/*            aoub.c                 */
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
int main(int argc, char **argv){
  if( argc != 3 ){
    fprintf( stderr, "usage : %s mot_a mot_b\n", argv[1]);
    exit(1);
  }
  int terminal = open("/dev/tty", O_WRONLY);
  char c;
  while( read( 0, &c, sizeof(c) ) > 0 ){
    if ( c == 'a' )
      write( terminal , argv[1] , strlen(argv[1]) );
    else if( c == 'b' )
      write( terminal , argv[2] , strlen(argv[2]) );
    else
      continue;
    char n = '\n';
    write(terminal, &n , sizeof(n) );
    write( 1 , &c, sizeof( c ) ) ;
  }
}