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Annotation of mandoc/mdoc.c, Revision 1.67

1.67    ! kristaps    1: /* $Id: mdoc.c,v 1.66 2009/03/16 23:37:28 kristaps Exp $ */
1.1       kristaps    2: /*
1.66      kristaps    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
1.1       kristaps    4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the
                      7:  * above copyright notice and this permission notice appear in all
                      8:  * copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
                     11:  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
                     12:  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
                     13:  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     14:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     15:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
                     16:  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
                     17:  * PERFORMANCE OF THIS SOFTWARE.
                     18:  */
                     19: #include <assert.h>
                     20: #include <ctype.h>
                     21: #include <err.h>
                     22: #include <stdarg.h>
                     23: #include <stdlib.h>
                     24: #include <stdio.h>
                     25: #include <string.h>
                     26:
                     27: #include "private.h"
                     28:
1.41      kristaps   29: /*
                     30:  * Main caller in the libmdoc library.  This begins the parsing routine,
                     31:  * handles allocation of data, and so forth.  Most of the "work" is done
1.48      kristaps   32:  * in macro.c and validate.c.
1.41      kristaps   33:  */
                     34:
1.48      kristaps   35: static struct mdoc_node *mdoc_node_alloc(const struct mdoc *);
                     36: static int               mdoc_node_append(struct mdoc *,
                     37:                                struct mdoc_node *);
1.53      kristaps   38:
                     39: static int               parsetext(struct mdoc *, int, char *);
                     40: static int               parsemacro(struct mdoc *, int, char *);
1.58      kristaps   41: static int               macrowarn(struct mdoc *, int, const char *);
1.48      kristaps   42:
                     43:
1.1       kristaps   44: const  char *const __mdoc_macronames[MDOC_MAX] = {
                     45:        "\\\"",         "Dd",           "Dt",           "Os",
                     46:        "Sh",           "Ss",           "Pp",           "D1",
                     47:        "Dl",           "Bd",           "Ed",           "Bl",
                     48:        "El",           "It",           "Ad",           "An",
                     49:        "Ar",           "Cd",           "Cm",           "Dv",
                     50:        "Er",           "Ev",           "Ex",           "Fa",
                     51:        "Fd",           "Fl",           "Fn",           "Ft",
                     52:        "Ic",           "In",           "Li",           "Nd",
                     53:        "Nm",           "Op",           "Ot",           "Pa",
                     54:        "Rv",           "St",           "Va",           "Vt",
                     55:        /* LINTED */
                     56:        "Xr",           "\%A",          "\%B",          "\%D",
                     57:        /* LINTED */
                     58:        "\%I",          "\%J",          "\%N",          "\%O",
                     59:        /* LINTED */
                     60:        "\%P",          "\%R",          "\%T",          "\%V",
                     61:        "Ac",           "Ao",           "Aq",           "At",
                     62:        "Bc",           "Bf",           "Bo",           "Bq",
                     63:        "Bsx",          "Bx",           "Db",           "Dc",
                     64:        "Do",           "Dq",           "Ec",           "Ef",
                     65:        "Em",           "Eo",           "Fx",           "Ms",
                     66:        "No",           "Ns",           "Nx",           "Ox",
                     67:        "Pc",           "Pf",           "Po",           "Pq",
                     68:        "Qc",           "Ql",           "Qo",           "Qq",
                     69:        "Re",           "Rs",           "Sc",           "So",
                     70:        "Sq",           "Sm",           "Sx",           "Sy",
                     71:        "Tn",           "Ux",           "Xc",           "Xo",
                     72:        "Fo",           "Fc",           "Oo",           "Oc",
                     73:        "Bk",           "Ek",           "Bt",           "Hf",
1.57      kristaps   74:        "Fr",           "Ud",           "Lb",           "Ap",
1.61      kristaps   75:        "Lp",           "Lk",           "Mt",           "Brq",
1.64      kristaps   76:        /* LINTED */
1.65      kristaps   77:        "Bro",          "Brc",          "\%C",          "Es",
1.66      kristaps   78:        "En",           "Dx"
1.1       kristaps   79:        };
                     80:
                     81: const  char *const __mdoc_argnames[MDOC_ARG_MAX] = {
                     82:        "split",                "nosplit",              "ragged",
                     83:        "unfilled",             "literal",              "file",
                     84:        "offset",               "bullet",               "dash",
                     85:        "hyphen",               "item",                 "enum",
