Annotation of src/usr.bin/mandoc/man.c, Revision 1.22
1.22 ! schwarze 1: /* $Id: man.c,v 1.21 2010/03/25 23:23:01 schwarze Exp $ */
1.1 kristaps 2: /*
1.2 schwarze 3: * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.2 schwarze 6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 8: *
1.2 schwarze 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 kristaps 16: */
1.14 schwarze 17: #include <sys/types.h>
18:
1.1 kristaps 19: #include <assert.h>
20: #include <ctype.h>
21: #include <stdarg.h>
22: #include <stdlib.h>
23: #include <stdio.h>
24: #include <string.h>
25:
26: #include "libman.h"
1.16 schwarze 27: #include "libmandoc.h"
1.1 kristaps 28:
1.7 schwarze 29: const char *const __man_merrnames[WERRMAX] = {
30: "invalid character", /* WNPRINT */
31: "invalid manual section", /* WMSEC */
32: "invalid date format", /* WDATE */
33: "scope of prior line violated", /* WLNSCOPE */
1.21 schwarze 34: "over-zealous prior line scope violation", /* WLNSCOPE2 */
1.7 schwarze 35: "trailing whitespace", /* WTSPACE */
36: "unterminated quoted parameter", /* WTQUOTE */
37: "document has no body", /* WNODATA */
38: "document has no title/section", /* WNOTITLE */
39: "invalid escape sequence", /* WESCAPE */
1.8 schwarze 40: "invalid number format", /* WNUMFMT */
1.9 schwarze 41: "expected block head arguments", /* WHEADARGS */
42: "expected block body arguments", /* WBODYARGS */
43: "expected empty block head", /* WNHEADARGS */
44: "ill-formed macro", /* WMACROFORM */
1.10 schwarze 45: "scope open on exit", /* WEXITSCOPE */
46: "no scope context", /* WNOSCOPE */
47: "literal context already open", /* WOLITERAL */
1.22 ! schwarze 48: "no literal context open", /* WNLITERAL */
! 49: "invalid nesting of roff declarations", /* WROFFNEST */
1.7 schwarze 50: };
51:
1.1 kristaps 52: const char *const __man_macronames[MAN_MAX] = {
1.3 schwarze 53: "br", "TH", "SH", "SS",
1.1 kristaps 54: "TP", "LP", "PP", "P",
55: "IP", "HP", "SM", "SB",
56: "BI", "IB", "BR", "RB",
57: "R", "B", "I", "IR",
1.9 schwarze 58: "RI", "na", "i", "sp",
1.10 schwarze 59: "nf", "fi", "r", "RE",
1.20 schwarze 60: "RS", "DT", "UC", "PD",
1.22 ! schwarze 61: "Sp", "Vb", "Ve", "de",
! 62: "dei", "am", "ami", "ig",
! 63: ".",
1.1 kristaps 64: };
65:
66: const char * const *man_macronames = __man_macronames;
67:
68: static struct man_node *man_node_alloc(int, int,
1.22 ! schwarze 69: enum man_type, enum mant);
1.1 kristaps 70: static int man_node_append(struct man *,
71: struct man_node *);
1.22 ! schwarze 72: static void man_node_free(struct man_node *);
! 73: static void man_node_unlink(struct man *,
! 74: struct man_node *);
1.1 kristaps 75: static int man_ptext(struct man *, int, char *);
76: static int man_pmacro(struct man *, int, char *);
77: static void man_free1(struct man *);
1.16 schwarze 78: static void man_alloc1(struct man *);
1.10 schwarze 79: static int pstring(struct man *, int, int,
80: const char *, size_t);
1.15 schwarze 81: static int macrowarn(struct man *, int, const char *);
