1 files changed, 74 insertions, 0 deletions
diff --git a/libc/time/tm_conv.c b/libc/time/tm_conv.c
index 96f4735..ffd524c 100644
--- a/libc/time/tm_conv.c
+++ b/libc/time/tm_conv.c
@@ -1,4 +1,5 @@
 
+#if 0
 #include <time.h>
 
 /* This is a translation from ALGOL in Collected Algorithms of CACM. */
@@ -62,3 +63,76 @@ static int   moffset[] =
    if (m > 1 && ((y) % 4 == 0 && ((y) % 100 != 0 || (y) % 400 == 0)))
       tmbuf->tm_yday++;
 }
+
+#else
+
+/* This is adapted from glibc */
+/* Copyright (C) 1991, 1993 Free Software Foundation, Inc */
+
+#define SECS_PER_HOUR 3600L
+#define SECS_PER_DAY  86400L
+
+#include <time.h>
+
+static const unsigned short int __mon_lengths[2][12] =
+  {
+    /* Normal years.  */
+    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+    /* Leap years.  */
+    { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+  };
+
+
+void
+__tm_conv(tmbuf, t, offset)
+struct tm *tmbuf;
+time_t *t;
+time_t offset;
+{
+  long days, rem;
+  register int y;
+  register unsigned short int *ip;
+
+  days = *t / SECS_PER_DAY;
+  rem = *t % SECS_PER_DAY;
+  rem += offset;
+  while (rem < 0)
+    {
+      rem += SECS_PER_DAY;
+      --days;
+    }
+  while (rem >= SECS_PER_DAY)
+    {
+      rem -= SECS_PER_DAY;
+      ++days;
+    }
+  tmbuf->tm_hour = rem / SECS_PER_HOUR;
+  rem %= SECS_PER_HOUR;
+  tmbuf->tm_min = rem / 60;
+  tmbuf->tm_sec = rem % 60;
+  /* January 1, 1970 was a Thursday.  */
+  tmbuf->tm_wday = (4 + days) % 7;
+  if (tmbuf->tm_wday < 0)
+    tmbuf->tm_wday += 7;
+  y = 1970;
+  while (days >= (rem = __isleap(y) ? 366 : 365))
+    {
+      ++y;
+      days -= rem;
+    }
+  while (days < 0)
+    {
+      --y;
+      days += __isleap(y) ? 366 : 365;
+    }
+  tmbuf->tm_year = y - 1900;
+  tmbuf->tm_yday = days;
+  ip = __mon_lengths[__isleap(y)];
+  for (y = 0; days >= ip[y]; ++y)
+    days -= ip[y];
+  tmbuf->tm_mon = y;
+  tmbuf->tm_mday = days + 1;
+  tmbuf->tm_isdst = -1;
+}
+
+#endif