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1.7 ! schwarze 1: /* $Id: mansearch.c,v 1.6 2014/01/05 03:06:36 schwarze Exp $ */
1.1 schwarze 2: /*
3: * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.4 schwarze 4: * Copyright (c) 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
1.1 schwarze 5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.
17: */
18: #include <assert.h>
19: #include <fcntl.h>
20: #include <getopt.h>
21: #include <limits.h>
22: #include <regex.h>
23: #include <stdio.h>
24: #include <stdint.h>
25: #include <stddef.h>
26: #include <stdlib.h>
27: #include <string.h>
28: #include <unistd.h>
29:
30: #include <ohash.h>
31: #include <sqlite3.h>
32:
33: #include "mandoc.h"
34: #include "manpath.h"
35: #include "mansearch.h"
36:
37: #define SQL_BIND_TEXT(_db, _s, _i, _v) \
38: do { if (SQLITE_OK != sqlite3_bind_text \
39: ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
40: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
41: } while (0)
42: #define SQL_BIND_INT64(_db, _s, _i, _v) \
43: do { if (SQLITE_OK != sqlite3_bind_int64 \
44: ((_s), (_i)++, (_v))) \
45: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
46: } while (0)
47: #define SQL_BIND_BLOB(_db, _s, _i, _v) \
48: do { if (SQLITE_OK != sqlite3_bind_blob \
49: ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
50: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
51: } while (0)
52:
53: struct expr {
54: uint64_t bits; /* type-mask */
55: const char *substr; /* to search for, if applicable */
56: regex_t regexp; /* compiled regexp, if applicable */
1.4 schwarze 57: int open; /* opening parentheses before */
58: int and; /* logical AND before */
59: int close; /* closing parentheses after */
1.1 schwarze 60: struct expr *next; /* next in sequence */
61: };
62:
63: struct match {
64: uint64_t id; /* identifier in database */
65: char *file; /* relative filepath of manpage */
66: char *desc; /* description of manpage */
67: int form; /* 0 == catpage */
68: };
69:
70: struct type {
71: uint64_t bits;
72: const char *name;
73: };
74:
75: static const struct type types[] = {
76: { TYPE_An, "An" },
77: { TYPE_Ar, "Ar" },
78: { TYPE_At, "At" },
79: { TYPE_Bsx, "Bsx" },
80: { TYPE_Bx, "Bx" },
81: { TYPE_Cd, "Cd" },
82: { TYPE_Cm, "Cm" },
83: { TYPE_Dv, "Dv" },
84: { TYPE_Dx, "Dx" },
85: { TYPE_Em, "Em" },
86: { TYPE_Er, "Er" },
87: { TYPE_Ev, "Ev" },
88: { TYPE_Fa, "Fa" },
89: { TYPE_Fl, "Fl" },
90: { TYPE_Fn, "Fn" },
91: { TYPE_Fn, "Fo" },
92: { TYPE_Ft, "Ft" },
93: { TYPE_Fx, "Fx" },
94: { TYPE_Ic, "Ic" },
95: { TYPE_In, "In" },
96: { TYPE_Lb, "Lb" },
97: { TYPE_Li, "Li" },
98: { TYPE_Lk, "Lk" },
99: { TYPE_Ms, "Ms" },
100: { TYPE_Mt, "Mt" },
101: { TYPE_Nd, "Nd" },
102: { TYPE_Nm, "Nm" },
103: { TYPE_Nx, "Nx" },
104: { TYPE_Ox, "Ox" },
105: { TYPE_Pa, "Pa" },
106: { TYPE_Rs, "Rs" },
107: { TYPE_Sh, "Sh" },
108: { TYPE_Ss, "Ss" },
109: { TYPE_St, "St" },
110: { TYPE_Sy, "Sy" },
111: { TYPE_Tn, "Tn" },
112: { TYPE_Va, "Va" },
113: { TYPE_Va, "Vt" },
114: { TYPE_Xr, "Xr" },
1.5 schwarze 115: { TYPE_sec, "sec" },
