fix more compile errors
[project/uci.git] / file.c
1 /*
2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
4 *
5 * this program is free software; you can redistribute it and/or modify
6 * it under the terms of the gnu lesser general public license version 2.1
7 * as published by the free software foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 /*
16 * This file contains the code for parsing uci config files
17 */
18
19 #define _GNU_SOURCE
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/file.h>
23 #include <stdbool.h>
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <ctype.h>
28
29 #define LINEBUF 32
30 #define LINEBUF_MAX 4096
31
32 static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
33 {
34 struct uci_parse_context *pctx = ctx->pctx;
35
36 pctx->reason = reason;
37 pctx->byte = pos - pctx->buf;
38 UCI_THROW(ctx, UCI_ERR_PARSE);
39 }
40
41 /*
42 * Fetch a new line from the input stream and resize buffer if necessary
43 */
44 static void uci_getln(struct uci_context *ctx, int offset)
45 {
46 struct uci_parse_context *pctx = ctx->pctx;
47 char *p;
48 int ofs;
49
50 if (pctx->buf == NULL) {
51 pctx->buf = uci_malloc(ctx, LINEBUF);
52 pctx->bufsz = LINEBUF;
53 }
54
55 ofs = offset;
56 do {
57 p = &pctx->buf[ofs];
58 p[ofs] = 0;
59
60 p = fgets(p, pctx->bufsz - ofs, pctx->file);
61 if (!p || !*p)
62 return;
63
64 ofs += strlen(p);
65 if (pctx->buf[ofs - 1] == '\n') {
66 pctx->line++;
67 pctx->buf[ofs - 1] = 0;
68 return;
69 }
70
71 if (pctx->bufsz > LINEBUF_MAX/2)
72 uci_parse_error(ctx, p, "line too long");
73
74 pctx->bufsz *= 2;
75 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
76 } while (1);
77 }
78
79 /*
80 * Clean up all extra memory used by the parser and exporter
81 */
82 static void uci_file_cleanup(struct uci_context *ctx)
83 {
84 struct uci_parse_context *pctx;
85
86 if (ctx->buf) {
87 free(ctx->buf);
88 ctx->buf = NULL;
89 ctx->bufsz = 0;
90 }
91
92 pctx = ctx->pctx;
93 if (!pctx)
94 return;
95
96 ctx->pctx = NULL;
97 if (pctx->package)
98 uci_free_package(&pctx->package);
99
100 if (pctx->buf)
101 free(pctx->buf);
102
103 free(pctx);
104 }
105
106 /*
107 * parse a character escaped by '\'
108 * returns true if the escaped character is to be parsed
109 * returns false if the escaped character is to be ignored
110 */
111 static inline bool parse_backslash(struct uci_context *ctx, char **str)
112 {
113 /* skip backslash */
114 *str += 1;
115
116 /* undecoded backslash at the end of line, fetch the next line */
117 if (!**str) {
118 *str += 1;
119 uci_getln(ctx, *str - ctx->pctx->buf);
120 return false;
121 }
122
123 /* FIXME: decode escaped char, necessary? */
124 return true;
125 }
126
127 /*
128 * move the string pointer forward until a non-whitespace character or
129 * EOL is reached
130 */
131 static void skip_whitespace(struct uci_context *ctx, char **str)
132 {
133 restart:
134 while (**str && isspace(**str))
135 *str += 1;
136
137 if (**str == '\\') {
138 if (!parse_backslash(ctx, str))
139 goto restart;
140 }
141 }
142
143 static inline void addc(char **dest, char **src)
144 {
145 **dest = **src;
146 *dest += 1;
147 *src += 1;
148 }
149
150 /*
151 * parse a double quoted string argument from the command line
152 */
153 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
154 {
155 char c;
156
157 /* skip quote character */
158 *str += 1;
159
160 while ((c = **str)) {
161 switch(c) {
162 case '"':
163 **target = 0;
164 *str += 1;
165 return;
166 case '\\':
167 if (!parse_backslash(ctx, str))
168 continue;
169 /* fall through */
170 default:
171 addc(target, str);
172 break;
173 }
174 }
175 uci_parse_error(ctx, *str, "unterminated \"");
176 }
177
178 /*
179 * parse a single quoted string argument from the command line
180 */
181 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
182 {
183 char c;
184 /* skip quote character */
185 *str += 1;
186
187 while ((c = **str)) {
188 switch(c) {
189 case '\'':
190 **target = 0;
191 *str += 1;
192 return;
193 default:
194 addc(target, str);
195 }
196 }
197 uci_parse_error(ctx, *str, "unterminated '");
198 }
