[Cgdb-devel] cgdb and readline

[Bob R. <bob...@co...>]

Hey guys,

Look at this small example. It reads a line at a time and prints it.

   #include <readline/readline.h>
   #include <readline/history.h>
   #include <stdlib.h>

   /* Gets called when the user hits '\t' */
   int rl_complete (int ignore, int invoking_key) {
       fprintf(stderr, "complete\n");
       return 0;
   }

   int main(int argc, char **argv){
       static char *line;
       while(1) {
           line =3D readline("PROMPT:");
           fprintf(stderr, "LINE=3D(%s)\n", line);
       }
       return 0;
   }

I am trying to integrate readline into cgdb and ran into a problem.
Readline has a function called 'readline' that gets a line of input from
stdin. This is great, however, it is a blocking call ( It reads a whole
line and then returns). This is not good, since cgdb should also be able
to receive input if the user is in cgdb mode.=20

For example, the users types 'info sour' and the ESC 'j' ( to go down a lin=
e )=20
and then 'i' ( to get back into gdb mode ) and then 'e<CR>'.=20

How would we get readline to give up control? Or feed it a char at a
time? I don't know how to resolve this problem.

By the way, currently cgdb sits in a select loop reading from stdin,
gdb's stdout, and the debugged programs stdout (tty). How could we make
readline be a part of this?

Any suggestions?

Thanks,
Bobby