1 files changed, 113 insertions, 0 deletions
diff --git a/unix/boot/bootlib/ostime.c b/unix/boot/bootlib/ostime.c
new file mode 100644
index 00000000..8ae97df7
--- /dev/null
+++ b/unix/boot/bootlib/ostime.c
@@ -0,0 +1,113 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#include <sys/types.h>
+#ifdef SYSV
+#include <time.h>
+#else
+#include <sys/time.h>
+#include <sys/timeb.h>
+#endif
+
+#ifdef MACOSX
+#include <time.h>
+#endif
+
+#define	SECONDS_1970_TO_1980	315532800L
+static	long os_timezone();
+
+
+/* OS_UTIME -- Convert IRAF time (local standard, epoch 1980) to UNIX time
+ * (greenwich mean time, epoch 1970).	[MACHDEP]
+ *
+ * NOTE: If this is difficult to implement on your system, you can probably
+ * forget about the correction to Greenwich (e.g., 7 hours) and that for
+ * daylight savings time (1 hour), and file times will come out a bit off
+ * but it probably won't matter.
+ */
+long
+os_utime (long iraf_time)
+{
+	struct	tm *localtime();
+	time_t	time_var, lst;
+#ifdef AUX
+	long	lstl;
+#endif
+
+	lst = (time_t)iraf_time;
+	
+	/* Add minutes westward from GMT */
+	time_var = lst + os_timezone();
+
+	/* Correct for daylight savings time, if in effect */
+#ifdef AUX
+	lstl = (long)lst;
+	if (localtime(&lstl)->tm_isdst)
+#else
+	if (localtime(&lst)->tm_isdst)
+#endif
+	    time_var += 60L * 60L;
+
+	return ((long)time_var + SECONDS_1970_TO_1980);
+}
+
+
+/* OS_ITIME -- Convert UNIX time (gmt, epoch 1970) to IRAF time (lst, epoch
+ * 1980).	[MACHDEP]
+ */
+long
+os_itime (long unix_time)
+{
+	struct	tm *localtime();
+	time_t	time_var, gmt;
+#ifdef AUX
+	long	gmtl;
+#endif
+
+	gmt = (time_t)unix_time;
+	
+	/* Subtract minutes westward from GMT */
+	time_var = gmt - os_timezone();
+
+	/* Correct for daylight savings time, if in effect */
+#ifdef AUX
+	gmtl = (long)gmt;
+	if (localtime(&gmtl)->tm_isdst)
+#else
+	if (localtime(&gmt)->tm_isdst)
+#endif
+	    time_var -= 60L * 60L;
+
+	return ((long)time_var - SECONDS_1970_TO_1980);
+}
+
+
+/* OS_GTIMEZONE -- Get the local timezone, measured in seconds westward
+ * from Greenwich, ignoring daylight savings time if in effect.
+ */
+static long
+os_timezone()
+{
+#ifdef CYGWIN
+	extern	long _timezone;
+	return (_timezone);
+#else
+#if defined(SOLARIS) && defined(X86)
+	extern	long timezone;
+	return (timezone);
+
+#else
+#if defined(SYSV) || defined(MACOSX)
+	struct tm *tm;
+	time_t clock;
+	clock = time(NULL);
+	tm = gmtime (&clock);
+	return (-(tm->tm_gmtoff));
+#else
+	struct	timeb time_info;
+	ftime (&time_info);
+	return (time_info.timezone * 60);
+#endif
+#endif
+#endif
+}