[PATCH v2 3/3] mingw: use {gm,local}time_s as backend for {gm,local}time_r

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Since Windows doesn't provide gmtime_r(3) and localtime_r(3),
we're providing a compat version by using non-reentrant gmtime(3) and
localtime(3) as backend. Then, we copy the returned data into the
buffer.

By doing that, in case of failure, we will dereference a NULL pointer
returned by gmtime(3), and localtime(3), and we always return a valid
pointer instead of NULL.

Drop the memcpy(3) by using gmtime_s, and localtime_s as backend on
Windows, and make sure we will return NULL in case of failure.

Cc: Johannes Sixt <j6t@xxxxxxxx>
Cc: Johannes Schindelin <Johannes.Schindelin@xxxxxx>
Signed-off-by: Doan Tran Cong Danh <congdanhqx@xxxxxxxxx>
---
 compat/mingw.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index fe609239dd..75695a24a3 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -986,16 +986,16 @@ int pipe(int filedes[2])
 
 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 {
-	/* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
-	memcpy(result, gmtime(timep), sizeof(struct tm));
-	return result;
+	if (gmtime_s(result, timep) == 0)
+		return result;
+	return NULL;
 }
 
 struct tm *localtime_r(const time_t *timep, struct tm *result)
 {
-	/* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
-	memcpy(result, localtime(timep), sizeof(struct tm));
-	return result;
+	if (localtime_s(result, timep) == 0)
+		return result;
+	return NULL;
 }
 
 char *mingw_getcwd(char *pointer, int len)
-- 
2.24.0.615.g37f5bfbdea




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