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 1.7 1997/02/22 13:58:59 peter Exp $ 38 */ 39 40 /* 41 * Echo command. 42 */ 43 44 #define main echocmd 45 46 #include "bltin.h" 47 48 /* #define eflag 1 */ 49 50 int 51 main(argc, argv) 52 int argc; 53 char **argv; 54 { 55 char **ap; 56 char *p; 57 char c; 58 int count; 59 int nflag = 0; 60 #ifndef eflag 61 int eflag = 0; 62 #endif 63 64 ap = argv; 65 if (argc) 66 ap++; 67 if ((p = *ap) != NULL) { 68 if (equal(p, "-n")) { 69 nflag++; 70 ap++; 71 } else if (equal(p, "-e")) { 72 #ifndef eflag 73 eflag++; 74 #endif 75 ap++; 76 } 77 } 78 while ((p = *ap++) != NULL) { 79 while ((c = *p++) != '\0') { 80 if (c == '\\' && eflag) { 81 switch (*p++) { 82 case 'b': c = '\b'; break; 83 case 'c': return 0; /* exit */ 84 case 'f': c = '\f'; break; 85 case 'n': c = '\n'; break; 86 case 'r': c = '\r'; break; 87 case 't': c = '\t'; break; 88 case 'v': c = '\v'; break; 89 case '\\': break; /* c = '\\' */ 90 case '0': 91 c = 0; 92 count = 3; 93 while (--count >= 0 && (unsigned)(*p - '0') < 8) 94 c = (c << 3) + (*p++ - '0'); 95 break; 96 default: 97 p--; 98 break; 99 } 100 } 101 putchar(c); 102 } 103 if (*ap) 104 putchar(' '); 105 } 106 if (! nflag) 107 putchar('\n'); 108 return 0; 109 } 110