/* untarzip.c - unzipping and untarring a file. It is invoked
   	        with exactly one parameter of the form name.tar.Z
                It has the same effect as the command
		  uncompress filename | tar -xfv -
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
int main(int argc, char *argv[]) 
{
  int p[2];  /* pipe established between parent and child */
  pid_t id;  /* value returned by fork operation */
  
  if (argc != 2) {
    printf("Usage: %s filename\n", argv[0]);
    exit(0);
  }

  if (pipe(p) < 0) {
    perror("Unable to create pipe");
    exit(0);
  }
  if ((id = fork()) > 0) { /* parent */
    close(1);
    dup(p[1]);
    close(p[0]);
    execlp ("uncompress", "uncompress", "-c", argv[1], NULL);
  } else if (id == 0) { /* child */
    close(0);
    dup(p[0]);
    close(p[1]);
    execlp("tar", "tar", "-xf", "-", NULL);
  } else { /* error case */
    perror("Unable to fork");
    exit(0);
  }
  return 0;
}