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/* yes - output a string repeatedly until killed
Copyright (C) 1991-2016 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* David MacKenzie <djm@gnu.ai.mit.edu> */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <getopt.h>
#include "system.h"
#include "error.h"
#include "long-options.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "yes"
#define AUTHORS proper_name ("David MacKenzie")
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s [STRING]...\n\
or: %s OPTION\n\
"),
program_name, program_name);
fputs (_("\
Repeatedly output a line with all specified STRING(s), or 'y'.\n\
\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
char buf[BUFSIZ];
char *pbuf = buf;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
usage, AUTHORS, (char const *) NULL);
if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
usage (EXIT_FAILURE);
char **operand_lim = argv + argc;
if (optind == argc)
*operand_lim++ = bad_cast ("y");
/* Buffer data locally once, rather than having the
large overhead of stdio buffering each item. */
char **operandp;
for (operandp = argv + optind; operandp < operand_lim; operandp++)
{
size_t len = strlen (*operandp);
if (BUFSIZ < len || BUFSIZ - len <= pbuf - buf)
break;
memcpy (pbuf, *operandp, len);
pbuf += len;
*pbuf++ = operandp + 1 == operand_lim ? '\n' : ' ';
}
/* The normal case is to continuously output the local buffer. */
if (operandp == operand_lim)
{
size_t line_len = pbuf - buf;
size_t lines = BUFSIZ / line_len;
while (--lines)
{
memcpy (pbuf, pbuf - line_len, line_len);
pbuf += line_len;
}
while (0 <= write (STDOUT_FILENO, buf, pbuf - buf))
continue;
error (0, errno, _("standard output"));
return EXIT_FAILURE;
}
/* If the data doesn't fit in BUFSIZ then output
what we've buffered, and iterate over the remaining items. */
while (true)
{
if ((pbuf - buf) && fwrite (buf, pbuf - buf, 1, stdout) != 1)
{
error (0, errno, _("standard output"));
clearerr (stdout);
return EXIT_FAILURE;
}
for (char **trailing = operandp; trailing < operand_lim; trailing++)
if (fputs (*trailing, stdout) == EOF
|| putchar (trailing + 1 == operand_lim ? '\n' : ' ') == EOF)
{
error (0, errno, _("standard output"));
clearerr (stdout);
return EXIT_FAILURE;
}
}
}
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