116: { TYPE_arch,"arch" },
1.1 schwarze 117: { ~0ULL, "any" },
118: { 0ULL, NULL }
119: };
120:
1.2 schwarze 121: static char *buildnames(sqlite3 *, sqlite3_stmt *, uint64_t);
1.3 schwarze 122: static char *buildoutput(sqlite3 *, sqlite3_stmt *,
123: uint64_t, uint64_t);
1.1 schwarze 124: static void *hash_alloc(size_t, void *);
125: static void hash_free(void *, size_t, void *);
126: static void *hash_halloc(size_t, void *);
127: static struct expr *exprcomp(const struct mansearch *,
128: int, char *[]);
129: static void exprfree(struct expr *);
1.6 schwarze 130: static struct expr *exprspec(struct expr *, uint64_t,
131: const char *, const char *);
1.1 schwarze 132: static struct expr *exprterm(const struct mansearch *, char *, int);
1.4 schwarze 133: static void sql_append(char **sql, size_t *sz,
134: const char *newstr, int count);
1.1 schwarze 135: static void sql_match(sqlite3_context *context,
136: int argc, sqlite3_value **argv);
137: static void sql_regexp(sqlite3_context *context,
138: int argc, sqlite3_value **argv);
1.6 schwarze 139: static char *sql_statement(const struct expr *);
1.1 schwarze 140:
141: int
142: mansearch(const struct mansearch *search,
1.3 schwarze 143: const struct manpaths *paths,
144: int argc, char *argv[],
145: const char *outkey,
1.1 schwarze 146: struct manpage **res, size_t *sz)
147: {
1.3 schwarze 148: int fd, rc, c, ibit;
1.1 schwarze 149: int64_t id;
1.3 schwarze 150: uint64_t outbit;
1.1 schwarze 151: char buf[PATH_MAX];
1.2 schwarze 152: char *sql;
1.1 schwarze 153: struct manpage *mpage;
154: struct expr *e, *ep;
155: sqlite3 *db;
1.3 schwarze 156: sqlite3_stmt *s, *s2;
1.1 schwarze 157: struct match *mp;
158: struct ohash_info info;
159: struct ohash htab;
160: unsigned int idx;
161: size_t i, j, cur, maxres;
162:
163: memset(&info, 0, sizeof(struct ohash_info));
164:
165: info.halloc = hash_halloc;
166: info.alloc = hash_alloc;
167: info.hfree = hash_free;
168: info.key_offset = offsetof(struct match, id);
169:
170: *sz = cur = maxres = 0;
171: sql = NULL;
172: *res = NULL;
173: fd = -1;
174: e = NULL;
175: rc = 0;
176:
177: if (0 == argc)
178: goto out;
179: if (NULL == (e = exprcomp(search, argc, argv)))
180: goto out;
181:
1.3 schwarze 182: outbit = 0;
183: if (NULL != outkey) {
184: for (ibit = 0; types[ibit].bits; ibit++) {
185: if (0 == strcasecmp(types[ibit].name, outkey)) {
186: outbit = types[ibit].bits;
187: break;
188: }
189: }
190: }
191:
1.1 schwarze 192: /*
193: * Save a descriptor to the current working directory.
194: * Since pathnames in the "paths" variable might be relative,
195: * and we'll be chdir()ing into them, we need to keep a handle
196: * on our current directory from which to start the chdir().
197: */
198:
199: if (NULL == getcwd(buf, PATH_MAX)) {
200: perror(NULL);
201: goto out;
202: } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
203: perror(buf);
204: goto out;
205: }
206:
1.6 schwarze 207: sql = sql_statement(e);
1.1 schwarze 208:
209: /*
210: * Loop over the directories (containing databases) for us to
211: * search.
