nbuf, "%s%s%s",
                    660:                    buf->buf, res, cp) + 1;
1.245   ! schwarze  661:
        !           662:                if (buf->sz > SHRT_MAX) {
        !           663:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
        !           664:                            ln, (int)(stesc - buf->buf), NULL);
        !           665:                        return(ROFF_IGN);
        !           666:                }
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:                }
                   1168:                ++ep;
1.177     schwarze 1169:        }
1.198     schwarze 1170:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1171: }
                   1172:
                   1173: static enum rofferr
                   1174: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1175: {
1.140     kristaps 1176:        char            *ep;
1.198     schwarze 1177:        int              rr;
1.82      kristaps 1178:
                   1179:        rr = r->last->rule;
1.140     kristaps 1180:        roffnode_cleanscope(r);
1.82      kristaps 1181:
1.238     schwarze 1182:        ep = buf->buf + pos;
                   1183:        while ((ep = strchr(ep, '\\')) != NULL) {
                   1184:                if (*(++ep) == '}') {
1.197     schwarze 1185:                        *ep = '&';
1.238     schwarze 1186:                        roff_ccond(r, ln, ep - buf->buf - 1);
1.197     schwarze 1187:                }
                   1188:                ++ep;
1.78      kristaps 1189:        }
1.198     schwarze 1190:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1191: }
                   1192:
1.204     schwarze 1193: /*
                   1194:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1195:  * If there is at least one digit, return success and advance the
                   1196:  * parse point, else return failure and let the parse point unchanged.
                   1197:  * Ignore overflows, treat them just like the C language.
                   1198:  */
1.184     schwarze 1199: static int
                   1200: roff_getnum(const char *v, int *pos, int *res)
                   1201: {
1.206     schwarze 1202:        int      myres, n, p;
                   1203:
                   1204:        if (NULL == res)
                   1205:                res = &myres;
1.184     schwarze 1206:
                   1207:        p = *pos;
                   1208:        n = v[p] == '-';
                   1209:        if (n)
                   1210:                p++;
                   1211:
                   1212:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1213:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1214:        if (p == *pos + n)
                   1215:                return 0;
                   1216:
                   1217:        if (n)
                   1218:                *res = -*res;
                   1219:
                   1220:        *pos = p;
                   1221:        return 1;
                   1222: }
                   1223:
1.198     schwarze 1224: /*
                   1225:  * Evaluate a string comparison condition.
                   1226:  * The first character is the delimiter.
                   1227:  * Succeed if the string up to its second occurrence
                   1228:  * matches the string up to its third occurence.
                   1229:  * Advance the cursor after the third occurrence
                   1230:  * or lacking that, to the end of the line.
                   1231:  */
                   1232: static int
                   1233: roff_evalstrcond(const char *v, int *pos)
                   1234: {
                   1235:        const char      *s1, *s2, *s3;
                   1236:        int              match;
                   1237:
                   1238:        match = 0;
                   1239:        s1 = v + *pos;          /* initial delimiter */
                   1240:        s2 = s1 + 1;            /* for scanning the first string */
                   1241:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1242:
                   1243:        if (NULL == s3)         /* found no middle delimiter */
                   1244:                goto out;
                   1245:
                   1246:        while ('\0' != *++s3) {
                   1247:                if (*s2 != *s3) {  /* mismatch */
                   1248:                        s3 = strchr(s3, *s1);
                   1249:                        break;
                   1250:                }
                   1251:                if (*s3 == *s1) {  /* found the final delimiter */
                   1252:                        match = 1;
                   1253:                        break;
                   1254:                }
                   1255:                s2++;
                   1256:        }
                   1257:
                   1258: out:
                   1259:        if (NULL == s3)
                   1260:                s3 = strchr(s2, '\0');
1.242     schwarze 1261:        else if (*s3 != '\0')
1.198     schwarze 1262:                s3++;
                   1263:        *pos = s3 - v;
                   1264:        return(match);
                   1265: }
                   1266:
1.204     schwarze 1267: /*
                   1268:  * Evaluate an optionally negated single character, numerical,
                   1269:  * or string condition.
                   1270:  */
1.198     schwarze 1271: static int
1.234     kristaps 1272: roff_evalcond(struct roff *r, int ln, const char *v, int *pos)
1.88      kristaps 1273: {
1.241     schwarze 1274:        int      number, savepos, wanttrue;
1.88      kristaps 1275:
1.198     schwarze 1276:        if ('!' == v[*pos]) {
                   1277:                wanttrue = 0;
                   1278:                (*pos)++;
                   1279:        } else
                   1280:                wanttrue = 1;
                   1281:
1.88      kristaps 1282:        switch (v[*pos]) {
1.240     schwarze 1283:        case '\0':
                   1284:                return(0);
1.207     schwarze 1285:        case 'n':
1.198     schwarze 1286:                /* FALLTHROUGH */
1.207     schwarze 1287:        case 'o':
1.88      kristaps 1288:                (*pos)++;
1.198     schwarze 1289:                return(wanttrue);
1.207     schwarze 1290:        case 'c':
1.198     schwarze 1291:                /* FALLTHROUGH */
1.207     schwarze 1292:        case 'd':
1.198     schwarze 1293:                /* FALLTHROUGH */
1.207     schwarze 1294:        case 'e':
1.88      kristaps 1295:                /* FALLTHROUGH */
1.207     schwarze 1296:        case 'r':
1.88      kristaps 1297:                /* FALLTHROUGH */
1.207     schwarze 1298:        case 't':
1.239     schwarze 1299:                /* FALLTHROUGH */
                   1300:        case 'v':
1.88      kristaps 1301:                (*pos)++;
1.198     schwarze 1302:                return(!wanttrue);
1.88      kristaps 1303:        default:
                   1304:                break;
                   1305:        }
                   1306:
1.241     schwarze 1307:        savepos = *pos;
1.234     kristaps 1308:        if (roff_evalnum(r, ln, v, pos, &number, 0))
1.204     schwarze 1309:                return((number > 0) == wanttrue);
1.241     schwarze 1310:        else if (*pos == savepos)
                   1311:                return(roff_evalstrcond(v, pos) == wanttrue);
1.204     schwarze 1312:        else
1.241     schwarze 1313:                return (0);
1.88      kristaps 1314: }
                   1315:
1.74      kristaps 1316: static enum rofferr
1.103     kristaps 1317: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1318: {
1.123     schwarze 1319:
1.89      kristaps 1320:        return(ROFF_IGN);
                   1321: }
                   1322:
1.104     kristaps 1323: static enum rofferr
1.82      kristaps 1324: roff_cond(ROFF_ARGS)
1.74      kristaps 1325: {
1.173     schwarze 1326:
                   1327:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1328:
1.207     schwarze 1329:        /*
1.134     kristaps 1330:         * An `.el' has no conditional body: it will consume the value
                   1331:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1332:         * defaults to DENY.
