Annotation of mandoc/mansearch.c, Revision 1.17
1.17 ! schwarze 1: /* $Id: mansearch.c,v 1.16 2014/01/05 03:25:51 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 *desc; /* description of manpage */
74: int form; /* 0 == catpage */
75: };
76:
77: struct type {
78: uint64_t bits;
79: const char *name;
80: };
81:
82: static const struct type types[] = {
83: { TYPE_An, "An" },
84: { TYPE_Ar, "Ar" },
85: { TYPE_At, "At" },
86: { TYPE_Bsx, "Bsx" },
87: { TYPE_Bx, "Bx" },
88: { TYPE_Cd, "Cd" },
89: { TYPE_Cm, "Cm" },
90: { TYPE_Dv, "Dv" },
91: { TYPE_Dx, "Dx" },
92: { TYPE_Em, "Em" },
93: { TYPE_Er, "Er" },
94: { TYPE_Ev, "Ev" },
95: { TYPE_Fa, "Fa" },
96: { TYPE_Fl, "Fl" },
97: { TYPE_Fn, "Fn" },
98: { TYPE_Fn, "Fo" },
99: { TYPE_Ft, "Ft" },
100: { TYPE_Fx, "Fx" },
101: { TYPE_Ic, "Ic" },
102: { TYPE_In, "In" },
103: { TYPE_Lb, "Lb" },
104: { TYPE_Li, "Li" },
105: { TYPE_Lk, "Lk" },
106: { TYPE_Ms, "Ms" },
107: { TYPE_Mt, "Mt" },
108: { TYPE_Nd, "Nd" },
109: { TYPE_Nm, "Nm" },
110: { TYPE_Nx, "Nx" },
111: { TYPE_Ox, "Ox" },
112: { TYPE_Pa, "Pa" },
113: { TYPE_Rs, "Rs" },
114: { TYPE_Sh, "Sh" },
115: { TYPE_Ss, "Ss" },
116: { TYPE_St, "St" },
117: { TYPE_Sy, "Sy" },
118: { TYPE_Tn, "Tn" },
119: { TYPE_Va, "Va" },
120: { TYPE_Va, "Vt" },
121: { TYPE_Xr, "Xr" },
1.14 schwarze 122: { TYPE_sec, "sec" },
123: { TYPE_arch,"arch" },
1.1 kristaps 124: { ~0ULL, "any" },
125: { 0ULL, NULL }
126: };
127:
1.17 ! schwarze 128: static void buildnames(struct manpage *, sqlite3 *,
! 129: sqlite3_stmt *, uint64_t, const char *);
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))) {
1.17 ! schwarze 282: id = sqlite3_column_int64(s, 2);
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;
1.17 ! schwarze 292: mp->desc = mandoc_strdup
1.13 schwarze 293: ((char *)sqlite3_column_text(s, 0));
1.17 ! schwarze 294: mp->form = sqlite3_column_int(s, 1);
1.1 kristaps 295: ohash_insert(&htab, idx, mp);
296: }
297:
1.2 kristaps 298: if (SQLITE_DONE != c)
299: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
300:
1.1 kristaps 301: sqlite3_finalize(s);
1.10 schwarze 302:
303: c = sqlite3_prepare_v2(db,
304: "SELECT * FROM mlinks WHERE pageid=?",
305: -1, &s, NULL);
306: if (SQLITE_OK != c)
307: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
1.1 kristaps 308:
1.12 schwarze 309: c = sqlite3_prepare_v2(db,
310: "SELECT * FROM keys WHERE pageid=? AND bits & ?",
311: -1, &s2, NULL);
312: if (SQLITE_OK != c)
313: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
314:
1.1 kristaps 315: for (mp = ohash_first(&htab, &idx);
316: NULL != mp;
317: mp = ohash_next(&htab, &idx)) {
318: if (cur + 1 > maxres) {
319: maxres += 1024;
320: *res = mandoc_realloc
321: (*res, maxres * sizeof(struct manpage));
322: }
1.10 schwarze 323: mpage = *res + cur;
324: mpage->desc = mp->desc;
325: mpage->form = mp->form;
1.17 ! schwarze 326: buildnames(mpage, db, s, mp->id, paths->paths[i]);
1.12 schwarze 327: mpage->output = outbit ?
