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Annotation of mandoc/roff.c, Revision 1.153

1.153   ! kristaps    1: /*     $Id: roff.c,v 1.152 2011/07/26 14:09:01 kristaps Exp $ */
1.1       kristaps    2: /*
1.119     schwarze    3:  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
                      4:  * Copyright (c) 2010, 2011 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: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
                     20: #endif
1.30      kristaps   21:
1.67      kristaps   22: #include <assert.h>
1.85      kristaps   23: #include <ctype.h>
1.1       kristaps   24: #include <stdlib.h>
1.67      kristaps   25: #include <string.h>
1.1       kristaps   26:
1.67      kristaps   27: #include "mandoc.h"
1.109     kristaps   28: #include "libroff.h"
1.94      kristaps   29: #include "libmandoc.h"
1.33      kristaps   30:
1.141     kristaps   31: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   32: #define        RSTACK_MAX      128
                     33:
1.67      kristaps   34: enum   rofft {
1.103     kristaps   35:        ROFF_ad,
1.80      kristaps   36:        ROFF_am,
                     37:        ROFF_ami,
                     38:        ROFF_am1,
                     39:        ROFF_de,
                     40:        ROFF_dei,
                     41:        ROFF_de1,
1.83      schwarze   42:        ROFF_ds,
1.82      kristaps   43:        ROFF_el,
1.103     kristaps   44:        ROFF_hy,
1.82      kristaps   45:        ROFF_ie,
1.75      kristaps   46:        ROFF_if,
1.76      kristaps   47:        ROFF_ig,
1.123     schwarze   48:        ROFF_it,
1.103     kristaps   49:        ROFF_ne,
                     50:        ROFF_nh,
1.104     kristaps   51:        ROFF_nr,
1.124     schwarze   52:        ROFF_ns,
                     53:        ROFF_ps,
1.83      schwarze   54:        ROFF_rm,
1.105     kristaps   55:        ROFF_so,
1.124     schwarze   56:        ROFF_ta,
1.83      schwarze   57:        ROFF_tr,
1.109     kristaps   58:        ROFF_TS,
                     59:        ROFF_TE,
1.112     kristaps   60:        ROFF_T_,
1.125     kristaps   61:        ROFF_EQ,
                     62:        ROFF_EN,
1.76      kristaps   63:        ROFF_cblock,
1.141     kristaps   64:        ROFF_ccond,
1.106     kristaps   65:        ROFF_USERDEF,
1.67      kristaps   66:        ROFF_MAX
                     67: };
                     68:
1.82      kristaps   69: enum   roffrule {
                     70:        ROFFRULE_ALLOW,
                     71:        ROFFRULE_DENY
                     72: };
                     73:
1.147     kristaps   74: /*
                     75:  * A single register entity.  If "set" is zero, the value of the
                     76:  * register should be the default one, which is per-register.
                     77:  * Registers are assumed to be unsigned ints for now.
                     78:  */
                     79: struct reg {
                     80:        int               set; /* whether set or not */
                     81:        unsigned int      u; /* unsigned integer */
                     82: };
                     83:
1.94      kristaps   84: struct roffstr {
                     85:        char            *name; /* key of symbol */
                     86:        char            *string; /* current value */
                     87:        struct roffstr  *next; /* next in list */
                     88: };
                     89:
1.67      kristaps   90: struct roff {
1.128     kristaps   91:        struct mparse   *parse; /* parse point */
1.67      kristaps   92:        struct roffnode *last; /* leaf of stack */
1.82      kristaps   93:        enum roffrule    rstack[RSTACK_MAX]; /* stack of !`ie' rules */
                     94:        int              rstackpos; /* position in rstack */
1.147     kristaps   95:        struct reg       regs[REG__MAX];
1.106     kristaps   96:        struct roffstr  *first_string; /* user-defined strings & macros */
                     97:        const char      *current_string; /* value of last called user macro */
1.118     kristaps   98:        struct tbl_node *first_tbl; /* first table parsed */
                     99:        struct tbl_node *last_tbl; /* last table parsed */
                    100:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  101:        struct eqn_node *last_eqn; /* last equation parsed */
                    102:        struct eqn_node *first_eqn; /* first equation parsed */
                    103:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  104: };
                    105:
1.67      kristaps  106: struct roffnode {
                    107:        enum rofft       tok; /* type of node */
                    108:        struct roffnode *parent; /* up one in stack */
                    109:        int              line; /* parse line */
                    110:        int              col; /* parse col */
1.106     kristaps  111:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  112:        char            *end; /* end-rules: custom token */
                    113:        int              endspan; /* end-rules: next-line or infty */
1.82      kristaps  114:        enum roffrule    rule; /* current evaluation rule */
1.67      kristaps  115: };
                    116:
                    117: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  118:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  119:                         char **bufp, /* input buffer */ \
                    120:                         size_t *szp, /* size of input buffer */ \
                    121:                         int ln, /* parse line */ \
1.75      kristaps  122:                         int ppos, /* original pos in buffer */ \
                    123:                         int pos, /* current pos in buffer */ \
1.74      kristaps  124:                         int *offs /* reset offset of buffer data */
1.67      kristaps  125:
                    126: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    127:
                    128: struct roffmac {
                    129:        const char      *name; /* macro name */
1.79      kristaps  130:        roffproc         proc; /* process new macro */
                    131:        roffproc         text; /* process as child text of macro */
                    132:        roffproc         sub; /* process as child of macro */
                    133:        int              flags;
                    134: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  135:        struct roffmac  *next;
1.67      kristaps  136: };
                    137:
1.141     kristaps  138: struct predef {
                    139:        const char      *name; /* predefined input name */
                    140:        const char      *str; /* replacement symbol */
                    141: };
                    142:
                    143: #define        PREDEF(__name, __str) \
                    144:        { (__name), (__str) },
                    145:
1.80      kristaps  146: static enum rofferr     roff_block(ROFF_ARGS);
                    147: static enum rofferr     roff_block_text(ROFF_ARGS);
                    148: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    149: static enum rofferr     roff_cblock(ROFF_ARGS);
                    150: static enum rofferr     roff_ccond(ROFF_ARGS);
1.82      kristaps  151: static enum rofferr     roff_cond(ROFF_ARGS);
                    152: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    153: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  154: static enum rofferr     roff_ds(ROFF_ARGS);
1.94      kristaps  155: static enum roffrule    roff_evalcond(const char *, int *);
                    156: static void             roff_freestr(struct roff *);
1.121     schwarze  157: static char            *roff_getname(struct roff *, char **, int, int);
1.94      kristaps  158: static const char      *roff_getstrn(const struct roff *,
                    159:                                const char *, size_t);
1.103     kristaps  160: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  161: static enum rofferr     roff_nr(ROFF_ARGS);
1.95      kristaps  162: static int              roff_res(struct roff *,
1.142     kristaps  163:                                char **, size_t *, int, int);
1.122     schwarze  164: static enum rofferr     roff_rm(ROFF_ARGS);
1.94      kristaps  165: static void             roff_setstr(struct roff *,
1.106     kristaps  166:                                const char *, const char *, int);
1.105     kristaps  167: static enum rofferr     roff_so(ROFF_ARGS);
1.109     kristaps  168: static enum rofferr     roff_TE(ROFF_ARGS);
                    169: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  170: static enum rofferr     roff_EQ(ROFF_ARGS);
                    171: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  172: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  173: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  174:
1.85      kristaps  175: /* See roff_hash_find() */
                    176:
                    177: #define        ASCII_HI         126
                    178: #define        ASCII_LO         33
                    179: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    180:
                    181: static struct roffmac  *hash[HASHWIDTH];
                    182:
                    183: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  184:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  185:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    186:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    187:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    188:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    189:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    190:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  191:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  192:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.103     kristaps  193:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  194:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    195:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    196:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.123     schwarze  197:        { "it", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  198:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    199:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  200:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  201:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    202:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  203:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.105     kristaps  204:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  205:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  206:        { "tr", roff_line_ignore, NULL, NULL, 0, NULL },
1.109     kristaps  207:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    208:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  209:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  210:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    211:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  212:        { ".", roff_cblock, NULL, NULL, 0, NULL },
                    213:        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106     kristaps  214:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  215: };
                    216:
1.141     kristaps  217: /* Array of injected predefined strings. */
                    218: #define        PREDEFS_MAX      38
                    219: static const struct predef predefs[PREDEFS_MAX] = {
                    220: #include "predefs.in"
                    221: };
                    222:
1.67      kristaps  223: static void             roff_free1(struct roff *);
1.106     kristaps  224: static enum rofft       roff_hash_find(const char *, size_t);
1.85      kristaps  225: static void             roff_hash_init(void);
1.76      kristaps  226: static void             roffnode_cleanscope(struct roff *);
1.106     kristaps  227: static void             roffnode_push(struct roff *, enum rofft,
                    228:                                const char *, int, int);
1.67      kristaps  229: static void             roffnode_pop(struct roff *);
1.106     kristaps  230: static enum rofft       roff_parse(struct roff *, const char *, int *);
1.67      kristaps  231:
1.85      kristaps  232: /* See roff_hash_find() */
                    233: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    234:
                    235: static void
                    236: roff_hash_init(void)
                    237: {
                    238:        struct roffmac   *n;
                    239:        int               buc, i;
                    240:
1.106     kristaps  241:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  242:                assert(roffs[i].name[0] >= ASCII_LO);
                    243:                assert(roffs[i].name[0] <= ASCII_HI);
                    244:
                    245:                buc = ROFF_HASH(roffs[i].name);
                    246:
                    247:                if (NULL != (n = hash[buc])) {
                    248:                        for ( ; n->next; n = n->next)
                    249:                                /* Do nothing. */ ;
                    250:                        n->next = &roffs[i];
                    251:                } else
                    252:                        hash[buc] = &roffs[i];
                    253:        }
                    254: }
                    255:
1.67      kristaps  256: /*
                    257:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    258:  * the nil-terminated string name could be found.
                    259:  */
                    260: static enum rofft
1.106     kristaps  261: roff_hash_find(const char *p, size_t s)
1.67      kristaps  262: {
1.85      kristaps  263:        int              buc;
                    264:        struct roffmac  *n;
1.67      kristaps  265:
1.85      kristaps  266:        /*
                    267:         * libroff has an extremely simple hashtable, for the time
                    268:         * being, which simply keys on the first character, which must
                    269:         * be printable, then walks a chain.  It works well enough until
                    270:         * optimised.
                    271:         */
                    272:
                    273:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    274:                return(ROFF_MAX);
                    275:
                    276:        buc = ROFF_HASH(p);
                    277:
                    278:        if (NULL == (n = hash[buc]))
                    279:                return(ROFF_MAX);
                    280:        for ( ; n; n = n->next)
1.106     kristaps  281:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  282:                        return((enum rofft)(n - roffs));
1.67      kristaps  283:
                    284:        return(ROFF_MAX);
                    285: }
                    286:
                    287:
                    288: /*
                    289:  * Pop the current node off of the stack of roff instructions currently
                    290:  * pending.
                    291:  */
                    292: static void
                    293: roffnode_pop(struct roff *r)
                    294: {
                    295:        struct roffnode *p;
                    296:
1.75      kristaps  297:        assert(r->last);
                    298:        p = r->last;
1.82      kristaps  299:
1.75      kristaps  300:        r->last = r->last->parent;
1.106     kristaps  301:        free(p->name);
                    302:        free(p->end);
1.67      kristaps  303:        free(p);
                    304: }
                    305:
                    306:
                    307: /*
                    308:  * Push a roff node onto the instruction stack.  This must later be
                    309:  * removed with roffnode_pop().
                    310:  */
1.98      schwarze  311: static void
1.106     kristaps  312: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    313:                int line, int col)
1.67      kristaps  314: {
                    315:        struct roffnode *p;
                    316:
1.98      schwarze  317:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  318:        p->tok = tok;
1.106     kristaps  319:        if (name)
                    320:                p->name = mandoc_strdup(name);
1.67      kristaps  321:        p->parent = r->last;
                    322:        p->line = line;
                    323:        p->col = col;
1.79      kristaps  324:        p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67      kristaps  325:
                    326:        r->last = p;
                    327: }
                    328:
                    329:
                    330: static void
                    331: roff_free1(struct roff *r)
                    332: {
1.118     kristaps  333:        struct tbl_node *t;
1.125     kristaps  334:        struct eqn_node *e;
1.67      kristaps  335:
1.125     kristaps  336:        while (NULL != (t = r->first_tbl)) {
1.113     kristaps  337:                r->first_tbl = t->next;
                    338:                tbl_free(t);
1.109     kristaps  339:        }
                    340:
1.113     kristaps  341:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    342:
1.125     kristaps  343:        while (NULL != (e = r->first_eqn)) {
                    344:                r->first_eqn = e->next;
                    345:                eqn_free(e);
                    346:        }
                    347:
                    348:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    349:
1.67      kristaps  350:        while (r->last)
                    351:                roffnode_pop(r);
1.109     kristaps  352:
1.94      kristaps  353:        roff_freestr(r);
1.67      kristaps  354: }
                    355:
                    356:
                    357: void
                    358: roff_reset(struct roff *r)
                    359: {
1.143     kristaps  360:        int              i;
1.67      kristaps  361:
                    362:        roff_free1(r);
1.143     kristaps  363:
1.147     kristaps  364:        memset(&r->regs, 0, sizeof(struct reg) * REG__MAX);
                    365:
1.143     kristaps  366:        for (i = 0; i < PREDEFS_MAX; i++)
                    367:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
1.67      kristaps  368: }
                    369:
                    370:
                    371: void
                    372: roff_free(struct roff *r)
                    373: {
                    374:
                    375:        roff_free1(r);
                    376:        free(r);
                    377: }
                    378:
                    379:
                    380: struct roff *
1.147     kristaps  381: roff_alloc(struct mparse *parse)
1.67      kristaps  382: {
                    383:        struct roff     *r;
1.141     kristaps  384:        int              i;
1.67      kristaps  385:
1.98      schwarze  386:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  387:        r->parse = parse;
1.82      kristaps  388:        r->rstackpos = -1;
1.85      kristaps  389:
                    390:        roff_hash_init();
1.141     kristaps  391:
                    392:        for (i = 0; i < PREDEFS_MAX; i++)
                    393:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
                    394:
1.67      kristaps  395:        return(r);
                    396: }
                    397:
1.94      kristaps  398: /*
                    399:  * Pre-filter each and every line for reserved words (one beginning with
                    400:  * `\*', e.g., `\*(ab').  These must be handled before the actual line
                    401:  * is processed.
