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1.20 ! schwarze 1: /* $Id: mansearch.c,v 1.19 2014/04/11 15:45:39 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: */
1.19 schwarze 18: #include <sys/mman.h>
1.1 schwarze 19: #include <assert.h>
20: #include <fcntl.h>
21: #include <getopt.h>
22: #include <limits.h>
23: #include <regex.h>
24: #include <stdio.h>
25: #include <stdint.h>
26: #include <stddef.h>
27: #include <stdlib.h>
28: #include <string.h>
29: #include <unistd.h>
30:
31: #include <ohash.h>
32: #include <sqlite3.h>
33:
34: #include "mandoc.h"
1.14 schwarze 35: #include "mandoc_aux.h"
1.1 schwarze 36: #include "manpath.h"
37: #include "mansearch.h"
38:
1.11 schwarze 39: extern int mansearch_keymax;
40: extern const char *const mansearch_keynames[];
41:
1.1 schwarze 42: #define SQL_BIND_TEXT(_db, _s, _i, _v) \
43: do { if (SQLITE_OK != sqlite3_bind_text \
44: ((_s), (_i)++, (_v), -1, SQLITE_STATIC)) \
45: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
46: } while (0)
47: #define SQL_BIND_INT64(_db, _s, _i, _v) \
48: do { if (SQLITE_OK != sqlite3_bind_int64 \
49: ((_s), (_i)++, (_v))) \
50: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
51: } while (0)
52: #define SQL_BIND_BLOB(_db, _s, _i, _v) \
53: do { if (SQLITE_OK != sqlite3_bind_blob \
54: ((_s), (_i)++, (&_v), sizeof(_v), SQLITE_STATIC)) \
55: fprintf(stderr, "%s\n", sqlite3_errmsg((_db))); \
56: } while (0)
57:
58: struct expr {
59: uint64_t bits; /* type-mask */
60: const char *substr; /* to search for, if applicable */
61: regex_t regexp; /* compiled regexp, if applicable */
1.4 schwarze 62: int open; /* opening parentheses before */
63: int and; /* logical AND before */
64: int close; /* closing parentheses after */
1.1 schwarze 65: struct expr *next; /* next in sequence */
66: };
67:
68: struct match {
69: uint64_t id; /* identifier in database */
1.17 schwarze 70: char *desc; /* manual page description */
1.1 schwarze 71: int form; /* 0 == catpage */
72: };
73:
1.8 schwarze 74: static void buildnames(struct manpage *, sqlite3 *,
1.10 schwarze 75: sqlite3_stmt *, uint64_t,
76: const char *, int form);
1.3 schwarze 77: static char *buildoutput(sqlite3 *, sqlite3_stmt *,
78: uint64_t, uint64_t);
1.1 schwarze 79: static void *hash_alloc(size_t, void *);
80: static void hash_free(void *, size_t, void *);
81: static void *hash_halloc(size_t, void *);
82: static struct expr *exprcomp(const struct mansearch *,
83: int, char *[]);
84: static void exprfree(struct expr *);
1.6 schwarze 85: static struct expr *exprspec(struct expr *, uint64_t,
86: const char *, const char *);
1.1 schwarze 87: static struct expr *exprterm(const struct mansearch *, char *, int);
1.4 schwarze 88: static void sql_append(char **sql, size_t *sz,
89: const char *newstr, int count);
1.1 schwarze 90: static void sql_match(sqlite3_context *context,
91: int argc, sqlite3_value **argv);
92: static void sql_regexp(sqlite3_context *context,
93: int argc, sqlite3_value **argv);
1.6 schwarze 94: static char *sql_statement(const struct expr *);
1.19 schwarze 95:
96: int
97: mansearch_setup(int start)
98: {
99: static void *pagecache;
100: int c;
101:
102: #define PC_PAGESIZE 1280
103: #define PC_NUMPAGES 256
104:
