add gmt_mktime to support new asn1 code

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@3952 dc483132-0cff-0310-8789-dd5450dbe970

src/lib/krb5/os/ChangeLog

@@ -1,3 +1,9 @@
+Wed Jul  6 13:26:59 1994  Mark Eichin  (eichin@cygnus.com)
+
+	* gmt_mktime.c (gmt_mktime): New file, new function. Similar to
+	POSIX mktime, but always works in GMT.
+	configure.in, Makefile.in: build gmt_mktime.
+
 Wed Jun 22 15:49:30 1994  Theodore Y. Ts'o  (tytso at tsx-11)
 
 	* locate_kdc.c (krb5_locate_kdc): Fixed default port numbers so

src/lib/krb5/os/Makefile.in

@@ -13,6 +13,7 @@ OBJS= \
 	get_krbhst.o	\
 	gen_port.o	\
 	gen_rname.o	\
+	gmt_mktime.o	\
 	hst_realm.o	\
 	krbfileio.o	\
 	ktdefname.o	\
@@ -44,6 +45,7 @@ SRCS= \
 	$(srcdir)/get_krbhst.c	\
 	$(srcdir)/gen_port.c	\
 	$(srcdir)/gen_rname.c	\
+	$(srcdir)/gmt_mktime.c	\
 	$(srcdir)/hst_realm.c	\
 	$(srcdir)/krbfileio.c	\
 	$(srcdir)/ktdefname.c	\

src/lib/krb5/os/configure.in

@@ -1,4 +1,9 @@
 AC_INIT(configure.in)
+dnl time checks are for timeofday.c (which gets them from osconf.h)
+dnl and gmt_mktime.c (which only gets them from here...)
+AC_TIME_WITH_SYS_TIME
+AC_HEADER_CHECK(sys/time.h,AC_DEFINE(USE_SYS_TIME_H))
+AC_HEADER_EGREP(time_t, sys/types.h, AC_DEFINE(POSIX_TYPES))
 WITH_CCOPTS
 AC_SET_BUILDTOP
 CONFIG_RULES

src/lib/krb5/os/gmt_mktime.c

@@ -0,0 +1,74 @@
+/* This code placed in the public domain by Mark W. Eichin */
+
+#include <stdio.h>
+
+#include <sys/types.h>
+#include <time.h>
+#ifdef USE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+/* take a struct tm, return seconds from GMT epoch */
+/* like mktime, this ignores tm_wday and tm_yday. */
+/* unlike mktime, this does not set them... it only passes a return value. */
+
+static days_in_month[12] = {
+0,				/* jan 31 */
+31,				/* feb 28 */
+59,				/* mar 31 */
+90,				/* apr 30 */
+120,				/* may 31 */
+151,				/* jun 30 */
+181,				/* jul 31 */
+212,				/* aug 31 */
+243,				/* sep 30 */
+273,				/* oct 31 */
+304,				/* nov 30 */
+334				/* dec 31 */
+};
+
+#define hasleapday(year) (year%400?(year%100?(year%4?0:1):0):1)
+
+time_t gmt_mktime(t)
+     struct tm* t;
+{
+  time_t accum;
+
+#define assert_time(cnd) if(!(cnd)) return -1
+
+  assert_time(t->tm_year>=70);
+  assert_time(t->tm_year<=138);
+  assert_time(t->tm_mon>=0);
+  assert_time(t->tm_mon<=11);
+  assert_time(t->tm_mday>=0);
+  assert_time(t->tm_mday<=31);
+  assert_time(t->tm_hour>=0);
+  assert_time(t->tm_hour<=23);
+  assert_time(t->tm_min>=0);
+  assert_time(t->tm_min<=59);
+  assert_time(t->tm_sec>=0);
+  assert_time(t->tm_sec<=62);
+
+#undef assert_time
+
+
+  accum = t->tm_year - 70;
+  accum *= 365;			/* 365 days/normal year */
+
+  /* add in leap day for all previous years */
+  accum += (t->tm_year - 68) / 4;
+  /* add in leap day for this year */
+  if(t->tm_mon >= 2)		/* march or later */
+    if(hasleapday(t->tm_year)) accum += 1;
+
+  accum += days_in_month[t->tm_mon];
+  accum += t->tm_mday-1;	/* days of month are the only 1-based field */
+  accum *= 24;			/* 24 hour/day */
+  accum += t->tm_hour;
+  accum *= 60;			/* 60 minute/hour */
+  accum += t->tm_min;
+  accum *= 60;			/* 60 seconds/minute */
+  accum += t->tm_sec;
+
+  return accum;
+}