Fix bug in rename() that occures if new filename starts with the old filename

2 files changed, 28 insertions, 1 deletions

diff --git a/src/library.js b/src/library.js
index cfe83c6e..aaef2f74 100644
--- a/src/library.js
+++ b/src/library.js
@@ -3453,7 +3453,9 @@ LibraryManager.library = {
     } else if (oldObj.isRoot || oldObj.path == FS.currentPath) {
       ___setErrNo(ERRNO_CODES.EBUSY);
       return -1;
-    } else if (newObj.path && newObj.path.indexOf(oldObj.path) == 0) {
+    } else if (newObj.parentPath &&
+               newObj.parentPath.indexOf(oldObj.parentPath) == 0 &&
+               newObj.parentPath != oldObj.parentPath) {
       ___setErrNo(ERRNO_CODES.EINVAL);
       return -1;
     } else if (newObj.exists && newObj.object.isFolder) {
diff --git a/tests/runner.py b/tests/runner.py
index ead85948..838c150d 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -3402,6 +3402,31 @@ Exiting setjmp function, level: 0, prev_jmp: -1
       '''
       self.do_run(src, 'z:1*', force_c=True)
 
+    def test_rename(self):
+      src = '''
+        #include <stdio.h>
+        #include <sys/stat.h>
+        #include <sys/types.h>
+        #include <assert.h>
+
+        int main() {
+          int err;
+          FILE* fid;
+
+          err = mkdir("/foo", 0777);
+          fid = fopen("/foo/bar", "w+");
+          fclose(fid);
+
+          err = rename("/foo/bar", "/foo/bar2");
+          printf("%d\\n", err);
+
+          err = rename("/foo", "/foo/foo");
+          printf("%d\\n", err);
+          return 0;
+        }
+      '''
+      self.do_run(src, '0\n-1\n', force_c=True)
+
     def test_alloca_stack(self):
       if self.emcc_args is None: return # too slow in other modes