src/yes.c

   1 /* yes - output a string repeatedly until killed
   2    Copyright (C) 1991-1997, 1999-2004, 2007 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 "David MacKenzie"
  33
  34 /* The name this program was run with. */
  35 char *program_name;
  36
  37 void
  38 usage (int status)
  39 {
  40   if (status != EXIT_SUCCESS)
  41     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  42              program_name);
  43   else
  44     {
  45       printf (_("\
  46 Usage: %s [STRING]...\n\
  47   or:  %s OPTION\n\
  48 "),
  49               program_name, program_name);
  50
  51       fputs (_("\
  52 Repeatedly output a line with all specified STRING(s), or `y'.\n\
  53 \n\
  54 "), stdout);
  55       fputs (HELP_OPTION_DESCRIPTION, stdout);
  56       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  57       emit_bug_reporting_address ();
  58     }
  59   exit (status);
  60 }
  61
  62 int
  63 main (int argc, char **argv)
  64 {
  65   initialize_main (&argc, &argv);
  66   program_name = argv[0];
  67   setlocale (LC_ALL, "");
  68   bindtextdomain (PACKAGE, LOCALEDIR);
  69   textdomain (PACKAGE);
  70
  71   atexit (close_stdout);
  72
  73   parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
  74                       usage, AUTHORS, (char const *) NULL);
  75   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
  76     usage (EXIT_FAILURE);
  77
  78   if (argc <= optind)
  79     {
  80       optind = argc;
  81       argv[argc++] = "y";
  82     }
  83
  84   for (;;)
  85     {
  86       int i;
  87       for (i = optind; i < argc; i++)
  88         if (fputs (argv[i], stdout) == EOF
  89             || putchar (i == argc - 1 ? '\n' : ' ') == EOF)
  90           {
  91             error (0, errno, _("standard output"));
  92             exit (EXIT_FAILURE);
  93           }
  94     }
  95 }