coreutils/yes.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * yes implementation for busybox
   4  *
   5  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  10  *
  11  * Size reductions and removed redundant applet name prefix from error messages.
  12  */
  13 //config:config YES
  14 //config:       bool "yes (1.5 kb)"
  15 //config:       default y
  16 //config:       help
  17 //config:       yes is used to repeatedly output a specific string, or
  18 //config:       the default string 'y'.
  19
  20 //applet:IF_YES(APPLET_NOEXEC(yes, yes, BB_DIR_USR_BIN, BB_SUID_DROP, yes))
  21 /* was NOFORK, but then yes can't be ^C'ed if run by hush */
  22
  23 //kbuild:lib-$(CONFIG_YES) += yes.o
  24
  25 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
  26
  27 //usage:#define yes_trivial_usage
  28 //usage:       "[STRING]"
  29 //usage:#define yes_full_usage "\n\n"
  30 //usage:       "Repeatedly print a line with STRING, or 'y'"
  31
  32 #include "libbb.h"
  33
  34 int yes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  35 int yes_main(int argc UNUSED_PARAM, char **argv)
  36 {
  37         char **pp;
  38
  39         argv[0] = (char*)"y";
  40         if (argv[1])
  41                 ++argv;
  42
  43         do {
  44                 pp = argv;
  45                 while (1) {
  46                         fputs_stdout(*pp);
  47                         if (!*++pp)
  48                                 break;
  49                         putchar(' ');
  50                 }
  51         } while (putchar('\n') != EOF);
  52
  53         bb_perror_nomsg_and_die();
  54 }