src/link.c

   1 /* link utility for GNU.
   2    Copyright (C) 2001-2024 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 3 of the License, or
   7    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Michael Stone */
  18
  19 /* Implementation overview:
  20
  21    Simply call the system 'link' function */
  22
  23 #include <config.h>
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26
  27 #include "system.h"
  28 #include "long-options.h"
  29 #include "quote.h"
  30
  31 /* The official name of this program (e.g., no 'g' prefix).  */
  32 #define PROGRAM_NAME "link"
  33
  34 #define AUTHORS proper_name ("Michael Stone")
  35
  36 void
  37 usage (int status)
  38 {
  39   if (status != EXIT_SUCCESS)
  40     emit_try_help ();
  41   else
  42     {
  43       printf (_("\
  44 Usage: %s FILE1 FILE2\n\
  45   or:  %s OPTION\n"), program_name, program_name);
  46       fputs (_("Call the link function to create a link named FILE2\
  47  to an existing FILE1.\n\n"),
  48              stdout);
  49       fputs (HELP_OPTION_DESCRIPTION, stdout);
  50       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  51       emit_ancillary_info (PROGRAM_NAME);
  52     }
  53   exit (status);
  54 }
  55
  56 int
  57 main (int argc, char **argv)
  58 {
  59   initialize_main (&argc, &argv);
  60   set_program_name (argv[0]);
  61   setlocale (LC_ALL, "");
  62   bindtextdomain (PACKAGE, LOCALEDIR);
  63   textdomain (PACKAGE);
  64
  65   atexit (close_stdout);
  66
  67   parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
  68                                    Version, true, usage, AUTHORS,
  69                                    (char const *) nullptr);
  70
  71   if (argc < optind + 2)
  72     {
  73       if (argc < optind + 1)
  74         error (0, 0, _("missing operand"));
  75       else
  76         error (0, 0, _("missing operand after %s"), quote (argv[optind]));
  77       usage (EXIT_FAILURE);
  78     }
  79
  80   if (optind + 2 < argc)
  81     {
  82       error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
  83       usage (EXIT_FAILURE);
  84     }
  85
  86   if (link (argv[optind], argv[optind + 1]) != 0)
  87     error (EXIT_FAILURE, errno, _("cannot create link %s to %s"),
  88            quoteaf_n (0, argv[optind + 1]), quoteaf_n (1, argv[optind]));
  89
  90   return EXIT_SUCCESS;
  91 }