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perf_counter tools: add in basic glue from Git
[deliverable/linux.git] / Documentation / perf_counter / config.c
CommitLineData
07800601
IM		 1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
6 *
7 */
8#include "util.h"
9#include "cache.h"
10#include "exec_cmd.h"
11
12#define MAXNAME (256)
13
14static FILE *config_file;
15static const char *config_file_name;
16static int config_linenr;
17static int config_file_eof;
18static int zlib_compression_seen;
19
20const char *config_exclusive_filename = NULL;
21
22static int get_next_char(void)
23{
24 int c;
25 FILE *f;
26
27 c = '\n';
28 if ((f = config_file) != NULL) {
29 c = fgetc(f);
30 if (c == '\r') {
31 /* DOS like systems */
32 c = fgetc(f);
33 if (c != '\n') {
34 ungetc(c, f);
35 c = '\r';
36 }
37 }
38 if (c == '\n')
39 config_linenr++;
40 if (c == EOF) {
41 config_file_eof = 1;
42 c = '\n';
43 }
44 }
45 return c;
46}
47
48static char *parse_value(void)
49{
50 static char value[1024];
51 int quote = 0, comment = 0, len = 0, space = 0;
52
53 for (;;) {
54 int c = get_next_char();
55 if (len >= sizeof(value) - 1)
56 return NULL;
57 if (c == '\n') {
58 if (quote)
59 return NULL;
60 value[len] = 0;
61 return value;
62 }
63 if (comment)
64 continue;
65 if (isspace(c) && !quote) {
66 space = 1;
67 continue;
68 }
69 if (!quote) {
70 if (c == ';' || c == '#') {
71 comment = 1;
72 continue;
73 }
74 }
75 if (space) {
76 if (len)
77 value[len++] = ' ';
78 space = 0;
79 }
80 if (c == '\\') {
81 c = get_next_char();
82 switch (c) {
83 case '\n':
84 continue;
85 case 't':
86 c = '\t';
87 break;
88 case 'b':
89 c = '\b';
90 break;
91 case 'n':
92 c = '\n';
93 break;
94 /* Some characters escape as themselves */
95 case '\\': case '"':
96 break;
97 /* Reject unknown escape sequences */
98 default:
99 return NULL;
100 }
101 value[len++] = c;
102 continue;
103 }
104 if (c == '"') {
105 quote = 1-quote;
106 continue;
107 }
108 value[len++] = c;
109 }
110}
111
112static inline int iskeychar(int c)
113{
114 return isalnum(c) || c == '-';
115}
116
117static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
118{
119 int c;
120 char *value;
121
122 /* Get the full name */
123 for (;;) {
124 c = get_next_char();
125 if (config_file_eof)
126 break;
127 if (!iskeychar(c))
128 break;
129 name[len++] = tolower(c);
130 if (len >= MAXNAME)
131 return -1;
132 }
133 name[len] = 0;
134 while (c == ' ' || c == '\t')
135 c = get_next_char();
136
137 value = NULL;
138 if (c != '\n') {
139 if (c != '=')
140 return -1;
141 value = parse_value();
142 if (!value)
143 return -1;
144 }
145 return fn(name, value, data);
146}
147
148static int get_extended_base_var(char *name, int baselen, int c)
149{
150 do {
151 if (c == '\n')
152 return -1;
153 c = get_next_char();
154 } while (isspace(c));
155
156 /* We require the format to be '[base "extension"]' */
157 if (c != '"')
158 return -1;
159 name[baselen++] = '.';
160
161 for (;;) {
162 int c = get_next_char();
163 if (c == '\n')
164 return -1;
165 if (c == '"')
166 break;
167 if (c == '\\') {
168 c = get_next_char();
169 if (c == '\n')
170 return -1;
171 }
172 name[baselen++] = c;
173 if (baselen > MAXNAME / 2)
174 return -1;
175 }
176
177 /* Final ']' */
178 if (get_next_char() != ']')
179 return -1;
180 return baselen;
181}
182
183static int get_base_var(char *name)
184{
185 int baselen = 0;
186
187 for (;;) {
188 int c = get_next_char();
189 if (config_file_eof)
190 return -1;
191 if (c == ']')
192 return baselen;
193 if (isspace(c))
194 return get_extended_base_var(name, baselen, c);
195 if (!iskeychar(c) && c != '.')