1.134     kristaps 1333:         *
                   1334:         * If we're not an `el', however, then evaluate the conditional.
                   1335:         */
1.133     kristaps 1336:
1.238     schwarze 1337:        r->last->rule = tok == ROFF_el ?
1.207     schwarze 1338:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
1.238     schwarze 1339:            roff_evalcond(r, ln, buf->buf, &pos);
1.77      kristaps 1340:
1.134     kristaps 1341:        /*
                   1342:         * An if-else will put the NEGATION of the current evaluated
                   1343:         * conditional into the stack of rules.
                   1344:         */
                   1345:
1.238     schwarze 1346:        if (tok == ROFF_ie) {
1.223     schwarze 1347:                if (r->rstackpos + 1 == r->rstacksz) {
                   1348:                        r->rstacksz += 16;
                   1349:                        r->rstack = mandoc_reallocarray(r->rstack,
                   1350:                            r->rstacksz, sizeof(int));
1.134     kristaps 1351:                }
1.198     schwarze 1352:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1353:        }
1.88      kristaps 1354:
                   1355:        /* If the parent has false as its rule, then so do we. */
                   1356:
1.198     schwarze 1357:        if (r->last->parent && !r->last->parent->rule)
                   1358:                r->last->rule = 0;
1.88      kristaps 1359:
                   1360:        /*
1.173     schwarze 1361:         * Determine scope.
                   1362:         * If there is nothing on the line after the conditional,
                   1363:         * not even whitespace, use next-line scope.
1.88      kristaps 1364:         */
1.74      kristaps 1365:
1.238     schwarze 1366:        if (buf->buf[pos] == '\0') {
1.173     schwarze 1367:                r->last->endspan = 2;
                   1368:                goto out;
                   1369:        }
                   1370:
1.238     schwarze 1371:        while (buf->buf[pos] == ' ')
1.173     schwarze 1372:                pos++;
                   1373:
                   1374:        /* An opening brace requests multiline scope. */
1.75      kristaps 1375:
1.238     schwarze 1376:        if (buf->buf[pos] == '\\' && buf->buf[pos + 1] == '{') {
1.75      kristaps 1377:                r->last->endspan = -1;
                   1378:                pos += 2;
1.173     schwarze 1379:                goto out;
1.207     schwarze 1380:        }
1.74      kristaps 1381:
1.77      kristaps 1382:        /*
1.173     schwarze 1383:         * Anything else following the conditional causes
                   1384:         * single-line scope.  Warn if the scope contains
                   1385:         * nothing but trailing whitespace.
1.77      kristaps 1386:         */
                   1387:
1.238     schwarze 1388:        if (buf->buf[pos] == '\0')
1.216     schwarze 1389:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1390:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1391:
1.173     schwarze 1392:        r->last->endspan = 1;
1.74      kristaps 1393:
1.173     schwarze 1394: out:
1.75      kristaps 1395:        *offs = pos;
                   1396:        return(ROFF_RERUN);
1.83      schwarze 1397: }
                   1398:
                   1399: static enum rofferr
1.92      schwarze 1400: roff_ds(ROFF_ARGS)
                   1401: {
1.212     schwarze 1402:        char            *string;
                   1403:        const char      *name;
                   1404:        size_t           namesz;
1.96      kristaps 1405:
                   1406:        /*
1.212     schwarze 1407:         * The first word is the name of the string.
                   1408:         * If it is empty or terminated by an escape sequence,
                   1409:         * abort the `ds' request without defining anything.
1.96      kristaps 1410:         */
1.92      schwarze 1411:
1.238     schwarze 1412:        name = string = buf->buf + pos;
                   1413:        if (*name == '\0')
1.92      schwarze 1414:                return(ROFF_IGN);
                   1415:
1.212     schwarze 1416:        namesz = roff_getname(r, &string, ln, pos);
1.238     schwarze 1417:        if (name[namesz] == '\\')
1.212     schwarze 1418:                return(ROFF_IGN);
                   1419:
                   1420:        /* Read past the initial double-quote, if any. */
1.238     schwarze 1421:        if (*string == '"')
1.92      schwarze 1422:                string++;
                   1423:
1.96      kristaps 1424:        /* The rest is the value. */
1.212     schwarze 1425:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1426:            ROFF_as == tok);
1.92      schwarze 1427:        return(ROFF_IGN);
                   1428: }
                   1429:
1.204     schwarze 1430: /*
                   1431:  * Parse a single operator, one or two characters long.
                   1432:  * If the operator is recognized, return success and advance the
                   1433:  * parse point, else return failure and let the parse point unchanged.
                   1434:  */
                   1435: static int
                   1436: roff_getop(const char *v, int *pos, char *res)
                   1437: {
                   1438:
                   1439:        *res = v[*pos];
                   1440:
                   1441:        switch (*res) {
1.207     schwarze 1442:        case '+':
1.204     schwarze 1443:                /* FALLTHROUGH */
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:                break;
                   1456:        case '<':
                   1457:                switch (v[*pos + 1]) {
1.207     schwarze 1458:                case '=':
1.204     schwarze 1459:                        *res = 'l';
                   1460:                        (*pos)++;
                   1461:                        break;
1.207     schwarze 1462:                case '>':
1.204     schwarze 1463:                        *res = '!';
                   1464:                        (*pos)++;
                   1465:                        break;
1.207     schwarze 1466:                case '?':
1.204     schwarze 1467:                        *res = 'i';
                   1468:                        (*pos)++;
                   1469:                        break;
                   1470:                default:
                   1471:                        break;
                   1472:                }
                   1473:                break;
                   1474:        case '>':
                   1475:                switch (v[*pos + 1]) {
1.207     schwarze 1476:                case '=':
1.204     schwarze 1477:                        *res = 'g';
                   1478:                        (*pos)++;
                   1479:                        break;
1.207     schwarze 1480:                case '?':
1.204     schwarze 1481:                        *res = 'a';
                   1482:                        (*pos)++;
                   1483:                        break;
                   1484:                default:
                   1485:                        break;
                   1486:                }
                   1487:                break;
                   1488:        case '=':
                   1489:                if ('=' == v[*pos + 1])
                   1490:                        (*pos)++;
                   1491:                break;
                   1492:        default:
                   1493:                return(0);
                   1494:        }
                   1495:        (*pos)++;
                   1496:
                   1497:        return(*res);
                   1498: }
                   1499:
                   1500: /*
                   1501:  * Evaluate either a parenthesized numeric expression
                   1502:  * or a single signed integer number.
