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1.8 ! schwarze 1: /* $Id: mansearch.c,v 1.7 2014/01/05 03:25:51 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 *desc; /* description of manpage */
66: int form; /* 0 == catpage */
67: };
68:
69: struct type {
70: uint64_t bits;
71: const char *name;
72: };
73:
74: static const struct type types[] = {
75: { TYPE_An, "An" },
76: { TYPE_Ar, "Ar" },
77: { TYPE_At, "At" },
78: { TYPE_Bsx, "Bsx" },
79: { TYPE_Bx, "Bx" },
80: { TYPE_Cd, "Cd" },
81: { TYPE_Cm, "Cm" },
82: { TYPE_Dv, "Dv" },
83: { TYPE_Dx, "Dx" },
84: { TYPE_Em, "Em" },
85: { TYPE_Er, "Er" },
86: { TYPE_Ev, "Ev" },
87: { TYPE_Fa, "Fa" },
88: { TYPE_Fl, "Fl" },
89: { TYPE_Fn, "Fn" },
90: { TYPE_Fn, "Fo" },
91: { TYPE_Ft, "Ft" },
92: { TYPE_Fx, "Fx" },
93: { TYPE_Ic, "Ic" },
94: { TYPE_In, "In" },
95: { TYPE_Lb, "Lb" },
96: { TYPE_Li, "Li" },
97: { TYPE_Lk, "Lk" },
98: { TYPE_Ms, "Ms" },
99: { TYPE_Mt, "Mt" },
100: { TYPE_Nd, "Nd" },
101: { TYPE_Nm, "Nm" },
102: { TYPE_Nx, "Nx" },
103: { TYPE_Ox, "Ox" },
104: { TYPE_Pa, "Pa" },
105: { TYPE_Rs, "Rs" },
106: { TYPE_Sh, "Sh" },
107: { TYPE_Ss, "Ss" },
108: { TYPE_St, "St" },
109: { TYPE_Sy, "Sy" },
110: { TYPE_Tn, "Tn" },
111: { TYPE_Va, "Va" },
112: { TYPE_Va, "Vt" },
113: { TYPE_Xr, "Xr" },
1.5 schwarze 114: { TYPE_sec, "sec" },
115: { TYPE_arch,"arch" },
1.1 schwarze 116: { ~0ULL, "any" },
117: { 0ULL, NULL }
118: };
119:
1.8 ! schwarze 120: static void buildnames(struct manpage *, sqlite3 *,
! 121: sqlite3_stmt *, uint64_t, const char *);
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))) {
1.8 ! schwarze 274: id = sqlite3_column_int64(s, 2);
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;
1.8 ! schwarze 284: mp->desc = mandoc_strdup
1.4 schwarze 285: ((char *)sqlite3_column_text(s, 0));
1.8 ! schwarze 286: mp->form = sqlite3_column_int(s, 1);
1.1 schwarze 287: ohash_insert(&htab, idx, mp);
288: }
289:
290: if (SQLITE_DONE != c)
291: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
292:
293: sqlite3_finalize(s);
294:
295: c = sqlite3_prepare_v2(db,
296: "SELECT * FROM mlinks WHERE pageid=?",
297: -1, &s, NULL);
298: if (SQLITE_OK != c)
299: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
300:
1.3 schwarze 301: c = sqlite3_prepare_v2(db,
302: "SELECT * FROM keys WHERE pageid=? AND bits & ?",
303: -1, &s2, NULL);
304: if (SQLITE_OK != c)
305: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
306:
1.1 schwarze 307: for (mp = ohash_first(&htab, &idx);
308: NULL != mp;
309: mp = ohash_next(&htab, &idx)) {
310: if (cur + 1 > maxres) {
311: maxres += 1024;
312: *res = mandoc_realloc
313: (*res, maxres * sizeof(struct manpage));
314: }
315: mpage = *res + cur;
316: mpage->desc = mp->desc;
317: mpage->form = mp->form;
1.8 ! schwarze 318: buildnames(mpage, db, s, mp->id, paths->paths[i]);
1.3 schwarze 319: mpage->output = outbit ?
