1 /*- 2 * Copyright (c) 1987, 1992 The Regents of the University of California. 3 * 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 char copyright[] = 36 "@(#) Copyright (c) 1987, 1992 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)rev.c 5.2 (Berkeley) 3/21/92"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 void usage __P((void)); 51 void warn __P((const char *, ...)); 52 53 int 54 main(argc, argv) 55 int argc; 56 char *argv[]; 57 { 58 register char *filename, *p, *t; 59 FILE *fp; 60 size_t len; 61 int ch, rval; 62 63 while ((ch = getopt(argc, argv, "")) != EOF) 64 switch(ch) { 65 case '?': 66 default: 67 usage(); 68 } 69 70 argc -= optind; 71 argv += optind; 72 73 fp = stdin; 74 filename = "stdin"; 75 rval = 0; 76 do { 77 if (*argv) { 78 if ((fp = fopen(*argv, "r")) == NULL) { 79 warn("%s: %s", *argv, strerror(errno)); 80 rval = 1; 81 ++argv; 82 continue; 83 } 84 filename = *argv++; 85 } 86 while (p = fgetline(fp, &len)) { 87 t = p + len - 1; 88 for (t = p + len - 1; t >= p; --t) 89 putchar(*t); 90 putchar('\n'); 91 } 92 if (ferror(fp)) { 93 warn("%s: %s", filename, strerror(errno)); 94 rval = 1; 95 } 96 (void)fclose(fp); 97 } while(*argv); 98 exit(rval); 99 } 100 101 #if __STDC__ 102 #include <stdarg.h> 103 #else 104 #include <varargs.h> 105 #endif 106 107 void 108 #if __STDC__ 109 warn(const char *fmt, ...) 110 #else 111 warn(fmt, va_alist) 112 char *fmt; 113 va_dcl 114 #endif 115 { 116 va_list ap; 117 #if __STDC__ 118 va_start(ap, fmt); 119 #else 120 va_start(ap); 121 #endif 122 (void)fprintf(stderr, "rev: "); 123 (void)vfprintf(stderr, fmt, ap); 124 va_end(ap); 125 (void)fprintf(stderr, "\n"); 126 } 127 128 void 129 usage() 130 { 131 (void)fprintf(stderr, "usage: rev [file ...]\n"); 132 exit(1); 133 } 134