src/basename.c

   1 /* basename -- strip directory and suffix from filenames
   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 /* Usage: basename name [suffix]
  19    NAME is a pathname; SUFFIX is a suffix to strip from it.
  20
  21    basename /usr/foo/lossage/functions.l
  22    => functions.l
  23    basename /usr/foo/lossage/functions.l .l
  24    => functions
  25    basename functions.lisp p
  26    => functions.lis */
  27
  28 #include <config.h>
  29 #include <stdio.h>
  30 #include <sys/types.h>
  31
  32 #include "system.h"
  33 #include "long-options.h"
  34 #include "error.h"
  35
  36 /* The official name of this program (e.g., no `g' prefix).  */
  37 #define PROGRAM_NAME "basename"
  38
  39 #define AUTHORS "FIXME unknown"
  40
  41 char *base_name ();
  42 void strip_trailing_slashes ();
  43
  44 /* The name this program was run with. */
  45 char *program_name;
  46
  47 void
  48 usage (int status)
  49 {
  50   if (status != 0)
  51     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  52              program_name);
  53   else
  54     {
  55       printf (_("\
  56 Usage: %s NAME [SUFFIX]\n\
  57   or:  %s OPTION\n\
  58 "),
  59               program_name, program_name);
  60       printf (_("\
  61 Print NAME with any leading directory components removed.\n\
  62 If specified, also remove a trailing SUFFIX.\n\
  63 \n\
  64   --help      display this help and exit\n\
  65   --version   output version information and exit\n\
  66 "));
  67       puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
  68     }
  69   exit (status);
  70 }
  71
  72 /* Remove SUFFIX from the end of NAME if it is there, unless NAME
  73    consists entirely of SUFFIX. */
  74
  75 static void
  76 remove_suffix (char *name, const char *suffix)
  77 {
  78   char *np;
  79   const char *sp;
  80
  81   np = name + strlen (name);
  82   sp = suffix + strlen (suffix);
  83
  84   while (np > name && sp > suffix)
  85     if (*--np != *--sp)
  86       return;
  87   if (np > name)
  88     *np = '\0';
  89 }
  90
  91 int
  92 main (int argc, char **argv)
  93 {
  94   char *name;
  95
  96   program_name = argv[0];
  97   setlocale (LC_ALL, "");
  98   bindtextdomain (PACKAGE, LOCALEDIR);
  99   textdomain (PACKAGE);
 100
 101   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
 102                       AUTHORS, usage);
 103   /* The above handles --help and --version.
 104      Since there is no other invocation of getopt, handle `--' here.  */
 105   if (argc > 1 && STREQ (argv[1], "--"))
 106     {
 107       --argc;
 108       ++argv;
 109     }
 110
 111   if (argc == 1 || argc > 3)
 112     {
 113       error (0, 0, (argc == 1 ? _("too few arguments")
 114                     : _("too many arguments")));
 115       usage (1);
 116     }
 117
 118   strip_trailing_slashes (argv[1]);
 119
 120   name = base_name (argv[1]);
 121
 122   if (argc == 3)
 123     remove_suffix (name, argv[2]);
 124
 125   puts (name);
 126
 127   exit (0);
 128 }