105: if (start) {
106: if (NULL != pagecache) {
107: fprintf(stderr, "pagecache already enabled\n");
108: return((int)MANDOCLEVEL_BADARG);
109: }
110:
111: pagecache = mmap(NULL, PC_PAGESIZE * PC_NUMPAGES,
112: PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
113:
114: if (MAP_FAILED == pagecache) {
115: perror("mmap");
116: pagecache = NULL;
117: return((int)MANDOCLEVEL_SYSERR);
118: }
119:
120: c = sqlite3_config(SQLITE_CONFIG_PAGECACHE,
121: pagecache, PC_PAGESIZE, PC_NUMPAGES);
122:
123: if (SQLITE_OK == c)
124: return((int)MANDOCLEVEL_OK);
125:
126: fprintf(stderr, "pagecache: %s\n", sqlite3_errstr(c));
127:
128: } else if (NULL == pagecache) {
129: fprintf(stderr, "pagecache missing\n");
130: return((int)MANDOCLEVEL_BADARG);
131: }
132:
133: if (-1 == munmap(pagecache, PC_PAGESIZE * PC_NUMPAGES)) {
134: perror("munmap");
135: pagecache = NULL;
136: return((int)MANDOCLEVEL_SYSERR);
137: }
138:
139: pagecache = NULL;
140: return((int)MANDOCLEVEL_OK);
141: }
1.1 schwarze 142:
143: int
144: mansearch(const struct mansearch *search,
1.3 schwarze 145: const struct manpaths *paths,
146: int argc, char *argv[],
147: const char *outkey,
1.1 schwarze 148: struct manpage **res, size_t *sz)
149: {
1.11 schwarze 150: int fd, rc, c, indexbit;
1.1 schwarze 151: int64_t id;
1.11 schwarze 152: uint64_t outbit, iterbit;
1.1 schwarze 153: char buf[PATH_MAX];
1.2 schwarze 154: char *sql;
1.1 schwarze 155: struct manpage *mpage;
156: struct expr *e, *ep;
157: sqlite3 *db;
1.3 schwarze 158: sqlite3_stmt *s, *s2;
1.1 schwarze 159: struct match *mp;
160: struct ohash_info info;
161: struct ohash htab;
162: unsigned int idx;
163: size_t i, j, cur, maxres;
164:
165: memset(&info, 0, sizeof(struct ohash_info));
166:
167: info.halloc = hash_halloc;
168: info.alloc = hash_alloc;
169: info.hfree = hash_free;
170: info.key_offset = offsetof(struct match, id);
171:
172: *sz = cur = maxres = 0;
173: sql = NULL;
174: *res = NULL;
175: fd = -1;
176: e = NULL;
177: rc = 0;
178:
179: if (0 == argc)
180: goto out;
181: if (NULL == (e = exprcomp(search, argc, argv)))
182: goto out;
183:
1.3 schwarze 184: outbit = 0;
185: if (NULL != outkey) {
1.11 schwarze 186: for (indexbit = 0, iterbit = 1;
187: indexbit < mansearch_keymax;
188: indexbit++, iterbit <<= 1) {
189: if (0 == strcasecmp(outkey,
190: mansearch_keynames[indexbit])) {
191: outbit = iterbit;
1.3 schwarze 192: break;
193: }
194: }
195: }
196:
1.1 schwarze 197: /*
198: * Save a descriptor to the current working directory.
199: * Since pathnames in the "paths" variable might be relative,
200: * and we'll be chdir()ing into them, we need to keep a handle
201: * on our current directory from which to start the chdir().
202: */
203:
204: if (NULL == getcwd(buf, PATH_MAX)) {
1.20 ! schwarze 205: perror("getcwd");
1.1 schwarze 206: goto out;
207: } else if (-1 == (fd = open(buf, O_RDONLY, 0))) {
208: perror(buf);
209: goto out;
210: }
211:
1.6 schwarze 212: sql = sql_statement(e);
1.1 schwarze 213:
214: /*
215: * Loop over the directories (containing databases) for us to
216: * search.
217: * Don't let missing/bad databases/directories phase us.
218: * In each, try to open the resident database and, if it opens,
219: * scan it for our match expression.
