view toys/other/readlink.c @ 1775:57f2a26fa92c draft toast

To ensure that toybox can be installed alongside busybox without confusing update-alternatives, the paths of the links installed by toybox should match those installed by busybox. This is accomplished by changing the flags of a few tools within toybox.
author Paul Barker <>
date Sat, 04 Apr 2015 11:58:06 -0500
parents 0027cfa330da
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/* readlink.c - Return string representation of a symbolic link.
 * Copyright 2007 Rob Landley <>


  bool "readlink"
  default y
    usage: readlink FILE

    With no options, show what symlink points to, return error if not symlink.

    Options for producing cannonical paths (all symlinks/./.. resolved):

    -e	cannonical path to existing entry (fail if missing)
    -f	full path (fail if directory missing)
    -n	no trailing newline
    -q	quiet (no output, just error code)

#define FOR_readlink
#include "toys.h"

void readlink_main(void)
  char *s;

  // Calculating full cannonical path?

  if (toys.optflags & (FLAG_f|FLAG_e))
    s = xabspath(*toys.optargs, toys.optflags & FLAG_e);
  else s = xreadlink(*toys.optargs);

  if (s) {
    if (!(toys.optflags & FLAG_q))
      xprintf((toys.optflags & FLAG_n) ? "%s" : "%s\n", s);
    if (CFG_TOYBOX_FREE) free(s);
  } else toys.exitval = 1;