Annotation of mandoc/mansearch.c, Revision 1.23
1.23 ! schwarze 1: /* $Id: mansearch.c,v 1.22 2014/03/17 16:31:44 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"
1.23 ! schwarze 42: #include "mandoc_aux.h"
1.1 kristaps 43: #include "manpath.h"
44: #include "mansearch.h"
45:
1.20 schwarze 46: extern int mansearch_keymax;
47: extern const char *const mansearch_keynames[];
48:
1.3 kristaps 49: #define SQL_BIND_TEXT(_db, _s, _i, _v) \
1.8 schwarze 50: do { if (SQLITE_OK != sqlite3_bind_text \
1.2 kristaps 51: ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
1.8 schwarze 52: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
53: } while (0)
1.3 kristaps 54: #define SQL_BIND_INT64(_db, _s, _i, _v) \
1.8 schwarze 55: do { if (SQLITE_OK != sqlite3_bind_int64 \
1.2 kristaps 56: ((_s), (_i)++, (_v))) \
1.8 schwarze 57: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
58: } while (0)
59: #define SQL_BIND_BLOB(_db, _s, _i, _v) \
60: do { if (SQLITE_OK != sqlite3_bind_blob \
61: ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
62: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
63: } while (0)
1.2 kristaps 64:
1.1 kristaps 65: struct expr {
1.8 schwarze 66: uint64_t bits; /* type-mask */
67: const char *substr; /* to search for, if applicable */
68: regex_t regexp; /* compiled regexp, if applicable */
1.13 schwarze 69: int open; /* opening parentheses before */
70: int and; /* logical AND before */
71: int close; /* closing parentheses after */
1.8 schwarze 72: struct expr *next; /* next in sequence */
1.1 kristaps 73: };
74:
75: struct match {
76: uint64_t id; /* identifier in database */
77: int form; /* 0 == catpage */
78: };
79:
1.17 schwarze 80: static void buildnames(struct manpage *, sqlite3 *,
1.19 schwarze 81: sqlite3_stmt *, uint64_t,
82: const char *, int form);
1.12 schwarze 83: static char *buildoutput(sqlite3 *, sqlite3_stmt *,
84: uint64_t, uint64_t);
1.1 kristaps 85: static void *hash_alloc(size_t, void *);
86: static void hash_free(void *, size_t, void *);
87: static void *hash_halloc(size_t, void *);
1.5 kristaps 88: static struct expr *exprcomp(const struct mansearch *,
89: int, char *[]);
1.1 kristaps 90: static void exprfree(struct expr *);
1.15 schwarze 91: static struct expr *exprspec(struct expr *, uint64_t,
92: const char *, const char *);
1.8 schwarze 93: static struct expr *exprterm(const struct mansearch *, char *, int);
1.13 schwarze 94: static void sql_append(char **sql, size_t *sz,
95: const char *newstr, int count);
1.7 schwarze 96: static void sql_match(sqlite3_context *context,
97: int argc, sqlite3_value **argv);
1.8 schwarze 98: static void sql_regexp(sqlite3_context *context,
99: int argc, sqlite3_value **argv);
1.15 schwarze 100: static char *sql_statement(const struct expr *);
1.1 kristaps 101:
102: int
1.5 kristaps 103: mansearch(const struct mansearch *search,
1.12 schwarze 104: const struct manpaths *paths,
105: int argc, char *argv[],
106: const char *outkey,
1.1 kristaps 107: struct manpage **res, size_t *sz)
108: {
1.20 schwarze 109: int fd, rc, c, indexbit;
1.1 kristaps 110: int64_t id;
1.20 schwarze 111: uint64_t outbit, iterbit;
1.6 schwarze 112: char buf[PATH_MAX];
1.11 schwarze 113: char *sql;
1.10 schwarze 114: struct manpage *mpage;
1.1 kristaps 115: struct expr *e, *ep;
116: sqlite3 *db;
1.12 schwarze 117: sqlite3_stmt *s, *s2;
1.1 kristaps 118: struct match *mp;
119: struct ohash_info info;
120: struct ohash htab;
121: unsigned int idx;
122: size_t i, j, cur, maxres;
123:
124: memset(&info, 0, sizeof(struct ohash_info));
125:
126: info.halloc = hash_halloc;
127: info.alloc = hash_alloc;
128: info.hfree = hash_free;
129: info.key_offset = offsetof(struct match, id);
130:
1.2 kristaps 131: *sz = cur = maxres = 0;
1.1 kristaps 132: sql = NULL;
133: *res = NULL;
134: fd = -1;
135: e = NULL;
1.2 kristaps 136: rc = 0;
1.1 kristaps 137:
138: if (0 == argc)
139: goto out;
1.5 kristaps 140: if (NULL == (e = exprcomp(search, argc, argv)))
1.1 kristaps 141: goto out;
142:
1.12 schwarze 143: outbit = 0;
144: if (NULL != outkey) {
1.20 schwarze 145: for (indexbit = 0, iterbit = 1;
146: indexbit < mansearch_keymax;
147: indexbit++, iterbit <<= 1) {
148: if (0 == strcasecmp(outkey,
149: mansearch_keynames[indexbit])) {
150: outbit = iterbit;
1.12 schwarze 151: break;
152: }
153: }
154: }
155:
1.1 kristaps 156: /*
157: * Save a descriptor to the current working directory.
