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(int argc, char *argv[]) 62 { 63 const char *filename, *p, *t; 64 FILE *fp; 65 size_t len; 66 int ch, rval; 67 68 while ((ch = getopt(argc, argv, "")) != -1) 69 switch(ch) { 70 case '?': 71 default: 72 usage(); 73 } 74 75 argc -= optind; 76 argv += optind; 77 78 fp = stdin; 79 filename = "stdin"; 80 rval = 0; 81 do { 82 if (*argv) { 83 if ((fp = fopen(*argv, "r")) == NULL) { 84 warn("%s", *argv); 85 rval = 1; 86 ++argv; 87 continue; 88 } 89 filename = *argv++; 90 } 91 while ((p = fgetln(fp, &len)) != NULL) { 92 if (p[len - 1] == '\n') 93 --len; 94 t = p + len - 1; 95 for (t = p + len - 1; t >= p; --t) 96 putchar(*t); 97 putchar('\n'); 98 } 99 if (ferror(fp)) { 100 warn("%s", filename); 101 rval = 1; 102 } 103 (void)fclose(fp); 104 } while(*argv); 105 exit(rval); 106 } 107 108 void 109 usage(void) 110 { 111 (void)fprintf(stderr, "usage: rev [file ...]\n"); 112 exit(1); 113 } 114