1.153   ! kristaps  402:  * This also checks the syntax of regular escapes.
        !           403: */
1.94      kristaps  404: static int
1.142     kristaps  405: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  406: {
1.152     kristaps  407:        enum mandoc_esc  esc;
1.108     schwarze  408:        const char      *stesc; /* start of an escape sequence ('\\') */
                    409:        const char      *stnam; /* start of the name, after "[(*" */
                    410:        const char      *cp;    /* end of the name, e.g. before ']' */
                    411:        const char      *res;   /* the string to be substituted */
1.94      kristaps  412:        int              i, maxl;
                    413:        size_t           nsz;
                    414:        char            *n;
                    415:
1.108     schwarze  416:        /* Search for a leading backslash and save a pointer to it. */
                    417:
                    418:        cp = *bufp + pos;
                    419:        while (NULL != (cp = strchr(cp, '\\'))) {
                    420:                stesc = cp++;
                    421:
                    422:                /*
                    423:                 * The second character must be an asterisk.
                    424:                 * If it isn't, skip it anyway:  It is escaped,
                    425:                 * so it can't start another escape sequence.
                    426:                 */
                    427:
                    428:                if ('\0' == *cp)
                    429:                        return(1);
1.152     kristaps  430:
                    431:                if ('*' != *cp) {
                    432:                        res = cp;
                    433:                        esc = mandoc_escape(&cp, NULL, NULL);
                    434:                        if (ESCAPE_ERROR != esc)
                    435:                                continue;
                    436:                        cp = res;
1.153   ! kristaps  437:                        mandoc_msg
        !           438:                                (MANDOCERR_BADESCAPE, r->parse,
        !           439:                                 ln, (int)(stesc - *bufp), NULL);
1.108     schwarze  440:                        continue;
1.152     kristaps  441:                }
                    442:
                    443:                cp++;
1.108     schwarze  444:
                    445:                /*
                    446:                 * The third character decides the length
                    447:                 * of the name of the string.
                    448:                 * Save a pointer to the name.
                    449:                 */
                    450:
1.94      kristaps  451:                switch (*cp) {
1.108     schwarze  452:                case ('\0'):
                    453:                        return(1);
1.94      kristaps  454:                case ('('):
                    455:                        cp++;
                    456:                        maxl = 2;
                    457:                        break;
                    458:                case ('['):
                    459:                        cp++;
                    460:                        maxl = 0;
                    461:                        break;
                    462:                default:
                    463:                        maxl = 1;
                    464:                        break;
                    465:                }
1.108     schwarze  466:                stnam = cp;
1.94      kristaps  467:
1.108     schwarze  468:                /* Advance to the end of the name. */
1.94      kristaps  469:
                    470:                for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
1.153   ! kristaps  471:                        if ('\0' == *cp) {
        !           472:                                mandoc_msg
        !           473:                                        (MANDOCERR_BADESCAPE,
        !           474:                                         r->parse, ln,
        !           475:                                         (int)(stesc - *bufp), NULL);
        !           476:                                return(1);
        !           477:                        }
1.94      kristaps  478:                        if (0 == maxl && ']' == *cp)
                    479:                                break;
                    480:                }
                    481:
1.108     schwarze  482:                /*
                    483:                 * Retrieve the replacement string; if it is
                    484:                 * undefined, resume searching for escapes.
                    485:                 */
                    486:
                    487:                res = roff_getstrn(r, stnam, (size_t)i);
1.94      kristaps  488:
                    489:                if (NULL == res) {
1.153   ! kristaps  490:                        mandoc_msg
        !           491:                                (MANDOCERR_BADESCAPE, r->parse,
        !           492:                                 ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  493:                        res = "";
1.94      kristaps  494:                }
                    495:
1.108     schwarze  496:                /* Replace the escape sequence by the string. */
                    497:
1.94      kristaps  498:                nsz = *szp + strlen(res) + 1;
                    499:                n = mandoc_malloc(nsz);
                    500:
1.108     schwarze  501:                strlcpy(n, *bufp, (size_t)(stesc - *bufp + 1));
1.94      kristaps  502:                strlcat(n, res, nsz);
                    503:                strlcat(n, cp + (maxl ? 0 : 1), nsz);
                    504:
                    505:                free(*bufp);
                    506:
                    507:                *bufp = n;
                    508:                *szp = nsz;
                    509:                return(0);
                    510:        }
                    511:
                    512:        return(1);
                    513: }
                    514:
1.67      kristaps  515: enum rofferr
1.90      kristaps  516: roff_parseln(struct roff *r, int ln, char **bufp,
                    517:                size_t *szp, int pos, int *offs)
1.67      kristaps  518: {
                    519:        enum rofft       t;
1.109     kristaps  520:        enum rofferr     e;
1.130     kristaps  521:        int              ppos, ctl;
1.79      kristaps  522:
                    523:        /*
1.94      kristaps  524:         * Run the reserved-word filter only if we have some reserved
                    525:         * words to fill in.
                    526:         */
                    527:
1.153   ! kristaps  528:        if ( ! roff_res(r, bufp, szp, ln, pos))
1.106     kristaps  529:                return(ROFF_REPARSE);
1.94      kristaps  530:
1.130     kristaps  531:        ppos = pos;
                    532:        ctl = mandoc_getcontrol(*bufp, &pos);
                    533:
1.94      kristaps  534:        /*
1.79      kristaps  535:         * First, if a scope is open and we're not a macro, pass the
                    536:         * text through the macro's filter.  If a scope isn't open and
                    537:         * we're not a macro, just let it through.
1.125     kristaps  538:         * Finally, if there's an equation scope open, divert it into it
                    539:         * no matter our state.
1.79      kristaps  540:         */
1.74      kristaps  541:
1.130     kristaps  542:        if (r->last && ! ctl) {
1.78      kristaps  543:                t = r->last->tok;
                    544:                assert(roffs[t].text);
1.109     kristaps  545:                e = (*roffs[t].text)
                    546:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    547:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  548:                if (ROFF_CONT != e)
                    549:                        return(e);
                    550:                if (r->eqn)
1.146     kristaps  551:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.125     kristaps  552:                if (r->tbl)
1.130     kristaps  553:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.125     kristaps  554:                return(ROFF_CONT);
1.130     kristaps  555:        } else if ( ! ctl) {
1.125     kristaps  556:                if (r->eqn)
1.146     kristaps  557:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.109     kristaps  558:                if (r->tbl)
1.130     kristaps  559:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.67      kristaps  560:                return(ROFF_CONT);
1.125     kristaps  561:        } else if (r->eqn)
1.146     kristaps  562:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
1.67      kristaps  563:
1.79      kristaps  564:        /*
                    565:         * If a scope is open, go to the child handler for that macro,
                    566:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  567:         * Don't do so if an equation is open.