                   1503:  */
                   1504: static int
1.235     schwarze 1505: roff_evalpar(struct roff *r, int ln,
1.234     kristaps 1506:        const char *v, int *pos, int *res)
1.204     schwarze 1507: {
                   1508:
                   1509:        if ('(' != v[*pos])
                   1510:                return(roff_getnum(v, pos, res));
                   1511:
                   1512:        (*pos)++;
1.234     kristaps 1513:        if ( ! roff_evalnum(r, ln, v, pos, res, 1))
1.204     schwarze 1514:                return(0);
                   1515:
1.206     schwarze 1516:        /*
                   1517:         * Omission of the closing parenthesis
                   1518:         * is an error in validation mode,
                   1519:         * but ignored in evaluation mode.
                   1520:         */
                   1521:
1.204     schwarze 1522:        if (')' == v[*pos])
                   1523:                (*pos)++;
1.206     schwarze 1524:        else if (NULL == res)
                   1525:                return(0);
1.204     schwarze 1526:
                   1527:        return(1);
                   1528: }
                   1529:
                   1530: /*
                   1531:  * Evaluate a complete numeric expression.
                   1532:  * Proceed left to right, there is no concept of precedence.
                   1533:  */
                   1534: static int
1.235     schwarze 1535: roff_evalnum(struct roff *r, int ln, const char *v,
1.234     kristaps 1536:        int *pos, int *res, int skipwhite)
1.204     schwarze 1537: {
                   1538:        int              mypos, operand2;
                   1539:        char             operator;
                   1540:
                   1541:        if (NULL == pos) {
                   1542:                mypos = 0;
                   1543:                pos = &mypos;
                   1544:        }
                   1545:
                   1546:        if (skipwhite)
                   1547:                while (isspace((unsigned char)v[*pos]))
                   1548:                        (*pos)++;
                   1549:
1.234     kristaps 1550:        if ( ! roff_evalpar(r, ln, v, pos, res))
1.204     schwarze 1551:                return(0);
                   1552:
                   1553:        while (1) {
                   1554:                if (skipwhite)
                   1555:                        while (isspace((unsigned char)v[*pos]))
                   1556:                                (*pos)++;
                   1557:
                   1558:                if ( ! roff_getop(v, pos, &operator))
                   1559:                        break;
                   1560:
                   1561:                if (skipwhite)
                   1562:                        while (isspace((unsigned char)v[*pos]))
                   1563:                                (*pos)++;
                   1564:
1.234     kristaps 1565:                if ( ! roff_evalpar(r, ln, v, pos, &operand2))
1.204     schwarze 1566:                        return(0);
                   1567:
                   1568:                if (skipwhite)
                   1569:                        while (isspace((unsigned char)v[*pos]))
                   1570:                                (*pos)++;
1.206     schwarze 1571:
                   1572:                if (NULL == res)
                   1573:                        continue;
1.204     schwarze 1574:
                   1575:                switch (operator) {
1.207     schwarze 1576:                case '+':
1.204     schwarze 1577:                        *res += operand2;
                   1578:                        break;
1.207     schwarze 1579:                case '-':
1.204     schwarze 1580:                        *res -= operand2;
                   1581:                        break;
1.207     schwarze 1582:                case '*':
1.204     schwarze 1583:                        *res *= operand2;
                   1584:                        break;
1.207     schwarze 1585:                case '/':
1.244     schwarze 1586:                        if (operand2 == 0) {
1.235     schwarze 1587:                                mandoc_msg(MANDOCERR_DIVZERO,
1.234     kristaps 1588:                                        r->parse, ln, *pos, v);
                   1589:                                *res = 0;
                   1590:                                break;
                   1591:                        }
1.204     schwarze 1592:                        *res /= operand2;
                   1593:                        break;
1.207     schwarze 1594:                case '%':
1.244     schwarze 1595:                        if (operand2 == 0) {
                   1596:                                mandoc_msg(MANDOCERR_DIVZERO,
                   1597:                                        r->parse, ln, *pos, v);
                   1598:                                *res = 0;
                   1599:                                break;
                   1600:                        }
1.204     schwarze 1601:                        *res %= operand2;
                   1602:                        break;
1.207     schwarze 1603:                case '<':
1.204     schwarze 1604:                        *res = *res < operand2;
                   1605:                        break;
1.207     schwarze 1606:                case '>':
1.204     schwarze 1607:                        *res = *res > operand2;
                   1608:                        break;
1.207     schwarze 1609:                case 'l':
1.204     schwarze 1610:                        *res = *res <= operand2;
                   1611:                        break;
1.207     schwarze 1612:                case 'g':
1.204     schwarze 1613:                        *res = *res >= operand2;
                   1614:                        break;
1.207     schwarze 1615:                case '=':
1.204     schwarze 1616:                        *res = *res == operand2;
                   1617:                        break;
1.207     schwarze 1618:                case '!':
1.204     schwarze 1619:                        *res = *res != operand2;
                   1620:                        break;
1.207     schwarze 1621:                case '&':
1.204     schwarze 1622:                        *res = *res && operand2;
                   1623:                        break;
1.207     schwarze 1624:                case ':':
1.204     schwarze 1625:                        *res = *res || operand2;
                   1626:                        break;
1.207     schwarze 1627:                case 'i':
1.204     schwarze 1628:                        if (operand2 < *res)
                   1629:                                *res = operand2;
                   1630:                        break;
1.207     schwarze 1631:                case 'a':
1.204     schwarze 1632:                        if (operand2 > *res)
                   1633:                                *res = operand2;
                   1634:                        break;
                   1635:                default:
                   1636:                        abort();
                   1637:                }
                   1638:        }
                   1639:        return(1);
                   1640: }
                   1641:
1.180     schwarze 1642: void
1.187     schwarze 1643: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1644: {
1.180     schwarze 1645:        struct roffreg  *reg;
                   1646:
                   1647:        /* Search for an existing register with the same name. */
                   1648:        reg = r->regtab;
                   1649:
                   1650:        while (reg && strcmp(name, reg->key.p))
                   1651:                reg = reg->next;
1.147     kristaps 1652:
1.180     schwarze 1653:        if (NULL == reg) {
                   1654:                /* Create a new register. */
                   1655:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1656:                reg->key.p = mandoc_strdup(name);
                   1657:                reg->key.sz = strlen(name);
1.187     schwarze 1658:                reg->val = 0;
1.180     schwarze 1659:                reg->next = r->regtab;
                   1660:                r->regtab = reg;
                   1661:        }
                   1662:
1.187     schwarze 1663:        if ('+' == sign)
                   1664:                reg->val += val;
                   1665:        else if ('-' == sign)
                   1666:                reg->val -= val;
                   1667:        else
                   1668:                reg->val = val;
1.147     kristaps 1669: }
                   1670:
1.192     schwarze 1671: /*
                   1672:  * Handle some predefined read-only number registers.
