1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 34 #include <err.h> 35 #include <errno.h> 36 #include <locale.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <wchar.h> 42 43 static void usage(void) __dead2; 44 45 int 46 main(int argc, char *argv[]) 47 { 48 const char *filename; 49 wchar_t *p, *t; 50 FILE *fp; 51 size_t len; 52 int ch, rval; 53 54 setlocale(LC_ALL, ""); 55 56 while ((ch = getopt(argc, argv, "")) != -1) 57 switch(ch) { 58 case '?': 59 default: 60 usage(); 61 } 62 63 argc -= optind; 64 argv += optind; 65 66 fp = stdin; 67 filename = "stdin"; 68 rval = 0; 69 do { 70 if (*argv) { 71 if ((fp = fopen(*argv, "r")) == NULL) { 72 warn("%s", *argv); 73 rval = 1; 74 ++argv; 75 continue; 76 } 77 filename = *argv++; 78 } 79 while ((p = fgetwln(fp, &len)) != NULL) { 80 if (p[len - 1] == '\n') 81 --len; 82 for (t = p + len - 1; t >= p; --t) 83 putwchar(*t); 84 putwchar('\n'); 85 } 86 if (ferror(fp)) { 87 warn("%s", filename); 88 clearerr(fp); 89 rval = 1; 90 } 91 (void)fclose(fp); 92 } while(*argv); 93 exit(rval); 94 } 95 96 void 97 usage(void) 98 { 99 (void)fprintf(stderr, "usage: rev [file ...]\n"); 100 exit(1); 101 } 102