1 /* $OpenBSD: rev.c,v 1.16 2022/02/08 17:44:18 cheloha Exp $ */ 2 /* $NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $ */ 3 4 /*- 5 * Copyright (c) 1987, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <locale.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 int multibyte; 44 45 int isu8cont(unsigned char); 46 int rev_file(const char *); 47 void usage(void); 48 49 int 50 main(int argc, char *argv[]) 51 { 52 int ch, rval; 53 54 setlocale(LC_CTYPE, ""); 55 multibyte = MB_CUR_MAX > 1; 56 57 if (pledge("stdio rpath", NULL) == -1) 58 err(1, "pledge"); 59 60 while ((ch = getopt(argc, argv, "")) != -1) 61 switch(ch) { 62 default: 63 usage(); 64 } 65 66 argc -= optind; 67 argv += optind; 68 69 rval = 0; 70 if (argc == 0) { 71 if (pledge("stdio", NULL) == -1) 72 err(1, "pledge"); 73 74 rval = rev_file(NULL); 75 } else { 76 for (; *argv != NULL; argv++) 77 rval |= rev_file(*argv); 78 } 79 return rval; 80 } 81 82 int 83 isu8cont(unsigned char c) 84 { 85 return (c & (0x80 | 0x40)) == 0x80; 86 } 87 88 int 89 rev_file(const char *path) 90 { 91 char *p = NULL, *t, *te, *u; 92 const char *filename; 93 FILE *fp; 94 size_t ps = 0; 95 ssize_t len; 96 int rval = 0; 97 98 if (path != NULL) { 99 fp = fopen(path, "r"); 100 if (fp == NULL) { 101 warn("%s", path); 102 return 1; 103 } 104 filename = path; 105 } else { 106 fp = stdin; 107 filename = "stdin"; 108 } 109 110 while ((len = getline(&p, &ps, fp)) != -1) { 111 if (p[len - 1] == '\n') 112 --len; 113 for (t = p + len - 1; t >= p; --t) { 114 te = t; 115 if (multibyte) 116 while (t > p && isu8cont(*t)) 117 --t; 118 for (u = t; u <= te; ++u) 119 if (putchar(*u) == EOF) 120 err(1, "stdout"); 121 } 122 if (putchar('\n') == EOF) 123 err(1, "stdout"); 124 } 125 free(p); 126 if (ferror(fp)) { 127 warn("%s", filename); 128 rval = 1; 129 } 130 131 (void)fclose(fp); 132 133 return rval; 134 } 135 136 void 137 usage(void) 138 { 139 extern char *__progname; 140 141 (void)fprintf(stderr, "usage: %s [file ...]\n", __progname); 142 exit(1); 143 } 144