src/yes.c

   1 /* yes - output a string repeatedly until killed
   2    Copyright (C) 1991-1997, 1999, 2000, 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "error.h"
  26 #include "system.h"
  27 #include "long-options.h"
  28 #include "closeout.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 /* How many iterations between ferror checks.  */
  36 #define UNROLL 10000
  37
  38 /* The name this program was run with. */
  39 char *program_name;
  40
  41 void
  42 usage (int status)
  43 {
  44   if (status != 0)
  45     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  46              program_name);
  47   else
  48     {
  49       printf (_("\
  50 Usage: %s [STRING]...\n\
  51   or:  %s OPTION\n\
  52 "),
  53               program_name, program_name);
  54
  55       fputs (_("\
  56 Repeatedly output a line with all specified STRING(s), or `y'.\n\
  57 \n\
  58 "), stdout);
  59       fputs (HELP_OPTION_DESCRIPTION, stdout);
  60       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  61       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  62     }
  63   exit (status);
  64 }
  65
  66 int
  67 main (int argc, char **argv)
  68 {
  69   program_name = argv[0];
  70   setlocale (LC_ALL, "");
  71   bindtextdomain (PACKAGE, LOCALEDIR);
  72   textdomain (PACKAGE);
  73
  74   atexit (close_stdout);
  75
  76   /* Don't recognize --help or --version if POSIXLY_CORRECT is set.  */
  77   if (getenv ("POSIXLY_CORRECT") == NULL)
  78     parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  79                         AUTHORS, usage);
  80
  81   if (argc == 1)
  82     {
  83       while (1)
  84         {
  85           int i;
  86           for (i = 0; i < UNROLL; i++)
  87             puts ("y");
  88           if (ferror (stdout))
  89             break;
  90         }
  91     }
  92   else
  93     {
  94       while (1)
  95         {
  96           int i;
  97           for (i = 0; i < UNROLL; i++)
  98             {
  99               int j;
 100               for (j = 1; j < argc; j++)
 101                 {
 102                   fputs (argv[j], stdout);
 103                   putchar (j == argc - 1 ? '\n' : ' ');
 104                 }
 105             }
 106           if (ferror (stdout))
 107             break;
 108         }
 109     }
 110
 111   error (0, errno, "standard output");
 112   exit (EXIT_FAILURE);
 113 }