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Annotation of mandoc/roff.c, Revision 1.246

1.246   ! schwarze    1: /*     $Id: roff.c,v 1.245 2014/12/25 17:23:32 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 = "";
1.246   ! schwarze  654:                } else if (buf->sz + strlen(res) > SHRT_MAX) {
        !           655:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
        !           656:                            ln, (int)(stesc - buf->buf), NULL);
        !           657:                        return(ROFF_IGN);
1.94      kristaps  658:                }
                    659:
1.108     schwarze  660:                /* Replace the escape sequence by the string. */
                    661:
1.209     schwarze  662:                *stesc = '\0';
1.238     schwarze  663:                buf->sz = mandoc_asprintf(&nbuf, "%s%s%s",
                    664:                    buf->buf, res, cp) + 1;
1.94      kristaps  665:
1.205     schwarze  666:                /* Prepare for the next replacement. */
1.94      kristaps  667:
1.205     schwarze  668:                start = nbuf + pos;
1.238     schwarze  669:                stesc = nbuf + (stesc - buf->buf) + strlen(res);
                    670:                free(buf->buf);
                    671:                buf->buf = nbuf;
1.154     kristaps  672:        }
1.172     schwarze  673:        return(ROFF_CONT);
1.154     kristaps  674: }
                    675:
                    676: /*
1.178     schwarze  677:  * Process text streams:
                    678:  * Convert all breakable hyphens into ASCII_HYPH.
                    679:  * Decrement and spring input line trap.
1.154     kristaps  680:  */
                    681: static enum rofferr
1.238     schwarze  682: roff_parsetext(struct buf *buf, int pos, int *offs)
1.154     kristaps  683: {
                    684:        size_t           sz;
                    685:        const char      *start;
1.178     schwarze  686:        char            *p;
                    687:        int              isz;
1.154     kristaps  688:        enum mandoc_esc  esc;
                    689:
1.238     schwarze  690:        start = p = buf->buf + pos;
1.154     kristaps  691:
1.238     schwarze  692:        while (*p != '\0') {
1.154     kristaps  693:                sz = strcspn(p, "-\\");
                    694:                p += sz;
                    695:
1.238     schwarze  696:                if (*p == '\0')
1.159     kristaps  697:                        break;
                    698:
1.238     schwarze  699:                if (*p == '\\') {
1.154     kristaps  700:                        /* Skip over escapes. */
                    701:                        p++;
1.189     schwarze  702:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.238     schwarze  703:                        if (esc == ESCAPE_ERROR)
1.154     kristaps  704:                                break;
1.155     kristaps  705:                        continue;
1.159     kristaps  706:                } else if (p == start) {
1.158     kristaps  707:                        p++;
1.155     kristaps  708:                        continue;
1.158     kristaps  709:                }
1.155     kristaps  710:
1.171     schwarze  711:                if (isalpha((unsigned char)p[-1]) &&
                    712:                    isalpha((unsigned char)p[1]))
1.155     kristaps  713:                        *p = ASCII_HYPH;
                    714:                p++;
1.94      kristaps  715:        }
                    716:
1.178     schwarze  717:        /* Spring the input line trap. */
1.238     schwarze  718:        if (roffit_lines == 1) {
                    719:                isz = mandoc_asprintf(&p, "%s\n.%s", buf->buf, roffit_macro);
                    720:                free(buf->buf);
                    721:                buf->buf = p;
                    722:                buf->sz = isz + 1;
1.178     schwarze  723:                *offs = 0;
                    724:                free(roffit_macro);
                    725:                roffit_lines = 0;
                    726:                return(ROFF_REPARSE);
1.238     schwarze  727:        } else if (roffit_lines > 1)
1.178     schwarze  728:                --roffit_lines;
1.154     kristaps  729:        return(ROFF_CONT);
1.94      kristaps  730: }
                    731:
1.67      kristaps  732: enum rofferr
1.238     schwarze  733: roff_parseln(struct roff *r, int ln, struct buf *buf, int *offs)
1.67      kristaps  734: {
                    735:        enum rofft       t;
1.109     kristaps  736:        enum rofferr     e;
1.238     schwarze  737:        int              pos;   /* parse point */
1.243     schwarze  738:        int              spos;  /* saved parse point for messages */
1.238     schwarze  739:        int              ppos;  /* original offset in buf->buf */
                    740:        int              ctl;   /* macro line (boolean) */
                    741:
                    742:        ppos = pos = *offs;
1.79      kristaps  743:
1.230     schwarze  744:        /* Handle in-line equation delimiters. */
                    745:
1.236     schwarze  746:        if (r->tbl == NULL &&
                    747:            r->last_eqn != NULL && r->last_eqn->delim &&
1.230     schwarze  748:            (r->eqn == NULL || r->eqn_inline)) {
1.238     schwarze  749:                e = roff_eqndelim(r, buf, pos);
1.230     schwarze  750:                if (e == ROFF_REPARSE)
                    751:                        return(e);
                    752:                assert(e == ROFF_CONT);
                    753:        }
                    754:
                    755:        /* Expand some escape sequences. */
1.94      kristaps  756:
1.238     schwarze  757:        e = roff_res(r, buf, ln, pos);
                    758:        if (e == ROFF_IGN)
1.172     schwarze  759:                return(e);
1.238     schwarze  760:        assert(e == ROFF_CONT);
1.94      kristaps  761:
1.238     schwarze  762:        ctl = roff_getcontrol(r, buf->buf, &pos);
1.130     kristaps  763:
1.94      kristaps  764:        /*
1.79      kristaps  765:         * First, if a scope is open and we're not a macro, pass the
                    766:         * text through the macro's filter.  If a scope isn't open and
                    767:         * we're not a macro, just let it through.
1.125     kristaps  768:         * Finally, if there's an equation scope open, divert it into it
                    769:         * no matter our state.
1.79      kristaps  770:         */
1.74      kristaps  771:
1.130     kristaps  772:        if (r->last && ! ctl) {
1.78      kristaps  773:                t = r->last->tok;
                    774:                assert(roffs[t].text);
1.238     schwarze  775:                e = (*roffs[t].text)(r, t, buf, ln, pos, pos, offs);
                    776:                assert(e == ROFF_IGN || e == ROFF_CONT);
                    777:                if (e != ROFF_CONT)
1.125     kristaps  778:                        return(e);
1.182     schwarze  779:        }
                    780:        if (r->eqn)
1.238     schwarze  781:                return(eqn_read(&r->eqn, ln, buf->buf, ppos, offs));
1.182     schwarze  782:        if ( ! ctl) {
1.125     kristaps  783:                if (r->tbl)
1.238     schwarze  784:                        return(tbl_read(r->tbl, ln, buf->buf, pos));
                    785:                return(roff_parsetext(buf, pos, offs));
1.182     schwarze  786:        }
1.228     schwarze  787:
                    788:        /* Skip empty request lines. */
                    789:
1.238     schwarze  790:        if (buf->buf[pos] == '"') {
1.228     schwarze  791:                mandoc_msg(MANDOCERR_COMMENT_BAD, r->parse,
                    792:                    ln, pos, NULL);
                    793:                return(ROFF_IGN);
1.238     schwarze  794:        } else if (buf->buf[pos] == '\0')
1.228     schwarze  795:                return(ROFF_IGN);
1.67      kristaps  796:
1.79      kristaps  797:        /*
                    798:         * If a scope is open, go to the child handler for that macro,
                    799:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  800:         * Don't do so if an equation is open.
1.79      kristaps  801:         */
1.78      kristaps  802:
1.79      kristaps  803:        if (r->last) {
                    804:                t = r->last->tok;
                    805:                assert(roffs[t].sub);
1.238     schwarze  806:                return((*roffs[t].sub)(r, t, buf, ln, ppos, pos, offs));
1.79      kristaps  807:        }
1.78      kristaps  808:
1.243     schwarze  809:        /* No scope is open.  This is a new request or macro. */
                    810:
                    811:        spos = pos;
                    812:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
                    813:
                    814:        /* Tables ignore most macros. */
                    815:
                    816:        if (r->tbl != NULL && (t == ROFF_MAX || t == ROFF_TS)) {
                    817:                mandoc_msg(MANDOCERR_TBLMACRO, r->parse,
                    818:                    ln, pos, buf->buf + spos);
                    819:                return(ROFF_IGN);
                    820:        }
                    821:
1.79      kristaps  822:        /*
1.243     schwarze  823:         * This is neither a roff request nor a user-defined macro.
                    824:         * Let the standard macro set parsers handle it.
1.79      kristaps  825:         */
1.67      kristaps  826:
1.243     schwarze  827:        if (t == ROFF_MAX)
1.79      kristaps  828:                return(ROFF_CONT);
1.243     schwarze  829:
                    830:        /* Execute a roff request or a user defined macro. */
1.67      kristaps  831:
1.75      kristaps  832:        assert(roffs[t].proc);
1.238     schwarze  833:        return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.74      kristaps  834: }
                    835:
1.117     kristaps  836: void
1.74      kristaps  837: roff_endparse(struct roff *r)
                    838: {
                    839:
1.110     kristaps  840:        if (r->last)
1.221     schwarze  841:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    842:                    r->last->line, r->last->col,
                    843:                    roffs[r->last->tok].name);
1.117     kristaps  844:
1.125     kristaps  845:        if (r->eqn) {
1.221     schwarze  846:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    847:                    r->eqn->eqn.ln, r->eqn->eqn.pos, "EQ");
1.151     kristaps  848:                eqn_end(&r->eqn);
1.125     kristaps  849:        }
                    850:
1.117     kristaps  851:        if (r->tbl) {
1.221     schwarze  852:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    853:                    r->tbl->line, r->tbl->pos, "TS");
1.151     kristaps  854:                tbl_end(&r->tbl);
1.117     kristaps  855:        }
1.67      kristaps  856: }
                    857:
                    858: /*
                    859:  * Parse a roff node's type from the input buffer.  This must be in the
                    860:  * form of ".foo xxx" in the usual way.