1.79      kristaps  568:         */
1.78      kristaps  569:
1.79      kristaps  570:        if (r->last) {
                    571:                t = r->last->tok;
                    572:                assert(roffs[t].sub);
                    573:                return((*roffs[t].sub)
1.90      kristaps  574:                                (r, t, bufp, szp,
1.130     kristaps  575:                                 ln, ppos, pos, offs));
1.79      kristaps  576:        }
1.78      kristaps  577:
1.79      kristaps  578:        /*
                    579:         * Lastly, as we've no scope open, try to look up and execute
                    580:         * the new macro.  If no macro is found, simply return and let
                    581:         * the compilers handle it.
                    582:         */
1.67      kristaps  583:
1.106     kristaps  584:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  585:                return(ROFF_CONT);
1.67      kristaps  586:
1.75      kristaps  587:        assert(roffs[t].proc);
1.78      kristaps  588:        return((*roffs[t].proc)
1.90      kristaps  589:                        (r, t, bufp, szp,
                    590:                         ln, ppos, pos, offs));
1.74      kristaps  591: }
                    592:
                    593:
1.117     kristaps  594: void
1.74      kristaps  595: roff_endparse(struct roff *r)
                    596: {
                    597:
1.110     kristaps  598:        if (r->last)
1.128     kristaps  599:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  600:                                r->last->line, r->last->col, NULL);
1.117     kristaps  601:
1.125     kristaps  602:        if (r->eqn) {
1.128     kristaps  603:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.148     kristaps  604:                                r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  605:                eqn_end(&r->eqn);
1.125     kristaps  606:        }
                    607:
1.117     kristaps  608:        if (r->tbl) {
1.128     kristaps  609:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  610:                                r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  611:                tbl_end(&r->tbl);
1.117     kristaps  612:        }
1.67      kristaps  613: }
                    614:
                    615: /*
                    616:  * Parse a roff node's type from the input buffer.  This must be in the
                    617:  * form of ".foo xxx" in the usual way.
                    618:  */
                    619: static enum rofft
1.106     kristaps  620: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  621: {
1.106     kristaps  622:        const char      *mac;
                    623:        size_t           maclen;
1.67      kristaps  624:        enum rofft       t;
                    625:
1.144     kristaps  626:        if ('\0' == buf[*pos] || '"' == buf[*pos] ||
                    627:                        '\t' == buf[*pos] || ' ' == buf[*pos])
1.67      kristaps  628:                return(ROFF_MAX);
                    629:
1.144     kristaps  630:        /*
                    631:         * We stop the macro parse at an escape, tab, space, or nil.
                    632:         * However, `\}' is also a valid macro, so make sure we don't
                    633:         * clobber it by seeing the `\' as the end of token.
                    634:         */
                    635:
1.106     kristaps  636:        mac = buf + *pos;
1.144     kristaps  637:        maclen = strcspn(mac + 1, " \\\t\0") + 1;
1.67      kristaps  638:
1.106     kristaps  639:        t = (r->current_string = roff_getstrn(r, mac, maclen))
                    640:            ? ROFF_USERDEF : roff_hash_find(mac, maclen);
1.67      kristaps  641:
1.127     kristaps  642:        *pos += (int)maclen;
1.130     kristaps  643:
1.67      kristaps  644:        while (buf[*pos] && ' ' == buf[*pos])
                    645:                (*pos)++;
                    646:
                    647:        return(t);
                    648: }
                    649:
                    650: /* ARGSUSED */
                    651: static enum rofferr
1.76      kristaps  652: roff_cblock(ROFF_ARGS)
1.67      kristaps  653: {
                    654:
1.79      kristaps  655:        /*
                    656:         * A block-close `..' should only be invoked as a child of an
                    657:         * ignore macro, otherwise raise a warning and just ignore it.
                    658:         */
                    659:
1.76      kristaps  660:        if (NULL == r->last) {
1.128     kristaps  661:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  662:                return(ROFF_IGN);
                    663:        }
1.67      kristaps  664:
1.81      kristaps  665:        switch (r->last->tok) {
                    666:        case (ROFF_am):
                    667:                /* FALLTHROUGH */
                    668:        case (ROFF_ami):
                    669:                /* FALLTHROUGH */
                    670:        case (ROFF_am1):
                    671:                /* FALLTHROUGH */
                    672:        case (ROFF_de):
1.108     schwarze  673:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  674:                /* FALLTHROUGH */
                    675:        case (ROFF_dei):
                    676:                /* FALLTHROUGH */
                    677:        case (ROFF_ig):
                    678:                break;
                    679:        default:
1.128     kristaps  680:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  681:                return(ROFF_IGN);
1.76      kristaps  682:        }
1.67      kristaps  683:
1.76      kristaps  684:        if ((*bufp)[pos])
1.128     kristaps  685:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  686:
                    687:        roffnode_pop(r);
1.76      kristaps  688:        roffnode_cleanscope(r);
                    689:        return(ROFF_IGN);
1.71      kristaps  690:
1.67      kristaps  691: }
                    692:
                    693:
1.76      kristaps  694: static void
                    695: roffnode_cleanscope(struct roff *r)
1.67      kristaps  696: {
                    697:
1.76      kristaps  698:        while (r->last) {
                    699:                if (--r->last->endspan < 0)
                    700:                        break;
                    701:                roffnode_pop(r);
                    702:        }
1.67      kristaps  703: }
                    704:
                    705:
1.75      kristaps  706: /* ARGSUSED */
1.74      kristaps  707: static enum rofferr
1.75      kristaps  708: roff_ccond(ROFF_ARGS)
1.74      kristaps  709: {
                    710:
1.76      kristaps  711:        if (NULL == r->last) {
1.128     kristaps  712:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  713:                return(ROFF_IGN);
                    714:        }
                    715:
1.82      kristaps  716:        switch (r->last->tok) {
                    717:        case (ROFF_el):
                    718:                /* FALLTHROUGH */
                    719:        case (ROFF_ie):
                    720:                /* FALLTHROUGH */
                    721:        case (ROFF_if):
                    722:                break;
                    723:        default:
1.128     kristaps  724:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.75      kristaps  725:                return(ROFF_IGN);
                    726:        }
                    727:
1.76      kristaps  728:        if (r->last->endspan > -1) {
1.128     kristaps  729:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  730:                return(ROFF_IGN);
                    731:        }
                    732:
                    733:        if ((*bufp)[pos])
1.128     kristaps  734:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.76      kristaps  735:
1.75      kristaps  736:        roffnode_pop(r);
1.76      kristaps  737:        roffnode_cleanscope(r);
                    738:        return(ROFF_IGN);
                    739: }
                    740:
1.75      kristaps  741:
1.76      kristaps  742: /* ARGSUSED */
                    743: static enum rofferr
1.80      kristaps  744: roff_block(ROFF_ARGS)
1.76      kristaps  745: {
1.78      kristaps  746:        int             sv;
                    747:        size_t          sz;
1.106     kristaps  748:        char            *name;
                    749:
                    750:        name = NULL;
1.76      kristaps  751:
1.106     kristaps  752:        if (ROFF_ig != tok) {
                    753:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  754:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  755:                        return(ROFF_IGN);
                    756:                }
1.107     kristaps  757:
                    758:                /*
                    759:                 * Re-write `de1', since we don't really care about
                    760:                 * groff's strange compatibility mode, into `de'.
