Reformulate 42903 using an if statement.

Modules/posixmodule.c

@@ -1640,7 +1640,7 @@ posix_listdir(PyObject *self, PyObject *args)
 
 	PyObject *d, *v;
 	HANDLE hFindFile;
-	BOOL result = FALSE;
+	BOOL result;
 	WIN32_FIND_DATA FileData;
 	/* MAX_PATH characters could mean a bigger encoded string */
 	char namebuf[MAX_PATH*2+5];
@@ -1675,11 +1675,9 @@ posix_listdir(PyObject *self, PyObject *args)
 				return win32_error_unicode("FindFirstFileW", wnamebuf);
 			}
 			do {
-				if (wFileData.cFileName[0] == L'.' &&
-					(wFileData.cFileName[1] == L'\0' ||
-					 wFileData.cFileName[1] == L'.' &&
-					 wFileData.cFileName[2] == L'\0'))
-					goto loop_w;
+				/* Skip over . and .. */
+				if (wcscmp(wFileData.cFileName, L".") != 0 &&
+				    wcscmp(wFileData.cFileName, L"..") != 0) {
 					v = PyUnicode_FromUnicode(wFileData.cFileName, wcslen(wFileData.cFileName));
 					if (v == NULL) {
 						Py_DECREF(d);
@@ -1693,7 +1691,7 @@ posix_listdir(PyObject *self, PyObject *args)
 						break;
 					}
 					Py_DECREF(v);
-loop_w:
+				}
 				Py_BEGIN_ALLOW_THREADS
 				result = FindNextFileW(hFindFile, &wFileData);
 				Py_END_ALLOW_THREADS
@@ -1733,11 +1731,9 @@ loop_w:
 		return win32_error("FindFirstFile", namebuf);
 	}
 	do {
-		if (FileData.cFileName[0] == '.' &&
-		    (FileData.cFileName[1] == '\0' ||
-		     FileData.cFileName[1] == '.' &&
-		     FileData.cFileName[2] == '\0'))
-			goto loop_a;
+		/* Skip over . and .. */
+		if (strcmp(FileData.cFileName, ".") != 0 &&
+		    strcmp(FileData.cFileName, "..") != 0) {
 			v = PyString_FromString(FileData.cFileName);
 			if (v == NULL) {
 				Py_DECREF(d);
@@ -1751,7 +1747,7 @@ loop_w:
 				break;
 			}
 			Py_DECREF(v);
-loop_a:
+		}
 		Py_BEGIN_ALLOW_THREADS
 		result = FindNextFile(hFindFile, &FileData);
 		Py_END_ALLOW_THREADS