                    861:  */
                    862: static enum rofft
1.214     schwarze  863: roff_parse(struct roff *r, char *buf, int *pos, int ln, int ppos)
1.67      kristaps  864: {
1.214     schwarze  865:        char            *cp;
1.106     kristaps  866:        const char      *mac;
                    867:        size_t           maclen;
1.67      kristaps  868:        enum rofft       t;
                    869:
1.214     schwarze  870:        cp = buf + *pos;
                    871:
                    872:        if ('\0' == *cp || '"' == *cp || '\t' == *cp || ' ' == *cp)
1.67      kristaps  873:                return(ROFF_MAX);
                    874:
1.214     schwarze  875:        mac = cp;
                    876:        maclen = roff_getname(r, &cp, ln, ppos);
1.67      kristaps  877:
1.106     kristaps  878:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  879:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  880:
1.214     schwarze  881:        if (ROFF_MAX != t)
                    882:                *pos = cp - buf;
1.67      kristaps  883:
                    884:        return(t);
                    885: }
                    886:
                    887: static enum rofferr
1.76      kristaps  888: roff_cblock(ROFF_ARGS)
1.67      kristaps  889: {
                    890:
1.79      kristaps  891:        /*
                    892:         * A block-close `..' should only be invoked as a child of an
                    893:         * ignore macro, otherwise raise a warning and just ignore it.
                    894:         */
                    895:
1.238     schwarze  896:        if (r->last == NULL) {
1.221     schwarze  897:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    898:                    ln, ppos, "..");
1.76      kristaps  899:                return(ROFF_IGN);
                    900:        }
1.67      kristaps  901:
1.81      kristaps  902:        switch (r->last->tok) {
1.207     schwarze  903:        case ROFF_am:
1.220     schwarze  904:                /* ROFF_am1 is remapped to ROFF_am in roff_block(). */
1.81      kristaps  905:                /* FALLTHROUGH */
1.207     schwarze  906:        case ROFF_ami:
1.81      kristaps  907:                /* FALLTHROUGH */
1.207     schwarze  908:        case ROFF_de:
1.108     schwarze  909:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  910:                /* FALLTHROUGH */
1.207     schwarze  911:        case ROFF_dei:
1.81      kristaps  912:                /* FALLTHROUGH */
1.207     schwarze  913:        case ROFF_ig:
1.81      kristaps  914:                break;
                    915:        default:
1.221     schwarze  916:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    917:                    ln, ppos, "..");
1.67      kristaps  918:                return(ROFF_IGN);
1.76      kristaps  919:        }
1.67      kristaps  920:
1.238     schwarze  921:        if (buf->buf[pos] != '\0')
1.217     schwarze  922:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
1.238     schwarze  923:                    ".. %s", buf->buf + pos);
1.71      kristaps  924:
                    925:        roffnode_pop(r);
1.76      kristaps  926:        roffnode_cleanscope(r);
                    927:        return(ROFF_IGN);
1.71      kristaps  928:
1.67      kristaps  929: }
                    930:
1.76      kristaps  931: static void
                    932: roffnode_cleanscope(struct roff *r)
1.67      kristaps  933: {
                    934:
1.76      kristaps  935:        while (r->last) {
1.173     schwarze  936:                if (--r->last->endspan != 0)
1.76      kristaps  937:                        break;
                    938:                roffnode_pop(r);
                    939:        }
1.67      kristaps  940: }
                    941:
1.195     schwarze  942: static void
                    943: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  944: {
                    945:
1.76      kristaps  946:        if (NULL == r->last) {
1.221     schwarze  947:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    948:                    ln, ppos, "\\}");
1.195     schwarze  949:                return;
1.76      kristaps  950:        }
                    951:
1.82      kristaps  952:        switch (r->last->tok) {
1.207     schwarze  953:        case ROFF_el:
1.82      kristaps  954:                /* FALLTHROUGH */
1.207     schwarze  955:        case ROFF_ie:
1.82      kristaps  956:                /* FALLTHROUGH */
1.207     schwarze  957:        case ROFF_if:
1.82      kristaps  958:                break;
                    959:        default:
1.221     schwarze  960:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    961:                    ln, ppos, "\\}");
1.195     schwarze  962:                return;
1.75      kristaps  963:        }
                    964:
1.76      kristaps  965:        if (r->last->endspan > -1) {
1.221     schwarze  966:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    967:                    ln, ppos, "\\}");
1.195     schwarze  968:                return;
1.76      kristaps  969:        }
                    970:
1.75      kristaps  971:        roffnode_pop(r);
1.76      kristaps  972:        roffnode_cleanscope(r);
1.195     schwarze  973:        return;
1.76      kristaps  974: }
                    975:
                    976: static enum rofferr
1.80      kristaps  977: roff_block(ROFF_ARGS)
1.76      kristaps  978: {
1.220     schwarze  979:        const char      *name;
                    980:        char            *iname, *cp;
1.213     schwarze  981:        size_t           namesz;
1.106     kristaps  982:
1.220     schwarze  983:        /* Ignore groff compatibility mode for now. */
1.76      kristaps  984:
1.238     schwarze  985:        if (tok == ROFF_de1)
1.220     schwarze  986:                tok = ROFF_de;
1.238     schwarze  987:        else if (tok == ROFF_am1)
1.220     schwarze  988:                tok = ROFF_am;
                    989:
                    990:        /* Parse the macro name argument. */
                    991:
1.238     schwarze  992:        cp = buf->buf + pos;
                    993:        if (tok == ROFF_ig) {
1.220     schwarze  994:                iname = NULL;
                    995:                namesz = 0;
                    996:        } else {
                    997:                iname = cp;
                    998:                namesz = roff_getname(r, &cp, ln, ppos);
                    999:                iname[namesz] = '\0';
                   1000:        }
1.107     kristaps 1001:
1.220     schwarze 1002:        /* Resolve the macro name argument if it is indirect. */
1.107     kristaps 1003:
1.238     schwarze 1004:        if (namesz && (tok == ROFF_dei || tok == ROFF_ami)) {
                   1005:                if ((name = roff_getstrn(r, iname, namesz)) == NULL) {
1.220     schwarze 1006:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze 1007:                            r->parse, ln, (int)(iname - buf->buf),
1.220     schwarze 1008:                            "%.*s", (int)namesz, iname);
                   1009:                        namesz = 0;
                   1010:                } else
                   1011:                        namesz = strlen(name);
                   1012:        } else
                   1013:                name = iname;
1.107     kristaps 1014:
1.238     schwarze 1015:        if (namesz == 0 && tok != ROFF_ig) {
1.220     schwarze 1016:                mandoc_msg(MANDOCERR_REQ_EMPTY, r->parse,
                   1017:                    ln, ppos, roffs[tok].name);
                   1018:                return(ROFF_IGN);
                   1019:        }
1.80      kristaps 1020:
1.106     kristaps 1021:        roffnode_push(r, tok, name, ln, ppos);
                   1022:
                   1023:        /*
                   1024:         * At the beginning of a `de' macro, clear the existing string
                   1025:         * with the same name, if there is one.  New content will be
1.193     schwarze 1026:         * appended from roff_block_text() in multiline mode.
1.106     kristaps 1027:         */
1.107     kristaps 1028:
1.238     schwarze 1029:        if (tok == ROFF_de || tok == ROFF_dei)
1.213     schwarze 1030:                roff_setstrn(&r->strtab, name, namesz, "", 0, 0);
1.76      kristaps 1031:
1.238     schwarze 1032:        if (*cp == '\0')
1.78      kristaps 1033:                return(ROFF_IGN);
                   1034:
1.220     schwarze 1035:        /* Get the custom end marker. */
1.107     kristaps 1036:
1.220     schwarze 1037:        iname = cp;
1.213     schwarze 1038:        namesz = roff_getname(r, &cp, ln, ppos);
1.220     schwarze 1039:
                   1040:        /* Resolve the end marker if it is indirect. */
                   1041:
1.238     schwarze 1042:        if (namesz && (tok == ROFF_dei || tok == ROFF_ami)) {
                   1043:                if ((name = roff_getstrn(r, iname, namesz)) == NULL) {
1.220     schwarze 1044:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
1.238     schwarze 1045:                            r->parse, ln, (int)(iname - buf->buf),
1.220     schwarze 1046:                            "%.*s", (int)namesz, iname);
                   1047:                        namesz = 0;
                   1048:                } else
                   1049:                        namesz = strlen(name);
                   1050:        } else
                   1051:                name = iname;
                   1052:
1.213     schwarze 1053:        if (namesz)
                   1054:                r->last->end = mandoc_strndup(name, namesz);
1.78      kristaps 1055:
1.238     schwarze 1056:        if (*cp != '\0')
1.217     schwarze 1057:                mandoc_vmsg(MANDOCERR_ARG_EXCESS, r->parse,
                   1058:                    ln, pos, ".%s ... %s", roffs[tok].name, cp);
1.74      kristaps 1059:
1.78      kristaps 1060:        return(ROFF_IGN);
                   1061: }
                   1062:
                   1063: static enum rofferr
1.80      kristaps 1064: roff_block_sub(ROFF_ARGS)
1.79      kristaps 1065: {
                   1066:        enum rofft      t;
                   1067:        int             i, j;
                   1068:
                   1069:        /*
                   1070:         * First check whether a custom macro exists at this level.  If
                   1071:         * it does, then check against it.  This is some of groff's
                   1072:         * stranger behaviours.  If we encountered a custom end-scope
                   1073:         * tag and that tag also happens to be a "real" macro, then we
                   1074:         * need to try interpreting it again as a real macro.  If it's
                   1075:         * not, then return ignore.  Else continue.
