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PR 61310 Rewrite implementation of CTIME and FDATE intrinsics.

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2014-05-26  Janne Blomqvist  <jb@gcc.gnu.org>

	PR libfortran/61310
	* intrinsics.texi (CTIME): Remove mention of locale-dependent
	behavior.

2014-05-26  Janne Blomqvist  <jb@gcc.gnu.org>

	PR libfortran/61310
	* intrinsics/ctime.c (strctime): Rename to gf_ctime, use snprintf
	instead of strftime.
	(fdate): Use gf_ctime.
	(fdate_sub): Likewise.
	(ctime): Likewise.
	(ctime_sub): Likewise.

From-SVN: r210938
This commit is contained in:
Janne Blomqvist 2014-05-26 21:17:13 +03:00
parent b8140cd629
commit ab75303f7d
4 changed files with 61 additions and 31 deletions
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6
gcc/fortran/ChangeLog
View File

@ -1,3 +1,9 @@
2014-05-26 Janne Blomqvist <jb@gcc.gnu.org>
PR libfortran/61310
* intrinsics.texi (CTIME): Remove mention of locale-dependent
behavior.
2014-05-26 Tobias Burnus <burnus@net-b.de>
PR fortran/55117

6
gcc/fortran/intrinsic.texi
View File

@ -3508,10 +3508,8 @@ end program test_cshift
@table @asis
@item @emph{Description}:
@code{CTIME} converts a system time value, such as returned by
@code{TIME8}, to a string. Unless the application has called
@code{setlocale}, the output will be in the default locale, of length
24 and of the form @samp{Sat Aug 19 18:13:14 1995}. In other locales,
a longer string may result.
@code{TIME8}, to a string. The output will be of the form @samp{Sat
Aug 19 18:13:14 1995}.
This intrinsic is provided in both subroutine and function forms; however,
only one form can be used in any given program unit.

10
libgfortran/ChangeLog
View File

@ -1,3 +1,13 @@
2014-05-26 Janne Blomqvist <jb@gcc.gnu.org>
PR libfortran/61310
* intrinsics/ctime.c (strctime): Rename to gf_ctime, use snprintf
instead of strftime.
(fdate): Use gf_ctime.
(fdate_sub): Likewise.
(ctime): Likewise.
(ctime_sub): Likewise.
2014-05-26 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libgfortran/55117

66
libgfortran/intrinsics/ctime.c
View File

@ -31,31 +31,53 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#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. */
/* Maximum space a ctime-like string might need. A "normal" ctime
string is 26 bytes, and in our case 24 bytes as we don't include
the trailing newline and null. However, the longest possible year
number is -2,147,481,748 (1900 - 2,147,483,648, since tm_year is a
32-bit signed integer) so an extra 7 bytes are needed. */
#define CTIME_BUFSZ 31
static size_t
strctime (char *s, size_t max, const time_t *timep)
/* Thread-safe ctime-like function that fills a Fortran
string. ctime_r is a portability headache and marked as obsolescent
in POSIX 2008, which recommends strftime in its place. However,
strftime(..., "%c",...) doesn't produce ctime-like output on
MinGW, so do it manually with snprintf. */
static int
gf_ctime (char *s, size_t max, const time_t timev)
{
struct tm ltm;
int failed;
char buf[CTIME_BUFSZ + 1];
/* 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, &ltm))
__builtin_choose_expr (__builtin_classify_type (localtime_r (&timev, &ltm))
== 5,
failed = localtime_r (timep, &ltm) == NULL,
failed = localtime_r (timep, &ltm) != 0);
failed = localtime_r (&timev, &ltm) == NULL,
failed = localtime_r (&timev, &ltm) != 0);
if (failed)
goto blank;
int n = snprintf (buf, sizeof (buf),
"%3.3s %3.3s%3d %.2d:%.2d:%.2d %d",
"SunMonTueWedThuFriSat" + ltm.tm_wday * 3,
"JanFebMarAprMayJunJulAugSepOctNovDec" + ltm.tm_mon * 3,
ltm.tm_mday, ltm.tm_hour, ltm.tm_min, ltm.tm_sec,
1900 + ltm.tm_year);
if (n < 0)
goto blank;
if ((size_t) n <= max)
{
cf_strcpy (s, max, buf);
return n;
}
blank:
memset (s, ' ', max);
return 0;
return strftime (s, max, "%c", &ltm);
}
/* 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);
@ -64,8 +86,8 @@ void
fdate (char ** date, gfc_charlen_type * date_len)
{
time_t now = time(NULL);
*date = xmalloc (CSZ);
*date_len = strctime (*date, CSZ, &now);
*date = xmalloc (CTIME_BUFSZ);
*date_len = gf_ctime (*date, CTIME_BUFSZ, now);
}
@ -76,10 +98,7 @@ void
fdate_sub (char * date, gfc_charlen_type date_len)
{
time_t now = time(NULL);
char *s = xmalloc (date_len + 1);
size_t n = strctime (s, date_len + 1, &now);
fstrcpy (date, date_len, s, n);
free (s);
gf_ctime (date, date_len, now);
}
@ -91,8 +110,8 @@ void
PREFIX(ctime) (char ** date, gfc_charlen_type * date_len, GFC_INTEGER_8 t)
{
time_t now = t;
*date = xmalloc (CSZ);
*date_len = strctime (*date, CSZ, &now);
*date = xmalloc (CTIME_BUFSZ);
*date_len = gf_ctime (*date, CTIME_BUFSZ, now);
}
@ -103,8 +122,5 @@ void
ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
{
time_t now = *t;
char *s = xmalloc (date_len + 1);
size_t n = strctime (s, date_len + 1, &now);
fstrcpy (date, date_len, s, n);
free (s);
gf_ctime (date, date_len, now);
}