1 files changed, 68 insertions, 0 deletions
diff --git a/util/timegm.c b/util/timegm.c
new file mode 100644
index 0000000..3b7931e
--- /dev/null
+++ b/util/timegm.c
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+/* timegm.c - libc replacement function
+ * Copyright (C) 2004 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+/*
+  timegm() is a GNU function that might not be available everywhere.
+  It's basically the inverse of gmtime() - you give it a struct tm,
+  and get back a time_t.  It differs from mktime() in that it handles
+  the case where the struct tm is UTC and the local environment isn't.
+
+  Some BSDs don't handle the putenv("foo") case properly, so we use
+  unsetenv if the platform has it to remove environment variables.
+*/
+
+#include <config.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+
+time_t
+timegm(struct tm *tm)
+{
+  time_t answer;
+  char *zone;
+
+  zone=getenv("TZ");
+  putenv("TZ=UTC");
+  tzset();
+  answer=mktime(tm);
+  if(zone)
+    {
+      char *old_zone;
+
+      old_zone=malloc(3+strlen(zone)+1);
+      if(old_zone)
+	{
+	  strcpy(old_zone,"TZ=");
+	  strcat(old_zone,zone);
+	  putenv(old_zone);	
+	}
+    }
+  else
+#ifdef HAVE_UNSETENV
+    unsetenv("TZ");
+#else
+    putenv("TZ");
+#endif
+
+  tzset();
+  return answer;
+}