#include <stdio.h>                           /* for standard I/O */
#include <stdlib.h>                          /* for stuff in stdlib */
#include <unistd.h>                          /* read() and whatnot */
#include <signal.h>                          /* for sighandlers */
#include <sys/types.h>                       /* lame */
#include <sys/wait.h>                        /* and lame */
#include "mysh.h"                            /* header for this file */


/******************************************************************************
* Name:       Chris Mooney, chris@dod.net                                     *
* Course:     COS350, T-Th 2:45 - 4:00                                        *
* Project:    #5                                                              *
* File Name:  mysh.c                                                          *
*                                                                             *
* Specification:                                                              *
*  Just a basic shell.                                                        *
*                                                                             *
* You can find these files at:                                                *
* - [http://chris.dod.net/src/cos350/hw5/]                                    *
*                                                                             *
* GNU Public License Information:                                             *
*                                                                             *
* 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, 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.                                                               *
*                                                                             *
* For a copy of the GPL, write to the Free Software Foundation,               *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.                    *
*                                                                             *
* Chris Mooney ....................... UNIX Systems Engineer                  *
* Project DoD ........................ http://home.dod.net/                   *
* P.O. Box 7012 ...................... Tel: (207) 450-2332                    *
* Portland, ME 04112 ................. chris@dod.net                          *
*                                                                             *
* My PGP Public Key Block can be found at:                                    *
* http://chris.dod.net/pgp-public-key.asc                                     *
*                                                                             *
* Fingerprint: E5C2 E88A CED4 02CB 9D3C  8316 1001 E946 B592 F11C             *
*******************************************************************************/


#define	DFL_PROMPT	"mysh% "             /* changed this to my fancy */

int proc_count = 0;                          /* number of processes */

int main()
{
  char	*cmdline, *prompt, **arglist;
  int	result;
  int child_info = -1;                       /* for background processes */
  void	setup();

  prompt = DFL_PROMPT ;
  setup();

  while((cmdline = (char *)next_cmd(prompt, stdin)) != NULL)
  {
    if ( (arglist = (char **)splitline(cmdline)) != NULL  ){
      result = execute(arglist);
      freelist(arglist);
    }

    /* the following is a check to see if a background process exitsts,
       did it exit */
    while((result = waitpid(-1, &child_info, WNOHANG)) > 0)
    {
      /* if there is a process and it completes or throws an error, then do
         the following */
      if(proc_count != 0)
      {
        printf("[%d]\tDone\n", result);
        proc_count--;
      }
    }

    free(cmdline);
  }
  return 0;
}

void setup()
/*
 * purpose: initialize shell
 * returns: nothing. calls fatal() if trouble
 */
{
  signal(SIGINT,  SIG_IGN);
  signal(SIGQUIT, SIG_IGN);
}

void fatal(char *s1, char *s2, int n)
{
  fprintf(stderr,"Error: %s,%s\n", s1, s2);
  exit(n);
}