Annotation of mandoc/mansearch.c, Revision 1.15
1.15 ! schwarze 1: /* $Id: mansearch.c,v 1.14 2014/01/05 00:29:54 schwarze Exp $ */
1.1 kristaps 2: /*
3: * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.13 schwarze 4: * Copyright (c) 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
1.1 kristaps 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: #ifdef HAVE_CONFIG_H
19: #include "config.h"
20: #endif
21:
22: #include <assert.h>
23: #include <fcntl.h>
24: #include <getopt.h>
1.6 schwarze 25: #include <limits.h>
1.8 schwarze 26: #include <regex.h>
1.1 kristaps 27: #include <stdio.h>
28: #include <stdint.h>
29: #include <stddef.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <unistd.h>
33:
1.4 kristaps 34: #ifdef HAVE_OHASH
1.1 kristaps 35: #include <ohash.h>
1.4 kristaps 36: #else
37: #include "compat_ohash.h"
38: #endif
1.1 kristaps 39: #include <sqlite3.h>
40:
41: #include "mandoc.h"
42: #include "manpath.h"
43: #include "mansearch.h"
44:
1.3 kristaps 45: #define SQL_BIND_TEXT(_db, _s, _i, _v) \
1.8 schwarze 46: do { if (SQLITE_OK != sqlite3_bind_text \
1.2 kristaps 47: ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
1.8 schwarze 48: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
49: } while (0)
1.3 kristaps 50: #define SQL_BIND_INT64(_db, _s, _i, _v) \
1.8 schwarze 51: do { if (SQLITE_OK != sqlite3_bind_int64 \
1.2 kristaps 52: ((_s), (_i)++, (_v))) \
1.8 schwarze 53: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
54: } while (0)
55: #define SQL_BIND_BLOB(_db, _s, _i, _v) \
56: do { if (SQLITE_OK != sqlite3_bind_blob \
57: ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
58: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
59: } while (0)
1.2 kristaps 60:
1.1 kristaps 61: struct expr {
1.8 schwarze 62: uint64_t bits; /* type-mask */
63: const char *substr; /* to search for, if applicable */
64: regex_t regexp; /* compiled regexp, if applicable */
1.13 schwarze 65: int open; /* opening parentheses before */
66: int and; /* logical AND before */
67: int close; /* closing parentheses after */
1.8 schwarze 68: struct expr *next; /* next in sequence */
1.1 kristaps 69: };
70:
71: struct match {
72: uint64_t id; /* identifier in database */
73: char *file; /* relative filepath of manpage */
74: char *desc; /* description of manpage */
75: int form; /* 0 == catpage */
76: };
77:
78: struct type {
79: uint64_t bits;
80: const char *name;
81: };
82:
83: static const struct type types[] = {
84: { TYPE_An, "An" },
85: { TYPE_Ar, "Ar" },
86: { TYPE_At, "At" },
87: { TYPE_Bsx, "Bsx" },
88: { TYPE_Bx, "Bx" },
89: { TYPE_Cd, "Cd" },
90: { TYPE_Cm, "Cm" },
91: { TYPE_Dv, "Dv" },
92: { TYPE_Dx, "Dx" },
93: { TYPE_Em, "Em" },
94: { TYPE_Er, "Er" },
95: { TYPE_Ev, "Ev" },
96: { TYPE_Fa, "Fa" },
97: { TYPE_Fl, "Fl" },
98: { TYPE_Fn, "Fn" },
99: { TYPE_Fn, "Fo" },
100: { TYPE_Ft, "Ft" },
101: { TYPE_Fx, "Fx" },
102: { TYPE_Ic, "Ic" },
103: { TYPE_In, "In" },
104: { TYPE_Lb, "Lb" },
105: { TYPE_Li, "Li" },
106: { TYPE_Lk, "Lk" },
107: { TYPE_Ms, "Ms" },
108: { TYPE_Mt, "Mt" },
109: { TYPE_Nd, "Nd" },
110: { TYPE_Nm, "Nm" },
111: { TYPE_Nx, "Nx" },
112: { TYPE_Ox, "Ox" },
113: { TYPE_Pa, "Pa" },
114: { TYPE_Rs, "Rs" },
115: { TYPE_Sh, "Sh" },
116: { TYPE_Ss, "Ss" },
117: { TYPE_St, "St" },
118: { TYPE_Sy, "Sy" },
119: { TYPE_Tn, "Tn" },
120: { TYPE_Va, "Va" },
