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Revision 449 - (show annotations)
Tue Aug 11 17:23:20 2009 UTC (9 years, 11 months ago) by siliconforks
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File size: 13894 byte(s)
Update --version output.
1 /*
2 util.c - general purpose utility routines
3 Copyright (C) 2007, 2008, 2009 siliconforks.com
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #define _GNU_SOURCE
21
22 #include <config.h>
23
24 #include "util.h"
25
26 #include <assert.h>
27 #include <errno.h>
28 #include <limits.h>
29 #include <stdarg.h>
30 #include <stdio.h>
31 #include <stdint.h>
32 #include <string.h>
33 #include <strings.h>
34
35 #include <dirent.h>
36 #include <libgen.h>
37 #include <sys/stat.h>
38 #include <sys/types.h>
39 #include <unistd.h>
40
41 const char * program = NULL;
42
43 void fatal(const char * format, ...) {
44 fprintf(stderr, "%s: ", program);
45 va_list ap;
46 va_start(ap, format);
47 vfprintf(stderr, format, ap);
48 va_end(ap);
49 fputc('\n', stderr);
50 exit(EXIT_FAILURE);
51 }
52
53 void fatal_command_line(const char * format, ...) {
54 fprintf(stderr, "%s: ", program);
55 va_list ap;
56 va_start(ap, format);
57 vfprintf(stderr, format, ap);
58 va_end(ap);
59 fputc('\n', stderr);
60 fprintf(stderr, "Try `%s --help' for more information.\n", program);
61 exit(EXIT_FAILURE);
62 }
63
64 void fatal_source(const char * source_file, unsigned int line_number, const char * format, ...) {
65 fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
66 va_list ap;
67 va_start(ap, format);
68 vfprintf(stderr, format, ap);
69 va_end(ap);
70 fputc('\n', stderr);
71 exit(EXIT_FAILURE);
72 }
73
74 void warn_source(const char * source_file, unsigned int line_number, const char * format, ...) {
75 fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
76 va_list ap;
77 va_start(ap, format);
78 vfprintf(stderr, format, ap);
79 va_end(ap);
80 fputc('\n', stderr);
81 }
82
83 void version(void) {
84 printf("%s %s\n", program, VERSION);
85 printf("Character encoding support: ");
86 #if HAVE_ICONV
87 printf("iconv\n");
88 #elif HAVE_MULTIBYTETOWIDECHAR
89 printf("MultiByteToWideChar\n");
90 #else
91 printf("none\n");
92 #endif
93 printf("Copyright (C) 2009 siliconforks.com\n");
94 printf("License GPLv2+: GNU GPL version 2 or later <http://siliconforks.com/jscoverage/license.html>\n");
95 printf("This is free software: you are free to change and redistribute it.\n");
96 printf("There is NO WARRANTY, to the extent permitted by law.\n");
97 exit(EXIT_SUCCESS);
98 }
99
100 size_t addst(size_t x, size_t y) {
101 if (SIZE_MAX - x < y) {
102 fatal("integer overflow");
103 }
104 return x + y;
105 }
106
107 size_t mulst(size_t x, size_t y) {
108 if (x == 0 || y == 0) {
109 return 0;
110 }
111 if (SIZE_MAX / x < y) {
112 fatal("integer overflow");
113 }
114 return x * y;
115 }
116
117 void * xmalloc(size_t size) {
118 void * result = malloc(size);
119 if (result == NULL) {
120 fatal("out of memory");
121 }
122 return result;
123 }
124
125 void * xrealloc(void * p, size_t size) {
126 void * result = realloc(p, size);
127 if (result == NULL) {
128 fatal("out of memory");
129 }
130 return result;
131 }
132
133 char * xstrdup(const char * s) {
134 char * result = strdup(s);
135 if (result == NULL) {
136 fatal("out of memory");
137 }
138 return result;
139 }
140
141 char * xstrndup(const char * s, size_t size) {
142 char * result = strndup(s, size);
143 if (result == NULL) {
144 fatal("out of memory");
145 }
146 return result;
147 }
148
149 int xasprintf(char ** s, const char * template, ...) {
