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authorUlrich Drepper <drepper@gmail.com>2011-05-21 12:09:23 -0400
committerUlrich Drepper <drepper@gmail.com>2011-05-21 12:09:23 -0400
commit7e4afad5bcf49e03c3b987399c6a8f66a9018660 (patch)
tree4773f1a9b6cdb4e3562c8bc968da552789f836b9 /string/_strerror.c
parent8e211fecca7bddfb03a3aed54a47c243afddc150 (diff)
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Nicer output for negative error numbers in strerror_r
Diffstat (limited to 'string/_strerror.c')
-rw-r--r--string/_strerror.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/string/_strerror.c b/string/_strerror.c
index cb5d9e3609..ad9b148108 100644
--- a/string/_strerror.c
+++ b/string/_strerror.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,93,95,96,97,98,2000,2002,2006
+/* Copyright (C) 1991,93,95,96,97,98,2000,2002,2006,2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -18,7 +18,9 @@
02111-1307 USA. */
#include <libintl.h>
+#include <stdbool.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <stdio-common/_itoa.h>
@@ -43,15 +45,21 @@ __strerror_r (int errnum, char *buf, size_t buflen)
`int' of 8 bytes we never need more than 20 digits. */
char numbuf[21];
const char *unk = _("Unknown error ");
- const size_t unklen = strlen (unk);
+ size_t unklen = strlen (unk);
char *p, *q;
+ bool negative = errnum < 0;
numbuf[20] = '\0';
- p = _itoa_word (errnum, &numbuf[20], 10, 0);
+ p = _itoa_word (abs (errnum), &numbuf[20], 10, 0);
/* Now construct the result while taking care for the destination
buffer size. */
q = __mempcpy (buf, unk, MIN (unklen, buflen));
+ if (negative && unklen < buflen)
+ {
+ *q++ = '-';
+ ++unklen;
+ }
if (unklen < buflen)
memcpy (q, p, MIN ((size_t) (&numbuf[21] - p), buflen - unklen));