126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/* Implementation of the CTIME and FDATE g77 intrinsics.
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Copyright (C) 2005-2019 Free Software Foundation, Inc.
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Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran 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
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include "time_1.h"
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#include <string.h>
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/* Maximum space a ctime-like string might need. A "normal" ctime
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string is 26 bytes, and in our case 24 bytes as we don't include
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the trailing newline and null. However, the longest possible year
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number is -2,147,481,748 (1900 - 2,147,483,648, since tm_year is a
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32-bit signed integer) so an extra 7 bytes are needed. */
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#define CTIME_BUFSZ 31
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/* Thread-safe ctime-like function that fills a Fortran
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string. ctime_r is a portability headache and marked as obsolescent
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in POSIX 2008, which recommends strftime in its place. However,
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strftime(..., "%c",...) doesn't produce ctime-like output on
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MinGW, so do it manually with snprintf. */
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static int
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gf_ctime (char *s, size_t max, const time_t timev)
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{
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struct tm ltm;
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int failed;
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char buf[CTIME_BUFSZ + 1];
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/* Some targets provide a localtime_r based on a draft of the POSIX
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standard where the return type is int rather than the
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standardized struct tm*. */
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__builtin_choose_expr (__builtin_classify_type (localtime_r (&timev, <m))
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== 5,
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failed = localtime_r (&timev, <m) == NULL,
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failed = localtime_r (&timev, <m) != 0);
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if (failed)
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goto blank;
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int n = snprintf (buf, sizeof (buf),
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"%3.3s %3.3s%3d %.2d:%.2d:%.2d %d",
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"SunMonTueWedThuFriSat" + ltm.tm_wday * 3,
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"JanFebMarAprMayJunJulAugSepOctNovDec" + ltm.tm_mon * 3,
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ltm.tm_mday, ltm.tm_hour, ltm.tm_min, ltm.tm_sec,
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1900 + ltm.tm_year);
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if (n < 0)
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goto blank;
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if ((size_t) n <= max)
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{
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cf_strcpy (s, max, buf);
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return n;
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}
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blank:
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memset (s, ' ', max);
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return 0;
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}
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extern void fdate (char **, gfc_charlen_type *);
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export_proto(fdate);
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void
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fdate (char ** date, gfc_charlen_type * date_len)
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{
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time_t now = time(NULL);
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*date = xmalloc (CTIME_BUFSZ);
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*date_len = gf_ctime (*date, CTIME_BUFSZ, now);
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}
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extern void fdate_sub (char *, gfc_charlen_type);
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export_proto(fdate_sub);
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void
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fdate_sub (char * date, gfc_charlen_type date_len)
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{
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time_t now = time(NULL);
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gf_ctime (date, date_len, now);
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}
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extern void PREFIX(ctime) (char **, gfc_charlen_type *, GFC_INTEGER_8);
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export_proto_np(PREFIX(ctime));
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void
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PREFIX(ctime) (char ** date, gfc_charlen_type * date_len, GFC_INTEGER_8 t)
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{
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time_t now = t;
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*date = xmalloc (CTIME_BUFSZ);
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*date_len = gf_ctime (*date, CTIME_BUFSZ, now);
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}
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extern void ctime_sub (GFC_INTEGER_8 *, char *, gfc_charlen_type);
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export_proto(ctime_sub);
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void
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ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
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{
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time_t now = *t;
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gf_ctime (date, date_len, now);
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}
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