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