150 va_list a;
151 va_start(a, template);
152 int result = vasprintf(s, template, a);
153 va_end(a);
154 if (result < 0) {
155 fatal("out of memory");
156 }
157 return result;
158 }
159
160 char * xgetcwd(void) {
161 char * result = getcwd(NULL, 0);
162 if (result == NULL) {
163 fatal("out of memory");
164 }
165 return result;
166 }
167
168 FILE * xfopen(const char * file, const char * mode) {
169 FILE * result = fopen(file, mode);
170 if (result == NULL) {
171 fatal("cannot open file: %s", file);
172 }
173 return result;
174 }
175
176 DIR * xopendir(const char * directory) {
177 DIR * result = opendir(directory);
178 if (result == NULL) {
179 fatal("cannot open directory: %s", directory);
180 }
181 return result;
182 }
183
184 void xlstat(const char * file, struct stat * buf) {
185 #ifdef _WIN32
186 return xstat(file, buf);
187 #else
188 if (lstat(file, buf) == -1) {
189 fatal("cannot stat file: %s", file);
190 }
191 #endif
192 }
193
194 void xstat(const char * file, struct stat * buf) {
195 if (stat(file, buf) == -1) {
196 fatal("cannot stat file: %s", file);
197 }
198 }
199
200 void xmkdir(const char * directory) {
201 int result;
202 #ifdef _WIN32
203 result = mkdir(directory);
204 #else
205 result = mkdir(directory, 0755);
206 #endif
207 if (result == -1) {
208 fatal("cannot create directory: %s", directory);
209 }
210 }
211
212 void mkdir_if_necessary(const char * directory) {
213 struct stat buf;
214 if (stat(directory, &buf) == 0) {
215 if (! S_ISDIR(buf.st_mode)) {
216 fatal("not a directory: %s", directory);
217 }
218 }
219 else {
220 if (errno == ENOENT) {
221 xmkdir(directory);
222 }
223 else {
224 fatal("cannot stat directory: %s", directory);
225 }
226 }
227 }
228
229 void mkdirs(const char * directory) {
230 char * d = xmalloc(strlen(directory) + 1);
231 for (const char * p = directory; *p != '\0'; p++) {
232 if (*p == '/' && p > directory) {
233 strncpy(d, directory, p - directory);
234 d[p - directory] = '\0';
235 mkdir_if_necessary(d);
236 }
237 }
238 mkdir_if_necessary(directory);
239 free(d);
240 }
241
242 void xchdir(const char * directory) {
243 if (chdir(directory) == -1) {
244 fatal("cannot change directory: %s", directory);
245 }
246 }
247
248 bool str_starts_with(const char * string, const char * prefix) {
249 const char * string_ptr = string;
250 const char * prefix_ptr = prefix;
251 while (*string_ptr != '\0' && *prefix_ptr != '\0') {
252 if (*string_ptr != *prefix_ptr) {
253 return false;
254 }
255 string_ptr++;
256 prefix_ptr++;
257 }
258 if (*string_ptr == '\0' && *prefix_ptr != '\0') {
259 return false;
260 }
261 return true;
262 }
263
264 bool str_ends_with(const char * string, const char * suffix) {
265 size_t string_length = strlen(string);
266 size_t suffix_length = strlen(suffix);
267 if (string_length < suffix_length) {
268 return false;
269 }
270 return strcmp(string + string_length - suffix_length, suffix) == 0;
271 }
272
273 static int is_slash(char c) {
274 #ifdef _WIN32
275 return c == '/' || c == '\\';
276 #else
277 return c == '/';
278 #endif
279 }
280
281 char * make_path(const char * parent, const char * relative_path) {
282 size_t parent_length = strlen(parent);
283 size_t relative_path_length = strlen(relative_path);
284 assert(parent_length > 0);
285 assert(relative_path_length > 0);
286 size_t result_length = addst(parent_length, relative_path_length);
287 int parent_ends_with_slash = is_slash(parent[parent_length - 1]);
288 if (parent_ends_with_slash) {
289 result_length = addst(result_length, 1);
290 }
291 else {
292 result_length = addst(result_length, 2);
293 }