                     86:        "tag",                  "diag",                 "hang",
                     87:        "ohang",                "inset",                "column",
                     88:        "width",                "compact",              "std",
1.52      kristaps   89:        "filled",               "words",                "emphasis",
1.64      kristaps   90:        "symbolic",             "nested"
1.1       kristaps   91:        };
                     92:
                     93: const  char * const *mdoc_macronames = __mdoc_macronames;
                     94: const  char * const *mdoc_argnames = __mdoc_argnames;
                     95:
1.45      kristaps   96:
1.1       kristaps   97: const struct mdoc_node *
1.47      kristaps   98: mdoc_node(const struct mdoc *mdoc)
1.1       kristaps   99: {
                    100:
                    101:        return(mdoc->first);
                    102: }
                    103:
                    104:
1.37      kristaps  105: const struct mdoc_meta *
1.47      kristaps  106: mdoc_meta(const struct mdoc *mdoc)
1.37      kristaps  107: {
                    108:
                    109:        return(&mdoc->meta);
                    110: }
                    111:
                    112:
1.1       kristaps  113: void
1.67    ! kristaps  114: mdoc_reset(struct mdoc *mdoc)
        !           115: {
        !           116:
        !           117:        if (mdoc->first)
        !           118:                mdoc_node_freelist(mdoc->first);
        !           119:        if (mdoc->meta.title)
        !           120:                free(mdoc->meta.title);
        !           121:        if (mdoc->meta.os)
        !           122:                free(mdoc->meta.os);
        !           123:        if (mdoc->meta.name)
        !           124:                free(mdoc->meta.name);
        !           125:        if (mdoc->meta.arch)
        !           126:                free(mdoc->meta.arch);
        !           127:        if (mdoc->meta.vol)
        !           128:                free(mdoc->meta.vol);
        !           129:
        !           130:        bzero(&mdoc->meta, sizeof(struct mdoc_meta));
        !           131:        mdoc->flags = 0;
        !           132:        mdoc->lastnamed = mdoc->lastsec = 0;
        !           133:
        !           134:        mdoc->first = mdoc->last =
        !           135:                xcalloc(1, sizeof(struct mdoc_node));
        !           136:        mdoc->last->type = MDOC_ROOT;
        !           137:        mdoc->next = MDOC_NEXT_CHILD;
        !           138: }
        !           139:
        !           140:
        !           141: void
1.38      kristaps  142: mdoc_free(struct mdoc *mdoc)
1.34      kristaps  143: {
                    144:
1.38      kristaps  145:        if (mdoc->first)
                    146:                mdoc_node_freelist(mdoc->first);
                    147:        if (mdoc->htab)
                    148:                mdoc_tokhash_free(mdoc->htab);
1.34      kristaps  149:        if (mdoc->meta.title)
                    150:                free(mdoc->meta.title);
                    151:        if (mdoc->meta.os)
                    152:                free(mdoc->meta.os);
                    153:        if (mdoc->meta.name)
                    154:                free(mdoc->meta.name);
1.52      kristaps  155:        if (mdoc->meta.arch)
                    156:                free(mdoc->meta.arch);
                    157:        if (mdoc->meta.vol)
                    158:                free(mdoc->meta.vol);
1.34      kristaps  159:
1.1       kristaps  160:        free(mdoc);
                    161: }
                    162:
                    163:
                    164: struct mdoc *
1.55      kristaps  165: mdoc_alloc(void *data, int pflags, const struct mdoc_cb *cb)
1.1       kristaps  166: {
                    167:        struct mdoc     *p;
                    168:
                    169:        p = xcalloc(1, sizeof(struct mdoc));
                    170:
                    171:        p->data = data;
1.33      kristaps  172:        if (cb)
                    173:                (void)memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
1.1       kristaps  174:
1.67    ! kristaps  175:        p->last = p->first =
        !           176:                xcalloc(1, sizeof(struct mdoc_node));
1.25      kristaps  177:        p->last->type = MDOC_ROOT;
1.55      kristaps  178:        p->pflags = pflags;
1.25      kristaps  179:        p->next = MDOC_NEXT_CHILD;
1.4       kristaps  180:        p->htab = mdoc_tokhash_alloc();
1.1       kristaps  181:        return(p);
                    182: }
                    183:
                    184:
                    185: int
1.20      kristaps  186: mdoc_endparse(struct mdoc *mdoc)
                    187: {
                    188:
                    189:        if (MDOC_HALT & mdoc->flags)
                    190:                return(0);
                    191:        if (NULL == mdoc->first)
                    192:                return(1);
                    193:
                    194:        assert(mdoc->last);
                    195:        if ( ! macro_end(mdoc)) {
                    196:                mdoc->flags |= MDOC_HALT;
                    197:                return(0);
                    198:        }
                    199:        return(1);
                    200: }
                    201:
                    202:
1.50      kristaps  203: /*
1.53      kristaps  204:  * Main parse routine.  Parses a single line -- really just hands off to
                    205:  * the macro or text parser.
