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+/*-
+ * Copyright (c) 1987, 1992 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Modified for Linux by Charles Hannum (mycroft@gnu.ai.mit.edu)
+ * and Brian Koehmstedt (bpk@gnu.ai.mit.edu)
+ *
+ * Wed Sep 14 22:26:00 1994: Patch from bjdouma <bjdouma@xs4all.nl> to handle
+ * last line that has no newline correctly.
+ * 3-Jun-1998: Patched by Nicolai Langfeldt to work better on Linux:
+ * Handle any-length-lines. Code copied from util-linux' setpwnam.c
+ * 1999-02-22 Arkadiusz Miƛkiewicz <misiek@pld.ORG.PL>
+ * added Native Language Support
+ * 1999-09-19 Bruno Haible <haible@clisp.cons.org>
+ * modified to work correctly in multi-byte locales
+ * July 2010 - Davidlohr Bueso <dave@gnu.org>
+ * Fixed memory leaks (including Linux signal handling)
+ * Added some memory allocation error handling
+ * Lowered the default buffer size to 256, instead of 512 bytes
+ * Changed tab indentation to 8 chars for better reading the code
+ */
+
+#include <stdarg.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <getopt.h>
+
+#include "nls.h"
+#include "xalloc.h"
+#include "widechar.h"
+#include "c.h"
+#include "closestream.h"
+
+static void sig_handler(int signo __attribute__ ((__unused__)))
+{
+ _exit(EXIT_SUCCESS);
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fprintf(out, _("Usage: %s [options] [file ...]\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Reverse lines characterwise.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ printf(USAGE_HELP_OPTIONS(16));
+ printf(USAGE_MAN_TAIL("rev(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+static void reverse_str(wchar_t *str, size_t n)
+{
+ size_t i;
+
+ for (i = 0; i < n / 2; ++i) {
+ wchar_t tmp = str[i];
+ str[i] = str[n - 1 - i];
+ str[n - 1 - i] = tmp;
+ }
+}
+
+static size_t read_line(wchar_t sep, wchar_t *str, size_t n, FILE *stream)
+{
+ size_t r = 0;
+ while (r < n) {
+ wint_t c = fgetwc(stream);
+ if (c == WEOF)
+ break;
+ str[r++] = c;
+ if ((wchar_t) c == sep)
+ break;
+ }
+ return r;
+}
+
+static void write_line(wchar_t *str, size_t n, FILE *stream)
+{
+ for (size_t i = 0; i < n; i++)
+ fputwc(str[i], stream);
+}
+
+int main(int argc, char *argv[])
+{
+ char const *filename = "stdin";
+ wchar_t *buf;
+ wchar_t sep = L'\n';
+ size_t len, bufsiz = BUFSIZ;
+ FILE *fp = stdin;
+ int ch, rval = EXIT_SUCCESS;
+ uintmax_t line;
+
+ static const struct option longopts[] = {
+ { "zero", no_argument, NULL, '0' },
+ { "version", no_argument, NULL, 'V' },
+ { "help", no_argument, NULL, 'h' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ signal(SIGINT, sig_handler);
+ signal(SIGTERM, sig_handler);
+
+ while ((ch = getopt_long(argc, argv, "Vh0", longopts, NULL)) != -1)
+ switch(ch) {
+ case '0':
+ sep = L'\0';
+ break;
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ buf = xmalloc(bufsiz * sizeof(wchar_t));
+
+ do {
+ if (*argv) {
+ if ((fp = fopen(*argv, "r")) == NULL) {
+ warn(_("cannot open %s"), *argv );
+ rval = EXIT_FAILURE;
+ ++argv;
+ continue;
+ }
+ filename = *argv++;
+ }
+
+ line = 0;
+ while (!feof(fp)) {
+ len = read_line(sep, buf, bufsiz, fp);
+ if (len == 0)
+ continue;
+
+ /* This is my hack from setpwnam.c -janl */
+ while (len == bufsiz && !feof(fp)) {
+ /* Extend input buffer if it failed getting the whole line */
+ /* So now we double the buffer size */
+ bufsiz *= 2;
+
+ buf = xrealloc(buf, bufsiz * sizeof(wchar_t));
+
+ /* And fill the rest of the buffer */
+ len += read_line(sep, &buf[len], bufsiz/2, fp);
+ }
+ reverse_str(buf, buf[len - 1] == sep ? len - 1 : len);
+ write_line(buf, len, stdout);
+ line++;
+ }
+ if (ferror(fp)) {
+ warn("%s: %ju", filename, line);
+ rval = EXIT_FAILURE;
+ }
+ if (fp != stdin)
+ fclose(fp);
+ } while(*argv);
+
+ free(buf);
+ return rval;
+}
+