From 258c3e81a4bd86b4bd9c11461b6565dcdc43576d Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Wed, 9 Nov 2005 21:34:04 +0000
Subject: [PATCH] Fl_Text_Display::wrap_mode() would crash if no buffer was
 associated with the widget (STR #1069)

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4647 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 CHANGES                 |  2 ++
 src/Fl_Text_Display.cxx | 31 ++++++++++++++++++++-----------
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/CHANGES b/CHANGES
index dc1eb972c..24160a4dc 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3,6 +3,8 @@ CHANGES IN FLTK 1.1.7
 	- Documentation fixes (STR #571, STR #648, STR #692, STR
 	  #730, STR #744, STR #745, STR #931, STR #942, STR #960,
 	  STR #969)
+	- Fl_Text_Display::wrap_mode() would crash if no buffer
+	  was associated with the widget (STR #1069)
 	- Updated the default label and text colors of all widgets
 	  to use FL_FOREGROUND_COLOR instead of FL_BLACK (STR
 	  #1052)
diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index fc188464b..8de05f424 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -658,19 +658,28 @@ void Fl_Text_Display::wrap_mode(int wrap, int wrapMargin) {
   mWrapMargin = wrapMargin;
   mContinuousWrap = wrap;
 
-  /* wrapping can change change the total number of lines, re-count */
-  mNBufferLines = count_lines(0, buffer()->length(), true);
+  if (buffer()) {
+    /* wrapping can change change the total number of lines, re-count */
+    mNBufferLines = count_lines(0, buffer()->length(), true);
 
-  /* changing wrap margins wrap or changing from wrapped mode to non-wrapped
-     can leave the character at the top no longer at a line start, and/or
-     change the line number */
-  mFirstChar = line_start(mFirstChar);
-  mTopLineNum = count_lines(0, mFirstChar, true) + 1;
-  reset_absolute_top_line_number();
+    /* changing wrap margins wrap or changing from wrapped mode to non-wrapped
+       can leave the character at the top no longer at a line start, and/or
+       change the line number */
+    mFirstChar = line_start(mFirstChar);
+    mTopLineNum = count_lines(0, mFirstChar, true) + 1;
 
-  /* update the line starts array */
-  calc_line_starts(0, mNVisibleLines);
-  calc_last_char();
+    reset_absolute_top_line_number();
+
+    /* update the line starts array */
+    calc_line_starts(0, mNVisibleLines);
+    calc_last_char();
+  } else {
+    // No buffer, so just clear the state info for later...
+    mNBufferLines  = 0;
+    mFirstChar     = 0;
+    mTopLineNum    = 1;
+    mAbsTopLineNum = 0;
+  }
 
   resize(x(), y(), w(), h());
 }