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Annotation of mandoc/man_macro.c, Revision 1.137

1.137   ! schwarze    1: /*     $Id: man_macro.c,v 1.136 2018/12/14 06:33:14 schwarze Exp $ */
1.1       kristaps    2: /*
1.65      schwarze    3:  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.124     schwarze    4:  * Copyright (c) 2012-2015, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
1.79      schwarze    5:  * Copyright (c) 2013 Franco Fichtner <franco@lastsummer.de>
1.1       kristaps    6:  *
                      7:  * Permission to use, copy, modify, and distribute this software for any
1.14      kristaps    8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps   10:  *
1.101     schwarze   11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
1.14      kristaps   12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.101     schwarze   13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
1.14      kristaps   14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   18:  */
1.30      kristaps   19: #include "config.h"
1.88      schwarze   20:
                     21: #include <sys/types.h>
1.30      kristaps   22:
1.1       kristaps   23: #include <assert.h>
                     24: #include <ctype.h>
1.134     schwarze   25: #include <stdio.h>
1.1       kristaps   26: #include <stdlib.h>
                     27: #include <string.h>
                     28:
1.101     schwarze   29: #include "mandoc.h"
                     30: #include "roff.h"
1.58      kristaps   31: #include "man.h"
1.57      kristaps   32: #include "libmandoc.h"
1.106     schwarze   33: #include "roff_int.h"
1.1       kristaps   34: #include "libman.h"
                     35:
1.91      schwarze   36: static void             blk_close(MACRO_PROT_ARGS);
                     37: static void             blk_exp(MACRO_PROT_ARGS);
                     38: static void             blk_imp(MACRO_PROT_ARGS);
                     39: static void             in_line_eoln(MACRO_PROT_ARGS);
1.105     schwarze   40: static int              man_args(struct roff_man *, int,
1.60      kristaps   41:                                int *, char *, char **);
1.116     schwarze   42: static void             rew_scope(struct roff_man *, enum roff_tok);
1.19      kristaps   43:
1.127     schwarze   44: static const struct man_macro man_macros[MAN_MAX - MAN_TH] = {
1.133     schwarze   45:        { in_line_eoln, MAN_XSCOPE }, /* TH */
                     46:        { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* SH */
                     47:        { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* SS */
                     48:        { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* TP */
                     49:        { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* TQ */
                     50:        { blk_imp, MAN_XSCOPE }, /* LP */
                     51:        { blk_imp, MAN_XSCOPE }, /* PP */
                     52:        { blk_imp, MAN_XSCOPE }, /* P */
                     53:        { blk_imp, MAN_XSCOPE }, /* IP */
                     54:        { blk_imp, MAN_XSCOPE }, /* HP */
                     55:        { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* SM */
                     56:        { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* SB */
1.19      kristaps   57:        { in_line_eoln, 0 }, /* BI */
                     58:        { in_line_eoln, 0 }, /* IB */
                     59:        { in_line_eoln, 0 }, /* BR */
                     60:        { in_line_eoln, 0 }, /* RB */
1.133     schwarze   61:        { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* R */
                     62:        { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* B */
                     63:        { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* I */
1.19      kristaps   64:        { in_line_eoln, 0 }, /* IR */
                     65:        { in_line_eoln, 0 }, /* RI */
1.110     schwarze   66:        { in_line_eoln, MAN_NSCOPED }, /* nf */
                     67:        { in_line_eoln, MAN_NSCOPED }, /* fi */
1.133     schwarze   68:        { blk_close, MAN_XSCOPE }, /* RE */
                     69:        { blk_exp, MAN_XSCOPE }, /* RS */
1.23      kristaps   70:        { in_line_eoln, 0 }, /* DT */
1.28      kristaps   71:        { in_line_eoln, 0 }, /* UC */
1.100     schwarze   72:        { in_line_eoln, MAN_NSCOPED }, /* PD */
1.45      joerg      73:        { in_line_eoln, 0 }, /* AT */
1.122     schwarze   74:        { in_line_eoln, MAN_NSCOPED }, /* in */