320: buildoutput(db, s2, mp->id, outbit) : NULL;
1.1 schwarze 321:
322: free(mp);
323: cur++;
324: }
325:
326: sqlite3_finalize(s);
1.3 schwarze 327: sqlite3_finalize(s2);
1.1 schwarze 328: sqlite3_close(db);
329: ohash_delete(&htab);
330: }
331: rc = 1;
332: out:
333: exprfree(e);
334: if (-1 != fd)
335: close(fd);
336: free(sql);
337: *sz = cur;
338: return(rc);
1.2 schwarze 339: }
340:
1.8 ! schwarze 341: static void
! 342: buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
! 343: uint64_t id, const char *path)
1.2 schwarze 344: {
1.8 ! schwarze 345: char *newnames;
1.2 schwarze 346: const char *oldnames, *sep1, *name, *sec, *sep2, *arch;
347: size_t i;
348: int c;
349:
1.8 ! schwarze 350: mpage->names = NULL;
1.2 schwarze 351: i = 1;
352: SQL_BIND_INT64(db, s, i, id);
353: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.8 ! schwarze 354:
! 355: /* Assemble the list of names. */
! 356:
! 357: if (NULL == mpage->names) {
1.2 schwarze 358: oldnames = "";
359: sep1 = "";
360: } else {
1.8 ! schwarze 361: oldnames = mpage->names;
1.2 schwarze 362: sep1 = ", ";
363: }
364: sec = sqlite3_column_text(s, 1);
365: arch = sqlite3_column_text(s, 2);
366: name = sqlite3_column_text(s, 3);
367: sep2 = '\0' == *arch ? "" : "/";
368: if (-1 == asprintf(&newnames, "%s%s%s(%s%s%s)",
369: oldnames, sep1, name, sec, sep2, arch)) {
370: perror(0);
371: exit((int)MANDOCLEVEL_SYSERR);
372: }
1.8 ! schwarze 373: free(mpage->names);
! 374: mpage->names = newnames;
! 375:
! 376: /* Also save the first file name encountered. */
! 377:
! 378: if (NULL != mpage->file)
! 379: continue;
! 380:
! 381: name = sqlite3_column_text(s, 0);
! 382: if (-1 == asprintf(&mpage->file, "%s/%s", path, name)) {
! 383: perror(0);
! 384: exit((int)MANDOCLEVEL_SYSERR);
! 385: }
1.2 schwarze 386: }
387: if (SQLITE_DONE != c)
388: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
389: sqlite3_reset(s);
1.3 schwarze 390: }
391:
392: static char *
393: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
394: {
395: char *output, *newoutput;
396: const char *oldoutput, *sep1, *data;
397: size_t i;
398: int c;
399:
400: output = NULL;
401: i = 1;
402: SQL_BIND_INT64(db, s, i, id);
403: SQL_BIND_INT64(db, s, i, outbit);
404: while (SQLITE_ROW == (c = sqlite3_step(s))) {
405: if (NULL == output) {
406: oldoutput = "";
407: sep1 = "";
408: } else {
409: oldoutput = output;
410: sep1 = " # ";
411: }
412: data = sqlite3_column_text(s, 1);
413: if (-1 == asprintf(&newoutput, "%s%s%s",
414: oldoutput, sep1, data)) {
415: perror(0);
416: exit((int)MANDOCLEVEL_SYSERR);
417: }
418: free(output);
419: output = newoutput;
420: }
421: if (SQLITE_DONE != c)
422: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
423: sqlite3_reset(s);
424: return(output);
1.1 schwarze 425: }
426:
427: /*
428: * Implement substring match as an application-defined SQL function.
429: * Using the SQL LIKE or GLOB operators instead would be a bad idea
430: * because that would require escaping metacharacters in the string
431: * being searched for.
