gmtime now thread safe

Makefile

@@ -414,8 +414,7 @@ OBJLIST =									\
 	${OBJDIR}httplib_pthread_mutex_unlock${OBJEXT}				\
 	${OBJDIR}httplib_pthread_self${OBJEXT}					\
 	${OBJDIR}httplib_pthread_setspecific${OBJEXT}				\
-	${OBJDIR}wince_gmtime${OBJEXT}						\
-	${OBJDIR}wince_gmtime_s${OBJEXT}					\
+	${OBJDIR}httplib_gmtime_r${OBJEXT}					\
 	${OBJDIR}httplib_localtime_r${OBJEXT}					\
 	${OBJDIR}wince_rename${OBJEXT}						\
 	${OBJDIR}wince_stat${OBJEXT}						\
@@ -1482,11 +1481,7 @@ ${OBJDIR}httplib_pthread_setspecific${OBJEXT}				: ${SRCDIR}httplib_pthread_sets
 									  ${SRCDIR}httplib_main.h					\
 									  ${INCDIR}libhttp.h
 
-${OBJDIR}wince_gmtime${OBJEXT}						: ${SRCDIR}wince_gmtime.c					\
-									  ${SRCDIR}httplib_main.h					\
-									  ${INCDIR}libhttp.h
-
-${OBJDIR}wince_gmtime_s${OBJEXT}					: ${SRCDIR}wince_gmtime_s.c					\
+${OBJDIR}httplib_gmtime_r${OBJEXT}					: ${SRCDIR}httplib_gmtime_r.c					\
 									  ${SRCDIR}httplib_main.h					\
 									  ${SRCDIR}httplib_utils.h					\
 									  ${INCDIR}libhttp.h

include/libhttp.h

@@ -917,6 +917,7 @@ LIBHTTP_API enum debug_level_t		httplib_get_debug_level( struct httplib_context
 LIBHTTP_API const char *		httplib_get_option( const struct httplib_context *ctx, const char *name, char *buffer, size_t buflen );
 LIBHTTP_API uint64_t			httplib_get_random( void );
 LIBHTTP_API void *			httplib_get_user_connection_data( const struct httplib_connection *conn );
+LIBHTTP_API struct tm *			httplib_gmtime_r( const time_t *clock, struct tm *result );
 LIBHTTP_API int				httplib_kill( pid_t pid, int sig_num );
 LIBHTTP_API struct tm *			httplib_localtime_r( const time_t *clock, struct tm *result );
 LIBHTTP_API int				httplib_mkdir( const char *path, int mode );

src/httplib_gmt_time_string.c

@@ -33,13 +33,11 @@
  * included in all responses other than 100, 101, 5xx. */
 void XX_httplib_gmt_time_string( char *buf, size_t buf_len, time_t *t ) {
 
-	struct tm *tm;
+	struct tm tmm;
 
 	if ( buf == NULL  ||  buf_len < 1 ) return;
 
-	tm = ( t != NULL ) ? gmtime(t) : NULL;
-
-	if ( tm != NULL ) strftime( buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", tm );
+	if ( httplib_gmtime_r( t, &tmm ) != NULL ) strftime( buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", &tmm );
 	 
 	else {
 		httplib_strlcpy( buf, "Thu, 01 Jan 1970 00:00:00 GMT", buf_len );

src/httplib_gmtime_r.c

@@ -28,46 +28,54 @@
 #include "httplib_main.h"
 #include "httplib_utils.h"
 
-#if defined(_WIN32_WCE)
-
 /*
- * struct tm *gmtime_s( const time_t *ptime, struct tm *ptm );
+ * struct tm *httplib_gmtime_r( const time_t *clock, struct tm *result );
  *
- * The function gmtime_s() converts a number of seconds since the EPOCH to
- * a tm time structure. This standard function is not available on all
- * platforms and this implementation provides the functionality for Windows CE.
+ * The function httplib_gmtime_r() returns a converted time to tm structure.
+ * No timezone conversion takes place. UTC as zone is assumed.
  */
 
