This file is part of mingw-cross-env.
See doc/index.html for further information.

This patch has been taken from:
https://build.opensuse.org/package/view_file?file=libical-0.44-windows.patch&package=mingw32-libical&project=windows%3Amingw%3Awin32

--- libical-0.44/src/libical/icaltime.c	2009-09-27 04:38:51.000000000 +0200
+++ libical-0.44/src/libical/icaltime.c	2010-03-17 14:55:36.000000000 +0100
@@ -45,14 +45,19 @@
 #include "icaltimezone.h"
 #include "icalvalue.h"
 
-#ifdef WIN32
+#ifdef _WIN32
 #include <windows.h>
 
 #define snprintf      _snprintf
 #define strcasecmp    stricmp
 #endif
 
-#ifdef WIN32
+#ifdef HAVE_PTHREAD
+ #include <pthread.h>    
+    static pthread_mutex_t tzid_mutex = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+#ifdef _WIN32
 /* Undef the similar macro from pthread.h, it doesn't check if
  * gmtime() returns NULL.
  */
@@ -62,11 +67,6 @@
 #define gmtime_r(tp,tmp) (gmtime(tp)?(*(tmp)=*gmtime(tp),(tmp)):0)
 #endif
 
-#ifdef HAVE_PTHREAD
- #include <pthread.h>    
-    static pthread_mutex_t tzid_mutex = PTHREAD_MUTEX_INITIALIZER;
-#endif
-
 /*
  *  Function to convert a struct tm time specification
  *  to an ANSI time_t using the specified time zone.
@@ -192,18 +192,20 @@
  *
  */
 struct icaltimetype 
-icaltime_from_timet_with_zone(const time_t tm, const int is_date,
+icaltime_from_timet_with_zone(time_t tm, const int is_date,
 	const icaltimezone *zone)
 {
     struct icaltimetype tt;
     struct tm t;
     icaltimezone *utc_zone;
 
+	if (tm < 0) tm=0;
+
     utc_zone = icaltimezone_get_utc_timezone ();
 
     /* Convert the time_t to a struct tm in UTC time. We can trust gmtime
        for this. */
-#ifdef HAVE_PTHREAD
+#if defined(HAVE_PTHREAD) || defined(_WIN32)
     gmtime_r (&tm, &t);
 #else
     t = *(gmtime (&tm));
--- libical-0.44/src/libical/icaltimezone.c	2009-09-27 04:38:51.000000000 +0200
+++ libical-0.44/src/libical/icaltimezone.c	2010-03-19 14:34:25.000000000 +0100
@@ -59,6 +59,61 @@
 /** This is the toplevel directory where the timezone data is installed in. */
 #define ZONEINFO_DIRECTORY	PACKAGE_DATA_DIR "/zoneinfo"
 
+#ifdef _WIN32
+/* search for data relative to where we are installed */
+
+static HMODULE hmodule;
+
+BOOL WINAPI
+DllMain (HINSTANCE hinstDLL,
+	 DWORD     fdwReason,
+	 LPVOID    lpvReserved)
+{
+	switch (fdwReason)
+    {
+	case DLL_PROCESS_ATTACH:
+		hmodule = hinstDLL;
+		break;
+    }
+
+  return TRUE;
+}
+
+char *
+get_zoneinfo_directory (void)
+{
+	static char retval[1000];
+	static int beenhere = 0;
+
+	unsigned char *p;
+
+	if (beenhere)
+		return retval;
+
+	if (!GetModuleFileName (hmodule, (CHAR *) retval, sizeof(retval) - 10))
+		return ZONEINFO_DIRECTORY;
+
+	p = _mbsrchr ((const unsigned char *) retval, '\\');
+	*p = '\0';
+	p = _mbsrchr ((const unsigned char *) retval, '\\');
+	if (p) {
+		if (stricmp ((const char *) (p+1), "bin") == 0)
+			*p = '\0';
+	}
+	strcat (retval, "\\share\\libical\\zoneinfo");
+
+	beenhere = 1;
+
+	return retval;
+}
+
+#undef ZONEINFO_DIRECTORY
+#define ZONEINFO_DIRECTORY get_zoneinfo_directory ()
+
+#endif
+
+
+
 /** The prefix we use to uniquely identify TZIDs.
     It must begin and end with forward slashes.
  */
@@ -1943,96 +1998,7 @@
 