199
200 /*
201 * parse a string from the command line and detect the quoting style
202 */
203 static void parse_str(struct uci_context *ctx, char **str, char **target)
204 {
205 do {
206 switch(**str) {
207 case '\'':
208 parse_single_quote(ctx, str, target);
209 break;
210 case '"':
211 parse_double_quote(ctx, str, target);
212 break;
213 case 0:
214 goto done;
215 case '\\':
216 if (!parse_backslash(ctx, str))
217 continue;
218 /* fall through */
219 default:
220 addc(target, str);
221 break;
222 }
223 } while (**str && !isspace(**str));
224 done:
225
226 /*
227 * if the string was unquoted and we've stopped at a whitespace
228 * character, skip to the next one, because the whitespace will
229 * be overwritten by a null byte here
230 */
231 if (**str)
232 *str += 1;
233
234 /* terminate the parsed string */
235 **target = 0;
236 }
237
238 /*
239 * extract the next argument from the command line
240 */
241 static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
242 {
243 char *val;
244 char *ptr;
245
246 val = ptr = *str;
247 skip_whitespace(ctx, str);
248 parse_str(ctx, str, &ptr);
249 if (!*val) {
250 if (required)
251 uci_parse_error(ctx, *str, "insufficient arguments");
252 goto done;
253 }
254
255 if (name && !uci_validate_name(val))
256 uci_parse_error(ctx, val, "invalid character in field");
257
258 done:
259 return val;
260 }
261
262 /*
263 * verify that the end of the line or command is reached.
264 * throw an error if extra arguments are given on the command line
265 */
266 static void assert_eol(struct uci_context *ctx, char **str)
267 {
268 char *tmp;
269
270 tmp = next_arg(ctx, str, false, false);
271 if (tmp && *tmp)
272 uci_parse_error(ctx, *str, "too many arguments");
273 }
274
275 /*
276 * switch to a different config, either triggered by uci_load, or by a
277 * 'package <...>' statement in the import file
278 */
279 static void uci_switch_config(struct uci_context *ctx)
280 {
281 struct uci_parse_context *pctx;
282 struct uci_element *e;
283 const char *name;
284
285 pctx = ctx->pctx;
286 name = pctx->name;
287
288 /* add the last config to main config file list */
289 if (pctx->package) {
290 uci_list_add(&ctx->root, &pctx->package->e.list);
291
292 pctx->package = NULL;
293 pctx->section = NULL;
294 }
295
296 if (!name)
297 return;
298
299 /*
300 * if an older config under the same name exists, unload it
301 * ignore errors here, e.g. if the config was not found
302 */
303 e = uci_lookup_list(ctx, &ctx->root, name);
304 if (e)
305 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
306 pctx->package = uci_alloc_package(ctx, name);
307 }
308
309 /*
310 * parse the 'package' uci command (next config package)
311 */
312 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
313 {
314 char *name = NULL;
315
316 /* command string null-terminated by strtok */
317 *str += strlen(*str) + 1;
318
319 name = next_arg(ctx, str, true, true);
320 assert_eol(ctx, str);
321 if (single)
322 return;
323
324 ctx->pctx->name = name;
325 uci_switch_config(ctx);
326 }
327
328 /* Based on an efficient hash function published by D. J. Bernstein */
329 static unsigned int djbhash(unsigned int hash, char *str)
330 {
331 int len = strlen(str);
332 int i;
333
334 /* initial value */
335 if (hash == ~0)
336 hash = 5381;
337
338 for(i = 0; i < len; i++) {
339 hash = ((hash << 5) + hash) + str[i];
340 }
341 return (hash & 0x7FFFFFFF);
342 }
343
344 /* fix up an unnamed section */
345 static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
346 {
347 unsigned int hash = ~0;
348 struct uci_element *e;
349 char buf[16];
350
351 if (!s || s->e.name)
352 return;
353
354 /*
355 * Generate a name for unnamed sections. This is used as reference
356 * when locating or updating the section from apps/scripts.
357 * To make multiple concurrent versions somewhat safe for updating,
358 * the name is generated from a hash of its type and name/value
359 * pairs of its option, and it is prefixed by a counter value.
360 * If the order of the unnamed sections changes for some reason,
361 * updates to them will be rejected.