                    761:                 */
                    762:
1.106     kristaps  763:                if (ROFF_de1 == tok)
                    764:                        tok = ROFF_de;
                    765:                if (ROFF_de == tok)
                    766:                        name = *bufp + pos;
                    767:                else
1.128     kristaps  768:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  769:                            roffs[tok].name);
1.107     kristaps  770:
1.131     schwarze  771:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  772:                        pos++;
1.107     kristaps  773:
1.131     schwarze  774:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  775:                        (*bufp)[pos++] = '\0';
1.80      kristaps  776:        }
                    777:
1.106     kristaps  778:        roffnode_push(r, tok, name, ln, ppos);
                    779:
                    780:        /*
                    781:         * At the beginning of a `de' macro, clear the existing string
                    782:         * with the same name, if there is one.  New content will be
                    783:         * added from roff_block_text() in multiline mode.
                    784:         */
1.107     kristaps  785:
1.106     kristaps  786:        if (ROFF_de == tok)
1.108     schwarze  787:                roff_setstr(r, name, "", 0);
1.76      kristaps  788:
1.79      kristaps  789:        if ('\0' == (*bufp)[pos])
1.78      kristaps  790:                return(ROFF_IGN);
                    791:
1.107     kristaps  792:        /* If present, process the custom end-of-line marker. */
                    793:
1.78      kristaps  794:        sv = pos;
1.131     schwarze  795:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  796:                pos++;
                    797:
                    798:        /*
                    799:         * Note: groff does NOT like escape characters in the input.
                    800:         * Instead of detecting this, we're just going to let it fly and
                    801:         * to hell with it.
                    802:         */
                    803:
                    804:        assert(pos > sv);
                    805:        sz = (size_t)(pos - sv);
                    806:
1.79      kristaps  807:        if (1 == sz && '.' == (*bufp)[sv])
                    808:                return(ROFF_IGN);
                    809:
1.98      schwarze  810:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  811:
                    812:        memcpy(r->last->end, *bufp + sv, sz);
                    813:        r->last->end[(int)sz] = '\0';
                    814:
1.77      kristaps  815:        if ((*bufp)[pos])
1.128     kristaps  816:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  817:
1.78      kristaps  818:        return(ROFF_IGN);
                    819: }
                    820:
                    821:
                    822: /* ARGSUSED */
                    823: static enum rofferr
1.80      kristaps  824: roff_block_sub(ROFF_ARGS)
1.79      kristaps  825: {
                    826:        enum rofft      t;
                    827:        int             i, j;
                    828:
                    829:        /*
                    830:         * First check whether a custom macro exists at this level.  If
                    831:         * it does, then check against it.  This is some of groff's
                    832:         * stranger behaviours.  If we encountered a custom end-scope
                    833:         * tag and that tag also happens to be a "real" macro, then we
                    834:         * need to try interpreting it again as a real macro.  If it's
                    835:         * not, then return ignore.  Else continue.
                    836:         */
                    837:
                    838:        if (r->last->end) {
1.130     kristaps  839:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  840:                        if ((*bufp)[i] != r->last->end[j])
                    841:                                break;
                    842:
                    843:                if ('\0' == r->last->end[j] &&
                    844:                                ('\0' == (*bufp)[i] ||
                    845:                                 ' ' == (*bufp)[i] ||
                    846:                                 '\t' == (*bufp)[i])) {
                    847:                        roffnode_pop(r);
                    848:                        roffnode_cleanscope(r);
                    849:
1.130     kristaps  850:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                    851:                                i++;
                    852:
                    853:                        pos = i;
1.106     kristaps  854:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps  855:                                return(ROFF_RERUN);
                    856:                        return(ROFF_IGN);
                    857:                }
                    858:        }
                    859:
                    860:        /*
                    861:         * If we have no custom end-query or lookup failed, then try
                    862:         * pulling it out of the hashtable.
                    863:         */
                    864:
1.137     schwarze  865:        t = roff_parse(r, *bufp, &pos);
1.79      kristaps  866:
1.106     kristaps  867:        /*
                    868:         * Macros other than block-end are only significant
                    869:         * in `de' blocks; elsewhere, simply throw them away.
                    870:         */
                    871:        if (ROFF_cblock != t) {
                    872:                if (ROFF_de == tok)
                    873:                        roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79      kristaps  874:                return(ROFF_IGN);
1.106     kristaps  875:        }
1.79      kristaps  876:
                    877:        assert(roffs[t].proc);
1.90      kristaps  878:        return((*roffs[t].proc)(r, t, bufp, szp,
                    879:                                ln, ppos, pos, offs));
1.79      kristaps  880: }
                    881:
                    882:
                    883: /* ARGSUSED */
                    884: static enum rofferr
1.80      kristaps  885: roff_block_text(ROFF_ARGS)
1.78      kristaps  886: {
                    887:
1.106     kristaps  888:        if (ROFF_de == tok)
                    889:                roff_setstr(r, r->last->name, *bufp + pos, 1);
                    890:
1.78      kristaps  891:        return(ROFF_IGN);
                    892: }
                    893:
                    894:
                    895: /* ARGSUSED */
                    896: static enum rofferr
1.82      kristaps  897: roff_cond_sub(ROFF_ARGS)
                    898: {
                    899:        enum rofft       t;
                    900:        enum roffrule    rr;
1.139     kristaps  901:        char            *ep;
1.82      kristaps  902:
                    903:        rr = r->last->rule;
1.139     kristaps  904:        roffnode_cleanscope(r);
1.82      kristaps  905:
1.139     kristaps  906:        /*
                    907:         * If the macro is unknown, first check if it contains a closing
                    908:         * delimiter `\}'.  If it does, close out our scope and return
                    909:         * the currently-scoped rule (ignore or continue).  Else, drop
                    910:         * into the currently-scoped rule.
1.87      kristaps  911:         */
                    912:
1.106     kristaps  913:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
1.139     kristaps  914:                ep = &(*bufp)[pos];
                    915:                for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                    916:                        ep++;
                    917:                        if ('}' != *ep)
                    918:                                continue;
1.144     kristaps  919:
                    920:                        /*
                    921:                         * Make the \} go away.
                    922:                         * This is a little haphazard, as it's not quite
                    923:                         * clear how nroff does this.
                    924:                         * If we're at the end of line, then just chop
                    925:                         * off the \} and resize the buffer.
                    926:                         * If we aren't, then conver it to spaces.
                    927:                         */
                    928:
                    929:                        if ('\0' == *(ep + 1)) {
                    930:                                *--ep = '\0';
                    931:                                *szp -= 2;
                    932:                        } else
                    933:                                *(ep - 1) = *ep = ' ';
                    934:
1.139     kristaps  935:                        roff_ccond(r, ROFF_ccond, bufp, szp,
                    936:                                        ln, pos, pos + 2, offs);
                    937:                        break;
                    938:                }
1.82      kristaps  939:                return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.100     kristaps  940:        }
1.82      kristaps  941:
                    942:        /*
                    943:         * A denied conditional must evaluate its children if and only
                    944:         * if they're either structurally required (such as loops and
                    945:         * conditionals) or a closing macro.