1.1 kristaps 82:
83:
84: const struct man_node *
85: man_node(const struct man *m)
86: {
87:
88: return(MAN_HALT & m->flags ? NULL : m->first);
89: }
90:
91:
92: const struct man_meta *
93: man_meta(const struct man *m)
94: {
95:
96: return(MAN_HALT & m->flags ? NULL : &m->meta);
97: }
98:
99:
1.16 schwarze 100: void
1.1 kristaps 101: man_reset(struct man *man)
102: {
103:
104: man_free1(man);
1.16 schwarze 105: man_alloc1(man);
1.1 kristaps 106: }
107:
108:
109: void
110: man_free(struct man *man)
111: {
112:
113: man_free1(man);
114: free(man);
115: }
116:
117:
118: struct man *
119: man_alloc(void *data, int pflags, const struct man_cb *cb)
120: {
121: struct man *p;
122:
1.16 schwarze 123: p = mandoc_calloc(1, sizeof(struct man));
1.1 kristaps 124:
1.16 schwarze 125: if (cb)
126: memcpy(&p->cb, cb, sizeof(struct man_cb));
1.1 kristaps 127:
1.13 schwarze 128: man_hash_init();
1.1 kristaps 129: p->data = data;
130: p->pflags = pflags;
1.16 schwarze 131:
132: man_alloc1(p);
1.1 kristaps 133: return(p);
134: }
135:
136:
137: int
138: man_endparse(struct man *m)
139: {
140:
141: if (MAN_HALT & m->flags)
142: return(0);
143: else if (man_macroend(m))
144: return(1);
145: m->flags |= MAN_HALT;
146: return(0);
147: }
148:
149:
150: int
151: man_parseln(struct man *m, int ln, char *buf)
152: {
153:
154: return('.' == *buf ?
155: man_pmacro(m, ln, buf) :
156: man_ptext(m, ln, buf));
157: }
158:
159:
160: static void
161: man_free1(struct man *man)
162: {
163:
164: if (man->first)
1.22 ! schwarze 165: man_node_delete(man, man->first);
1.1 kristaps 166: if (man->meta.title)
167: free(man->meta.title);
168: if (man->meta.source)
169: free(man->meta.source);
170: if (man->meta.vol)
171: free(man->meta.vol);
172: }
173:
174:
1.16 schwarze 175: static void
1.1 kristaps 176: man_alloc1(struct man *m)
177: {
178:
1.16 schwarze 179: memset(&m->meta, 0, sizeof(struct man_meta));
1.1 kristaps 180: m->flags = 0;
1.16 schwarze 181: m->last = mandoc_calloc(1, sizeof(struct man_node));
1.1 kristaps 182: m->first = m->last;
183: m->last->type = MAN_ROOT;
1.22 ! schwarze 184: m->last->tok = MAN_MAX;
1.1 kristaps 185: m->next = MAN_NEXT_CHILD;
186: }
187:
188:
189: static int
190: man_node_append(struct man *man, struct man_node *p)
191: {
192:
193: assert(man->last);
194: assert(man->first);
195: assert(MAN_ROOT != p->type);
196:
197: switch (man->next) {
198: case (MAN_NEXT_SIBLING):
199: man->last->next = p;
200: p->prev = man->last;
201: p->parent = man->last->parent;
202: break;
203: case (MAN_NEXT_CHILD):
204: man->last->child = p;
205: p->parent = man->last;
206: break;
207: default:
208: abort();
209: /* NOTREACHED */
210: }
1.5 schwarze 211:
1.22 ! schwarze 212: assert(p->parent);
1.5 schwarze 213: p->parent->nchild++;
1.1 kristaps 214:
1.9 schwarze 215: if ( ! man_valid_pre(man, p))
216: return(0);
217:
218: switch (p->type) {
219: case (MAN_HEAD):
220: assert(MAN_BLOCK == p->parent->type);
221: p->parent->head = p;
