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Commit | Line | Data |
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07800601 | 1 | /* |
5f9273d6 NK |
2 | * config.c |
3 | * | |
4 | * Helper functions for parsing config items. | |
5 | * Originally copied from GIT source. | |
07800601 IM |
6 | * |
7 | * Copyright (C) Linus Torvalds, 2005 | |
8 | * Copyright (C) Johannes Schindelin, 2005 | |
9 | * | |
10 | */ | |
11 | #include "util.h" | |
12 | #include "cache.h" | |
13 | #include "exec_cmd.h" | |
14 | ||
15 | #define MAXNAME (256) | |
16 | ||
45de34bb SE |
17 | #define DEBUG_CACHE_DIR ".debug" |
18 | ||
19 | ||
20 | char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */ | |
21 | ||
07800601 IM |
22 | static FILE *config_file; |
23 | static const char *config_file_name; | |
24 | static int config_linenr; | |
25 | static int config_file_eof; | |
07800601 | 26 | |
a41794cd | 27 | static const char *config_exclusive_filename; |
07800601 IM |
28 | |
29 | static int get_next_char(void) | |
30 | { | |
31 | int c; | |
32 | FILE *f; | |
33 | ||
34 | c = '\n'; | |
35 | if ((f = config_file) != NULL) { | |
36 | c = fgetc(f); | |
37 | if (c == '\r') { | |
38 | /* DOS like systems */ | |
39 | c = fgetc(f); | |
40 | if (c != '\n') { | |
41 | ungetc(c, f); | |
42 | c = '\r'; | |
43 | } | |
44 | } | |
45 | if (c == '\n') | |
46 | config_linenr++; | |
47 | if (c == EOF) { | |
48 | config_file_eof = 1; | |
49 | c = '\n'; | |
50 | } | |
51 | } | |
52 | return c; | |
53 | } | |
54 | ||
55 | static char *parse_value(void) | |
56 | { | |
57 | static char value[1024]; | |
f37a291c IM |
58 | int quote = 0, comment = 0, space = 0; |
59 | size_t len = 0; | |
07800601 IM |
60 | |
61 | for (;;) { | |
62 | int c = get_next_char(); | |
f37a291c | 63 | |
07800601 IM |
64 | if (len >= sizeof(value) - 1) |
65 | return NULL; | |
66 | if (c == '\n') { | |
67 | if (quote) | |
68 | return NULL; | |
69 | value[len] = 0; | |
70 | return value; | |
71 | } | |
72 | if (comment) | |
73 | continue; | |
74 | if (isspace(c) && !quote) { | |
75 | space = 1; | |
76 | continue; | |
77 | } | |
78 | if (!quote) { | |
79 | if (c == ';' || c == '#') { | |
80 | comment = 1; | |
81 | continue; | |
82 | } | |
83 | } | |
84 | if (space) { | |
85 | if (len) | |
86 | value[len++] = ' '; | |
87 | space = 0; | |
88 | } | |
89 | if (c == '\\') { | |
90 | c = get_next_char(); | |
91 | switch (c) { | |
92 | case '\n': | |
93 | continue; | |
94 | case 't': | |
95 | c = '\t'; | |
96 | break; | |
97 | case 'b': | |
98 | c = '\b'; | |
99 | break; | |
100 | case 'n': | |
101 | c = '\n'; | |
102 | break; | |
103 | /* Some characters escape as themselves */ | |
104 | case '\\': case '"': | |
105 | break; | |
106 | /* Reject unknown escape sequences */ | |
107 | default: | |
108 | return NULL; | |
109 | } | |
110 | value[len++] = c; | |
111 | continue; | |
112 | } | |
113 | if (c == '"') { | |
114 | quote = 1-quote; | |
115 | continue; | |
116 | } | |
117 | value[len++] = c; | |
118 | } | |
119 | } | |
120 | ||
121 | static inline int iskeychar(int c) | |
122 | { | |
8dc7c651 | 123 | return isalnum(c) || c == '-' || c == '_'; |
07800601 IM |
124 | } |
125 | ||
126 | static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) | |
127 | { | |
128 | int c; | |
129 | char *value; | |
130 | ||
131 | /* Get the full name */ | |
132 | for (;;) { | |
133 | c = get_next_char(); | |
134 | if (config_file_eof) | |
135 | break; | |
136 | if (!iskeychar(c)) | |
137 | break; | |
45de34bb | 138 | name[len++] = c; |
07800601 IM |
139 | if (len >= MAXNAME) |
140 | return -1; | |
141 | } | |
142 | name[len] = 0; | |
143 | while (c == ' ' || c == '\t') | |
