From 5d9e481dff798103567399f310b54c5928849466 Mon Sep 17 00:00:00 2001
From: Vreixo Formoso <metalpain2002@yahoo.es>
Date: Sun, 27 Jan 2008 14:41:52 +0100
Subject: [PATCH] Check for non standard timegm, and replace it if not
 available.

---
 configure.ac    |  5 +++++
 libisofs/util.c | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/configure.ac b/configure.ac
index 8465b6f..b7ebea0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -98,6 +98,11 @@ AC_CHECK_MEMBER([struct tm.tm_gmtoff],
 	,
 	[#include <time.h>])
 
+AC_CHECK_DECL([timegm], 
+	[AC_DEFINE(HAVE_TIMEGM, 1, [Define this if timegm function is available])],
+	,
+	[#include <time.h>])
+
 THREAD_LIBS=-lpthread
 AC_SUBST(THREAD_LIBS)
 
diff --git a/libisofs/util.c b/libisofs/util.c
index 0f28f50..4209b83 100644
--- a/libisofs/util.c
+++ b/libisofs/util.c
@@ -1058,6 +1058,26 @@ void iso_datetime_17(unsigned char *buf, time_t t, int always_gmt)
 
 }
 
+#ifndef HAVE_TIMEGM
+static
+time_t timegm(struct tm *tm)
+{
+    time_t ret;
+    char *tz;
+
+    tz = getenv("TZ");
+    setenv("TZ", "", 1);
+    tzset();
+    ret = mktime(tm);
+    if (tz)
+        setenv("TZ", tz, 1);
+    else
+        unsetenv("TZ");
+    tzset();
+    return ret;
+}
+#endif
+
 time_t iso_datetime_read_7(const uint8_t *buf)
 {
     struct tm tm;