new file

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1571 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/asn1/timegm.c

@@ -0,0 +1,33 @@
+#include "asn1_locl.h"
+
+RCSID("$Id$");
+
+static int
+is_leap(unsigned y)
+{
+  return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
+}
+
+time_t
+timegm (struct tm *tm)
+{
+  static const int ndays[2][12] ={
+    {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+    {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
+  time_t res = 0;
+  int i;
+
+  for (i = 70; i < tm->tm_year; ++i)
+    res += is_leap(i) ? 366 : 365;
+
+  for (i = 0; i < tm->tm_mon; ++i)
+    res += ndays[is_leap(tm->tm_year)][i];
+  res += tm->tm_mday - 1;
+  res *= 24;
+  res += tm->tm_hour;
+  res *= 60;
+  res += tm->tm_min;
+  res *= 60;
+  res += tm->tm_sec;
+  return res;
+}