/*

    viDOOM - level editor for DOOM

    Copyright (C) 2000  Ian Cowburn (ianc@noddybox.demon.co.uk)

    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

    -------------------------------------------------------------------------

    Command execution interface

*/
static const char rcs_id[]="$Id$";

#include "config.h"
#include "mem.h"

#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <process.h>

#define MAX_ARGS	128

static void CopyArgs(char *argv[],char *new[])
{
    char *na;
    char *p;
    int len;
    int f;

    len=0;
    f=0;
    while(argv[f])
    	len+=strlen(argv[f++])+1;

    len++;

    na=Grab(len);

    f=0;
    while(argv[f])
	{
    	strcat(na,argv[f++]);
	strcat(na," ");
	}

    f=0;
    p=strtok(na," \t");

    while((f<MAX_ARGS-1)&&(p))
    	{
	new[f++]=Strdup(p);
	p=strtok(NULL," \t");
	}

    new[f]=NULL;

    Release(na);
}


static void Write(int fd, char *p)
{
    write(fd,p,strlen(p));
}


int RunCommand(char *argv[], char *path)
{
    static int old_stdout=-1;
    static int old_stderr=-1;
    int ret;
    int f;
    int fd;
    char *new[MAX_ARGS];

    if (old_stdout==-1)
	if ((old_stdout=dup(STDOUT_FILENO))==-1)
	    return(FALSE);

    if (old_stderr==-1)
	if ((old_stderr=dup(STDERR_FILENO))==-1)
	    return(FALSE);

    tmpnam(path);

    if ((fd=open(path,O_WRONLY|O_CREAT|O_TRUNC,0666))==-1)
	return(FALSE);

    CopyArgs(argv,new);

    if (!new[0])
	{
	close(fd);
    	return(FALSE);
	}

    dup2(fd,STDOUT_FILENO);
    dup2(fd,STDERR_FILENO);

    ret=spawnvp(P_WAIT,new[0],new);

    f=0;
    while(new[f])
    	Release(new[f++]);

    if (ret==-1)
	{
	Write(fd,"Exec failed:\n");
	Write(fd,sys_errlist[errno]);
	Write(fd,"\n");
	}

    dup2(old_stdout,STDOUT_FILENO);
    dup2(old_stderr,STDERR_FILENO);
    close(fd);

    if (ret==-1)
	return(FALSE);

    /* Assume that non-zero is error
    */
    return(ret==0);
}


/* END OF FILE */