196 return -1;
197 if (baselen > MAXNAME / 2)
198 return -1;
199 name[baselen++] = tolower(c);
200 }
201}
202
203static int perf_parse_file(config_fn_t fn, void *data)
204{
205 int comment = 0;
206 int baselen = 0;
207 static char var[MAXNAME];
208
209 /* U+FEFF Byte Order Mark in UTF8 */
210 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
211 const unsigned char *bomptr = utf8_bom;
212
213 for (;;) {
214 int c = get_next_char();
215 if (bomptr && *bomptr) {
216 /* We are at the file beginning; skip UTF8-encoded BOM
217 * if present. Sane editors won't put this in on their
218 * own, but e.g. Windows Notepad will do it happily. */
219 if ((unsigned char) c == *bomptr) {
220 bomptr++;
221 continue;
222 } else {
223 /* Do not tolerate partial BOM. */
224 if (bomptr != utf8_bom)
225 break;
226 /* No BOM at file beginning. Cool. */
227 bomptr = NULL;
228 }
229 }
230 if (c == '\n') {
231 if (config_file_eof)
232 return 0;
233 comment = 0;
234 continue;
235 }
236 if (comment || isspace(c))
237 continue;
238 if (c == '#' || c == ';') {
239 comment = 1;
240 continue;
241 }
242 if (c == '[') {
243 baselen = get_base_var(var);
244 if (baselen <= 0)
245 break;
246 var[baselen++] = '.';
247 var[baselen] = 0;
248 continue;
249 }
250 if (!isalpha(c))
251 break;
252 var[baselen] = tolower(c);
253 if (get_value(fn, data, var, baselen+1) < 0)
254 break;
255 }
256 die("bad config file line %d in %s", config_linenr, config_file_name);
257}
258
259static int parse_unit_factor(const char *end, unsigned long *val)
260{
261 if (!*end)
262 return 1;
263 else if (!strcasecmp(end, "k")) {
264 *val *= 1024;
265 return 1;
266 }
267 else if (!strcasecmp(end, "m")) {
268 *val *= 1024 * 1024;
269 return 1;
270 }
271 else if (!strcasecmp(end, "g")) {
272 *val *= 1024 * 1024 * 1024;
273 return 1;
274 }
275 return 0;
276}
277
278static int perf_parse_long(const char *value, long *ret)
279{
280 if (value && *value) {
281 char *end;
282 long val = strtol(value, &end, 0);
283 unsigned long factor = 1;
284 if (!parse_unit_factor(end, &factor))
285 return 0;
286 *ret = val * factor;
287 return 1;
288 }
289 return 0;
290}
291
292int perf_parse_ulong(const char *value, unsigned long *ret)
293{
294 if (value && *value) {
295 char *end;
296 unsigned long val = strtoul(value, &end, 0);
297 if (!parse_unit_factor(end, &val))
298 return 0;
299 *ret = val;
300 return 1;
301 }
302 return 0;
303}
304
305static void die_bad_config(const char *name)
306{
307 if (config_file_name)
308 die("bad config value for '%s' in %s", name, config_file_name);
309 die("bad config value for '%s'", name);
310}
311
312int perf_config_int(const char *name, const char *value)
313{
314 long ret = 0;
315 if (!perf_parse_long(value, &ret))
316 die_bad_config(name);
317 return ret;
318}
319
320unsigned long perf_config_ulong(const char *name, const char *value)
321{
322 unsigned long ret;
323 if (!perf_parse_ulong(value, &ret))
324 die_bad_config(name);
325 return ret;
326}
327
328int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
329{
330 *is_bool = 1;
331 if (!value)
332 return 1;
333 if (!*value)
334 return 0;
335 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
336 return 1;
337 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
338 return 0;
339 *is_bool = 0;
340 return perf_config_int(name, value);
341}
342
343int perf_config_bool(const char *name, const char *value)
344{
345 int discard;
346 return !!perf_config_bool_or_int(name, value, &discard);
347}
348
349int perf_config_string(const char **dest, const char *var, const char *value)
350{
351 if (!value)
352 return config_error_nonbool(var);
353 *dest = strdup(value);
354 return 0;
355}
356
357static int perf_default_core_config(const char *var, const char *value)
358{
359 /* Add other config variables here and to Documentation/config.txt. */
360 return 0;
361}
362
363int perf_default_config(const char *var, const char *value, void *dummy)
364{
365 if (!prefixcmp(var, "core."))