220: */
221:
222: for (i = 0; i < paths->sz; i++) {
223: if (-1 == fchdir(fd)) {
224: perror(buf);
225: free(*res);
226: break;
227: } else if (-1 == chdir(paths->paths[i])) {
228: perror(paths->paths[i]);
229: continue;
230: }
231:
232: c = sqlite3_open_v2
233: (MANDOC_DB, &db,
234: SQLITE_OPEN_READONLY, NULL);
235:
236: if (SQLITE_OK != c) {
237: perror(MANDOC_DB);
238: sqlite3_close(db);
239: continue;
240: }
241:
242: /*
243: * Define the SQL functions for substring
244: * and regular expression matching.
245: */
246:
247: c = sqlite3_create_function(db, "match", 2,
248: SQLITE_ANY, NULL, sql_match, NULL, NULL);
249: assert(SQLITE_OK == c);
250: c = sqlite3_create_function(db, "regexp", 2,
251: SQLITE_ANY, NULL, sql_regexp, NULL, NULL);
252: assert(SQLITE_OK == c);
253:
254: j = 1;
255: c = sqlite3_prepare_v2(db, sql, -1, &s, NULL);
256: if (SQLITE_OK != c)
257: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
258:
259: for (ep = e; NULL != ep; ep = ep->next) {
260: if (NULL == ep->substr) {
261: SQL_BIND_BLOB(db, s, j, ep->regexp);
262: } else
263: SQL_BIND_TEXT(db, s, j, ep->substr);
1.18 schwarze 264: if (0 == ((TYPE_Nd | TYPE_Nm) & ep->bits))
1.17 schwarze 265: SQL_BIND_INT64(db, s, j, ep->bits);
1.1 schwarze 266: }
267:
268: memset(&htab, 0, sizeof(struct ohash));
269: ohash_init(&htab, 4, &info);
270:
271: /*
272: * Hash each entry on its [unique] document identifier.
273: * This is a uint64_t.
274: * Instead of using a hash function, simply convert the
275: * uint64_t to a uint32_t, the hash value's type.
276: * This gives good performance and preserves the
277: * distribution of buckets in the table.
278: */
279: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.17 schwarze 280: id = sqlite3_column_int64(s, 2);
1.1 schwarze 281: idx = ohash_lookup_memory
1.17 schwarze 282: (&htab, (char *)&id,
1.1 schwarze 283: sizeof(uint64_t), (uint32_t)id);
284:
285: if (NULL != ohash_find(&htab, idx))
286: continue;
287:
288: mp = mandoc_calloc(1, sizeof(struct match));
289: mp->id = id;
1.17 schwarze 290: mp->form = sqlite3_column_int(s, 1);
291: if (TYPE_Nd == outbit)
292: mp->desc = mandoc_strdup(
293: sqlite3_column_text(s, 0));
1.1 schwarze 294: ohash_insert(&htab, idx, mp);
295: }
296:
297: if (SQLITE_DONE != c)
298: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
299:
300: sqlite3_finalize(s);
301:
302: c = sqlite3_prepare_v2(db,
1.13 schwarze 303: "SELECT * FROM mlinks WHERE pageid=?"
304: " ORDER BY sec, arch, name",
1.1 schwarze 305: -1, &s, NULL);
306: if (SQLITE_OK != c)
307: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
308:
1.3 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 schwarze 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: }
323: mpage = *res + cur;
324: mpage->form = mp->form;
1.10 schwarze 325: buildnames(mpage, db, s, mp->id,
326: paths->paths[i], mp->form);
1.17 schwarze 327: mpage->output = TYPE_Nd & outbit ?
328: mp->desc : outbit ?