121: { TYPE_Va, "Vt" },
122: { TYPE_Xr, "Xr" },
1.14 schwarze 123: { TYPE_sec, "sec" },
124: { TYPE_arch,"arch" },
1.1 kristaps 125: { ~0ULL, "any" },
126: { 0ULL, NULL }
127: };
128:
1.11 schwarze 129: static char *buildnames(sqlite3 *, sqlite3_stmt *, uint64_t);
1.12 schwarze 130: static char *buildoutput(sqlite3 *, sqlite3_stmt *,
131: uint64_t, uint64_t);
1.1 kristaps 132: static void *hash_alloc(size_t, void *);
133: static void hash_free(void *, size_t, void *);
134: static void *hash_halloc(size_t, void *);
1.5 kristaps 135: static struct expr *exprcomp(const struct mansearch *,
136: int, char *[]);
1.1 kristaps 137: static void exprfree(struct expr *);
1.15 ! schwarze 138: static struct expr *exprspec(struct expr *, uint64_t,
! 139: const char *, const char *);
1.8 schwarze 140: static struct expr *exprterm(const struct mansearch *, char *, int);
1.13 schwarze 141: static void sql_append(char **sql, size_t *sz,
142: const char *newstr, int count);
1.7 schwarze 143: static void sql_match(sqlite3_context *context,
144: int argc, sqlite3_value **argv);
1.8 schwarze 145: static void sql_regexp(sqlite3_context *context,
146: int argc, sqlite3_value **argv);
1.15 ! schwarze 147: static char *sql_statement(const struct expr *);
1.1 kristaps 148:
149: int
1.5 kristaps 150: mansearch(const struct mansearch *search,
1.12 schwarze 151: const struct manpaths *paths,
152: int argc, char *argv[],
153: const char *outkey,
1.1 kristaps 154: struct manpage **res, size_t *sz)
155: {
1.12 schwarze 156: int fd, rc, c, ibit;
1.1 kristaps 157: int64_t id;
1.12 schwarze 158: uint64_t outbit;
1.6 schwarze 159: char buf[PATH_MAX];
1.11 schwarze 160: char *sql;
1.10 schwarze 161: struct manpage *mpage;
1.1 kristaps 162: struct expr *e, *ep;
163: sqlite3 *db;
1.12 schwarze 164: sqlite3_stmt *s, *s2;
1.1 kristaps 165: struct match *mp;
166: struct ohash_info info;
167: struct ohash htab;
168: unsigned int idx;
169: size_t i, j, cur, maxres;
170:
171: memset(&info, 0, sizeof(struct ohash_info));
172:
173: info.halloc = hash_halloc;
174: info.alloc = hash_alloc;
175: info.hfree = hash_free;
176: info.key_offset = offsetof(struct match, id);
177:
1.2 kristaps 178: *sz = cur = maxres = 0;
1.1 kristaps 179: sql = NULL;
180: *res = NULL;
181: fd = -1;
182: e = NULL;
1.2 kristaps 183: rc = 0;
1.1 kristaps 184:
185: if (0 == argc)
186: goto out;
1.5 kristaps 187: if (NULL == (e = exprcomp(search, argc, argv)))
1.1 kristaps 188: goto out;
189:
1.12 schwarze 190: outbit = 0;
191: if (NULL != outkey) {
192: for (ibit = 0; types[ibit].bits; ibit++) {
193: if (0 == strcasecmp(types[ibit].name, outkey)) {
194: outbit = types[ibit].bits;
195: break;
196: }
197: }
198: }
199:
1.1 kristaps 200: /*
201: * Save a descriptor to the current working directory.
202: * Since pathnames in the "paths" variable might be relative,
203: * and we'll be chdir()ing into them, we need to keep a handle
204: * on our current directory from which to start the chdir().
205: */
206:
1.6 schwarze 207: if (NULL == getcwd(buf, PATH_MAX)) {
1.1 kristaps 208: perror(NULL);
209: goto out;
210: } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
211: perror(buf);
212: goto out;
213: }
214:
1.15 ! schwarze 215: sql = sql_statement(e);
1.1 kristaps 216:
217: /*
218: * Loop over the directories (containing databases) for us to
219: * search.