                   1673:  * For now, return -1 if the requested register is not predefined;
                   1674:  * in case a predefined read-only register having the value -1
                   1675:  * were to turn up, another special value would have to be chosen.
                   1676:  */
                   1677: static int
                   1678: roff_getregro(const char *name)
                   1679: {
                   1680:
                   1681:        switch (*name) {
1.207     schwarze 1682:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1683:                return(0);
1.207     schwarze 1684:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1685:                return(1);
1.207     schwarze 1686:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1687:                return (24);
1.207     schwarze 1688:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1689:                return(0);
1.207     schwarze 1690:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1691:                return(1);
1.207     schwarze 1692:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1693:                return (40);
                   1694:        default:
                   1695:                return (-1);
                   1696:        }
                   1697: }
                   1698:
1.181     schwarze 1699: int
1.180     schwarze 1700: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1701: {
1.180     schwarze 1702:        struct roffreg  *reg;
1.192     schwarze 1703:        int              val;
                   1704:
                   1705:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1706:                val = roff_getregro(name + 1);
                   1707:                if (-1 != val)
                   1708:                        return (val);
                   1709:        }
1.180     schwarze 1710:
                   1711:        for (reg = r->regtab; reg; reg = reg->next)
                   1712:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1713:                        return(reg->val);
                   1714:
                   1715:        return(0);
                   1716: }
                   1717:
                   1718: static int
                   1719: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1720: {
                   1721:        struct roffreg  *reg;
1.192     schwarze 1722:        int              val;
                   1723:
                   1724:        if ('.' == name[0] && 2 == len) {
                   1725:                val = roff_getregro(name + 1);
                   1726:                if (-1 != val)
                   1727:                        return (val);
                   1728:        }
1.181     schwarze 1729:
                   1730:        for (reg = r->regtab; reg; reg = reg->next)
                   1731:                if (len == reg->key.sz &&
                   1732:                    0 == strncmp(name, reg->key.p, len))
                   1733:                        return(reg->val);
1.147     kristaps 1734:
1.180     schwarze 1735:        return(0);
1.147     kristaps 1736: }
                   1737:
1.180     schwarze 1738: static void
                   1739: roff_freereg(struct roffreg *reg)
1.147     kristaps 1740: {
1.180     schwarze 1741:        struct roffreg  *old_reg;
1.147     kristaps 1742:
1.180     schwarze 1743:        while (NULL != reg) {
                   1744:                free(reg->key.p);
                   1745:                old_reg = reg;
                   1746:                reg = reg->next;
                   1747:                free(old_reg);
                   1748:        }
1.147     kristaps 1749: }
1.92      schwarze 1750:
                   1751: static enum rofferr
1.89      kristaps 1752: roff_nr(ROFF_ARGS)
1.83      schwarze 1753: {
1.212     schwarze 1754:        char            *key, *val;
                   1755:        size_t           keysz;
1.138     kristaps 1756:        int              iv;
1.187     schwarze 1757:        char             sign;
1.89      kristaps 1758:
1.238     schwarze 1759:        key = val = buf->buf + pos;
                   1760:        if (*key == '\0')
1.212     schwarze 1761:                return(ROFF_IGN);
                   1762:
                   1763:        keysz = roff_getname(r, &val, ln, pos);
1.238     schwarze 1764:        if (key[keysz] == '\\')
1.212     schwarze 1765:                return(ROFF_IGN);
                   1766:        key[keysz] = '\0';
1.89      kristaps 1767:
1.187     schwarze 1768:        sign = *val;
1.238     schwarze 1769:        if (sign == '+' || sign == '-')
1.187     schwarze 1770:                val++;
                   1771:
1.234     kristaps 1772:        if (roff_evalnum(r, ln, val, NULL, &iv, 0))
1.204     schwarze 1773:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1774:
1.203     schwarze 1775:        return(ROFF_IGN);
                   1776: }
                   1777:
                   1778: static enum rofferr
                   1779: roff_rr(ROFF_ARGS)
                   1780: {
                   1781:        struct roffreg  *reg, **prev;
1.212     schwarze 1782:        char            *name, *cp;
                   1783:        size_t           namesz;
1.203     schwarze 1784:
1.238     schwarze 1785:        name = cp = buf->buf + pos;
                   1786:        if (*name == '\0')
1.212     schwarze 1787:                return(ROFF_IGN);
                   1788:        namesz = roff_getname(r, &cp, ln, pos);
                   1789:        name[namesz] = '\0';
1.203     schwarze 1790:
                   1791:        prev = &r->regtab;
                   1792:        while (1) {
                   1793:                reg = *prev;
1.238     schwarze 1794:                if (reg == NULL || !strcmp(name, reg->key.p))
1.203     schwarze 1795:                        break;
                   1796:                prev = &reg->next;
                   1797:        }
1.238     schwarze 1798:        if (reg != NULL) {
1.203     schwarze 1799:                *prev = reg->next;
                   1800:                free(reg->key.p);
                   1801:                free(reg);
                   1802:        }
1.122     schwarze 1803:        return(ROFF_IGN);
                   1804: }
                   1805:
                   1806: static enum rofferr
                   1807: roff_rm(ROFF_ARGS)