362 */
363 hash = djbhash(hash, s->type);
364 uci_foreach_element(&s->options, e) {
365 hash = djbhash(hash, e->name);
366 hash = djbhash(hash, uci_to_option(e)->value);
367 }
368 sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
369 s->e.name = uci_strdup(ctx, buf);
370 }
371
372 /*
373 * parse the 'config' uci command (open a section)
374 */
375 static void uci_parse_config(struct uci_context *ctx, char **str)
376 {
377 struct uci_parse_context *pctx = ctx->pctx;
378 char *name = NULL;
379 char *type = NULL;
380
381 uci_fixup_section(ctx, ctx->pctx->section);
382 if (!ctx->pctx->package) {
383 if (!ctx->pctx->name)
384 uci_parse_error(ctx, *str, "attempting to import a file without a package name");
385
386 uci_switch_config(ctx);
387 }
388
389 /* command string null-terminated by strtok */
390 *str += strlen(*str) + 1;
391
392 type = next_arg(ctx, str, true, true);
393 name = next_arg(ctx, str, false, true);
394 assert_eol(ctx, str);
395
396 if (pctx->merge) {
397 UCI_TRAP_SAVE(ctx, error);
398 uci_set(ctx, pctx->package, name, NULL, type);
399 UCI_TRAP_RESTORE(ctx);
400 return;
401 error:
402 UCI_THROW(ctx, ctx->errno);
403 } else
404 pctx->section = uci_alloc_section(pctx->package, type, name);
405 }
406
407 /*
408 * parse the 'option' uci command (open a value)
409 */
410 static void uci_parse_option(struct uci_context *ctx, char **str)
411 {
412 struct uci_parse_context *pctx = ctx->pctx;
413 char *name = NULL;
414 char *value = NULL;
415
416 if (!pctx->section)
417 uci_parse_error(ctx, *str, "option command found before the first section");
418
419 /* command string null-terminated by strtok */
420 *str += strlen(*str) + 1;
421
422 name = next_arg(ctx, str, true, true);
423 value = next_arg(ctx, str, true, false);
424 assert_eol(ctx, str);
425
426 if (pctx->merge) {
427 UCI_TRAP_SAVE(ctx, error);
428 uci_set(ctx, pctx->package, pctx->section->e.name, name, value);
429 UCI_TRAP_RESTORE(ctx);
430 return;
431 error:
432 UCI_THROW(ctx, ctx->errno);
433 } else
434 uci_alloc_option(pctx->section, name, value);
435 }
436
437
438 /*
439 * parse a complete input line, split up combined commands by ';'
440 */
441 static void uci_parse_line(struct uci_context *ctx, bool single)
442 {
443 struct uci_parse_context *pctx = ctx->pctx;
444 char *word, *brk = NULL;
445
446 for (word = strtok_r(pctx->buf, ";", &brk);
447 word;
448 word = strtok_r(NULL, ";", &brk)) {
449
450 char *pbrk = NULL;
451 word = strtok_r(word, " \t", &pbrk);
452
453 switch(word[0]) {
454 case 'p':
455 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
456 uci_parse_package(ctx, &word, single);
457 break;
458 case 'c':
459 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
460 uci_parse_config(ctx, &word);
461 break;
462 case 'o':
463 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
464 uci_parse_option(ctx, &word);
465 break;
466 default:
467 uci_parse_error(ctx, word, "unterminated command");
468 break;
469 }
470 }
471 }
472
473 /* max number of characters that escaping adds to the string */
474 #define UCI_QUOTE_ESCAPE "'\\''"
475
476 /*
477 * escape an uci string for export
478 */
479 static char *uci_escape(struct uci_context *ctx, char *str)
480 {
481 char *s, *p;
482 int pos = 0;
483
484 if (!ctx->buf) {
485 ctx->bufsz = LINEBUF;
486 ctx->buf = malloc(LINEBUF);
487 }
488
489 s = str;
490 p = strchr(str, '\'');
491 if (!p)
492 return str;
493
494 do {
495 int len = p - s;
496 if (len > 0) {
497 if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
498 ctx->bufsz *= 2;
499 ctx->buf = realloc(ctx->buf, ctx->bufsz);
500 if (!ctx->buf)
501 UCI_THROW(ctx, UCI_ERR_MEM);
502 }
503 memcpy(&ctx->buf[pos], s, len);
504 pos += len;
505 }
506 strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
507 pos += sizeof(UCI_QUOTE_ESCAPE);
508 s = p + 1;
509 } while ((p = strchr(s, '\'')));
510
511 return ctx->buf;
512 }
513
514
515 /*
516 * export a single config package to a file stream