                   1076:         */
                   1077:
                   1078:        if (r->last->end) {
1.130     kristaps 1079:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.238     schwarze 1080:                        if (buf->buf[i] != r->last->end[j])
1.79      kristaps 1081:                                break;
                   1082:
1.238     schwarze 1083:                if (r->last->end[j] == '\0' &&
                   1084:                    (buf->buf[i] == '\0' ||
                   1085:                     buf->buf[i] == ' ' ||
                   1086:                     buf->buf[i] == '\t')) {
1.79      kristaps 1087:                        roffnode_pop(r);
                   1088:                        roffnode_cleanscope(r);
                   1089:
1.238     schwarze 1090:                        while (buf->buf[i] == ' ' || buf->buf[i] == '\t')
1.130     kristaps 1091:                                i++;
                   1092:
                   1093:                        pos = i;
1.238     schwarze 1094:                        if (roff_parse(r, buf->buf, &pos, ln, ppos) !=
                   1095:                            ROFF_MAX)
1.79      kristaps 1096:                                return(ROFF_RERUN);
                   1097:                        return(ROFF_IGN);
                   1098:                }
                   1099:        }
                   1100:
                   1101:        /*
                   1102:         * If we have no custom end-query or lookup failed, then try
                   1103:         * pulling it out of the hashtable.
                   1104:         */
                   1105:
1.238     schwarze 1106:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
1.79      kristaps 1107:
1.238     schwarze 1108:        if (t != ROFF_cblock) {
                   1109:                if (tok != ROFF_ig)
                   1110:                        roff_setstr(r, r->last->name, buf->buf + ppos, 2);
1.79      kristaps 1111:                return(ROFF_IGN);
1.106     kristaps 1112:        }
1.79      kristaps 1113:
                   1114:        assert(roffs[t].proc);
1.238     schwarze 1115:        return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.79      kristaps 1116: }
                   1117:
                   1118: static enum rofferr
1.80      kristaps 1119: roff_block_text(ROFF_ARGS)
1.78      kristaps 1120: {
                   1121:
1.238     schwarze 1122:        if (tok != ROFF_ig)
                   1123:                roff_setstr(r, r->last->name, buf->buf + pos, 2);
1.106     kristaps 1124:
1.78      kristaps 1125:        return(ROFF_IGN);
                   1126: }
                   1127:
                   1128: static enum rofferr
1.82      kristaps 1129: roff_cond_sub(ROFF_ARGS)
                   1130: {
                   1131:        enum rofft       t;
1.139     kristaps 1132:        char            *ep;
1.198     schwarze 1133:        int              rr;
1.82      kristaps 1134:
                   1135:        rr = r->last->rule;
1.139     kristaps 1136:        roffnode_cleanscope(r);
1.238     schwarze 1137:        t = roff_parse(r, buf->buf, &pos, ln, ppos);
1.82      kristaps 1138:
1.139     kristaps 1139:        /*
1.177     schwarze 1140:         * Fully handle known macros when they are structurally
                   1141:         * required or when the conditional evaluated to true.
1.87      kristaps 1142:         */
                   1143:
1.238     schwarze 1144:        if ((t != ROFF_MAX) &&
                   1145:            (rr || roffs[t].flags & ROFFMAC_STRUCT)) {
1.177     schwarze 1146:                assert(roffs[t].proc);
1.238     schwarze 1147:                return((*roffs[t].proc)(r, t, buf, ln, ppos, pos, offs));
1.177     schwarze 1148:        }
1.144     kristaps 1149:
1.196     schwarze 1150:        /*
                   1151:         * If `\}' occurs on a macro line without a preceding macro,
                   1152:         * drop the line completely.
                   1153:         */
                   1154:
1.238     schwarze 1155:        ep = buf->buf + pos;
                   1156:        if (ep[0] == '\\' && ep[1] == '}')
1.198     schwarze 1157:                rr = 0;
1.196     schwarze 1158:
1.177     schwarze 1159:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1160:
1.238     schwarze 1161:        while ((ep = strchr(ep, '\\')) != NULL) {
                   1162:                if (*(++ep) == '}') {
1.197     schwarze 1163:                        *ep = '&';
1.238     schwarze 1164:                        roff_ccond(r, ln, ep - buf->buf - 1);
1.197     schwarze 1165:                }
                   1166:                ++ep;
1.177     schwarze 1167:        }
1.198     schwarze 1168:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1169: }
                   1170:
                   1171: static enum rofferr
                   1172: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1173: {
1.140     kristaps 1174:        char            *ep;
1.198     schwarze 1175:        int              rr;
1.82      kristaps 1176:
                   1177:        rr = r->last->rule;
1.140     kristaps 1178:        roffnode_cleanscope(r);
1.82      kristaps 1179:
1.238     schwarze 1180:        ep = buf->buf + pos;
                   1181:        while ((ep = strchr(ep, '\\')) != NULL) {
                   1182:                if (*(++ep) == '}') {
1.197     schwarze 1183:                        *ep = '&';
1.238     schwarze 1184:                        roff_ccond(r, ln, ep - buf->buf - 1);
1.197     schwarze 1185:                }
                   1186:                ++ep;
1.78      kristaps 1187:        }
1.198     schwarze 1188:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1189: }
                   1190:
1.204     schwarze 1191: /*
                   1192:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1193:  * If there is at least one digit, return success and advance the
                   1194:  * parse point, else return failure and let the parse point unchanged.
                   1195:  * Ignore overflows, treat them just like the C language.
                   1196:  */
1.184     schwarze 1197: static int
                   1198: roff_getnum(const char *v, int *pos, int *res)
                   1199: {
1.206     schwarze 1200:        int      myres, n, p;
                   1201:
                   1202:        if (NULL == res)
                   1203:                res = &myres;
1.184     schwarze 1204:
                   1205:        p = *pos;
                   1206:        n = v[p] == '-';
                   1207:        if (n)
                   1208:                p++;
                   1209:
                   1210:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1211:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1212:        if (p == *pos + n)
                   1213:                return 0;
                   1214:
                   1215:        if (n)
                   1216:                *res = -*res;
                   1217:
                   1218:        *pos = p;
                   1219:        return 1;
                   1220: }
                   1221:
1.198     schwarze 1222: /*
                   1223:  * Evaluate a string comparison condition.
                   1224:  * The first character is the delimiter.
                   1225:  * Succeed if the string up to its second occurrence
                   1226:  * matches the string up to its third occurence.
                   1227:  * Advance the cursor after the third occurrence
                   1228:  * or lacking that, to the end of the line.
                   1229:  */
                   1230: static int
                   1231: roff_evalstrcond(const char *v, int *pos)
                   1232: {
                   1233:        const char      *s1, *s2, *s3;
                   1234:        int              match;
                   1235:
                   1236:        match = 0;
                   1237:        s1 = v + *pos;          /* initial delimiter */
                   1238:        s2 = s1 + 1;            /* for scanning the first string */
                   1239:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1240:
                   1241:        if (NULL == s3)         /* found no middle delimiter */
                   1242:                goto out;
                   1243:
                   1244:        while ('\0' != *++s3) {
                   1245:                if (*s2 != *s3) {  /* mismatch */
                   1246:                        s3 = strchr(s3, *s1);
                   1247:                        break;
                   1248:                }
                   1249:                if (*s3 == *s1) {  /* found the final delimiter */
                   1250:                        match = 1;
                   1251:                        break;
                   1252:                }
                   1253:                s2++;
                   1254:        }
                   1255:
                   1256: out:
                   1257:        if (NULL == s3)
                   1258:                s3 = strchr(s2, '\0');
1.242     schwarze 1259:        else if (*s3 != '\0')
1.198     schwarze 1260:                s3++;
                   1261:        *pos = s3 - v;
                   1262:        return(match);
                   1263: }
                   1264:
1.204     schwarze 1265: /*
                   1266:  * Evaluate an optionally negated single character, numerical,
                   1267:  * or string condition.