                   1808: {
                   1809:        const char       *name;
                   1810:        char             *cp;
1.212     schwarze 1811:        size_t            namesz;
1.122     schwarze 1812:
1.238     schwarze 1813:        cp = buf->buf + pos;
                   1814:        while (*cp != '\0') {
1.212     schwarze 1815:                name = cp;
1.238     schwarze 1816:                namesz = roff_getname(r, &cp, ln, (int)(cp - buf->buf));
1.212     schwarze 1817:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
1.238     schwarze 1818:                if (name[namesz] == '\\')
1.212     schwarze 1819:                        break;
1.122     schwarze 1820:        }
1.178     schwarze 1821:        return(ROFF_IGN);
                   1822: }
                   1823:
                   1824: static enum rofferr
                   1825: roff_it(ROFF_ARGS)
                   1826: {
                   1827:        char            *cp;
                   1828:        size_t           len;
                   1829:        int              iv;
                   1830:
                   1831:        /* Parse the number of lines. */
1.238     schwarze 1832:        cp = buf->buf + pos;
1.178     schwarze 1833:        len = strcspn(cp, " \t");
                   1834:        cp[len] = '\0';
                   1835:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
1.222     schwarze 1836:                mandoc_msg(MANDOCERR_IT_NONUM, r->parse,
1.238     schwarze 1837:                    ln, ppos, buf->buf + 1);
1.178     schwarze 1838:                return(ROFF_IGN);
                   1839:        }
                   1840:        cp += len + 1;
                   1841:
                   1842:        /* Arm the input line trap. */
                   1843:        roffit_lines = iv;
                   1844:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1845:        return(ROFF_IGN);
1.175     schwarze 1846: }
                   1847:
                   1848: static enum rofferr
                   1849: roff_Dd(ROFF_ARGS)
                   1850: {
                   1851:        const char *const       *cp;
                   1852:
1.227     schwarze 1853:        if ((r->options & (MPARSE_MDOC | MPARSE_QUICK)) == 0)
1.175     schwarze 1854:                for (cp = __mdoc_reserved; *cp; cp++)
                   1855:                        roff_setstr(r, *cp, NULL, 0);
                   1856:
1.227     schwarze 1857:        if (r->format == 0)
                   1858:                r->format = MPARSE_MDOC;
                   1859:
1.175     schwarze 1860:        return(ROFF_CONT);
                   1861: }
                   1862:
                   1863: static enum rofferr
                   1864: roff_TH(ROFF_ARGS)
                   1865: {
                   1866:        const char *const       *cp;
                   1867:
1.227     schwarze 1868:        if ((r->options & MPARSE_QUICK) == 0)
1.175     schwarze 1869:                for (cp = __man_reserved; *cp; cp++)
                   1870:                        roff_setstr(r, *cp, NULL, 0);
                   1871:
1.227     schwarze 1872:        if (r->format == 0)
                   1873:                r->format = MPARSE_MAN;
                   1874:
1.175     schwarze 1875:        return(ROFF_CONT);
1.109     kristaps 1876: }
                   1877:
                   1878: static enum rofferr
                   1879: roff_TE(ROFF_ARGS)
                   1880: {
                   1881:
                   1882:        if (NULL == r->tbl)
1.221     schwarze 1883:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1884:                    ln, ppos, "TE");
1.115     kristaps 1885:        else
1.151     kristaps 1886:                tbl_end(&r->tbl);
1.109     kristaps 1887:
1.112     kristaps 1888:        return(ROFF_IGN);
                   1889: }
                   1890:
                   1891: static enum rofferr
                   1892: roff_T_(ROFF_ARGS)
                   1893: {
                   1894:
                   1895:        if (NULL == r->tbl)
1.221     schwarze 1896:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1897:                    ln, ppos, "T&");
1.112     kristaps 1898:        else
1.116     kristaps 1899:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1900:
1.109     kristaps 1901:        return(ROFF_IGN);
                   1902: }
                   1903:
1.230     schwarze 1904: /*
                   1905:  * Handle in-line equation delimiters.
                   1906:  */
                   1907: static enum rofferr
1.238     schwarze 1908: roff_eqndelim(struct roff *r, struct buf *buf, int pos)
1.151     kristaps 1909: {
1.233     schwarze 1910:        char            *cp1, *cp2;
                   1911:        const char      *bef_pr, *bef_nl, *mac, *aft_nl, *aft_pr;
1.151     kristaps 1912:
1.230     schwarze 1913:        /*
                   1914:         * Outside equations, look for an opening delimiter.
                   1915:         * If we are inside an equation, we already know it is
                   1916:         * in-line, or this function wouldn't have been called;
                   1917:         * so look for a closing delimiter.
                   1918:         */
                   1919:
1.238     schwarze 1920:        cp1 = buf->buf + pos;
1.230     schwarze 1921:        cp2 = strchr(cp1, r->eqn == NULL ?
                   1922:            r->last_eqn->odelim : r->last_eqn->cdelim);
                   1923:        if (cp2 == NULL)
                   1924:                return(ROFF_CONT);
                   1925:
1.233     schwarze 1926:        *cp2++ = '\0';
                   1927:        bef_pr = bef_nl = aft_nl = aft_pr = "";
                   1928:
                   1929:        /* Handle preceding text, protecting whitespace. */
                   1930:
1.238     schwarze 1931:        if (*buf->buf != '\0') {
1.233     schwarze 1932:                if (r->eqn == NULL)
                   1933:                        bef_pr = "\\&";
                   1934:                bef_nl = "\n";
                   1935:        }
                   1936:
                   1937:        /*
                   1938:         * Prepare replacing the delimiter with an equation macro
                   1939:         * and drop leading white space from the equation.