144 | c = get_next_char(); | |
145 | ||
146 | value = NULL; | |
147 | if (c != '\n') { | |
148 | if (c != '=') | |
149 | return -1; | |
150 | value = parse_value(); | |
151 | if (!value) | |
152 | return -1; | |
153 | } | |
154 | return fn(name, value, data); | |
155 | } | |
156 | ||
157 | static int get_extended_base_var(char *name, int baselen, int c) | |
158 | { | |
159 | do { | |
160 | if (c == '\n') | |
161 | return -1; | |
162 | c = get_next_char(); | |
163 | } while (isspace(c)); | |
164 | ||
165 | /* We require the format to be '[base "extension"]' */ | |
166 | if (c != '"') | |
167 | return -1; | |
168 | name[baselen++] = '.'; | |
169 | ||
170 | for (;;) { | |
83a0944f IM |
171 | int ch = get_next_char(); |
172 | ||
173 | if (ch == '\n') | |
07800601 | 174 | return -1; |
83a0944f | 175 | if (ch == '"') |
07800601 | 176 | break; |
83a0944f IM |
177 | if (ch == '\\') { |
178 | ch = get_next_char(); | |
179 | if (ch == '\n') | |
07800601 IM |
180 | return -1; |
181 | } | |
83a0944f | 182 | name[baselen++] = ch; |
07800601 IM |
183 | if (baselen > MAXNAME / 2) |
184 | return -1; | |
185 | } | |
186 | ||
187 | /* Final ']' */ | |
188 | if (get_next_char() != ']') | |
189 | return -1; | |
190 | return baselen; | |
191 | } | |
192 | ||
193 | static int get_base_var(char *name) | |
194 | { | |
195 | int baselen = 0; | |
196 | ||
197 | for (;;) { | |
198 | int c = get_next_char(); | |
199 | if (config_file_eof) | |
200 | return -1; | |
201 | if (c == ']') | |
202 | return baselen; | |
203 | if (isspace(c)) | |
204 | return get_extended_base_var(name, baselen, c); | |
205 | if (!iskeychar(c) && c != '.') | |
206 | return -1; | |
207 | if (baselen > MAXNAME / 2) | |
208 | return -1; | |
209 | name[baselen++] = tolower(c); | |
210 | } | |
211 | } | |
212 | ||
213 | static int perf_parse_file(config_fn_t fn, void *data) | |
214 | { | |
215 | int comment = 0; | |
216 | int baselen = 0; | |
217 | static char var[MAXNAME]; | |
218 | ||
219 | /* U+FEFF Byte Order Mark in UTF8 */ | |
220 | static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf"; | |
221 | const unsigned char *bomptr = utf8_bom; | |
222 | ||
223 | for (;;) { | |
224 | int c = get_next_char(); | |
225 | if (bomptr && *bomptr) { | |
226 | /* We are at the file beginning; skip UTF8-encoded BOM | |
227 | * if present. Sane editors won't put this in on their | |
228 | * own, but e.g. Windows Notepad will do it happily. */ | |
229 | if ((unsigned char) c == *bomptr) { | |
230 | bomptr++; | |
231 | continue; | |
232 | } else { | |
233 | /* Do not tolerate partial BOM. */ | |
234 | if (bomptr != utf8_bom) | |
235 | break; | |
236 | /* No BOM at file beginning. Cool. */ | |
237 | bomptr = NULL; | |
238 | } | |
239 | } | |
240 | if (c == '\n') { | |
241 | if (config_file_eof) | |
242 | return 0; | |
243 | comment = 0; | |
244 | continue; | |
245 | } | |
246 | if (comment || isspace(c)) | |
247 | continue; | |
248 | if (c == '#' || c == ';') { | |
249 | comment = 1; | |
250 | continue; | |
251 | } | |
252 | if (c == '[') { | |
253 | baselen = get_base_var(var); | |
254 | if (baselen <= 0) | |
255 | break; | |
256 | var[baselen++] = '.'; | |
257 | var[baselen] = 0; | |
258 | continue; | |
259 | } | |
260 | if (!isalpha(c)) | |
261 | break; | |
262 | var[baselen] = tolower(c); | |
263 | if (get_value(fn, data, var, baselen+1) < 0) | |
264 | break; | |
265 | } | |
266 | die("bad config file line %d in %s", config_linenr, config_file_name); | |
267 | } | |
268 | ||
269 | static int parse_unit_factor(const char *end, unsigned long *val) | |
270 | { | |
271 | if (!*end) | |
272 | return 1; | |
273 | else if (!strcasecmp(end, "k")) { | |