                   1268:  */
1.198     schwarze 1269: static int
1.234     kristaps 1270: roff_evalcond(struct roff *r, int ln, const char *v, int *pos)
1.88      kristaps 1271: {
1.241     schwarze 1272:        int      number, savepos, wanttrue;
1.88      kristaps 1273:
1.198     schwarze 1274:        if ('!' == v[*pos]) {
                   1275:                wanttrue = 0;
                   1276:                (*pos)++;
                   1277:        } else
                   1278:                wanttrue = 1;
                   1279:
1.88      kristaps 1280:        switch (v[*pos]) {
1.240     schwarze 1281:        case '\0':
                   1282:                return(0);
1.207     schwarze 1283:        case 'n':
1.198     schwarze 1284:                /* FALLTHROUGH */
1.207     schwarze 1285:        case 'o':
1.88      kristaps 1286:                (*pos)++;
1.198     schwarze 1287:                return(wanttrue);
1.207     schwarze 1288:        case 'c':
1.198     schwarze 1289:                /* FALLTHROUGH */
1.207     schwarze 1290:        case 'd':
1.198     schwarze 1291:                /* FALLTHROUGH */
1.207     schwarze 1292:        case 'e':
1.88      kristaps 1293:                /* FALLTHROUGH */
1.207     schwarze 1294:        case 'r':
1.88      kristaps 1295:                /* FALLTHROUGH */
1.207     schwarze 1296:        case 't':
1.239     schwarze 1297:                /* FALLTHROUGH */
                   1298:        case 'v':
1.88      kristaps 1299:                (*pos)++;
1.198     schwarze 1300:                return(!wanttrue);
1.88      kristaps 1301:        default:
                   1302:                break;
                   1303:        }
                   1304:
1.241     schwarze 1305:        savepos = *pos;
1.234     kristaps 1306:        if (roff_evalnum(r, ln, v, pos, &number, 0))
1.204     schwarze 1307:                return((number > 0) == wanttrue);
1.241     schwarze 1308:        else if (*pos == savepos)
                   1309:                return(roff_evalstrcond(v, pos) == wanttrue);
1.204     schwarze 1310:        else
1.241     schwarze 1311:                return (0);
1.88      kristaps 1312: }
                   1313:
1.74      kristaps 1314: static enum rofferr
1.103     kristaps 1315: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1316: {
1.123     schwarze 1317:
1.89      kristaps 1318:        return(ROFF_IGN);
                   1319: }
                   1320:
1.104     kristaps 1321: static enum rofferr
1.82      kristaps 1322: roff_cond(ROFF_ARGS)
1.74      kristaps 1323: {
1.173     schwarze 1324:
                   1325:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1326:
1.207     schwarze 1327:        /*
1.134     kristaps 1328:         * An `.el' has no conditional body: it will consume the value
                   1329:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1330:         * defaults to DENY.
1.134     kristaps 1331:         *
                   1332:         * If we're not an `el', however, then evaluate the conditional.
                   1333:         */
1.133     kristaps 1334:
1.238     schwarze 1335:        r->last->rule = tok == ROFF_el ?
1.207     schwarze 1336:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
1.238     schwarze 1337:            roff_evalcond(r, ln, buf->buf, &pos);
1.77      kristaps 1338:
1.134     kristaps 1339:        /*
                   1340:         * An if-else will put the NEGATION of the current evaluated
                   1341:         * conditional into the stack of rules.
                   1342:         */
                   1343:
1.238     schwarze 1344:        if (tok == ROFF_ie) {
1.223     schwarze 1345:                if (r->rstackpos + 1 == r->rstacksz) {
                   1346:                        r->rstacksz += 16;
                   1347:                        r->rstack = mandoc_reallocarray(r->rstack,
                   1348:                            r->rstacksz, sizeof(int));
1.134     kristaps 1349:                }
1.198     schwarze 1350:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1351:        }
1.88      kristaps 1352:
                   1353:        /* If the parent has false as its rule, then so do we. */
                   1354:
1.198     schwarze 1355:        if (r->last->parent && !r->last->parent->rule)
                   1356:                r->last->rule = 0;
1.88      kristaps 1357:
                   1358:        /*
1.173     schwarze 1359:         * Determine scope.
                   1360:         * If there is nothing on the line after the conditional,
                   1361:         * not even whitespace, use next-line scope.
1.88      kristaps 1362:         */
1.74      kristaps 1363:
1.238     schwarze 1364:        if (buf->buf[pos] == '\0') {
1.173     schwarze 1365:                r->last->endspan = 2;
                   1366:                goto out;
                   1367:        }
                   1368:
1.238     schwarze 1369:        while (buf->buf[pos] == ' ')
1.173     schwarze 1370:                pos++;
                   1371:
                   1372:        /* An opening brace requests multiline scope. */
1.75      kristaps 1373:
1.238     schwarze 1374:        if (buf->buf[pos] == '\\' && buf->buf[pos + 1] == '{') {
1.75      kristaps 1375:                r->last->endspan = -1;
                   1376:                pos += 2;
1.173     schwarze 1377:                goto out;
1.207     schwarze 1378:        }
1.74      kristaps 1379:
1.77      kristaps 1380:        /*
1.173     schwarze 1381:         * Anything else following the conditional causes
                   1382:         * single-line scope.  Warn if the scope contains
                   1383:         * nothing but trailing whitespace.
1.77      kristaps 1384:         */
                   1385:
1.238     schwarze 1386:        if (buf->buf[pos] == '\0')
1.216     schwarze 1387:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1388:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1389:
1.173     schwarze 1390:        r->last->endspan = 1;
1.74      kristaps 1391:
1.173     schwarze 1392: out:
1.75      kristaps 1393:        *offs = pos;
                   1394:        return(ROFF_RERUN);
1.83      schwarze 1395: }
                   1396:
                   1397: static enum rofferr
1.92      schwarze 1398: roff_ds(ROFF_ARGS)
                   1399: {
1.212     schwarze 1400:        char            *string;
                   1401:        const char      *name;
                   1402:        size_t           namesz;
1.96      kristaps 1403:
                   1404:        /*
1.212     schwarze 1405:         * The first word is the name of the string.
                   1406:         * If it is empty or terminated by an escape sequence,
                   1407:         * abort the `ds' request without defining anything.
1.96      kristaps 1408:         */
1.92      schwarze 1409:
1.238     schwarze 1410:        name = string = buf->buf + pos;
                   1411:        if (*name == '\0')
1.92      schwarze 1412:                return(ROFF_IGN);
                   1413:
1.212     schwarze 1414:        namesz = roff_getname(r, &string, ln, pos);
1.238     schwarze 1415:        if (name[namesz] == '\\')
1.212     schwarze 1416:                return(ROFF_IGN);
                   1417:
                   1418:        /* Read past the initial double-quote, if any. */
1.238     schwarze 1419:        if (*string == '"')
1.92      schwarze 1420:                string++;
                   1421:
1.96      kristaps 1422:        /* The rest is the value. */
1.212     schwarze 1423:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1424:            ROFF_as == tok);
1.92      schwarze 1425:        return(ROFF_IGN);
                   1426: }
                   1427:
1.204     schwarze 1428: /*
                   1429:  * Parse a single operator, one or two characters long.
                   1430:  * If the operator is recognized, return success and advance the
                   1431:  * parse point, else return failure and let the parse point unchanged.
                   1432:  */
                   1433: static int
                   1434: roff_getop(const char *v, int *pos, char *res)
                   1435: {
                   1436:
                   1437:        *res = v[*pos];
                   1438:
                   1439:        switch (*res) {
1.207     schwarze 1440:        case '+':
1.204     schwarze 1441:                /* FALLTHROUGH */
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:                break;
                   1454:        case '<':
                   1455:                switch (v[*pos + 1]) {
1.207     schwarze 1456:                case '=':
1.204     schwarze 1457:                        *res = 'l';
                   1458:                        (*pos)++;
                   1459:                        break;
1.207     schwarze 1460:                case '>':
1.204     schwarze 1461:                        *res = '!';
                   1462:                        (*pos)++;
                   1463:                        break;
1.207     schwarze 1464:                case '?':
1.204     schwarze 1465:                        *res = 'i';
                   1466:                        (*pos)++;
                   1467:                        break;
                   1468:                default:
                   1469:                        break;
                   1470:                }
                   1471:                break;
                   1472:        case '>':
                   1473:                switch (v[*pos + 1]) {
1.207     schwarze 1474:                case '=':
1.204     schwarze 1475:                        *res = 'g';
                   1476:                        (*pos)++;
                   1477:                        break;
1.207     schwarze 1478:                case '?':
1.204     schwarze 1479:                        *res = 'a';
                   1480:                        (*pos)++;
                   1481:                        break;
                   1482:                default:
                   1483:                        break;
                   1484:                }
                   1485:                break;
                   1486:        case '=':
                   1487:                if ('=' == v[*pos + 1])
                   1488:                        (*pos)++;
                   1489:                break;
                   1490:        default:
                   1491:                return(0);
                   1492:        }
                   1493:        (*pos)++;
                   1494:
                   1495:        return(*res);
                   1496: }
                   1497:
                   1498: /*
                   1499:  * Evaluate either a parenthesized numeric expression
                   1500:  * or a single signed integer number.
                   1501:  */
                   1502: static int
1.235     schwarze 1503: roff_evalpar(struct roff *r, int ln,
1.234     kristaps 1504:        const char *v, int *pos, int *res)
1.204     schwarze 1505: {
                   1506:
                   1507:        if ('(' != v[*pos])
                   1508:                return(roff_getnum(v, pos, res));
                   1509:
                   1510:        (*pos)++;
1.234     kristaps 1511:        if ( ! roff_evalnum(r, ln, v, pos, res, 1))
1.204     schwarze 1512:                return(0);
                   1513:
1.206     schwarze 1514:        /*
                   1515:         * Omission of the closing parenthesis
                   1516:         * is an error in validation mode,
                   1517:         * but ignored in evaluation mode.
                   1518:         */
                   1519:
1.204     schwarze 1520:        if (')' == v[*pos])
                   1521:                (*pos)++;
1.206     schwarze 1522:        else if (NULL == res)
                   1523:                return(0);
1.204     schwarze 1524:
                   1525:        return(1);
                   1526: }
                   1527:
                   1528: /*
                   1529:  * Evaluate a complete numeric expression.
                   1530:  * Proceed left to right, there is no concept of precedence.
