RE: Setjmp(), longjmp() in gnuplot

[Nigel N. <nN...@au...>]

Hi Timoth=E9e,

For my gnuplot-as-library driven from wxWidgets, I replaced=0D
bail_to_command_line() with an "extern C" routine that throws=0D
an exception back the C++ caller.  Then I wrap calls to the=0D
gnuplot subsystem with try/catch, e.g.,

  try {

    lib_do_line("set term wx");
    lib_do_line("set grid");
    lib_do_line("plot sin(x)");
   =0D
    // execute an arbitrary command string=0D
    // generated during a simulation:
    lib_do_line( cmd.c_str() );=0D

  } catch(...)  {
    // recover
  }

Nigel


----- Original Message -----
> I keep working on the wxwidgets terminal, and I am now=0D
> facing a difficult problem.=0D
>=0D
> When there are errors on a command line, gnuplot uses its=0D
> functions int_error(token, string) to inform the user and=0D
> stop parsing the command line. This function prints an=0D
> error message and then calls bail_to_command_line() which=0D
> is simply a wrapper for the standard longjmp(env) function.=0D
> This is similar to "goto", and puts the program in its=0D
> initial state by restoring the registers set in main().=0D
> --- [snip] ---


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