rem: if (readfd(f,buf,len) != len) {
add: int ret; if ((ret=readfd(f,buf,len)) != len) {
context: void read_buf(int f,char *buf,int len){  if (readfd(f,buf,len) != len) {    if (verbose > 1)       fprintf(stderr,"Error reading %d bytes : %s\n",len,strerror(errno));    exit(1);  }  total_read += len;}