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Annotation of mandoc/roff.c, Revision 1.136

1.136   ! kristaps    1: /*     $Id: roff.c,v 1.135 2011/04/17 09:08:19 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>
1.89      kristaps   23: #include <errno.h>
1.85      kristaps   24: #include <ctype.h>
1.89      kristaps   25: #include <limits.h>
1.1       kristaps   26: #include <stdlib.h>
1.67      kristaps   27: #include <string.h>
1.75      kristaps   28: #include <stdio.h>
1.1       kristaps   29:
1.67      kristaps   30: #include "mandoc.h"
1.109     kristaps   31: #include "libroff.h"
1.94      kristaps   32: #include "libmandoc.h"
1.33      kristaps   33:
1.82      kristaps   34: #define        RSTACK_MAX      128
                     35:
1.67      kristaps   36: enum   rofft {
1.103     kristaps   37:        ROFF_ad,
1.80      kristaps   38:        ROFF_am,
                     39:        ROFF_ami,
                     40:        ROFF_am1,
                     41:        ROFF_de,
                     42:        ROFF_dei,
                     43:        ROFF_de1,
1.83      schwarze   44:        ROFF_ds,
1.82      kristaps   45:        ROFF_el,
1.103     kristaps   46:        ROFF_hy,
1.82      kristaps   47:        ROFF_ie,
1.75      kristaps   48:        ROFF_if,
1.76      kristaps   49:        ROFF_ig,
1.123     schwarze   50:        ROFF_it,
1.103     kristaps   51:        ROFF_ne,
                     52:        ROFF_nh,
1.104     kristaps   53:        ROFF_nr,
1.124     schwarze   54:        ROFF_ns,
                     55:        ROFF_ps,
1.83      schwarze   56:        ROFF_rm,
1.105     kristaps   57:        ROFF_so,
1.124     schwarze   58:        ROFF_ta,
1.83      schwarze   59:        ROFF_tr,
1.109     kristaps   60:        ROFF_TS,
                     61:        ROFF_TE,
1.112     kristaps   62:        ROFF_T_,
1.125     kristaps   63:        ROFF_EQ,
                     64:        ROFF_EN,
1.76      kristaps   65:        ROFF_cblock,
1.100     kristaps   66:        ROFF_ccond, /* FIXME: remove this. */
1.106     kristaps   67:        ROFF_USERDEF,
1.67      kristaps   68:        ROFF_MAX
                     69: };
                     70:
1.82      kristaps   71: enum   roffrule {
                     72:        ROFFRULE_ALLOW,
                     73:        ROFFRULE_DENY
                     74: };
                     75:
1.94      kristaps   76: struct roffstr {
                     77:        char            *name; /* key of symbol */
                     78:        char            *string; /* current value */
                     79:        struct roffstr  *next; /* next in list */
                     80: };
                     81:
1.67      kristaps   82: struct roff {
1.128     kristaps   83:        struct mparse   *parse; /* parse point */
1.67      kristaps   84:        struct roffnode *last; /* leaf of stack */
1.82      kristaps   85:        enum roffrule    rstack[RSTACK_MAX]; /* stack of !`ie' rules */
                     86:        int              rstackpos; /* position in rstack */
1.90      kristaps   87:        struct regset   *regs; /* read/writable registers */
1.106     kristaps   88:        struct roffstr  *first_string; /* user-defined strings & macros */
                     89:        const char      *current_string; /* value of last called user macro */
1.118     kristaps   90:        struct tbl_node *first_tbl; /* first table parsed */
                     91:        struct tbl_node *last_tbl; /* last table parsed */
                     92:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps   93:        struct eqn_node *last_eqn; /* last equation parsed */
                     94:        struct eqn_node *first_eqn; /* first equation parsed */
                     95:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps   96: };
                     97:
1.67      kristaps   98: struct roffnode {
                     99:        enum rofft       tok; /* type of node */
                    100:        struct roffnode *parent; /* up one in stack */
                    101:        int              line; /* parse line */
                    102:        int              col; /* parse col */
1.106     kristaps  103:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  104:        char            *end; /* end-rules: custom token */
                    105:        int              endspan; /* end-rules: next-line or infty */
1.82      kristaps  106:        enum roffrule    rule; /* current evaluation rule */
1.67      kristaps  107: };
                    108:
                    109: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  110:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  111:                         char **bufp, /* input buffer */ \
                    112:                         size_t *szp, /* size of input buffer */ \
                    113:                         int ln, /* parse line */ \
1.75      kristaps  114:                         int ppos, /* original pos in buffer */ \
                    115:                         int pos, /* current pos in buffer */ \
1.74      kristaps  116:                         int *offs /* reset offset of buffer data */
1.67      kristaps  117:
                    118: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    119:
                    120: struct roffmac {
                    121:        const char      *name; /* macro name */
1.79      kristaps  122:        roffproc         proc; /* process new macro */
                    123:        roffproc         text; /* process as child text of macro */
                    124:        roffproc         sub; /* process as child of macro */
                    125:        int              flags;
                    126: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  127:        struct roffmac  *next;
1.67      kristaps  128: };
                    129:
1.80      kristaps  130: static enum rofferr     roff_block(ROFF_ARGS);
                    131: static enum rofferr     roff_block_text(ROFF_ARGS);
                    132: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    133: static enum rofferr     roff_cblock(ROFF_ARGS);
                    134: static enum rofferr     roff_ccond(ROFF_ARGS);
1.82      kristaps  135: static enum rofferr     roff_cond(ROFF_ARGS);
                    136: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    137: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  138: static enum rofferr     roff_ds(ROFF_ARGS);
1.94      kristaps  139: static enum roffrule    roff_evalcond(const char *, int *);
                    140: static void             roff_freestr(struct roff *);
1.121     schwarze  141: static char            *roff_getname(struct roff *, char **, int, int);
1.94      kristaps  142: static const char      *roff_getstrn(const struct roff *,
                    143:                                const char *, size_t);
1.103     kristaps  144: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  145: static enum rofferr     roff_nr(ROFF_ARGS);
1.95      kristaps  146: static int              roff_res(struct roff *,
                    147:                                char **, size_t *, int);
1.122     schwarze  148: static enum rofferr     roff_rm(ROFF_ARGS);
1.94      kristaps  149: static void             roff_setstr(struct roff *,
1.106     kristaps  150:                                const char *, const char *, int);
1.105     kristaps  151: static enum rofferr     roff_so(ROFF_ARGS);
1.109     kristaps  152: static enum rofferr     roff_TE(ROFF_ARGS);
                    153: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  154: static enum rofferr     roff_EQ(ROFF_ARGS);
                    155: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  156: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  157: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  158:
1.85      kristaps  159: /* See roff_hash_find() */
                    160:
                    161: #define        ASCII_HI         126
                    162: #define        ASCII_LO         33
                    163: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    164:
                    165: static struct roffmac  *hash[HASHWIDTH];
                    166:
                    167: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  168:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  169:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    170:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    171:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    172:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    173:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    174:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  175:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  176:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.103     kristaps  177:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  178:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    179:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    180:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.123     schwarze  181:        { "it", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  182:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    183:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  184:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  185:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    186:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  187:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.105     kristaps  188:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  189:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  190:        { "tr", roff_line_ignore, NULL, NULL, 0, NULL },