                    946:         */
1.139     kristaps  947:
1.82      kristaps  948:        if (ROFFRULE_DENY == rr)
                    949:                if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
                    950:                        if (ROFF_ccond != t)
                    951:                                return(ROFF_IGN);
                    952:
                    953:        assert(roffs[t].proc);
1.90      kristaps  954:        return((*roffs[t].proc)(r, t, bufp, szp,
                    955:                                ln, ppos, pos, offs));
1.82      kristaps  956: }
                    957:
                    958: /* ARGSUSED */
                    959: static enum rofferr
                    960: roff_cond_text(ROFF_ARGS)
1.78      kristaps  961: {
1.140     kristaps  962:        char            *ep;
1.82      kristaps  963:        enum roffrule    rr;
                    964:
                    965:        rr = r->last->rule;
1.140     kristaps  966:        roffnode_cleanscope(r);
1.82      kristaps  967:
1.140     kristaps  968:        ep = &(*bufp)[pos];
                    969:        for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                    970:                ep++;
                    971:                if ('}' != *ep)
                    972:                        continue;
                    973:                *ep = '&';
                    974:                roff_ccond(r, ROFF_ccond, bufp, szp,
                    975:                                ln, pos, pos + 2, offs);
1.78      kristaps  976:        }
1.82      kristaps  977:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74      kristaps  978: }
                    979:
1.88      kristaps  980: static enum roffrule
                    981: roff_evalcond(const char *v, int *pos)
                    982: {
                    983:
                    984:        switch (v[*pos]) {
                    985:        case ('n'):
                    986:                (*pos)++;
                    987:                return(ROFFRULE_ALLOW);
                    988:        case ('e'):
                    989:                /* FALLTHROUGH */
                    990:        case ('o'):
                    991:                /* FALLTHROUGH */
                    992:        case ('t'):
                    993:                (*pos)++;
                    994:                return(ROFFRULE_DENY);
                    995:        default:
                    996:                break;
                    997:        }
                    998:
                    999:        while (v[*pos] && ' ' != v[*pos])
                   1000:                (*pos)++;
                   1001:        return(ROFFRULE_DENY);
                   1002: }
                   1003:
1.75      kristaps 1004: /* ARGSUSED */
1.74      kristaps 1005: static enum rofferr
1.103     kristaps 1006: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1007: {
1.123     schwarze 1008:
                   1009:        if (ROFF_it == tok)
1.128     kristaps 1010:                mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, "it");
1.89      kristaps 1011:
                   1012:        return(ROFF_IGN);
                   1013: }
                   1014:
1.104     kristaps 1015: /* ARGSUSED */
                   1016: static enum rofferr
1.82      kristaps 1017: roff_cond(ROFF_ARGS)
1.74      kristaps 1018: {
1.77      kristaps 1019:        int              sv;
1.88      kristaps 1020:        enum roffrule    rule;
1.74      kristaps 1021:
1.134     kristaps 1022:        /*
                   1023:         * An `.el' has no conditional body: it will consume the value
                   1024:         * of the current rstack entry set in prior `ie' calls or
                   1025:         * defaults to DENY.
                   1026:         *
                   1027:         * If we're not an `el', however, then evaluate the conditional.
                   1028:         */
1.133     kristaps 1029:
1.134     kristaps 1030:        rule = ROFF_el == tok ?
                   1031:                (r->rstackpos < 0 ?
                   1032:                 ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
                   1033:                roff_evalcond(*bufp, &pos);
1.77      kristaps 1034:
                   1035:        sv = pos;
1.75      kristaps 1036:        while (' ' == (*bufp)[pos])
                   1037:                pos++;
1.74      kristaps 1038:
1.77      kristaps 1039:        /*
                   1040:         * Roff is weird.  If we have just white-space after the
                   1041:         * conditional, it's considered the BODY and we exit without
                   1042:         * really doing anything.  Warn about this.  It's probably
                   1043:         * wrong.
                   1044:         */
1.88      kristaps 1045:
1.77      kristaps 1046:        if ('\0' == (*bufp)[pos] && sv != pos) {
1.128     kristaps 1047:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.107     kristaps 1048:                return(ROFF_IGN);
1.77      kristaps 1049:        }
                   1050:
1.106     kristaps 1051:        roffnode_push(r, tok, NULL, ln, ppos);
1.77      kristaps 1052:
1.88      kristaps 1053:        r->last->rule = rule;
                   1054:
1.134     kristaps 1055:        /*
                   1056:         * An if-else will put the NEGATION of the current evaluated
                   1057:         * conditional into the stack of rules.
                   1058:         */
                   1059:
1.84      schwarze 1060:        if (ROFF_ie == tok) {
1.134     kristaps 1061:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1062:                        mandoc_msg(MANDOCERR_MEM,
                   1063:                                r->parse, ln, ppos, NULL);
                   1064:                        return(ROFF_ERR);
                   1065:                }
                   1066:                r->rstack[++r->rstackpos] =
                   1067:                        ROFFRULE_DENY == r->last->rule ?
                   1068:                        ROFFRULE_ALLOW : ROFFRULE_DENY;
1.82      kristaps 1069:        }
1.88      kristaps 1070:
                   1071:        /* If the parent has false as its rule, then so do we. */
                   1072:
1.109     kristaps 1073:        if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
1.84      schwarze 1074:                r->last->rule = ROFFRULE_DENY;
1.88      kristaps 1075:
                   1076:        /*
                   1077:         * Determine scope.  If we're invoked with "\{" trailing the
                   1078:         * conditional, then we're in a multiline scope.  Else our scope
                   1079:         * expires on the next line.
                   1080:         */
1.74      kristaps 1081:
1.75      kristaps 1082:        r->last->endspan = 1;
                   1083:
                   1084:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1085:                r->last->endspan = -1;
                   1086:                pos += 2;
1.109     kristaps 1087:        }
1.74      kristaps 1088:
1.77      kristaps 1089:        /*
                   1090:         * If there are no arguments on the line, the next-line scope is
                   1091:         * assumed.
                   1092:         */
                   1093:
1.75      kristaps 1094:        if ('\0' == (*bufp)[pos])
                   1095:                return(ROFF_IGN);
1.77      kristaps 1096:
                   1097:        /* Otherwise re-run the roff parser after recalculating. */
1.74      kristaps 1098:
1.75      kristaps 1099:        *offs = pos;
                   1100:        return(ROFF_RERUN);
1.83      schwarze 1101: }
                   1102:
                   1103:
                   1104: /* ARGSUSED */
                   1105: static enum rofferr
1.92      schwarze 1106: roff_ds(ROFF_ARGS)
                   1107: {
1.96      kristaps 1108:        char            *name, *string;
                   1109:
                   1110:        /*
                   1111:         * A symbol is named by the first word following the macro
                   1112:         * invocation up to a space.  Its value is anything after the
                   1113:         * name's trailing whitespace and optional double-quote.  Thus,
                   1114:         *
                   1115:         *  [.ds foo "bar  "     ]
                   1116:         *
                   1117:         * will have `bar  "     ' as its value.