-struct tm * gmtime_s( const time_t *ptime, struct tm *ptm ) {
+struct tm * httplib_gmtime_r( const time_t *clock, struct tm *result ) {
+
+#if defined(_WIN32_CE)
 
 	int a;
 	int doy;
 	FILETIME ft;
 	SYSTEMTIME st;
 	
-	if ( ptime == NULL  ||  ptm == NULL ) return NULL;
+	if ( clock == NULL  ||  result == NULL ) return NULL;
 
-	*(int64_t)&ft = ((int64_t)*ptime) * RATE_DIFF * EPOCH_DIFF;
+	*(int64_t)&ft = ((int64_t)*clock) * RATE_DIFF * EPOCH_DIFF;
 
 	FileTimeToSystemTime( & ft, & st );
 
-	ptm->tm_year  = st.wYear  - 1900;
-	ptm->tm_mon   = st.wMonth - 1;
-	ptm->tm_wday  = st.wDayOfWeek;
-	ptm->tm_mday  = st.wDay;
-	ptm->tm_hour  = st.wHour;
-	ptm->tm_min   = st.wMinute;
-	ptm->tm_sec   = st.wSecond;
-	ptm->tm_isdst = false;
+	result->tm_year  = st.wYear  - 1900;
+	result->tm_mon   = st.wMonth - 1;
+	result->tm_wday  = st.wDayOfWeek;
+	result->tm_mday  = st.wDay;
+	result->tm_hour  = st.wHour;
+	result->tm_min   = st.wMinute;
+	result->tm_sec   = st.wSecond;
+	result->tm_isdst = false;
 
-	doy           = ptm->tm_mday;
-	for (a=0; a<ptm->tm_mon; a++) doy += days_per_month[a];
-	if ( ptm->tm_mon >= 2  &&  LEAP_YEAR( ptm->tm_year+1900 ) ) doy++;
+	doy              = result->tm_mday;
+	for (a=0; a<result->tm_mon; a++) doy += days_per_month[a];
+	if ( result->tm_mon >= 2  &&  LEAP_YEAR( result->tm_year+1900 ) ) doy++;
 
-	ptm->tm_yday  = doy;
+	result->tm_yday  = doy;
 
-	return ptm;
+	return result;
 
-}  /* gmtime_s */
+#elif defined(_WIN32)
 
-#endif /* defined(_WIN32_WCE) */
+	if ( gmtime_s( result, clock ) == 0 ) return result;
+	return NULL;
+
+#else
+
+	return gmtime_r( clock, result );
+
+#endif
+
+}  /* httplib_gmtime_r */

src/wince_gmtime.c

@@ -1,51 +0,0 @@
-/* 
- * Copyright (c) 2016 Lammert Bies
- * Copyright (c) 2013-2016 the Civetweb developers
- * Copyright (c) 2004-2013 Sergey Lyubka
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * ============
- * Release: 2.0
- */
-
-#include "httplib_main.h"
-
-#if defined(_WIN32_WCE)
-
-/*
- * struct tm *gmtime( const time_t *ptime );
- *
- * The function gmtime() is a system function which converts the number since
- * EPOCH to a time structure based on UTC. This function is not available on
- * all platforms and the implementation here can be used on Windows CE. Please
- * note that this implementation is nut fully thread safe if the function is
- * also called from threads which have been started outside of LibHTTP.
- */
-
-struct tm *gmtime( const time_t *ptime ) {
-
-	int i;
-
-	i = XX_httplib_atomic_inc(&XX_httplib_tm_index) % MAX_WORKER_THREADS;
-	return gmtime_s( ptime, XX_httplib_tm_array + i );
-
-}  /* gmtime */
-
-#endif /* defined(_WIN32_WCE) */