-/* Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include "../locale/localeinfo.h"
#include <errno.h>
+#include <limits.h>
#include <stdio.h>
#include <time.h>
+/* This is defined in locale/C-time.c in the GNU libc. */
+extern const struct __locale_data _nl_C_LC_TIME attribute_hidden;
+#define ab_day_name(DAY) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)+(DAY)].string)
+#define ab_month_name(MON) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)+(MON)].string)
static const char format[] = "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n";
-static char result[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1];
-
-/* Returns a string of the form "Day Mon dd hh:mm:ss yyyy\n"
- which is the representation of TP in that form. */
-char *
-asctime (const struct tm *tp)
-{
- return __asctime_r (tp, result);
-}
+static char result[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1];
-char *
-__asctime_r (const struct tm *tp, char *buf)
+static char *
+asctime_internal (const struct tm *tp, char *buf, size_t buflen)
{
if (tp == NULL)
{
return NULL;
}
- if (sprintf (buf, format,
- (tp->tm_wday < 0 || tp->tm_wday >= 7 ?
- "???" : _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday)),
- (tp->tm_mon < 0 || tp->tm_mon >= 12 ?
- "???" : _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon)),
- tp->tm_mday, tp->tm_hour, tp->tm_min,
- tp->tm_sec, 1900 + tp->tm_year) < 0)
+ /* We limit the size of the year which can be printed. Using the %d
+ format specifier used the addition of 1900 would overflow the
+ number and a negative vaue is printed. For some architectures we
+ could in theory use %ld or an evern larger integer format but
+ this would mean the output needs more space. This would not be a
+ problem if the 'asctime_r' interface would be defined sanely and
+ a buffer size would be passed. */
+ if (__glibc_unlikely (tp->tm_year > INT_MAX - 1900))
+ {
+ eoverflow:
+ __set_errno (EOVERFLOW);
+ return NULL;
+ }
+
+ int n = __snprintf (buf, buflen, format,
+ (tp->tm_wday < 0 || tp->tm_wday >= 7 ?
+ "???" : ab_day_name (tp->tm_wday)),
+ (tp->tm_mon < 0 || tp->tm_mon >= 12 ?
+ "???" : ab_month_name (tp->tm_mon)),
+ tp->tm_mday, tp->tm_hour, tp->tm_min,
+ tp->tm_sec, 1900 + tp->tm_year);
+ if (n < 0)
return NULL;
+ if (n >= buflen)
+ goto eoverflow;
return buf;
}
+
+
+/* Like asctime, but write result to the user supplied buffer. The
+ buffer is only guaranteed to be 26 bytes in length. */
+char *
+__asctime_r (const struct tm *tp, char *buf)
+{
+ return asctime_internal (tp, buf, 26);
+}
weak_alias (__asctime_r, asctime_r)
+
+
+/* Returns a string of the form "Day Mon dd hh:mm:ss yyyy\n"
+ which is the representation of TP in that form. */
+char *
+asctime (const struct tm *tp)
+{
+ return asctime_internal (tp, result, sizeof (result));
+}
+libc_hidden_def (asctime)