1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4
5 /*
6 ** Pathname subroutines.
7 */
8 #if defined(FREEBSD) || defined(BSDI) || defined(DARWIN)
9 #include <sys/types.h>
10 #endif /* FREEBSD */
11 #include <dirent.h>
12 #include <errno.h>
13 #include <stdarg.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <unistd.h>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include "pathsub.h"
21 #ifdef USE_REENTRANT_LIBC
22 #include "libc_r.h"
23 #endif /* USE_REENTRANT_LIBC */
24
25 char *program;
26
27 void
fail(char * format,...)28 fail(char *format, ...)
29 {
30 int error;
31 va_list ap;
32
33 #ifdef USE_REENTRANT_LIBC
34 R_STRERROR_INIT_R();
35 #endif
36
37 error = errno;
38 fprintf(stderr, "%s: ", program);
39 va_start(ap, format);
40 vfprintf(stderr, format, ap);
41 va_end(ap);
42 if (error) {
43
44 #ifdef USE_REENTRANT_LIBC
45 R_STRERROR_R(errno);
46 fprintf(stderr, ": %s", r_strerror_r);
47 #else
48 fprintf(stderr, ": %s", strerror(errno));
49 #endif
50 }
51
52 putc('\n', stderr);
53 abort();
54 exit(1);
55 }
56
57 char *
getcomponent(char * path,char * name)58 getcomponent(char *path, char *name)
59 {
60 if (*path == '\0')
61 return 0;
62 if (*path == '/') {
63 *name++ = '/';
64 } else {
65 do {
66 *name++ = *path++;
67 } while (*path != '/' && *path != '\0');
68 }
69 *name = '\0';
70 while (*path == '/')
71 path++;
72 return path;
73 }
74
75 #ifdef UNIXWARE
76 /* The static buffer in Unixware's readdir is too small. */
readdir(DIR * d)77 struct dirent * readdir(DIR *d)
78 {
79 static struct dirent *buf = NULL;
80 #define MAX_PATH_LEN 1024
81
82 if (buf == NULL)
83 buf = (struct dirent *)xmalloc(sizeof(struct dirent) + MAX_PATH_LEN) ;
84 return readdir_r(d, buf);
85 }
86 #endif
87
88 /* APPARENT BUG - ignores argument "dir", uses ".." instead. */
89 char *
ino2name(ino_t ino,char * dir)90 ino2name(ino_t ino, char *dir)
91 {
92 DIR *dp;
93 struct dirent *ep;
94 char *name;
95
96 dp = opendir(".."); /* XXX */
97 if (!dp)
98 fail("cannot read parent directory");
99 for (;;) {
100 if (!(ep = readdir(dp)))
101 fail("cannot find current directory");
102 if (ep->d_ino == ino)
103 break;
104 }
105 name = xstrdup(ep->d_name);
106 closedir(dp);
107 return name;
108 }
109
110 void *
xmalloc(size_t size)111 xmalloc(size_t size)
112 {
113 void *p;
114
115 if (size <= 0)
116 fail("attempted to allocate %u bytes", size);
117 p = malloc(size);
118 if (!p)
119 fail("cannot allocate %u bytes", size);
120 return p;
121 }
122
123 char *
xstrdup(char * s)124 xstrdup(char *s)
125 {
126 if (!s || !s[0])
127 fail("Null pointer or empty string passed to xstrdup()");
128 return strcpy((char*)xmalloc(strlen(s) + 1), s);
129 }
130
131 char *
xbasename(char * path)132 xbasename(char *path)
133 {
134 char *cp;
135
136 if (!path || !path[0])
137 fail("Null pointer or empty string passed to xbasename()");
138 while ((cp = strrchr(path, '/')) && cp[1] == '\0')
139 *cp = '\0';
140 if (!cp) return path;
141 return cp + 1;
142 }
143
144 void
xchdir(char * dir)145 xchdir(char *dir)
146 {
147 if (!dir || !dir[0])
148 fail("Null pointer or empty string passed to xchdir()");