1.133     schwarze   75:        { blk_imp, MAN_XSCOPE }, /* SY */
                     76:        { blk_close, MAN_XSCOPE }, /* YS */
1.71      kristaps   77:        { in_line_eoln, 0 }, /* OP */
1.133     schwarze   78:        { in_line_eoln, MAN_XSCOPE }, /* EX */
                     79:        { in_line_eoln, MAN_XSCOPE }, /* EE */
                     80:        { blk_exp, MAN_XSCOPE }, /* UR */
                     81:        { blk_close, MAN_XSCOPE }, /* UE */
                     82:        { blk_exp, MAN_XSCOPE }, /* MT */
                     83:        { blk_close, MAN_XSCOPE }, /* ME */
1.19      kristaps   84: };
1.1       kristaps   85:
                     86:
1.127     schwarze   87: const struct man_macro *
                     88: man_macro(enum roff_tok tok)
                     89: {
                     90:        assert(tok >= MAN_TH && tok <= MAN_MAX);
                     91:        return man_macros + (tok - MAN_TH);
                     92: }
                     93:
1.91      schwarze   94: void
1.105     schwarze   95: man_unscope(struct roff_man *man, const struct roff_node *to)
1.1       kristaps   96: {
1.102     schwarze   97:        struct roff_node *n;
1.1       kristaps   98:
1.83      schwarze   99:        to = to->parent;
                    100:        n = man->last;
                    101:        while (n != to) {
1.87      schwarze  102:
                    103:                /* Reached the end of the document? */
                    104:
1.115     schwarze  105:                if (to == NULL && ! (n->flags & NODE_VALID)) {
1.87      schwarze  106:                        if (man->flags & (MAN_BLINE | MAN_ELINE) &&
1.133     schwarze  107:                            man_macro(n->tok)->flags &
                    108:                             (MAN_BSCOPED | MAN_NSCOPED)) {
1.135     schwarze  109:                                mandoc_msg(MANDOCERR_BLK_LINE,
                    110:                                    n->line, n->pos,
1.116     schwarze  111:                                    "EOF breaks %s", roff_name[n->tok]);
1.87      schwarze  112:                                if (man->flags & MAN_ELINE)
                    113:                                        man->flags &= ~MAN_ELINE;
                    114:                                else {
1.101     schwarze  115:                                        assert(n->type == ROFFT_HEAD);
1.87      schwarze  116:                                        n = n->parent;
                    117:                                        man->flags &= ~MAN_BLINE;
                    118:                                }
                    119:                                man->last = n;
                    120:                                n = n->parent;
1.106     schwarze  121:                                roff_node_delete(man, man->last);
1.87      schwarze  122:                                continue;
                    123:                        }
1.101     schwarze  124:                        if (n->type == ROFFT_BLOCK &&
1.127     schwarze  125:                            man_macro(n->tok)->fp == blk_exp)
1.87      schwarze  126:                                mandoc_msg(MANDOCERR_BLK_NOEND,
1.135     schwarze  127:                                    n->line, n->pos, "%s",
1.116     schwarze  128:                                    roff_name[n->tok]);
1.87      schwarze  129:                }
                    130:
1.55      kristaps  131:                /*
1.83      schwarze  132:                 * We might delete the man->last node
                    133:                 * in the post-validation phase.
                    134:                 * Save a pointer to the parent such that
                    135:                 * we know where to continue the iteration.
1.55      kristaps  136:                 */
1.89      schwarze  137:
1.83      schwarze  138:                man->last = n;
                    139:                n = n->parent;
1.115     schwarze  140:                man->last->flags |= NODE_VALID;
1.19      kristaps  141:        }
1.89      schwarze  142:
                    143:        /*
                    144:         * If we ended up at the parent of the node we were
                    145:         * supposed to rewind to, that means the target node
                    146:         * got deleted, so add the next node we parse as a child
                    147:         * of the parent instead of as a sibling of the target.
                    148:         */
                    149:
                    150:        man->next = (man->last == to) ?