158: * Since pathnames in the "paths" variable might be relative,
159: * and we'll be chdir()ing into them, we need to keep a handle
160: * on our current directory from which to start the chdir().
161: */
162:
1.6 schwarze 163: if (NULL == getcwd(buf, PATH_MAX)) {
1.1 kristaps 164: perror(NULL);
165: goto out;
166: } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
167: perror(buf);
168: goto out;
169: }
170:
1.15 schwarze 171: sql = sql_statement(e);
1.1 kristaps 172:
173: /*
174: * Loop over the directories (containing databases) for us to
175: * search.
176: * Don't let missing/bad databases/directories phase us.
177: * In each, try to open the resident database and, if it opens,
178: * scan it for our match expression.
179: */
180:
181: for (i = 0; i < paths->sz; i++) {
182: if (-1 == fchdir(fd)) {
183: perror(buf);
184: free(*res);
185: break;
186: } else if (-1 == chdir(paths->paths[i])) {
187: perror(paths->paths[i]);
188: continue;
189: }
190:
1.2 kristaps 191: c = sqlite3_open_v2
192: (MANDOC_DB, &db,
193: SQLITE_OPEN_READONLY, NULL);
1.1 kristaps 194:
1.2 kristaps 195: if (SQLITE_OK != c) {
1.1 kristaps 196: perror(MANDOC_DB);
197: sqlite3_close(db);
198: continue;
199: }
200:
1.8 schwarze 201: /*
202: * Define the SQL functions for substring
203: * and regular expression matching.
204: */
1.7 schwarze 205:
206: c = sqlite3_create_function(db, "match", 2,
207: SQLITE_ANY, NULL, sql_match, NULL, NULL);
1.8 schwarze 208: assert(SQLITE_OK == c);
209: c = sqlite3_create_function(db, "regexp", 2,
210: SQLITE_ANY, NULL, sql_regexp, NULL, NULL);
211: assert(SQLITE_OK == c);
1.7 schwarze 212:
1.1 kristaps 213: j = 1;
1.2 kristaps 214: c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
215: if (SQLITE_OK != c)
216: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
1.1 kristaps 217:
218: for (ep = e; NULL != ep; ep = ep->next) {
1.8 schwarze 219: if (NULL == ep->substr) {
220: SQL_BIND_BLOB(db, s, j, ep->regexp);
221: } else
222: SQL_BIND_TEXT(db, s, j, ep->substr);
1.3 kristaps 223: SQL_BIND_INT64(db, s, j, ep->bits);
1.1 kristaps 224: }
225:
226: memset(&htab, 0, sizeof(struct ohash));
227: ohash_init(&htab, 4, &info);
228:
229: /*
230: * Hash each entry on its [unique] document identifier.
231: * This is a uint64_t.
232: * Instead of using a hash function, simply convert the
233: * uint64_t to a uint32_t, the hash value's type.
234: * This gives good performance and preserves the
235: * distribution of buckets in the table.