222: break;
223: case (MAN_BODY):
224: assert(MAN_BLOCK == p->parent->type);
225: p->parent->body = p;
226: break;
227: default:
228: break;
229: }
230:
1.1 kristaps 231: man->last = p;
232:
233: switch (p->type) {
234: case (MAN_TEXT):
235: if ( ! man_valid_post(man))
236: return(0);
237: if ( ! man_action_post(man))
238: return(0);
239: break;
240: default:
241: break;
242: }
243:
244: return(1);
245: }
246:
247:
248: static struct man_node *
1.22 ! schwarze 249: man_node_alloc(int line, int pos, enum man_type type, enum mant tok)
1.1 kristaps 250: {
251: struct man_node *p;
252:
1.16 schwarze 253: p = mandoc_calloc(1, sizeof(struct man_node));
1.1 kristaps 254: p->line = line;
255: p->pos = pos;
256: p->type = type;
257: p->tok = tok;
258: return(p);
259: }
260:
261:
262: int
1.22 ! schwarze 263: man_elem_alloc(struct man *m, int line, int pos, enum mant tok)
1.1 kristaps 264: {
265: struct man_node *p;
266:
267: p = man_node_alloc(line, pos, MAN_ELEM, tok);
1.10 schwarze 268: if ( ! man_node_append(m, p))
269: return(0);
270: m->next = MAN_NEXT_CHILD;
271: return(1);
1.1 kristaps 272: }
273:
274:
275: int
1.22 ! schwarze 276: man_head_alloc(struct man *m, int line, int pos, enum mant tok)
1.9 schwarze 277: {
278: struct man_node *p;
279:
280: p = man_node_alloc(line, pos, MAN_HEAD, tok);
281: if ( ! man_node_append(m, p))
282: return(0);
283: m->next = MAN_NEXT_CHILD;
284: return(1);
285: }
286:
287:
288: int
1.22 ! schwarze 289: man_body_alloc(struct man *m, int line, int pos, enum mant tok)
1.9 schwarze 290: {
291: struct man_node *p;
292:
293: p = man_node_alloc(line, pos, MAN_BODY, tok);
294: if ( ! man_node_append(m, p))
295: return(0);
296: m->next = MAN_NEXT_CHILD;
297: return(1);
298: }
299:
300:
301: int
1.22 ! schwarze 302: man_block_alloc(struct man *m, int line, int pos, enum mant tok)
1.9 schwarze 303: {
304: struct man_node *p;
305:
306: p = man_node_alloc(line, pos, MAN_BLOCK, tok);
307: if ( ! man_node_append(m, p))
308: return(0);
309: m->next = MAN_NEXT_CHILD;
310: return(1);
311: }
312:
313:
1.10 schwarze 314: static int
315: pstring(struct man *m, int line, int pos,
316: const char *p, size_t len)
1.1 kristaps 317: {
1.10 schwarze 318: struct man_node *n;
319: size_t sv;
1.1 kristaps 320:
1.22 ! schwarze 321: n = man_node_alloc(line, pos, MAN_TEXT, MAN_MAX);
1.16 schwarze 322: n->string = mandoc_malloc(len + 1);
1.10 schwarze 323: sv = strlcpy(n->string, p, len + 1);
324:
325: /* Prohibit truncation. */
326: assert(sv < len + 1);
327:
328: if ( ! man_node_append(m, n))
1.1 kristaps 329: return(0);
1.10 schwarze 330: m->next = MAN_NEXT_SIBLING;
331: return(1);
332: }
333:
334:
335: int
336: man_word_alloc(struct man *m, int line, int pos, const char *word)
337: {
338:
339: return(pstring(m, line, pos, word, strlen(word)));
1.1 kristaps 340: }
341:
342:
1.22 ! schwarze 343: /*
! 344: * Free all of the resources held by a node. This does NOT unlink a
! 345: * node from its context; for that, see man_node_unlink().