1.105     schwarze  151:            ROFF_NEXT_CHILD : ROFF_NEXT_SIBLING;
1.19      kristaps  152: }
1.1       kristaps  153:
1.19      kristaps  154: /*
                    155:  * Rewinding entails ascending the parse tree until a coherent point,
                    156:  * for example, the `SH' macro will close out any intervening `SS'
                    157:  * scopes.  When a scope is closed, it must be validated and actioned.
                    158:  */
1.91      schwarze  159: static void
1.116     schwarze  160: rew_scope(struct roff_man *man, enum roff_tok tok)
1.19      kristaps  161: {
1.102     schwarze  162:        struct roff_node *n;
1.7       kristaps  163:
1.104     schwarze  164:        /* Preserve empty paragraphs before RS. */
                    165:
                    166:        n = man->last;
1.114     schwarze  167:        if (tok == MAN_RS && n->child == NULL &&
1.104     schwarze  168:            (n->tok == MAN_P || n->tok == MAN_PP || n->tok == MAN_LP))
                    169:                return;
                    170:
                    171:        for (;;) {
                    172:                if (n->type == ROFFT_ROOT)
                    173:                        return;
1.115     schwarze  174:                if (n->flags & NODE_VALID) {
1.104     schwarze  175:                        n = n->parent;
                    176:                        continue;
                    177:                }
                    178:                if (n->type != ROFFT_BLOCK) {
                    179:                        if (n->parent->type == ROFFT_ROOT) {
                    180:                                man_unscope(man, n);
                    181:                                return;
                    182:                        } else {
                    183:                                n = n->parent;
                    184:                                continue;
                    185:                        }
                    186:                }
                    187:                if (tok != MAN_SH && (n->tok == MAN_SH ||
                    188:                    (tok != MAN_SS && (n->tok == MAN_SS ||
1.127     schwarze  189:                     man_macro(n->tok)->fp == blk_exp))))
1.91      schwarze  190:                        return;
1.104     schwarze  191:                man_unscope(man, n);
                    192:                n = man->last;
1.6       kristaps  193:        }
1.19      kristaps  194: }
                    195:
1.6       kristaps  196:
1.36      kristaps  197: /*
                    198:  * Close out a generic explicit macro.
                    199:  */
1.91      schwarze  200: void
1.21      kristaps  201: blk_close(MACRO_PROT_ARGS)
                    202: {
1.124     schwarze  203:        enum roff_tok            ctok, ntok;
1.102     schwarze  204:        const struct roff_node  *nn;
1.137   ! schwarze  205:        char                    *p, *ep;
        !           206:        int                      cline, cpos, la, nrew, target;
1.21      kristaps  207:
1.93      schwarze  208:        nrew = 1;
1.21      kristaps  209:        switch (tok) {
1.82      schwarze  210:        case MAN_RE:
1.21      kristaps  211:                ntok = MAN_RS;
1.137   ! schwarze  212:                la = *pos;
1.93      schwarze  213:                if ( ! man_args(man, line, pos, buf, &p))
                    214:                        break;
                    215:                for (nn = man->last->parent; nn; nn = nn->parent)
1.101     schwarze  216:                        if (nn->tok == ntok && nn->type == ROFFT_BLOCK)
1.93      schwarze  217:                                nrew++;
1.137   ! schwarze  218:                target = strtol(p, &ep, 10);
        !           219:                if (*ep != '\0')
1.135     schwarze  220:                        mandoc_msg(MANDOCERR_ARG_EXCESS, line,
1.137   ! schwarze  221:                            la + (buf[la] == '"') + (int)(ep - p),
        !           222:                            "RE ... %s", ep);
        !           223:                free(p);
1.93      schwarze  224:                if (target == 0)
                    225:                        target = 1;
                    226:                nrew -= target;
                    227:                if (nrew < 1) {
1.135     schwarze  228:                        mandoc_msg(MANDOCERR_RE_NOTOPEN,
1.93      schwarze  229:                            line, ppos, "RE %d", target);
                    230:                        return;
                    231:                }
1.128     schwarze  232:                break;
                    233:        case MAN_YS:
                    234:                ntok = MAN_SY;
1.76      schwarze  235:                break;
1.82      schwarze  236:        case MAN_UE:
1.76      schwarze  237:                ntok = MAN_UR;
1.123     schwarze  238:                break;
                    239:        case MAN_ME:
                    240:                ntok = MAN_MT;
1.21      kristaps  241:                break;
                    242:        default:
                    243:                abort();
