1 /* $NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1987, 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95"; 45 #else 46 static char rcsid[] = "$NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 void usage __P((void)); 60 61 int 62 main(argc, argv) 63 int argc; 64 char *argv[]; 65 { 66 register char *filename, *p, *t; 67 FILE *fp; 68 size_t len; 69 int ch, rval; 70 71 while ((ch = getopt(argc, argv, "")) != EOF) 72 switch(ch) { 73 case '?': 74 default: 75 usage(); 76 } 77 78 argc -= optind; 79 argv += optind; 80 81 fp = stdin; 82 filename = "stdin"; 83 rval = 0; 84 do { 85 if (*argv) { 86 if ((fp = fopen(*argv, "r")) == NULL) { 87 warn("%s", *argv); 88 rval = 1; 89 ++argv; 90 continue; 91 } 92 filename = *argv++; 93 } 94 while ((p = fgetln(fp, &len)) != NULL) { 95 if (p[len - 1] == '\n') 96 --len; 97 t = p + len - 1; 98 for (t = p + len - 1; t >= p; --t) 99 putchar(*t); 100 putchar('\n'); 101 } 102 if (ferror(fp)) { 103 warn("%s", filename); 104 rval = 1; 105 } 106 (void)fclose(fp); 107 } while(*argv); 108 exit(rval); 109 } 110 111 void 112 usage() 113 { 114 (void)fprintf(stderr, "usage: rev [file ...]\n"); 115 exit(1); 116 } 117