src/link.c

   1 /* link utility for GNU.
   2    Copyright (C) 2001-2019 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 <getopt.h>
  26 #include <sys/types.h>
  27
  28 #include "system.h"
  29 #include "die.h"
  30 #include "error.h"
  31 #include "long-options.h"
  32 #include "quote.h"
  33
  34 /* The official name of this program (e.g., no 'g' prefix).  */
  35 #define PROGRAM_NAME "link"
  36
  37 #define AUTHORS proper_name ("Michael Stone")
  38
  39 static struct option const long_options[] =
  40 {
  41   {NULL, 0, NULL, 0}
  42 };
  43
  44 void
  45 usage (int status)
  46 {
  47   if (status != EXIT_SUCCESS)
  48     emit_try_help ();
  49   else
  50     {
  51       printf (_("\
  52 Usage: %s FILE1 FILE2\n\
  53   or:  %s OPTION\n"), program_name, program_name);
  54       fputs (_("Call the link function to create a link named FILE2\
  55  to an existing FILE1.\n\n"),
  56              stdout);
  57       fputs (HELP_OPTION_DESCRIPTION, stdout);
  58       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  59       emit_ancillary_info (PROGRAM_NAME);
  60     }
  61   exit (status);
  62 }
  63
  64 int
  65 main (int argc, char **argv)
  66 {
  67   initialize_main (&argc, &argv);
  68   set_program_name (argv[0]);
  69   setlocale (LC_ALL, "");
  70   bindtextdomain (PACKAGE, LOCALEDIR);
  71   textdomain (PACKAGE);
  72
  73   atexit (close_stdout);
  74
  75   parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
  76                       usage, AUTHORS, (char const *) NULL);
  77   if (getopt_long (argc, argv, "", long_options, NULL) != -1)
  78     usage (EXIT_FAILURE);
  79
  80   if (argc < optind + 2)
  81     {
  82       if (argc < optind + 1)
  83         error (0, 0, _("missing operand"));
  84       else
  85         error (0, 0, _("missing operand after %s"), quote (argv[optind]));
  86       usage (EXIT_FAILURE);
  87     }
  88
  89   if (optind + 2 < argc)
  90     {
  91       error (0, 0, _("extra operand %s"), quote (argv[optind + 2]));
  92       usage (EXIT_FAILURE);
  93     }
  94
  95   if (link (argv[optind], argv[optind + 1]) != 0)
  96     die (EXIT_FAILURE, errno, _("cannot create link %s to %s"),
  97          quoteaf_n (0, argv[optind + 1]), quoteaf_n (1, argv[optind]));
  98
  99   return EXIT_SUCCESS;
 100 }