1.109     kristaps  191:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    192:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  193:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  194:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    195:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  196:        { ".", roff_cblock, NULL, NULL, 0, NULL },
                    197:        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106     kristaps  198:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  199: };
                    200:
                    201: static void             roff_free1(struct roff *);
1.106     kristaps  202: static enum rofft       roff_hash_find(const char *, size_t);
1.85      kristaps  203: static void             roff_hash_init(void);
1.76      kristaps  204: static void             roffnode_cleanscope(struct roff *);
1.106     kristaps  205: static void             roffnode_push(struct roff *, enum rofft,
                    206:                                const char *, int, int);
1.67      kristaps  207: static void             roffnode_pop(struct roff *);
1.106     kristaps  208: static enum rofft       roff_parse(struct roff *, const char *, int *);
1.91      kristaps  209: static int              roff_parse_nat(const char *, unsigned int *);
1.67      kristaps  210:
1.85      kristaps  211: /* See roff_hash_find() */
                    212: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    213:
                    214: static void
                    215: roff_hash_init(void)
                    216: {
                    217:        struct roffmac   *n;
                    218:        int               buc, i;
                    219:
1.106     kristaps  220:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  221:                assert(roffs[i].name[0] >= ASCII_LO);
                    222:                assert(roffs[i].name[0] <= ASCII_HI);
                    223:
                    224:                buc = ROFF_HASH(roffs[i].name);
                    225:
                    226:                if (NULL != (n = hash[buc])) {
                    227:                        for ( ; n->next; n = n->next)
                    228:                                /* Do nothing. */ ;
                    229:                        n->next = &roffs[i];
                    230:                } else
                    231:                        hash[buc] = &roffs[i];
                    232:        }
                    233: }
                    234:
1.67      kristaps  235:
                    236: /*
                    237:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    238:  * the nil-terminated string name could be found.
                    239:  */
                    240: static enum rofft
1.106     kristaps  241: roff_hash_find(const char *p, size_t s)
1.67      kristaps  242: {
1.85      kristaps  243:        int              buc;
                    244:        struct roffmac  *n;
1.67      kristaps  245:
1.85      kristaps  246:        /*
                    247:         * libroff has an extremely simple hashtable, for the time
                    248:         * being, which simply keys on the first character, which must
                    249:         * be printable, then walks a chain.  It works well enough until
                    250:         * optimised.
                    251:         */
                    252:
                    253:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    254:                return(ROFF_MAX);
                    255:
                    256:        buc = ROFF_HASH(p);
                    257:
                    258:        if (NULL == (n = hash[buc]))
                    259:                return(ROFF_MAX);
                    260:        for ( ; n; n = n->next)
1.106     kristaps  261:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  262:                        return((enum rofft)(n - roffs));
1.67      kristaps  263:
                    264:        return(ROFF_MAX);
                    265: }
                    266:
                    267:
                    268: /*
                    269:  * Pop the current node off of the stack of roff instructions currently
                    270:  * pending.
                    271:  */
                    272: static void
                    273: roffnode_pop(struct roff *r)
                    274: {
                    275:        struct roffnode *p;
                    276:
1.75      kristaps  277:        assert(r->last);
                    278:        p = r->last;
1.82      kristaps  279:
1.75      kristaps  280:        r->last = r->last->parent;
1.106     kristaps  281:        free(p->name);
                    282:        free(p->end);
1.67      kristaps  283:        free(p);
                    284: }
                    285:
                    286:
                    287: /*
                    288:  * Push a roff node onto the instruction stack.  This must later be
                    289:  * removed with roffnode_pop().
                    290:  */
1.98      schwarze  291: static void
1.106     kristaps  292: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    293:                int line, int col)
1.67      kristaps  294: {
                    295:        struct roffnode *p;
                    296:
1.98      schwarze  297:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  298:        p->tok = tok;
1.106     kristaps  299:        if (name)
                    300:                p->name = mandoc_strdup(name);
1.67      kristaps  301:        p->parent = r->last;
                    302:        p->line = line;
                    303:        p->col = col;
1.79      kristaps  304:        p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67      kristaps  305:
                    306:        r->last = p;
                    307: }
                    308:
                    309:
                    310: static void
                    311: roff_free1(struct roff *r)
                    312: {
1.118     kristaps  313:        struct tbl_node *t;
1.125     kristaps  314:        struct eqn_node *e;
1.67      kristaps  315:
1.125     kristaps  316:        while (NULL != (t = r->first_tbl)) {
1.113     kristaps  317:                r->first_tbl = t->next;
                    318:                tbl_free(t);
1.109     kristaps  319:        }
                    320:
1.113     kristaps  321:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    322:
1.125     kristaps  323:        while (NULL != (e = r->first_eqn)) {
                    324:                r->first_eqn = e->next;
                    325:                eqn_free(e);
                    326:        }
                    327:
                    328:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    329:
1.67      kristaps  330:        while (r->last)
                    331:                roffnode_pop(r);
1.109     kristaps  332:
1.94      kristaps  333:        roff_freestr(r);
1.67      kristaps  334: }
                    335:
                    336:
                    337: void
                    338: roff_reset(struct roff *r)
                    339: {
                    340:
                    341:        roff_free1(r);
                    342: }
                    343:
                    344:
                    345: void
                    346: roff_free(struct roff *r)
                    347: {
                    348:
                    349:        roff_free1(r);
                    350:        free(r);
                    351: }
                    352:
                    353:
                    354: struct roff *
1.128     kristaps  355: roff_alloc(struct regset *regs, struct mparse *parse)
1.67      kristaps  356: {
                    357:        struct roff     *r;
                    358:
1.98      schwarze  359:        r = mandoc_calloc(1, sizeof(struct roff));
1.90      kristaps  360:        r->regs = regs;
1.128     kristaps  361:        r->parse = parse;
1.82      kristaps  362:        r->rstackpos = -1;
1.85      kristaps  363:
                    364:        roff_hash_init();
1.67      kristaps  365:        return(r);
                    366: }
                    367:
                    368:
1.94      kristaps  369: /*
                    370:  * Pre-filter each and every line for reserved words (one beginning with
                    371:  * `\*', e.g., `\*(ab').  These must be handled before the actual line
                    372:  * is processed.