294 char * result = xmalloc(result_length);
295 strcpy(result, parent);
296 char * p = result + parent_length;
297 if (! parent_ends_with_slash) {
298 *p = '/';
299 ++p;
300 }
301 strcpy(p, relative_path);
302 return result;
303 }
304
305 char * make_canonical_path(const char * relative_path) {
306 char * original_directory = xgetcwd();
307 char * base = make_basename(relative_path);
308 char * dir = make_dirname(relative_path);
309
310 xchdir(dir);
311 char * canonical_dir = xgetcwd();
312 char * result = make_path(canonical_dir, base);
313
314 free(canonical_dir);
315 free(base);
316 free(dir);
317 xchdir(original_directory);
318 free(original_directory);
319
320 return result;
321 }
322
323 char * make_basename(const char * path) {
324 char * copy = xstrdup(path);
325 char * result = xstrdup(basename(copy));
326 free(copy);
327 return result;
328 }
329
330 char * make_dirname(const char * path) {
331 char * copy = xstrdup(path);
332 char * result = xstrdup(dirname(copy));
333 free(copy);
334 return result;
335 }
336
337 int is_same_file(const char * file1, const char * file2) {
338 #ifdef _WIN32
339 #define FILECMP strcasecmp
340 #else
341 #define FILECMP strcmp
342 #endif
343 if (FILECMP(file1, file2) == 0) {
344 return 1;
345 }
346
347 char * canonical1 = make_canonical_path(file1);
348 char * canonical2 = make_canonical_path(file2);
349 int cmp = FILECMP(canonical1, canonical2);
350 free(canonical1);
351 free(canonical2);
352 if (cmp == 0) {
353 return 1;
354 }
355
356 #ifndef _WIN32
357 struct stat buf1;
358 if (stat(file1, &buf1) == -1) {
359 if (errno == ENOENT) {
360 return 0;
361 }
362 else {
363 fatal("cannot stat file: %s", file1);
364 }
365 }
366 struct stat buf2;
367 if (stat(file2, &buf2) == -1) {
368 if (errno == ENOENT) {
369 return 0;
370 }
371 else {
372 fatal("cannot stat file: %s", file2);
373 }
374 }
375 if (buf1.st_dev == buf2.st_dev &&
376 buf1.st_ino == buf2.st_ino) {
377 return 1;
378 }
379 #endif
380 return 0;
381 #undef FILECMP
382 }
383
384 int contains_file(const char * file1, const char * file2) {
385 int result = 0;
386 char * ancestor = make_canonical_path(file1);
387 char * d = make_canonical_path(file2);
388 char * parent = make_dirname(d);
389 while (strcmp(d, parent) != 0) {
390 if (is_same_file(ancestor, parent)) {
391 result = 1;
392 break;
393 }
394 free(d);
395 d = parent;
396 parent = make_dirname(d);
397 }
398 free(d);
399 free(parent);
400 free(ancestor);
401 return result;
402 }
403
404 void copy_stream(FILE * source, FILE * destination) {
405 unsigned char buffer[8192];
406 for (;;) {
407 int bytes_read = fread(buffer, 1, sizeof(buffer), source);
408 if (bytes_read == 0) {
409 break;
410 }
411 fwrite(buffer, 1, bytes_read, destination);
412 }
413 }
414
415 void copy_file(const char * source_file, const char * destination_file) {
416 FILE * source = xfopen(source_file, "rb");
417 FILE * destination = xfopen(destination_file, "wb");
418
419 copy_stream(source, destination);
420
421 #ifndef _WIN32
422 /* copy permissions */
423 struct stat buf;
424 if (fstat(fileno(source), &buf) == -1) {
425 fatal("cannot stat file: %s", source_file);
426 }
427 fchmod(fileno(destination), buf.st_mode);
428 #endif
429
430 fclose(source);
431 fclose(destination);
432 }
433
434 bool directory_is_empty(const char * directory) {
435 bool result = true;
436 DIR * dir = xopendir(directory);
437 struct dirent * e;
438 while ((e = readdir(dir)) != NULL) {
439 if (strcmp(e->d_name, ".") != 0 &&
440 strcmp(e->d_name, "..") != 0) {
441 result = false;
442 break;
443 }
444 }
445 closedir(dir);
446 return result;
