src/link.c

   1 /* link utility for GNU.
   2    Copyright (C) 2001-2023 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 "die.h"
  29 #include "error.h"
  30 #include "long-options.h"
  31 #include "quote.h"
  32
  33 /* The official name of this program (e.g., no 'g' prefix).  */
  34 #define PROGRAM_NAME "link"
  35
  36 #define AUTHORS proper_name ("Michael Stone")
  37
  38 void
  39 usage (int status)
  40 {
  41   if (status != EXIT_SUCCESS)
  42     emit_try_help ();
  43   else
  44     {
  45       printf (_("\
  46 Usage: %s FILE1 FILE2\n\
  47   or:  %s OPTION\n"), program_name, program_name);
  48       fputs (_("Call the link function to create a link named FILE2\
  49  to an existing FILE1.\n\n"),
  50              stdout);
  51       fputs (HELP_OPTION_DESCRIPTION, stdout);
  52       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  53       emit_ancillary_info (PROGRAM_NAME);
  54     }
  55   exit (status);
  56 }
  57
  58 int
  59 main (int argc, char **argv)
  60 {
  61   initialize_main (&argc, &argv);
  62   set_program_name (argv[0]);
  63   setlocale (LC_ALL, "");
  64   bindtextdomain (PACKAGE, LOCALEDIR);
  65   textdomain (PACKAGE);
  66
  67   atexit (close_stdout);
  68
  69   parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
  70                                    Version, true, usage, AUTHORS,
  71                                    (char const *) NULL);
  72
  73   if (argc < optind + 2)
  74     {
  75       if (argc < optind + 1)
  76         error (0, 0, _("missing operand"));
  77       else
  78         error (0, 0, _("missing operand after %s"), quote (argv[optind]));
  79       usage (EXIT_FAILURE);
  80     }
  81
  82   if (optind + 2 < argc)
  83     {
  84       error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
  85       usage (EXIT_FAILURE);
  86     }
  87
  88   if (link (argv[optind], argv[optind + 1]) != 0)
  89     die (EXIT_FAILURE, errno, _("cannot create link %s to %s"),
  90          quoteaf_n (0, argv[optind + 1]), quoteaf_n (1, argv[optind]));
  91
  92   return EXIT_SUCCESS;
  93 }