                    373:  */
                    374: static int
1.95      kristaps  375: roff_res(struct roff *r, char **bufp, size_t *szp, int pos)
1.94      kristaps  376: {
1.108     schwarze  377:        const char      *stesc; /* start of an escape sequence ('\\') */
                    378:        const char      *stnam; /* start of the name, after "[(*" */
                    379:        const char      *cp;    /* end of the name, e.g. before ']' */
                    380:        const char      *res;   /* the string to be substituted */
1.94      kristaps  381:        int              i, maxl;
                    382:        size_t           nsz;
                    383:        char            *n;
                    384:
1.108     schwarze  385:        /* Search for a leading backslash and save a pointer to it. */
                    386:
                    387:        cp = *bufp + pos;
                    388:        while (NULL != (cp = strchr(cp, '\\'))) {
                    389:                stesc = cp++;
                    390:
                    391:                /*
                    392:                 * The second character must be an asterisk.
                    393:                 * If it isn't, skip it anyway:  It is escaped,
                    394:                 * so it can't start another escape sequence.
                    395:                 */
                    396:
                    397:                if ('\0' == *cp)
                    398:                        return(1);
                    399:                if ('*' != *cp++)
                    400:                        continue;
                    401:
                    402:                /*
                    403:                 * The third character decides the length
                    404:                 * of the name of the string.
                    405:                 * Save a pointer to the name.
                    406:                 */
                    407:
1.94      kristaps  408:                switch (*cp) {
1.108     schwarze  409:                case ('\0'):
                    410:                        return(1);
1.94      kristaps  411:                case ('('):
                    412:                        cp++;
                    413:                        maxl = 2;
                    414:                        break;
                    415:                case ('['):
                    416:                        cp++;
                    417:                        maxl = 0;
                    418:                        break;
                    419:                default:
                    420:                        maxl = 1;
                    421:                        break;
                    422:                }
1.108     schwarze  423:                stnam = cp;
1.94      kristaps  424:
1.108     schwarze  425:                /* Advance to the end of the name. */
1.94      kristaps  426:
                    427:                for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
                    428:                        if ('\0' == *cp)
                    429:                                return(1); /* Error. */
                    430:                        if (0 == maxl && ']' == *cp)
                    431:                                break;
                    432:                }
                    433:
1.108     schwarze  434:                /*
                    435:                 * Retrieve the replacement string; if it is
                    436:                 * undefined, resume searching for escapes.
                    437:                 */
                    438:
                    439:                res = roff_getstrn(r, stnam, (size_t)i);
1.94      kristaps  440:
                    441:                if (NULL == res) {
                    442:                        cp -= maxl ? 1 : 0;
                    443:                        continue;
                    444:                }
                    445:
1.108     schwarze  446:                /* Replace the escape sequence by the string. */
                    447:
1.94      kristaps  448:                nsz = *szp + strlen(res) + 1;
                    449:                n = mandoc_malloc(nsz);
                    450:
1.108     schwarze  451:                strlcpy(n, *bufp, (size_t)(stesc - *bufp + 1));
1.94      kristaps  452:                strlcat(n, res, nsz);
                    453:                strlcat(n, cp + (maxl ? 0 : 1), nsz);
                    454:
                    455:                free(*bufp);
                    456:
                    457:                *bufp = n;
                    458:                *szp = nsz;
                    459:                return(0);
                    460:        }
                    461:
                    462:        return(1);
                    463: }
                    464:
                    465:
1.67      kristaps  466: enum rofferr
1.90      kristaps  467: roff_parseln(struct roff *r, int ln, char **bufp,
                    468:                size_t *szp, int pos, int *offs)
1.67      kristaps  469: {
                    470:        enum rofft       t;
1.109     kristaps  471:        enum rofferr     e;
1.130     kristaps  472:        int              ppos, ctl;
1.79      kristaps  473:
                    474:        /*
1.94      kristaps  475:         * Run the reserved-word filter only if we have some reserved
                    476:         * words to fill in.
                    477:         */
                    478:
1.95      kristaps  479:        if (r->first_string && ! roff_res(r, bufp, szp, pos))
1.106     kristaps  480:                return(ROFF_REPARSE);
1.94      kristaps  481:
1.130     kristaps  482:        ppos = pos;
                    483:        ctl = mandoc_getcontrol(*bufp, &pos);
                    484:
1.94      kristaps  485:        /*
1.79      kristaps  486:         * First, if a scope is open and we're not a macro, pass the
                    487:         * text through the macro's filter.  If a scope isn't open and
                    488:         * we're not a macro, just let it through.
1.125     kristaps  489:         * Finally, if there's an equation scope open, divert it into it
                    490:         * no matter our state.
1.79      kristaps  491:         */
1.74      kristaps  492:
1.130     kristaps  493:        if (r->last && ! ctl) {
1.78      kristaps  494:                t = r->last->tok;
                    495:                assert(roffs[t].text);
1.109     kristaps  496:                e = (*roffs[t].text)
                    497:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    498:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  499:                if (ROFF_CONT != e)
                    500:                        return(e);
                    501:                if (r->eqn)
1.130     kristaps  502:                        return(eqn_read(&r->eqn, ln, *bufp, pos));
1.125     kristaps  503:                if (r->tbl)
1.130     kristaps  504:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.125     kristaps  505:                return(ROFF_CONT);
1.130     kristaps  506:        } else if ( ! ctl) {
1.125     kristaps  507:                if (r->eqn)
1.130     kristaps  508:                        return(eqn_read(&r->eqn, ln, *bufp, pos));
1.109     kristaps  509:                if (r->tbl)
1.130     kristaps  510:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.67      kristaps  511:                return(ROFF_CONT);
1.125     kristaps  512:        } else if (r->eqn)
1.130     kristaps  513:                return(eqn_read(&r->eqn, ln, *bufp, ppos));
1.67      kristaps  514:
1.79      kristaps  515:        /*
                    516:         * If a scope is open, go to the child handler for that macro,
                    517:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  518:         * Don't do so if an equation is open.
1.79      kristaps  519:         */
1.78      kristaps  520:
1.79      kristaps  521:        if (r->last) {
                    522:                t = r->last->tok;
                    523:                assert(roffs[t].sub);
                    524:                return((*roffs[t].sub)
1.90      kristaps  525:                                (r, t, bufp, szp,
1.130     kristaps  526:                                 ln, ppos, pos, offs));
1.79      kristaps  527:        }
1.78      kristaps  528:
1.79      kristaps  529:        /*
                    530:         * Lastly, as we've no scope open, try to look up and execute
                    531:         * the new macro.  If no macro is found, simply return and let
                    532:         * the compilers handle it.