517 */
518 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
519 {
520 struct uci_context *ctx = p->ctx;
521 struct uci_element *s, *o;
522
523 if (header)
524 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
525 uci_foreach_element(&p->sections, s) {
526 struct uci_section *sec = uci_to_section(s);
527 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
528 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
529 fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
530 fprintf(stream, "\n");
531 uci_foreach_element(&sec->options, o) {
532 struct uci_option *opt = uci_to_option(o);
533 fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
534 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->value));
535 }
536 }
537 fprintf(stream, "\n");
538 }
539
540 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
541 {
542 struct uci_element *e;
543
544 UCI_HANDLE_ERR(ctx);
545 UCI_ASSERT(ctx, stream != NULL);
546
547 if (package)
548 uci_export_package(package, stream, header);
549 else {
550 uci_foreach_element(&ctx->root, e) {
551 uci_export_package(uci_to_package(e), stream, header);
552 }
553 }
554
555 return 0;
556 }
557
558 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
559 {
560 struct uci_parse_context *pctx;
561 UCI_HANDLE_ERR(ctx);
562
563 /* make sure no memory from previous parse attempts is leaked */
564 uci_file_cleanup(ctx);
565
566 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
567 ctx->pctx = pctx;
568 pctx->file = stream;
569 if (*package && single) {
570 pctx->package = *package;
571 pctx->merge = true;
572 }
573
574 /*
575 * If 'name' was supplied, assume that the supplied stream does not contain
576 * the appropriate 'package <name>' string to specify the config name
577 * NB: the config file can still override the package name
578 */
579 if (name)
580 pctx->name = name;
581
582 while (!feof(pctx->file)) {
583 uci_getln(ctx, 0);
584 UCI_TRAP_SAVE(ctx, error);
585 if (pctx->buf[0])
586 uci_parse_line(ctx, single);
587 UCI_TRAP_RESTORE(ctx);
588 continue;
589 error:
590 if (ctx->flags & UCI_FLAG_PERROR)
591 uci_perror(ctx, NULL);
592 if ((ctx->errno != UCI_ERR_PARSE) ||
593 (ctx->flags & UCI_FLAG_STRICT))
594 UCI_THROW(ctx, ctx->errno);
595 }
596
597 uci_fixup_section(ctx, ctx->pctx->section);
598 if (package)
599 *package = pctx->package;
600 if (pctx->merge)
601 pctx->package = NULL;
602
603 pctx->name = NULL;
604 uci_switch_config(ctx);
605
606 /* no error happened, we can get rid of the parser context now */
607 uci_file_cleanup(ctx);
608
609 return 0;
610 }
611
612 /*
613 * open a stream and go to the right position
614 *
615 * note: when opening for write and seeking to the beginning of
616 * the stream, truncate the file
617 */
618 static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
619 {
620 struct stat statbuf;
621 FILE *file = NULL;
622 int fd, ret;
623 int mode = (write ? O_RDWR : O_RDONLY);
624
625 if (create)
626 mode |= O_CREAT;
627
628 if (!write && ((stat(filename, &statbuf) < 0) ||
629 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
630 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
631 }
632
633 fd = open(filename, mode, UCI_FILEMODE);
634 if (fd <= 0)
635 goto error;
636
637 if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
638 goto error;
639
640 ret = lseek(fd, 0, pos);
641
642 if (ret < 0)
643 goto error;
644
645 file = fdopen(fd, (write ? "w+" : "r"));
646 if (file)
647 goto done;
648
649 error:
650 UCI_THROW(ctx, UCI_ERR_IO);
651 done:
652 return file;
653 }
654
655 static void uci_close_stream(FILE *stream)
656 {
657 int fd;
658
659 if (!stream)
660 return;
661
662 fd = fileno(stream);
663 flock(fd, LOCK_UN);
664 fclose(stream);
665 }
666
667 static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
668 {
669 bool delete = false;
670 bool rename = false;
671 char *package = NULL;
672 char *section = NULL;
673 char *option = NULL;
