1 #define _FILE_OFFSET_BITS 64
2 #ifndef _LARGEFILE_SOURCE
3 #define _LARGEFILE_SOURCE
5 #ifndef _LARGEFILE64_SOURCE
6 #define _LARGEFILE64_SOURCE
20 #include <sys/param.h>
21 #include <sys/types.h>
29 #define S_ISLNK(mode) (((mode) & (_S_IFMT)) == (_S_IFLNK))
36 #define progver "%s: scan/change symbolic links - v1.3 - by Mark Lord\n\n"
37 static char *progname;
38 static int verbose = 0, fix_links = 0, recurse = 0, delete = 0, shorten = 0,
39 testing = 0, single_fs = 1;
42 * tidypath removes excess slashes and "." references from a path string
45 static int substr (char *s, char *old, char *new)
48 int oldlen = strlen(old), newlen = 0;
50 if (NULL == strstr(s, old))
56 if (newlen > oldlen) {
57 if ((tmp = malloc(strlen(s))) == NULL) {
58 fprintf(stderr, "no memory\n");
63 while (NULL != (s = strstr(s, old))) {
68 old_s = strcpy(tmp, s);
74 while ((*s++ = *p++));
82 static int tidy_path (char *path)
87 s = path + strlen(path) - 1;
88 if (s[0] != '/') { /* tmp trailing slash simplifies things */
92 while (substr(path, "/./", "/"))
94 while (substr(path, "//", "/"))
97 while ((p = strstr(path,"/../")) != NULL) {
99 for (p--; p != path; p--) if (*p == '/') break;
102 while ((*p++ = *s++));
107 p = path + strlen(path) - 1;
108 if (p != path && *p == '/')
109 *p-- = '\0'; /* remove tmp trailing slash */
110 while (p != path && *p == '/') { /* remove any others */
114 while (!strncmp(path,"./",2)) {
115 for (p = path, s = path+2; (*p++ = *s++););
121 static int shorten_path (char *path, char *abspath)
123 static char dir[PATH_MAX];
127 /* get rid of unnecessary "../dir" sequences */
128 while (abspath && strlen(abspath) > 1 && (p = strstr(path,"../"))) {
129 /* find innermost occurrence of "../dir", and save "dir" */
131 char *a, *s, *d = dir;
132 while ((s = strstr(p+3, "../"))) {
138 while (*s && *s != '/')
142 if (!strcmp(dir,"//"))
144 /* note: p still points at ../dir */
145 if (*s != '/' || !*++s)
147 a = abspath + strlen(abspath) - 1;
148 while (slashes-- > 0) {
151 while (*--a != '/') {
156 if (strncmp(dir, a, strlen(dir)))
158 while ((*p++ = *s++)); /* delete the ../dir */
166 static void fix_symlink (char *path, dev_t my_dev)
168 static char lpath[PATH_MAX], new[PATH_MAX], abspath[PATH_MAX];
169 char *p, *np, *lp, *tail, *msg;
170 struct stat stbuf, lstbuf;
171 int c, fix_abs = 0, fix_messy = 0, fix_long = 0;
173 if ((c = readlink(path, lpath, sizeof(lpath) - 1)) == -1) {
177 lpath[c] = '\0'; /* readlink does not null terminate it */
179 /* construct the absolute address of the link */
181 if (lpath[0] != '/') {
182 strcat(abspath,path);
184 if ((c > 0) && (abspath[c-1] == '/'))
185 abspath[c-1] = '\0'; /* cut trailing / */
186 if ((p = strrchr(abspath,'/')) != NULL)
187 *p = '\0'; /* cut last component */
190 strcat(abspath,lpath);
191 (void) tidy_path(abspath);
193 /* check for various things */
194 if (stat(abspath, &stbuf) == -1) {
195 printf("dangling: %s -> %s\n", path, lpath);
200 printf("deleted: %s -> %s\n", path, lpath);
206 lstat(abspath, &lstbuf); /* if the above didn't fail, then this shouldn't */
208 if (single_fs && lstbuf.st_dev != my_dev) {
210 } else if (lpath[0] == '/') {
213 } else if (verbose) {
217 fix_messy = tidy_path(strcpy(new,lpath));
219 fix_long = shorten_path(new, path);
227 printf("%s %s -> %s\n", msg, path, lpath);
228 if (!(fix_links || testing) || !(fix_messy || fix_abs || fix_long))
232 /* convert an absolute link to relative: */
233 /* point tail at first part of lpath that differs from path */
234 /* point p at first part of path that differs from lpath */
235 (void) tidy_path(lpath);
238 while (*p && (*p == *lp)) {
245 /* now create new, with "../"s followed by tail */
252 while (*p == '/') ++p;
256 (void) tidy_path(new);
257 if (shorten) (void) shorten_path(new, path);
259 shorten_path(new,path);
265 if (symlink(new, path)) {
270 printf("changed: %s -> %s\n", path, new);
273 static void dirwalk (char *path, int pathlen, dev_t dev)
277 static struct stat st;
278 static struct dirent *dp;
280 if ((dfd = opendir(path)) == NULL) {
285 name = path + pathlen;
286 if (*(name-1) != '/')
289 while ((dp = readdir(dfd)) != NULL ) {
290 strcpy(name, dp->d_name);
291 if (strcmp(name, ".") && strcmp(name,"..")) {
292 if (lstat(path, &st) == -1) {
294 } else if (st.st_dev == dev) {
295 if (S_ISLNK(st.st_mode)) {
296 fix_symlink (path, dev);
297 } else if (recurse && S_ISDIR(st.st_mode)) {
298 dirwalk(path, strlen(path), dev);
304 path[pathlen] = '\0';
307 static void usage_error (void)
309 fprintf(stderr, progver, progname);
310 fprintf(stderr, "Usage:\t%s [-cdorstv] LINK|DIR ...\n\n", progname);
311 fprintf(stderr, "Flags:"
312 "\t-c == change absolute/messy links to relative\n"
313 "\t-d == delete dangling links\n"
314 "\t-o == warn about links across file systems\n"
315 "\t-r == recurse into subdirs\n"
316 "\t-s == shorten lengthy links (displayed in output only when -c not specified)\n"
317 "\t-t == show what would be done by -c\n"
318 "\t-v == verbose (show all symlinks)\n\n");
322 int main(int argc, char **argv)
324 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
325 static char path[PATH_MAX+2];
326 char* cwd = get_current_dir_name();
328 static char path[PATH_MAX+2], cwd[PATH_MAX+2];
333 if ((progname = (char *) strrchr(*argv, '/')) == NULL)
338 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
340 fprintf(stderr,"get_current_dir_name() failed\n");
342 if (NULL == getcwd(cwd,PATH_MAX)) {
343 fprintf(stderr,"getcwd() failed\n");
347 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
348 cwd = realloc(cwd, strlen(cwd)+2);
350 fprintf(stderr, "realloc() failed\n");
354 if (!*cwd || cwd[strlen(cwd)-1] != '/')
363 if (c == 'c') fix_links = 1;
364 else if (c == 'd') delete = 1;
365 else if (c == 'o') single_fs = 0;
366 else if (c == 'r') recurse = 1;
367 else if (c == 's') shorten = 1;
368 else if (c == 't') testing = 1;
369 else if (c == 'v') verbose = 1;
378 tidy_path(strcat(path, p));
379 if (lstat(path, &st) == -1)
381 else if (S_ISLNK(st.st_mode))
382 fix_symlink(path, st.st_dev);
384 dirwalk(path, strlen(path), st.st_dev);