366 return perf_default_core_config(var, value);
367
368 /* Add other config variables here and to Documentation/config.txt. */
369 return 0;
370}
371
372int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
373{
374 int ret;
375 FILE *f = fopen(filename, "r");
376
377 ret = -1;
378 if (f) {
379 config_file = f;
380 config_file_name = filename;
381 config_linenr = 1;
382 config_file_eof = 0;
383 ret = perf_parse_file(fn, data);
384 fclose(f);
385 config_file_name = NULL;
386 }
387 return ret;
388}
389
390const char *perf_etc_perfconfig(void)
391{
392 static const char *system_wide;
393 if (!system_wide)
394 system_wide = system_path(ETC_PERFCONFIG);
395 return system_wide;
396}
397
398static int perf_env_bool(const char *k, int def)
399{
400 const char *v = getenv(k);
401 return v ? perf_config_bool(k, v) : def;
402}
403
404int perf_config_system(void)
405{
406 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
407}
408
409int perf_config_global(void)
410{
411 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
412}
413
414int perf_config(config_fn_t fn, void *data)
415{
416 int ret = 0, found = 0;
417 char *repo_config = NULL;
418 const char *home = NULL;
419
420 /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
421 if (config_exclusive_filename)
422 return perf_config_from_file(fn, config_exclusive_filename, data);
423 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
424 ret += perf_config_from_file(fn, perf_etc_perfconfig(),
425 data);
426 found += 1;
427 }
428
429 home = getenv("HOME");
430 if (perf_config_global() && home) {
431 char *user_config = strdup(mkpath("%s/.perfconfig", home));
432 if (!access(user_config, R_OK)) {
433 ret += perf_config_from_file(fn, user_config, data);
434 found += 1;
435 }
436 free(user_config);
437 }
438
439 repo_config = perf_pathdup("config");
440 if (!access(repo_config, R_OK)) {
441 ret += perf_config_from_file(fn, repo_config, data);
442 found += 1;
443 }
444 free(repo_config);
445 if (found == 0)
446 return -1;
447 return ret;
448}
449
450/*
451 * Find all the stuff for perf_config_set() below.
452 */
453
454#define MAX_MATCHES 512
455
456static struct {
457 int baselen;
458 char* key;
459 int do_not_match;
460 regex_t* value_regex;
461 int multi_replace;
462 size_t offset[MAX_MATCHES];
463 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
464 int seen;
465} store;
466
467static int matches(const char* key, const char* value)
468{
469 return !strcmp(key, store.key) &&
470 (store.value_regex == NULL ||
471 (store.do_not_match ^
472 !regexec(store.value_regex, value, 0, NULL, 0)));
473}
474
475static int store_aux(const char* key, const char* value, void *cb)
476{
477 const char *ep;
478 size_t section_len;
479
480 switch (store.state) {
481 case KEY_SEEN:
482 if (matches(key, value)) {
483 if (store.seen == 1 && store.multi_replace == 0) {
484 warning("%s has multiple values", key);
485 } else if (store.seen >= MAX_MATCHES) {
486 error("too many matches for %s", key);
487 return 1;
488 }
489
490 store.offset[store.seen] = ftell(config_file);
491 store.seen++;
492 }
493 break;
494 case SECTION_SEEN:
495 /*
496 * What we are looking for is in store.key (both
497 * section and var), and its section part is baselen
498 * long. We found key (again, both section and var).
499 * We would want to know if this key is in the same
500 * section as what we are looking for. We already
501 * know we are in the same section as what should
502 * hold store.key.
503 */
504 ep = strrchr(key, '.');
505 section_len = ep - key;
506
507 if ((section_len != store.baselen) ||
508 memcmp(key, store.key, section_len+1)) {
509 store.state = SECTION_END_SEEN;
510 break;
511 }
512
513 /*
514 * Do not increment matches: this is no match, but we
515 * just made sure we are in the desired section.