1.3 schwarze 329: buildoutput(db, s2, mp->id, outbit) : NULL;
1.1 schwarze 330:
331: free(mp);
332: cur++;
333: }
334:
335: sqlite3_finalize(s);
1.3 schwarze 336: sqlite3_finalize(s2);
1.1 schwarze 337: sqlite3_close(db);
338: ohash_delete(&htab);
339: }
340: rc = 1;
341: out:
1.20 ! schwarze 342: if (-1 != fd) {
! 343: if (-1 == fchdir(fd))
! 344: perror(buf);
! 345: close(fd);
! 346: }
1.1 schwarze 347: exprfree(e);
348: free(sql);
349: *sz = cur;
350: return(rc);
1.2 schwarze 351: }
352:
1.8 schwarze 353: static void
354: buildnames(struct manpage *mpage, sqlite3 *db, sqlite3_stmt *s,
1.10 schwarze 355: uint64_t id, const char *path, int form)
1.2 schwarze 356: {
1.13 schwarze 357: char *newnames, *prevsec, *prevarch;
1.10 schwarze 358: const char *oldnames, *sep1, *name, *sec, *sep2, *arch, *fsec;
1.2 schwarze 359: size_t i;
360: int c;
361:
1.16 schwarze 362: mpage->file = NULL;
1.8 schwarze 363: mpage->names = NULL;
1.13 schwarze 364: prevsec = prevarch = NULL;
1.2 schwarze 365: i = 1;
366: SQL_BIND_INT64(db, s, i, id);
367: while (SQLITE_ROW == (c = sqlite3_step(s))) {
1.8 schwarze 368:
1.13 schwarze 369: /* Decide whether we already have some names. */
1.8 schwarze 370:
371: if (NULL == mpage->names) {
1.2 schwarze 372: oldnames = "";
373: sep1 = "";
374: } else {
1.8 schwarze 375: oldnames = mpage->names;
1.2 schwarze 376: sep1 = ", ";
377: }
1.13 schwarze 378:
379: /* Fetch the next name. */
380:
1.10 schwarze 381: sec = sqlite3_column_text(s, 0);
382: arch = sqlite3_column_text(s, 1);
383: name = sqlite3_column_text(s, 2);
1.13 schwarze 384:
385: /* If the section changed, append the old one. */
386:
387: if (NULL != prevsec &&
388: (strcmp(sec, prevsec) ||
389: strcmp(arch, prevarch))) {
390: sep2 = '\0' == *prevarch ? "" : "/";
1.15 schwarze 391: mandoc_asprintf(&newnames, "%s(%s%s%s)",
392: oldnames, prevsec, sep2, prevarch);
1.13 schwarze 393: free(mpage->names);
394: oldnames = mpage->names = newnames;
395: free(prevsec);
396: free(prevarch);
397: prevsec = prevarch = NULL;
398: }
399:
400: /* Save the new section, to append it later. */
401:
402: if (NULL == prevsec) {
403: prevsec = mandoc_strdup(sec);
404: prevarch = mandoc_strdup(arch);
405: }
406:
407: /* Append the new name. */
408:
1.15 schwarze 409: mandoc_asprintf(&newnames, "%s%s%s",
410: oldnames, sep1, name);
1.8 schwarze 411: free(mpage->names);
412: mpage->names = newnames;
413:
414: /* Also save the first file name encountered. */
415:
416: if (NULL != mpage->file)
417: continue;
418:
1.10 schwarze 419: if (form) {
420: sep1 = "man";
421: fsec = sec;
422: } else {
423: sep1 = "cat";
424: fsec = "0";
425: }
1.13 schwarze 426: sep2 = '\0' == *arch ? "" : "/";
1.15 schwarze 427: mandoc_asprintf(&mpage->file, "%s/%s%s%s%s/%s.%s",
428: path, sep1, sec, sep2, arch, name, fsec);
1.2 schwarze 429: }
430: if (SQLITE_DONE != c)
431: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
432: sqlite3_reset(s);
1.13 schwarze 433:
434: /* Append one final section to the names. */
435:
436: if (NULL != prevsec) {
437: sep2 = '\0' == *prevarch ? "" : "/";
1.15 schwarze 438: mandoc_asprintf(&newnames, "%s(%s%s%s)",
439: mpage->names, prevsec, sep2, prevarch);
