1 files changed, 50 insertions, 18 deletions
diff --git a/mdk-stage1/dietlibc/libugly/mktime.c b/mdk-stage1/dietlibc/libugly/mktime.c
index ee4dab6c1..348068e1d 100644
--- a/mdk-stage1/dietlibc/libugly/mktime.c
+++ b/mdk-stage1/dietlibc/libugly/mktime.c
@@ -1,21 +1,53 @@
 #include <time.h>
 
-/* seconds per day */
-#define SPD 24*60*60
-
-extern unsigned int __spm[];
-
-time_t mktime(struct tm *t) {
-  time_t x=0;
-  unsigned int i;
-  if (t->tm_year<70) return (time_t)(-1);
-  for (i=70; i<t->tm_year; ++i) {
-    x+=__isleap(i+1900)?366:365;
-  }
-  t->tm_yday=__spm[t->tm_mon] + t->tm_mday-1 + ((t->tm_mon>2) && __isleap(t->tm_year)?1:0);
-  x+=t->tm_yday;
-  /* x is now the number of days since Jan 1 1970 */
-  t->tm_wday=(4+x)%7;
-  x = x*SPD + t->tm_hour*60*60 + t->tm_min*60 + t->tm_sec;
-  return x;
+extern const short  __spm [];
+
+time_t  mktime ( register struct tm* const t )
+{
+    register time_t  day;
+    register time_t  i;
+
+    if ( t->tm_year < 70 )
+        return (time_t) -1;
+
+    day = t->tm_yday = __spm [t->tm_mon] + t->tm_mday-1 + ( __isleap (t->tm_year+1900)  &  (t->tm_mon > 1) );
+
+    for ( i = 70; i < t->tm_year; i++ )
+        day += 365 + __isleap (i+1900);
+
+    /* day is now the number of days since 'Jan 1 1970' */
+    i = 7;
+    t->tm_wday = (day + 4) % i;                        /* Sunday=0, Monday=1, ..., Saturday=6 */
+
+    i = 24;
+    day *= i;
+    i = 60;
+    return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
+}
+
+#if 0
+
+#include <math.h>
+
+main()
+{
+    int i, j, k;
+    static char *s[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+
+    for (i=70; i<200; i++)
+        for (j=0; j<12; j++)
+            for (k=1; k<=31; k++) {
+                struct tm t;
+                double x;
+                t.tm_year = i;
+                t.tm_mon  = j;
+                t.tm_mday = k;
+                t.tm_hour = 0;
+                t.tm_min  = 0;
+                t.tm_sec  = 0;
+                x = mktime (&t);
+                printf ("%4d.%5.0f  %2u.%02u.%04u  %s\n", (int)floor(x/86400), x-86400.*(int)floor(x/86400), k, j+1, 1900+i, s[t.tm_wday] );
+            }
+
 }
+#endif