rem: if (readfd(f,b,4) != 4) {
add: if ((ret=readfd(f,b,4)) != 4) {
context: int read_int(int f){  char b[4];  if (readfd(f,b,4) != 4) {    if (verbose > 1)       fprintf(stderr,"Error reading %d bytes : %s\n",4,strerror(errno));    exit(1);  }  total_read += 4;  return IVAL(b,0);}