Virgin import of diffutils 2.8.7.

1 files changed, 121 insertions, 0 deletions

diff --git a/contrib/diff/lib/gettimeofday.c b/contrib/diff/lib/gettimeofday.c
new file mode 100644
index 0000000..1ebe4d0
--- /dev/null
+++ b/contrib/diff/lib/gettimeofday.c
@@ -0,0 +1,121 @@
+/* Work around the bug in some systems whereby gettimeofday clobbers the
+   static buffer that localtime uses for it's return value.  The gettimeofday
+   function from Mac OS X 10.0.4, i.e. Darwin 1.3.7 has this problem.
+   The tzset replacement is necessary for at least Solaris 2.5, 2.5.1, and 2.6.
+   Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
+
+   This program 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 2, or (at your option)
+   any later version.
+
+   This program 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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+/* Disable the definitions of these functions (from config.h)
+   so we can use the library versions here.  */
+#undef gettimeofday
+#undef gmtime
+#undef localtime
+#undef tzset
+
+#include <sys/types.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
+#include <stdlib.h>
+
+static struct tm *localtime_buffer_addr;
+
+/* This is a wrapper for localtime.  It is used only on systems for which
+   gettimeofday clobbers the static buffer used for localtime's result.
+
+   On the first call, record the address of the static buffer that
+   localtime uses for its result.  */
+
+struct tm *
+rpl_localtime (const time_t *timep)
+{
+  struct tm *tm = localtime (timep);
+
+  if (! localtime_buffer_addr)
+    localtime_buffer_addr = tm;
+
+  return tm;
+}
+
+/* Same as above, since gmtime and localtime use the same buffer.  */
+struct tm *
+rpl_gmtime (const time_t *timep)
+{
+  struct tm *tm = gmtime (timep);
+
+  if (! localtime_buffer_addr)
+    localtime_buffer_addr = tm;
+
+  return tm;
+}
+
+/* This is a wrapper for gettimeofday.  It is used only on systems for which
+   gettimeofday clobbers the static buffer used for localtime's result.
+
+   Save and restore the contents of the buffer used for localtime's result
+   around the call to gettimeofday.  */
+
+int
+rpl_gettimeofday (struct timeval *tv, struct timezone *tz)
+{
+  struct tm save;
+  int result;
+
+  if (! localtime_buffer_addr)
+    {
+      time_t t = 0;
+      localtime_buffer_addr = localtime (&t);
+    }
+
+  save = *localtime_buffer_addr;
+  result = gettimeofday (tv, tz);
+  *localtime_buffer_addr = save;
+
+  return result;
+}
+
+/* This is a wrapper for tzset. It is used only on systems for which
+   tzset may clobber the static buffer used for localtime's result.
+   Save and restore the contents of the buffer used for localtime's
+   result around the call to tzset.  */
+void
+rpl_tzset (void)
+{
+  struct tm save;
+
+  if (! localtime_buffer_addr)
+    {
+      time_t t = 0;
+      localtime_buffer_addr = localtime (&t);
+    }
+
+  save = *localtime_buffer_addr;
+  tzset ();
+  *localtime_buffer_addr = save;
+}