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authorRob Landley <rob@landley.net>2012-11-20 09:21:52 -0600
committerRob Landley <rob@landley.net>2012-11-20 09:21:52 -0600
commitbd2e2279d2b8f491ff9a56f6bd9000b0215778f8 (patch)
tree48d787551e5525e4cc173045e3ce8b3ab5a50031 /lib/lib.c
parentdb0fff3f849097a20641a15a8f39e5ea67402e9b (diff)
downloadtoybox-bd2e2279d2b8f491ff9a56f6bd9000b0215778f8.tar.gz
Update readlink so -f works. Add -menq while there.
Diffstat (limited to 'lib/lib.c')
-rw-r--r--lib/lib.c63
1 files changed, 24 insertions, 39 deletions
diff --git a/lib/lib.c b/lib/lib.c
index 49f2be5e..83b9bb2e 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -323,52 +323,37 @@ void xstat(char *path, struct stat *st)
if(stat(path, st)) perror_exit("Can't stat %s", path);
}
-// Cannonicalizes path by removing ".", "..", and "//" elements. This is not
-// the same as realpath(), where "dir/.." could wind up somewhere else by
-// following symlinks.
-char *xabspath(char *path)
+// Cannonicalize path, even to file with one or more missing components at end
+char *xabspath(char *path, unsigned missing)
{
- char *from, *to;
+ char *apath, *temp, *slash;
+ int i=0;
// If this isn't an absolute path, make it one with cwd.
if (path[0]!='/') {
- char *cwd=xgetcwd();
- path = xmsprintf("%s/%s", cwd, path);
- free(cwd);
- } else path = xstrdup(path);
-
- // Loop through path elements
- from = to = path;
- while (*from) {
-
- // Continue any current path component.
- if (*from!='/') {
- *(to++) = *(from++);
- continue;
- }
+ char *temp=xgetcwd();
+ apath = xmsprintf("%s/%s", temp, path);
+ free(temp);
+ } else apath = path;
+ slash = apath+strlen(apath);
- // Skip duplicate slashes.
- while (*from=='/') from++;
-
- // Start of a new filename. Handle . and ..
- while (*from=='.') {
- // Skip .
- if (from[1]=='/') from += 2;
- else if (!from[1]) from++;
- // Back up for ..
- else if (from[1]=='.') {
- if (from[2]=='/') from +=3;
- else if(!from[2]) from+=2;
- else break;
- while (to>path && *(--to)!='/');
- } else break;
- }
- // Add directory separator slash.
- *(to++) = '/';
+ for (;;) {
+ temp = realpath(apath, NULL);
+ if (i) *slash = '/';
+ if (temp || ++i > missing) break;
+ while (slash>apath) if (*--slash == '/') break;
+ *slash=0;
+ free(temp);
+ }
+
+ if (i && temp) {
+ slash = xmsprintf("%s%s", temp, slash);
+ free(temp);
+ temp = slash;
}
- *to = 0;
- return path;
+ if (path != apath) free(apath);
+ return temp;
}
// Resolve all symlinks, returning malloc() memory.