212: * Don't let missing/bad databases/directories phase us.
213: * In each, try to open the resident database and, if it opens,
214: * scan it for our match expression.
215: */
216:
217: for (i = 0; i < paths->sz; i++) {
218: if (-1 == fchdir(fd)) {
219: perror(buf);
220: free(*res);
221: break;
222: } else if (-1 == chdir(paths->paths[i])) {
223: perror(paths->paths[i]);
224: continue;
225: }
226:
227: c = sqlite3_open_v2
228: (MANDOC_DB, &db,
229: SQLITE_OPEN_READONLY, NULL);
230:
231: if (SQLITE_OK != c) {
232: perror(MANDOC_DB);
233: sqlite3_close(db);
234: continue;
235: }
236:
237: /*
238: * Define the SQL functions for substring
239: * and regular expression matching.
240: */
241:
242: c = sqlite3_create_function(db, "match", 2,
243: SQLITE_ANY, NULL, sql_match, NULL, NULL);
244: assert(SQLITE_OK == c);
245: c = sqlite3_create_function(db, "regexp", 2,
246: SQLITE_ANY, NULL, sql_regexp, NULL, NULL);
247: assert(SQLITE_OK == c);
248:
249: j = 1;
250: c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
251: if (SQLITE_OK != c)
252: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
253:
254: for (ep = e; NULL != ep; ep = ep->next) {
255: if (NULL == ep->substr) {
256: SQL_BIND_BLOB(db, s, j, ep->regexp);
257: } else
258: SQL_BIND_TEXT(db, s, j, ep->substr);
259: SQL_BIND_INT64(db, s, j, ep->bits);
260: }
261:
262: memset(&htab, 0, sizeof(struct ohash));
263: ohash_init(&htab, 4, &info);
264:
265: /*
266: * Hash each entry on its [unique] document identifier.
267: * This is a uint64_t.
268: * Instead of using a hash function, simply convert the
269: * uint64_t to a uint32_t, the hash value's type.
270: * This gives good performance and preserves the
271: * distribution of buckets in the table.
272: */
273: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.7 ! schwarze 274: id = sqlite3_column_int64(s, 3);
1.1 schwarze 275: idx = ohash_lookup_memory
276: (&htab, (char *)&id,
277: sizeof(uint64_t), (uint32_t)id);
278:
279: if (NULL != ohash_find(&htab, idx))
280: continue;
281:
282: mp = mandoc_calloc(1, sizeof(struct match));
283: mp->id = id;
284: mp->file = mandoc_strdup
1.4 schwarze 285: ((char *)sqlite3_column_text(s, 0));
286: mp->desc = mandoc_strdup
1.7 ! schwarze 287: ((char *)sqlite3_column_text(s, 1));
! 288: mp->form = sqlite3_column_int(s, 2);
1.1 schwarze 289: ohash_insert(&htab, idx, mp);
290: }
291:
292: if (SQLITE_DONE != c)
293: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
294:
295: sqlite3_finalize(s);
296:
297: c = sqlite3_prepare_v2(db,
298: "SELECT * FROM mlinks WHERE pageid=?",
299: -1, &s, NULL);
300: if (SQLITE_OK != c)
301: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
302:
1.3 schwarze 303: c = sqlite3_prepare_v2(db,
304: "SELECT * FROM keys WHERE pageid=? AND bits & ?",
305: -1, &s2, NULL);
306: if (SQLITE_OK != c)
307: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
308:
1.1 schwarze 309: for (mp = ohash_first(&htab, &idx);
310: NULL != mp;
311: mp = ohash_next(&htab, &idx)) {
312: if (cur + 1 > maxres) {
313: maxres += 1024;
314: *res = mandoc_realloc
315: (*res, maxres * sizeof(struct manpage));
316: }
317: mpage = *res + cur;
318: if (-1 == asprintf(&mpage->file, "%s/%s",
319: paths->paths[i], mp->file)) {
320: perror(0);
321: exit((int)MANDOCLEVEL_SYSERR);
322: }
323: mpage->desc = mp->desc;
324: mpage->form = mp->form;
1.2 schwarze 325: mpage->names = buildnames(db, s, mp->id);
1.3 schwarze 326: mpage->output = outbit ?