1.50      kristaps  206:  */
1.20      kristaps  207: int
1.53      kristaps  208: mdoc_parseln(struct mdoc *m, int ln, char *buf)
1.1       kristaps  209: {
                    210:
1.53      kristaps  211:        /* If in error-mode, then we parse no more. */
1.50      kristaps  212:
1.53      kristaps  213:        if (MDOC_HALT & m->flags)
1.20      kristaps  214:                return(0);
1.50      kristaps  215:
1.53      kristaps  216:        return('.' == *buf ? parsemacro(m, ln, buf) :
                    217:                        parsetext(m, ln, buf));
1.1       kristaps  218: }
                    219:
                    220:
                    221: void
1.31      kristaps  222: mdoc_vmsg(struct mdoc *mdoc, int ln, int pos, const char *fmt, ...)
1.1       kristaps  223: {
1.31      kristaps  224:        char              buf[256];
1.23      kristaps  225:        va_list           ap;
1.1       kristaps  226:
                    227:        if (NULL == mdoc->cb.mdoc_msg)
                    228:                return;
                    229:
                    230:        va_start(ap, fmt);
1.31      kristaps  231:        (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1.1       kristaps  232:        va_end(ap);
1.31      kristaps  233:        (*mdoc->cb.mdoc_msg)(mdoc->data, ln, pos, buf);
1.1       kristaps  234: }
                    235:
                    236:
                    237: int
1.31      kristaps  238: mdoc_verr(struct mdoc *mdoc, int ln, int pos,
                    239:                const char *fmt, ...)
1.1       kristaps  240: {
1.31      kristaps  241:        char             buf[256];
                    242:        va_list          ap;
1.1       kristaps  243:
                    244:        if (NULL == mdoc->cb.mdoc_err)
                    245:                return(0);
1.31      kristaps  246:
                    247:        va_start(ap, fmt);
                    248:        (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
                    249:        va_end(ap);
                    250:        return((*mdoc->cb.mdoc_err)(mdoc->data, ln, pos, buf));
1.1       kristaps  251: }
                    252:
                    253:
                    254: int
1.31      kristaps  255: mdoc_vwarn(struct mdoc *mdoc, int ln, int pos,
                    256:                enum mdoc_warn type, const char *fmt, ...)
1.1       kristaps  257: {
1.31      kristaps  258:        char             buf[256];
                    259:        va_list          ap;
1.1       kristaps  260:
                    261:        if (NULL == mdoc->cb.mdoc_warn)
                    262:                return(0);
1.31      kristaps  263:
                    264:        va_start(ap, fmt);
                    265:        (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
                    266:        va_end(ap);
                    267:        return((*mdoc->cb.mdoc_warn)(mdoc->data, ln, pos, type, buf));
1.1       kristaps  268: }
                    269:
                    270:
                    271: int
1.53      kristaps  272: mdoc_macro(struct mdoc *m, int tok,
                    273:                int ln, int pp, int *pos, char *buf)
1.1       kristaps  274: {
                    275:
1.53      kristaps  276:        /* FIXME - these should happen during validation. */
1.31      kristaps  277:
1.44      kristaps  278:        if (MDOC_PROLOGUE & mdoc_macros[tok].flags &&
1.53      kristaps  279:                        SEC_PROLOGUE != m->lastnamed)
                    280:                return(mdoc_perr(m, ln, pp,
                    281:                                "disallowed in document body"));
                    282:
1.44      kristaps  283:        if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) &&
1.53      kristaps  284:                        SEC_PROLOGUE == m->lastnamed)
                    285:                return(mdoc_perr(m, ln, pp,
                    286:                                "disallowed in prologue"));
                    287:
                    288:        if (1 != pp && ! (MDOC_CALLABLE & mdoc_macros[tok].flags))
1.64      kristaps  289:                return(mdoc_perr(m, ln, pp, "%s not callable",
                    290:                                        mdoc_macronames[tok]));
1.53      kristaps  291:
                    292:        return((*mdoc_macros[tok].fp)(m, tok, ln, pp, pos, buf));
1.1       kristaps  293: }
                    294:
                    295:
1.23      kristaps  296: static int
                    297: mdoc_node_append(struct mdoc *mdoc, struct mdoc_node *p)
1.1       kristaps  298: {
