/* helpnstate.c -- get state numbers

   Copyright 2009 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include "errnums.h"
#include "statenums.h"

int  helpnstate(const int current_state)
{
	int	ch, result, hadeof = 0;

	for  (;;)  {
		ch = getc(Cfile);
		if  (ch == EOF)  {
			if  (hadeof)
				return  0;	/* Invalid result */
			hadeof++;
			fseek(Cfile, 0L, 0);
			continue;
		}

		/* If line doesn't start with a digit ignore it */

		if  (!isdigit(ch) && ch != '-')  {
			while  (ch != '\n'  &&  ch != EOF)
				ch = getc(Cfile);
			continue;
		}

		/* Read leading state number.
		   If not current state forget it */

		ungetc(ch, Cfile);
		if  (helprdn() != current_state)  {
			do  ch = getc(Cfile);
			while  (ch != '\n' && ch != EOF);
			continue;
		}
		ch = getc(Cfile);

		/* Only interested in 'N's */

		if  (ch == 'N'  ||  ch == 'n')  {
			result = helprdn();
			do  ch = getc(Cfile);
			while  (ch != '\n'  &&  ch != EOF);
			return  result;
		}
		while  (ch != '\n'  &&  ch != EOF)
			ch = getc(Cfile);
	}
}
