PR 47802 Use strftime for CTIME and FDATE intrinsics

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@170478 138bc75d-0d04-0410-961f-82ee72b054a4

7 files changed, 91 insertions, 127 deletions

diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index c7e1950b1c4..fc7a2c4ca6d 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,21 @@
+2011-02-24  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR libfortran/47802
+	* config.h.in: Regenerated.
+	* configure: Regenerated.
+	* configure.ac: Remove checks for ctime and ctime_r, add check for
+	strftime.
+	* intrinsics/date_and_time.c (localtime_r): Move fallback
+	implementation to time_1.h.
+	* intrinsics/time_1.h (localtime_r): Fallback implementation.
+	* intrinsics/ctime.c: Include time_1.h.
+	(ctime_r): Remove fallback implementation.
+	(strctime): New function.
+	(fdate): Use strctime instead of ctime_r.
+	(fdate_sub): Likewise.
+	(ctime): Likewise.
+	(ctime_sub): Likewise.
+
 2011-02-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR fortran/47878
diff --git a/libgfortran/config.h.in b/libgfortran/config.h.in
index 67fb5f075a7..a255bdccf30 100644
--- a/libgfortran/config.h.in
+++ b/libgfortran/config.h.in
@@ -318,12 +318,6 @@
 /* libm includes ctanl */
 #undef HAVE_CTANL
 
-/* Define to 1 if you have the `ctime' function. */
-#undef HAVE_CTIME
-
-/* Define to 1 if you have the `ctime_r' function. */
-#undef HAVE_CTIME_R
-
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
@@ -723,6 +717,9 @@
 /* Define to 1 if you have the `strerror_r' function. */
 #undef HAVE_STRERROR_R
 
+/* Define to 1 if you have the `strftime' function. */
+#undef HAVE_STRFTIME
+
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H
 
diff --git a/libgfortran/configure b/libgfortran/configure
index 834bd8c51be..749cd000651 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -16312,7 +16312,7 @@ _ACEOF
 fi
 done
 
-for ac_func in sleep time ttyname signal alarm ctime clock access fork execl
+for ac_func in sleep time ttyname signal alarm clock access fork execl
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -16351,7 +16351,7 @@ _ACEOF
 fi
 done
 
-for ac_func in localtime_r gmtime_r strerror_r getpwuid_r ttyname_r ctime_r
+for ac_func in localtime_r gmtime_r strerror_r getpwuid_r ttyname_r
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -16364,12 +16364,14 @@ _ACEOF
 fi
 done
 
-for ac_func in clock_gettime
+for ac_func in clock_gettime strftime
 do :
-  ac_fn_c_check_func "$LINENO" "clock_gettime" "ac_cv_func_clock_gettime"
-if test "x$ac_cv_func_clock_gettime" = x""yes; then :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+   if test "x$as_val" = x""yes; then :
   cat >>confdefs.h <<_ACEOF
-#define HAVE_CLOCK_GETTIME 1
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
 _ACEOF
 
 fi
diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac
index d25a067e127..66468dbc035 100644
--- a/libgfortran/configure.ac
+++ b/libgfortran/configure.ac
@@ -248,11 +248,11 @@ AC_CHECK_MEMBERS([struct stat.st_rdev])
 # Check for library functions.
 AC_CHECK_FUNCS(getrusage times mkstemp strtof strtold snprintf ftruncate chsize)
 AC_CHECK_FUNCS(chdir strerror getlogin gethostname kill link symlink perror)
-AC_CHECK_FUNCS(sleep time ttyname signal alarm ctime clock access fork execl)
+AC_CHECK_FUNCS(sleep time ttyname signal alarm clock access fork execl)
 AC_CHECK_FUNCS(wait setmode execvp pipe dup2 close fdopen strcasestr getrlimit)
 AC_CHECK_FUNCS(gettimeofday stat fstat lstat getpwuid vsnprintf dup getcwd)
-AC_CHECK_FUNCS(localtime_r gmtime_r strerror_r getpwuid_r ttyname_r ctime_r)
-AC_CHECK_FUNCS(clock_gettime)
+AC_CHECK_FUNCS(localtime_r gmtime_r strerror_r getpwuid_r ttyname_r)
+AC_CHECK_FUNCS(clock_gettime strftime)
 
