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 * $DragonFly: src/usr.bin/rev/rev.c,v 1.4 2003/11/03 19:31:32 eirikn Exp $ 36 */ 37 38 #include <sys/types.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 void usage(void); 48 49 int 50 main(argc, argv) 51 int argc; 52 char *argv[]; 53 { 54 register char *filename, *p, *t; 55 FILE *fp; 56 size_t len; 57 int ch, rval; 58 59 while ((ch = getopt(argc, argv, "")) != -1) 60 switch(ch) { 61 case '?': 62 default: 63 usage(); 64 } 65 66 argc -= optind; 67 argv += optind; 68 69 fp = stdin; 70 filename = "stdin"; 71 rval = 0; 72 do { 73 if (*argv) { 74 if ((fp = fopen(*argv, "r")) == NULL) { 75 warn("%s", *argv); 76 rval = 1; 77 ++argv; 78 continue; 79 } 80 filename = *argv++; 81 } 82 while ((p = fgetln(fp, &len)) != NULL) { 83 if (p[len - 1] == '\n') 84 --len; 85 t = p + len - 1; 86 for (t = p + len - 1; t >= p; --t) 87 putchar(*t); 88 putchar('\n'); 89 } 90 if (ferror(fp)) { 91 warn("%s", filename); 92 rval = 1; 93 } 94 (void)fclose(fp); 95 } while(*argv); 96 exit(rval); 97 } 98 99 void 100 usage() 101 { 102 (void)fprintf(stderr, "usage: rev [file ...]\n"); 103 exit(1); 104 } 105