/* ANSI Filter */
/* Datei: agrep.c */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

static int state = 1;

int rmansi (unsigned ch)
{
switch (state)
  {
  case 1:  if (ch == '\x1b')
	      {
	      state = '[';
	      return EOF;
	      }
	   else
	      return ch;
  case '[': if (ch == '[' || ch=='='||ch== '?')
	       state = 'A';
	    else
	       state = 'N';
	    return EOF;
   case 'A': if (isdigit (ch))
		state = 'A';
	     else
	       if (ch == ';')
		  state = 'A';
	       else
		  state = 'N';
	     return EOF;
  case 'N':  state = 1;
	     break;
  default:  fprintf (stderr,"\nZustand ungültig.");
	      exit (2);
    }
}