220: * Don't let missing/bad databases/directories phase us.
221: * In each, try to open the resident database and, if it opens,
222: * scan it for our match expression.
223: */
224:
225: for (i = 0; i < paths->sz; i++) {
226: if (-1 == fchdir(fd)) {
227: perror(buf);
228: free(*res);
229: break;
230: } else if (-1 == chdir(paths->paths[i])) {
231: perror(paths->paths[i]);
232: continue;
233: }
234:
1.2 kristaps 235: c = sqlite3_open_v2
236: (MANDOC_DB, &db,
237: SQLITE_OPEN_READONLY, NULL);
1.1 kristaps 238:
1.2 kristaps 239: if (SQLITE_OK != c) {
1.1 kristaps 240: perror(MANDOC_DB);
241: sqlite3_close(db);
242: continue;
243: }
244:
1.8 schwarze 245: /*
246: * Define the SQL functions for substring
247: * and regular expression matching.
248: */
1.7 schwarze 249:
250: c = sqlite3_create_function(db, "match", 2,
251: SQLITE_ANY, NULL, sql_match, NULL, NULL);
1.8 schwarze 252: assert(SQLITE_OK == c);
253: c = sqlite3_create_function(db, "regexp", 2,
254: SQLITE_ANY, NULL, sql_regexp, NULL, NULL);
255: assert(SQLITE_OK == c);
1.7 schwarze 256:
1.1 kristaps 257: j = 1;
1.2 kristaps 258: c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
259: if (SQLITE_OK != c)
260: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
1.1 kristaps 261:
262: for (ep = e; NULL != ep; ep = ep->next) {
1.8 schwarze 263: if (NULL == ep->substr) {
264: SQL_BIND_BLOB(db, s, j, ep->regexp);
265: } else
266: SQL_BIND_TEXT(db, s, j, ep->substr);
1.3 kristaps 267: SQL_BIND_INT64(db, s, j, ep->bits);
1.1 kristaps 268: }
269:
270: memset(&htab, 0, sizeof(struct ohash));
271: ohash_init(&htab, 4, &info);
272:
273: /*
274: * Hash each entry on its [unique] document identifier.
275: * This is a uint64_t.
276: * Instead of using a hash function, simply convert the
277: * uint64_t to a uint32_t, the hash value's type.
278: * This gives good performance and preserves the
279: * distribution of buckets in the table.
280: */
1.2 kristaps 281: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.13 schwarze 282: id = sqlite3_column_int64(s, 5);
1.1 kristaps 283: idx = ohash_lookup_memory
284: (&htab, (char *)&id,
285: sizeof(uint64_t), (uint32_t)id);
286:
287: if (NULL != ohash_find(&htab, idx))
288: continue;
289:
290: mp = mandoc_calloc(1, sizeof(struct match));
291: mp->id = id;
292: mp->file = mandoc_strdup
1.13 schwarze 293: ((char *)sqlite3_column_text(s, 0));
294: mp->desc = mandoc_strdup
1.1 kristaps 295: ((char *)sqlite3_column_text(s, 3));
1.13 schwarze 296: mp->form = sqlite3_column_int(s, 4);
1.1 kristaps 297: ohash_insert(&htab, idx, mp);
298: }
299:
1.2 kristaps 300: if (SQLITE_DONE != c)
301: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
302:
1.1 kristaps 303: sqlite3_finalize(s);
1.10 schwarze 304:
305: c = sqlite3_prepare_v2(db,
306: "SELECT * FROM mlinks WHERE pageid=?",
307: -1, &s, NULL);
308: if (SQLITE_OK != c)
309: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
1.1 kristaps 310:
1.12 schwarze 311: c = sqlite3_prepare_v2(db,
312: "SELECT * FROM keys WHERE pageid=? AND bits & ?",
313: -1, &s2, NULL);
314: if (SQLITE_OK != c)
315: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
316:
1.1 kristaps 317: for (mp = ohash_first(&htab, &idx);
318: NULL != mp;
319: mp = ohash_next(&htab, &idx)) {
320: if (cur + 1 > maxres) {
321: maxres += 1024;
322: *res = mandoc_realloc
323: (*res, maxres * sizeof(struct manpage));
324: }
1.10 schwarze 325: mpage = *res + cur;
326: if (-1 == asprintf(&mpage->file, "%s/%s",
327: paths->paths[i], mp->file)) {
328: perror(0);
329: exit((int)MANDOCLEVEL_SYSERR);
330: }
331: mpage->desc = mp->desc;
332: mpage->form = mp->form;
1.11 schwarze 333: mpage->names = buildnames(db, s, mp->id);
1.12 schwarze 334: mpage->output = outbit ?
