1 /* $OpenBSD: rev.c,v 1.9 2007/03/16 17:16:28 jasper 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 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1987, 1992, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95"; 42 #else 43 static char rcsid[] = "$OpenBSD: rev.c,v 1.9 2007/03/16 17:16:28 jasper Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 void usage(void); 57 58 int 59 main(int argc, char *argv[]) 60 { 61 char *filename, *p, *t; 62 FILE *fp; 63 size_t len; 64 int ch, rval; 65 66 while ((ch = getopt(argc, argv, "")) != -1) 67 switch(ch) { 68 case '?': 69 default: 70 usage(); 71 } 72 73 argc -= optind; 74 argv += optind; 75 76 fp = stdin; 77 filename = "stdin"; 78 rval = 0; 79 do { 80 if (*argv) { 81 if ((fp = fopen(*argv, "r")) == NULL) { 82 warn("%s", *argv); 83 rval = 1; 84 ++argv; 85 continue; 86 } 87 filename = *argv++; 88 } 89 while ((p = fgetln(fp, &len)) != NULL) { 90 if (p[len - 1] == '\n') 91 --len; 92 for (t = p + len - 1; t >= p; --t) 93 putchar(*t); 94 putchar('\n'); 95 } 96 if (ferror(fp)) { 97 warn("%s", filename); 98 rval = 1; 99 } 100 (void)fclose(fp); 101 } while(*argv); 102 exit(rval); 103 } 104 105 void 106 usage(void) 107 { 108 extern char *__progname; 109 110 (void)fprintf(stderr, "usage: %s [file ...]\n", __progname); 111 exit(1); 112 } 113