src/yes.c

   1 /* yes - output a string repeatedly until killed
   2    Copyright (C) 1991-1997, 1999-2004, 2007-2011 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 <http://www.gnu.org/licenses/>.  */
  16
  17 /* David MacKenzie <djm@gnu.ai.mit.edu> */
  18
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <sys/types.h>
  22 #include <getopt.h>
  23
  24 #include "system.h"
  25
  26 #include "error.h"
  27 #include "long-options.h"
  28
  29 /* The official name of this program (e.g., no `g' prefix).  */
  30 #define PROGRAM_NAME "yes"
  31
  32 #define AUTHORS proper_name ("David MacKenzie")
  33
  34 void
  35 usage (int status)
  36 {
  37   if (status != EXIT_SUCCESS)
  38     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  39              program_name);
  40   else
  41     {
  42       printf (_("\
  43 Usage: %s [STRING]...\n\
  44   or:  %s OPTION\n\
  45 "),
  46               program_name, program_name);
  47
  48       fputs (_("\
  49 Repeatedly output a line with all specified STRING(s), or `y'.\n\
  50 \n\
  51 "), stdout);
  52       fputs (HELP_OPTION_DESCRIPTION, stdout);
  53       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  54       emit_ancillary_info ();
  55     }
  56   exit (status);
  57 }
  58
  59 int
  60 main (int argc, char **argv)
  61 {
  62   initialize_main (&argc, &argv);
  63   set_program_name (argv[0]);
  64   setlocale (LC_ALL, "");
  65   bindtextdomain (PACKAGE, LOCALEDIR);
  66   textdomain (PACKAGE);
  67
  68   atexit (close_stdout);
  69
  70   parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
  71                       usage, AUTHORS, (char const *) NULL);
  72   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
  73     usage (EXIT_FAILURE);
  74
  75   if (argc <= optind)
  76     {
  77       optind = argc;
  78       argv[argc++] = bad_cast ("y");
  79     }
  80
  81   while (true)
  82     {
  83       int i;
  84       for (i = optind; i < argc; i++)
  85         if (fputs (argv[i], stdout) == EOF
  86             || putchar (i == argc - 1 ? '\n' : ' ') == EOF)
  87           error (EXIT_FAILURE, errno, _("standard output"));
  88     }
  89 }