check whether the string is non-empty before accessing its first element

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47535 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/utils/tex2rtf/src/texutils.cpp b/utils/tex2rtf/src/texutils.cpp
index eead3b6dfcce8324754ad4b10b3dfe604842c5db..4133290545e73ad2c6d89c372026548bfbd9f7cc 100644 (file)
--- a/utils/tex2rtf/src/texutils.cpp
+++ b/utils/tex2rtf/src/texutils.cpp
@@ -479,9 +479,9 @@ void BibEatWhiteSpace(wxString& line)
     }
 
     // Ignore end-of-line comments
     }
 
     // Ignore end-of-line comments

-    if (line[0] == _T('%') || line[0] == _T(';') || line[0] == _T('#'))
+    if ( !line.empty() && (line[0] == _T('%') || line[0] == _T(';') || line[0] == _T('#')))

     {
     {

-        line = wxEmptyString;
+        line.clear();

     }
 }
 
     }
 }
 


@@ -569,7 +569,7 @@ wxString BibReadToEOL(wxString& line)
         val << line[0];
         line = line.substr(1);
     }
         val << line[0];
         line = line.substr(1);
     }

-    if (line[0] == '"')
+    if (!line.empty() && line[0] == '"')

         line = line.substr(1);
 
     return val;
         line = line.substr(1);
 
     return val;