                    244:        }
                    245:
1.75      schwarze  246:        for (nn = man->last->parent; nn; nn = nn->parent)
1.101     schwarze  247:                if (nn->tok == ntok && nn->type == ROFFT_BLOCK && ! --nrew)
1.21      kristaps  248:                        break;
                    249:
1.91      schwarze  250:        if (nn == NULL) {
1.135     schwarze  251:                mandoc_msg(MANDOCERR_BLK_NOTOPEN,
                    252:                    line, ppos, "%s", roff_name[tok]);
1.104     schwarze  253:                rew_scope(man, MAN_PP);
1.131     schwarze  254:                if (tok == MAN_RE) {
                    255:                        roff_elem_alloc(man, line, ppos, ROFF_br);
                    256:                        man->last->flags |= NODE_LINE |
                    257:                            NODE_VALID | NODE_ENDED;
                    258:                        man->next = ROFF_NEXT_SIBLING;
                    259:                }
1.124     schwarze  260:                return;
                    261:        }
                    262:
                    263:        cline = man->last->line;
                    264:        cpos = man->last->pos;
                    265:        ctok = man->last->tok;
                    266:        man_unscope(man, nn);
                    267:
                    268:        if (tok == MAN_RE && nn->head->aux > 0)
                    269:                roff_setreg(man->roff, "an-margin", nn->head->aux, '-');
                    270:
                    271:        /* Trailing text. */
                    272:
                    273:        if (buf[*pos] != '\0') {
                    274:                roff_word_alloc(man, line, ppos, buf + *pos);
                    275:                man->last->flags |= NODE_DELIMC;
1.130     schwarze  276:                if (mandoc_eos(man->last->string, strlen(man->last->string)))
                    277:                        man->last->flags |= NODE_EOS;
1.124     schwarze  278:        }
                    279:
                    280:        /* Move a trailing paragraph behind the block. */
                    281:
                    282:        if (ctok == MAN_LP || ctok == MAN_PP || ctok == MAN_P) {
                    283:                *pos = strlen(buf);
1.125     schwarze  284:                blk_imp(man, ctok, cline, cpos, pos, buf);
1.129     schwarze  285:        }
                    286:
                    287:        /* Synopsis blocks need an explicit end marker for spacing. */
                    288:
                    289:        if (tok == MAN_YS && man->last == nn) {
                    290:                roff_elem_alloc(man, line, ppos, tok);
                    291:                man_unscope(man, man->last);
1.95      schwarze  292:        }
1.21      kristaps  293: }
                    294:
1.91      schwarze  295: void
1.35      kristaps  296: blk_exp(MACRO_PROT_ARGS)
                    297: {
1.102     schwarze  298:        struct roff_node *head;
1.98      schwarze  299:        char            *p;
1.59      kristaps  300:        int              la;
1.35      kristaps  301:
1.132     schwarze  302:        if (tok == MAN_RS)
                    303:                rew_scope(man, tok);
1.108     schwarze  304:        roff_block_alloc(man, line, ppos, tok);
1.106     schwarze  305:        head = roff_head_alloc(man, line, ppos, tok);
1.35      kristaps  306:
1.98      schwarze  307:        la = *pos;
1.121     schwarze  308:        if (man_args(man, line, pos, buf, &p)) {
1.107     schwarze  309:                roff_word_alloc(man, line, la, p);
1.121     schwarze  310:                if (tok == MAN_RS) {
                    311:                        if (roff_getreg(man->roff, "an-margin") == 0)
                    312:                                roff_setreg(man->roff, "an-margin",
                    313:                                    7 * 24, '=');
                    314:                        if ((head->aux = strtod(p, NULL) * 24.0) > 0)
                    315:                                roff_setreg(man->roff, "an-margin",
                    316:                                    head->aux, '+');
                    317:                }
1.137   ! schwarze  318:                free(p);
1.121     schwarze  319:        }
1.35      kristaps  320:
1.98      schwarze  321:        if (buf[*pos] != '\0')
1.135     schwarze  322:                mandoc_msg(MANDOCERR_ARG_EXCESS, line, *pos,
                    323:                    "%s ... %s", roff_name[tok], buf + *pos);
1.73      schwarze  324:
1.98      schwarze  325:        man_unscope(man, head);
1.106     schwarze  326:        roff_body_alloc(man, line, ppos, tok);
1.35      kristaps  327: }
                    328:
1.19      kristaps  329: /*
1.101     schwarze  330:  * Parse an implicit-block macro.  These contain a ROFFT_HEAD and a
                    331:  * ROFFT_BODY contained within a ROFFT_BLOCK.  Rules for closing out other
1.19      kristaps  332:  * scopes, such as `SH' closing out an `SS', are defined in the rew
                    333:  * routines.