                    533:         */
1.67      kristaps  534:
1.106     kristaps  535:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  536:                return(ROFF_CONT);
1.67      kristaps  537:
1.75      kristaps  538:        assert(roffs[t].proc);
1.78      kristaps  539:        return((*roffs[t].proc)
1.90      kristaps  540:                        (r, t, bufp, szp,
                    541:                         ln, ppos, pos, offs));
1.74      kristaps  542: }
                    543:
                    544:
1.117     kristaps  545: void
1.74      kristaps  546: roff_endparse(struct roff *r)
                    547: {
                    548:
1.110     kristaps  549:        if (r->last)
1.128     kristaps  550:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  551:                                r->last->line, r->last->col, NULL);
1.117     kristaps  552:
1.125     kristaps  553:        if (r->eqn) {
1.128     kristaps  554:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.126     kristaps  555:                                r->eqn->eqn.line, r->eqn->eqn.pos, NULL);
1.125     kristaps  556:                eqn_end(r->eqn);
                    557:                r->eqn = NULL;
                    558:        }
                    559:
1.117     kristaps  560:        if (r->tbl) {
1.128     kristaps  561:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  562:                                r->tbl->line, r->tbl->pos, NULL);
                    563:                tbl_end(r->tbl);
                    564:                r->tbl = NULL;
                    565:        }
1.67      kristaps  566: }
                    567:
                    568: /*
                    569:  * Parse a roff node's type from the input buffer.  This must be in the
                    570:  * form of ".foo xxx" in the usual way.
                    571:  */
                    572: static enum rofft
1.106     kristaps  573: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  574: {
1.106     kristaps  575:        const char      *mac;
                    576:        size_t           maclen;
1.67      kristaps  577:        enum rofft       t;
                    578:
1.130     kristaps  579:        if ('\0' == buf[*pos] || '"' == buf[*pos])
1.67      kristaps  580:                return(ROFF_MAX);
                    581:
1.106     kristaps  582:        mac = buf + *pos;
                    583:        maclen = strcspn(mac, " \\\t\0");
1.67      kristaps  584:
1.106     kristaps  585:        t = (r->current_string = roff_getstrn(r, mac, maclen))
                    586:            ? ROFF_USERDEF : roff_hash_find(mac, maclen);
1.67      kristaps  587:
1.127     kristaps  588:        *pos += (int)maclen;
1.130     kristaps  589:
1.67      kristaps  590:        while (buf[*pos] && ' ' == buf[*pos])
                    591:                (*pos)++;
                    592:
                    593:        return(t);
                    594: }
                    595:
                    596:
1.89      kristaps  597: static int
1.91      kristaps  598: roff_parse_nat(const char *buf, unsigned int *res)
1.89      kristaps  599: {
                    600:        char            *ep;
                    601:        long             lval;
                    602:
                    603:        errno = 0;
                    604:        lval = strtol(buf, &ep, 10);
                    605:        if (buf[0] == '\0' || *ep != '\0')
                    606:                return(0);
                    607:        if ((errno == ERANGE &&
                    608:                        (lval == LONG_MAX || lval == LONG_MIN)) ||
1.91      kristaps  609:                        (lval > INT_MAX || lval < 0))
1.89      kristaps  610:                return(0);
                    611:
1.91      kristaps  612:        *res = (unsigned int)lval;
1.89      kristaps  613:        return(1);
                    614: }
                    615:
                    616:
1.67      kristaps  617: /* ARGSUSED */
                    618: static enum rofferr
1.76      kristaps  619: roff_cblock(ROFF_ARGS)
1.67      kristaps  620: {
                    621:
1.79      kristaps  622:        /*
                    623:         * A block-close `..' should only be invoked as a child of an
                    624:         * ignore macro, otherwise raise a warning and just ignore it.
                    625:         */
                    626:
1.76      kristaps  627:        if (NULL == r->last) {
1.128     kristaps  628:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  629:                return(ROFF_IGN);
                    630:        }
1.67      kristaps  631:
1.81      kristaps  632:        switch (r->last->tok) {
                    633:        case (ROFF_am):
                    634:                /* FALLTHROUGH */
                    635:        case (ROFF_ami):
                    636:                /* FALLTHROUGH */
                    637:        case (ROFF_am1):
                    638:                /* FALLTHROUGH */
                    639:        case (ROFF_de):
1.108     schwarze  640:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  641:                /* FALLTHROUGH */
                    642:        case (ROFF_dei):
                    643:                /* FALLTHROUGH */
                    644:        case (ROFF_ig):
                    645:                break;
                    646:        default:
1.128     kristaps  647:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  648:                return(ROFF_IGN);
1.76      kristaps  649:        }
1.67      kristaps  650:
1.76      kristaps  651:        if ((*bufp)[pos])
1.128     kristaps  652:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  653:
                    654:        roffnode_pop(r);
1.76      kristaps  655:        roffnode_cleanscope(r);
                    656:        return(ROFF_IGN);
1.71      kristaps  657:
1.67      kristaps  658: }
                    659:
                    660:
1.76      kristaps  661: static void
                    662: roffnode_cleanscope(struct roff *r)
1.67      kristaps  663: {
                    664:
1.76      kristaps  665:        while (r->last) {
                    666:                if (--r->last->endspan < 0)
                    667:                        break;
                    668:                roffnode_pop(r);
                    669:        }
1.67      kristaps  670: }
                    671:
                    672:
1.75      kristaps  673: /* ARGSUSED */
1.74      kristaps  674: static enum rofferr
1.75      kristaps  675: roff_ccond(ROFF_ARGS)
1.74      kristaps  676: {
                    677:
1.76      kristaps  678:        if (NULL == r->last) {
1.128     kristaps  679:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  680:                return(ROFF_IGN);
                    681:        }
                    682:
1.82      kristaps  683:        switch (r->last->tok) {
                    684:        case (ROFF_el):
                    685:                /* FALLTHROUGH */
                    686:        case (ROFF_ie):
                    687:                /* FALLTHROUGH */
                    688:        case (ROFF_if):
                    689:                break;
                    690:        default:
1.128     kristaps  691:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.75      kristaps  692:                return(ROFF_IGN);
                    693:        }
                    694:
1.76      kristaps  695:        if (r->last->endspan > -1) {
1.128     kristaps  696:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  697:                return(ROFF_IGN);
                    698:        }
                    699:
                    700:        if ((*bufp)[pos])
1.128     kristaps  701:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.76      kristaps  702:
1.75      kristaps  703:        roffnode_pop(r);
1.76      kristaps  704:        roffnode_cleanscope(r);
                    705:        return(ROFF_IGN);
                    706: }
                    707:
1.75      kristaps  708:
1.76      kristaps  709: /* ARGSUSED */
                    710: static enum rofferr
1.80      kristaps  711: roff_block(ROFF_ARGS)
1.76      kristaps  712: {
1.78      kristaps  713:        int             sv;
                    714:        size_t          sz;
1.106     kristaps  715:        char            *name;
                    716:
                    717:        name = NULL;
1.76      kristaps  718:
1.106     kristaps  719:        if (ROFF_ig != tok) {
                    720:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  721:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  722:                        return(ROFF_IGN);
                    723:                }
1.107     kristaps  724:
                    725:                /*
                    726:                 * Re-write `de1', since we don't really care about
                    727:                 * groff's strange compatibility mode, into `de'.