335: buildoutput(db, s2, mp->id, outbit) : NULL;
1.10 schwarze 336:
1.1 kristaps 337: free(mp->file);
338: free(mp);
339: cur++;
340: }
1.10 schwarze 341:
342: sqlite3_finalize(s);
1.12 schwarze 343: sqlite3_finalize(s2);
1.10 schwarze 344: sqlite3_close(db);
1.1 kristaps 345: ohash_delete(&htab);
346: }
1.2 kristaps 347: rc = 1;
1.1 kristaps 348: out:
349: exprfree(e);
350: if (-1 != fd)
351: close(fd);
352: free(sql);
353: *sz = cur;
1.2 kristaps 354: return(rc);
1.11 schwarze 355: }
356:
357: static char *
358: buildnames(sqlite3 *db, sqlite3_stmt *s, uint64_t id)
359: {
360: char *names, *newnames;
361: const char *oldnames, *sep1, *name, *sec, *sep2, *arch;
362: size_t i;
363: int c;
364:
365: names = NULL;
366: i = 1;
367: SQL_BIND_INT64(db, s, i, id);
368: while (SQLITE_ROW == (c = sqlite3_step(s))) {
369: if (NULL == names) {
370: oldnames = "";
371: sep1 = "";
372: } else {
373: oldnames = names;
374: sep1 = ", ";
375: }
376: sec = sqlite3_column_text(s, 1);
377: arch = sqlite3_column_text(s, 2);
378: name = sqlite3_column_text(s, 3);
379: sep2 = '\0' == *arch ? "" : "/";
380: if (-1 == asprintf(&newnames, "%s%s%s(%s%s%s)",
381: oldnames, sep1, name, sec, sep2, arch)) {
382: perror(0);
383: exit((int)MANDOCLEVEL_SYSERR);
384: }
385: free(names);
386: names = newnames;
387: }
388: if (SQLITE_DONE != c)
389: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
390: sqlite3_reset(s);
391: return(names);
1.12 schwarze 392: }
393:
394: static char *
395: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
396: {
397: char *output, *newoutput;
398: const char *oldoutput, *sep1, *data;
399: size_t i;
400: int c;
401:
402: output = NULL;
403: i = 1;
404: SQL_BIND_INT64(db, s, i, id);
405: SQL_BIND_INT64(db, s, i, outbit);
406: while (SQLITE_ROW == (c = sqlite3_step(s))) {
407: if (NULL == output) {
408: oldoutput = "";
409: sep1 = "";
410: } else {
411: oldoutput = output;
412: sep1 = " # ";
413: }
414: data = sqlite3_column_text(s, 1);
415: if (-1 == asprintf(&newoutput, "%s%s%s",
416: oldoutput, sep1, data)) {
417: perror(0);
418: exit((int)MANDOCLEVEL_SYSERR);
419: }
420: free(output);
421: output = newoutput;
422: }
423: if (SQLITE_DONE != c)
424: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
425: sqlite3_reset(s);
426: return(output);
1.1 kristaps 427: }
428:
429: /*
1.7 schwarze 430: * Implement substring match as an application-defined SQL function.
431: * Using the SQL LIKE or GLOB operators instead would be a bad idea
432: * because that would require escaping metacharacters in the string
433: * being searched for.
434: */
435: static void
436: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
437: {
438:
439: assert(2 == argc);
440: sqlite3_result_int(context, NULL != strcasestr(
441: (const char *)sqlite3_value_text(argv[1]),
442: (const char *)sqlite3_value_text(argv[0])));
443: }
444:
445: /*
1.8 schwarze 446: * Implement regular expression match
447: * as an application-defined SQL function.