432: */
433: static void
434: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
435: {
436:
437: assert(2 == argc);
438: sqlite3_result_int(context, NULL != strcasestr(
439: (const char *)sqlite3_value_text(argv[1]),
440: (const char *)sqlite3_value_text(argv[0])));
441: }
442:
443: /*
444: * Implement regular expression match
445: * as an application-defined SQL function.
446: */
447: static void
448: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
449: {
450:
451: assert(2 == argc);
452: sqlite3_result_int(context, !regexec(
453: (regex_t *)sqlite3_value_blob(argv[0]),
454: (const char *)sqlite3_value_text(argv[1]),
455: 0, NULL, 0));
456: }
457:
1.4 schwarze 458: static void
459: sql_append(char **sql, size_t *sz, const char *newstr, int count)
460: {
461: size_t newsz;
462:
463: newsz = 1 < count ? (size_t)count : strlen(newstr);
464: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
465: if (1 < count)
466: memset(*sql + *sz, *newstr, (size_t)count);
467: else
468: memcpy(*sql + *sz, newstr, newsz);
469: *sz += newsz;
470: (*sql)[*sz] = '\0';
471: }
472:
1.1 schwarze 473: /*
474: * Prepare the search SQL statement.
475: */
476: static char *
1.6 schwarze 477: sql_statement(const struct expr *e)
1.1 schwarze 478: {
479: char *sql;
480: size_t sz;
1.4 schwarze 481: int needop;
1.1 schwarze 482:
1.4 schwarze 483: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 schwarze 484: sz = strlen(sql);
485:
1.4 schwarze 486: for (needop = 0; NULL != e; e = e->next) {
487: if (e->and)
488: sql_append(&sql, &sz, " AND ", 1);
489: else if (needop)
490: sql_append(&sql, &sz, " OR ", 1);
491: if (e->open)
492: sql_append(&sql, &sz, "(", e->open);
493: sql_append(&sql, &sz, NULL == e->substr ?
494: "id IN (SELECT pageid FROM keys "
495: "WHERE key REGEXP ? AND bits & ?)" :
496: "id IN (SELECT pageid FROM keys "
497: "WHERE key MATCH ? AND bits & ?)", 1);
498: if (e->close)
499: sql_append(&sql, &sz, ")", e->close);
500: needop = 1;
1.1 schwarze 501: }
502:
503: return(sql);
504: }
505:
506: /*
507: * Compile a set of string tokens into an expression.
508: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
509: * "(", "foo=bar", etc.).
510: */
511: static struct expr *
512: exprcomp(const struct mansearch *search, int argc, char *argv[])
513: {
1.4 schwarze 514: int i, toopen, logic, igncase, toclose;
1.1 schwarze 515: struct expr *first, *next, *cur;
516:
517: first = cur = NULL;
1.6 schwarze 518: logic = igncase = toclose = 0;
519: toopen = 1;
1.1 schwarze 520:
521: for (i = 0; i < argc; i++) {
1.4 schwarze 522: if (0 == strcmp("(", argv[i])) {
523: if (igncase)
524: goto fail;
525: toopen++;
526: toclose++;
527: continue;
528: } else if (0 == strcmp(")", argv[i])) {
529: if (toopen || logic || igncase || NULL == cur)
530: goto fail;
531: cur->close++;
532: if (0 > --toclose)
533: goto fail;
534: continue;
535: } else if (0 == strcmp("-a", argv[i])) {
536: if (toopen || logic || igncase || NULL == cur)
537: goto fail;
538: logic = 1;
539: continue;
540: } else if (0 == strcmp("-o", argv[i])) {
541: if (toopen || logic || igncase || NULL == cur)
542: goto fail;
543: logic = 2;
544: continue;
545: } else if (0 == strcmp("-i", argv[i])) {
546: if (igncase)
547: goto fail;
548: igncase = 1;
549: continue;
1.1 schwarze 550: }
1.4 schwarze 551: next = exprterm(search, argv[i], !igncase);
552: if (NULL == next)
553: goto fail;
554: next->open = toopen;
555: next->and = (1 == logic);