                   1118:         */
1.92      schwarze 1119:
1.121     schwarze 1120:        string = *bufp + pos;
                   1121:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1122:        if ('\0' == *name)
                   1123:                return(ROFF_IGN);
                   1124:
1.121     schwarze 1125:        /* Read past initial double-quote. */
                   1126:        if ('"' == *string)
1.92      schwarze 1127:                string++;
                   1128:
1.96      kristaps 1129:        /* The rest is the value. */
1.106     kristaps 1130:        roff_setstr(r, name, string, 0);
1.92      schwarze 1131:        return(ROFF_IGN);
                   1132: }
                   1133:
1.147     kristaps 1134: int
                   1135: roff_regisset(const struct roff *r, enum regs reg)
                   1136: {
                   1137:
                   1138:        return(r->regs[(int)reg].set);
                   1139: }
                   1140:
                   1141: unsigned int
                   1142: roff_regget(const struct roff *r, enum regs reg)
                   1143: {
                   1144:
                   1145:        return(r->regs[(int)reg].u);
                   1146: }
                   1147:
                   1148: void
                   1149: roff_regunset(struct roff *r, enum regs reg)
                   1150: {
                   1151:
                   1152:        r->regs[(int)reg].set = 0;
                   1153: }
1.92      schwarze 1154:
                   1155: /* ARGSUSED */
                   1156: static enum rofferr
1.89      kristaps 1157: roff_nr(ROFF_ARGS)
1.83      schwarze 1158: {
1.121     schwarze 1159:        const char      *key;
                   1160:        char            *val;
1.138     kristaps 1161:        int              iv;
1.89      kristaps 1162:
1.121     schwarze 1163:        val = *bufp + pos;
                   1164:        key = roff_getname(r, &val, ln, pos);
1.89      kristaps 1165:
                   1166:        if (0 == strcmp(key, "nS")) {
1.147     kristaps 1167:                r->regs[(int)REG_nS].set = 1;
1.149     kristaps 1168:                if ((iv = mandoc_strntoi(val, strlen(val), 10)) >= 0)
1.147     kristaps 1169:                        r->regs[(int)REG_nS].u = (unsigned)iv;
1.138     kristaps 1170:                else
1.147     kristaps 1171:                        r->regs[(int)REG_nS].u = 0u;
1.109     kristaps 1172:        }
                   1173:
1.122     schwarze 1174:        return(ROFF_IGN);
                   1175: }
                   1176:
                   1177: /* ARGSUSED */
                   1178: static enum rofferr
                   1179: roff_rm(ROFF_ARGS)
                   1180: {
                   1181:        const char       *name;
                   1182:        char             *cp;
                   1183:
                   1184:        cp = *bufp + pos;
                   1185:        while ('\0' != *cp) {
1.127     kristaps 1186:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1187:                if ('\0' != *name)
                   1188:                        roff_setstr(r, name, NULL, 0);
                   1189:        }
1.109     kristaps 1190:        return(ROFF_IGN);
                   1191: }
                   1192:
                   1193: /* ARGSUSED */
                   1194: static enum rofferr
                   1195: roff_TE(ROFF_ARGS)
                   1196: {
                   1197:
                   1198:        if (NULL == r->tbl)
1.128     kristaps 1199:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1200:        else
1.151     kristaps 1201:                tbl_end(&r->tbl);
1.109     kristaps 1202:
1.112     kristaps 1203:        return(ROFF_IGN);
                   1204: }
                   1205:
                   1206: /* ARGSUSED */
                   1207: static enum rofferr
                   1208: roff_T_(ROFF_ARGS)
                   1209: {
                   1210:
                   1211:        if (NULL == r->tbl)
1.128     kristaps 1212:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1213:        else
1.116     kristaps 1214:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1215:
1.109     kristaps 1216:        return(ROFF_IGN);
                   1217: }
                   1218:
1.151     kristaps 1219: int
                   1220: roff_closeeqn(struct roff *r)
                   1221: {
                   1222:
                   1223:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1224: }
                   1225:
                   1226: void
                   1227: roff_openeqn(struct roff *r, const char *name, int line,
                   1228:                int offs, const char *buf)
1.125     kristaps 1229: {
1.151     kristaps 1230:        struct eqn_node *e;
                   1231:        int              poff;
1.125     kristaps 1232:
                   1233:        assert(NULL == r->eqn);
1.151     kristaps 1234:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1235:
                   1236:        if (r->last_eqn)
                   1237:                r->last_eqn->next = e;
                   1238:        else
                   1239:                r->first_eqn = r->last_eqn = e;
                   1240:
                   1241:        r->eqn = r->last_eqn = e;
1.151     kristaps 1242:
                   1243:        if (buf) {
                   1244:                poff = 0;
                   1245:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1246:        }
                   1247: }
                   1248:
                   1249: /* ARGSUSED */
                   1250: static enum rofferr
                   1251: roff_EQ(ROFF_ARGS)
                   1252: {
                   1253:
                   1254:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1255:        return(ROFF_IGN);
                   1256: }
                   1257:
                   1258: /* ARGSUSED */
                   1259: static enum rofferr
                   1260: roff_EN(ROFF_ARGS)
                   1261: {
                   1262:
1.128     kristaps 1263:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1264:        return(ROFF_IGN);
                   1265: }
                   1266:
                   1267: /* ARGSUSED */
                   1268: static enum rofferr
1.109     kristaps 1269: roff_TS(ROFF_ARGS)
                   1270: {
1.118     kristaps 1271:        struct tbl_node *t;
1.89      kristaps 1272:
1.115     kristaps 1273:        if (r->tbl) {
1.128     kristaps 1274:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1275:                tbl_end(&r->tbl);
1.115     kristaps 1276:        }
1.83      schwarze 1277:
1.128     kristaps 1278:        t = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1279:
                   1280:        if (r->last_tbl)
                   1281:                r->last_tbl->next = t;
                   1282:        else
                   1283:                r->first_tbl = r->last_tbl = t;
                   1284:
                   1285:        r->tbl = r->last_tbl = t;
1.83      schwarze 1286:        return(ROFF_IGN);
1.92      schwarze 1287: }
                   1288:
1.105     kristaps 1289: /* ARGSUSED */
                   1290: static enum rofferr
                   1291: roff_so(ROFF_ARGS)
                   1292: {
                   1293:        char *name;
                   1294:
1.128     kristaps 1295:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1296:
                   1297:        /*
                   1298:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1299:         * opening anything that's not in our cwd or anything beneath
                   1300:         * it.  Thus, explicitly disallow traversing up the file-system
                   1301:         * or using absolute paths.
                   1302:         */
                   1303:
                   1304:        name = *bufp + pos;
                   1305:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1306:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1307:                return(ROFF_ERR);
                   1308:        }
                   1309:
                   1310:        *offs = pos;
                   1311:        return(ROFF_SO);
                   1312: }
1.92      schwarze 1313:
1.106     kristaps 1314: /* ARGSUSED */
                   1315: static enum rofferr
                   1316: roff_userdef(ROFF_ARGS)
1.99      kristaps 1317: {
1.106     kristaps 1318:        const char       *arg[9];
                   1319:        char             *cp, *n1, *n2;
1.119     schwarze 1320:        int               i;
1.106     kristaps 1321:
                   1322:        /*
                   1323:         * Collect pointers to macro argument strings
                   1324:         * and null-terminate them.