 static const char* get_zone_directory(void)
 {
-#ifndef WIN32
 	return zone_files_directory == NULL ? ZONEINFO_DIRECTORY : zone_files_directory;
-#else
-	wchar_t wbuffer[1000];
-	char buffer[1000], zoneinfodir[1000], dirname[1000];
-	int used_default;
-	static char *cache = NULL;
-	char *dirslash, *zislash;
-	struct stat st;
-
-	if (zone_files_directory)
-	    return zone_files_directory;
-
-	if (cache)
-	    return cache;
-
-	/* Get the filename of the application */
-	if (!GetModuleFileNameW (NULL, wbuffer, sizeof (wbuffer) / sizeof (wbuffer[0])))
-	    return ZONEINFO_DIRECTORY;
-
-	/* Convert to system codepage */
-	if (!WideCharToMultiByte (CP_ACP, 0, wbuffer, -1, buffer, sizeof (buffer),
-				  NULL, &used_default) ||
-	    used_default) {
-	    /* Failed, try 8.3 format */
-	    if (!GetShortPathNameW (wbuffer, wbuffer,
-				    sizeof (wbuffer) / sizeof (wbuffer[0])) ||
-		!WideCharToMultiByte (CP_ACP, 0, wbuffer, -1, buffer, sizeof (buffer),
-				      NULL, &used_default) ||
-		used_default)
-		return ZONEINFO_DIRECTORY;
-	}
-	/* Look for the zoneinfo directory somewhere in the path where
-	 * the app is installed. If the path to the app is
-	 *
-	 *	C:\opt\evo-2.6\bin\evolution-2.6.exe 
-	 *
-	 * and the compile-time ZONEINFO_DIRECTORY is
-	 *
-	 *	C:/devel/target/evo/share/evolution-data-server-1.6/zoneinfo,
-	 *
-	 * we check the pathnames:
-	 *
-	 *	C:\opt\evo-2.6/devel/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt\evo-2.6/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt\evo-2.6/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt\evo-2.6/share/evolution-data-server-1.6/zoneinfo		<===
-	 *	C:\opt\evo-2.6/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt\evo-2.6/zoneinfo
-	 *	C:\opt/devel/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt/share/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt/evolution-data-server-1.6/zoneinfo
-	 *	C:\opt/zoneinfo
-	 *	C:/devel/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:/target/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:/evo/share/evolution-data-server-1.6/zoneinfo
-	 *	C:/share/evolution-data-server-1.6/zoneinfo
-	 *	C:/evolution-data-server-1.6/zoneinfo
-	 *	C:/zoneinfo
-	 *
-	 * In Evolution's case, we would get a match already at the
-	 * fourth pathname check.
-	 */
-
-	/* Strip away basename of app .exe first */
-	dirslash = _mbsrchr (buffer, '\\');
-	if (dirslash)
-	    *dirslash = '\0';
-
-	while ((dirslash = _mbsrchr (buffer, '\\'))) {
-	    /* Strip one more directory from app .exe location */
-	    *dirslash = '\0';
-	    
-	    strcpy (zoneinfodir, ZONEINFO_DIRECTORY);
-	    while ((zislash = _mbschr (zoneinfodir, '/'))) {
-		*zislash = '.';
-		strcpy (dirname, buffer);
-		strcat (dirname, "/");
-		strcat (dirname, zislash + 1);
-		if (stat (dirname, &st) == 0 &&
-		    S_ISDIR (st.st_mode)) {
-		    cache = strdup (dirname);
-		    return cache;
-		}
-	    }
-	}
-	return ZONEINFO_DIRECTORY;
-#endif
 }
 
 void set_zone_directory(char *path)
--- libical-0.44/src/libical/icaltz-util.c	2010-03-17 15:04:14.000000000 +0100
+++ libical-0.44/src/libical/icaltz-util.c	2010-03-19 14:38:56.000000000 +0100
@@ -41,6 +42,10 @@
 #include <libical/icalerror.h>
 #include <icaltz-util.h>
 
+/** This is the filename of the file containing the city names and
+    coordinates of all the builtin timezones. */
+#define ZONES_TAB_FILENAME	"zones.tab"
+
 typedef struct 
 {
 	char	ttisgmtcnt [4];	
@@ -53,7 +58,7 @@
 
 static int r_pos [] = {1, 2, 3, -2, -1};
 
-static char *search_paths [] = {"/usr/share/zoneinfo","/usr/lib/zoneinfo","/etc/zoneinfo","/usr/share/lib/zoneinfo"};
+static char *search_paths [] = {"/usr/share/zoneinfo","/usr/lib/zoneinfo","/etc/zoneinfo","/usr/share/lib/zoneinfo",PACKAGE_DATA_DIR "/zoneinfo"};
 static char *zdir = NULL;
 
 #define NUM_SEARCH_PATHS (sizeof (search_paths)/ sizeof (search_paths [0]))
@@ -174,12 +179,24 @@
 	return;
 }
 
+#ifdef _WIN32
+char * get_zoneinfo_directory		(void);
+#endif
+
 static void
 set_zone_directory (void)
 {
 	char file_path[PATH_MAX];
-	const char *fname = ZONES_TAB_SYSTEM_FILENAME;
+
+#ifdef _WIN32
+	const char *fname = ZONES_TAB_FILENAME;
+
+	sprintf (file_path, "%s\\%s", get_zoneinfo_directory(), fname);
+	if (!access (file_path, F_OK|R_OK))
+		zdir = strdup(get_zoneinfo_directory());
+#else
 	int i;	
+	const char *fname = ZONES_TAB_SYSTEM_FILENAME;
 
 	for (i = 0;i < NUM_SEARCH_PATHS; i++) {
 		sprintf (file_path, "%s/%s", search_paths [i], fname);
@@ -188,6 +205,7 @@
 			break;
 		}
 	}
+#endif
 }