327: buildoutput(db, s2, mp->id, outbit) : NULL;
1.1 schwarze 328:
329: free(mp->file);
330: free(mp);
331: cur++;
332: }
333:
334: sqlite3_finalize(s);
1.3 schwarze 335: sqlite3_finalize(s2);
1.1 schwarze 336: sqlite3_close(db);
337: ohash_delete(&htab);
338: }
339: rc = 1;
340: out:
341: exprfree(e);
342: if (-1 != fd)
343: close(fd);
344: free(sql);
345: *sz = cur;
346: return(rc);
1.2 schwarze 347: }
348:
349: static char *
350: buildnames(sqlite3 *db, sqlite3_stmt *s, uint64_t id)
351: {
352: char *names, *newnames;
353: const char *oldnames, *sep1, *name, *sec, *sep2, *arch;
354: size_t i;
355: int c;
356:
357: names = NULL;
358: i = 1;
359: SQL_BIND_INT64(db, s, i, id);
360: while (SQLITE_ROW == (c = sqlite3_step(s))) {
361: if (NULL == names) {
362: oldnames = "";
363: sep1 = "";
364: } else {
365: oldnames = names;
366: sep1 = ", ";
367: }
368: sec = sqlite3_column_text(s, 1);
369: arch = sqlite3_column_text(s, 2);
370: name = sqlite3_column_text(s, 3);
371: sep2 = '\0' == *arch ? "" : "/";
372: if (-1 == asprintf(&newnames, "%s%s%s(%s%s%s)",
373: oldnames, sep1, name, sec, sep2, arch)) {
374: perror(0);
375: exit((int)MANDOCLEVEL_SYSERR);
376: }
377: free(names);
378: names = newnames;
379: }
380: if (SQLITE_DONE != c)
381: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
382: sqlite3_reset(s);
383: return(names);
1.3 schwarze 384: }
385:
386: static char *
387: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
388: {
389: char *output, *newoutput;
390: const char *oldoutput, *sep1, *data;
391: size_t i;
392: int c;
393:
394: output = NULL;
395: i = 1;
396: SQL_BIND_INT64(db, s, i, id);
397: SQL_BIND_INT64(db, s, i, outbit);
398: while (SQLITE_ROW == (c = sqlite3_step(s))) {
399: if (NULL == output) {
400: oldoutput = "";
401: sep1 = "";
402: } else {
403: oldoutput = output;
404: sep1 = " # ";
405: }
406: data = sqlite3_column_text(s, 1);
407: if (-1 == asprintf(&newoutput, "%s%s%s",
408: oldoutput, sep1, data)) {
409: perror(0);
410: exit((int)MANDOCLEVEL_SYSERR);
411: }
412: free(output);
413: output = newoutput;
414: }
415: if (SQLITE_DONE != c)
416: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
417: sqlite3_reset(s);
418: return(output);
1.1 schwarze 419: }
420:
421: /*
422: * Implement substring match as an application-defined SQL function.
423: * Using the SQL LIKE or GLOB operators instead would be a bad idea
424: * because that would require escaping metacharacters in the string
425: * being searched for.
426: */
427: static void
428: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
429: {
430:
431: assert(2 == argc);
432: sqlite3_result_int(context, NULL != strcasestr(
433: (const char *)sqlite3_value_text(argv[1]),
434: (const char *)sqlite3_value_text(argv[0])));
435: }
436:
437: /*
438: * Implement regular expression match
439: * as an application-defined SQL function.