674 char *value = NULL;
675
676 if (buf[0] == '-') {
677 delete = true;
678 buf++;
679 } else if (buf[0] == '@') {
680 rename = true;
681 buf++;
682 }
683
684 UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
685 if (!package || !section || (!delete && !value))
686 goto error;
687 if (strcmp(package, p->e.name) != 0)
688 goto error;
689 if (!uci_validate_name(section))
690 goto error;
691 if (option && !uci_validate_name(option))
692 goto error;
693
694 if (rename)
695 UCI_INTERNAL(uci_rename, ctx, p, section, option, value);
696 else if (delete)
697 UCI_INTERNAL(uci_delete, ctx, p, section, option);
698 else
699 UCI_INTERNAL(uci_set, ctx, p, section, option, value);
700
701 return;
702 error:
703 UCI_THROW(ctx, UCI_ERR_PARSE);
704 }
705
706 static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
707 {
708 struct uci_parse_context *pctx;
709
710 /* make sure no memory from previous parse attempts is leaked */
711 uci_file_cleanup(ctx);
712
713 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
714 ctx->pctx = pctx;
715 pctx->file = stream;
716
717 while (!feof(pctx->file)) {
718 uci_getln(ctx, 0);
719 if (!pctx->buf[0])
720 continue;
721
722 /*
723 * ignore parse errors in single lines, we want to preserve as much
724 * history as possible
725 */
726 UCI_TRAP_SAVE(ctx, error);
727 uci_parse_history_line(ctx, p, pctx->buf);
728 UCI_TRAP_RESTORE(ctx);
729 error:
730 continue;
731 }
732
733 /* no error happened, we can get rid of the parser context now */
734 uci_file_cleanup(ctx);
735 }
736
737 static void uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
738 {
739 char *filename = NULL;
740 FILE *f = NULL;
741
742 if (!p->confdir)
743 return;
744 if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
745 UCI_THROW(ctx, UCI_ERR_MEM);
746
747 UCI_TRAP_SAVE(ctx, done);
748 f = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
749 if (p)
750 uci_parse_history(ctx, f, p);
751 UCI_TRAP_RESTORE(ctx);
752
753 done:
754 if (flush && f) {
755 rewind(f);
756 ftruncate(fileno(f), 0);
757 }
758 if (filename)
759 free(filename);
760 uci_close_stream(f);
761 ctx->errno = 0;
762 }
763
764
765 static char *uci_config_path(struct uci_context *ctx, const char *name)
766 {
767 char *filename;
768
769 if (strchr(name, '/'))
770 UCI_THROW(ctx, UCI_ERR_INVAL);
771 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
772 sprintf(filename, UCI_CONFDIR "/%s", name);
773
774 return filename;
775 }
776
777 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
778 {
779 char *filename;
780 bool confdir;
781 FILE *file = NULL;
782
783 UCI_HANDLE_ERR(ctx);
784 UCI_ASSERT(ctx, uci_validate_name(name));
785
786 switch (name[0]) {
787 case '.':
788 /* relative path outside of /etc/config */
789 if (name[1] != '/')
790 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
791 /* fall through */
792 case '/':
793 /* absolute path outside of /etc/config */
794 filename = uci_strdup(ctx, name);
795 name = strrchr(name, '/') + 1;
796 confdir = false;
797 break;
798 default:
799 /* config in /etc/config */
800 filename = uci_config_path(ctx, name);
801 confdir = true;
802 break;
803 }
804
805 file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
806 ctx->errno = 0;
807 UCI_TRAP_SAVE(ctx, done);
808 UCI_INTERNAL(uci_import, ctx, file, name, package, true);
809 UCI_TRAP_RESTORE(ctx);
810
811 if (*package) {
812 (*package)->path = filename;
813 (*package)->confdir = confdir;
814 uci_load_history(ctx, *package, false);
815 }
816
817 done:
818 uci_close_stream(file);
819 return ctx->errno;
820 }
821
822 int uci_save(struct uci_context *ctx, struct uci_package *p)
823 {
824 FILE *f = NULL;
825 char *filename = NULL;
826 struct uci_element *e, *tmp;
827
828 UCI_HANDLE_ERR(ctx);
829 UCI_ASSERT(ctx, p != NULL);
830
831 /*
832 * if the config file was outside of the /etc/config path,
833 * don't save the history to a file, update the real file
834 * directly.