1.13 schwarze 440: free(mpage->names);
441: mpage->names = newnames;
442: free(prevsec);
443: free(prevarch);
444: }
1.3 schwarze 445: }
446:
447: static char *
448: buildoutput(sqlite3 *db, sqlite3_stmt *s, uint64_t id, uint64_t outbit)
449: {
450: char *output, *newoutput;
451: const char *oldoutput, *sep1, *data;
452: size_t i;
453: int c;
454:
455: output = NULL;
456: i = 1;
457: SQL_BIND_INT64(db, s, i, id);
458: SQL_BIND_INT64(db, s, i, outbit);
459: while (SQLITE_ROW == (c = sqlite3_step(s))) {
460: if (NULL == output) {
461: oldoutput = "";
462: sep1 = "";
463: } else {
464: oldoutput = output;
465: sep1 = " # ";
466: }
467: data = sqlite3_column_text(s, 1);
1.15 schwarze 468: mandoc_asprintf(&newoutput, "%s%s%s",
469: oldoutput, sep1, data);
1.3 schwarze 470: free(output);
471: output = newoutput;
472: }
473: if (SQLITE_DONE != c)
474: fprintf(stderr, "%s\n", sqlite3_errmsg(db));
475: sqlite3_reset(s);
476: return(output);
1.1 schwarze 477: }
478:
479: /*
480: * Implement substring match as an application-defined SQL function.
481: * Using the SQL LIKE or GLOB operators instead would be a bad idea
482: * because that would require escaping metacharacters in the string
483: * being searched for.
484: */
485: static void
486: sql_match(sqlite3_context *context, int argc, sqlite3_value **argv)
487: {
488:
489: assert(2 == argc);
490: sqlite3_result_int(context, NULL != strcasestr(
491: (const char *)sqlite3_value_text(argv[1]),
492: (const char *)sqlite3_value_text(argv[0])));
493: }
494:
495: /*
496: * Implement regular expression match
497: * as an application-defined SQL function.
498: */
499: static void
500: sql_regexp(sqlite3_context *context, int argc, sqlite3_value **argv)
501: {
502:
503: assert(2 == argc);
504: sqlite3_result_int(context, !regexec(
505: (regex_t *)sqlite3_value_blob(argv[0]),
506: (const char *)sqlite3_value_text(argv[1]),
507: 0, NULL, 0));
508: }
509:
1.4 schwarze 510: static void
511: sql_append(char **sql, size_t *sz, const char *newstr, int count)
512: {
513: size_t newsz;
514:
515: newsz = 1 < count ? (size_t)count : strlen(newstr);
516: *sql = mandoc_realloc(*sql, *sz + newsz + 1);
517: if (1 < count)
518: memset(*sql + *sz, *newstr, (size_t)count);
519: else
520: memcpy(*sql + *sz, newstr, newsz);
521: *sz += newsz;
522: (*sql)[*sz] = '\0';
523: }
524:
1.1 schwarze 525: /*
526: * Prepare the search SQL statement.
527: */
528: static char *
1.6 schwarze 529: sql_statement(const struct expr *e)
1.1 schwarze 530: {
531: char *sql;
532: size_t sz;
1.4 schwarze 533: int needop;
1.1 schwarze 534:
1.4 schwarze 535: sql = mandoc_strdup("SELECT * FROM mpages WHERE ");
1.1 schwarze 536: sz = strlen(sql);
537:
1.4 schwarze 538: for (needop = 0; NULL != e; e = e->next) {
539: if (e->and)
540: sql_append(&sql, &sz, " AND ", 1);
541: else if (needop)
542: sql_append(&sql, &sz, " OR ", 1);
543: if (e->open)
544: sql_append(&sql, &sz, "(", e->open);
1.17 schwarze 545: sql_append(&sql, &sz,
546: TYPE_Nd & e->bits
547: ? (NULL == e->substr
548: ? "desc REGEXP ?"
549: : "desc MATCH ?")
1.18 schwarze 550: : TYPE_Nm == e->bits
551: ? (NULL == e->substr
552: ? "id IN (SELECT pageid FROM names "
553: "WHERE name REGEXP ?)"
