1 /* $OpenBSD: rev.c,v 1.5 2002/02/16 21:27:51 millert 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1987, 1992, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95"; 46 #else 47 static char rcsid[] = "$OpenBSD: rev.c,v 1.5 2002/02/16 21:27:51 millert Exp $"; 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/types.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 void usage(void); 61 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 char *filename, *p, *t; 68 FILE *fp; 69 size_t len; 70 int ch, rval; 71 72 while ((ch = getopt(argc, argv, "")) != -1) 73 switch(ch) { 74 case '?': 75 default: 76 usage(); 77 } 78 79 argc -= optind; 80 argv += optind; 81 82 fp = stdin; 83 filename = "stdin"; 84 rval = 0; 85 do { 86 if (*argv) { 87 if ((fp = fopen(*argv, "r")) == NULL) { 88 warn("%s", *argv); 89 rval = 1; 90 ++argv; 91 continue; 92 } 93 filename = *argv++; 94 } 95 while ((p = fgetln(fp, &len)) != NULL) { 96 if (p[len - 1] == '\n') 97 --len; 98 t = p + len - 1; 99 for (t = p + len - 1; t >= p; --t) 100 putchar(*t); 101 putchar('\n'); 102 } 103 if (ferror(fp)) { 104 warn("%s", filename); 105 rval = 1; 106 } 107 (void)fclose(fp); 108 } while(*argv); 109 exit(rval); 110 } 111 112 void 113 usage() 114 { 115 (void)fprintf(stderr, "usage: rev [file ...]\n"); 116 exit(1); 117 } 118