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 8.2 (Berkeley) 5/4/95 37 * $Id: echo.c,v 1.3 1995/08/23 05:31:06 pst 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 int 54 main(argc, argv) 55 int argc; 56 char **argv; 57 { 58 register char **ap; 59 register char *p; 60 register char c; 61 int count; 62 int nflag = 0; 63 #ifndef eflag 64 int eflag = 0; 65 #endif 66 67 ap = argv; 68 if (argc) 69 ap++; 70 if ((p = *ap) != NULL) { 71 if (equal(p, "-n")) { 72 nflag++; 73 ap++; 74 } else if (equal(p, "-e")) { 75 #ifndef eflag 76 eflag++; 77 #endif 78 ap++; 79 } 80 } 81 while ((p = *ap++) != NULL) { 82 while ((c = *p++) != '\0') { 83 if (c == '\\' && eflag) { 84 switch (*p++) { 85 case 'b': c = '\b'; break; 86 case 'c': return 0; /* exit */ 87 case 'f': c = '\f'; break; 88 case 'n': c = '\n'; break; 89 case 'r': c = '\r'; break; 90 case 't': c = '\t'; break; 91 case 'v': c = '\v'; break; 92 case '\\': break; /* c = '\\' */ 93 case '0': 94 c = 0; 95 count = 3; 96 while (--count >= 0 && (unsigned)(*p - '0') < 8) 97 c = (c << 3) + (*p++ - '0'); 98 break; 99 default: 100 p--; 101 break; 102 } 103 } 104 putchar(c); 105 } 106 if (*ap) 107 putchar(' '); 108 } 109 if (! nflag) 110 putchar('\n'); 111 return 0; 112 } 113