149 if (chdir(dir) < 0)
150 fail("cannot change directory to %s", dir);
151 }
152
153 int
relatepaths(char * from,char * to,char * outpath)154 relatepaths(char *from, char *to, char *outpath)
155 {
156 char *cp, *cp2;
157 int len;
158 char buf[NAME_MAX];
159
160 if (!from || *from != '/')
161 fail("relatepaths: from path does not start with /");
162 if (!to || *to != '/')
163 fail("relatepaths: to path does not start with /");
164
165 for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
166 if (*cp == '\0')
167 break;
168 while (cp[-1] != '/')
169 cp--, cp2--;
170 if (cp - 1 == to) {
171 /* closest common ancestor is /, so use full pathname */
172 len = strlen(strcpy(outpath, to));
173 if (outpath[len] != '/') {
174 outpath[len++] = '/';
175 outpath[len] = '\0';
176 }
177 } else {
178 len = 0;
179 while ((cp2 = getcomponent(cp2, buf)) != 0) {
180 strcpy(outpath + len, "../");
181 len += 3;
182 }
183 while ((cp = getcomponent(cp, buf)) != 0) {
184 sprintf(outpath + len, "%s/", buf);
185 len += strlen(outpath + len);
186 }
187 }
188 return len;
189 }
190
191 void
reversepath(char * inpath,char * name,int len,char * outpath)192 reversepath(char *inpath, char *name, int len, char *outpath)
193 {
194 char *cp, *cp2;
195 char buf[NAME_MAX];
196 struct stat sb;
197
198 cp = strcpy(outpath + PATH_MAX - (len + 1), name);
199 cp2 = inpath;
200 while ((cp2 = getcomponent(cp2, buf)) != 0) {
201 if (strcmp(buf, ".") == 0)
202 continue;
203 if (strcmp(buf, "..") == 0) {
204 if (stat(".", &sb) < 0)
205 fail("cannot stat current directory");
206 name = ino2name(sb.st_ino, "..");
207 len = strlen(name);
208 cp -= len + 1;
209 strcpy(cp, name);
210 cp[len] = '/';
211 free(name);
212 xchdir("..");
213 } else {
214 cp -= 3;
215 strncpy(cp, "../", 3);
216 xchdir(buf);
217 }
218 }
219 strcpy(outpath, cp);
220 }
221
222 void
diagnosePath(const char * path)223 diagnosePath(const char * path)
224 {
225 char * myPath;
226 char * slash;
227 int rv;
228 struct stat sb;
229 char buf[BUFSIZ];
230
231 if (!path || !path[0])
232 fail("Null pointer or empty string passed to mkdirs()");
233 myPath = strdup(path);
234 if (!myPath)
235 fail("strdup() failed!");
236 do {
237 rv = lstat(myPath, &sb);
238 if (rv < 0) {
239 perror(myPath);
240 } else if (S_ISLNK(sb.st_mode)) {
241 rv = readlink(myPath, buf, sizeof(buf) - 1);
242 if (rv < 0) {
243 perror("readlink");
244 buf[0] = 0;
245 } else {
246 buf[rv] = 0;
247 }
248 fprintf(stderr, "%s is a link to %s\n", myPath, buf);
249 } else if (S_ISDIR(sb.st_mode)) {
250 fprintf(stderr, "%s is a directory\n", myPath);
251 rv = access(myPath, X_OK);
252 if (rv < 0) {
253 fprintf(stderr, "%s: no search permission\n", myPath);
254 }
255 } else {
256 fprintf(stderr, "%s is a file !?!\n", myPath);
257 rv = access(myPath, F_OK);
258 if (rv < 0) {
259 fprintf(stderr, "%s does not exist\n", myPath);
260 }
261 }
262
263 /* chop path off one level. */
264 slash = strrchr(myPath, '/');
265 if (!slash)
266 slash = strrchr(myPath, '\\');
267 if (!slash)
268 slash = myPath;
269 *slash = 0;
270 } while (myPath[0]);
271 free(myPath);
272 }
273