1 /* $NetBSD: echo.c,v 1.7 1995/03/21 09:10:49 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)echo.c 8.1 (Berkeley) 5/31/93 39 */ 40 41 /* 42 * Echo command. 43 */ 44 45 #define main echocmd 46 47 #include "bltin.h" 48 49 /* #define eflag 1 */ 50 51 main(argc, argv) char **argv; { 52 register char **ap; 53 register char *p; 54 register char c; 55 int count; 56 int nflag = 0; 57 #ifndef eflag 58 int eflag = 0; 59 #endif 60 61 ap = argv; 62 if (argc) 63 ap++; 64 if ((p = *ap) != NULL) { 65 if (equal(p, "-n")) { 66 nflag++; 67 ap++; 68 } else if (equal(p, "-e")) { 69 #ifndef eflag 70 eflag++; 71 #endif 72 ap++; 73 } 74 } 75 while ((p = *ap++) != NULL) { 76 while ((c = *p++) != '\0') { 77 if (c == '\\' && eflag) { 78 switch (*p++) { 79 case 'b': c = '\b'; break; 80 case 'c': return 0; /* exit */ 81 case 'f': c = '\f'; break; 82 case 'n': c = '\n'; break; 83 case 'r': c = '\r'; break; 84 case 't': c = '\t'; break; 85 case 'v': c = '\v'; break; 86 case '\\': break; /* c = '\\' */ 87 case '0': 88 c = 0; 89 count = 3; 90 while (--count >= 0 && (unsigned)(*p - '0') < 8) 91 c = (c << 3) + (*p++ - '0'); 92 break; 93 default: 94 p--; 95 break; 96 } 97 } 98 putchar(c); 99 } 100 if (*ap) 101 putchar(' '); 102 } 103 if (! nflag) 104 putchar('\n'); 105 return 0; 106 } 107