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 8.2 (Berkeley) 1/2/94"; 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 52 void usage __P((void)); 53 54 int 55 main(argc, argv) 56 int argc; 57 char *argv[]; 58 { 59 register char *filename, *p, *t; 60 FILE *fp; 61 size_t len; 62 int ch, rval; 63 64 while ((ch = getopt(argc, argv, "")) != EOF) 65 switch(ch) { 66 case '?': 67 default: 68 usage(); 69 } 70 71 argc -= optind; 72 argv += optind; 73 74 fp = stdin; 75 filename = "stdin"; 76 rval = 0; 77 do { 78 if (*argv) { 79 if ((fp = fopen(*argv, "r")) == NULL) { 80 warn("%s", *argv); 81 rval = 1; 82 ++argv; 83 continue; 84 } 85 filename = *argv++; 86 } 87 while ((p = fgetln(fp, &len)) != NULL) { 88 if (p[len - 1] == '\n') 89 --len; 90 t = p + len - 1; 91 for (t = p + len - 1; t >= p; --t) 92 putchar(*t); 93 putchar('\n'); 94 } 95 if (ferror(fp)) { 96 warn("%s", filename); 97 rval = 1; 98 } 99 (void)fclose(fp); 100 } while(*argv); 101 exit(rval); 102 } 103 104 void 105 usage() 106 { 107 (void)fprintf(stderr, "usage: rev [file ...]\n"); 108 exit(1); 109 } 110