143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/* $OpenBSD: rev.c,v 1.16 2022/02/08 17:44:18 cheloha Exp $ */
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/* $NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $ */
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/*-
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* Copyright (c) 1987, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int multibyte;
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int isu8cont(unsigned char);
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int rev_file(const char *);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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int ch, rval;
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setlocale(LC_CTYPE, "");
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multibyte = MB_CUR_MAX > 1;
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if (pledge("stdio rpath", NULL) == -1)
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err(1, "pledge");
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while ((ch = getopt(argc, argv, "")) != -1)
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switch(ch) {
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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rval = 0;
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if (argc == 0) {
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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rval = rev_file(NULL);
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} else {
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for (; *argv != NULL; argv++)
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rval |= rev_file(*argv);
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}
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return rval;
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}
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int
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isu8cont(unsigned char c)
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{
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return (c & (0x80 | 0x40)) == 0x80;
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}
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int
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rev_file(const char *path)
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{
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char *p = NULL, *t, *te, *u;
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const char *filename;
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FILE *fp;
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size_t ps = 0;
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ssize_t len;
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int rval = 0;
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if (path != NULL) {
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fp = fopen(path, "r");
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if (fp == NULL) {
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warn("%s", path);
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return 1;
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}
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filename = path;
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} else {
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fp = stdin;
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filename = "stdin";
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}
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while ((len = getline(&p, &ps, fp)) != -1) {
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if (p[len - 1] == '\n')
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--len;
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for (t = p + len - 1; t >= p; --t) {
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te = t;
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if (multibyte)
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while (t > p && isu8cont(*t))
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--t;
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for (u = t; u <= te; ++u)
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if (putchar(*u) == EOF)
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err(1, "stdout");
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}
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if (putchar('\n') == EOF)
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err(1, "stdout");
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}
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free(p);
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if (ferror(fp)) {
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warn("%s", filename);
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rval = 1;
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}
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(void)fclose(fp);
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return rval;
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}
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void
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usage(void)
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{
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extern char *__progname;
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(void)fprintf(stderr, "usage: %s [file ...]\n", __progname);
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exit(1);
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}
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