fix bug #39458: ftp_nlist() returns false on empty dirs

Author: nunoplopes

ext/ftp/ftp.c

@@ -1614,10 +1614,15 @@ ftp_genlist(ftpbuf_t *ftp, const char *cmd, const char *path TSRMLS_DC)
 	if (!ftp_putcmd(ftp, cmd, path)) {
 		goto bail;
 	}
-	if (!ftp_getresp(ftp) || (ftp->resp != 150 && ftp->resp != 125)) {
+	if (!ftp_getresp(ftp) || (ftp->resp != 150 && ftp->resp != 125 && ftp->resp != 226)) {
 		goto bail;
 	}
 
+	/* some servers don't open a ftp-data connection if the directory is empty */
+	if (ftp->resp == 226) {
+		return ecalloc(1, sizeof(char**));
+	}
+
 	/* pull data buffer into tmpfile */
 	if ((data = data_accept(data, ftp TSRMLS_CC)) == NULL) {
 		goto bail;