1 /* $NetBSD: echo.c,v 1.8 1996/11/02 18:26:06 christos 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 int 52 main(argc, argv) char **argv; { 53 register char **ap; 54 register char *p; 55 register char c; 56 int count; 57 int nflag = 0; 58 #ifndef eflag 59 int eflag = 0; 60 #endif 61 62 ap = argv; 63 if (argc) 64 ap++; 65 if ((p = *ap) != NULL) { 66 if (equal(p, "-n")) { 67 nflag++; 68 ap++; 69 } else if (equal(p, "-e")) { 70 #ifndef eflag 71 eflag++; 72 #endif 73 ap++; 74 } 75 } 76 while ((p = *ap++) != NULL) { 77 while ((c = *p++) != '\0') { 78 if (c == '\\' && eflag) { 79 switch (*p++) { 80 case 'b': c = '\b'; break; 81 case 'c': return 0; /* exit */ 82 case 'f': c = '\f'; break; 83 case 'n': c = '\n'; break; 84 case 'r': c = '\r'; break; 85 case 't': c = '\t'; break; 86 case 'v': c = '\v'; break; 87 case '\\': break; /* c = '\\' */ 88 case '0': 89 c = 0; 90 count = 3; 91 while (--count >= 0 && (unsigned)(*p - '0') < 8) 92 c = (c << 3) + (*p++ - '0'); 93 break; 94 default: 95 p--; 96 break; 97 } 98 } 99 putchar(c); 100 } 101 if (*ap) 102 putchar(' '); 103 } 104 if (! nflag) 105 putchar('\n'); 106 return 0; 107 } 108