1.1 schwarze 556: if (NULL != first) {
557: cur->next = next;
558: cur = next;
559: } else
560: cur = first = next;
1.4 schwarze 561: toopen = logic = igncase = 0;
1.1 schwarze 562: }
1.6 schwarze 563: if (toopen || logic || igncase || toclose)
564: goto fail;
565:
566: cur->close++;
567: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
568: exprspec(cur, TYPE_sec, search->sec, "^%s$");
569:
570: return(first);
571:
1.4 schwarze 572: fail:
573: if (NULL != first)
574: exprfree(first);
575: return(NULL);
1.1 schwarze 576: }
577:
578: static struct expr *
1.6 schwarze 579: exprspec(struct expr *cur, uint64_t key, const char *value,
580: const char *format)
581: {
582: char errbuf[BUFSIZ];
583: char *cp;
584: int irc;
585:
586: if (NULL == value)
587: return(cur);
588:
589: if (-1 == asprintf(&cp, format, value)) {
590: perror(0);
591: exit((int)MANDOCLEVEL_SYSERR);
592: }
593: cur->next = mandoc_calloc(1, sizeof(struct expr));
594: cur = cur->next;
595: cur->and = 1;
596: cur->bits = key;
597: if (0 != (irc = regcomp(&cur->regexp, cp,
598: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
599: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
600: fprintf(stderr, "regcomp: %s\n", errbuf);
601: cur->substr = value;
602: }
603: free(cp);
604: return(cur);
605: }
606:
607: static struct expr *
1.1 schwarze 608: exprterm(const struct mansearch *search, char *buf, int cs)
609: {
1.6 schwarze 610: char errbuf[BUFSIZ];
1.1 schwarze 611: struct expr *e;
612: char *key, *v;
613: size_t i;
1.6 schwarze 614: int irc;
1.1 schwarze 615:
616: if ('\0' == *buf)
617: return(NULL);
618:
619: e = mandoc_calloc(1, sizeof(struct expr));
620:
621: /*"whatis" mode uses an opaque string and default fields. */
622:
623: if (MANSEARCH_WHATIS & search->flags) {
624: e->substr = buf;
625: e->bits = search->deftype;
626: return(e);
627: }
628:
629: /*
630: * If no =~ is specified, search with equality over names and
631: * descriptions.
632: * If =~ begins the phrase, use name and description fields.
633: */
634:
635: if (NULL == (v = strpbrk(buf, "=~"))) {
636: e->substr = buf;
637: e->bits = search->deftype;
638: return(e);
639: } else if (v == buf)
640: e->bits = search->deftype;
641:
642: if ('~' == *v++) {
1.6 schwarze 643: if (0 != (irc = regcomp(&e->regexp, v,
644: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
645: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
646: fprintf(stderr, "regcomp: %s\n", errbuf);
1.1 schwarze 647: free(e);
648: return(NULL);
649: }
650: } else
651: e->substr = v;
652: v[-1] = '\0';
653:
654: /*
655: * Parse out all possible fields.
656: * If the field doesn't resolve, bail.
657: */
658:
659: while (NULL != (key = strsep(&buf, ","))) {
660: if ('\0' == *key)
661: continue;
662: i = 0;
663: while (types[i].bits &&
664: strcasecmp(types[i].name, key))
665: i++;
666: if (0 == types[i].bits) {
667: free(e);
668: return(NULL);
669: }
670: e->bits |= types[i].bits;
671: }
672:
673: return(e);
674: }
675:
676: static void
677: exprfree(struct expr *p)
678: {
679: struct expr *pp;
680:
681: while (NULL != p) {
682: pp = p->next;
683: free(p);
684: p = pp;
685: }
686: }
687:
688: static void *
689: hash_halloc(size_t sz, void *arg)
690: {
691:
692: return(mandoc_calloc(sz, 1));
693: }
694:
695: static void *
696: hash_alloc(size_t sz, void *arg)
697: {
698:
699: return(mandoc_malloc(sz));
700: }
701:
702: static void
703: hash_free(void *p, size_t sz, void *arg)
704: {
705:
706: free(p);
707: }