correct save_y08:

- remove empty line from history
- put "" around more special characters
- save empty string as "" [bug found by Kerstin Kämpf]

pub/src/file_out.cpp

@@ -76,7 +76,7 @@ void NFileOut::Save_y08( FILE *file, POlo f )
 {
     POld fd = P2D( f );
     POlc fc = P2C( f );
-    string out;
+
     fprintf( file, "Meta:\n"
              "  format:  frida/y08 for yaml1\n"
              "  type:    %s\n",
@@ -85,7 +85,6 @@ void NFileOut::Save_y08( FILE *file, POlo f )
     fprintf( file, "History:\n" );
     for ( uint i=0; i<f->lDoc.size(); i++ )
         fprintf( file, "- %s\n", yaml(f->lDoc[i]).c_str() );
-    fprintf( file, "- \%s\n", yaml( out ).c_str() );
 
     fprintf( file, "Coord:\n" );
     fprintf( file, "  x:\n    name: %s\n    unit: %s\n", 

pub/src/mystd.cpp

@@ -75,21 +75,30 @@ string strg( char val )
 string yaml( const string s )
 // string -> yaml-output-string
 {
+    if ( s=="" )
+        return "\"\"";
     string out = s;
     uint i = 0;
     // escape "
     while( i < out.size() ){
-        if( out[i]=='"' && (i==0 || out[i-1]!='\\') )
+        if( ( out[i]=='"' || out[i]=='\'' ) && (i==0 || out[i-1]!='\\') )
             out.insert( i, "\\" );
         ++i;
     }
     // if there are special characters, put "" around
     if( s.find( '"' )!=string::npos ||
+        s.find( '\'' )!=string::npos ||
+        s.find( '\\' )!=string::npos ||
         s.find( ':' )!=string::npos ||
         s.find( '*' )!=string::npos ||
         s.find( '&' )!=string::npos ||
+        s.find( '#' )!=string::npos ||
         s.find( '>' )!=string::npos ||
-        s.find( '<' )!=string::npos
+        s.find( '<' )!=string::npos ||
+        s.find( '[' )!=string::npos ||
+        s.find( ']' )!=string::npos ||
+        s.find( '{' )!=string::npos ||
+        s.find( '}' )!=string::npos
         )
         out = '"' + out + '"';
     return out;