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90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "../locale/localeinfo.h"
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <time.h>
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/* This is defined in locale/C-time.c in the GNU libc. */
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extern const struct __locale_data _nl_C_LC_TIME attribute_hidden;
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#define ab_day_name(DAY) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)+(DAY)].string)
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#define ab_month_name(MON) (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)+(MON)].string)
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static const char format[] = "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n";
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static char result[ 3+1+ 3+1+20+1+20+1+20+1+20+1+20+1 + 1];
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static char *
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asctime_internal (const struct tm *tp, char *buf, size_t buflen)
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{
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if (tp == NULL)
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{
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__set_errno (EINVAL);
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return NULL;
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}
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/* We limit the size of the year which can be printed. Using the %d
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format specifier used the addition of 1900 would overflow the
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number and a negative vaue is printed. For some architectures we
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could in theory use %ld or an evern larger integer format but
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this would mean the output needs more space. This would not be a
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problem if the 'asctime_r' interface would be defined sanely and
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a buffer size would be passed. */
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if (__glibc_unlikely (tp->tm_year > INT_MAX - 1900))
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{
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eoverflow:
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__set_errno (EOVERFLOW);
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return NULL;
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}
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int n = __snprintf (buf, buflen, format,
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(tp->tm_wday < 0 || tp->tm_wday >= 7 ?
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"???" : ab_day_name (tp->tm_wday)),
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(tp->tm_mon < 0 || tp->tm_mon >= 12 ?
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"???" : ab_month_name (tp->tm_mon)),
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tp->tm_mday, tp->tm_hour, tp->tm_min,
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tp->tm_sec, 1900 + tp->tm_year);
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if (n < 0)
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return NULL;
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if (n >= buflen)
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goto eoverflow;
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return buf;
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}
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/* Like asctime, but write result to the user supplied buffer. The
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buffer is only guaranteed to be 26 bytes in length. */
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char *
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__asctime_r (const struct tm *tp, char *buf)
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{
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return asctime_internal (tp, buf, 26);
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}
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weak_alias (__asctime_r, asctime_r)
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/* Returns a string of the form "Day Mon dd hh:mm:ss yyyy\n"
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which is the representation of TP in that form. */
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char *
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asctime (const struct tm *tp)
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{
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return asctime_internal (tp, result, sizeof (result));
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}
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libc_hidden_def (asctime)
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