                   1940:         */
1.230     schwarze 1941:
1.233     schwarze 1942:        if (r->eqn == NULL) {
                   1943:                while (*cp2 == ' ')
                   1944:                        cp2++;
                   1945:                mac = ".EQ";
                   1946:        } else
                   1947:                mac = ".EN";
                   1948:
                   1949:        /* Handle following text, protecting whitespace. */
                   1950:
                   1951:        if (*cp2 != '\0') {
                   1952:                aft_nl = "\n";
                   1953:                if (r->eqn != NULL)
                   1954:                        aft_pr = "\\&";
                   1955:        }
                   1956:
                   1957:        /* Do the actual replacement. */
                   1958:
1.238     schwarze 1959:        buf->sz = mandoc_asprintf(&cp1, "%s%s%s%s%s%s%s", buf->buf,
1.233     schwarze 1960:            bef_pr, bef_nl, mac, aft_nl, aft_pr, cp2) + 1;
1.238     schwarze 1961:        free(buf->buf);
                   1962:        buf->buf = cp1;
1.230     schwarze 1963:
                   1964:        /* Toggle the in-line state of the eqn subsystem. */
                   1965:
                   1966:        r->eqn_inline = r->eqn == NULL;
                   1967:        return(ROFF_REPARSE);
1.151     kristaps 1968: }
                   1969:
1.235     schwarze 1970: static enum rofferr
                   1971: roff_EQ(ROFF_ARGS)
1.125     kristaps 1972: {
1.151     kristaps 1973:        struct eqn_node *e;
1.125     kristaps 1974:
1.238     schwarze 1975:        assert(r->eqn == NULL);
1.235     schwarze 1976:        e = eqn_alloc(ppos, ln, r->parse);
1.125     kristaps 1977:
1.230     schwarze 1978:        if (r->last_eqn) {
1.125     kristaps 1979:                r->last_eqn->next = e;
1.230     schwarze 1980:                e->delim = r->last_eqn->delim;
                   1981:                e->odelim = r->last_eqn->odelim;
                   1982:                e->cdelim = r->last_eqn->cdelim;
                   1983:        } else
1.125     kristaps 1984:                r->first_eqn = r->last_eqn = e;
                   1985:
                   1986:        r->eqn = r->last_eqn = e;
1.151     kristaps 1987:
1.238     schwarze 1988:        if (buf->buf[pos] != '\0')
1.235     schwarze 1989:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
1.238     schwarze 1990:                    ".EQ %s", buf->buf + pos);
1.151     kristaps 1991:
1.125     kristaps 1992:        return(ROFF_IGN);
                   1993: }
                   1994:
                   1995: static enum rofferr
                   1996: roff_EN(ROFF_ARGS)
                   1997: {
                   1998:
1.221     schwarze 1999:        mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse, ln, ppos, "EN");
1.125     kristaps 2000:        return(ROFF_IGN);
                   2001: }
                   2002:
                   2003: static enum rofferr
1.109     kristaps 2004: roff_TS(ROFF_ARGS)
                   2005: {
1.176     schwarze 2006:        struct tbl_node *tbl;
1.89      kristaps 2007:
1.115     kristaps 2008:        if (r->tbl) {
1.221     schwarze 2009:                mandoc_msg(MANDOCERR_BLK_BROKEN, r->parse,
                   2010:                    ln, ppos, "TS breaks TS");
1.151     kristaps 2011:                tbl_end(&r->tbl);
1.115     kristaps 2012:        }
1.83      schwarze 2013:
1.176     schwarze 2014:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 2015:
                   2016:        if (r->last_tbl)
1.176     schwarze 2017:                r->last_tbl->next = tbl;
1.113     kristaps 2018:        else
1.176     schwarze 2019:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 2020:
1.176     schwarze 2021:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 2022:        return(ROFF_IGN);
1.92      schwarze 2023: }
                   2024:
1.105     kristaps 2025: static enum rofferr
1.174     kristaps 2026: roff_cc(ROFF_ARGS)
                   2027: {
                   2028:        const char      *p;
                   2029:
1.238     schwarze 2030:        p = buf->buf + pos;
1.174     kristaps 2031:
1.238     schwarze 2032:        if (*p == '\0' || (r->control = *p++) == '.')
1.174     kristaps 2033:                r->control = 0;
                   2034:
1.238     schwarze 2035:        if (*p != '\0')
1.174     kristaps 2036:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2037:
                   2038:        return(ROFF_IGN);
                   2039: }
                   2040:
                   2041: static enum rofferr
1.164     kristaps 2042: roff_tr(ROFF_ARGS)
                   2043: {
                   2044:        const char      *p, *first, *second;
                   2045:        size_t           fsz, ssz;
                   2046:        enum mandoc_esc  esc;
                   2047:
1.238     schwarze 2048:        p = buf->buf + pos;
1.164     kristaps 2049:
1.238     schwarze 2050:        if (*p == '\0') {
1.164     kristaps 2051:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2052:                return(ROFF_IGN);
                   2053:        }
                   2054:
1.238     schwarze 2055:        while (*p != '\0') {
1.164     kristaps 2056:                fsz = ssz = 1;
                   2057:
                   2058:                first = p++;
1.238     schwarze 2059:                if (*first == '\\') {
1.164     kristaps 2060:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2061:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2062:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2063:                                    ln, (int)(p - buf->buf), first);
1.164     kristaps 2064:                                return(ROFF_IGN);
                   2065:                        }
                   2066:                        fsz = (size_t)(p - first);
                   2067:                }
                   2068:
                   2069:                second = p++;
1.238     schwarze 2070:                if (*second == '\\') {
1.164     kristaps 2071:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2072:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2073:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2074:                                    ln, (int)(p - buf->buf), second);
1.164     kristaps 2075:                                return(ROFF_IGN);
                   2076:                        }
                   2077:                        ssz = (size_t)(p - second);
1.238     schwarze 2078:                } else if (*second == '\0') {
1.207     schwarze 2079:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
1.238     schwarze 2080:                            ln, (int)(p - buf->buf), NULL);
1.164     kristaps 2081:                        second = " ";
1.165     kristaps 2082:                        p--;
1.164     kristaps 2083:                }
                   2084:
1.167     kristaps 2085:                if (fsz > 1) {
1.207     schwarze 2086:                        roff_setstrn(&r->xmbtab, first, fsz,
                   2087:                            second, ssz, 0);
1.167     kristaps 2088:                        continue;
                   2089:                }
                   2090:
1.238     schwarze 2091:                if (r->xtab == NULL)
1.207     schwarze 2092:                        r->xtab = mandoc_calloc(128,
                   2093:                            sizeof(struct roffstr));
1.167     kristaps 2094:
                   2095:                free(r->xtab[(int)*first].p);
                   2096:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   2097:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 2098:        }
                   2099:
                   2100:        return(ROFF_IGN);
                   2101: }
                   2102:
                   2103: static enum rofferr
1.105     kristaps 2104: roff_so(ROFF_ARGS)
                   2105: {
                   2106:        char *name;
                   2107:
1.238     schwarze 2108:        name = buf->buf + pos;
1.224     schwarze 2109:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, "so %s", name);
1.105     kristaps 2110:
                   2111:        /*
                   2112:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   2113:         * opening anything that's not in our cwd or anything beneath
                   2114:         * it.  Thus, explicitly disallow traversing up the file-system
                   2115:         * or using absolute paths.
                   2116:         */
                   2117:
1.238     schwarze 2118:        if (*name == '/' || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 2119:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   2120:                    ".so %s", name);
1.105     kristaps 2121:                return(ROFF_ERR);
                   2122:        }
                   2123:
                   2124:        *offs = pos;
                   2125:        return(ROFF_SO);
                   2126: }
1.92      schwarze 2127:
1.106     kristaps 2128: static enum rofferr
                   2129: roff_userdef(ROFF_ARGS)
1.99      kristaps 2130: {
1.106     kristaps 2131:        const char       *arg[9];
                   2132:        char             *cp, *n1, *n2;
1.119     schwarze 2133:        int               i;
1.106     kristaps 2134:
                   2135:        /*
                   2136:         * Collect pointers to macro argument strings
1.188     schwarze 2137:         * and NUL-terminate them.
1.106     kristaps 2138:         */
1.238     schwarze 2139:        cp = buf->buf + pos;
1.119     schwarze 2140:        for (i = 0; i < 9; i++)
1.238     schwarze 2141:                arg[i] = *cp == '\0' ? "" :
1.136     kristaps 2142:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 2143:
1.106     kristaps 2144:        /*
                   2145:         * Expand macro arguments.