328: buildoutput(db, s2, mp->id, outbit) : NULL;
1.10 schwarze 329:
1.1 kristaps 330: free(mp);
331: cur++;
332: }
1.10 schwarze 333:
334: sqlite3_finalize(s);
1.12 schwarze 335: sqlite3_finalize(s2);
1.10 schwarze 336: sqlite3_close(db);
1.1 kristaps 337: ohash_delete(&htab);
338: }
1.2 kristaps 339: rc = 1;
1.1 kristaps 340: out:
341: exprfree(e);
342: if (-1 != fd)
343: close(fd);
344: free(sql);
345: *sz = cur;
1.2 kristaps 346: return(rc);
1.11 schwarze 347: }
348:
1.17 ! schwarze 349: static void
! 350: buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
! 351: uint64_t id, const char *path)
1.11 schwarze 352: {
1.17 ! schwarze 353: char *newnames;
1.11 schwarze 354: const char *oldnames, *sep1, *name, *sec, *sep2, *arch;
355: size_t i;
356: int c;
357:
1.17 ! schwarze 358: mpage->names = NULL;
1.11 schwarze 359: i = 1;
360: SQL_BIND_INT64(db, s, i, id);
361: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.17 ! schwarze 362:
! 363: /* Assemble the list of names. */
! 364:
! 365: if (NULL == mpage->names) {
1.11 schwarze 366: oldnames = "";
367: sep1 = "";
368: } else {
1.17 ! schwarze 369: oldnames = mpage->names;
1.11 schwarze 370: sep1 = ", ";
371: }
372: sec = sqlite3_column_text(s, 1);
373: arch = sqlite3_column_text(s, 2);
374: name = sqlite3_column_text(s, 3);
375: sep2 = '\0' == *arch ? "" : "/";
376: if (-1 == asprintf(&newnames, "%s%s%s(%s%s%s)",
377: oldnames, sep1, name, sec, sep2, arch)) {
378: perror(0);
379: exit((int)MANDOCLEVEL_SYSERR);
380: }
1.17 ! schwarze 381: free(mpage->names);
! 382: mpage->names = newnames;
! 383:
! 384: /* Also save the first file name encountered. */
! 385:
! 386: if (NULL != mpage->file)
! 387: continue;
! 388:
! 389: name = sqlite3_column_text(s, 0);
! 390: if (-1 == asprintf(&mpage->file, "%s/%s", path, name)) {
! 391: perror(0);
! 392: exit((int)MANDOCLEVEL_SYSERR);
! 393: }
1.11 schwarze 394: }
395: if (SQLITE_DONE != c)
396: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
397: sqlite3_reset(s);
1.12 schwarze 398: }
399:
400: static char *
401: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
402: {
403: char *output, *newoutput;
404: const char *oldoutput, *sep1, *data;
405: size_t i;
406: int c;
407:
408: output = NULL;
409: i = 1;
410: SQL_BIND_INT64(db, s, i, id);
411: SQL_BIND_INT64(db, s, i, outbit);
412: while (SQLITE_ROW == (c = sqlite3_step(s))) {
413: if (NULL == output) {
414: oldoutput = "";
415: sep1 = "";
416: } else {
417: oldoutput = output;
418: sep1 = " # ";
419: }
420: data = sqlite3_column_text(s, 1);
421: if (-1 == asprintf(&newoutput, "%s%s%s",
422: oldoutput, sep1, data)) {
423: perror(0);
424: exit((int)MANDOCLEVEL_SYSERR);
425: }
426: free(output);
427: output = newoutput;
428: }
429: if (SQLITE_DONE != c)
430: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
431: sqlite3_reset(s);
432: return(output);
1.1 kristaps 433: }
434:
435: /*
1.7 schwarze 436: * Implement substring match as an application-defined SQL function.
437: * Using the SQL LIKE or GLOB operators instead would be a bad idea
438: * because that would require escaping metacharacters in the string
439: * being searched for.
