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  1. /* yes - output a string repeatedly until killed
  2.    Copyright (C) 1991-2016 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://w...content-available-to-author-only...u.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 "full-write.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 proper_name ("David MacKenzie")
  34.  
  35.   void
  36. usage (int status)
  37. {
  38.   if (status != EXIT_SUCCESS)
  39.     emit_try_help ();
  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 (PROGRAM_NAME);
  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.   char **operands = argv + optind;
  76.   char **operand_lim = argv + argc;
  77.   if (optind == argc)
  78.     *operand_lim++ = bad_cast ("y");
  79.  
  80.   /* Buffer data locally once, rather than having the
  81.      large overhead of stdio buffering each item.  */
  82.   size_t bufalloc = 0;
  83.   bool reuse_operand_strings = true;
  84.   for (char **operandp = operands; operandp < operand_lim; operandp++)
  85.   {
  86.     size_t operand_len = strlen (*operandp);
  87.     bufalloc += operand_len + 1;
  88.     if (operandp + 1 < operand_lim
  89.         && *operandp + operand_len + 1 != operandp[1])
  90.       reuse_operand_strings = false;
  91.   }
  92.  
  93.   /* Improve performance by using a buffer size greater than BUFSIZ / 2.  */
  94.   if (bufalloc <= BUFSIZ / 2)
  95.   {
  96.     bufalloc = BUFSIZ;
  97.     reuse_operand_strings = false;
  98.   }
  99.  
  100.   /* Fill the buffer with one copy of the output.  If possible, reuse
  101.      the operands strings; this wins when the buffer would be large.  */
  102.   char *buf = reuse_operand_strings ? *operands : xmalloc (bufalloc);
  103.   size_t bufused = 0;
  104.   for (char **operandp = operands; operandp < operand_lim; operandp++)
  105.   {
  106.     size_t operand_len = strlen (*operandp);
  107.     if (! reuse_operand_strings)
  108.       memcpy (buf + bufused, *operandp, operand_len);
  109.     bufused += operand_len;
  110.     buf[bufused++] = ' ';
  111.   }
  112.   buf[bufused - 1] = '\n';
  113.  
  114.   /* If a larger buffer was allocated, fill it by repeating the buffer
  115.      contents.  */
  116.   size_t copysize = bufused;
  117.   for (size_t copies = bufalloc / copysize; --copies; )
  118.   {
  119.     memcpy (buf + bufused, buf, copysize);
  120.     bufused += copysize;
  121.   }
  122.  
  123.   /* Repeatedly output the buffer until there is a write error; then fail.  */
  124.   while (full_write (STDOUT_FILENO, buf, bufused) == bufused)
  125.     continue;
  126.   error (0, errno, _("standard output"));
  127.   return EXIT_FAILURE;
  128. }
  129.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c:19:10: fatal error: 'config.h' file not found
#include <config.h>
         ^~~~~~~~~~
1 error generated.
stdout
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Standard output is empty
https://ideone.com/iHXKS2
language:
C (clang 8.0)
created:
5 years ago
visibility:
public

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