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[STR New]

Link: https://www.fltk.org/str.php?L3519
Version: 1.3.4


I had this problem in all versions up to 1.3.4 but until now I could not
demonstrate it in a simple program.

The problem is as follows: My application crashes with an "Segmentation
fault" when I try to print following characters:

//  U+03B9 Greek small letter Iota
//  U+207D Superscript left parenthesis
//  U+207E ... right ...
//  U+208D Subscript left parenthesis
//  U+208E ... right ...

The crash only happens when one of these chars is the last char in a
string. Unfortunately this happens often in my page formating methode when
it tries to figure out, how many words will fit in a line.

In the editor window all looks fine. Maybe it helps to know that all these
chars are of verry low width.

The debugger (ddd) message says:
Thread 1 "zk3" received signal SIGSEGV, Segmentation fault.
0x0000000000466381 in
Fl_PostScript_Graphics_Driver::transformed_draw_extra(char const*, int,
double, double, int, bool) ()
(gdb)

Sorry, for cannot supply more information.

Manfred


Link: https://www.fltk.org/str.php?L3519
Version: 1.3.4

//  FLTK printer crash demo
//
//  Crash happens with the following unicode chars:
//  U+03B9 Greek small letter Iota
//  U+207D Superscript left parenthesis
//  U+207E ... right ...
//  U+208D Subscript left parenthesis
//  U+208E ... right ...
//
//  Crash only happens when one these letters is the last one in a string.
//
//      fltk-config  -g --compile print_err.cpp


#include <FL/Fl.H>
#include <FL/Fl_Printer.H>

#include <cstring>

//const char * test_str = "\u207D";
//const char * test_str = "\u207D\n";
//const char * test_str = "abc\n";
//const char * test_str = " \u207D U+207D (8317) hochgestellte Klammer links";
const char * test_str = "\u207D";
const char * test_str2 = " U+207D (8317) hochgestellte Klammer links";

int main( int argc, char * argv[] ) {
    int     pr_w, pr_h;
    int     ml, mt, mr, mb;     // the margins (from system printer setup)
    int     x = 72; // left position in pt
    int     y = 72;
    const char * txt;
    double  dx;
    Fl_Printer * pr = new Fl_Printer();

    if( argc > 1 )
        txt = argv[1];
    else
        txt = test_str;

    if( pr->start_job( 1 ) == 0 ) {
        if( pr->printable_rect( &pr_w, &pr_h ) == 0 ) {
            pr->margins( &ml, &mt, &mr, &mb );
            pr->start_page();
            fl_font( FL_HELVETICA, 14 );
            dx = fl_width( txt );
            fprintf( stderr, "dx: %4.1f\n", dx );
            fl_draw( txt, x, y );

            if( argc == 1 ) {
                x += dx;
                dx = fl_width( test_str2 );
                fprintf( stderr, "dx: %4.1f\n", dx );
                fl_draw( test_str2, x, y );
            }

            pr->end_page();
        }
        pr->end_job();
    }
    delete pr;
    return 0;
}