835 * does not modify the uci_package pointer
836 */
837 if (!p->confdir)
838 return uci_commit(ctx, &p, false);
839
840 if (uci_list_empty(&p->history))
841 return 0;
842
843 if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
844 UCI_THROW(ctx, UCI_ERR_MEM);
845
846 ctx->errno = 0;
847 UCI_TRAP_SAVE(ctx, done);
848 f = uci_open_stream(ctx, filename, SEEK_END, true, true);
849 UCI_TRAP_RESTORE(ctx);
850
851 uci_foreach_element_safe(&p->history, tmp, e) {
852 struct uci_history *h = uci_to_history(e);
853
854 if (h->cmd == UCI_CMD_REMOVE)
855 fprintf(f, "-");
856 else if (h->cmd == UCI_CMD_RENAME)
857 fprintf(f, "@");
858
859 fprintf(f, "%s.%s", p->e.name, h->section);
860 if (e->name)
861 fprintf(f, ".%s", e->name);
862
863 if (h->cmd == UCI_CMD_REMOVE)
864 fprintf(f, "\n");
865 else
866 fprintf(f, "=%s\n", h->value);
867 uci_free_history(h);
868 }
869
870 done:
871 uci_close_stream(f);
872 if (filename)
873 free(filename);
874 if (ctx->errno)
875 UCI_THROW(ctx, ctx->errno);
876
877 return 0;
878 }
879
880 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
881 {
882 struct uci_package *p;
883 FILE *f = NULL;
884 char *name = NULL;
885 char *path = NULL;
886
887 UCI_HANDLE_ERR(ctx);
888 UCI_ASSERT(ctx, package != NULL);
889 p = *package;
890
891 UCI_ASSERT(ctx, p != NULL);
892 if (!p->path) {
893 if (overwrite)
894 p->path = uci_config_path(ctx, p->e.name);
895 else
896 UCI_THROW(ctx, UCI_ERR_INVAL);
897 }
898
899
900 /* open the config file for writing now, so that it is locked */
901 f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
902
903 /* flush unsaved changes and reload from history file */
904 UCI_TRAP_SAVE(ctx, done);
905 if (p->confdir) {
906 if (!overwrite) {
907 name = uci_strdup(ctx, p->e.name);
908 path = uci_strdup(ctx, p->path);
909 if (!uci_list_empty(&p->history))
910 UCI_INTERNAL(uci_save, ctx, p);
911 uci_free_package(&p);
912 uci_file_cleanup(ctx);
913 UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
914
915 p->path = path;
916 p->confdir = true;
917 *package = p;
918
919 /* freed together with the uci_package */
920 path = NULL;
921
922 /* check for updated history, just in case */
923 uci_load_history(ctx, p, true);
924 } else {
925 /* flush history */
926 uci_load_history(ctx, NULL, true);
927 }
928 }
929
930 rewind(f);
931 ftruncate(fileno(f), 0);
932
933 uci_export(ctx, f, p, false);
934 UCI_TRAP_RESTORE(ctx);
935
936 done:
937 if (name)
938 free(name);
939 if (path)
940 free(path);
941 uci_close_stream(f);
942 if (ctx->errno)
943 UCI_THROW(ctx, ctx->errno);
944
945 return 0;
946 }
947
948
949 /*
950 * This function returns the filename by returning the string
951 * after the last '/' character. By checking for a non-'\0'
952 * character afterwards, directories are ignored (glob marks
953 * those with a trailing '/'
954 */
955 static inline char *get_filename(char *path)
956 {
957 char *p;
958
959 p = strrchr(path, '/');
960 p++;
961 if (!*p)
962 return NULL;
963 return p;
964 }
965
966 int uci_list_configs(struct uci_context *ctx, char ***list)
967 {
968 char **configs;
969 glob_t globbuf;
970 int size, i;
971 char *buf;
972
973 UCI_HANDLE_ERR(ctx);
974
975 if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
976 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
977
978 size = sizeof(char *) * (globbuf.gl_pathc + 1);
979 for(i = 0; i < globbuf.gl_pathc; i++) {
980 char *p;
981
982 p = get_filename(globbuf.gl_pathv[i]);
983 if (!p)
984 continue;
985
986 size += strlen(p) + 1;
987 }
988
989 configs = uci_malloc(ctx, size);
990 buf = (char *) &configs[globbuf.gl_pathc + 1];
991 for(i = 0; i < globbuf.gl_pathc; i++) {
992 char *p;
993
994 p = get_filename(globbuf.gl_pathv[i]);
995 if (!p)
996 continue;
997
998 configs[i] = buf;
999 strcpy(buf, p);
1000 buf += strlen(buf) + 1;
1001 }
1002 *list = configs;
1003
1004 return 0;
1005 }
1006