hf/lf tune: fix segfault when called from script

CHANGELOG.md

@@ -3,7 +3,8 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
-- Add option to set and get maximum read/write block number using `hf_mf_ultimatecard` script (@piotrva)
+- Fixed `hf/lf tune` segfault when called from script (@doegox)
+- Added option to set and get maximum read/write block number using `hf_mf_ultimatecard` script (@piotrva)
 - Added JEDEC information for SPI flash W25Q64JV (@ANTodorov)
 - Added special iclass legacy config cards in `hf iclass configcard` (@antiklesys)
 - Added simulation function to `hf iclass legrec` (@antiklesys)

client/src/ui.c

@@ -696,14 +696,18 @@ void print_progress(uint64_t count, uint64_t max, barMode_t style) {
     max = (count > max) ? count : max;
 #if defined(HAVE_READLINE)
     static int prev_cols = 0;
-    int rows;
-    rl_reset_screen_size(); // refresh Readline idea of the actual screen width
-    rl_get_screen_size(&rows, &cols);
+    int tmp_cols;
+    rl_get_screen_size(NULL, &tmp_cols);
+    // if cols==0: impossible to get screen size, e.g. when scripted
+    if (tmp_cols != 0) {
+        // don't call it if cols==0, it would segfault
+        rl_reset_screen_size(); // refresh Readline idea of the actual screen width
+        rl_get_screen_size(NULL, &cols);
 
-    if (cols < 36)
-        return;
+        if (cols < 36)
+            return;
+    }
 
-    (void) rows;
     if (prev_cols > cols) {
         PrintAndLogEx(NORMAL, _CLEAR_ _TOP_ "");
     }