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 const 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 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95"; 43 #endif /* not lint */ 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 void usage(void); 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 const char *filename, *p, *t; 66 FILE *fp; 67 size_t len; 68 int ch, rval; 69 70 while ((ch = getopt(argc, argv, "")) != -1) 71 switch(ch) { 72 case '?': 73 default: 74 usage(); 75 } 76 77 argc -= optind; 78 argv += optind; 79 80 fp = stdin; 81 filename = "stdin"; 82 rval = 0; 83 do { 84 if (*argv) { 85 if ((fp = fopen(*argv, "r")) == NULL) { 86 warn("%s", *argv); 87 rval = 1; 88 ++argv; 89 continue; 90 } 91 filename = *argv++; 92 } 93 while ((p = fgetln(fp, &len)) != NULL) { 94 if (p[len - 1] == '\n') 95 --len; 96 t = p + len - 1; 97 for (t = p + len - 1; t >= p; --t) 98 putchar(*t); 99 putchar('\n'); 100 } 101 if (ferror(fp)) { 102 warn("%s", filename); 103 rval = 1; 104 } 105 (void)fclose(fp); 106 } while(*argv); 107 exit(rval); 108 } 109 110 void 111 usage() 112 { 113 (void)fprintf(stderr, "usage: rev [file ...]\n"); 114 exit(1); 115 } 116