LXR toybox/toys/other/readlink.c

   1/* readlink.c - Return string representation of a symbolic link.
   2 *
   3 * Copyright 2007 Rob Landley <rob@landley.net>
   4
   5// -ef positions match ABS_FILE ABS_PATH
   6USE_READLINK(NEWTOY(readlink, "<1nqmef(canonicalize)[-mef]", TOYFLAG_USR|TOYFLAG_BIN))
   7USE_REALPATH(OLDTOY(realpath, readlink, TOYFLAG_USR|TOYFLAG_BIN))
   8
   9config READLINK
  10  bool "readlink"
  11  default y
  12  help
  13    usage: readlink FILE...
  14
  15    With no options, show what symlink points to, return error if not symlink.
  16
  17    Options for producing canonical paths (all symlinks/./.. resolved):
  18
  19    -e  Canonical path to existing entry (fail if missing)
  20    -f  Full path (fail if directory missing)
  21    -m  Ignore missing entries, show where it would be
  22    -n  No trailing newline
  23    -q  Quiet (no output, just error code)
  24
  25config REALPATH
  26  bool "realpath"
  27  default y
  28  help
  29    usage: realpath FILE...
  30
  31    Display the canonical absolute pathname
  32*/
  33
  34#define FOR_readlink
  35#define FORCE_FLAGS
  36#include "toys.h"
  37
  38void readlink_main(void)
  39{
  40  char **arg, *s;
  41
  42  if (toys.which->name[3]=='l') toys.optflags |= FLAG_f;
  43  for (arg = toys.optargs; *arg; arg++) {
  44    // Calculating full canonical path?
  45    // Take advantage of flag positions: m = 0, f = ABS_PATH, e = ABS_FILE
  46    if (toys.optflags & (FLAG_f|FLAG_e|FLAG_m))
  47      s = xabspath(*arg, toys.optflags&(FLAG_f|FLAG_e));
  48    else s = xreadlink(*arg);
  49
  50    if (s) {
  51      if (!FLAG(q)) xprintf("%s%s", s, (FLAG(n) && !arg[1]) ? "" : "\n");
  52      free(s);
  53    } else toys.exitval = 1;
  54  }
  55}
  56