                   1531:  */
                   1532: static int
1.235     schwarze 1533: roff_evalnum(struct roff *r, int ln, const char *v,
1.234     kristaps 1534:        int *pos, int *res, int skipwhite)
1.204     schwarze 1535: {
                   1536:        int              mypos, operand2;
                   1537:        char             operator;
                   1538:
                   1539:        if (NULL == pos) {
                   1540:                mypos = 0;
                   1541:                pos = &mypos;
                   1542:        }
                   1543:
                   1544:        if (skipwhite)
                   1545:                while (isspace((unsigned char)v[*pos]))
                   1546:                        (*pos)++;
                   1547:
1.234     kristaps 1548:        if ( ! roff_evalpar(r, ln, v, pos, res))
1.204     schwarze 1549:                return(0);
                   1550:
                   1551:        while (1) {
                   1552:                if (skipwhite)
                   1553:                        while (isspace((unsigned char)v[*pos]))
                   1554:                                (*pos)++;
                   1555:
                   1556:                if ( ! roff_getop(v, pos, &operator))
                   1557:                        break;
                   1558:
                   1559:                if (skipwhite)
                   1560:                        while (isspace((unsigned char)v[*pos]))
                   1561:                                (*pos)++;
                   1562:
1.234     kristaps 1563:                if ( ! roff_evalpar(r, ln, v, pos, &operand2))
1.204     schwarze 1564:                        return(0);
                   1565:
                   1566:                if (skipwhite)
                   1567:                        while (isspace((unsigned char)v[*pos]))
                   1568:                                (*pos)++;
1.206     schwarze 1569:
                   1570:                if (NULL == res)
                   1571:                        continue;
1.204     schwarze 1572:
                   1573:                switch (operator) {
1.207     schwarze 1574:                case '+':
1.204     schwarze 1575:                        *res += operand2;
                   1576:                        break;
1.207     schwarze 1577:                case '-':
1.204     schwarze 1578:                        *res -= operand2;
                   1579:                        break;
1.207     schwarze 1580:                case '*':
1.204     schwarze 1581:                        *res *= operand2;
                   1582:                        break;
1.207     schwarze 1583:                case '/':
1.244     schwarze 1584:                        if (operand2 == 0) {
1.235     schwarze 1585:                                mandoc_msg(MANDOCERR_DIVZERO,
1.234     kristaps 1586:                                        r->parse, ln, *pos, v);
                   1587:                                *res = 0;
                   1588:                                break;
                   1589:                        }
1.204     schwarze 1590:                        *res /= operand2;
                   1591:                        break;
1.207     schwarze 1592:                case '%':
1.244     schwarze 1593:                        if (operand2 == 0) {
                   1594:                                mandoc_msg(MANDOCERR_DIVZERO,
                   1595:                                        r->parse, ln, *pos, v);
                   1596:                                *res = 0;
                   1597:                                break;
                   1598:                        }
1.204     schwarze 1599:                        *res %= operand2;
                   1600:                        break;
1.207     schwarze 1601:                case '<':
1.204     schwarze 1602:                        *res = *res < operand2;
                   1603:                        break;
1.207     schwarze 1604:                case '>':
1.204     schwarze 1605:                        *res = *res > operand2;
                   1606:                        break;
1.207     schwarze 1607:                case 'l':
1.204     schwarze 1608:                        *res = *res <= operand2;
                   1609:                        break;
1.207     schwarze 1610:                case 'g':
1.204     schwarze 1611:                        *res = *res >= operand2;
                   1612:                        break;
1.207     schwarze 1613:                case '=':
1.204     schwarze 1614:                        *res = *res == operand2;
                   1615:                        break;
1.207     schwarze 1616:                case '!':
1.204     schwarze 1617:                        *res = *res != operand2;
                   1618:                        break;
1.207     schwarze 1619:                case '&':
1.204     schwarze 1620:                        *res = *res && operand2;
                   1621:                        break;
1.207     schwarze 1622:                case ':':
1.204     schwarze 1623:                        *res = *res || operand2;
                   1624:                        break;
1.207     schwarze 1625:                case 'i':
1.204     schwarze 1626:                        if (operand2 < *res)
                   1627:                                *res = operand2;
                   1628:                        break;
1.207     schwarze 1629:                case 'a':
1.204     schwarze 1630:                        if (operand2 > *res)
                   1631:                                *res = operand2;
                   1632:                        break;
                   1633:                default:
                   1634:                        abort();
                   1635:                }
                   1636:        }
                   1637:        return(1);
                   1638: }
                   1639:
1.180     schwarze 1640: void
1.187     schwarze 1641: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1642: {
1.180     schwarze 1643:        struct roffreg  *reg;
                   1644:
                   1645:        /* Search for an existing register with the same name. */
                   1646:        reg = r->regtab;
                   1647:
                   1648:        while (reg && strcmp(name, reg->key.p))
                   1649:                reg = reg->next;
1.147     kristaps 1650:
1.180     schwarze 1651:        if (NULL == reg) {
                   1652:                /* Create a new register. */
                   1653:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1654:                reg->key.p = mandoc_strdup(name);
                   1655:                reg->key.sz = strlen(name);
1.187     schwarze 1656:                reg->val = 0;
1.180     schwarze 1657:                reg->next = r->regtab;
                   1658:                r->regtab = reg;
                   1659:        }
                   1660:
1.187     schwarze 1661:        if ('+' == sign)
                   1662:                reg->val += val;
                   1663:        else if ('-' == sign)
                   1664:                reg->val -= val;
                   1665:        else
                   1666:                reg->val = val;
1.147     kristaps 1667: }
                   1668:
1.192     schwarze 1669: /*
                   1670:  * Handle some predefined read-only number registers.
                   1671:  * For now, return -1 if the requested register is not predefined;
                   1672:  * in case a predefined read-only register having the value -1
                   1673:  * were to turn up, another special value would have to be chosen.
                   1674:  */
                   1675: static int
                   1676: roff_getregro(const char *name)
                   1677: {
                   1678:
                   1679:        switch (*name) {
1.207     schwarze 1680:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1681:                return(0);
1.207     schwarze 1682:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1683:                return(1);
1.207     schwarze 1684:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1685:                return (24);
1.207     schwarze 1686:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1687:                return(0);
1.207     schwarze 1688:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1689:                return(1);
1.207     schwarze 1690:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1691:                return (40);
                   1692:        default:
                   1693:                return (-1);
                   1694:        }
                   1695: }
                   1696:
1.181     schwarze 1697: int
1.180     schwarze 1698: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1699: {
1.180     schwarze 1700:        struct roffreg  *reg;
1.192     schwarze 1701:        int              val;
                   1702:
                   1703:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1704:                val = roff_getregro(name + 1);
                   1705:                if (-1 != val)
                   1706:                        return (val);
                   1707:        }
1.180     schwarze 1708:
                   1709:        for (reg = r->regtab; reg; reg = reg->next)
                   1710:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1711:                        return(reg->val);
                   1712:
                   1713:        return(0);
                   1714: }
                   1715:
                   1716: static int
                   1717: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1718: {
                   1719:        struct roffreg  *reg;
1.192     schwarze 1720:        int              val;
                   1721:
                   1722:        if ('.' == name[0] && 2 == len) {
                   1723:                val = roff_getregro(name + 1);
                   1724:                if (-1 != val)
                   1725:                        return (val);
                   1726:        }
1.181     schwarze 1727:
                   1728:        for (reg = r->regtab; reg; reg = reg->next)
                   1729:                if (len == reg->key.sz &&
                   1730:                    0 == strncmp(name, reg->key.p, len))
                   1731:                        return(reg->val);
1.147     kristaps 1732:
1.180     schwarze 1733:        return(0);
1.147     kristaps 1734: }
                   1735:
1.180     schwarze 1736: static void
                   1737: roff_freereg(struct roffreg *reg)
1.147     kristaps 1738: {
1.180     schwarze 1739:        struct roffreg  *old_reg;
1.147     kristaps 1740:
1.180     schwarze 1741:        while (NULL != reg) {
                   1742:                free(reg->key.p);
                   1743:                old_reg = reg;
                   1744:                reg = reg->next;
                   1745:                free(old_reg);
                   1746:        }
1.147     kristaps 1747: }
1.92      schwarze 1748:
                   1749: static enum rofferr
1.89      kristaps 1750: roff_nr(ROFF_ARGS)
1.83      schwarze 1751: {
1.212     schwarze 1752:        char            *key, *val;
                   1753:        size_t           keysz;
1.138     kristaps 1754:        int              iv;
1.187     schwarze 1755:        char             sign;
1.89      kristaps 1756:
1.238     schwarze 1757:        key = val = buf->buf + pos;
                   1758:        if (*key == '\0')
1.212     schwarze 1759:                return(ROFF_IGN);
                   1760:
                   1761:        keysz = roff_getname(r, &val, ln, pos);
1.238     schwarze 1762:        if (key[keysz] == '\\')
1.212     schwarze 1763:                return(ROFF_IGN);
                   1764:        key[keysz] = '\0';
1.89      kristaps 1765:
1.187     schwarze 1766:        sign = *val;
1.238     schwarze 1767:        if (sign == '+' || sign == '-')
1.187     schwarze 1768:                val++;
                   1769:
1.234     kristaps 1770:        if (roff_evalnum(r, ln, val, NULL, &iv, 0))