274 | *val *= 1024; | |
275 | return 1; | |
276 | } | |
277 | else if (!strcasecmp(end, "m")) { | |
278 | *val *= 1024 * 1024; | |
279 | return 1; | |
280 | } | |
281 | else if (!strcasecmp(end, "g")) { | |
282 | *val *= 1024 * 1024 * 1024; | |
283 | return 1; | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int perf_parse_long(const char *value, long *ret) | |
289 | { | |
290 | if (value && *value) { | |
291 | char *end; | |
292 | long val = strtol(value, &end, 0); | |
293 | unsigned long factor = 1; | |
294 | if (!parse_unit_factor(end, &factor)) | |
295 | return 0; | |
296 | *ret = val * factor; | |
297 | return 1; | |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
07800601 IM |
302 | static void die_bad_config(const char *name) |
303 | { | |
304 | if (config_file_name) | |
305 | die("bad config value for '%s' in %s", name, config_file_name); | |
306 | die("bad config value for '%s'", name); | |
307 | } | |
308 | ||
309 | int perf_config_int(const char *name, const char *value) | |
310 | { | |
311 | long ret = 0; | |
312 | if (!perf_parse_long(value, &ret)) | |
313 | die_bad_config(name); | |
314 | return ret; | |
315 | } | |
316 | ||
a41794cd | 317 | static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool) |
07800601 IM |
318 | { |
319 | *is_bool = 1; | |
320 | if (!value) | |
321 | return 1; | |
322 | if (!*value) | |
323 | return 0; | |
324 | if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on")) | |
325 | return 1; | |
326 | if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off")) | |
327 | return 0; | |
328 | *is_bool = 0; | |
329 | return perf_config_int(name, value); | |
330 | } | |
331 | ||
332 | int perf_config_bool(const char *name, const char *value) | |
333 | { | |
334 | int discard; | |
335 | return !!perf_config_bool_or_int(name, value, &discard); | |
336 | } | |
337 | ||
45de34bb SE |
338 | const char *perf_config_dirname(const char *name, const char *value) |
339 | { | |
340 | if (!name) | |
341 | return NULL; | |
342 | return value; | |
343 | } | |
344 | ||
f37a291c | 345 | static int perf_default_core_config(const char *var __used, const char *value __used) |
07800601 | 346 | { |
395cf969 | 347 | /* Add other config variables here. */ |
07800601 IM |
348 | return 0; |
349 | } | |
350 | ||
f37a291c | 351 | int perf_default_config(const char *var, const char *value, void *dummy __used) |
07800601 IM |
352 | { |
353 | if (!prefixcmp(var, "core.")) | |
354 | return perf_default_core_config(var, value); | |
355 | ||
395cf969 | 356 | /* Add other config variables here. */ |
07800601 IM |
357 | return 0; |
358 | } | |
359 | ||
a41794cd | 360 | static int perf_config_from_file(config_fn_t fn, const char *filename, void *data) |
07800601 IM |
361 | { |
362 | int ret; | |
363 | FILE *f = fopen(filename, "r"); | |
364 | ||
365 | ret = -1; | |
366 | if (f) { | |
367 | config_file = f; | |
368 | config_file_name = filename; | |
369 | config_linenr = 1; | |
370 | config_file_eof = 0; | |
371 | ret = perf_parse_file(fn, data); | |
372 | fclose(f); | |
373 | config_file_name = NULL; | |
374 | } | |
375 | return ret; | |
376 | } | |
377 | ||
a41794cd | 378 | static const char *perf_etc_perfconfig(void) |
07800601 IM |
379 | { |
380 | static const char *system_wide; | |
381 | if (!system_wide) | |
382 | system_wide = system_path(ETC_PERFCONFIG); | |
383 | return system_wide; | |
384 | } | |
385 | ||
386 | static int perf_env_bool(const char *k, int def) | |
387 | { | |
388 | const char *v = getenv(k); | |
389 | return v ? perf_config_bool(k, v) : def; | |
390 | } | |
391 | ||
a41794cd | 392 | static int perf_config_system(void) |
07800601 IM |
393 | { |