! 346: */
! 347: static void
1.1 kristaps 348: man_node_free(struct man_node *p)
349: {
350:
351: if (p->string)
352: free(p->string);
353: free(p);
354: }
355:
356:
357: void
1.22 ! schwarze 358: man_node_delete(struct man *m, struct man_node *p)
1.1 kristaps 359: {
360:
1.22 ! schwarze 361: while (p->child)
! 362: man_node_delete(m, p->child);
! 363:
! 364: man_node_unlink(m, p);
1.1 kristaps 365: man_node_free(p);
366: }
367:
368:
369: static int
370: man_ptext(struct man *m, int line, char *buf)
371: {
1.10 schwarze 372: int i, j;
1.18 schwarze 373: char sv;
1.10 schwarze 374:
375: /* Literal free-form text whitespace is preserved. */
376:
377: if (MAN_LITERAL & m->flags) {
378: if ( ! man_word_alloc(m, line, 0, buf))
379: return(0);
380: goto descope;
381: }
382:
383: /* First de-chunk and allocate words. */
384:
385: for (i = 0; ' ' == buf[i]; i++)
386: /* Skip leading whitespace. */ ;
1.18 schwarze 387:
388: if ('\0' == buf[i]) {
389: /* Trailing whitespace? */
390: if (i && ' ' == buf[i - 1])
391: if ( ! man_pwarn(m, line, i - 1, WTSPACE))
392: return(0);
1.10 schwarze 393: if ( ! pstring(m, line, 0, &buf[i], 0))
394: return(0);
395: goto descope;
396: }
1.1 kristaps 397:
1.10 schwarze 398: for (j = i; buf[i]; i++) {
399: if (' ' != buf[i])
400: continue;
401:
402: /* Escaped whitespace. */
403: if (i && ' ' == buf[i] && '\\' == buf[i - 1])
404: continue;
405:
1.18 schwarze 406: sv = buf[i];
407: buf[i++] = '\0';
408:
1.10 schwarze 409: if ( ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
410: return(0);
411:
1.18 schwarze 412: /* Trailing whitespace? Check at overwritten byte. */
413:
414: if (' ' == sv && '\0' == buf[i])
415: if ( ! man_pwarn(m, line, i - 1, WTSPACE))
416: return(0);
417:
1.10 schwarze 418: for ( ; ' ' == buf[i]; i++)
419: /* Skip trailing whitespace. */ ;
420:
421: j = i;
1.18 schwarze 422:
423: /* Trailing whitespace? */
424:
425: if (' ' == buf[i - 1] && '\0' == buf[i])
426: if ( ! man_pwarn(m, line, i - 1, WTSPACE))
427: return(0);
428:
429: if ('\0' == buf[i])
1.10 schwarze 430: break;
431: }
1.9 schwarze 432:
1.10 schwarze 433: if (j != i && ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
1.1 kristaps 434: return(0);
1.10 schwarze 435:
436: descope:
1.1 kristaps 437:
438: /*
1.9 schwarze 439: * Co-ordinate what happens with having a next-line scope open:
440: * first close out the element scope (if applicable), then close
441: * out the block scope (also if applicable).
1.1 kristaps 442: */
443:
1.9 schwarze 444: if (MAN_ELINE & m->flags) {
445: m->flags &= ~MAN_ELINE;
446: if ( ! man_unscope(m, m->last->parent))
447: return(0);
448: }
449:
450: if ( ! (MAN_BLINE & m->flags))
1.1 kristaps 451: return(1);
1.9 schwarze 452: m->flags &= ~MAN_BLINE;
1.1 kristaps 453:
1.9 schwarze 454: if ( ! man_unscope(m, m->last->parent))
1.1 kristaps 455: return(0);
1.9 schwarze 456: return(man_body_alloc(m, line, 0, m->last->tok));
1.1 kristaps 457: }
458:
459:
1.15 schwarze 460: static int
461: macrowarn(struct man *m, int ln, const char *buf)
462: {
463: if ( ! (MAN_IGN_MACRO & m->pflags))
464: return(man_verr(m, ln, 0,
465: "unknown macro: %s%s",
466: buf, strlen(buf) > 3 ? "..." : ""));
467: return(man_vwarn(m, ln, 0, "unknown macro: %s%s",
468: buf, strlen(buf) > 3 ? "..." : ""));
469: }
470:
471:
1.1 kristaps 472: int
473: man_pmacro(struct man *m, int ln, char *buf)
474: {
1.22 ! schwarze 475: int i, j, ppos, fl;
! 476: enum mant tok;
1.10 schwarze 477: char mac[5];
478: struct man_node *n;
1.1 kristaps 479:
480: /* Comments and empties are quickly ignored. */
481:
1.9 schwarze 482: fl = m->flags;
1.1 kristaps 483:
1.17 schwarze 484: if ('\0' == buf[1])
485: return(1);
1.1 kristaps 486:
487: i = 1;
488:
489: if (' ' == buf[i]) {
490: i++;
491: while (buf[i] && ' ' == buf[i])
492: i++;
1.18 schwarze 493: if ('\0' == buf[i])
1.1 kristaps 494: goto out;
495: }
496:
497: ppos = i;
498:
499: /* Copy the first word into a nil-terminated buffer. */
500:
501: for (j = 0; j < 4; j++, i++) {
1.18 schwarze 502: if ('\0' == (mac[j] = buf[i]))
1.1 kristaps 503: break;
504: else if (' ' == buf[i])
505: break;
1.11 schwarze 506:
507: /* Check for invalid characters. */
508:
509: if (isgraph((u_char)buf[i]))
510: continue;
511: return(man_perr(m, ln, i, WNPRINT));
1.1 kristaps 512: }
513:
1.17 schwarze 514: mac[j] = '\0';
1.1 kristaps 515:
516: if (j == 4 || j < 1) {
517: if ( ! (MAN_IGN_MACRO & m->pflags)) {
1.9 schwarze 518: (void)man_perr(m, ln, ppos, WMACROFORM);
1.1 kristaps 519: goto err;
520: }
1.9 schwarze 521: if ( ! man_pwarn(m, ln, ppos, WMACROFORM))
1.1 kristaps 522: goto err;
523: return(1);
524: }
525:
1.22 ! schwarze 526: if (MAN_MAX == (tok = man_hash_find(mac))) {
1.15 schwarze 527: if ( ! macrowarn(m, ln, mac))
1.1 kristaps 528: goto err;
529: return(1);
530: }
531:
532: /* The macro is sane. Jump to the next word. */
533:
534: while (buf[i] && ' ' == buf[i])
535: i++;
1.18 schwarze 536:
537: /* Trailing whitespace? */
538:
539: if ('\0' == buf[i] && ' ' == buf[i - 1])
540: if ( ! man_pwarn(m, ln, i - 1, WTSPACE))
541: goto err;
1.1 kristaps 542:
1.21 schwarze 543: /*
544: * Remove prior ELINE macro, as it's being clobbering by a new
545: * macro. Note that NSCOPED macros do not close out ELINE
546: * macros---they don't print text---so we let those slip by.
547: */
548:
1.22 ! schwarze 549: if ( ! (MAN_NSCOPED & man_macros[tok].flags) &&
1.21 schwarze 550: m->flags & MAN_ELINE) {
551: assert(MAN_TEXT != m->last->type);
552:
553: /*
554: * This occurs in the following construction:
555: * .B
556: * .br
557: * .B
558: * .br
559: * I hate man macros.
560: * Flat-out disallow this madness.
561: */
562: if (MAN_NSCOPED & man_macros[m->last->tok].flags)
563: return(man_perr(m, ln, ppos, WLNSCOPE));
1.10 schwarze 564:
565: n = m->last;
1.21 schwarze 566:
567: assert(n);
1.10 schwarze 568: assert(NULL == n->child);
569: assert(0 == n->nchild);
1.21 schwarze 570:
1.10 schwarze 571: if ( ! man_nwarn(m, n, WLNSCOPE))
572: return(0);
573:
1.22 ! schwarze 574: man_node_delete(m, n);
1.10 schwarze 575: m->flags &= ~MAN_ELINE;
576: }
577:
1.1 kristaps 578: /* Begin recursive parse sequence. */
579:
1.22 ! schwarze 580: assert(man_macros[tok].fp);
1.9 schwarze 581:
1.22 ! schwarze 582: if ( ! (*man_macros[tok].fp)(m, tok, ln, ppos, &i, buf))
1.1 kristaps 583: goto err;
584:
585: out:
1.21 schwarze 586: /*
587: * We weren't in a block-line scope when entering the
588: * above-parsed macro, so return.
1.22 ! schwarze 589: *
! 590: * FIXME: this prohibits the nesting of blocks (e.g., `de' and
! 591: * family) within BLINE or ELINE systems. This is annoying.
