1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)echo.c 8.2 (Berkeley) 5/4/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 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(int argc, char *argv[]) 52 { 53 char **ap; 54 char *p; 55 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 'a': c = '\a'; break; 81 case 'b': c = '\b'; break; 82 case 'c': return 0; /* exit */ 83 case 'e': c = '\033'; break; 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