fix possible memory leaking

php_micro_fileinfo.c

@@ -586,7 +586,35 @@ const wchar_t *micro_get_filename_w() {
 }
 
 const char *micro_get_filename(void) {
- return php_win32_cp_w_to_utf8(micro_get_filename_w());
+ static char *self_filename = NULL;
+ if (NULL != self_filename) {
+ return self_filename;
+ }
+ int self_filename_len;
+ LPWCH self_filename_w = micro_get_filename_w();
+ if (NULL == self_filename_w) {
+ return NULL;
+ }
+
+ self_filename_len = WideCharToMultiByte(CP_UTF8, 0, self_filename_w, -1, NULL, 0, NULL, NULL);
+ if (0 == self_filename_len) {
+ // null string? wtf?
+ return NULL;
+ }
+
+ self_filename = malloc(self_filename_len);
+ if (NULL == self_filename) {
+ // impossible
+ return NULL;
+ }
+
+ if (0 == WideCharToMultiByte(CP_UTF8, 0, self_filename_w, -1, self_filename, self_filename_len, NULL, NULL)) {
+ // impossible
+ free(self_filename);
+ return NULL;
+ }
+
+ return self_filename;
 }
 
 #elif defined(__linux) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)