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