440: */
441: static void
442: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
443: {
444:
445: assert(2 == argc);
446: sqlite3_result_int(context, NULL != strcasestr(
447: (const char *)sqlite3_value_text(argv[1]),
448: (const char *)sqlite3_value_text(argv[0])));
449: }
450:
451: /*
1.8 schwarze 452: * Implement regular expression match
453: * as an application-defined SQL function.
454: */
455: static void
456: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
457: {
458:
459: assert(2 == argc);
460: sqlite3_result_int(context, !regexec(
461: (regex_t *)sqlite3_value_blob(argv[0]),
462: (const char *)sqlite3_value_text(argv[1]),
463: 0, NULL, 0));
464: }
465:
1.13 schwarze 466: static void
467: sql_append(char **sql, size_t *sz, const char *newstr, int count)
468: {
469: size_t newsz;
470:
471: newsz = 1 < count ? (size_t)count : strlen(newstr);
472: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
473: if (1 < count)
474: memset(*sql + *sz, *newstr, (size_t)count);
475: else
476: memcpy(*sql + *sz, newstr, newsz);
477: *sz += newsz;
478: (*sql)[*sz] = '\0';
479: }
480:
1.8 schwarze 481: /*
1.1 kristaps 482: * Prepare the search SQL statement.
483: */
484: static char *
1.15 schwarze 485: sql_statement(const struct expr *e)
1.1 kristaps 486: {
487: char *sql;
488: size_t sz;
1.13 schwarze 489: int needop;
1.1 kristaps 490:
1.13 schwarze 491: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 kristaps 492: sz = strlen(sql);
1.2 kristaps 493:
1.13 schwarze 494: for (needop = 0; NULL != e; e = e->next) {
495: if (e->and)
496: sql_append(&sql, &sz, " AND ", 1);
497: else if (needop)
498: sql_append(&sql, &sz, " OR ", 1);
499: if (e->open)
500: sql_append(&sql, &sz, "(", e->open);
501: sql_append(&sql, &sz, NULL == e->substr ?
502: "id IN (SELECT pageid FROM keys "
503: "WHERE key REGEXP ? AND bits & ?)" :
504: "id IN (SELECT pageid FROM keys "
505: "WHERE key MATCH ? AND bits & ?)", 1);
506: if (e->close)
507: sql_append(&sql, &sz, ")", e->close);
508: needop = 1;
1.1 kristaps 509: }
510:
511: return(sql);
512: }
513:
514: /*
515: * Compile a set of string tokens into an expression.
516: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
517: * "(", "foo=bar", etc.).
518: */
519: static struct expr *
1.5 kristaps 520: exprcomp(const struct mansearch *search, int argc, char *argv[])
1.1 kristaps 521: {
1.13 schwarze 522: int i, toopen, logic, igncase, toclose;
1.1 kristaps 523: struct expr *first, *next, *cur;
524:
525: first = cur = NULL;
1.15 schwarze 526: logic = igncase = toclose = 0;
527: toopen = 1;
1.1 kristaps 528:
529: for (i = 0; i < argc; i++) {
1.13 schwarze 530: if (0 == strcmp("(", argv[i])) {
531: if (igncase)
532: goto fail;
533: toopen++;
534: toclose++;
535: continue;
536: } else if (0 == strcmp(")", argv[i])) {
537: if (toopen || logic || igncase || NULL == cur)
538: goto fail;
539: cur->close++;
540: if (0 > --toclose)
541: goto fail;
542: continue;
543: } else if (0 == strcmp("-a", argv[i])) {
544: if (toopen || logic || igncase || NULL == cur)
545: goto fail;
546: logic = 1;
547: continue;
548: } else if (0 == strcmp("-o", argv[i])) {
549: if (toopen || logic || igncase || NULL == cur)
550: goto fail;
551: logic = 2;
552: continue;
553: } else if (0 == strcmp("-i", argv[i])) {
554: if (igncase)
555: goto fail;
556: igncase = 1;
557: continue;
1.1 kristaps 558: }
1.13 schwarze 559: next = exprterm(search, argv[i], !igncase);
560: if (NULL == next)
561: goto fail;
562: next->open = toopen;
563: next->and = (1 == logic);
1.1 kristaps 564: if (NULL != first) {
565: cur->next = next;
566: cur = next;
567: } else