                    334:  */
1.91      schwarze  335: void
1.19      kristaps  336: blk_imp(MACRO_PROT_ARGS)
                    337: {
1.59      kristaps  338:        int              la;
1.19      kristaps  339:        char            *p;
1.102     schwarze  340:        struct roff_node *n;
1.19      kristaps  341:
1.104     schwarze  342:        rew_scope(man, tok);
1.108     schwarze  343:        n = roff_block_alloc(man, line, ppos, tok);
1.106     schwarze  344:        if (n->tok == MAN_SH || n->tok == MAN_SS)
                    345:                man->flags &= ~MAN_LITERAL;
                    346:        n = roff_head_alloc(man, line, ppos, tok);
1.25      kristaps  347:
1.19      kristaps  348:        /* Add line arguments. */
1.3       kristaps  349:
1.19      kristaps  350:        for (;;) {
                    351:                la = *pos;
1.75      schwarze  352:                if ( ! man_args(man, line, pos, buf, &p))
1.19      kristaps  353:                        break;
1.107     schwarze  354:                roff_word_alloc(man, line, la, p);
1.137   ! schwarze  355:                free(p);
1.6       kristaps  356:        }
                    357:
1.99      schwarze  358:        /*
                    359:         * For macros having optional next-line scope,
                    360:         * keep the head open if there were no arguments.
1.133     schwarze  361:         * For `TP' and `TQ', always keep the head open.
1.99      schwarze  362:         */
1.19      kristaps  363:
1.133     schwarze  364:        if (man_macro(tok)->flags & MAN_BSCOPED &&
1.126     schwarze  365:            (tok == MAN_TP || tok == MAN_TQ || n == man->last)) {
1.99      schwarze  366:                man->flags |= MAN_BLINE;
                    367:                return;
1.27      kristaps  368:        }
1.99      schwarze  369:
                    370:        /* Close out the head and open the body. */
                    371:
1.103     schwarze  372:        man_unscope(man, n);
1.106     schwarze  373:        roff_body_alloc(man, line, ppos, tok);
1.4       kristaps  374: }
                    375:
1.91      schwarze  376: void
1.19      kristaps  377: in_line_eoln(MACRO_PROT_ARGS)
1.3       kristaps  378: {
1.59      kristaps  379:        int              la;
1.19      kristaps  380:        char            *p;
1.102     schwarze  381:        struct roff_node *n;
1.3       kristaps  382:
1.108     schwarze  383:        roff_elem_alloc(man, line, ppos, tok);
1.75      schwarze  384:        n = man->last;
1.3       kristaps  385:
1.19      kristaps  386:        for (;;) {
1.117     schwarze  387:                if (buf[*pos] != '\0' && (tok == MAN_fi || tok == MAN_nf)) {
1.135     schwarze  388:                        mandoc_msg(MANDOCERR_ARG_SKIP, line, *pos,
                    389:                            "%s %s", roff_name[tok], buf + *pos);
1.97      schwarze  390:                        break;
                    391:                }
1.120     schwarze  392:                if (buf[*pos] != '\0' && man->last != n && tok == MAN_PD) {
1.135     schwarze  393:                        mandoc_msg(MANDOCERR_ARG_EXCESS, line, *pos,
                    394:                            "%s ... %s", roff_name[tok], buf + *pos);
1.96      schwarze  395:                        break;
                    396:                }
1.19      kristaps  397:                la = *pos;
1.75      schwarze  398:                if ( ! man_args(man, line, pos, buf, &p))
1.19      kristaps  399:                        break;