516 */
517 store.offset[store.seen] = ftell(config_file);
518 /* fallthru */
519 case SECTION_END_SEEN:
520 case START:
521 if (matches(key, value)) {
522 store.offset[store.seen] = ftell(config_file);
523 store.state = KEY_SEEN;
524 store.seen++;
525 } else {
526 if (strrchr(key, '.') - key == store.baselen &&
527 !strncmp(key, store.key, store.baselen)) {
528 store.state = SECTION_SEEN;
529 store.offset[store.seen] = ftell(config_file);
530 }
531 }
532 }
533 return 0;
534}
535
536static int write_error(const char *filename)
537{
538 error("failed to write new configuration file %s", filename);
539
540 /* Same error code as "failed to rename". */
541 return 4;
542}
543
544static int store_write_section(int fd, const char* key)
545{
546 const char *dot;
547 int i, success;
548 struct strbuf sb = STRBUF_INIT;
549
550 dot = memchr(key, '.', store.baselen);
551 if (dot) {
552 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
553 for (i = dot - key + 1; i < store.baselen; i++) {
554 if (key[i] == '"' || key[i] == '\\')
555 strbuf_addch(&sb, '\\');
556 strbuf_addch(&sb, key[i]);
557 }
558 strbuf_addstr(&sb, "\"]\n");
559 } else {
560 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
561 }
562
563 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
564 strbuf_release(&sb);
565
566 return success;
567}
568
569static int store_write_pair(int fd, const char* key, const char* value)
570{
571 int i, success;
572 int length = strlen(key + store.baselen + 1);
573 const char *quote = "";
574 struct strbuf sb = STRBUF_INIT;
575
576 /*
577 * Check to see if the value needs to be surrounded with a dq pair.
578 * Note that problematic characters are always backslash-quoted; this
579 * check is about not losing leading or trailing SP and strings that
580 * follow beginning-of-comment characters (i.e. ';' and '#') by the
581 * configuration parser.
582 */
583 if (value[0] == ' ')
584 quote = "\"";
585 for (i = 0; value[i]; i++)
586 if (value[i] == ';' || value[i] == '#')
587 quote = "\"";
588 if (i && value[i - 1] == ' ')
589 quote = "\"";
590
591 strbuf_addf(&sb, "\t%.*s = %s",
592 length, key + store.baselen + 1, quote);
593
594 for (i = 0; value[i]; i++)
595 switch (value[i]) {
596 case '\n':
597 strbuf_addstr(&sb, "\\n");
598 break;
599 case '\t':
600 strbuf_addstr(&sb, "\\t");
601 break;
602 case '"':
603 case '\\':
604 strbuf_addch(&sb, '\\');
605 default:
606 strbuf_addch(&sb, value[i]);
607 break;
608 }
609 strbuf_addf(&sb, "%s\n", quote);
610
611 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
612 strbuf_release(&sb);
613
614 return success;
615}
616
617static ssize_t find_beginning_of_line(const char* contents, size_t size,
618 size_t offset_, int* found_bracket)
619{
620 size_t equal_offset = size, bracket_offset = size;
621 ssize_t offset;
622
623contline:
624 for (offset = offset_-2; offset > 0
625 && contents[offset] != '\n'; offset--)
626 switch (contents[offset]) {
627 case '=': equal_offset = offset; break;
628 case ']': bracket_offset = offset; break;
629 }
630 if (offset > 0 && contents[offset-1] == '\\') {
631 offset_ = offset;
632 goto contline;
633 }
634 if (bracket_offset < equal_offset) {
635 *found_bracket = 1;
636 offset = bracket_offset+1;
637 } else
638 offset++;
639
640 return offset;
641}
642
643int perf_config_set(const char* key, const char* value)
644{
645 return perf_config_set_multivar(key, value, NULL, 0);
646}
647
648/*
649 * If value==NULL, unset in (remove from) config,
650 * if value_regex!=NULL, disregard key/value pairs where value does not match.
651 * if multi_replace==0, nothing, or only one matching key/value is replaced,
652 * else all matching key/values (regardless how many) are removed,
653 * before the new pair is written.
654 *
655 * Returns 0 on success.
656 *
657 * This function does this:
658 *
659 * - it locks the config file by creating ".perf/config.lock"
660 *
661 * - it then parses the config using store_aux() as validator to find
662 * the position on the key/value pair to replace. If it is to be unset,
663 * it must be found exactly once.
664 *
665 * - the config file is mmap()ed and the part before the match (if any) is
666 * written to the lock file, then the changed part and the rest.