                    728:                 */
                    729:
1.106     kristaps  730:                if (ROFF_de1 == tok)
                    731:                        tok = ROFF_de;
                    732:                if (ROFF_de == tok)
                    733:                        name = *bufp + pos;
                    734:                else
1.128     kristaps  735:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  736:                            roffs[tok].name);
1.107     kristaps  737:
1.131     schwarze  738:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  739:                        pos++;
1.107     kristaps  740:
1.131     schwarze  741:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  742:                        (*bufp)[pos++] = '\0';
1.80      kristaps  743:        }
                    744:
1.106     kristaps  745:        roffnode_push(r, tok, name, ln, ppos);
                    746:
                    747:        /*
                    748:         * At the beginning of a `de' macro, clear the existing string
                    749:         * with the same name, if there is one.  New content will be
                    750:         * added from roff_block_text() in multiline mode.
                    751:         */
1.107     kristaps  752:
1.106     kristaps  753:        if (ROFF_de == tok)
1.108     schwarze  754:                roff_setstr(r, name, "", 0);
1.76      kristaps  755:
1.79      kristaps  756:        if ('\0' == (*bufp)[pos])
1.78      kristaps  757:                return(ROFF_IGN);
                    758:
1.107     kristaps  759:        /* If present, process the custom end-of-line marker. */
                    760:
1.78      kristaps  761:        sv = pos;
1.131     schwarze  762:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  763:                pos++;
                    764:
                    765:        /*
                    766:         * Note: groff does NOT like escape characters in the input.
                    767:         * Instead of detecting this, we're just going to let it fly and
                    768:         * to hell with it.
                    769:         */
                    770:
                    771:        assert(pos > sv);
                    772:        sz = (size_t)(pos - sv);
                    773:
1.79      kristaps  774:        if (1 == sz && '.' == (*bufp)[sv])
                    775:                return(ROFF_IGN);
                    776:
1.98      schwarze  777:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  778:
                    779:        memcpy(r->last->end, *bufp + sv, sz);
                    780:        r->last->end[(int)sz] = '\0';
                    781:
1.77      kristaps  782:        if ((*bufp)[pos])
1.128     kristaps  783:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  784:
1.78      kristaps  785:        return(ROFF_IGN);
                    786: }
                    787:
                    788:
                    789: /* ARGSUSED */
                    790: static enum rofferr
1.80      kristaps  791: roff_block_sub(ROFF_ARGS)
1.79      kristaps  792: {
                    793:        enum rofft      t;
                    794:        int             i, j;
                    795:
                    796:        /*
                    797:         * First check whether a custom macro exists at this level.  If
                    798:         * it does, then check against it.  This is some of groff's
                    799:         * stranger behaviours.  If we encountered a custom end-scope
                    800:         * tag and that tag also happens to be a "real" macro, then we
                    801:         * need to try interpreting it again as a real macro.  If it's
                    802:         * not, then return ignore.  Else continue.
                    803:         */
                    804:
                    805:        if (r->last->end) {
1.130     kristaps  806:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  807:                        if ((*bufp)[i] != r->last->end[j])
                    808:                                break;
                    809:
                    810:                if ('\0' == r->last->end[j] &&
                    811:                                ('\0' == (*bufp)[i] ||
                    812:                                 ' ' == (*bufp)[i] ||
                    813:                                 '\t' == (*bufp)[i])) {
                    814:                        roffnode_pop(r);
                    815:                        roffnode_cleanscope(r);
                    816:
1.130     kristaps  817:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                    818:                                i++;
                    819:
                    820:                        pos = i;
1.106     kristaps  821:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps  822:                                return(ROFF_RERUN);
                    823:                        return(ROFF_IGN);
                    824:                }
                    825:        }
                    826:
                    827:        /*
                    828:         * If we have no custom end-query or lookup failed, then try
                    829:         * pulling it out of the hashtable.
                    830:         */
                    831:
1.130     kristaps  832:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
                    833:                return(ROFF_IGN);
1.79      kristaps  834:
1.106     kristaps  835:        /*
                    836:         * Macros other than block-end are only significant
                    837:         * in `de' blocks; elsewhere, simply throw them away.
                    838:         */
                    839:        if (ROFF_cblock != t) {
                    840:                if (ROFF_de == tok)
                    841:                        roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79      kristaps  842:                return(ROFF_IGN);
1.106     kristaps  843:        }
1.79      kristaps  844:
                    845:        assert(roffs[t].proc);
1.90      kristaps  846:        return((*roffs[t].proc)(r, t, bufp, szp,
                    847:                                ln, ppos, pos, offs));
1.79      kristaps  848: }
                    849:
                    850:
                    851: /* ARGSUSED */
                    852: static enum rofferr
1.80      kristaps  853: roff_block_text(ROFF_ARGS)
1.78      kristaps  854: {
                    855:
1.106     kristaps  856:        if (ROFF_de == tok)
                    857:                roff_setstr(r, r->last->name, *bufp + pos, 1);
                    858:
1.78      kristaps  859:        return(ROFF_IGN);
                    860: }
                    861:
                    862:
                    863: /* ARGSUSED */
                    864: static enum rofferr
1.82      kristaps  865: roff_cond_sub(ROFF_ARGS)
                    866: {
                    867:        enum rofft       t;
                    868:        enum roffrule    rr;
                    869:
                    870:        rr = r->last->rule;
                    871:
1.87      kristaps  872:        /*
                    873:         * Clean out scope.  If we've closed ourselves, then don't
                    874:         * continue.
                    875:         */
                    876:
                    877:        roffnode_cleanscope(r);
1.82      kristaps  878:
1.106     kristaps  879:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
1.100     kristaps  880:                if ('\\' == (*bufp)[pos] && '}' == (*bufp)[pos + 1])
                    881:                        return(roff_ccond
1.106     kristaps  882:                                (r, ROFF_ccond, bufp, szp,
1.100     kristaps  883:                                 ln, pos, pos + 2, offs));
1.82      kristaps  884:                return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.100     kristaps  885:        }
1.82      kristaps  886:
                    887:        /*
                    888:         * A denied conditional must evaluate its children if and only
                    889:         * if they're either structurally required (such as loops and
                    890:         * conditionals) or a closing macro.
