# HG changeset patch
# User Michał Kępień <bitbucket@kempniu.pl>
# Date 1537815849 -7200
# Node ID c5665d3191aa5250d4b5c44a4ecc50efd5a49140
# Parent  4ddd6f5c3ffcf471ed93e49fa1b392cf997f9926
Prevent assigning negative values to unsigned variables

diff -r 4ddd6f5c3ffc -r c5665d3191aa mcabber/mcabber/screen.c
--- a/mcabber/mcabber/screen.c	Sun Sep 23 22:52:29 2018 +0200
+++ b/mcabber/mcabber/screen.c	Mon Sep 24 21:04:09 2018 +0200
@@ -917,7 +917,8 @@
 
 guint scr_gettextwidth(void)
 {
-  return maxX - Roster_Width - scr_getprefixwidth();
+  int used_width = Roster_Width + scr_getprefixwidth();
+  return maxX > used_width ? maxX - used_width : 0;
 }
 
 guint scr_gettextheight(void)
@@ -1094,8 +1095,7 @@
     g_free(id);
   } else {  // Load buddy history from file (if enabled)
     tmp->bd = g_new0(buffdata, 1);
-    hlog_read_history(title, &tmp->bd->hbuf,
-                      maxX - Roster_Width - scr_getprefixwidth());
+    hlog_read_history(title, &tmp->bd->hbuf, scr_gettextwidth());
 
     // Set a readmark to separate new content
     hbuf_set_readmark(tmp->bd->hbuf, TRUE);
@@ -1536,8 +1536,7 @@
     g_free(nicktmp);
   }
   hbuf_add_line(&win_entry->bd->hbuf, text_locale, timestamp, prefix_flags,
-                maxX - Roster_Width - scr_getprefixwidth(), num_history_blocks,
-                mucnicklen, xep184);
+                scr_gettextwidth(), num_history_blocks, mucnicklen, xep184);
   g_free(text_locale);
 
   if (win_entry->bd->cleared) {