1.204     schwarze 1771:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1772:
1.203     schwarze 1773:        return(ROFF_IGN);
                   1774: }
                   1775:
                   1776: static enum rofferr
                   1777: roff_rr(ROFF_ARGS)
                   1778: {
                   1779:        struct roffreg  *reg, **prev;
1.212     schwarze 1780:        char            *name, *cp;
                   1781:        size_t           namesz;
1.203     schwarze 1782:
1.238     schwarze 1783:        name = cp = buf->buf + pos;
                   1784:        if (*name == '\0')
1.212     schwarze 1785:                return(ROFF_IGN);
                   1786:        namesz = roff_getname(r, &cp, ln, pos);
                   1787:        name[namesz] = '\0';
1.203     schwarze 1788:
                   1789:        prev = &r->regtab;
                   1790:        while (1) {
                   1791:                reg = *prev;
1.238     schwarze 1792:                if (reg == NULL || !strcmp(name, reg->key.p))
1.203     schwarze 1793:                        break;
                   1794:                prev = &reg->next;
                   1795:        }
1.238     schwarze 1796:        if (reg != NULL) {
1.203     schwarze 1797:                *prev = reg->next;
                   1798:                free(reg->key.p);
                   1799:                free(reg);
                   1800:        }
1.122     schwarze 1801:        return(ROFF_IGN);
                   1802: }
                   1803:
                   1804: static enum rofferr
                   1805: roff_rm(ROFF_ARGS)
                   1806: {
                   1807:        const char       *name;
                   1808:        char             *cp;
1.212     schwarze 1809:        size_t            namesz;
1.122     schwarze 1810:
1.238     schwarze 1811:        cp = buf->buf + pos;
                   1812:        while (*cp != '\0') {
1.212     schwarze 1813:                name = cp;
1.238     schwarze 1814:                namesz = roff_getname(r, &cp, ln, (int)(cp - buf->buf));
1.212     schwarze 1815:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
1.238     schwarze 1816:                if (name[namesz] == '\\')
1.212     schwarze 1817:                        break;
1.122     schwarze 1818:        }
1.178     schwarze 1819:        return(ROFF_IGN);
                   1820: }
                   1821:
                   1822: static enum rofferr
                   1823: roff_it(ROFF_ARGS)
                   1824: {
                   1825:        char            *cp;
                   1826:        size_t           len;
                   1827:        int              iv;
                   1828:
                   1829:        /* Parse the number of lines. */
1.238     schwarze 1830:        cp = buf->buf + pos;
1.178     schwarze 1831:        len = strcspn(cp, " \t");
                   1832:        cp[len] = '\0';
                   1833:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
1.222     schwarze 1834:                mandoc_msg(MANDOCERR_IT_NONUM, r->parse,
1.238     schwarze 1835:                    ln, ppos, buf->buf + 1);
1.178     schwarze 1836:                return(ROFF_IGN);
                   1837:        }
                   1838:        cp += len + 1;
                   1839:
                   1840:        /* Arm the input line trap. */
                   1841:        roffit_lines = iv;
                   1842:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1843:        return(ROFF_IGN);
1.175     schwarze 1844: }
                   1845:
                   1846: static enum rofferr
                   1847: roff_Dd(ROFF_ARGS)
                   1848: {
                   1849:        const char *const       *cp;
                   1850:
1.227     schwarze 1851:        if ((r->options & (MPARSE_MDOC | MPARSE_QUICK)) == 0)
1.175     schwarze 1852:                for (cp = __mdoc_reserved; *cp; cp++)
                   1853:                        roff_setstr(r, *cp, NULL, 0);
                   1854:
1.227     schwarze 1855:        if (r->format == 0)
                   1856:                r->format = MPARSE_MDOC;
                   1857:
1.175     schwarze 1858:        return(ROFF_CONT);
                   1859: }
                   1860:
                   1861: static enum rofferr
                   1862: roff_TH(ROFF_ARGS)
                   1863: {
                   1864:        const char *const       *cp;
                   1865:
1.227     schwarze 1866:        if ((r->options & MPARSE_QUICK) == 0)
1.175     schwarze 1867:                for (cp = __man_reserved; *cp; cp++)
                   1868:                        roff_setstr(r, *cp, NULL, 0);
                   1869:
1.227     schwarze 1870:        if (r->format == 0)
                   1871:                r->format = MPARSE_MAN;
                   1872:
1.175     schwarze 1873:        return(ROFF_CONT);
1.109     kristaps 1874: }
                   1875:
                   1876: static enum rofferr
                   1877: roff_TE(ROFF_ARGS)
                   1878: {
                   1879:
                   1880:        if (NULL == r->tbl)
1.221     schwarze 1881:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1882:                    ln, ppos, "TE");
1.115     kristaps 1883:        else
1.151     kristaps 1884:                tbl_end(&r->tbl);
1.109     kristaps 1885:
1.112     kristaps 1886:        return(ROFF_IGN);
                   1887: }
                   1888:
                   1889: static enum rofferr
                   1890: roff_T_(ROFF_ARGS)
                   1891: {
                   1892:
                   1893:        if (NULL == r->tbl)
1.221     schwarze 1894:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1895:                    ln, ppos, "T&");
1.112     kristaps 1896:        else
1.116     kristaps 1897:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1898:
1.109     kristaps 1899:        return(ROFF_IGN);
                   1900: }
                   1901:
1.230     schwarze 1902: /*
                   1903:  * Handle in-line equation delimiters.
                   1904:  */
                   1905: static enum rofferr
1.238     schwarze 1906: roff_eqndelim(struct roff *r, struct buf *buf, int pos)
1.151     kristaps 1907: {
1.233     schwarze 1908:        char            *cp1, *cp2;
                   1909:        const char      *bef_pr, *bef_nl, *mac, *aft_nl, *aft_pr;
1.151     kristaps 1910:
1.230     schwarze 1911:        /*
                   1912:         * Outside equations, look for an opening delimiter.
                   1913:         * If we are inside an equation, we already know it is
                   1914:         * in-line, or this function wouldn't have been called;
                   1915:         * so look for a closing delimiter.
                   1916:         */
                   1917:
1.238     schwarze 1918:        cp1 = buf->buf + pos;
1.230     schwarze 1919:        cp2 = strchr(cp1, r->eqn == NULL ?
                   1920:            r->last_eqn->odelim : r->last_eqn->cdelim);
                   1921:        if (cp2 == NULL)
                   1922:                return(ROFF_CONT);
                   1923:
1.233     schwarze 1924:        *cp2++ = '\0';
                   1925:        bef_pr = bef_nl = aft_nl = aft_pr = "";
                   1926:
                   1927:        /* Handle preceding text, protecting whitespace. */
                   1928:
1.238     schwarze 1929:        if (*buf->buf != '\0') {
1.233     schwarze 1930:                if (r->eqn == NULL)
                   1931:                        bef_pr = "\\&";
                   1932:                bef_nl = "\n";
                   1933:        }
                   1934:
                   1935:        /*
                   1936:         * Prepare replacing the delimiter with an equation macro
                   1937:         * and drop leading white space from the equation.
                   1938:         */
1.230     schwarze 1939:
1.233     schwarze 1940:        if (r->eqn == NULL) {
                   1941:                while (*cp2 == ' ')
                   1942:                        cp2++;
                   1943:                mac = ".EQ";
                   1944:        } else
                   1945:                mac = ".EN";
                   1946:
                   1947:        /* Handle following text, protecting whitespace. */
                   1948:
                   1949:        if (*cp2 != '\0') {
                   1950:                aft_nl = "\n";
                   1951:                if (r->eqn != NULL)
                   1952:                        aft_pr = "\\&";
                   1953:        }
                   1954:
                   1955:        /* Do the actual replacement. */
                   1956:
1.238     schwarze 1957:        buf->sz = mandoc_asprintf(&cp1, "%s%s%s%s%s%s%s", buf->buf,
1.233     schwarze 1958:            bef_pr, bef_nl, mac, aft_nl, aft_pr, cp2) + 1;
1.238     schwarze 1959:        free(buf->buf);
                   1960:        buf->buf = cp1;
1.230     schwarze 1961:
                   1962:        /* Toggle the in-line state of the eqn subsystem. */
                   1963:
                   1964:        r->eqn_inline = r->eqn == NULL;
                   1965:        return(ROFF_REPARSE);
1.151     kristaps 1966: }
                   1967:
1.235     schwarze 1968: static enum rofferr
                   1969: roff_EQ(ROFF_ARGS)
1.125     kristaps 1970: {
1.151     kristaps 1971:        struct eqn_node *e;
1.125     kristaps 1972:
1.238     schwarze 1973:        assert(r->eqn == NULL);
1.235     schwarze 1974:        e = eqn_alloc(ppos, ln, r->parse);
1.125     kristaps 1975:
1.230     schwarze 1976:        if (r->last_eqn) {
1.125     kristaps 1977:                r->last_eqn->next = e;
1.230     schwarze 1978:                e->delim = r->last_eqn->delim;
                   1979:                e->odelim = r->last_eqn->odelim;
                   1980:                e->cdelim = r->last_eqn->cdelim;
                   1981:        } else
1.125     kristaps 1982:                r->first_eqn = r->last_eqn = e;
                   1983:
                   1984:        r->eqn = r->last_eqn = e;
1.151     kristaps 1985:
1.238     schwarze 1986:        if (buf->buf[pos] != '\0')
1.235     schwarze 1987:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
1.238     schwarze 1988:                    ".EQ %s", buf->buf + pos);
1.151     kristaps 1989:
1.125     kristaps 1990:        return(ROFF_IGN);
                   1991: }
                   1992:
                   1993: static enum rofferr
                   1994: roff_EN(ROFF_ARGS)
                   1995: {
                   1996:
1.221     schwarze 1997:        mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse, ln, ppos, "EN");
1.125     kristaps 1998:        return(ROFF_IGN);
                   1999: }
                   2000:
                   2001: static enum rofferr
1.109     kristaps 2002: roff_TS(ROFF_ARGS)
                   2003: {
1.176     schwarze 2004:        struct tbl_node *tbl;
1.89      kristaps 2005:
1.115     kristaps 2006:        if (r->tbl) {
1.221     schwarze 2007:                mandoc_msg(MANDOCERR_BLK_BROKEN, r->parse,
                   2008:                    ln, ppos, "TS breaks TS");
1.151     kristaps 2009:                tbl_end(&r->tbl);
1.115     kristaps 2010:        }
1.83      schwarze 2011:
1.176     schwarze 2012:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 2013:
                   2014:        if (r->last_tbl)
1.176     schwarze 2015:                r->last_tbl->next = tbl;
1.113     kristaps 2016:        else
1.176     schwarze 2017:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 2018:
1.176     schwarze 2019:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 2020:        return(ROFF_IGN);
1.92      schwarze 2021: }
                   2022:
1.105     kristaps 2023: static enum rofferr
1.174     kristaps 2024: roff_cc(ROFF_ARGS)
                   2025: {
                   2026:        const char      *p;
                   2027:
1.238     schwarze 2028:        p = buf->buf + pos;
1.174     kristaps 2029:
1.238     schwarze 2030:        if (*p == '\0' || (r->control = *p++) == '.')
