Simplified temp filename generation.

3rdparty/libjasper/jas_stream.c

@@ -345,6 +345,7 @@ jas_stream_t *jas_stream_tmpfile()
 {
     jas_stream_t *stream;
     jas_stream_fileobj_t *obj;
+    char *tmpname;
 
     if (!(stream = jas_stream_create())) {
         return 0;
@@ -365,14 +366,12 @@ jas_stream_t *jas_stream_tmpfile()
 
 #ifdef _WIN32
     /* Choose a file name. */
-    char lpTempPathBuffer[MAX_PATH];
-    const DWORD dwRetVal = GetTempPath(MAX_PATH, lpTempPathBuffer);
+    tmpname = tempnam(NULL, NULL);
+    strcpy(obj->pathname, tmpname);
+    free(tmpname);
 
     /* Open the underlying file. */
-    if (dwRetVal >= MAX_PATH || dwRetVal == 0 ||
-        sprintf_s(obj->pathname, MAX_PATH, "%s\\tmp.XXXXXXXXXX", lpTempPathBuffer) <= 0 ||
-        _mktemp_s(obj->pathname, MAX_PATH) ||
-        (obj->fd = open(obj->pathname, O_CREAT | O_EXCL | O_RDWR | O_TRUNC | O_BINARY | O_TEMPORARY | _O_SHORT_LIVED,
+    if ((obj->fd = open(obj->pathname, O_CREAT | O_EXCL | O_RDWR | O_TRUNC | O_BINARY | O_TEMPORARY | _O_SHORT_LIVED,
       JAS_STREAM_PERMS)) < 0) {
         jas_stream_destroy(stream);
         return 0;