box/coreutils/realpath.c

   1 /* vi: set sw=4 ts=4: */
   2
   3 /* BB_AUDIT SUSv3 N/A -- Apparently a busybox extension. */
   4
   5 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
   6  *
   7  * Now does proper error checking on output and returns a failure exit code
   8  * if one or more paths cannot be resolved.
   9  *
  10  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  11  */
  12
  13 #include "libbb.h"
  14
  15 int realpath_main(int argc, char **argv);
  16 int realpath_main(int argc, char **argv)
  17 {
  18         int retval = EXIT_SUCCESS;
  19
  20 #if PATH_MAX > (BUFSIZ+1)
  21         RESERVE_CONFIG_BUFFER(resolved_path, PATH_MAX);
  22 # define resolved_path_MUST_FREE 1
  23 #else
  24 #define resolved_path bb_common_bufsiz1
  25 # define resolved_path_MUST_FREE 0
  26 #endif
  27
  28         if (--argc == 0) {
  29                 bb_show_usage();
  30         }
  31
  32         do {
  33                 argv++;
  34                 if (realpath(*argv, resolved_path) != NULL) {
  35                         puts(resolved_path);
  36                 } else {
  37                         retval = EXIT_FAILURE;
  38                         bb_perror_msg("%s", *argv);
  39                 }
  40         } while (--argc);
  41
  42 #if ENABLE_FEATURE_CLEAN_UP && resolved_path_MUST_FREE
  43         RELEASE_CONFIG_BUFFER(resolved_path);
  44 #endif
  45
  46         fflush_stdout_and_exit(retval);
  47 }