1.99      kristaps 2146:         */
1.238     schwarze 2147:        buf->sz = 0;
1.106     kristaps 2148:        n1 = cp = mandoc_strdup(r->current_string);
1.238     schwarze 2149:        while ((cp = strstr(cp, "\\$")) != NULL) {
1.106     kristaps 2150:                i = cp[2] - '1';
                   2151:                if (0 > i || 8 < i) {
                   2152:                        /* Not an argument invocation. */
                   2153:                        cp += 2;
                   2154:                        continue;
                   2155:                }
1.209     schwarze 2156:                *cp = '\0';
1.238     schwarze 2157:                buf->sz = mandoc_asprintf(&n2, "%s%s%s",
1.209     schwarze 2158:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 2159:                cp = n2 + (cp - n1);
                   2160:                free(n1);
                   2161:                n1 = n2;
1.99      kristaps 2162:        }
                   2163:
1.106     kristaps 2164:        /*
                   2165:         * Replace the macro invocation
                   2166:         * by the expanded macro.
                   2167:         */
1.238     schwarze 2168:        free(buf->buf);
                   2169:        buf->buf = n1;
                   2170:        if (buf->sz == 0)
                   2171:                buf->sz = strlen(buf->buf) + 1;
1.106     kristaps 2172:
1.238     schwarze 2173:        return(buf->sz > 1 && buf->buf[buf->sz - 2] == '\n' ?
1.106     kristaps 2174:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2175: }
1.121     schwarze 2176:
1.212     schwarze 2177: static size_t
1.121     schwarze 2178: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2179: {
                   2180:        char     *name, *cp;
1.212     schwarze 2181:        size_t    namesz;
1.121     schwarze 2182:
                   2183:        name = *cpp;
                   2184:        if ('\0' == *name)
1.212     schwarze 2185:                return(0);
1.121     schwarze 2186:
1.212     schwarze 2187:        /* Read until end of name and terminate it with NUL. */
                   2188:        for (cp = name; 1; cp++) {
                   2189:                if ('\0' == *cp || ' ' == *cp) {
                   2190:                        namesz = cp - name;
                   2191:                        break;
                   2192:                }
1.121     schwarze 2193:                if ('\\' != *cp)
                   2194:                        continue;
1.215     schwarze 2195:                namesz = cp - name;
                   2196:                if ('{' == cp[1] || '}' == cp[1])
                   2197:                        break;
1.121     schwarze 2198:                cp++;
                   2199:                if ('\\' == *cp)
                   2200:                        continue;
1.224     schwarze 2201:                mandoc_vmsg(MANDOCERR_NAMESC, r->parse, ln, pos,
                   2202:                    "%.*s", (int)(cp - name + 1), name);
1.212     schwarze 2203:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2204:                break;
1.121     schwarze 2205:        }
                   2206:
                   2207:        /* Read past spaces. */
                   2208:        while (' ' == *cp)
                   2209:                cp++;
                   2210:
                   2211:        *cpp = cp;
1.212     schwarze 2212:        return(namesz);
1.121     schwarze 2213: }
                   2214:
1.106     kristaps 2215: /*
                   2216:  * Store *string into the user-defined string called *name.
                   2217:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2218:  * append == 0: replace mode
                   2219:  * append == 1: single-line append mode
                   2220:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2221:  */
1.94      kristaps 2222: static void
1.106     kristaps 2223: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2224:        int append)
1.92      schwarze 2225: {
1.164     kristaps 2226:
                   2227:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2228:            string ? strlen(string) : 0, append);
1.164     kristaps 2229: }
                   2230:
                   2231: static void
1.166     kristaps 2232: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2233:                const char *string, size_t stringsz, int append)
1.164     kristaps 2234: {
1.166     kristaps 2235:        struct roffkv   *n;
1.164     kristaps 2236:        char            *c;
                   2237:        int              i;
                   2238:        size_t           oldch, newch;
1.92      schwarze 2239:
1.106     kristaps 2240:        /* Search for an existing string with the same name. */
1.164     kristaps 2241:        n = *r;
                   2242:
1.211     schwarze 2243:        while (n && (namesz != n->key.sz ||
                   2244:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2245:                n = n->next;
1.94      kristaps 2246:
                   2247:        if (NULL == n) {
1.106     kristaps 2248:                /* Create a new string table entry. */
1.166     kristaps 2249:                n = mandoc_malloc(sizeof(struct roffkv));
                   2250:                n->key.p = mandoc_strndup(name, namesz);
                   2251:                n->key.sz = namesz;
                   2252:                n->val.p = NULL;
                   2253:                n->val.sz = 0;
1.164     kristaps 2254:                n->next = *r;
                   2255:                *r = n;
1.193     schwarze 2256:        } else if (0 == append) {
1.166     kristaps 2257:                free(n->val.p);
                   2258:                n->val.p = NULL;
                   2259:                n->val.sz = 0;
1.106     kristaps 2260:        }
                   2261:
                   2262:        if (NULL == string)
                   2263:                return;
                   2264:
                   2265:        /*
                   2266:         * One additional byte for the '\n' in multiline mode,
                   2267:         * and one for the terminating '\0'.
                   2268:         */
1.193     schwarze 2269:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2270:
1.166     kristaps 2271:        if (NULL == n->val.p) {
                   2272:                n->val.p = mandoc_malloc(newch);
                   2273:                *n->val.p = '\0';
1.106     kristaps 2274:                oldch = 0;
                   2275:        } else {
1.166     kristaps 2276:                oldch = n->val.sz;
                   2277:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2278:        }
                   2279:
                   2280:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2281:        c = n->val.p + (int)oldch;
1.106     kristaps 2282:
                   2283:        /* Append new content to the destination buffer. */
1.164     kristaps 2284:        i = 0;
                   2285:        while (i < (int)stringsz) {
1.106     kristaps 2286:                /*
                   2287:                 * Rudimentary roff copy mode:
                   2288:                 * Handle escaped backslashes.