667 *
668 * - the config file is removed and the lock file rename()d to it.
669 *
670 */
671int perf_config_set_multivar(const char* key, const char* value,
672 const char* value_regex, int multi_replace)
673{
674 int i, dot;
675 int fd = -1, in_fd;
676 int ret;
677 char* config_filename;
678 const char* last_dot = strrchr(key, '.');
679
680 if (config_exclusive_filename)
681 config_filename = strdup(config_exclusive_filename);
682 else
683 config_filename = perf_pathdup("config");
684
685 /*
686 * Since "key" actually contains the section name and the real
687 * key name separated by a dot, we have to know where the dot is.
688 */
689
690 if (last_dot == NULL) {
691 error("key does not contain a section: %s", key);
692 ret = 2;
693 goto out_free;
694 }
695 store.baselen = last_dot - key;
696
697 store.multi_replace = multi_replace;
698
699 /*
700 * Validate the key and while at it, lower case it for matching.
701 */
702 store.key = malloc(strlen(key) + 1);
703 dot = 0;
704 for (i = 0; key[i]; i++) {
705 unsigned char c = key[i];
706 if (c == '.')
707 dot = 1;
708 /* Leave the extended basename untouched.. */
709 if (!dot || i > store.baselen) {
710 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
711 error("invalid key: %s", key);
712 free(store.key);
713 ret = 1;
714 goto out_free;
715 }
716 c = tolower(c);
717 } else if (c == '\n') {
718 error("invalid key (newline): %s", key);
719 free(store.key);
720 ret = 1;
721 goto out_free;
722 }
723 store.key[i] = c;
724 }
725 store.key[i] = 0;
726
727 /*
728 * If .perf/config does not exist yet, write a minimal version.
729 */
730 in_fd = open(config_filename, O_RDONLY);
731 if ( in_fd < 0 ) {
732 free(store.key);
733
734 if ( ENOENT != errno ) {
735 error("opening %s: %s", config_filename,
736 strerror(errno));
737 ret = 3; /* same as "invalid config file" */
738 goto out_free;
739 }
740 /* if nothing to unset, error out */
741 if (value == NULL) {
742 ret = 5;
743 goto out_free;
744 }
745
746 store.key = (char*)key;
747 if (!store_write_section(fd, key) ||
748 !store_write_pair(fd, key, value))
749 goto write_err_out;
750 } else {
751 struct stat st;
752 char* contents;
753 size_t contents_sz, copy_begin, copy_end;
754 int i, new_line = 0;
755
756 if (value_regex == NULL)
757 store.value_regex = NULL;
758 else {
759 if (value_regex[0] == '!') {
760 store.do_not_match = 1;
761 value_regex++;
762 } else
763 store.do_not_match = 0;
764
765 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
766 if (regcomp(store.value_regex, value_regex,
767 REG_EXTENDED)) {
768 error("invalid pattern: %s", value_regex);
769 free(store.value_regex);
770 ret = 6;
771 goto out_free;
772 }
773 }
774
775 store.offset[0] = 0;
776 store.state = START;
777 store.seen = 0;
778
779 /*
780 * After this, store.offset will contain the *end* offset
781 * of the last match, or remain at 0 if no match was found.
782 * As a side effect, we make sure to transform only a valid
783 * existing config file.