 # Check for glibc backtrace functions
 AC_CHECK_FUNCS(backtrace backtrace_symbols)
diff --git a/libgfortran/intrinsics/ctime.c b/libgfortran/intrinsics/ctime.c
index b7b463c3aca..7eb10f5fa2c 100644
--- a/libgfortran/intrinsics/ctime.c
+++ b/libgfortran/intrinsics/ctime.c
@@ -25,42 +25,31 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #include "libgfortran.h"
 
-#ifdef TIME_WITH_SYS_TIME
-#  include <sys/time.h>
-#  include <time.h>
-#else
-#  if HAVE_SYS_TIME_H
-#    include <sys/time.h>
-#  else
-#    ifdef HAVE_TIME_H
-#      include <time.h>
-#    endif
-#  endif
-#endif
+#include "time_1.h"
 
 #include <string.h>
 
 
-#ifndef HAVE_CTIME_R
-/* Make sure we don't see here a macro.  */
-#undef ctime_r
+/* 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 char *
-ctime_r (const time_t * timep, char * buf __attribute__((unused)))
+static size_t
+strctime (char *s, size_t max, const time_t *timep)
 {
-#ifdef HAVE_CTIME
-  char *tmp = ctime (timep);
-  if (tmp)
-    tmp = strcpy (buf, tmp);
-  return tmp;
+#ifdef HAVE_STRFTIME
+  struct tm res;
+  struct tm *ltm = localtime_r (timep, &res);
+  return strftime (s, max, "%c", ltm);
 #else
-  return NULL;
+  return 0;
 #endif
 }
-#endif
 
-/* ctime_r() buffer size needs to be at least 26 bytes.  */
-#define CSZ 26
+/* 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);
@@ -68,29 +57,15 @@ export_proto(fdate);
 void
 fdate (char ** date, gfc_charlen_type * date_len)
 {
-#if defined(HAVE_TIME) && defined(HAVE_CTIME)
-  char cbuf[CSZ];
-  int i;
+#if defined(HAVE_TIME)
   time_t now = time(NULL);
-  *date = ctime_r (&now, cbuf);
-  if (*date != NULL)
-    {
-      *date = strdup (*date);
-      *date_len = strlen (*date);
-
-      i = 0;
-      while ((*date)[i])
-       {
-         if ((*date)[i] == '\n')
-           (*date)[i] = ' ';
-         i++;
-       }
-      return;
-    }
-#endif
+  *date = get_mem (CSZ);
+  *date_len = strctime (*date, CSZ, &now);
+#else
 
   *date = NULL;
   *date_len = 0;
+#endif
 }
 
 
@@ -100,22 +75,14 @@ export_proto(fdate_sub);
 void
 fdate_sub (char * date, gfc_charlen_type date_len)
 {
-#if defined(HAVE_TIME) && defined(HAVE_CTIME)
-  char cbuf[CSZ];
-  int i;
-  char *d;
+#if defined(HAVE_TIME)
   time_t now = time(NULL);
-#endif
-  
+  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);
-#if defined(HAVE_TIME) && defined(HAVE_CTIME)
-  d = ctime_r (&now, cbuf);
-  if (d != NULL)
-    {
-      i = 0;
-      while (*d && *d != '\n' && i < date_len)
-       date[i++] = *(d++);
-    }
 #endif
 }
 
