coreutils/realpath.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
   4  *
   5  * Now does proper error checking on output and returns a failure exit code
   6  * if one or more paths cannot be resolved.
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10 //config:config REALPATH
  11 //config:       bool "realpath (2.5 kb)"
  12 //config:       default y
  13 //config:       help
  14 //config:       Return the canonicalized absolute pathname.
  15 //config:       This isn't provided by GNU shellutils, but where else does it belong.
  16
  17 //applet:IF_REALPATH(APPLET_NOFORK(realpath, realpath, BB_DIR_USR_BIN, BB_SUID_DROP, realpath))
  18
  19 //kbuild:lib-$(CONFIG_REALPATH) += realpath.o
  20
  21 /* BB_AUDIT SUSv3 N/A -- Apparently a busybox extension. */
  22
  23 //usage:#define realpath_trivial_usage
  24 //usage:       "FILE..."
  25 //usage:#define realpath_full_usage "\n\n"
  26 //usage:       "Print absolute pathnames of FILEs"
  27
  28 #include "libbb.h"
  29
  30 int realpath_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  31 int realpath_main(int argc UNUSED_PARAM, char **argv)
  32 {
  33         int retval = EXIT_SUCCESS;
  34
  35         if (!*++argv) {
  36                 bb_show_usage();
  37         }
  38
  39         do {
  40                 /* NOFORK: only one alloc is allowed; must free */
  41                 char *resolved_path = xmalloc_realpath_coreutils(*argv);
  42                 if (resolved_path != NULL) {
  43                         puts(resolved_path);
  44                         free(resolved_path);
  45                 } else {
  46                         retval = EXIT_FAILURE;
  47                         bb_simple_perror_msg(*argv);
  48                 }
  49         } while (*++argv);
  50
  51         fflush_stdout_and_exit(retval);
  52 }