document mingw linker fix and close associated bug

[debian/gzip] / lib / perror.c

diff --git a/lib/perror.c b/lib/perror.c
index bc3c764911dfec960ea29b9bee85db4b0f43ada3..827a37cc8d42b3b617d6b01915af7a255b659f6e 100644 (file)
--- a/lib/perror.c
+++ b/lib/perror.c
@@ -1,5 +1,5 @@
 /* Print a message describing error code.
-   Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2008-2018 Free Software Foundation, Inc.
    Written by Bruno Haible and Simon Josefsson.
 
    This program is free software: you can redistribute it and/or modify
@@ -13,7 +13,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
@@ -21,15 +21,29 @@
 #include <stdio.h>
 
 #include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 
+#include "strerror-override.h"
+
+/* Use the system functions, not the gnulib overrides in this file.  */
+#undef fprintf
+
 void
 perror (const char *string)
 {
-  const char *errno_description = strerror (errno);
+  char stackbuf[STACKBUF_LEN];
+  int ret;
+
+  /* Our implementation guarantees that this will be a non-empty
+     string, even if it returns EINVAL; and stackbuf should be sized
+     large enough to avoid ERANGE.  */
+  ret = strerror_r (errno, stackbuf, sizeof stackbuf);
+  if (ret == ERANGE)
+    abort ();
 
   if (string != NULL && *string != '\0')
-    fprintf (stderr, "%s: %s\n", string, errno_description);
+    fprintf (stderr, "%s: %s\n", string, stackbuf);
   else
-    fprintf (stderr, "%s\n", errno_description);
+    fprintf (stderr, "%s\n", stackbuf);
 }