440: */
441: static void
442: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
443: {
444:
445: assert(2 == argc);
446: sqlite3_result_int(context, !regexec(
447: (regex_t *)sqlite3_value_blob(argv[0]),
448: (const char *)sqlite3_value_text(argv[1]),
449: 0, NULL, 0));
450: }
451:
1.4 schwarze 452: static void
453: sql_append(char **sql, size_t *sz, const char *newstr, int count)
454: {
455: size_t newsz;
456:
457: newsz = 1 < count ? (size_t)count : strlen(newstr);
458: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
459: if (1 < count)
460: memset(*sql + *sz, *newstr, (size_t)count);
461: else
462: memcpy(*sql + *sz, newstr, newsz);
463: *sz += newsz;
464: (*sql)[*sz] = '\0';
465: }
466:
1.1 schwarze 467: /*
468: * Prepare the search SQL statement.
469: */
470: static char *
1.6 schwarze 471: sql_statement(const struct expr *e)
1.1 schwarze 472: {
473: char *sql;
474: size_t sz;
1.4 schwarze 475: int needop;
1.1 schwarze 476:
1.4 schwarze 477: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 schwarze 478: sz = strlen(sql);
479:
1.4 schwarze 480: for (needop = 0; NULL != e; e = e->next) {
481: if (e->and)
482: sql_append(&sql, &sz, " AND ", 1);
483: else if (needop)
484: sql_append(&sql, &sz, " OR ", 1);
485: if (e->open)
486: sql_append(&sql, &sz, "(", e->open);
487: sql_append(&sql, &sz, NULL == e->substr ?
488: "id IN (SELECT pageid FROM keys "
489: "WHERE key REGEXP ? AND bits & ?)" :
490: "id IN (SELECT pageid FROM keys "
491: "WHERE key MATCH ? AND bits & ?)", 1);
492: if (e->close)
493: sql_append(&sql, &sz, ")", e->close);
494: needop = 1;
1.1 schwarze 495: }
496:
497: return(sql);
498: }
499:
500: /*
501: * Compile a set of string tokens into an expression.
502: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
503: * "(", "foo=bar", etc.).
504: */
505: static struct expr *
506: exprcomp(const struct mansearch *search, int argc, char *argv[])
507: {
1.4 schwarze 508: int i, toopen, logic, igncase, toclose;
1.1 schwarze 509: struct expr *first, *next, *cur;
510:
511: first = cur = NULL;
1.6 schwarze 512: logic = igncase = toclose = 0;
513: toopen = 1;
1.1 schwarze 514:
515: for (i = 0; i < argc; i++) {
1.4 schwarze 516: if (0 == strcmp("(", argv[i])) {
517: if (igncase)
518: goto fail;
519: toopen++;
520: toclose++;
521: continue;
522: } else if (0 == strcmp(")", argv[i])) {
523: if (toopen || logic || igncase || NULL == cur)
524: goto fail;
525: cur->close++;
526: if (0 > --toclose)
527: goto fail;
528: continue;
529: } else if (0 == strcmp("-a", argv[i])) {
530: if (toopen || logic || igncase || NULL == cur)
531: goto fail;
532: logic = 1;
533: continue;
534: } else if (0 == strcmp("-o", argv[i])) {
535: if (toopen || logic || igncase || NULL == cur)
536: goto fail;
537: logic = 2;
538: continue;
539: } else if (0 == strcmp("-i", argv[i])) {
540: if (igncase)
541: goto fail;
542: igncase = 1;
543: continue;
1.1 schwarze 544: }
1.4 schwarze 545: next = exprterm(search, argv[i], !igncase);
546: if (NULL == next)
547: goto fail;
548: next->open = toopen;
549: next->and = (1 == logic);
1.1 schwarze 550: if (NULL != first) {
551: cur->next = next;
552: cur = next;
553: } else
554: cur = first = next;
1.4 schwarze 555: toopen = logic = igncase = 0;
1.1 schwarze 556: }