568: cur = first = next;
1.13 schwarze 569: toopen = logic = igncase = 0;
1.1 kristaps 570: }
1.15 schwarze 571: if (toopen || logic || igncase || toclose)
572: goto fail;
573:
574: cur->close++;
575: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
576: exprspec(cur, TYPE_sec, search->sec, "^%s$");
577:
578: return(first);
579:
1.13 schwarze 580: fail:
581: if (NULL != first)
582: exprfree(first);
583: return(NULL);
1.1 kristaps 584: }
585:
586: static struct expr *
1.15 schwarze 587: exprspec(struct expr *cur, uint64_t key, const char *value,
588: const char *format)
589: {
590: char errbuf[BUFSIZ];
591: char *cp;
592: int irc;
593:
594: if (NULL == value)
595: return(cur);
596:
597: if (-1 == asprintf(&cp, format, value)) {
598: perror(0);
599: exit((int)MANDOCLEVEL_SYSERR);
600: }
601: cur->next = mandoc_calloc(1, sizeof(struct expr));
602: cur = cur->next;
603: cur->and = 1;
604: cur->bits = key;
605: if (0 != (irc = regcomp(&cur->regexp, cp,
606: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
607: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
608: fprintf(stderr, "regcomp: %s\n", errbuf);
609: cur->substr = value;
610: }
611: free(cp);
612: return(cur);
613: }
614:
615: static struct expr *
1.8 schwarze 616: exprterm(const struct mansearch *search, char *buf, int cs)
1.1 kristaps 617: {
1.15 schwarze 618: char errbuf[BUFSIZ];
1.1 kristaps 619: struct expr *e;
620: char *key, *v;
621: size_t i;
1.15 schwarze 622: int irc;
1.1 kristaps 623:
624: if ('\0' == *buf)
625: return(NULL);
626:
627: e = mandoc_calloc(1, sizeof(struct expr));
628:
1.5 kristaps 629: /*"whatis" mode uses an opaque string and default fields. */
630:
631: if (MANSEARCH_WHATIS & search->flags) {
1.8 schwarze 632: e->substr = buf;
1.5 kristaps 633: e->bits = search->deftype;
634: return(e);
635: }
636:
1.1 kristaps 637: /*
638: * If no =~ is specified, search with equality over names and
639: * descriptions.
640: * If =~ begins the phrase, use name and description fields.
641: */
642:
643: if (NULL == (v = strpbrk(buf, "=~"))) {
1.8 schwarze 644: e->substr = buf;
1.5 kristaps 645: e->bits = search->deftype;
1.1 kristaps 646: return(e);
647: } else if (v == buf)
1.5 kristaps 648: e->bits = search->deftype;
1.1 kristaps 649:
1.8 schwarze 650: if ('~' == *v++) {
1.15 schwarze 651: if (0 != (irc = regcomp(&e->regexp, v,
652: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
653: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
654: fprintf(stderr, "regcomp: %s\n", errbuf);
1.8 schwarze 655: free(e);
656: return(NULL);
657: }
658: } else
659: e->substr = v;
660: v[-1] = '\0';
1.1 kristaps 661:
662: /*
663: * Parse out all possible fields.
664: * If the field doesn't resolve, bail.
665: */
666:
667: while (NULL != (key = strsep(&buf, ","))) {
668: if ('\0' == *key)
669: continue;
670: i = 0;
671: while (types[i].bits &&
672: strcasecmp(types[i].name, key))
673: i++;
674: if (0 == types[i].bits) {
675: free(e);
676: return(NULL);
677: }
678: e->bits |= types[i].bits;
679: }
680:
681: return(e);
682: }
683:
684: static void
685: exprfree(struct expr *p)
686: {
687: struct expr *pp;
688:
689: while (NULL != p) {
690: pp = p->next;
691: free(p);
692: p = pp;
693: }
694: }
695:
696: static void *
697: hash_halloc(size_t sz, void *arg)
698: {
699:
700: return(mandoc_calloc(sz, 1));
701: }
702:
703: static void *
704: hash_alloc(size_t sz, void *arg)
705: {
706:
707: return(mandoc_malloc(sz));
708: }
709:
710: static void
711: hash_free(void *p, size_t sz, void *arg)
712: {
713:
714: free(p);
715: }
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