236: */
1.2 kristaps 237: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.18 schwarze 238: id = sqlite3_column_int64(s, 1);
1.1 kristaps 239: idx = ohash_lookup_memory
240: (&htab, (char *)&id,
241: sizeof(uint64_t), (uint32_t)id);
242:
243: if (NULL != ohash_find(&htab, idx))
244: continue;
245:
246: mp = mandoc_calloc(1, sizeof(struct match));
247: mp->id = id;
1.18 schwarze 248: mp->form = sqlite3_column_int(s, 0);
1.1 kristaps 249: ohash_insert(&htab, idx, mp);
250: }
251:
1.2 kristaps 252: if (SQLITE_DONE != c)
253: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
254:
1.1 kristaps 255: sqlite3_finalize(s);
1.10 schwarze 256:
257: c = sqlite3_prepare_v2(db,
1.22 schwarze 258: "SELECT * FROM mlinks WHERE pageid=?"
259: " ORDER BY sec, arch, name",
1.10 schwarze 260: -1, &s, NULL);
261: if (SQLITE_OK != c)
262: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
1.1 kristaps 263:
1.12 schwarze 264: c = sqlite3_prepare_v2(db,
265: "SELECT * FROM keys WHERE pageid=? AND bits & ?",
266: -1, &s2, NULL);
267: if (SQLITE_OK != c)
268: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
269:
1.1 kristaps 270: for (mp = ohash_first(&htab, &idx);
271: NULL != mp;
272: mp = ohash_next(&htab, &idx)) {
273: if (cur + 1 > maxres) {
274: maxres += 1024;
275: *res = mandoc_realloc
276: (*res, maxres * sizeof(struct manpage));
277: }
1.10 schwarze 278: mpage = *res + cur;
279: mpage->form = mp->form;
1.19 schwarze 280: buildnames(mpage, db, s, mp->id,
281: paths->paths[i], mp->form);
1.12 schwarze 282: mpage->output = outbit ?
283: buildoutput(db, s2, mp->id, outbit) : NULL;
1.10 schwarze 284:
1.1 kristaps 285: free(mp);
286: cur++;
287: }
1.10 schwarze 288:
289: sqlite3_finalize(s);
1.12 schwarze 290: sqlite3_finalize(s2);
1.10 schwarze 291: sqlite3_close(db);
1.1 kristaps 292: ohash_delete(&htab);
293: }
1.2 kristaps 294: rc = 1;
1.1 kristaps 295: out:
296: exprfree(e);
297: if (-1 != fd)
298: close(fd);
299: free(sql);
300: *sz = cur;
1.2 kristaps 301: return(rc);
1.11 schwarze 302: }
303:
1.17 schwarze 304: static void
305: buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
1.19 schwarze 306: uint64_t id, const char *path, int form)
1.11 schwarze 307: {
1.22 schwarze 308: char *newnames, *prevsec, *prevarch;
1.19 schwarze 309: const char *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
1.11 schwarze 310: size_t i;
311: int c;
312:
1.17 schwarze 313: mpage->names = NULL;
1.22 schwarze 314: prevsec = prevarch = NULL;
1.11 schwarze 315: i = 1;
316: SQL_BIND_INT64(db, s, i, id);
317: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.17 schwarze 318:
1.22 schwarze 319: /* Decide whether we already have some names. */
1.17 schwarze 320:
321: if (NULL == mpage->names) {
1.11 schwarze 322: oldnames = "";
323: sep1 = "";
324: } else {
1.17 schwarze 325: oldnames = mpage->names;
1.11 schwarze 326: sep1 = ", ";
327: }
1.22 schwarze 328:
329: /* Fetch the next name. */
330:
1.19 schwarze 331: sec = sqlite3_column_text(s, 0);
332: arch = sqlite3_column_text(s, 1);
333: name = sqlite3_column_text(s, 2);
1.22 schwarze 334:
335: /* If the section changed, append the old one. */
336:
337: if (NULL != prevsec &&
338: (strcmp(sec, prevsec) ||
339: strcmp(arch, prevarch))) {
340: sep2 = '\0' == *prevarch ? "" : "/";
