1 /*- 2 * Copyright (c) 1987, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1987, 1992, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 void usage __P((void)); 54 55 int 56 main(argc, argv) 57 int argc; 58 char *argv[]; 59 { 60 register char *filename, *p, *t; 61 FILE *fp; 62 size_t len; 63 int ch, rval; 64 65 while ((ch = getopt(argc, argv, "")) != -1) 66 switch(ch) { 67 case '?': 68 default: 69 usage(); 70 } 71 72 argc -= optind; 73 argv += optind; 74 75 fp = stdin; 76 filename = "stdin"; 77 rval = 0; 78 do { 79 if (*argv) { 80 if ((fp = fopen(*argv, "r")) == NULL) { 81 warn("%s", *argv); 82 rval = 1; 83 ++argv; 84 continue; 85 } 86 filename = *argv++; 87 } 88 while ((p = fgetln(fp, &len)) != NULL) { 89 if (p[len - 1] == '\n') 90 --len; 91 t = p + len - 1; 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() 107 { 108 (void)fprintf(stderr, "usage: rev [file ...]\n"); 109 exit(1); 110 } 111