src/dirname.c

   1 /* dirname -- strip filename suffix from pathname
   2    Copyright (C) 1990-1997, 1999 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by David MacKenzie and Jim Meyering. */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23
  24 #include "system.h"
  25 #include "long-options.h"
  26 #include "error.h"
  27
  28 /* The official name of this program (e.g., no `g' prefix).  */
  29 #define PROGRAM_NAME "dirname"
  30
  31 #define AUTHORS "David MacKenzie and Jim Meyering"
  32
  33 void strip_trailing_slashes ();
  34
  35 /* The name this program was run with. */
  36 char *program_name;
  37
  38 void
  39 usage (int status)
  40 {
  41   if (status != 0)
  42     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  43              program_name);
  44   else
  45     {
  46       printf (_("\
  47 Usage: %s NAME\n\
  48   or:  %s OPTION\n\
  49 "),
  50               program_name, program_name);
  51       printf (_("\
  52 Print NAME with its trailing /component removed; if NAME contains no /'s,\n\
  53 output `.' (meaning the current directory).\n\
  54 \n\
  55   --help      display this help and exit\n\
  56   --version   output version information and exit\n\
  57 "));
  58       puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
  59     }
  60   exit (status);
  61 }
  62
  63 int
  64 main (int argc, char **argv)
  65 {
  66   register char *path;
  67   register char *slash;
  68
  69   program_name = argv[0];
  70   setlocale (LC_ALL, "");
  71   bindtextdomain (PACKAGE, LOCALEDIR);
  72   textdomain (PACKAGE);
  73
  74   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  75                       AUTHORS, usage);
  76   /* The above handles --help and --version.
  77      Since there is no other invocation of getopt, handle `--' here.  */
  78   if (argc > 1 && STREQ (argv[1], "--"))
  79     {
  80       --argc;
  81       ++argv;
  82     }
  83
  84   if (argc != 2)
  85     {
  86       error (0, 0, argc < 2 ? _("too few arguments")
  87              : _("too many arguments"));
  88       usage (1);
  89     }
  90
  91   path = argv[1];
  92   strip_trailing_slashes (path);
  93
  94   slash = strrchr (path, '/');
  95   if (slash == NULL)
  96     path = (char *) ".";
  97   else
  98     {
  99       /* Remove any trailing slashes and final element. */
 100       while (slash > path && *slash == '/')
 101         --slash;
 102       slash[1] = 0;
 103     }
 104   puts (path);
 105
 106   exit (0);
 107 }