448: */
449: static void
450: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
451: {
452:
453: assert(2 == argc);
454: sqlite3_result_int(context, !regexec(
455: (regex_t *)sqlite3_value_blob(argv[0]),
456: (const char *)sqlite3_value_text(argv[1]),
457: 0, NULL, 0));
458: }
459:
1.13 schwarze 460: static void
461: sql_append(char **sql, size_t *sz, const char *newstr, int count)
462: {
463: size_t newsz;
464:
465: newsz = 1 < count ? (size_t)count : strlen(newstr);
466: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
467: if (1 < count)
468: memset(*sql + *sz, *newstr, (size_t)count);
469: else
470: memcpy(*sql + *sz, newstr, newsz);
471: *sz += newsz;
472: (*sql)[*sz] = '\0';
473: }
474:
1.8 schwarze 475: /*
1.1 kristaps 476: * Prepare the search SQL statement.
477: */
478: static char *
1.15 ! schwarze 479: sql_statement(const struct expr *e)
1.1 kristaps 480: {
481: char *sql;
482: size_t sz;
1.13 schwarze 483: int needop;
1.1 kristaps 484:
1.13 schwarze 485: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 kristaps 486: sz = strlen(sql);
1.2 kristaps 487:
1.13 schwarze 488: for (needop = 0; NULL != e; e = e->next) {
489: if (e->and)
490: sql_append(&sql, &sz, " AND ", 1);
491: else if (needop)
492: sql_append(&sql, &sz, " OR ", 1);
493: if (e->open)
494: sql_append(&sql, &sz, "(", e->open);
495: sql_append(&sql, &sz, NULL == e->substr ?
496: "id IN (SELECT pageid FROM keys "
497: "WHERE key REGEXP ? AND bits & ?)" :
498: "id IN (SELECT pageid FROM keys "
499: "WHERE key MATCH ? AND bits & ?)", 1);
500: if (e->close)
501: sql_append(&sql, &sz, ")", e->close);
502: needop = 1;
1.1 kristaps 503: }
504:
505: return(sql);
506: }
507:
508: /*
509: * Compile a set of string tokens into an expression.
510: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
511: * "(", "foo=bar", etc.).
512: */
513: static struct expr *
1.5 kristaps 514: exprcomp(const struct mansearch *search, int argc, char *argv[])
1.1 kristaps 515: {
1.13 schwarze 516: int i, toopen, logic, igncase, toclose;
1.1 kristaps 517: struct expr *first, *next, *cur;
518:
519: first = cur = NULL;
1.15 ! schwarze 520: logic = igncase = toclose = 0;
! 521: toopen = 1;
1.1 kristaps 522:
523: for (i = 0; i < argc; i++) {
1.13 schwarze 524: if (0 == strcmp("(", argv[i])) {
525: if (igncase)
526: goto fail;
527: toopen++;
528: toclose++;
529: continue;
530: } else if (0 == strcmp(")", argv[i])) {
531: if (toopen || logic || igncase || NULL == cur)
532: goto fail;
533: cur->close++;
534: if (0 > --toclose)
535: goto fail;
536: continue;
537: } else if (0 == strcmp("-a", argv[i])) {
538: if (toopen || logic || igncase || NULL == cur)
539: goto fail;
540: logic = 1;
541: continue;
542: } else if (0 == strcmp("-o", argv[i])) {
543: if (toopen || logic || igncase || NULL == cur)
544: goto fail;
545: logic = 2;
546: continue;
547: } else if (0 == strcmp("-i", argv[i])) {
548: if (igncase)
549: goto fail;
550: igncase = 1;
551: continue;
1.1 kristaps 552: }
1.13 schwarze 553: next = exprterm(search, argv[i], !igncase);
554: if (NULL == next)
555: goto fail;
556: next->open = toopen;
557: next->and = (1 == logic);
1.1 kristaps 558: if (NULL != first) {
559: cur->next = next;
560: cur = next;
561: } else
562: cur = first = next;
1.13 schwarze 563: toopen = logic = igncase = 0;
1.1 kristaps 564: }
1.15 ! schwarze 565: if (toopen || logic || igncase || toclose)
! 566: goto fail;
! 567:
! 568: cur->close++;
