glibc/time/asctime.c

62 lines
2.0 KiB
C

/* Copyright (C) 1991, 1993, 1995, 1996, 1997 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 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.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "../locale/localeinfo.h"
#include <errno.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;
#define ab_day_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
#define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].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);
}
char *
__asctime_r (const struct tm *tp, char *buf)
{
if (tp == NULL)
{
__set_errno (EINVAL);
return NULL;
}
if (sprintf (buf, 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) < 0)
return NULL;
return buf;
}
weak_alias (__asctime_r, asctime_r)