                    891:         */
                    892:        if (ROFFRULE_DENY == rr)
                    893:                if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
                    894:                        if (ROFF_ccond != t)
                    895:                                return(ROFF_IGN);
                    896:
                    897:        assert(roffs[t].proc);
1.90      kristaps  898:        return((*roffs[t].proc)(r, t, bufp, szp,
                    899:                                ln, ppos, pos, offs));
1.82      kristaps  900: }
                    901:
                    902:
                    903: /* ARGSUSED */
                    904: static enum rofferr
                    905: roff_cond_text(ROFF_ARGS)
1.78      kristaps  906: {
                    907:        char            *ep, *st;
1.82      kristaps  908:        enum roffrule    rr;
                    909:
                    910:        rr = r->last->rule;
                    911:
                    912:        /*
                    913:         * We display the value of the text if out current evaluation
                    914:         * scope permits us to do so.
                    915:         */
1.100     kristaps  916:
                    917:        /* FIXME: use roff_ccond? */
1.78      kristaps  918:
                    919:        st = &(*bufp)[pos];
                    920:        if (NULL == (ep = strstr(st, "\\}"))) {
                    921:                roffnode_cleanscope(r);
1.82      kristaps  922:                return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.78      kristaps  923:        }
                    924:
1.86      kristaps  925:        if (ep == st || (ep > st && '\\' != *(ep - 1)))
1.78      kristaps  926:                roffnode_pop(r);
                    927:
                    928:        roffnode_cleanscope(r);
1.82      kristaps  929:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74      kristaps  930: }
                    931:
                    932:
1.88      kristaps  933: static enum roffrule
                    934: roff_evalcond(const char *v, int *pos)
                    935: {
                    936:
                    937:        switch (v[*pos]) {
                    938:        case ('n'):
                    939:                (*pos)++;
                    940:                return(ROFFRULE_ALLOW);
                    941:        case ('e'):
                    942:                /* FALLTHROUGH */
                    943:        case ('o'):
                    944:                /* FALLTHROUGH */
                    945:        case ('t'):
                    946:                (*pos)++;
                    947:                return(ROFFRULE_DENY);
                    948:        default:
                    949:                break;
                    950:        }
                    951:
                    952:        while (v[*pos] && ' ' != v[*pos])
                    953:                (*pos)++;
                    954:        return(ROFFRULE_DENY);
                    955: }
                    956:
1.75      kristaps  957: /* ARGSUSED */
1.74      kristaps  958: static enum rofferr
1.103     kristaps  959: roff_line_ignore(ROFF_ARGS)
1.89      kristaps  960: {
1.123     schwarze  961:
                    962:        if (ROFF_it == tok)
1.128     kristaps  963:                mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, "it");
1.89      kristaps  964:
                    965:        return(ROFF_IGN);
                    966: }
                    967:
1.104     kristaps  968: /* ARGSUSED */
                    969: static enum rofferr
1.82      kristaps  970: roff_cond(ROFF_ARGS)
1.74      kristaps  971: {
1.77      kristaps  972:        int              sv;
1.88      kristaps  973:        enum roffrule    rule;
1.74      kristaps  974:
1.134     kristaps  975:        /*
                    976:         * An `.el' has no conditional body: it will consume the value
                    977:         * of the current rstack entry set in prior `ie' calls or
                    978:         * defaults to DENY.
                    979:         *
                    980:         * If we're not an `el', however, then evaluate the conditional.
                    981:         */
1.133     kristaps  982:
1.134     kristaps  983:        rule = ROFF_el == tok ?
                    984:                (r->rstackpos < 0 ?
                    985:                 ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
                    986:                roff_evalcond(*bufp, &pos);
1.77      kristaps  987:
                    988:        sv = pos;
1.75      kristaps  989:        while (' ' == (*bufp)[pos])
                    990:                pos++;
1.74      kristaps  991:
1.77      kristaps  992:        /*
                    993:         * Roff is weird.  If we have just white-space after the
                    994:         * conditional, it's considered the BODY and we exit without
                    995:         * really doing anything.  Warn about this.  It's probably
                    996:         * wrong.
                    997:         */
1.88      kristaps  998:
1.77      kristaps  999:        if ('\0' == (*bufp)[pos] && sv != pos) {
1.128     kristaps 1000:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.107     kristaps 1001:                return(ROFF_IGN);
1.77      kristaps 1002:        }
                   1003:
1.106     kristaps 1004:        roffnode_push(r, tok, NULL, ln, ppos);
1.77      kristaps 1005:
1.88      kristaps 1006:        r->last->rule = rule;
                   1007:
1.134     kristaps 1008:        /*
                   1009:         * An if-else will put the NEGATION of the current evaluated
                   1010:         * conditional into the stack of rules.
                   1011:         */
                   1012:
1.84      schwarze 1013:        if (ROFF_ie == tok) {
1.134     kristaps 1014:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1015:                        mandoc_msg(MANDOCERR_MEM,
                   1016:                                r->parse, ln, ppos, NULL);
                   1017:                        return(ROFF_ERR);
                   1018:                }
                   1019:                r->rstack[++r->rstackpos] =
                   1020:                        ROFFRULE_DENY == r->last->rule ?
                   1021:                        ROFFRULE_ALLOW : ROFFRULE_DENY;
1.82      kristaps 1022:        }
1.88      kristaps 1023:
                   1024:        /* If the parent has false as its rule, then so do we. */
                   1025:
1.109     kristaps 1026:        if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
1.84      schwarze 1027:                r->last->rule = ROFFRULE_DENY;
1.88      kristaps 1028:
                   1029:        /*
                   1030:         * Determine scope.  If we're invoked with "\{" trailing the
                   1031:         * conditional, then we're in a multiline scope.  Else our scope
                   1032:         * expires on the next line.
                   1033:         */
1.74      kristaps 1034:
1.75      kristaps 1035:        r->last->endspan = 1;
                   1036:
                   1037:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1038:                r->last->endspan = -1;
                   1039:                pos += 2;
1.109     kristaps 1040:        }
1.74      kristaps 1041:
1.77      kristaps 1042:        /*
                   1043:         * If there are no arguments on the line, the next-line scope is
                   1044:         * assumed.
                   1045:         */
                   1046:
1.75      kristaps 1047:        if ('\0' == (*bufp)[pos])
                   1048:                return(ROFF_IGN);
1.77      kristaps 1049:
                   1050:        /* Otherwise re-run the roff parser after recalculating. */
1.74      kristaps 1051:
1.75      kristaps 1052:        *offs = pos;
                   1053:        return(ROFF_RERUN);
1.83      schwarze 1054: }
                   1055:
                   1056:
                   1057: /* ARGSUSED */
                   1058: static enum rofferr
1.92      schwarze 1059: roff_ds(ROFF_ARGS)
                   1060: {
1.96      kristaps 1061:        char            *name, *string;
                   1062:
                   1063:        /*
                   1064:         * A symbol is named by the first word following the macro
                   1065:         * invocation up to a space.  Its value is anything after the
                   1066:         * name's trailing whitespace and optional double-quote.  Thus,
                   1067:         *
                   1068:         *  [.ds foo "bar  "     ]
                   1069:         *
                   1070:         * will have `bar  "     ' as its value.