554: : "id IN (SELECT pageid FROM names "
555: "WHERE name MATCH ?)")
1.17 schwarze 556: : (NULL == e->substr
557: ? "id IN (SELECT pageid FROM keys "
558: "WHERE key REGEXP ? AND bits & ?)"
559: : "id IN (SELECT pageid FROM keys "
560: "WHERE key MATCH ? AND bits & ?)"), 1);
1.4 schwarze 561: if (e->close)
562: sql_append(&sql, &sz, ")", e->close);
563: needop = 1;
1.1 schwarze 564: }
565:
566: return(sql);
567: }
568:
569: /*
570: * Compile a set of string tokens into an expression.
571: * Tokens in "argv" are assumed to be individual expression atoms (e.g.,
572: * "(", "foo=bar", etc.).
573: */
574: static struct expr *
575: exprcomp(const struct mansearch *search, int argc, char *argv[])
576: {
1.18 schwarze 577: uint64_t mask;
1.4 schwarze 578: int i, toopen, logic, igncase, toclose;
1.18 schwarze 579: struct expr *first, *prev, *cur, *next;
1.1 schwarze 580:
581: first = cur = NULL;
1.6 schwarze 582: logic = igncase = toclose = 0;
583: toopen = 1;
1.1 schwarze 584:
585: for (i = 0; i < argc; i++) {
1.4 schwarze 586: if (0 == strcmp("(", argv[i])) {
587: if (igncase)
588: goto fail;
589: toopen++;
590: toclose++;
591: continue;
592: } else if (0 == strcmp(")", argv[i])) {
593: if (toopen || logic || igncase || NULL == cur)
594: goto fail;
595: cur->close++;
596: if (0 > --toclose)
597: goto fail;
598: continue;
599: } else if (0 == strcmp("-a", argv[i])) {
600: if (toopen || logic || igncase || NULL == cur)
601: goto fail;
602: logic = 1;
603: continue;
604: } else if (0 == strcmp("-o", argv[i])) {
605: if (toopen || logic || igncase || NULL == cur)
606: goto fail;
607: logic = 2;
608: continue;
609: } else if (0 == strcmp("-i", argv[i])) {
610: if (igncase)
611: goto fail;
612: igncase = 1;
613: continue;
1.1 schwarze 614: }
1.4 schwarze 615: next = exprterm(search, argv[i], !igncase);
616: if (NULL == next)
617: goto fail;
1.17 schwarze 618: if (NULL == first)
619: first = next;
620: else
1.1 schwarze 621: cur->next = next;
1.18 schwarze 622: prev = cur = next;
1.17 schwarze 623:
624: /*
625: * Searching for descriptions must be split out
626: * because they are stored in the mpages table,
627: * not in the keys table.
628: */
629:
1.18 schwarze 630: for (mask = TYPE_Nm; mask <= TYPE_Nd; mask <<= 1) {
631: if (mask & cur->bits && ~mask & cur->bits) {
632: next = mandoc_calloc(1,
633: sizeof(struct expr));
634: memcpy(next, cur, sizeof(struct expr));
635: prev->open = 1;
636: cur->bits = mask;
637: cur->next = next;
638: cur = next;
639: cur->bits &= ~mask;
640: }
641: }
642: prev->and = (1 == logic);
643: prev->open += toopen;
644: if (cur != prev)
1.17 schwarze 645: cur->close = 1;
1.18 schwarze 646:
1.4 schwarze 647: toopen = logic = igncase = 0;
1.1 schwarze 648: }
1.6 schwarze 649: if (toopen || logic || igncase || toclose)
650: goto fail;
651:
652: cur->close++;
653: cur = exprspec(cur, TYPE_arch, search->arch, "^(%s|any)$");
654: exprspec(cur, TYPE_sec, search->sec, "^%s$");
655:
656: return(first);
657:
1.4 schwarze 658: fail:
659: if (NULL != first)
660: exprfree(first);
661: return(NULL);
1.1 schwarze 662: }
663:
664: static struct expr *