1.21 schwarze 592: */
593:
594: if ( ! (MAN_BLINE & fl)) {
595: m->flags &= ~MAN_ILINE;
1.9 schwarze 596: return(1);
1.21 schwarze 597: }
598:
599: /*
600: * If we're in a block scope, then allow this macro to slip by
601: * without closing scope around it.
602: */
603:
604: if (MAN_ILINE & m->flags) {
605: m->flags &= ~MAN_ILINE;
606: return(1);
607: }
1.9 schwarze 608:
609: /*
610: * If we've opened a new next-line element scope, then return
611: * now, as the next line will close out the block scope.
612: */
613:
614: if (MAN_ELINE & m->flags)
615: return(1);
616:
617: /* Close out the block scope opened in the prior line. */
1.1 kristaps 618:
1.9 schwarze 619: assert(MAN_BLINE & m->flags);
620: m->flags &= ~MAN_BLINE;
1.1 kristaps 621:
1.9 schwarze 622: if ( ! man_unscope(m, m->last->parent))
623: return(0);
624: return(man_body_alloc(m, ln, 0, m->last->tok));
1.1 kristaps 625:
626: err: /* Error out. */
627:
628: m->flags |= MAN_HALT;
629: return(0);
630: }
631:
632:
633: int
634: man_verr(struct man *man, int ln, int pos, const char *fmt, ...)
635: {
636: char buf[256];
637: va_list ap;
638:
639: if (NULL == man->cb.man_err)
640: return(0);
641:
642: va_start(ap, fmt);
643: (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
644: va_end(ap);
645: return((*man->cb.man_err)(man->data, ln, pos, buf));
646: }
647:
648:
649: int
650: man_vwarn(struct man *man, int ln, int pos, const char *fmt, ...)
651: {
652: char buf[256];
653: va_list ap;
654:
655: if (NULL == man->cb.man_warn)
656: return(0);
657:
658: va_start(ap, fmt);
659: (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
660: va_end(ap);
661: return((*man->cb.man_warn)(man->data, ln, pos, buf));
662: }
663:
664:
1.4 schwarze 665: int
1.7 schwarze 666: man_err(struct man *m, int line, int pos, int iserr, enum merr type)
1.4 schwarze 667: {
668: const char *p;
669:
1.7 schwarze 670: p = __man_merrnames[(int)type];
1.4 schwarze 671: assert(p);
672:
673: if (iserr)
674: return(man_verr(m, line, pos, p));
675:
676: return(man_vwarn(m, line, pos, p));
1.21 schwarze 677: }
678:
679:
1.22 ! schwarze 680: /*
! 681: * Unlink a node from its context. If "m" is provided, the last parse
! 682: * point will also be adjusted accordingly.
! 683: */
! 684: static void
1.21 schwarze 685: man_node_unlink(struct man *m, struct man_node *n)
686: {
687:
1.22 ! schwarze 688: /* Adjust siblings. */
! 689:
! 690: if (n->prev)
1.21 schwarze 691: n->prev->next = n->next;
1.22 ! schwarze 692: if (n->next)
! 693: n->next->prev = n->prev;
! 694:
! 695: /* Adjust parent. */
! 696:
! 697: if (n->parent) {
! 698: n->parent->nchild--;
! 699: if (n->parent->child == n)
! 700: n->parent->child = n->prev ? n->prev : n->next;
! 701: }
! 702:
! 703: /* Adjust parse point, if applicable. */
! 704:
! 705: if (m && m->last == n) {
! 706: /*XXX: this can occur when bailing from validation. */
! 707: /*assert(NULL == n->next);*/
! 708: if (n->prev) {
1.21 schwarze 709: m->last = n->prev;
710: m->next = MAN_NEXT_SIBLING;
1.22 ! schwarze 711: } else {
1.21 schwarze 712: m->last = n->parent;
713: m->next = MAN_NEXT_CHILD;
714: }
715: }
716:
1.22 ! schwarze 717: if (m && m->first == n)
! 718: m->first = NULL;
1.4 schwarze 719: }
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