                    299:
1.25      kristaps  300:        assert(mdoc->last);
                    301:        assert(mdoc->first);
                    302:        assert(MDOC_ROOT != p->type);
1.1       kristaps  303:
1.13      kristaps  304:        switch (mdoc->next) {
                    305:        case (MDOC_NEXT_SIBLING):
1.6       kristaps  306:                mdoc->last->next = p;
                    307:                p->prev = mdoc->last;
1.13      kristaps  308:                p->parent = mdoc->last->parent;
1.1       kristaps  309:                break;
1.13      kristaps  310:        case (MDOC_NEXT_CHILD):
                    311:                mdoc->last->child = p;
1.1       kristaps  312:                p->parent = mdoc->last;
                    313:                break;
                    314:        default:
1.13      kristaps  315:                abort();
                    316:                /* NOTREACHED */
1.1       kristaps  317:        }
                    318:
1.23      kristaps  319:        if ( ! mdoc_valid_pre(mdoc, p))
                    320:                return(0);
1.27      kristaps  321:
                    322:        switch (p->type) {
                    323:        case (MDOC_HEAD):
                    324:                assert(MDOC_BLOCK == p->parent->type);
1.53      kristaps  325:                p->parent->head = p;
1.27      kristaps  326:                break;
                    327:        case (MDOC_TAIL):
                    328:                assert(MDOC_BLOCK == p->parent->type);
1.53      kristaps  329:                p->parent->tail = p;
1.27      kristaps  330:                break;
                    331:        case (MDOC_BODY):
                    332:                assert(MDOC_BLOCK == p->parent->type);
1.53      kristaps  333:                p->parent->body = p;
1.27      kristaps  334:                break;
                    335:        default:
                    336:                break;
                    337:        }
                    338:
1.1       kristaps  339:        mdoc->last = p;
1.23      kristaps  340:        return(1);
1.1       kristaps  341: }
                    342:
                    343:
1.45      kristaps  344: static struct mdoc_node *
1.46      kristaps  345: mdoc_node_alloc(const struct mdoc *mdoc)
1.45      kristaps  346: {
1.46      kristaps  347:        struct mdoc_node *p;
                    348:
                    349:        p = xcalloc(1, sizeof(struct mdoc_node));
                    350:        p->sec = mdoc->lastsec;
1.45      kristaps  351:
1.46      kristaps  352:        return(p);
1.45      kristaps  353: }
                    354:
                    355:
1.23      kristaps  356: int
1.22      kristaps  357: mdoc_tail_alloc(struct mdoc *mdoc, int line, int pos, int tok)
1.17      kristaps  358: {
                    359:        struct mdoc_node *p;
                    360:
                    361:        assert(mdoc->first);
                    362:        assert(mdoc->last);
                    363:
1.46      kristaps  364:        p = mdoc_node_alloc(mdoc);
1.17      kristaps  365:
1.22      kristaps  366:        p->line = line;
                    367:        p->pos = pos;
1.17      kristaps  368:        p->type = MDOC_TAIL;
1.27      kristaps  369:        p->tok = tok;
1.17      kristaps  370:
1.23      kristaps  371:        return(mdoc_node_append(mdoc, p));
1.17      kristaps  372: }
                    373:
                    374:
1.23      kristaps  375: int
1.22      kristaps  376: mdoc_head_alloc(struct mdoc *mdoc, int line, int pos, int tok)
1.1       kristaps  377: {
                    378:        struct mdoc_node *p;
                    379:
                    380:        assert(mdoc->first);
                    381:        assert(mdoc->last);
                    382:
1.46      kristaps  383:        p = mdoc_node_alloc(mdoc);
1.13      kristaps  384:
1.22      kristaps  385:        p->line = line;
                    386:        p->pos = pos;
1.1       kristaps  387:        p->type = MDOC_HEAD;
1.27      kristaps  388:        p->tok = tok;
1.1       kristaps  389:
1.23      kristaps  390:        return(mdoc_node_append(mdoc, p));
1.1       kristaps  391: }
                    392:
                    393:
1.23      kristaps  394: int
1.22      kristaps  395: mdoc_body_alloc(struct mdoc *mdoc, int line, int pos, int tok)
1.1       kristaps  396: {
                    397:        struct mdoc_node *p;
                    398:
                    399:        assert(mdoc->first);
                    400:        assert(mdoc->last);
                    401:
