summaryrefslogtreecommitdiffstats
path: root/src/yes.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:11:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:11:47 +0000
commit758f820bcc0f68aeebac1717e537ca13a320b909 (patch)
tree48111ece75cf4f98316848b37a7e26356e00669e /src/yes.c
parentInitial commit. (diff)
downloadcoreutils-758f820bcc0f68aeebac1717e537ca13a320b909.tar.xz
coreutils-758f820bcc0f68aeebac1717e537ca13a320b909.zip
Adding upstream version 9.1.upstream/9.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/yes.c')
-rw-r--r--src/yes.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/src/yes.c b/src/yes.c
new file mode 100644
index 0000000..13b990e
--- /dev/null
+++ b/src/yes.c
@@ -0,0 +1,130 @@
+/* yes - output a string repeatedly until killed
+ Copyright (C) 1991-2022 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 <https://www.gnu.org/licenses/>. */
+
+/* David MacKenzie <djm@gnu.ai.mit.edu> */
+
+#include <config.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "system.h"
+
+#include "error.h"
+#include "full-write.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)
+{
+ initialize_main (&argc, &argv);
+ set_program_name (argv[0]);
+ setlocale (LC_ALL, "");
+ bindtextdomain (PACKAGE, LOCALEDIR);
+ textdomain (PACKAGE);
+
+ atexit (close_stdout);
+
+ parse_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
+ Version, true, usage, AUTHORS,
+ (char const *) NULL);
+
+ char **operands = argv + optind;
+ 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. */
+ size_t bufalloc = 0;
+ bool reuse_operand_strings = true;
+ char **operandp = operands;
+ do
+ {
+ size_t operand_len = strlen (*operandp);
+ bufalloc += operand_len + 1;
+ if (operandp + 1 < operand_lim
+ && *operandp + operand_len + 1 != operandp[1])
+ reuse_operand_strings = false;
+ }
+ while (++operandp < operand_lim);
+
+ /* Improve performance by using a buffer size greater than BUFSIZ / 2. */
+ if (bufalloc <= BUFSIZ / 2)
+ {
+ bufalloc = BUFSIZ;
+ reuse_operand_strings = false;
+ }
+
+ /* Fill the buffer with one copy of the output. If possible, reuse
+ the operands strings; this wins when the buffer would be large. */
+ char *buf = reuse_operand_strings ? *operands : xmalloc (bufalloc);
+ size_t bufused = 0;
+ operandp = operands;
+ do
+ {
+ size_t operand_len = strlen (*operandp);
+ if (! reuse_operand_strings)
+ memcpy (buf + bufused, *operandp, operand_len);
+ bufused += operand_len;
+ buf[bufused++] = ' ';
+ }
+ while (++operandp < operand_lim);
+ buf[bufused - 1] = '\n';
+
+ /* If a larger buffer was allocated, fill it by repeating the buffer
+ contents. */
+ size_t copysize = bufused;
+ for (size_t copies = bufalloc / copysize; --copies; )
+ {
+ memcpy (buf + bufused, buf, copysize);
+ bufused += copysize;
+ }
+
+ /* Repeatedly output the buffer until there is a write error; then fail. */
+ while (full_write (STDOUT_FILENO, buf, bufused) == bufused)
+ continue;
+ error (0, errno, _("standard output"));
+ main_exit (EXIT_FAILURE);
+}