341: if (-1 == asprintf(&newnames, "%s(%s%s%s)",
342: oldnames, prevsec, sep2, prevarch)) {
343: perror(0);
344: exit((int)MANDOCLEVEL_SYSERR);
345: }
346: free(mpage->names);
347: oldnames = mpage->names = newnames;
348: free(prevsec);
349: free(prevarch);
350: prevsec = prevarch = NULL;
351: }
352:
353: /* Save the new section, to append it later. */
354:
355: if (NULL == prevsec) {
356: prevsec = mandoc_strdup(sec);
357: prevarch = mandoc_strdup(arch);
358: }
359:
360: /* Append the new name. */
361:
362: if (-1 == asprintf(&newnames, "%s%s%s",
363: oldnames, sep1, name)) {
1.11 schwarze 364: perror(0);
365: exit((int)MANDOCLEVEL_SYSERR);
366: }
1.17 schwarze 367: free(mpage->names);
368: mpage->names = newnames;
369:
370: /* Also save the first file name encountered. */
371:
372: if (NULL != mpage->file)
373: continue;
374:
1.19 schwarze 375: if (form) {
376: sep1 = "man";
377: fsec = sec;
378: } else {
379: sep1 = "cat";
380: fsec = "0";
381: }
1.22 schwarze 382: sep2 = '\0' == *arch ? "" : "/";
1.19 schwarze 383: if (-1 == asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
384: path, sep1, sec, sep2, arch, name, fsec)) {
1.17 schwarze 385: perror(0);
386: exit((int)MANDOCLEVEL_SYSERR);
387: }
1.11 schwarze 388: }
389: if (SQLITE_DONE != c)
390: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
391: sqlite3_reset(s);
1.22 schwarze 392:
393: /* Append one final section to the names. */
394:
395: if (NULL != prevsec) {
396: sep2 = '\0' == *prevarch ? "" : "/";
397: if (-1 == asprintf(&newnames, "%s(%s%s%s)",
398: mpage->names, prevsec, sep2, prevarch)) {
399: perror(0);
400: exit((int)MANDOCLEVEL_SYSERR);
401: }
402: free(mpage->names);
403: mpage->names = newnames;
404: free(prevsec);
405: free(prevarch);
406: }
1.12 schwarze 407: }
408:
409: static char *
410: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
411: {
412: char *output, *newoutput;
413: const char *oldoutput, *sep1, *data;
414: size_t i;
415: int c;
416:
417: output = NULL;
418: i = 1;
419: SQL_BIND_INT64(db, s, i, id);
420: SQL_BIND_INT64(db, s, i, outbit);
421: while (SQLITE_ROW == (c = sqlite3_step(s))) {
422: if (NULL == output) {
423: oldoutput = "";
424: sep1 = "";
425: } else {
426: oldoutput = output;
427: sep1 = " # ";
428: }
429: data = sqlite3_column_text(s, 1);
430: if (-1 == asprintf(&newoutput, "%s%s%s",
431: oldoutput, sep1, data)) {
432: perror(0);
433: exit((int)MANDOCLEVEL_SYSERR);
434: }
435: free(output);
436: output = newoutput;
437: }
438: if (SQLITE_DONE != c)
439: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
440: sqlite3_reset(s);
441: return(output);
1.1 kristaps 442: }
443:
444: /*
1.7 schwarze 445: * Implement substring match as an application-defined SQL function.
446: * Using the SQL LIKE or GLOB operators instead would be a bad idea
447: * because that would require escaping metacharacters in the string
448: * being searched for.
449: */
450: static void
451: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
452: {
453:
454: assert(2 == argc);
455: sqlite3_result_int(context, NULL != strcasestr(
456: (const char *)sqlite3_value_text(argv[1]),
457: (const char *)sqlite3_value_text(argv[0])));
458: }
459:
460: /*
1.8 schwarze 461: * Implement regular expression match
462: * as an application-defined SQL function.
