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Revision 87 - (show annotations)
Mon May 5 20:05:27 2008 UTC (10 years, 6 months ago) by siliconforks
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Add 2008 to copyright date.

1 /*
2 util.c - general purpose utility routines
3 Copyright (C) 2007, 2008 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 #include "util.h"
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <stdarg.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <strings.h>
28
29 #include <dirent.h>
30 #include <libgen.h>
31 #include <sys/stat.h>
32 #include <sys/types.h>
33 #include <unistd.h>
34
35 const char * program = NULL;
36
37 void fatal(const char * format, ...) {
38 fprintf(stderr, "%s: ", program);
39 va_list ap;
40 va_start(ap, format);
41 vfprintf(stderr, format, ap);
42 va_end(ap);
43 fputc('\n', stderr);
44 fprintf(stderr, "Try `%s --help' for more information.\n", program);
45 exit(EXIT_FAILURE);
46 }
47
48 void * xmalloc(size_t size) {
49 void * result = malloc(size);
50 if (result == NULL) {
51 fatal("out of memory");
52 }
53 return result;
54 }
55
56 char * xstrdup(const char * s) {
57 char * result = strdup(s);
58 if (result == NULL) {
59 fatal("out of memory");
60 }
61 return result;
62 }
63
64 char * xgetcwd(void) {
65 char * result = getcwd(NULL, 0);
66 if (result == NULL) {
67 fatal("out of memory");
68 }
69 return result;
70 }
71
72 FILE * xfopen(const char * file, const char * mode) {
73 FILE * result = fopen(file, mode);
74 if (result == NULL) {
75 fatal("cannot open file: %s", file);
76 }
77 return result;
78 }
79
80 DIR * xopendir(const char * directory) {
81 DIR * result = opendir(directory);
82 if (result == NULL) {
83 fatal("cannot open directory: %s", directory);
84 }
85 return result;
86 }
87
88 void xlstat(const char * file, struct stat * buf) {
89 #ifdef _WIN32
90 return xstat(file, buf);
91 #else
92 if (lstat(file, buf) == -1) {
93 fatal("cannot stat file: %s", file);
94 }
95 #endif
96 }
97
98 void xstat(const char * file, struct stat * buf) {
99 if (stat(file, buf) == -1) {
100 fatal("cannot stat file: %s", file);
101 }
102 }
103
104 void xmkdir(const char * directory) {
105 int result;
106 #ifdef _WIN32
107 result = mkdir(directory);
108 #else
109 result = mkdir(directory, 0755);
110 #endif
111 if (result == -1) {
112 fatal("cannot create directory: %s", directory);
113 }
114 }
115
116 void mkdir_if_necessary(const char * directory) {
117 struct stat buf;
118 if (stat(directory, &buf) == 0) {
119 if (! S_ISDIR(buf.st_mode)) {
120 fatal("not a directory: %s", directory);
121 }
122 }
123 else {
124 if (errno == ENOENT) {
125 xmkdir(directory);
126 }
127 else {
128 fatal("cannot stat directory: %s", directory);
129 }
130 }
131 }
132
133 void mkdirs(const char * directory) {
134 char * d = xmalloc(strlen(directory) + 1);
135 for (const char * p = directory; *p != '\0'; p++) {
136 if (*p == '/' && p > directory) {
137 strncpy(d, directory, p - directory);
138 d[p - directory] = '\0';
139 mkdir_if_necessary(d);
140 }
141 }
142 mkdir_if_necessary(directory);
143 free(d);
144 }
145
146 void xchdir(const char * directory) {
147 if (chdir(directory) == -1) {
148 fatal("cannot change directory: %s", directory);
149 }
150 }
151
152 char * make_path(const char * parent, const char * relative_path) {
153 size_t parent_length = strlen(parent);
154 size_t relative_path_length = strlen(relative_path);
155 char * result = xmalloc(parent_length + relative_path_length + 2);
156 strcpy(result, parent);
157 result[parent_length] = '/';
158 strcpy(result + parent_length + 1, relative_path);
159 return result;
160 }
161
162 char * make_canonical_path(const char * relative_path) {
163 char * original_directory = xgetcwd();
164 char * base = make_basename(relative_path);
165 char * dir = make_dirname(relative_path);
166
167 xchdir(dir);
168 char * canonical_dir = xgetcwd();
169 char * result = make_path(canonical_dir, base);
170
171 free(canonical_dir);
172 free(base);
173 free(dir);
174 xchdir(original_directory);
175 free(original_directory);
176
177 return result;