1.46      kristaps  402:        p = mdoc_node_alloc(mdoc);
1.1       kristaps  403:
1.22      kristaps  404:        p->line = line;
                    405:        p->pos = pos;
1.1       kristaps  406:        p->type = MDOC_BODY;
1.27      kristaps  407:        p->tok = tok;
1.1       kristaps  408:
1.23      kristaps  409:        return(mdoc_node_append(mdoc, p));
1.1       kristaps  410: }
                    411:
                    412:
1.23      kristaps  413: int
1.25      kristaps  414: mdoc_root_alloc(struct mdoc *mdoc)
                    415: {
                    416:        struct mdoc_node *p;
                    417:
1.46      kristaps  418:        p = mdoc_node_alloc(mdoc);
1.25      kristaps  419:
                    420:        p->type = MDOC_ROOT;
                    421:
                    422:        return(mdoc_node_append(mdoc, p));
                    423: }
                    424:
                    425:
                    426: int
1.22      kristaps  427: mdoc_block_alloc(struct mdoc *mdoc, int line, int pos,
1.53      kristaps  428:                int tok, struct mdoc_arg *args)
1.1       kristaps  429: {
                    430:        struct mdoc_node *p;
                    431:
1.46      kristaps  432:        p = mdoc_node_alloc(mdoc);
1.1       kristaps  433:
1.22      kristaps  434:        p->pos = pos;
                    435:        p->line = line;
1.1       kristaps  436:        p->type = MDOC_BLOCK;
1.27      kristaps  437:        p->tok = tok;
1.53      kristaps  438:        p->args = args;
                    439:
                    440:        if (args)
                    441:                (args->refcnt)++;
1.1       kristaps  442:
1.23      kristaps  443:        return(mdoc_node_append(mdoc, p));
1.1       kristaps  444: }
                    445:
                    446:
1.23      kristaps  447: int
1.22      kristaps  448: mdoc_elem_alloc(struct mdoc *mdoc, int line, int pos,
1.53      kristaps  449:                int tok, struct mdoc_arg *args)
1.1       kristaps  450: {
                    451:        struct mdoc_node *p;
                    452:
1.46      kristaps  453:        p = mdoc_node_alloc(mdoc);
1.22      kristaps  454:
                    455:        p->line = line;
                    456:        p->pos = pos;
1.1       kristaps  457:        p->type = MDOC_ELEM;
1.27      kristaps  458:        p->tok = tok;
1.53      kristaps  459:        p->args = args;
                    460:
                    461:        if (args)
                    462:                (args->refcnt)++;
1.1       kristaps  463:
1.23      kristaps  464:        return(mdoc_node_append(mdoc, p));
1.1       kristaps  465: }
                    466:
                    467:
1.23      kristaps  468: int
1.22      kristaps  469: mdoc_word_alloc(struct mdoc *mdoc,
                    470:                int line, int pos, const char *word)
1.1       kristaps  471: {
                    472:        struct mdoc_node *p;
                    473:
1.46      kristaps  474:        p = mdoc_node_alloc(mdoc);
1.45      kristaps  475:
1.22      kristaps  476:        p->line = line;
                    477:        p->pos = pos;
1.1       kristaps  478:        p->type = MDOC_TEXT;
1.53      kristaps  479:        p->string = xstrdup(word);
1.1       kristaps  480:
1.23      kristaps  481:        return(mdoc_node_append(mdoc, p));
1.1       kristaps  482: }
                    483:
                    484:
1.53      kristaps  485: void
                    486: mdoc_node_free(struct mdoc_node *p)
1.1       kristaps  487: {
                    488:
1.53      kristaps  489:        if (p->string)
                    490:                free(p->string);
                    491:        if (p->args)
                    492:                mdoc_argv_free(p->args);
1.1       kristaps  493:        free(p);
                    494: }
                    495:
                    496:
1.53      kristaps  497: void
                    498: mdoc_node_freelist(struct mdoc_node *p)
1.1       kristaps  499: {
                    500:
1.53      kristaps  501:        if (p->child)
                    502:                mdoc_node_freelist(p->child);
                    503:        if (p->next)
                    504:                mdoc_node_freelist(p->next);
1.1       kristaps  505:
1.53      kristaps  506:        mdoc_node_free(p);
1.1       kristaps  507: }
                    508:
                    509:
1.53      kristaps  510: /*
                    511:  * Parse free-form text, that is, a line that does not begin with the
                    512:  * control character.
