1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)echo.c 8.1 (Berkeley) 5/31/93 37 * $Id: echo.c,v 1.2 1994/09/24 02:58:29 davidg Exp $ 38 */ 39 40 /* 41 * Echo command. 42 */ 43 44 #ifdef main 45 #undef main 46 #endif 47 #define main echocmd 48 49 #include "bltin.h" 50 51 /* #define eflag 1 */ 52 53 main(argc, argv) char **argv; { 54 register char **ap; 55 register char *p; 56 register char c; 57 int count; 58 int nflag = 0; 59 #ifndef eflag 60 int eflag = 0; 61 #endif 62 63 ap = argv; 64 if (argc) 65 ap++; 66 if ((p = *ap) != NULL) { 67 if (equal(p, "-n")) { 68 nflag++; 69 ap++; 70 } else if (equal(p, "-e")) { 71 #ifndef eflag 72 eflag++; 73 #endif 74 ap++; 75 } 76 } 77 while ((p = *ap++) != NULL) { 78 while ((c = *p++) != '\0') { 79 if (c == '\\' && eflag) { 80 switch (*p++) { 81 case 'b': c = '\b'; break; 82 case 'c': return 0; /* exit */ 83 case 'f': c = '\f'; break; 84 case 'n': c = '\n'; break; 85 case 'r': c = '\r'; break; 86 case 't': c = '\t'; break; 87 case 'v': c = '\v'; break; 88 case '\\': break; /* c = '\\' */ 89 case '0': 90 c = 0; 91 count = 3; 92 while (--count >= 0 && (unsigned)(*p - '0') < 8) 93 c = (c << 3) + (*p++ - '0'); 94 break; 95 default: 96 p--; 97 break; 98 } 99 } 100 putchar(c); 101 } 102 if (*ap) 103 putchar(' '); 104 } 105 if (! nflag) 106 putchar('\n'); 107 return 0; 108 } 109