                   2289:                 */
1.164     kristaps 2290:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2291:                        i++;
                   2292:                *c++ = string[i++];
1.106     kristaps 2293:        }
1.94      kristaps 2294:
1.106     kristaps 2295:        /* Append terminating bytes. */
1.193     schwarze 2296:        if (1 < append)
1.106     kristaps 2297:                *c++ = '\n';
1.163     kristaps 2298:
1.106     kristaps 2299:        *c = '\0';
1.166     kristaps 2300:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2301: }
                   2302:
1.94      kristaps 2303: static const char *
                   2304: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2305: {
1.166     kristaps 2306:        const struct roffkv *n;
1.191     schwarze 2307:        int i;
1.92      schwarze 2308:
1.164     kristaps 2309:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2310:                if (0 == strncmp(name, n->key.p, len) &&
                   2311:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2312:                        return(n->val.p);
1.191     schwarze 2313:
                   2314:        for (i = 0; i < PREDEFS_MAX; i++)
                   2315:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2316:                                '\0' == predefs[i].name[(int)len])
                   2317:                        return(predefs[i].str);
1.94      kristaps 2318:
1.157     kristaps 2319:        return(NULL);
1.92      schwarze 2320: }
                   2321:
1.94      kristaps 2322: static void
1.167     kristaps 2323: roff_freestr(struct roffkv *r)
1.92      schwarze 2324: {
1.166     kristaps 2325:        struct roffkv    *n, *nn;
1.92      schwarze 2326:
1.167     kristaps 2327:        for (n = r; n; n = nn) {
1.166     kristaps 2328:                free(n->key.p);
                   2329:                free(n->val.p);
1.92      schwarze 2330:                nn = n->next;
                   2331:                free(n);
                   2332:        }
1.114     kristaps 2333: }
                   2334:
                   2335: const struct tbl_span *
                   2336: roff_span(const struct roff *r)
                   2337: {
1.207     schwarze 2338:
1.114     kristaps 2339:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2340: }
                   2341:
                   2342: const struct eqn *
                   2343: roff_eqn(const struct roff *r)
                   2344: {
1.207     schwarze 2345:
1.125     kristaps 2346:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2347: }
                   2348:
                   2349: /*
                   2350:  * Duplicate an input string, making the appropriate character
                   2351:  * conversations (as stipulated by `tr') along the way.
                   2352:  * Returns a heap-allocated string with all the replacements made.
                   2353:  */
                   2354: char *
                   2355: roff_strdup(const struct roff *r, const char *p)
                   2356: {
1.166     kristaps 2357:        const struct roffkv *cp;
1.164     kristaps 2358:        char            *res;
                   2359:        const char      *pp;
                   2360:        size_t           ssz, sz;
                   2361:        enum mandoc_esc  esc;
                   2362:
1.167     kristaps 2363:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2364:                return(mandoc_strdup(p));
                   2365:        else if ('\0' == *p)
                   2366:                return(mandoc_strdup(""));
                   2367:
                   2368:        /*
                   2369:         * Step through each character looking for term matches
                   2370:         * (remember that a `tr' can be invoked with an escape, which is
                   2371:         * a glyph but the escape is multi-character).
                   2372:         * We only do this if the character hash has been initialised
                   2373:         * and the string is >0 length.
                   2374:         */
                   2375:
                   2376:        res = NULL;
                   2377:        ssz = 0;
                   2378:
                   2379:        while ('\0' != *p) {
1.167     kristaps 2380:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2381:                        sz = r->xtab[(int)*p].sz;
                   2382:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2383:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2384:                        ssz += sz;
                   2385:                        p++;
                   2386:                        continue;
                   2387:                } else if ('\\' != *p) {
                   2388:                        res = mandoc_realloc(res, ssz + 2);
                   2389:                        res[ssz++] = *p++;
                   2390:                        continue;
                   2391:                }
                   2392:
1.164     kristaps 2393:                /* Search for term matches. */
1.167     kristaps 2394:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2395:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2396:                                break;
                   2397:
                   2398:                if (NULL != cp) {
                   2399:                        /*
                   2400:                         * A match has been found.
                   2401:                         * Append the match to the array and move
                   2402:                         * forward by its keysize.
                   2403:                         */
1.207     schwarze 2404:                        res = mandoc_realloc(res,
                   2405:                            ssz + cp->val.sz + 1);
1.166     kristaps 2406:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2407:                        ssz += cp->val.sz;
                   2408:                        p += (int)cp->key.sz;
1.164     kristaps 2409:                        continue;
                   2410:                }
                   2411:
1.167     kristaps 2412:                /*
                   2413:                 * Handle escapes carefully: we need to copy
                   2414:                 * over just the escape itself, or else we might
                   2415:                 * do replacements within the escape itself.
                   2416:                 * Make sure to pass along the bogus string.
                   2417:                 */
                   2418:                pp = p++;
                   2419:                esc = mandoc_escape(&p, NULL, NULL);
                   2420:                if (ESCAPE_ERROR == esc) {
                   2421:                        sz = strlen(pp);
1.164     kristaps 2422:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2423:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2424:                        break;
1.164     kristaps 2425:                }
1.207     schwarze 2426:                /*
                   2427:                 * We bail out on bad escapes.
1.167     kristaps 2428:                 * No need to warn: we already did so when
                   2429:                 * roff_res() was called.
                   2430:                 */
                   2431:                sz = (int)(p - pp);
                   2432:                res = mandoc_realloc(res, ssz + sz + 1);
                   2433:                memcpy(res + ssz, pp, sz);
                   2434:                ssz += sz;
1.164     kristaps 2435:        }
                   2436:
                   2437:        res[(int)ssz] = '\0';
                   2438:        return(res);
1.227     schwarze 2439: }
                   2440:
                   2441: int
                   2442: roff_getformat(const struct roff *r)
                   2443: {
                   2444:
                   2445:        return(r->format);
1.174     kristaps 2446: }
                   2447:
                   2448: /*
1.207     schwarze 2449:  * Find out whether a line is a macro line or not.
1.174     kristaps 2450:  * If it is, adjust the current position and return one; if it isn't,
                   2451:  * return zero and don't change the current position.
                   2452:  * If the control character has been set with `.cc', then let that grain
                   2453:  * precedence.
                   2454:  * This is slighly contrary to groff, where using the non-breaking
                   2455:  * control character when `cc' has been invoked will cause the
                   2456:  * non-breaking macro contents to be printed verbatim.
                   2457:  */
                   2458: int
                   2459: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2460: {
                   2461:        int             pos;
                   2462:
                   2463:        pos = *ppos;
                   2464:
                   2465:        if (0 != r->control && cp[pos] == r->control)
                   2466:                pos++;
                   2467:        else if (0 != r->control)
                   2468:                return(0);
                   2469:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2470:                pos += 2;
                   2471:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2472:                pos++;
                   2473:        else
                   2474:                return(0);
                   2475:
                   2476:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2477:                pos++;
                   2478:
                   2479:        *ppos = pos;
                   2480:        return(1);
1.74      kristaps 2481: }

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