1.127     schwarze  400:                if (man_macro(tok)->flags & MAN_JOIN &&
1.101     schwarze  401:                    man->last->type == ROFFT_TEXT)
1.107     schwarze  402:                        roff_word_append(man, p);
1.91      schwarze  403:                else
1.107     schwarze  404:                        roff_word_alloc(man, line, la, p);
1.137   ! schwarze  405:                free(p);
1.19      kristaps  406:        }
1.78      schwarze  407:
                    408:        /*
1.115     schwarze  409:         * Append NODE_EOS in case the last snipped argument
1.78      schwarze  410:         * ends with a dot, e.g. `.IR syslog (3).'
                    411:         */
                    412:
                    413:        if (n != man->last &&
1.80      schwarze  414:            mandoc_eos(man->last->string, strlen(man->last->string)))
1.115     schwarze  415:                man->last->flags |= NODE_EOS;
1.3       kristaps  416:
1.31      kristaps  417:        /*
1.133     schwarze  418:         * If no arguments are specified and this is MAN_ESCOPED (i.e.,
1.31      kristaps  419:         * next-line scoped), then set our mode to indicate that we're
                    420:         * waiting for terms to load into our context.
                    421:         */
                    422:
1.133     schwarze  423:        if (n == man->last && man_macro(tok)->flags & MAN_ESCOPED) {
1.75      schwarze  424:                man->flags |= MAN_ELINE;
1.91      schwarze  425:                return;
1.31      kristaps  426:        }
1.64      kristaps  427:
1.101     schwarze  428:        assert(man->last->type != ROFFT_ROOT);
1.105     schwarze  429:        man->next = ROFF_NEXT_SIBLING;
1.82      schwarze  430:
1.113     schwarze  431:        /* Rewind our element scope. */
1.3       kristaps  432:
1.75      schwarze  433:        for ( ; man->last; man->last = man->last->parent) {
1.113     schwarze  434:                man_state(man, man->last);
1.75      schwarze  435:                if (man->last == n)
1.19      kristaps  436:                        break;
                    437:        }
1.133     schwarze  438:
                    439:        /* Rewind next-line scoped ancestors, if any. */
                    440:
                    441:        if (man_macro(tok)->flags & MAN_ESCOPED)
                    442:                man_descope(man, line, ppos, NULL);
1.19      kristaps  443: }
1.3       kristaps  444:
1.91      schwarze  445: void
1.109     schwarze  446: man_endparse(struct roff_man *man)
1.19      kristaps  447: {
1.22      kristaps  448:
1.91      schwarze  449:        man_unscope(man, man->first);
1.113     schwarze  450:        man->flags &= ~MAN_LITERAL;
1.19      kristaps  451: }
1.3       kristaps  452:
1.60      kristaps  453: static int
1.105     schwarze  454: man_args(struct roff_man *man, int line, int *pos, char *buf, char **v)
1.60      kristaps  455: {
                    456:        char     *start;
                    457:
                    458:        assert(*pos);
                    459:        *v = start = buf + *pos;
                    460:        assert(' ' != *start);
                    461:
                    462:        if ('\0' == *start)
1.112     schwarze  463:                return 0;
1.60      kristaps  464:
1.137   ! schwarze  465:        *v = roff_getarg(man->roff, v, line, pos);
1.112     schwarze  466:        return 1;
1.60      kristaps  467: }

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