! 569: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
! 570: exprspec(cur, TYPE_sec, search->sec, "^%s$");
! 571:
! 572: return(first);
! 573:
1.13 schwarze 574: fail:
575: if (NULL != first)
576: exprfree(first);
577: return(NULL);
1.1 kristaps 578: }
579:
580: static struct expr *
1.15 ! schwarze 581: exprspec(struct expr *cur, uint64_t key, const char *value,
! 582: const char *format)
! 583: {
! 584: char errbuf[BUFSIZ];
! 585: char *cp;
! 586: int irc;
! 587:
! 588: if (NULL == value)
! 589: return(cur);
! 590:
! 591: if (-1 == asprintf(&cp, format, value)) {
! 592: perror(0);
! 593: exit((int)MANDOCLEVEL_SYSERR);
! 594: }
! 595: cur->next = mandoc_calloc(1, sizeof(struct expr));
! 596: cur = cur->next;
! 597: cur->and = 1;
! 598: cur->bits = key;
! 599: if (0 != (irc = regcomp(&cur->regexp, cp,
! 600: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
! 601: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
! 602: fprintf(stderr, "regcomp: %s\n", errbuf);
! 603: cur->substr = value;
! 604: }
! 605: free(cp);
! 606: return(cur);
! 607: }
! 608:
! 609: static struct expr *
1.8 schwarze 610: exprterm(const struct mansearch *search, char *buf, int cs)
1.1 kristaps 611: {
1.15 ! schwarze 612: char errbuf[BUFSIZ];
1.1 kristaps 613: struct expr *e;
614: char *key, *v;
615: size_t i;
1.15 ! schwarze 616: int irc;
1.1 kristaps 617:
618: if ('\0' == *buf)
619: return(NULL);
620:
621: e = mandoc_calloc(1, sizeof(struct expr));
622:
1.5 kristaps 623: /*"whatis" mode uses an opaque string and default fields. */
624:
625: if (MANSEARCH_WHATIS & search->flags) {
1.8 schwarze 626: e->substr = buf;
1.5 kristaps 627: e->bits = search->deftype;
628: return(e);
629: }
630:
1.1 kristaps 631: /*
632: * If no =~ is specified, search with equality over names and
633: * descriptions.
634: * If =~ begins the phrase, use name and description fields.
635: */
636:
637: if (NULL == (v = strpbrk(buf, "=~"))) {
1.8 schwarze 638: e->substr = buf;
1.5 kristaps 639: e->bits = search->deftype;
1.1 kristaps 640: return(e);
641: } else if (v == buf)
1.5 kristaps 642: e->bits = search->deftype;
1.1 kristaps 643:
1.8 schwarze 644: if ('~' == *v++) {
1.15 ! schwarze 645: if (0 != (irc = regcomp(&e->regexp, v,
! 646: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
! 647: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
! 648: fprintf(stderr, "regcomp: %s\n", errbuf);
1.8 schwarze 649: free(e);
650: return(NULL);
651: }
652: } else
653: e->substr = v;
654: v[-1] = '\0';
1.1 kristaps 655:
656: /*
657: * Parse out all possible fields.
658: * If the field doesn't resolve, bail.
659: */
660:
661: while (NULL != (key = strsep(&buf, ","))) {
662: if ('\0' == *key)
663: continue;
664: i = 0;
665: while (types[i].bits &&
666: strcasecmp(types[i].name, key))
667: i++;
668: if (0 == types[i].bits) {
669: free(e);
670: return(NULL);
671: }
672: e->bits |= types[i].bits;
673: }
674:
675: return(e);
676: }
677:
678: static void
679: exprfree(struct expr *p)
680: {
681: struct expr *pp;
682:
683: while (NULL != p) {
684: pp = p->next;
685: free(p);
686: p = pp;
687: }
688: }
689:
690: static void *
691: hash_halloc(size_t sz, void *arg)
692: {
693:
694: return(mandoc_calloc(sz, 1));
695: }
696:
697: static void *
698: hash_alloc(size_t sz, void *arg)
699: {
700:
701: return(mandoc_malloc(sz));
702: }
703:
704: static void
705: hash_free(void *p, size_t sz, void *arg)
706: {
707:
708: free(p);
709: }
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