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/* Implementation of the CTIME and FDATE g77 intrinsics.
Copyright (C) 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
Libgfortran 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include "time_1.h"
#include <string.h>
/* strftime-like function that fills a C string with %c format which
is identical to ctime in the default locale. As ctime and ctime_r
are poorly specified and their usage not recommended, the
implementation instead uses strftime. */
static size_t
strctime (char *s, size_t max, const time_t *timep)
{
#ifdef HAVE_STRFTIME
struct tm ltm;
int failed;
/* Some targets provide a localtime_r based on a draft of the POSIX
standard where the return type is int rather than the
standardized struct tm*. */
__builtin_choose_expr (__builtin_classify_type (localtime_r (timep, <m))
== 5,
failed = localtime_r (timep, <m) == NULL,
failed = localtime_r (timep, <m) != 0);
if (failed)
return 0;
return strftime (s, max, "%c", <m);
#else
return 0;
#endif
}
/* In the default locale, the date and time representation fits in 26
bytes. However, other locales might need more space. */
#define CSZ 100
extern void fdate (char **, gfc_charlen_type *);
export_proto(fdate);
void
fdate (char ** date, gfc_charlen_type * date_len)
{
#if defined(HAVE_TIME)
time_t now = time(NULL);
*date = get_mem (CSZ);
*date_len = strctime (*date, CSZ, &now);
#else
*date = NULL;
*date_len = 0;
#endif
}
extern void fdate_sub (char *, gfc_charlen_type);
export_proto(fdate_sub);
void
fdate_sub (char * date, gfc_charlen_type date_len)
{
#if defined(HAVE_TIME)
time_t now = time(NULL);
char *s = get_mem (date_len + 1);
size_t n = strctime (s, date_len + 1, &now);
fstrcpy (date, date_len, s, n);
free (s);
#else
memset (date, ' ', date_len);
#endif
}
extern void PREFIX(ctime) (char **, gfc_charlen_type *, GFC_INTEGER_8);
export_proto_np(PREFIX(ctime));
void
PREFIX(ctime) (char ** date, gfc_charlen_type * date_len, GFC_INTEGER_8 t)
{
#if defined(HAVE_TIME)
time_t now = t;
*date = get_mem (CSZ);
*date_len = strctime (*date, CSZ, &now);
#else
*date = NULL;
*date_len = 0;
#endif
}
extern void ctime_sub (GFC_INTEGER_8 *, char *, gfc_charlen_type);
export_proto(ctime_sub);
void
ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
{
time_t now = *t;
char *s = get_mem (date_len + 1);
size_t n = strctime (s, date_len + 1, &now);
fstrcpy (date, date_len, s, n);
free (s);
}
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