                   1071:         */
1.92      schwarze 1072:
1.121     schwarze 1073:        string = *bufp + pos;
                   1074:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1075:        if ('\0' == *name)
                   1076:                return(ROFF_IGN);
                   1077:
1.121     schwarze 1078:        /* Read past initial double-quote. */
                   1079:        if ('"' == *string)
1.92      schwarze 1080:                string++;
                   1081:
1.96      kristaps 1082:        /* The rest is the value. */
1.106     kristaps 1083:        roff_setstr(r, name, string, 0);
1.92      schwarze 1084:        return(ROFF_IGN);
                   1085: }
                   1086:
                   1087:
                   1088: /* ARGSUSED */
                   1089: static enum rofferr
1.89      kristaps 1090: roff_nr(ROFF_ARGS)
1.83      schwarze 1091: {
1.121     schwarze 1092:        const char      *key;
                   1093:        char            *val;
1.91      kristaps 1094:        struct reg      *rg;
1.89      kristaps 1095:
1.121     schwarze 1096:        val = *bufp + pos;
                   1097:        key = roff_getname(r, &val, ln, pos);
1.91      kristaps 1098:        rg = r->regs->regs;
1.89      kristaps 1099:
                   1100:        if (0 == strcmp(key, "nS")) {
1.91      kristaps 1101:                rg[(int)REG_nS].set = 1;
                   1102:                if ( ! roff_parse_nat(val, &rg[(int)REG_nS].v.u))
                   1103:                        rg[(int)REG_nS].v.u = 0;
1.109     kristaps 1104:        }
                   1105:
1.122     schwarze 1106:        return(ROFF_IGN);
                   1107: }
                   1108:
                   1109: /* ARGSUSED */
                   1110: static enum rofferr
                   1111: roff_rm(ROFF_ARGS)
                   1112: {
                   1113:        const char       *name;
                   1114:        char             *cp;
                   1115:
                   1116:        cp = *bufp + pos;
                   1117:        while ('\0' != *cp) {
1.127     kristaps 1118:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1119:                if ('\0' != *name)
                   1120:                        roff_setstr(r, name, NULL, 0);
                   1121:        }
1.109     kristaps 1122:        return(ROFF_IGN);
                   1123: }
                   1124:
                   1125: /* ARGSUSED */
                   1126: static enum rofferr
                   1127: roff_TE(ROFF_ARGS)
                   1128: {
                   1129:
                   1130:        if (NULL == r->tbl)
1.128     kristaps 1131:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1132:        else
                   1133:                tbl_end(r->tbl);
1.109     kristaps 1134:
                   1135:        r->tbl = NULL;
1.112     kristaps 1136:        return(ROFF_IGN);
                   1137: }
                   1138:
                   1139: /* ARGSUSED */
                   1140: static enum rofferr
                   1141: roff_T_(ROFF_ARGS)
                   1142: {
                   1143:
                   1144:        if (NULL == r->tbl)
1.128     kristaps 1145:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1146:        else
1.116     kristaps 1147:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1148:
1.109     kristaps 1149:        return(ROFF_IGN);
                   1150: }
                   1151:
                   1152: /* ARGSUSED */
                   1153: static enum rofferr
1.125     kristaps 1154: roff_EQ(ROFF_ARGS)
                   1155: {
                   1156:        struct eqn_node *e;
                   1157:
                   1158:        assert(NULL == r->eqn);
                   1159:        e = eqn_alloc(ppos, ln);
                   1160:
                   1161:        if (r->last_eqn)
                   1162:                r->last_eqn->next = e;
                   1163:        else
                   1164:                r->first_eqn = r->last_eqn = e;
                   1165:
                   1166:        r->eqn = r->last_eqn = e;
                   1167:        return(ROFF_IGN);
                   1168: }
                   1169:
                   1170: /* ARGSUSED */
                   1171: static enum rofferr
                   1172: roff_EN(ROFF_ARGS)
                   1173: {
                   1174:
1.128     kristaps 1175:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1176:        return(ROFF_IGN);
                   1177: }
                   1178:
                   1179: /* ARGSUSED */
                   1180: static enum rofferr
1.109     kristaps 1181: roff_TS(ROFF_ARGS)
                   1182: {
1.118     kristaps 1183:        struct tbl_node *t;
1.89      kristaps 1184:
1.115     kristaps 1185:        if (r->tbl) {
1.128     kristaps 1186:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.115     kristaps 1187:                tbl_end(r->tbl);
                   1188:        }
1.83      schwarze 1189:
1.128     kristaps 1190:        t = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1191:
                   1192:        if (r->last_tbl)
                   1193:                r->last_tbl->next = t;
                   1194:        else
                   1195:                r->first_tbl = r->last_tbl = t;
                   1196:
                   1197:        r->tbl = r->last_tbl = t;
1.83      schwarze 1198:        return(ROFF_IGN);
1.92      schwarze 1199: }
                   1200:
1.105     kristaps 1201: /* ARGSUSED */
                   1202: static enum rofferr
                   1203: roff_so(ROFF_ARGS)
                   1204: {
                   1205:        char *name;
                   1206:
1.128     kristaps 1207:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1208:
                   1209:        /*
                   1210:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1211:         * opening anything that's not in our cwd or anything beneath
                   1212:         * it.  Thus, explicitly disallow traversing up the file-system
                   1213:         * or using absolute paths.
                   1214:         */
                   1215:
                   1216:        name = *bufp + pos;
                   1217:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1218:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1219:                return(ROFF_ERR);
                   1220:        }
                   1221:
                   1222:        *offs = pos;
                   1223:        return(ROFF_SO);
                   1224: }
1.92      schwarze 1225:
1.106     kristaps 1226: /* ARGSUSED */
                   1227: static enum rofferr
                   1228: roff_userdef(ROFF_ARGS)
1.99      kristaps 1229: {
1.106     kristaps 1230:        const char       *arg[9];
                   1231:        char             *cp, *n1, *n2;
1.119     schwarze 1232:        int               i;
1.106     kristaps 1233:
                   1234:        /*
                   1235:         * Collect pointers to macro argument strings
                   1236:         * and null-terminate them.
                   1237:         */
                   1238:        cp = *bufp + pos;
1.119     schwarze 1239:        for (i = 0; i < 9; i++)
1.120     schwarze 1240:                arg[i] = '\0' == *cp ? "" :
1.136   ! kristaps 1241:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1242:
1.106     kristaps 1243:        /*
                   1244:         * Expand macro arguments.