784 */
785 if (perf_config_from_file(store_aux, config_filename, NULL)) {
786 error("invalid config file %s", config_filename);
787 free(store.key);
788 if (store.value_regex != NULL) {
789 regfree(store.value_regex);
790 free(store.value_regex);
791 }
792 ret = 3;
793 goto out_free;
794 }
795
796 free(store.key);
797 if (store.value_regex != NULL) {
798 regfree(store.value_regex);
799 free(store.value_regex);
800 }
801
802 /* if nothing to unset, or too many matches, error out */
803 if ((store.seen == 0 && value == NULL) ||
804 (store.seen > 1 && multi_replace == 0)) {
805 ret = 5;
806 goto out_free;
807 }
808
809 fstat(in_fd, &st);
810 contents_sz = xsize_t(st.st_size);
811 contents = mmap(NULL, contents_sz, PROT_READ,
812 MAP_PRIVATE, in_fd, 0);
813 close(in_fd);
814
815 if (store.seen == 0)
816 store.seen = 1;
817
818 for (i = 0, copy_begin = 0; i < store.seen; i++) {
819 if (store.offset[i] == 0) {
820 store.offset[i] = copy_end = contents_sz;
821 } else if (store.state != KEY_SEEN) {
822 copy_end = store.offset[i];
823 } else
824 copy_end = find_beginning_of_line(
825 contents, contents_sz,
826 store.offset[i]-2, &new_line);
827
828 if (copy_end > 0 && contents[copy_end-1] != '\n')
829 new_line = 1;
830
831 /* write the first part of the config */
832 if (copy_end > copy_begin) {
833 if (write_in_full(fd, contents + copy_begin,
834 copy_end - copy_begin) <
835 copy_end - copy_begin)
836 goto write_err_out;
837 if (new_line &&
838 write_in_full(fd, "\n", 1) != 1)
839 goto write_err_out;
840 }
841 copy_begin = store.offset[i];
842 }
843
844 /* write the pair (value == NULL means unset) */
845 if (value != NULL) {
846 if (store.state == START) {
847 if (!store_write_section(fd, key))
848 goto write_err_out;
849 }
850 if (!store_write_pair(fd, key, value))
851 goto write_err_out;
852 }
853
854 /* write the rest of the config */
855 if (copy_begin < contents_sz)
856 if (write_in_full(fd, contents + copy_begin,
857 contents_sz - copy_begin) <
858 contents_sz - copy_begin)
859 goto write_err_out;
860
861 munmap(contents, contents_sz);
862 }
863
864 ret = 0;
865
866out_free:
867 free(config_filename);
868 return ret;
869
870write_err_out:
871 goto out_free;
872
873}
874
875static int section_name_match (const char *buf, const char *name)
876{
877 int i = 0, j = 0, dot = 0;
878 for (; buf[i] && buf[i] != ']'; i++) {
879 if (!dot && isspace(buf[i])) {
880 dot = 1;
881 if (name[j++] != '.')
882 break;
883 for (i++; isspace(buf[i]); i++)
884 ; /* do nothing */
885 if (buf[i] != '"')
886 break;
887 continue;
888 }
889 if (buf[i] == '\\' && dot)
890 i++;
891 else if (buf[i] == '"' && dot) {
892 for (i++; isspace(buf[i]); i++)
893 ; /* do_nothing */
894 break;
895 }
896 if (buf[i] != name[j++])
897 break;
898 }
899 return (buf[i] == ']' && name[j] == 0);
900}
901
902/* if new_name == NULL, the section is removed instead */
903int perf_config_rename_section(const char *old_name, const char *new_name)
904{
905 int ret = 0, remove = 0;
906 char *config_filename;
907 int out_fd;
908 char buf[1024];
909
910 if (config_exclusive_filename)
911 config_filename = strdup(config_exclusive_filename);
912 else
913 config_filename = perf_pathdup("config");
914 if (out_fd < 0) {
915 ret = error("could not lock config file %s", config_filename);
916 goto out;
917 }
918
919 if (!(config_file = fopen(config_filename, "rb"))) {
920 /* no config file means nothing to rename, no error */
921 goto unlock_and_out;
922 }
923
924 while (fgets(buf, sizeof(buf), config_file)) {
925 int i;
926 int length;
927 for (i = 0; buf[i] && isspace(buf[i]); i++)
928 ; /* do nothing */
929 if (buf[i] == '[') {
930 /* it's a section */
931 if (section_name_match (&buf[i+1], old_name)) {
932 ret++;
933 if (new_name == NULL) {
934 remove = 1;
935 continue;
936 }
937 store.baselen = strlen(new_name);
938 if (!store_write_section(out_fd, new_name)) {
939 goto out;
940 }
941 continue;
942 }
943 remove = 0;
944 }
945 if (remove)
946 continue;
947 length = strlen(buf);
948 if (write_in_full(out_fd, buf, length) != length) {
949 goto out;
950 }
951 }
952 fclose(config_file);
953 unlock_and_out:
954 out:
955 free(config_filename);
956 return ret;
957}
958
959/*
960 * Call this to report error for your variable that should not
961 * get a boolean value (i.e. "[my] var" means "true").
962 */
963int config_error_nonbool(const char *var)
964{
965 return error("Missing value for '%s'", var);
966}
Linux kernel - Deliverables
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