1 #define _FILE_OFFSET_BITS 64
2 #define _LARGEFILE_SOURCE
3 #define _LARGEFILE64_SOURCE
16 #include <sys/param.h>
17 #include <sys/types.h>
25 #define S_ISLNK(mode) (((mode) & (_S_IFMT)) == (_S_IFLNK))
32 #define progver "%s: scan/change symbolic links - v1.3 - by Mark Lord\n\n"
33 static char *progname;
34 static int verbose = 0, fix_links = 0, recurse = 0, delete = 0, shorten = 0,
35 testing = 0, single_fs = 1;
38 * tidypath removes excess slashes and "." references from a path string
41 static int substr (char *s, char *old, char *new)
44 int oldlen = strlen(old), newlen = 0;
46 if (NULL == strstr(s, old))
52 if (newlen > oldlen) {
53 if ((tmp = malloc(strlen(s))) == NULL) {
54 fprintf(stderr, "no memory\n");
59 while (NULL != (s = strstr(s, old))) {
64 old_s = strcpy(tmp, s);
70 while ((*s++ = *p++));
78 static int tidy_path (char *path)
83 s = path + strlen(path) - 1;
84 if (s[0] != '/') { /* tmp trailing slash simplifies things */
88 while (substr(path, "/./", "/"))
90 while (substr(path, "//", "/"))
93 while ((p = strstr(path,"/../")) != NULL) {
95 for (p--; p != path; p--) if (*p == '/') break;
98 while ((*p++ = *s++));
103 p = path + strlen(path) - 1;
104 if (p != path && *p == '/')
105 *p-- = '\0'; /* remove tmp trailing slash */
106 while (p != path && *p == '/') { /* remove any others */
110 while (!strncmp(path,"./",2)) {
111 for (p = path, s = path+2; (*p++ = *s++););
117 static int shorten_path (char *path, char *abspath)
119 static char dir[PATH_MAX];
123 /* get rid of unnecessary "../dir" sequences */
124 while (abspath && strlen(abspath) > 1 && (p = strstr(path,"../"))) {
125 /* find innermost occurance of "../dir", and save "dir" */
127 char *a, *s, *d = dir;
128 while ((s = strstr(p+3, "../"))) {
134 while (*s && *s != '/')
138 if (!strcmp(dir,"//"))
140 /* note: p still points at ../dir */
141 if (*s != '/' || !*++s)
143 a = abspath + strlen(abspath) - 1;
144 while (slashes-- > 0) {
147 while (*--a != '/') {
152 if (strncmp(dir, a, strlen(dir)))
154 while ((*p++ = *s++)); /* delete the ../dir */
162 static void fix_symlink (char *path, dev_t my_dev)
164 static char lpath[PATH_MAX], new[PATH_MAX], abspath[PATH_MAX];
165 char *p, *np, *lp, *tail, *msg;
166 struct stat stbuf, lstbuf;
167 int c, fix_abs = 0, fix_messy = 0, fix_long = 0;
169 if ((c = readlink(path, lpath, sizeof(lpath))) == -1) {
173 lpath[c] = '\0'; /* readlink does not null terminate it */
175 /* construct the absolute address of the link */
177 if (lpath[0] != '/') {
178 strcat(abspath,path);
180 if ((c > 0) && (abspath[c-1] == '/'))
181 abspath[c-1] = '\0'; /* cut trailing / */
182 if ((p = strrchr(abspath,'/')) != NULL)
183 *p = '\0'; /* cut last component */
186 strcat(abspath,lpath);
187 (void) tidy_path(abspath);
189 /* check for various things */
190 if (stat(abspath, &stbuf) == -1) {
191 printf("dangling: %s -> %s\n", path, lpath);
196 printf("deleted: %s -> %s\n", path, lpath);
202 lstat(abspath, &lstbuf); /* if the above didn't fail, then this shouldn't */
204 if (single_fs && lstbuf.st_dev != my_dev) {
206 } else if (lpath[0] == '/') {
209 } else if (verbose) {
213 fix_messy = tidy_path(strcpy(new,lpath));
215 fix_long = shorten_path(new, path);
223 printf("%s %s -> %s\n", msg, path, lpath);
224 if (!(fix_links || testing) || !(fix_messy || fix_abs || fix_long))
228 /* convert an absolute link to relative: */
229 /* point tail at first part of lpath that differs from path */
230 /* point p at first part of path that differs from lpath */
231 (void) tidy_path(lpath);
234 while (*p && (*p == *lp)) {
241 /* now create new, with "../"s followed by tail */
248 while (*p == '/') ++p;
252 (void) tidy_path(new);
253 if (shorten) (void) shorten_path(new, path);
255 shorten_path(new,path);
261 if (symlink(new, path)) {
266 printf("changed: %s -> %s\n", path, new);
269 static void dirwalk (char *path, int pathlen, dev_t dev)
273 static struct stat st;
274 static struct dirent *dp;
276 if ((dfd = opendir(path)) == NULL) {
281 name = path + pathlen;
282 if (*(name-1) != '/')
285 while ((dp = readdir(dfd)) != NULL ) {
286 strcpy(name, dp->d_name);
287 if (strcmp(name, ".") && strcmp(name,"..")) {
288 if (lstat(path, &st) == -1) {
290 } else if (st.st_dev == dev) {
291 if (S_ISLNK(st.st_mode)) {
292 fix_symlink (path, dev);
293 } else if (recurse && S_ISDIR(st.st_mode)) {
294 dirwalk(path, strlen(path), dev);
300 path[pathlen] = '\0';
303 static void usage_error (void)
305 fprintf(stderr, progver, progname);
306 fprintf(stderr, "Usage:\t%s [-cdorstv] LINK|DIR ...\n\n", progname);
307 fprintf(stderr, "Flags:"
308 "\t-c == change absolute/messy links to relative\n"
309 "\t-d == delete dangling links\n"
310 "\t-o == warn about links across file systems\n"
311 "\t-r == recurse into subdirs\n"
312 "\t-s == shorten lengthy links (displayed in output only when -c not specified)\n"
313 "\t-t == show what would be done by -c\n"
314 "\t-v == verbose (show all symlinks)\n\n");
318 int main(int argc, char **argv)
320 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
321 static char path[PATH_MAX+2];
322 char* cwd = get_current_dir_name();
324 static char path[PATH_MAX+2], cwd[PATH_MAX+2];
329 if ((progname = (char *) strrchr(*argv, '/')) == NULL)
334 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
336 fprintf(stderr,"get_current_dir_name() failed\n");
338 if (NULL == getcwd(cwd,PATH_MAX)) {
339 fprintf(stderr,"getcwd() failed\n");
343 #if defined (_GNU_SOURCE) && defined (__GLIBC__)
344 cwd = realloc(cwd, strlen(cwd)+2);
346 fprintf(stderr, "realloc() failed\n");
350 if (!*cwd || cwd[strlen(cwd)-1] != '/')
359 if (c == 'c') fix_links = 1;
360 else if (c == 'd') delete = 1;
361 else if (c == 'o') single_fs = 0;
362 else if (c == 'r') recurse = 1;
363 else if (c == 's') shorten = 1;
364 else if (c == 't') testing = 1;
365 else if (c == 'v') verbose = 1;
374 tidy_path(strcat(path, p));
375 if (lstat(path, &st) == -1)
377 else if (S_ISLNK(st.st_mode))
378 fix_symlink(path, st.st_dev);
380 dirwalk(path, strlen(path), st.st_dev);