1.99      kristaps 1245:         */
1.106     kristaps 1246:        *szp = 0;
                   1247:        n1 = cp = mandoc_strdup(r->current_string);
                   1248:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1249:                i = cp[2] - '1';
                   1250:                if (0 > i || 8 < i) {
                   1251:                        /* Not an argument invocation. */
                   1252:                        cp += 2;
                   1253:                        continue;
                   1254:                }
                   1255:
                   1256:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1257:                n2 = mandoc_malloc(*szp);
                   1258:
                   1259:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1260:                strlcat(n2, arg[i], *szp);
                   1261:                strlcat(n2, cp + 3, *szp);
                   1262:
                   1263:                cp = n2 + (cp - n1);
                   1264:                free(n1);
                   1265:                n1 = n2;
1.99      kristaps 1266:        }
                   1267:
1.106     kristaps 1268:        /*
                   1269:         * Replace the macro invocation
                   1270:         * by the expanded macro.
                   1271:         */
                   1272:        free(*bufp);
                   1273:        *bufp = n1;
                   1274:        if (0 == *szp)
                   1275:                *szp = strlen(*bufp) + 1;
                   1276:
                   1277:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   1278:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 1279: }
1.121     schwarze 1280:
                   1281: static char *
                   1282: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   1283: {
                   1284:        char     *name, *cp;
                   1285:
                   1286:        name = *cpp;
                   1287:        if ('\0' == *name)
                   1288:                return(name);
                   1289:
                   1290:        /* Read until end of name. */
                   1291:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   1292:                if ('\\' != *cp)
                   1293:                        continue;
                   1294:                cp++;
                   1295:                if ('\\' == *cp)
                   1296:                        continue;
1.128     kristaps 1297:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 1298:                *cp = '\0';
                   1299:                name = cp;
                   1300:        }
                   1301:
                   1302:        /* Nil-terminate name. */
                   1303:        if ('\0' != *cp)
                   1304:                *(cp++) = '\0';
                   1305:
                   1306:        /* Read past spaces. */
                   1307:        while (' ' == *cp)
                   1308:                cp++;
                   1309:
                   1310:        *cpp = cp;
                   1311:        return(name);
                   1312: }
                   1313:
1.106     kristaps 1314: /*
                   1315:  * Store *string into the user-defined string called *name.
                   1316:  * In multiline mode, append to an existing entry and append '\n';
                   1317:  * else replace the existing entry, if there is one.
                   1318:  * To clear an existing entry, call with (*r, *name, NULL, 0).
                   1319:  */
1.94      kristaps 1320: static void
1.106     kristaps 1321: roff_setstr(struct roff *r, const char *name, const char *string,
                   1322:        int multiline)
1.92      schwarze 1323: {
                   1324:        struct roffstr   *n;
1.106     kristaps 1325:        char             *c;
                   1326:        size_t            oldch, newch;
1.92      schwarze 1327:
1.106     kristaps 1328:        /* Search for an existing string with the same name. */
1.94      kristaps 1329:        n = r->first_string;
1.92      schwarze 1330:        while (n && strcmp(name, n->name))
                   1331:                n = n->next;
1.94      kristaps 1332:
                   1333:        if (NULL == n) {
1.106     kristaps 1334:                /* Create a new string table entry. */
1.94      kristaps 1335:                n = mandoc_malloc(sizeof(struct roffstr));
1.106     kristaps 1336:                n->name = mandoc_strdup(name);
                   1337:                n->string = NULL;
1.94      kristaps 1338:                n->next = r->first_string;
                   1339:                r->first_string = n;
1.106     kristaps 1340:        } else if (0 == multiline) {
                   1341:                /* In multiline mode, append; else replace. */
1.92      schwarze 1342:                free(n->string);
1.106     kristaps 1343:                n->string = NULL;
                   1344:        }
                   1345:
                   1346:        if (NULL == string)
                   1347:                return;
                   1348:
                   1349:        /*
                   1350:         * One additional byte for the '\n' in multiline mode,
                   1351:         * and one for the terminating '\0'.
                   1352:         */
1.127     kristaps 1353:        newch = strlen(string) + (multiline ? 2u : 1u);
1.106     kristaps 1354:        if (NULL == n->string) {
                   1355:                n->string = mandoc_malloc(newch);
                   1356:                *n->string = '\0';
                   1357:                oldch = 0;
                   1358:        } else {
                   1359:                oldch = strlen(n->string);
                   1360:                n->string = mandoc_realloc(n->string, oldch + newch);
                   1361:        }
                   1362:
                   1363:        /* Skip existing content in the destination buffer. */
1.127     kristaps 1364:        c = n->string + (int)oldch;
1.106     kristaps 1365:
                   1366:        /* Append new content to the destination buffer. */
                   1367:        while (*string) {
                   1368:                /*
                   1369:                 * Rudimentary roff copy mode:
                   1370:                 * Handle escaped backslashes.
                   1371:                 */
                   1372:                if ('\\' == *string && '\\' == *(string + 1))
                   1373:                        string++;
                   1374:                *c++ = *string++;
                   1375:        }
1.94      kristaps 1376:
1.106     kristaps 1377:        /* Append terminating bytes. */
                   1378:        if (multiline)
                   1379:                *c++ = '\n';
                   1380:        *c = '\0';
1.92      schwarze 1381: }
                   1382:
1.94      kristaps 1383: static const char *
                   1384: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 1385: {
1.94      kristaps 1386:        const struct roffstr *n;
1.92      schwarze 1387:
1.94      kristaps 1388:        n = r->first_string;
1.97      kristaps 1389:        while (n && (strncmp(name, n->name, len) || '\0' != n->name[(int)len]))
1.92      schwarze 1390:                n = n->next;
1.94      kristaps 1391:
                   1392:        return(n ? n->string : NULL);
1.92      schwarze 1393: }
                   1394:
1.94      kristaps 1395: static void
                   1396: roff_freestr(struct roff *r)
1.92      schwarze 1397: {
                   1398:        struct roffstr   *n, *nn;
                   1399:
1.94      kristaps 1400:        for (n = r->first_string; n; n = nn) {
1.92      schwarze 1401:                free(n->name);
                   1402:                free(n->string);
                   1403:                nn = n->next;
                   1404:                free(n);
                   1405:        }
1.94      kristaps 1406:
                   1407:        r->first_string = NULL;
1.114     kristaps 1408: }
                   1409:
                   1410: const struct tbl_span *
                   1411: roff_span(const struct roff *r)
                   1412: {
                   1413:
                   1414:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 1415: }
                   1416:
                   1417: const struct eqn *
                   1418: roff_eqn(const struct roff *r)
                   1419: {
                   1420:
                   1421:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.74      kristaps 1422: }

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