Fix mkdir -p with absolute paths.

Stripping leading / is not the right thing to do there.
Broken when the code moved to lib and was genericized for use elsewhere.

1 files changed, 3 insertions, 6 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 1efb642f..c1029d20 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -135,15 +135,12 @@ int mkpathat(int atfd, char *dir, mode_t lastmode, int flags)
     return 1;
   }
 
-  // Skip leading / of absolute paths
-  while (*dir == '/') dir++;
-
-  for (s=dir; ;s++) {
+  for (s = dir; ;s++) {
     char save = 0;
     mode_t mode = (0777&~toys.old_umask)|0300;
 
-    // Skip leading / of absolute paths.
-    if (*s == '/' && (flags&2)) {
+    // find next '/', but don't try to mkdir "" at start of absolute path
+    if (*s == '/' && (flags&2) && s != dir) {
       save = *s;
       *s = 0;
     } else if (*s) continue;