src/yes.c

   1 /* yes - output a string repeatedly until killed
   2    Copyright (C) 1991-1997, 1999-2004 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 2, or (at your option)
   7    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, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 /* David MacKenzie <djm@gnu.ai.mit.edu> */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <getopt.h>
  24
  25 #include "system.h"
  26
  27 #include "error.h"
  28 #include "long-options.h"
  29
  30 /* The official name of this program (e.g., no `g' prefix).  */
  31 #define PROGRAM_NAME "yes"
  32
  33 #define AUTHORS "David MacKenzie"
  34
  35 /* The name this program was run with. */
  36 char *program_name;
  37
  38 void
  39 usage (int status)
  40 {
  41   if (status != EXIT_SUCCESS)
  42     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  43              program_name);
  44   else
  45     {
  46       printf (_("\
  47 Usage: %s [STRING]...\n\
  48   or:  %s OPTION\n\
  49 "),
  50               program_name, program_name);
  51
  52       fputs (_("\
  53 Repeatedly output a line with all specified STRING(s), or `y'.\n\
  54 \n\
  55 "), stdout);
  56       fputs (HELP_OPTION_DESCRIPTION, stdout);
  57       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  58       emit_bug_reporting_address ();
  59     }
  60   exit (status);
  61 }
  62
  63 int
  64 main (int argc, char **argv)
  65 {
  66   initialize_main (&argc, &argv);
  67   program_name = argv[0];
  68   setlocale (LC_ALL, "");
  69   bindtextdomain (PACKAGE, LOCALEDIR);
  70   textdomain (PACKAGE);
  71
  72   atexit (close_stdout);
  73
  74   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  75                       usage, AUTHORS, (char const *) NULL);
  76   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
  77     usage (EXIT_FAILURE);
  78
  79   if (argc <= optind)
  80     {
  81       optind = argc;
  82       argv[argc++] = "y";
  83     }
  84
  85   for (;;)
  86     {
  87       int i;
  88       for (i = optind; i < argc; i++)
  89         if (fputs (argv[i], stdout) == EOF
  90             || putchar (i == argc - 1 ? '\n' : ' ') == EOF)
  91           {
  92             error (0, errno, _("standard output"));
  93             exit (EXIT_FAILURE);
  94           }
  95     }
  96 }