#include<sys/types.h>
#include<sys/wait.h>
#include"apue.h"

int
main(void)
{
  char buf[MAXLINE];
  pid_t pid;
  int status;
  char *p;
  char *argv[MAXLINE];
  int i=0;

  printf("%% ");
  while(fgets(buf,MAXLINE,stdin)!=NULL)
  {
    buf[strlen(buf)-1]='\0';
    if((pid=fork())<0)
      err_sys("fork error");

    else if(pid==0)
    {  
      argv[i++]=buf;
      for(p=buf;*p!='\0';p++)
      {
         if(*p==' ')
         {
           *p='\0';
           argv[i++]=++p;
         }
      }
      execve(argv[0],argv,NULL);
      err_ret("couldn't execute: %s",buf);
      exit(127);
    }
    if((pid=waitpid(pid,&status,0))<0)
      err_sys("waitpid error");
    printf("%% ");
  }
  exit(0);
}