                   1325:         */
                   1326:        cp = *bufp + pos;
1.119     schwarze 1327:        for (i = 0; i < 9; i++)
1.120     schwarze 1328:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1329:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1330:
1.106     kristaps 1331:        /*
                   1332:         * Expand macro arguments.
1.99      kristaps 1333:         */
1.106     kristaps 1334:        *szp = 0;
                   1335:        n1 = cp = mandoc_strdup(r->current_string);
                   1336:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1337:                i = cp[2] - '1';
                   1338:                if (0 > i || 8 < i) {
                   1339:                        /* Not an argument invocation. */
                   1340:                        cp += 2;
                   1341:                        continue;
                   1342:                }
                   1343:
                   1344:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1345:                n2 = mandoc_malloc(*szp);
                   1346:
                   1347:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1348:                strlcat(n2, arg[i], *szp);
                   1349:                strlcat(n2, cp + 3, *szp);
                   1350:
                   1351:                cp = n2 + (cp - n1);
                   1352:                free(n1);
                   1353:                n1 = n2;
1.99      kristaps 1354:        }
                   1355:
1.106     kristaps 1356:        /*
                   1357:         * Replace the macro invocation
                   1358:         * by the expanded macro.
                   1359:         */
                   1360:        free(*bufp);
                   1361:        *bufp = n1;
                   1362:        if (0 == *szp)
                   1363:                *szp = strlen(*bufp) + 1;
                   1364:
                   1365:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   1366:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 1367: }
1.121     schwarze 1368:
                   1369: static char *
                   1370: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   1371: {
                   1372:        char     *name, *cp;
                   1373:
                   1374:        name = *cpp;
                   1375:        if ('\0' == *name)
                   1376:                return(name);
                   1377:
                   1378:        /* Read until end of name. */
                   1379:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   1380:                if ('\\' != *cp)
                   1381:                        continue;
                   1382:                cp++;
                   1383:                if ('\\' == *cp)
                   1384:                        continue;
1.128     kristaps 1385:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 1386:                *cp = '\0';
                   1387:                name = cp;
                   1388:        }
                   1389:
                   1390:        /* Nil-terminate name. */
                   1391:        if ('\0' != *cp)
                   1392:                *(cp++) = '\0';
                   1393:
                   1394:        /* Read past spaces. */
                   1395:        while (' ' == *cp)
                   1396:                cp++;
                   1397:
                   1398:        *cpp = cp;
                   1399:        return(name);
                   1400: }
                   1401:
1.106     kristaps 1402: /*
                   1403:  * Store *string into the user-defined string called *name.
                   1404:  * In multiline mode, append to an existing entry and append '\n';
                   1405:  * else replace the existing entry, if there is one.
                   1406:  * To clear an existing entry, call with (*r, *name, NULL, 0).
                   1407:  */
1.94      kristaps 1408: static void
1.106     kristaps 1409: roff_setstr(struct roff *r, const char *name, const char *string,
                   1410:        int multiline)
1.92      schwarze 1411: {
                   1412:        struct roffstr   *n;
1.106     kristaps 1413:        char             *c;
                   1414:        size_t            oldch, newch;
1.92      schwarze 1415:
1.106     kristaps 1416:        /* Search for an existing string with the same name. */
1.94      kristaps 1417:        n = r->first_string;
1.92      schwarze 1418:        while (n && strcmp(name, n->name))
                   1419:                n = n->next;
1.94      kristaps 1420:
                   1421:        if (NULL == n) {
1.106     kristaps 1422:                /* Create a new string table entry. */
1.94      kristaps 1423:                n = mandoc_malloc(sizeof(struct roffstr));
1.106     kristaps 1424:                n->name = mandoc_strdup(name);
                   1425:                n->string = NULL;
1.94      kristaps 1426:                n->next = r->first_string;
                   1427:                r->first_string = n;
1.106     kristaps 1428:        } else if (0 == multiline) {
                   1429:                /* In multiline mode, append; else replace. */
1.92      schwarze 1430:                free(n->string);
1.106     kristaps 1431:                n->string = NULL;
                   1432:        }
                   1433:
                   1434:        if (NULL == string)
                   1435:                return;
                   1436:
                   1437:        /*
                   1438:         * One additional byte for the '\n' in multiline mode,
                   1439:         * and one for the terminating '\0'.
                   1440:         */
1.127     kristaps 1441:        newch = strlen(string) + (multiline ? 2u : 1u);
1.106     kristaps 1442:        if (NULL == n->string) {
                   1443:                n->string = mandoc_malloc(newch);
                   1444:                *n->string = '\0';
                   1445:                oldch = 0;
                   1446:        } else {
                   1447:                oldch = strlen(n->string);
                   1448:                n->string = mandoc_realloc(n->string, oldch + newch);
                   1449:        }
                   1450:
                   1451:        /* Skip existing content in the destination buffer. */
1.127     kristaps 1452:        c = n->string + (int)oldch;
1.106     kristaps 1453:
                   1454:        /* Append new content to the destination buffer. */
                   1455:        while (*string) {
                   1456:                /*
                   1457:                 * Rudimentary roff copy mode:
                   1458:                 * Handle escaped backslashes.
                   1459:                 */
                   1460:                if ('\\' == *string && '\\' == *(string + 1))
                   1461:                        string++;
                   1462:                *c++ = *string++;
                   1463:        }
1.94      kristaps 1464:
1.106     kristaps 1465:        /* Append terminating bytes. */
                   1466:        if (multiline)
                   1467:                *c++ = '\n';
                   1468:        *c = '\0';
1.92      schwarze 1469: }
                   1470:
1.94      kristaps 1471: static const char *
                   1472: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 1473: {
1.94      kristaps 1474:        const struct roffstr *n;
1.92      schwarze 1475:
1.94      kristaps 1476:        n = r->first_string;
1.97      kristaps 1477:        while (n && (strncmp(name, n->name, len) || '\0' != n->name[(int)len]))
1.92      schwarze 1478:                n = n->next;
1.94      kristaps 1479:
                   1480:        return(n ? n->string : NULL);
1.92      schwarze 1481: }
                   1482:
1.94      kristaps 1483: static void
                   1484: roff_freestr(struct roff *r)
1.92      schwarze 1485: {
                   1486:        struct roffstr   *n, *nn;
                   1487:
1.94      kristaps 1488:        for (n = r->first_string; n; n = nn) {
1.92      schwarze 1489:                free(n->name);
                   1490:                free(n->string);
                   1491:                nn = n->next;
                   1492:                free(n);
                   1493:        }
1.94      kristaps 1494:
                   1495:        r->first_string = NULL;
1.114     kristaps 1496: }
                   1497:
                   1498: const struct tbl_span *
                   1499: roff_span(const struct roff *r)
                   1500: {
                   1501:
                   1502:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 1503: }
                   1504:
                   1505: const struct eqn *
                   1506: roff_eqn(const struct roff *r)
                   1507: {
                   1508:
                   1509:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.151     kristaps 1510: }
                   1511:
                   1512: char
                   1513: roff_eqndelim(const struct roff *r)
                   1514: {
                   1515:
                   1516:        return('\0');
1.74      kristaps 1517: }

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