1.174     kristaps 2031:                r->control = 0;
                   2032:
1.238     schwarze 2033:        if (*p != '\0')
1.174     kristaps 2034:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2035:
                   2036:        return(ROFF_IGN);
                   2037: }
                   2038:
                   2039: static enum rofferr
1.164     kristaps 2040: roff_tr(ROFF_ARGS)
                   2041: {
                   2042:        const char      *p, *first, *second;
                   2043:        size_t           fsz, ssz;
                   2044:        enum mandoc_esc  esc;
                   2045:
1.238     schwarze 2046:        p = buf->buf + pos;
1.164     kristaps 2047:
1.238     schwarze 2048:        if (*p == '\0') {
1.164     kristaps 2049:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   2050:                return(ROFF_IGN);
                   2051:        }
                   2052:
1.238     schwarze 2053:        while (*p != '\0') {
1.164     kristaps 2054:                fsz = ssz = 1;
                   2055:
                   2056:                first = p++;
1.238     schwarze 2057:                if (*first == '\\') {
1.164     kristaps 2058:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2059:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2060:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2061:                                    ln, (int)(p - buf->buf), first);
1.164     kristaps 2062:                                return(ROFF_IGN);
                   2063:                        }
                   2064:                        fsz = (size_t)(p - first);
                   2065:                }
                   2066:
                   2067:                second = p++;
1.238     schwarze 2068:                if (*second == '\\') {
1.164     kristaps 2069:                        esc = mandoc_escape(&p, NULL, NULL);
1.238     schwarze 2070:                        if (esc == ESCAPE_ERROR) {
1.219     schwarze 2071:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
1.238     schwarze 2072:                                    ln, (int)(p - buf->buf), second);
1.164     kristaps 2073:                                return(ROFF_IGN);
                   2074:                        }
                   2075:                        ssz = (size_t)(p - second);
1.238     schwarze 2076:                } else if (*second == '\0') {
1.207     schwarze 2077:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
1.238     schwarze 2078:                            ln, (int)(p - buf->buf), NULL);
1.164     kristaps 2079:                        second = " ";
1.165     kristaps 2080:                        p--;
1.164     kristaps 2081:                }
                   2082:
1.167     kristaps 2083:                if (fsz > 1) {
1.207     schwarze 2084:                        roff_setstrn(&r->xmbtab, first, fsz,
                   2085:                            second, ssz, 0);
1.167     kristaps 2086:                        continue;
                   2087:                }
                   2088:
1.238     schwarze 2089:                if (r->xtab == NULL)
1.207     schwarze 2090:                        r->xtab = mandoc_calloc(128,
                   2091:                            sizeof(struct roffstr));
1.167     kristaps 2092:
                   2093:                free(r->xtab[(int)*first].p);
                   2094:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   2095:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 2096:        }
                   2097:
                   2098:        return(ROFF_IGN);
                   2099: }
                   2100:
                   2101: static enum rofferr
1.105     kristaps 2102: roff_so(ROFF_ARGS)
                   2103: {
                   2104:        char *name;
                   2105:
1.238     schwarze 2106:        name = buf->buf + pos;
1.224     schwarze 2107:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, "so %s", name);
1.105     kristaps 2108:
                   2109:        /*
                   2110:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   2111:         * opening anything that's not in our cwd or anything beneath
                   2112:         * it.  Thus, explicitly disallow traversing up the file-system
                   2113:         * or using absolute paths.
                   2114:         */
                   2115:
1.238     schwarze 2116:        if (*name == '/' || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 2117:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   2118:                    ".so %s", name);
1.105     kristaps 2119:                return(ROFF_ERR);
                   2120:        }
                   2121:
                   2122:        *offs = pos;
                   2123:        return(ROFF_SO);
                   2124: }
1.92      schwarze 2125:
1.106     kristaps 2126: static enum rofferr
                   2127: roff_userdef(ROFF_ARGS)
1.99      kristaps 2128: {
1.106     kristaps 2129:        const char       *arg[9];
                   2130:        char             *cp, *n1, *n2;
1.119     schwarze 2131:        int               i;
1.106     kristaps 2132:
                   2133:        /*
                   2134:         * Collect pointers to macro argument strings
1.188     schwarze 2135:         * and NUL-terminate them.
1.106     kristaps 2136:         */
1.238     schwarze 2137:        cp = buf->buf + pos;
1.119     schwarze 2138:        for (i = 0; i < 9; i++)
1.238     schwarze 2139:                arg[i] = *cp == '\0' ? "" :
1.136     kristaps 2140:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 2141:
1.106     kristaps 2142:        /*
                   2143:         * Expand macro arguments.
1.99      kristaps 2144:         */
1.238     schwarze 2145:        buf->sz = 0;
1.106     kristaps 2146:        n1 = cp = mandoc_strdup(r->current_string);
1.238     schwarze 2147:        while ((cp = strstr(cp, "\\$")) != NULL) {
1.106     kristaps 2148:                i = cp[2] - '1';
                   2149:                if (0 > i || 8 < i) {
                   2150:                        /* Not an argument invocation. */
                   2151:                        cp += 2;
                   2152:                        continue;
                   2153:                }
1.209     schwarze 2154:                *cp = '\0';
1.238     schwarze 2155:                buf->sz = mandoc_asprintf(&n2, "%s%s%s",
1.209     schwarze 2156:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 2157:                cp = n2 + (cp - n1);
                   2158:                free(n1);
                   2159:                n1 = n2;
1.99      kristaps 2160:        }
                   2161:
1.106     kristaps 2162:        /*
                   2163:         * Replace the macro invocation
                   2164:         * by the expanded macro.
                   2165:         */
1.238     schwarze 2166:        free(buf->buf);
                   2167:        buf->buf = n1;
                   2168:        if (buf->sz == 0)
                   2169:                buf->sz = strlen(buf->buf) + 1;
1.106     kristaps 2170:
1.238     schwarze 2171:        return(buf->sz > 1 && buf->buf[buf->sz - 2] == '\n' ?
1.106     kristaps 2172:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2173: }
1.121     schwarze 2174:
1.212     schwarze 2175: static size_t
1.121     schwarze 2176: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2177: {
                   2178:        char     *name, *cp;
1.212     schwarze 2179:        size_t    namesz;
1.121     schwarze 2180:
                   2181:        name = *cpp;
                   2182:        if ('\0' == *name)
1.212     schwarze 2183:                return(0);
1.121     schwarze 2184:
1.212     schwarze 2185:        /* Read until end of name and terminate it with NUL. */
                   2186:        for (cp = name; 1; cp++) {
                   2187:                if ('\0' == *cp || ' ' == *cp) {
                   2188:                        namesz = cp - name;
                   2189:                        break;
                   2190:                }
1.121     schwarze 2191:                if ('\\' != *cp)
                   2192:                        continue;
1.215     schwarze 2193:                namesz = cp - name;
                   2194:                if ('{' == cp[1] || '}' == cp[1])
                   2195:                        break;
1.121     schwarze 2196:                cp++;
                   2197:                if ('\\' == *cp)
                   2198:                        continue;
1.224     schwarze 2199:                mandoc_vmsg(MANDOCERR_NAMESC, r->parse, ln, pos,
                   2200:                    "%.*s", (int)(cp - name + 1), name);
1.212     schwarze 2201:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2202:                break;
1.121     schwarze 2203:        }
                   2204:
                   2205:        /* Read past spaces. */
                   2206:        while (' ' == *cp)
                   2207:                cp++;
                   2208:
                   2209:        *cpp = cp;
1.212     schwarze 2210:        return(namesz);
1.121     schwarze 2211: }
                   2212:
1.106     kristaps 2213: /*
                   2214:  * Store *string into the user-defined string called *name.