1.6 schwarze 665: exprspec(struct expr *cur, uint64_t key, const char *value,
666: const char *format)
667: {
668: char errbuf[BUFSIZ];
669: char *cp;
670: int irc;
671:
672: if (NULL == value)
673: return(cur);
674:
1.15 schwarze 675: mandoc_asprintf(&cp, format, value);
1.6 schwarze 676: cur->next = mandoc_calloc(1, sizeof(struct expr));
677: cur = cur->next;
678: cur->and = 1;
679: cur->bits = key;
680: if (0 != (irc = regcomp(&cur->regexp, cp,
681: REG_EXTENDED | REG_NOSUB | REG_ICASE))) {
682: regerror(irc, &cur->regexp, errbuf, sizeof(errbuf));
683: fprintf(stderr, "regcomp: %s\n", errbuf);
684: cur->substr = value;
685: }
686: free(cp);
687: return(cur);
688: }
689:
690: static struct expr *
1.1 schwarze 691: exprterm(const struct mansearch *search, char *buf, int cs)
692: {
1.6 schwarze 693: char errbuf[BUFSIZ];
1.1 schwarze 694: struct expr *e;
695: char *key, *v;
1.11 schwarze 696: uint64_t iterbit;
697: int i, irc;
1.1 schwarze 698:
699: if ('\0' == *buf)
700: return(NULL);
701:
702: e = mandoc_calloc(1, sizeof(struct expr));
703:
704: /*"whatis" mode uses an opaque string and default fields. */
705:
706: if (MANSEARCH_WHATIS & search->flags) {
707: e->substr = buf;
708: e->bits = search->deftype;
709: return(e);
710: }
711:
712: /*
713: * If no =~ is specified, search with equality over names and
714: * descriptions.
715: * If =~ begins the phrase, use name and description fields.
716: */
717:
718: if (NULL == (v = strpbrk(buf, "=~"))) {
719: e->substr = buf;
720: e->bits = search->deftype;
721: return(e);
722: } else if (v == buf)
723: e->bits = search->deftype;
724:
725: if ('~' == *v++) {
1.12 schwarze 726: if (NULL != strstr(buf, "arch"))
727: cs = 0;
1.6 schwarze 728: if (0 != (irc = regcomp(&e->regexp, v,
729: REG_EXTENDED | REG_NOSUB | (cs ? 0 : REG_ICASE)))) {
730: regerror(irc, &e->regexp, errbuf, sizeof(errbuf));
731: fprintf(stderr, "regcomp: %s\n", errbuf);
1.1 schwarze 732: free(e);
733: return(NULL);
734: }
735: } else
736: e->substr = v;
737: v[-1] = '\0';
738:
739: /*
740: * Parse out all possible fields.
741: * If the field doesn't resolve, bail.
742: */
743:
744: while (NULL != (key = strsep(&buf, ","))) {
745: if ('\0' == *key)
746: continue;
1.11 schwarze 747: for (i = 0, iterbit = 1;
748: i < mansearch_keymax;
749: i++, iterbit <<= 1) {
750: if (0 == strcasecmp(key,
751: mansearch_keynames[i])) {
752: e->bits |= iterbit;
753: break;
754: }
755: }
756: if (i == mansearch_keymax) {
757: if (strcasecmp(key, "any")) {
758: free(e);
759: return(NULL);
760: }
761: e->bits |= ~0ULL;
1.1 schwarze 762: }
763: }
764:
765: return(e);
766: }
767:
768: static void
769: exprfree(struct expr *p)
770: {
771: struct expr *pp;
772:
773: while (NULL != p) {
774: pp = p->next;
775: free(p);
776: p = pp;
777: }
778: }
779:
780: static void *
781: hash_halloc(size_t sz, void *arg)
782: {
783:
784: return(mandoc_calloc(sz, 1));
785: }
786:
787: static void *
788: hash_alloc(size_t sz, void *arg)
789: {
790:
791: return(mandoc_malloc(sz));
792: }
793:
794: static void
795: hash_free(void *p, size_t sz, void *arg)
796: {
797:
798: free(p);
799: }