178 }
179
180 char * make_basename(const char * path) {
181 char * copy = xstrdup(path);
182 char * result = xstrdup(basename(copy));
183 free(copy);
184 return result;
185 }
186
187 char * make_dirname(const char * path) {
188 char * copy = xstrdup(path);
189 char * result = xstrdup(dirname(copy));
190 free(copy);
191 return result;
192 }
193
194 int is_same_file(const char * file1, const char * file2) {
195 #ifdef _WIN32
196 #define FILECMP strcasecmp
197 #else
198 #define FILECMP strcmp
199 #endif
200 if (FILECMP(file1, file2) == 0) {
201 return 1;
202 }
203
204 char * canonical1 = make_canonical_path(file1);
205 char * canonical2 = make_canonical_path(file2);
206 int cmp = FILECMP(canonical1, canonical2);
207 free(canonical1);
208 free(canonical2);
209 if (cmp == 0) {
210 return 1;
211 }
212
213 #ifndef _WIN32
214 struct stat buf1;
215 if (stat(file1, &buf1) == -1) {
216 if (errno == ENOENT) {
217 return 0;
218 }
219 else {
220 fatal("cannot stat file: %s", file1);
221 }
222 }
223 struct stat buf2;
224 if (stat(file2, &buf2) == -1) {
225 if (errno == ENOENT) {
226 return 0;
227 }
228 else {
229 fatal("cannot stat file: %s", file2);
230 }
231 }
232 if (buf1.st_dev == buf2.st_dev &&
233 buf1.st_ino == buf2.st_ino) {
234 return 1;
235 }
236 #endif
237 return 0;
238 #undef FILECMP
239 }
240
241 int contains_file(const char * file1, const char * file2) {
242 int result = 0;
243 char * ancestor = make_canonical_path(file1);
244 char * d = make_canonical_path(file2);
245 char * parent = make_dirname(d);
246 while (strcmp(d, parent) != 0) {
247 if (is_same_file(ancestor, parent)) {
248 result = 1;
249 break;
250 }
251 free(d);
252 d = parent;
253 parent = make_dirname(d);
254 }
255 free(d);
256 free(parent);
257 free(ancestor);
258 return result;
259 }
260
261 void copy_stream(FILE * source, FILE * destination) {
262 unsigned char buffer[8192];
263 for (;;) {
264 int bytes_read = fread(buffer, 1, sizeof(buffer), source);
265 if (bytes_read == 0) {
266 break;
267 }
268 fwrite(buffer, 1, bytes_read, destination);
269 }
270 }
271
272 void copy_file(const char * source_file, const char * destination_file) {
273 FILE * source = xfopen(source_file, "rb");
274 FILE * destination = xfopen(destination_file, "wb");
275
276 copy_stream(source, destination);
277
278 fclose(source);
279 fclose(destination);
280 }
281
282 int directory_is_empty(const char * directory) {
283 DIR * dir = xopendir(directory);
284 int num_entries = 0;
285 struct dirent * e;
286 while ((e = readdir(dir)) != NULL) {
287 if (strcmp(e->d_name, ".") != 0 &&
288 strcmp(e->d_name, "..") != 0) {
289 num_entries++;
290 }
291 }
292 closedir(dir);
293 return num_entries == 0;
294 }
295
296 static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
297 char * directory = directory_wrt_root == NULL? xstrdup(root): make_path(root, directory_wrt_root);
298 DIR * dir = xopendir(directory);
299 struct dirent * e;
300 while ((e = readdir(dir)) != NULL) {
301 if (strcmp(e->d_name, ".") == 0 ||
302 strcmp(e->d_name, "..") == 0) {
303 continue;
304 }
305 char * entry = make_path(directory, e->d_name);
306 char * entry_wrt_root = directory_wrt_root == NULL? xstrdup(e->d_name): make_path(directory_wrt_root, e->d_name);
307 struct stat buf;
308 xlstat(entry, &buf);
309 if (S_ISREG(buf.st_mode)) {
310 struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
311 p->name = entry_wrt_root;
312 p->next = head;
313 head = p;
314 }
315 else if (S_ISDIR(buf.st_mode)) {
316 head = recursive_dir_list(root, entry_wrt_root, head);
317 free(entry_wrt_root);
318 }
319 else {
320 fatal("unknown file type: %s", entry);
321 }
322 free(entry);
323 }
324 closedir(dir);
325 free(directory);
326 return head;
327 }
328
329 struct DirListEntry * make_recursive_dir_list(const char * directory) {
330 return recursive_dir_list(directory, NULL, NULL);
331 }
332
333 void free_dir_list(struct DirListEntry * list) {
334 while (list != NULL) {
335 struct DirListEntry * next = list->next;
336 free(list->name);
337 free(list);
338 list = next;
339 }
340 }

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