view toys/posix/cat.c @ 1333:fc1bb49e58a9 draft

Help text should have a blank line after usage: lines, and a couple other whitespace tweaks.
author Rob Landley <>
date Mon, 02 Jun 2014 21:16:20 -0500
parents 6cc69be43c42
children f67b1e9e91b4
line wrap: on
line source

/* cat.c - copy inputs to stdout.
 * Copyright 2006 Rob Landley <>
 * See


config CAT
  bool "cat"
  default y
    usage: cat [-u] [file...]

    Copy (concatenate) files to stdout.  If no files listed, copy from stdin.
    Filename "-" is a synonym for stdin.

    -u	Copy one byte at a time (slow).

#include "toys.h"

static void do_cat(int fd, char *name)
  int len, size=toys.optflags ? 1 : sizeof(toybuf);

  for (;;) {
    len = read(fd, toybuf, size);
    if (len<0) perror_msg("%s",name);
    if (len<1) break;
    xwrite(1, toybuf, len);

void cat_main(void)
  loopfiles(toys.optargs, do_cat);