1.6 schwarze 557: if (toopen || logic || igncase || toclose)
558: goto fail;
559:
560: cur->close++;
561: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
562: exprspec(cur, TYPE_sec, search->sec, "^%s$");
563:
564: return(first);
565:
1.4 schwarze 566: fail:
567: if (NULL != first)
568: exprfree(first);
569: return(NULL);
1.1 schwarze 570: }
571:
572: static struct expr *
1.6 schwarze 573: exprspec(struct expr *cur, uint64_t key, const char *value,
574: const char *format)
575: {
576: char errbuf[BUFSIZ];
577: char *cp;
578: int irc;
579:
580: if (NULL == value)
581: return(cur);
582:
583: if (-1 == asprintf(&cp, format, value)) {
584: perror(0);
585: exit((int)MANDOCLEVEL_SYSERR);
586: }
587: cur->next = mandoc_calloc(1, sizeof(struct expr));
588: cur = cur->next;
589: cur->and = 1;
590: cur->bits = key;
591: if (0 != (irc = regcomp(&cur->regexp, cp,
592: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
593: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
594: fprintf(stderr, "regcomp: %s\n", errbuf);
595: cur->substr = value;
596: }
597: free(cp);
598: return(cur);
599: }
600:
601: static struct expr *
1.1 schwarze 602: exprterm(const struct mansearch *search, char *buf, int cs)
603: {
1.6 schwarze 604: char errbuf[BUFSIZ];
1.1 schwarze 605: struct expr *e;
606: char *key, *v;
607: size_t i;
1.6 schwarze 608: int irc;
1.1 schwarze 609:
610: if ('\0' == *buf)
611: return(NULL);
612:
613: e = mandoc_calloc(1, sizeof(struct expr));
614:
615: /*"whatis" mode uses an opaque string and default fields. */
616:
617: if (MANSEARCH_WHATIS & search->flags) {
618: e->substr = buf;
619: e->bits = search->deftype;
620: return(e);
621: }
622:
623: /*
624: * If no =~ is specified, search with equality over names and
625: * descriptions.
626: * If =~ begins the phrase, use name and description fields.
627: */
628:
629: if (NULL == (v = strpbrk(buf, "=~"))) {
630: e->substr = buf;
631: e->bits = search->deftype;
632: return(e);
633: } else if (v == buf)
634: e->bits = search->deftype;
635:
636: if ('~' == *v++) {
1.6 schwarze 637: if (0 != (irc = regcomp(&e->regexp, v,
638: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
639: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
640: fprintf(stderr, "regcomp: %s\n", errbuf);
1.1 schwarze 641: free(e);
642: return(NULL);
643: }
644: } else
645: e->substr = v;
646: v[-1] = '\0';
647:
648: /*
649: * Parse out all possible fields.
650: * If the field doesn't resolve, bail.
651: */
652:
653: while (NULL != (key = strsep(&buf, ","))) {
654: if ('\0' == *key)
655: continue;
656: i = 0;
657: while (types[i].bits &&
658: strcasecmp(types[i].name, key))
659: i++;
660: if (0 == types[i].bits) {
661: free(e);
662: return(NULL);
663: }
664: e->bits |= types[i].bits;
665: }
666:
667: return(e);
668: }
669:
670: static void
671: exprfree(struct expr *p)
672: {
673: struct expr *pp;
674:
675: while (NULL != p) {
676: pp = p->next;
677: free(p);
678: p = pp;
679: }
680: }
681:
682: static void *
683: hash_halloc(size_t sz, void *arg)
684: {
685:
686: return(mandoc_calloc(sz, 1));
687: }
688:
689: static void *
690: hash_alloc(size_t sz, void *arg)
691: {
692:
693: return(mandoc_malloc(sz));
694: }
695:
696: static void
697: hash_free(void *p, size_t sz, void *arg)
698: {
699:
700: free(p);
701: }