@@ -127,29 +94,15 @@ export_proto_np(PREFIX(ctime));
 void
 PREFIX(ctime) (char ** date, gfc_charlen_type * date_len, GFC_INTEGER_8 t)
 {
-#if defined(HAVE_CTIME)
-  char cbuf[CSZ];
+#if defined(HAVE_TIME)
   time_t now = t;
-  int i;
-  *date = ctime_r (&now, cbuf);
-  if (*date != NULL)
-    {
-      *date = strdup (*date);
-      *date_len = strlen (*date);
-
-      i = 0;
-      while ((*date)[i])
-       {
-         if ((*date)[i] == '\n')
-           (*date)[i] = ' ';
-         i++;
-       }
-      return;
-    }
-#endif
+  *date = get_mem (CSZ);
+  *date_len = strctime (*date, CSZ, &now);
+#else
 
   *date = NULL;
   *date_len = 0;
+#endif
 }
 
 
@@ -159,21 +112,9 @@ export_proto(ctime_sub);
 void
 ctime_sub (GFC_INTEGER_8 * t, char * date, gfc_charlen_type date_len)
 {
-#if defined(HAVE_CTIME)
-  char cbuf[CSZ];
-  int i;
-  char *d;
   time_t now = *t;
-#endif
-  
-  memset (date, ' ', date_len);
-#if defined(HAVE_CTIME)
-  d = ctime_r (&now, cbuf);
-  if (d != NULL)
-    {
-      i = 0;
-      while (*d && *d != '\n' && i < date_len)
-       date[i++] = *(d++);
-    }
-#endif
+  char *s = get_mem (date_len + 1);
+  size_t n = strctime (s, date_len + 1, &now);
+  fstrcpy (date, date_len, s, n);
+  free (s);
 }
diff --git a/libgfortran/intrinsics/date_and_time.c b/libgfortran/intrinsics/date_and_time.c
index c58d11437b3..793df687fb9 100644
--- a/libgfortran/intrinsics/date_and_time.c
+++ b/libgfortran/intrinsics/date_and_time.c
@@ -36,24 +36,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif
 
 
-/* If the re-entrant versions of localtime and gmtime are not
-   available, provide fallback implementations.  On some targets where
-   the _r versions are not available, localtime and gmtime use
-   thread-local storage so they are threadsafe.  */
-
-#ifndef HAVE_LOCALTIME_R
-/* If _POSIX is defined localtime_r gets defined by mingw-w64 headers.  */
-#ifdef localtime_r
-#undef localtime_r
-#endif
-
-static struct tm *
-localtime_r (const time_t * timep, struct tm * result)
-{
-  *result = *localtime (timep);
-  return result;
-}
-#endif
+/* If the re-entrant version of gmtime is not available, provide a
+   fallback implementation.  On some targets where the _r version is
+   not available, gmtime uses thread-local storage so it's
+   threadsafe.  */
 
 #ifndef HAVE_GMTIME_R
 /* If _POSIX is defined gmtime_r gets defined by mingw-w64 headers.  */
diff --git a/libgfortran/intrinsics/time_1.h b/libgfortran/intrinsics/time_1.h
index 073595a1442..12d79ebc12f 100644
--- a/libgfortran/intrinsics/time_1.h
+++ b/libgfortran/intrinsics/time_1.h
@@ -84,6 +84,26 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif  /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H  */
 
 
+/* If the re-entrant version of localtime is not available, provide a
+   fallback implementation.  On some targets where the _r version is
+   not available, localtime uses thread-local storage so it's
+   threadsafe.  */
+
+#ifndef HAVE_LOCALTIME_R
+/* If _POSIX is defined localtime_r gets defined by mingw-w64 headers.  */
+#ifdef localtime_r
+#undef localtime_r
+#endif
+
+static inline struct tm *
+localtime_r (const time_t * timep, struct tm * result)
+{
+  *result = *localtime (timep);
+  return result;
+}
+#endif
+
+
 #if defined (__GNUC__) && (__GNUC__ >= 3)
 #  define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
 #else