447 }
448
449 static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
450 char * directory = directory_wrt_root == NULL? xstrdup(root): make_path(root, directory_wrt_root);
451 DIR * dir = xopendir(directory);
452 struct dirent * e;
453 while ((e = readdir(dir)) != NULL) {
454 if (strcmp(e->d_name, ".") == 0 ||
455 strcmp(e->d_name, "..") == 0) {
456 continue;
457 }
458 char * entry = make_path(directory, e->d_name);
459 char * entry_wrt_root = directory_wrt_root == NULL? xstrdup(e->d_name): make_path(directory_wrt_root, e->d_name);
460 struct stat buf;
461 xlstat(entry, &buf);
462 if (S_ISREG(buf.st_mode)) {
463 struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
464 p->name = entry_wrt_root;
465 p->next = head;
466 head = p;
467 }
468 else if (S_ISDIR(buf.st_mode)) {
469 head = recursive_dir_list(root, entry_wrt_root, head);
470 free(entry_wrt_root);
471 }
472 #ifndef _WIN32
473 else if (S_ISLNK(buf.st_mode)) {
474 /* check what it points to */
475 xstat(entry, &buf);
476 if (S_ISREG(buf.st_mode)) {
477 struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
478 p->name = entry_wrt_root;
479 p->next = head;
480 head = p;
481 }
482 else {
483 fatal("refusing to follow symbolic link: %s", entry);
484 }
485 }
486 #endif
487 else {
488 fatal("unknown file type: %s", entry);
489 }
490 free(entry);
491 }
492 closedir(dir);
493 free(directory);
494 return head;
495 }
496
497 struct DirListEntry * make_recursive_dir_list(const char * directory) {
498 return recursive_dir_list(directory, NULL, NULL);
499 }
500
501 void free_dir_list(struct DirListEntry * list) {
502 while (list != NULL) {
503 struct DirListEntry * next = list->next;
504 free(list->name);
505 free(list);
506 list = next;
507 }
508 }
509
510 #ifndef HAVE_STRNDUP
511 char * strndup(const char * s, size_t size) {
512 size_t length = strlen(s);
513 if (length > size) {
514 char * result = xmalloc(size + 1);
515 strncpy(result, s, size);
516 result[size] = '\0';
517 return result;
518 }
519 else {
520 char * result = xmalloc(length + 1);
521 strcpy(result, s);
522 return result;
523 }
524 }
525 #endif
526
527 #ifndef HAVE_VASPRINTF
528 int vasprintf(char ** s, const char * template, va_list a) {
529 int size = 100;
530 *s = malloc(size);
531 if (*s == NULL) {
532 return -1;
533 }
534
535 va_list copy;
536 va_copy(copy, a);
537 int result = vsnprintf(*s, size, template, copy);
538 if (result >= size) {
539 int new_size = result;
540 if (new_size == INT_MAX) {
541 free(*s);
542 return -1;
543 }
544 new_size++;
545 char * new_s = realloc(*s, new_size);
546 if (new_s == NULL) {
547 free(*s);
548 return -1;
549 }
550 *s = new_s;
551 size = new_size;
552 va_copy(copy, a);
553 result = vsnprintf(*s, size, template, copy);
554 assert(result == size - 1);
555 }
556 else if (result == -1) {
557 while (result == -1) {
558 if (size == INT_MAX) {
559 free(*s);
560 return -1;
561 }
562 int new_size;
563 if (size > INT_MAX / 2) {
564 new_size = INT_MAX;
565 }
566 else {
567 new_size = 2 * size;
568 }
569 char * new_s = realloc(*s, new_size);
570 if (new_s == NULL) {
571 free(*s);
572 return -1;
573 }
574 *s = new_s;
575 size = new_size;
576 va_copy(copy, a);
577 result = vsnprintf(*s, size, template, copy);
578 }
579 assert(result <= size - 1);
580 }
581
582 return result;
583 }
584 #endif
585
586 #ifndef HAVE_ASPRINTF
587 int asprintf(char ** s, const char * template, ...) {
588 va_list a;
589 va_start(a, template);
590 int result = vasprintf(s, template, a);
591 va_end(a);
592 return result;
593 }
594 #endif

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