463: */
464: static void
465: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
466: {
467:
468: assert(2 == argc);
469: sqlite3_result_int(context, !regexec(
470: (regex_t *)sqlite3_value_blob(argv[0]),
471: (const char *)sqlite3_value_text(argv[1]),
472: 0, NULL, 0));
473: }
474:
1.13 schwarze 475: static void
476: sql_append(char **sql, size_t *sz, const char *newstr, int count)
477: {
478: size_t newsz;
479:
480: newsz = 1 < count ? (size_t)count : strlen(newstr);
481: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
482: if (1 < count)
483: memset(*sql + *sz, *newstr, (size_t)count);
484: else
485: memcpy(*sql + *sz, newstr, newsz);
486: *sz += newsz;
487: (*sql)[*sz] = '\0';
488: }
489:
1.8 schwarze 490: /*
1.1 kristaps 491: * Prepare the search SQL statement.
492: */
493: static char *
1.15 schwarze 494: sql_statement(const struct expr *e)
1.1 kristaps 495: {
496: char *sql;
497: size_t sz;
1.13 schwarze 498: int needop;
1.1 kristaps 499:
1.13 schwarze 500: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 kristaps 501: sz = strlen(sql);
1.2 kristaps 502:
1.13 schwarze 503: for (needop = 0; NULL != e; e = e->next) {
504: if (e->and)
505: sql_append(&sql, &sz, " AND ", 1);
506: else if (needop)
507: sql_append(&sql, &sz, " OR ", 1);
508: if (e->open)
509: sql_append(&sql, &sz, "(", e->open);
510: sql_append(&sql, &sz, NULL == e->substr ?
511: "id IN (SELECT pageid FROM keys "
512: "WHERE key REGEXP ? AND bits & ?)" :
513: "id IN (SELECT pageid FROM keys "
514: "WHERE key MATCH ? AND bits & ?)", 1);
515: if (e->close)
516: sql_append(&sql, &sz, ")", e->close);
517: needop = 1;
1.1 kristaps 518: }
519:
520: return(sql);
521: }
522:
523: /*
524: * Compile a set of string tokens into an expression.
525: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
526: * "(", "foo=bar", etc.).
527: */
528: static struct expr *
1.5 kristaps 529: exprcomp(const struct mansearch *search, int argc, char *argv[])
1.1 kristaps 530: {
1.13 schwarze 531: int i, toopen, logic, igncase, toclose;
1.1 kristaps 532: struct expr *first, *next, *cur;
533:
534: first = cur = NULL;
1.15 schwarze 535: logic = igncase = toclose = 0;
536: toopen = 1;
1.1 kristaps 537:
538: for (i = 0; i < argc; i++) {
1.13 schwarze 539: if (0 == strcmp("(", argv[i])) {
540: if (igncase)
541: goto fail;
542: toopen++;
543: toclose++;
544: continue;
545: } else if (0 == strcmp(")", argv[i])) {
546: if (toopen || logic || igncase || NULL == cur)
547: goto fail;
548: cur->close++;
549: if (0 > --toclose)
550: goto fail;
551: continue;
552: } else if (0 == strcmp("-a", argv[i])) {
553: if (toopen || logic || igncase || NULL == cur)
554: goto fail;
555: logic = 1;
556: continue;
557: } else if (0 == strcmp("-o", argv[i])) {
558: if (toopen || logic || igncase || NULL == cur)
559: goto fail;
560: logic = 2;
561: continue;
562: } else if (0 == strcmp("-i", argv[i])) {
563: if (igncase)
564: goto fail;
565: igncase = 1;
566: continue;
1.1 kristaps 567: }
1.13 schwarze 568: next = exprterm(search, argv[i], !igncase);
569: if (NULL == next)
570: goto fail;
571: next->open = toopen;
572: next->and = (1 == logic);
1.1 kristaps 573: if (NULL != first) {
574: cur->next = next;
575: cur = next;
576: } else
577: cur = first = next;
1.13 schwarze 578: toopen = logic = igncase = 0;
1.1 kristaps 579: }
1.15 schwarze 580: if (toopen || logic || igncase || toclose)
581: goto fail;
582:
583: cur->close++;
584: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
585: exprspec(cur, TYPE_sec, search->sec, "^%s$");
586:
587: return(first);
588:
1.13 schwarze 589: fail:
590: if (NULL != first)
591: exprfree(first);
592: return(NULL);
1.1 kristaps 593: }
594:
595: static struct expr *
1.15 schwarze 596: exprspec(struct expr *cur, uint64_t key, const char *value,
597: const char *format)
598: {
599: char errbuf[BUFSIZ];
600: char *cp;
601: int irc;
602:
603: if (NULL == value)
604: return(cur);
605:
606: if (-1 == asprintf(&cp, format, value)) {
607: perror(0);
608: exit((int)MANDOCLEVEL_SYSERR);
609: }
610: cur->next = mandoc_calloc(1, sizeof(struct expr));
611: cur = cur->next;
612: cur->and = 1;
613: cur->bits = key;
614: if (0 != (irc = regcomp(&cur->regexp, cp,
615: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
616: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
617: fprintf(stderr, "regcomp: %s\n", errbuf);
618: cur->substr = value;
619: }
620: free(cp);
621: return(cur);
622: }
623:
624: static struct expr *
1.8 schwarze 625: exprterm(const struct mansearch *search, char *buf, int cs)
1.1 kristaps 626: {
1.15 schwarze 627: char errbuf[BUFSIZ];
1.1 kristaps 628: struct expr *e;
629: char *key, *v;
1.20 schwarze 630: uint64_t iterbit;
631: int i, irc;
1.1 kristaps 632:
633: if ('\0' == *buf)
634: return(NULL);
635:
636: e = mandoc_calloc(1, sizeof(struct expr));
637:
1.5 kristaps 638: /*"whatis" mode uses an opaque string and default fields. */
639:
640: if (MANSEARCH_WHATIS & search->flags) {
1.8 schwarze 641: e->substr = buf;
1.5 kristaps 642: e->bits = search->deftype;
643: return(e);
644: }
645:
1.1 kristaps 646: /*
647: * If no =~ is specified, search with equality over names and
648: * descriptions.
649: * If =~ begins the phrase, use name and description fields.
650: */
651:
652: if (NULL == (v = strpbrk(buf, "=~"))) {
1.8 schwarze 653: e->substr = buf;
1.5 kristaps 654: e->bits = search->deftype;
1.1 kristaps 655: return(e);
656: } else if (v == buf)
1.5 kristaps 657: e->bits = search->deftype;
1.1 kristaps 658:
1.8 schwarze 659: if ('~' == *v++) {
1.21 schwarze 660: if (NULL != strstr(buf, "arch"))
661: cs = 0;
1.15 schwarze 662: if (0 != (irc = regcomp(&e->regexp, v,
663: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
664: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
665: fprintf(stderr, "regcomp: %s\n", errbuf);
1.8 schwarze 666: free(e);
667: return(NULL);
668: }
669: } else
670: e->substr = v;
671: v[-1] = '\0';
1.1 kristaps 672:
673: /*
674: * Parse out all possible fields.
675: * If the field doesn't resolve, bail.
676: */
677:
678: while (NULL != (key = strsep(&buf, ","))) {
679: if ('\0' == *key)
680: continue;
1.20 schwarze 681: for (i = 0, iterbit = 1;
682: i < mansearch_keymax;
683: i++, iterbit <<= 1) {
684: if (0 == strcasecmp(key,
685: mansearch_keynames[i])) {
686: e->bits |= iterbit;
687: break;
688: }
689: }
690: if (i == mansearch_keymax) {
691: if (strcasecmp(key, "any")) {
692: free(e);
693: return(NULL);
694: }
695: e->bits |= ~0ULL;
1.1 kristaps 696: }
697: }
698:
699: return(e);
700: }
701:
702: static void
703: exprfree(struct expr *p)
704: {
705: struct expr *pp;
706:
707: while (NULL != p) {
708: pp = p->next;
709: free(p);
710: p = pp;
711: }
712: }
713:
714: static void *
715: hash_halloc(size_t sz, void *arg)
716: {
717:
718: return(mandoc_calloc(sz, 1));
719: }
720:
721: static void *
722: hash_alloc(size_t sz, void *arg)
723: {
724:
725: return(mandoc_malloc(sz));
726: }
727:
728: static void
729: hash_free(void *p, size_t sz, void *arg)
730: {
731:
732: free(p);
733: }
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