/*
 * BSI interpreter base on BF interpreter.
 */

/*
 * BFI
 * Copyright (C) 2003 Thomas Cort
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Program Name:  BFI
 * Version:       1.1
 * Date:          2003-04-29
 * Description:   Interpreter for the Brainfuck Programming Language
 * License:       GPL
 * Web page:      http://www.brainfuck.ca
 * Download:      http://www.brainfuck.ca/BFI.c
 * Source Info:   http://www.brainfuck.ca/downloads.html
 * Latest Ver:    http://www.brainfuck.ca/downloads.html
 * Documentation: None
 * Help:          tom@brainfuck.ca
 * Developement:  tom@brainfuck.ca
 * Bugs:          tom@brainfuck.ca
 * Maintainer:    Thomas Cort <tom@brainfuck.ca>
 * Developer:     Thomas Cort <tom@brainfuck.ca>
 * Interfaces:    Command Line
 * Source Lang:   C
 * Build Prereq:  None
 * Related Progs: BFIwDebug
 * Category:      Software Development > Programming languages
 */

#include<stdio.h>

int main(int argc, char **argv) {
  int pc, args, xc, prog_len, l = 0;
  int x[32768];
  int p[32768];

  FILE *stream, *fopen();

  for (args = 1; args < argc; args++) {

    stream = fopen(argv[args], "r");

    prog_len = 0;

    for (pc = 0; pc < 32768 && (p[pc] = getc(stream)) != EOF; pc++)
      prog_len++;

    pc = 0;

    fclose(stream);

    for(xc = 0; xc < 32768; xc++)
      x[xc] = 0;

    xc = 0;

    for(pc = 0; pc < prog_len; pc++) {

      // '+'
      if      (p[pc] == 43) x[xc]++;

      // '-'
      else if (p[pc] == 45) x[xc]--;

      // '.'
      else if (p[pc] == 46) putchar(x[xc--]);

      // ','
      else if (p[pc] == 44) x[++xc] = getchar();

      // '0'
      else if (p[pc] == 48) x[++xc] = 0;

      // ':'
      else if (p[pc] == 58) x[xc] = x[xc-x[xc]-1];

      // '['
      else if (p[pc] == 91) {
        if (x[xc--] == 0) {
          pc++;
          while (l > 0 || p[pc] != 93) {
            if (p[pc] == 91) l++;
            if (p[pc] == 93) l--;
            pc++;
          }
        }
      }

      // ']'
      else if (p[pc] == 93) {
        pc--;
        while (l > 0 || p[pc] != 91) {
          if (p[pc] == 93) l++;
          if (p[pc] == 91) l--;
          pc--;
        }
        pc--;
      }
    }
  }
  putchar(10);
  return 0;
}