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11#include "util.h"
12#include "cache.h"
13#include "exec_cmd.h"
14
15#define MAXNAME (256)
16
17#define DEBUG_CACHE_DIR ".debug"
18
19
20char buildid_dir[MAXPATHLEN];
21
22static FILE *config_file;
23static const char *config_file_name;
24static int config_linenr;
25static int config_file_eof;
26
27static const char *config_exclusive_filename;
28
29static 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
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
55static char *parse_value(void)
56{
57 static char value[1024];
58 int quote = 0, comment = 0, space = 0;
59 size_t len = 0;
60
61 for (;;) {
62 int c = get_next_char();
63
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
104 case '\\': case '"':
105 break;
106
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
121static inline int iskeychar(int c)
122{
123 return isalnum(c) || c == '-' || c == '_';
124}
125
126static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
127{
128 int c;
129 char *value;
130
131
132 for (;;) {
133 c = get_next_char();
134 if (config_file_eof)
135 break;
136 if (!iskeychar(c))
137 break;
138 name[len++] = c;
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
157static 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
166 if (c != '"')
167 return -1;
168 name[baselen++] = '.';
169
170 for (;;) {
171 int ch = get_next_char();
172
173 if (ch == '\n')
174 return -1;
175 if (ch == '"')
176 break;
177 if (ch == '\\') {
178 ch = get_next_char();
179 if (ch == '\n')
180 return -1;
181 }
182 name[baselen++] = ch;
183 if (baselen > MAXNAME / 2)
184 return -1;
185 }
186
187
188 if (get_next_char() != ']')
189 return -1;
190 return baselen;
191}
192
193static 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
213static 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
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
227
228
229 if ((unsigned char) c == *bomptr) {
230 bomptr++;
231 continue;
232 } else {
233
234 if (bomptr != utf8_bom)
235 break;
236
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
269static 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
288static 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
302static 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
309int 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
317static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
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
332int 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
338const char *perf_config_dirname(const char *name, const char *value)
339{
340 if (!name)
341 return NULL;
342 return value;
343}
344
345static int perf_default_core_config(const char *var __maybe_unused,
346 const char *value __maybe_unused)
347{
348
349 return 0;
350}
351
352int perf_default_config(const char *var, const char *value,
353 void *dummy __maybe_unused)
354{
355 if (!prefixcmp(var, "core."))
356 return perf_default_core_config(var, value);
357
358
359 return 0;
360}
361
362static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
363{
364 int ret;
365 FILE *f = fopen(filename, "r");
366
367 ret = -1;
368 if (f) {
369 config_file = f;
370 config_file_name = filename;
371 config_linenr = 1;
372 config_file_eof = 0;
373 ret = perf_parse_file(fn, data);
374 fclose(f);
375 config_file_name = NULL;
376 }
377 return ret;
378}
379
380static const char *perf_etc_perfconfig(void)
381{
382 static const char *system_wide;
383 if (!system_wide)
384 system_wide = system_path(ETC_PERFCONFIG);
385 return system_wide;
386}
387
388static int perf_env_bool(const char *k, int def)
389{
390 const char *v = getenv(k);
391 return v ? perf_config_bool(k, v) : def;
392}
393
394static int perf_config_system(void)
395{
396 return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
397}
398
399static int perf_config_global(void)
400{
401 return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
402}
403
404int perf_config(config_fn_t fn, void *data)
405{
406 int ret = 0, found = 0;
407 const char *home = NULL;
408
409
410 if (config_exclusive_filename)
411 return perf_config_from_file(fn, config_exclusive_filename, data);
412 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
413 ret += perf_config_from_file(fn, perf_etc_perfconfig(),
414 data);
415 found += 1;
416 }
417
418 home = getenv("HOME");
419 if (perf_config_global() && home) {
420 char *user_config = strdup(mkpath("%s/.perfconfig", home));
421 struct stat st;
422
423 if (user_config == NULL) {
424 warning("Not enough memory to process %s/.perfconfig, "
425 "ignoring it.", home);
426 goto out;
427 }
428
429 if (stat(user_config, &st) < 0)
430 goto out_free;
431
432 if (st.st_uid && (st.st_uid != geteuid())) {
433 warning("File %s not owned by current user or root, "
434 "ignoring it.", user_config);
435 goto out_free;
436 }
437
438 if (!st.st_size)
439 goto out_free;
440
441 ret += perf_config_from_file(fn, user_config, data);
442 found += 1;
443out_free:
444 free(user_config);
445 }
446out:
447 if (found == 0)
448 return -1;
449 return ret;
450}
451
452
453
454
455
456int config_error_nonbool(const char *var)
457{
458 return error("Missing value for '%s'", var);
459}
460
461struct buildid_dir_config {
462 char *dir;
463};
464
465static int buildid_dir_command_config(const char *var, const char *value,
466 void *data)
467{
468 struct buildid_dir_config *c = data;
469 const char *v;
470
471
472 if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
473 v = perf_config_dirname(var, value);
474 if (!v)
475 return -1;
476 strncpy(c->dir, v, MAXPATHLEN-1);
477 c->dir[MAXPATHLEN-1] = '\0';
478 }
479 return 0;
480}
481
482static void check_buildid_dir_config(void)
483{
484 struct buildid_dir_config c;
485 c.dir = buildid_dir;
486 perf_config(buildid_dir_command_config, &c);
487}
488
489void set_buildid_dir(void)
490{
491 buildid_dir[0] = '\0';
492
493
494 check_buildid_dir_config();
495
496
497 if (buildid_dir[0] == '\0') {
498 char *v = getenv("HOME");
499 if (v) {
500 snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
501 v, DEBUG_CACHE_DIR);
502 } else {
503 strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
504 }
505 buildid_dir[MAXPATHLEN-1] = '\0';
506 }
507
508 setenv("PERF_BUILDID_DIR", buildid_dir, 1);
509}
510
