/[jscoverage]/trunk/util.c
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Revision 2 - (hide annotations)
Wed Aug 1 13:51:53 2007 UTC (12 years, 1 month ago) by siliconforks
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Initial import.

1 siliconforks 2 /*
2     util.c - general purpose utility routines
3     Copyright (C) 2007 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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