                   2215:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2216:  * append == 0: replace mode
                   2217:  * append == 1: single-line append mode
                   2218:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2219:  */
1.94      kristaps 2220: static void
1.106     kristaps 2221: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2222:        int append)
1.92      schwarze 2223: {
1.164     kristaps 2224:
                   2225:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2226:            string ? strlen(string) : 0, append);
1.164     kristaps 2227: }
                   2228:
                   2229: static void
1.166     kristaps 2230: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2231:                const char *string, size_t stringsz, int append)
1.164     kristaps 2232: {
1.166     kristaps 2233:        struct roffkv   *n;
1.164     kristaps 2234:        char            *c;
                   2235:        int              i;
                   2236:        size_t           oldch, newch;
1.92      schwarze 2237:
1.106     kristaps 2238:        /* Search for an existing string with the same name. */
1.164     kristaps 2239:        n = *r;
                   2240:
1.211     schwarze 2241:        while (n && (namesz != n->key.sz ||
                   2242:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2243:                n = n->next;
1.94      kristaps 2244:
                   2245:        if (NULL == n) {
1.106     kristaps 2246:                /* Create a new string table entry. */
1.166     kristaps 2247:                n = mandoc_malloc(sizeof(struct roffkv));
                   2248:                n->key.p = mandoc_strndup(name, namesz);
                   2249:                n->key.sz = namesz;
                   2250:                n->val.p = NULL;
                   2251:                n->val.sz = 0;
1.164     kristaps 2252:                n->next = *r;
                   2253:                *r = n;
1.193     schwarze 2254:        } else if (0 == append) {
1.166     kristaps 2255:                free(n->val.p);
                   2256:                n->val.p = NULL;
                   2257:                n->val.sz = 0;
1.106     kristaps 2258:        }
                   2259:
                   2260:        if (NULL == string)
                   2261:                return;
                   2262:
                   2263:        /*
                   2264:         * One additional byte for the '\n' in multiline mode,
                   2265:         * and one for the terminating '\0'.
                   2266:         */
1.193     schwarze 2267:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2268:
1.166     kristaps 2269:        if (NULL == n->val.p) {
                   2270:                n->val.p = mandoc_malloc(newch);
                   2271:                *n->val.p = '\0';
1.106     kristaps 2272:                oldch = 0;
                   2273:        } else {
1.166     kristaps 2274:                oldch = n->val.sz;
                   2275:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2276:        }
                   2277:
                   2278:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2279:        c = n->val.p + (int)oldch;
1.106     kristaps 2280:
                   2281:        /* Append new content to the destination buffer. */
1.164     kristaps 2282:        i = 0;
                   2283:        while (i < (int)stringsz) {
1.106     kristaps 2284:                /*
                   2285:                 * Rudimentary roff copy mode:
                   2286:                 * Handle escaped backslashes.
                   2287:                 */
1.164     kristaps 2288:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2289:                        i++;
                   2290:                *c++ = string[i++];
1.106     kristaps 2291:        }
1.94      kristaps 2292:
1.106     kristaps 2293:        /* Append terminating bytes. */
1.193     schwarze 2294:        if (1 < append)
1.106     kristaps 2295:                *c++ = '\n';
1.163     kristaps 2296:
1.106     kristaps 2297:        *c = '\0';
1.166     kristaps 2298:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2299: }
                   2300:
1.94      kristaps 2301: static const char *
                   2302: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2303: {
1.166     kristaps 2304:        const struct roffkv *n;
1.191     schwarze 2305:        int i;
1.92      schwarze 2306:
1.164     kristaps 2307:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2308:                if (0 == strncmp(name, n->key.p, len) &&
                   2309:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2310:                        return(n->val.p);
1.191     schwarze 2311:
                   2312:        for (i = 0; i < PREDEFS_MAX; i++)
                   2313:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2314:                                '\0' == predefs[i].name[(int)len])
                   2315:                        return(predefs[i].str);
1.94      kristaps 2316:
1.157     kristaps 2317:        return(NULL);
1.92      schwarze 2318: }
                   2319:
1.94      kristaps 2320: static void
1.167     kristaps 2321: roff_freestr(struct roffkv *r)
1.92      schwarze 2322: {
1.166     kristaps 2323:        struct roffkv    *n, *nn;
1.92      schwarze 2324:
1.167     kristaps 2325:        for (n = r; n; n = nn) {
1.166     kristaps 2326:                free(n->key.p);
                   2327:                free(n->val.p);
1.92      schwarze 2328:                nn = n->next;
                   2329:                free(n);
                   2330:        }
1.114     kristaps 2331: }
                   2332:
                   2333: const struct tbl_span *
                   2334: roff_span(const struct roff *r)
                   2335: {
1.207     schwarze 2336:
1.114     kristaps 2337:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2338: }
                   2339:
                   2340: const struct eqn *
                   2341: roff_eqn(const struct roff *r)
                   2342: {
1.207     schwarze 2343:
1.125     kristaps 2344:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2345: }
                   2346:
                   2347: /*
                   2348:  * Duplicate an input string, making the appropriate character
                   2349:  * conversations (as stipulated by `tr') along the way.
                   2350:  * Returns a heap-allocated string with all the replacements made.
                   2351:  */
                   2352: char *
                   2353: roff_strdup(const struct roff *r, const char *p)
                   2354: {
1.166     kristaps 2355:        const struct roffkv *cp;
1.164     kristaps 2356:        char            *res;
                   2357:        const char      *pp;
                   2358:        size_t           ssz, sz;
                   2359:        enum mandoc_esc  esc;
                   2360:
1.167     kristaps 2361:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2362:                return(mandoc_strdup(p));
                   2363:        else if ('\0' == *p)
                   2364:                return(mandoc_strdup(""));
                   2365:
                   2366:        /*
                   2367:         * Step through each character looking for term matches
                   2368:         * (remember that a `tr' can be invoked with an escape, which is
                   2369:         * a glyph but the escape is multi-character).
                   2370:         * We only do this if the character hash has been initialised
                   2371:         * and the string is >0 length.
                   2372:         */
                   2373:
                   2374:        res = NULL;
                   2375:        ssz = 0;
                   2376:
                   2377:        while ('\0' != *p) {
1.167     kristaps 2378:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2379:                        sz = r->xtab[(int)*p].sz;
                   2380:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2381:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2382:                        ssz += sz;
                   2383:                        p++;
                   2384:                        continue;
                   2385:                } else if ('\\' != *p) {
                   2386:                        res = mandoc_realloc(res, ssz + 2);
                   2387:                        res[ssz++] = *p++;
                   2388:                        continue;
                   2389:                }
                   2390:
1.164     kristaps 2391:                /* Search for term matches. */
1.167     kristaps 2392:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2393:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2394:                                break;
                   2395:
                   2396:                if (NULL != cp) {
                   2397:                        /*
                   2398:                         * A match has been found.
                   2399:                         * Append the match to the array and move
                   2400:                         * forward by its keysize.
                   2401:                         */
1.207     schwarze 2402:                        res = mandoc_realloc(res,
                   2403:                            ssz + cp->val.sz + 1);
1.166     kristaps 2404:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2405:                        ssz += cp->val.sz;
                   2406:                        p += (int)cp->key.sz;
1.164     kristaps 2407:                        continue;
                   2408:                }
                   2409:
1.167     kristaps 2410:                /*
                   2411:                 * Handle escapes carefully: we need to copy
                   2412:                 * over just the escape itself, or else we might
                   2413:                 * do replacements within the escape itself.
                   2414:                 * Make sure to pass along the bogus string.
                   2415:                 */
                   2416:                pp = p++;
                   2417:                esc = mandoc_escape(&p, NULL, NULL);
                   2418:                if (ESCAPE_ERROR == esc) {
                   2419:                        sz = strlen(pp);
1.164     kristaps 2420:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2421:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2422:                        break;
1.164     kristaps 2423:                }
1.207     schwarze 2424:                /*
                   2425:                 * We bail out on bad escapes.
1.167     kristaps 2426:                 * No need to warn: we already did so when
                   2427:                 * roff_res() was called.
                   2428:                 */
                   2429:                sz = (int)(p - pp);
                   2430:                res = mandoc_realloc(res, ssz + sz + 1);
                   2431:                memcpy(res + ssz, pp, sz);
                   2432:                ssz += sz;
1.164     kristaps 2433:        }
                   2434:
                   2435:        res[(int)ssz] = '\0';
                   2436:        return(res);
1.227     schwarze 2437: }
                   2438:
                   2439: int
                   2440: roff_getformat(const struct roff *r)
                   2441: {
                   2442:
                   2443:        return(r->format);
1.174     kristaps 2444: }
                   2445:
                   2446: /*
1.207     schwarze 2447:  * Find out whether a line is a macro line or not.
1.174     kristaps 2448:  * If it is, adjust the current position and return one; if it isn't,
                   2449:  * return zero and don't change the current position.
                   2450:  * If the control character has been set with `.cc', then let that grain
                   2451:  * precedence.
                   2452:  * This is slighly contrary to groff, where using the non-breaking
                   2453:  * control character when `cc' has been invoked will cause the
                   2454:  * non-breaking macro contents to be printed verbatim.
                   2455:  */
                   2456: int
                   2457: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2458: {
                   2459:        int             pos;
                   2460:
                   2461:        pos = *ppos;
                   2462:
                   2463:        if (0 != r->control && cp[pos] == r->control)
                   2464:                pos++;
                   2465:        else if (0 != r->control)
                   2466:                return(0);
                   2467:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2468:                pos += 2;
                   2469:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2470:                pos++;
                   2471:        else
                   2472:                return(0);
                   2473:
                   2474:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2475:                pos++;
                   2476:
                   2477:        *ppos = pos;
                   2478:        return(1);
1.74      kristaps 2479: }

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