1 /* $OpenBSD: rev.c,v 1.10 2009/10/27 23:59:42 deraadt 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 <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 void usage(void); 43 44 int 45 main(int argc, char *argv[]) 46 { 47 char *filename, *p, *t; 48 FILE *fp; 49 size_t len; 50 int ch, rval; 51 52 while ((ch = getopt(argc, argv, "")) != -1) 53 switch(ch) { 54 case '?': 55 default: 56 usage(); 57 } 58 59 argc -= optind; 60 argv += optind; 61 62 fp = stdin; 63 filename = "stdin"; 64 rval = 0; 65 do { 66 if (*argv) { 67 if ((fp = fopen(*argv, "r")) == NULL) { 68 warn("%s", *argv); 69 rval = 1; 70 ++argv; 71 continue; 72 } 73 filename = *argv++; 74 } 75 while ((p = fgetln(fp, &len)) != NULL) { 76 if (p[len - 1] == '\n') 77 --len; 78 for (t = p + len - 1; t >= p; --t) 79 putchar(*t); 80 putchar('\n'); 81 } 82 if (ferror(fp)) { 83 warn("%s", filename); 84 rval = 1; 85 } 86 (void)fclose(fp); 87 } while(*argv); 88 exit(rval); 89 } 90 91 void 92 usage(void) 93 { 94 extern char *__progname; 95 96 (void)fprintf(stderr, "usage: %s [file ...]\n", __progname); 97 exit(1); 98 } 99