realpath: Bring back GNU extension on ENOENT and EACCES [BZ #28996]

The GNU extension for realpath states that if the path resolution fails
with ENOENT or EACCES and the resolved buffer is non-NULL, it will
contain part of the path that failed resolution.

commit 949ad78a189194048df8a253bb31d1d11d919044 broke this when it
omitted the copy on failure.  Bring it back partially to continue
supporting this GNU extension.

Resolves: BZ #28996

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>

diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c
index 6237a41..e6566bd 100644 (file)
--- a/stdlib/canonicalize.c
+++ b/stdlib/canonicalize.c
@@ -400,11 +400,14 @@ realpath_stk (const char *name, char *resolved,
 
 error:
   *dest++ = '\0';
-  if (!failed && resolved != NULL)
+  if (resolved != NULL)
     {
-      if (dest - rname <= get_path_max ())
+      /* Copy the full result on success or partial result if failure was due
+        to the path not existing or not being accessible.  */
+      if ((!failed || errno == ENOENT || errno == EACCES)
+         && dest - rname <= get_path_max ())
        rname = strcpy (resolved, rname);
-      else
+      else if (!failed)
        {
          failed = true;
          __set_errno (ENAMETOOLONG);

diff --git a/stdlib/test-canon.c b/stdlib/test-canon.c
index 2ad1218..a9c83be 100644 (file)
--- a/stdlib/test-canon.c
+++ b/stdlib/test-canon.c
@@ -174,8 +174,8 @@ do_test (int argc, char ** argv)
          continue;
        }
 
-      /* Only on success verify that buf contains the result too.  */
-      if (result != NULL
+      /* Verify buf contents if the call succeeded or failed with ENOENT.  */
+      if ((result != NULL || errno == ENOENT)
          && !check_path (buf, tests[i].out ? tests[i].out : tests[i].resolved))
        {
          printf ("%s: flunked test %d (expected resolved `%s', got `%s')\n",