#include <stdio.h> /* fprintf(3), stderr */
#include <sysexits.h> /* EX_USAGE */
#include <unistd.h> /* execvp(3) */
#include <sys/types.h> /* <sys/wait.h> */
#include <sys/wait.h> /* wait(2) */

#include "psargs.h"

static char *program_name = "pscat";

#define L_PAREN '['
#define R_PAREN ']'

int
forking(char **argv){
	int child;
	char **corr;

	corr = corresponding_arg(argv, L_PAREN, R_PAREN);
	*corr = NULL;
	if(fork() == 0){
		execvp(argv[1], argv+1);
	}else{
		wait(&child);
		argv = corr;
		if(*++argv == NULL)
			return WIFEXITED(child) * WEXITSTATUS(child);
		else
			return forking(argv);
	}
}

int main(int argc, char *argv[]){

	if(check_arg(++argv, L_PAREN, R_PAREN) == 0){
		fprintf(stderr,
			"Usage: %s \"[\" [utility [argument...]] \"]\" ...\n",
			argv[-1] == NULL ? program_name : argv[-1]
		);
		return EX_USAGE;
	}else
		return forking(argv);
}