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authorUlrich Drepper <drepper@gmail.com>2011-05-21 12:11:36 -0400
committerUlrich Drepper <drepper@gmail.com>2011-05-21 12:11:36 -0400
commit7ea72f99966a65a56aedba817ee2413ff9b1f23c (patch)
treeb5e30f57554d3999654fff7fc2223dffc4d167fb /string
parent7e4afad5bcf49e03c3b987399c6a8f66a9018660 (diff)
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Always fill output buffer in XPG strerror function
Diffstat (limited to 'string')
-rw-r--r--string/xpg-strerror.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/string/xpg-strerror.c b/string/xpg-strerror.c
index 8d89812..00256c3 100644
--- a/string/xpg-strerror.c
+++ b/string/xpg-strerror.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1993, 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2010
+/* Copyright (C) 1991, 1993, 1995-1998, 2000, 2002, 2004, 2010, 2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -17,6 +17,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+#include <assert.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
@@ -37,16 +38,16 @@
int
__xpg_strerror_r (int errnum, char *buf, size_t buflen)
{
+ const char *estr = __strerror_r (errnum, buf, buflen);
+ size_t estrlen = strlen (estr);
+
if (errnum < 0 || errnum >= _sys_nerr_internal
|| _sys_errlist_internal[errnum] == NULL)
return EINVAL;
- const char *estr = (const char *) _(_sys_errlist_internal[errnum]);
- size_t estrlen = strlen (estr) + 1;
-
- if (buflen < estrlen)
- return ERANGE;
+ assert (estr != buf);
+/* Terminate the string in any case. */
+ *((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0';
- memcpy (buf, estr, estrlen);
- return 0;
+ return buflen <= estrlen ? ERANGE : 0;
}