394 | return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0); | |
395 | } | |
396 | ||
a41794cd | 397 | static int perf_config_global(void) |
07800601 IM |
398 | { |
399 | return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0); | |
400 | } | |
401 | ||
402 | int perf_config(config_fn_t fn, void *data) | |
403 | { | |
404 | int ret = 0, found = 0; | |
07800601 IM |
405 | const char *home = NULL; |
406 | ||
407 | /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */ | |
408 | if (config_exclusive_filename) | |
409 | return perf_config_from_file(fn, config_exclusive_filename, data); | |
410 | if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) { | |
411 | ret += perf_config_from_file(fn, perf_etc_perfconfig(), | |
412 | data); | |
413 | found += 1; | |
414 | } | |
415 | ||
416 | home = getenv("HOME"); | |
417 | if (perf_config_global() && home) { | |
418 | char *user_config = strdup(mkpath("%s/.perfconfig", home)); | |
069e3725 ACM |
419 | struct stat st; |
420 | ||
421 | if (user_config == NULL) { | |
422 | warning("Not enough memory to process %s/.perfconfig, " | |
423 | "ignoring it.", home); | |
424 | goto out; | |
425 | } | |
426 | ||
427 | if (stat(user_config, &st) < 0) | |
428 | goto out_free; | |
429 | ||
430 | if (st.st_uid && (st.st_uid != geteuid())) { | |
431 | warning("File %s not owned by current user or root, " | |
432 | "ignoring it.", user_config); | |
433 | goto out_free; | |
07800601 | 434 | } |
069e3725 ACM |
435 | |
436 | if (!st.st_size) | |
437 | goto out_free; | |
438 | ||
439 | ret += perf_config_from_file(fn, user_config, data); | |
440 | found += 1; | |
441 | out_free: | |
07800601 IM |
442 | free(user_config); |
443 | } | |
069e3725 | 444 | out: |
07800601 IM |
445 | if (found == 0) |
446 | return -1; | |
447 | return ret; | |
448 | } | |
449 | ||
07800601 IM |
450 | /* |
451 | * Call this to report error for your variable that should not | |
452 | * get a boolean value (i.e. "[my] var" means "true"). | |
453 | */ | |
454 | int config_error_nonbool(const char *var) | |
455 | { | |
456 | return error("Missing value for '%s'", var); | |
457 | } | |
45de34bb SE |
458 | |
459 | struct buildid_dir_config { | |
460 | char *dir; | |
461 | }; | |
462 | ||
463 | static int buildid_dir_command_config(const char *var, const char *value, | |
464 | void *data) | |
465 | { | |
466 | struct buildid_dir_config *c = data; | |
467 | const char *v; | |
468 | ||
469 | /* same dir for all commands */ | |
470 | if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) { | |
471 | v = perf_config_dirname(var, value); | |
472 | if (!v) | |
473 | return -1; | |
474 | strncpy(c->dir, v, MAXPATHLEN-1); | |
475 | c->dir[MAXPATHLEN-1] = '\0'; | |
476 | } | |
477 | return 0; | |
478 | } | |
479 | ||
480 | static void check_buildid_dir_config(void) | |
481 | { | |
482 | struct buildid_dir_config c; | |
483 | c.dir = buildid_dir; | |
484 | perf_config(buildid_dir_command_config, &c); | |
485 | } | |
486 | ||
487 | void set_buildid_dir(void) | |
488 | { | |
489 | buildid_dir[0] = '\0'; | |
490 | ||
491 | /* try config file */ | |
492 | check_buildid_dir_config(); | |
493 | ||
494 | /* default to $HOME/.debug */ | |
495 | if (buildid_dir[0] == '\0') { | |
496 | char *v = getenv("HOME"); | |
497 | if (v) { | |
498 | snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s", | |
499 | v, DEBUG_CACHE_DIR); | |
500 | } else { | |
501 | strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1); | |
502 | } | |
503 | buildid_dir[MAXPATHLEN-1] = '\0'; | |
504 | } | |
505 | /* for communicating with external commands */ | |
506 | setenv("PERF_BUILDID_DIR", buildid_dir, 1); | |
507 | } |