                    513:  */
                    514: static int
                    515: parsetext(struct mdoc *mdoc, int line, char *buf)
1.1       kristaps  516: {
                    517:
1.53      kristaps  518:        if (SEC_PROLOGUE == mdoc->lastnamed)
                    519:                return(mdoc_perr(mdoc, line, 0,
                    520:                        "text disallowed in prologue"));
1.1       kristaps  521:
1.53      kristaps  522:        if ( ! mdoc_word_alloc(mdoc, line, 0, buf))
                    523:                return(0);
1.1       kristaps  524:
1.53      kristaps  525:        mdoc->next = MDOC_NEXT_SIBLING;
                    526:        return(1);
1.1       kristaps  527: }
                    528:
                    529:
1.58      kristaps  530: static int
                    531: macrowarn(struct mdoc *m, int ln, const char *buf)
                    532: {
                    533:        if ( ! (MDOC_IGN_MACRO & m->pflags))
                    534:                return(mdoc_perr(m, ln, 1, "unknown macro: %s%s",
1.59      kristaps  535:                                buf, strlen(buf) > 3 ? "..." : ""));
1.58      kristaps  536:        return(mdoc_pwarn(m, ln, 1, WARN_SYNTAX,
                    537:                                "unknown macro: %s%s",
1.59      kristaps  538:                                buf, strlen(buf) > 3 ? "..." : ""));
1.58      kristaps  539: }
                    540:
                    541:
                    542:
1.53      kristaps  543: /*
                    544:  * Parse a macro line, that is, a line beginning with the control
                    545:  * character.
                    546:  */
                    547: int
                    548: parsemacro(struct mdoc *m, int ln, char *buf)
1.1       kristaps  549: {
1.53      kristaps  550:        int               i, c;
                    551:        char              mac[5];
1.1       kristaps  552:
1.63      kristaps  553:        /* Comments and empties are quickly ignored. */
                    554:
                    555:        if (0 == buf[1])
                    556:                return(1);
                    557:
1.65      kristaps  558:        if (' ' == buf[1]) {
1.63      kristaps  559:                i = 2;
1.65      kristaps  560:                while (buf[i] && ' ' == buf[i])
1.63      kristaps  561:                        i++;
                    562:                if (0 == buf[i])
                    563:                        return(1);
                    564:                return(mdoc_perr(m, ln, 1, "invalid syntax"));
                    565:        }
1.1       kristaps  566:
1.53      kristaps  567:        if (buf[1] && '\\' == buf[1])
                    568:                if (buf[2] && '\"' == buf[2])
                    569:                        return(1);
1.1       kristaps  570:
1.53      kristaps  571:        /* Copy the first word into a nil-terminated buffer. */
1.1       kristaps  572:
1.53      kristaps  573:        for (i = 1; i < 5; i++) {
                    574:                if (0 == (mac[i - 1] = buf[i]))
                    575:                        break;
1.65      kristaps  576:                else if (' ' == buf[i])
1.53      kristaps  577:                        break;
                    578:        }
1.1       kristaps  579:
1.53      kristaps  580:        mac[i - 1] = 0;
1.1       kristaps  581:
1.53      kristaps  582:        if (i == 5 || i <= 2) {
1.58      kristaps  583:                if ( ! macrowarn(m, ln, mac))
                    584:                        goto err;
                    585:                return(1);
1.53      kristaps  586:        }
                    587:
                    588:        if (MDOC_MAX == (c = mdoc_tokhash_find(m->htab, mac))) {
1.58      kristaps  589:                if ( ! macrowarn(m, ln, mac))
                    590:                        goto err;
                    591:                return(1);
1.53      kristaps  592:        }
1.1       kristaps  593:
1.53      kristaps  594:        /* The macro is sane.  Jump to the next word. */
1.1       kristaps  595:
1.65      kristaps  596:        while (buf[i] && ' ' == buf[i])
1.53      kristaps  597:                i++;
1.1       kristaps  598:
1.53      kristaps  599:        /* Begin recursive parse sequence. */
1.1       kristaps  600:
1.53      kristaps  601:        if ( ! mdoc_macro(m, c, ln, 1, &i, buf))
                    602:                goto err;
1.1       kristaps  603:
1.53      kristaps  604:        return(1);
1.1       kristaps  605:
1.53      kristaps  606: err:   /* Error out. */
1.1       kristaps  607:
1.53      kristaps  608:        m->flags |= MDOC_HALT;
                    609:        return(0);
1.1       kristaps  610: }

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