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 /* 39 * Echo command. 40 */ 41 42 #define main echocmd 43 44 #include "bltin.h" 45 46 /* #define eflag 1 */ 47 48 int 49 main(int argc, char *argv[]) 50 { 51 char **ap; 52 char *p; 53 char c; 54 int count; 55 int nflag = 0; 56 #ifndef eflag 57 int eflag = 0; 58 #endif 59 60 ap = argv; 61 if (argc) 62 ap++; 63 if ((p = *ap) != NULL) { 64 if (equal(p, "-n")) { 65 nflag++; 66 ap++; 67 } else if (equal(p, "-e")) { 68 #ifndef eflag 69 eflag++; 70 #endif 71 ap++; 72 } 73 } 74 while ((p = *ap++) != NULL) { 75 while ((c = *p++) != '\0') { 76 if (c == '\\' && eflag) { 77 switch (*p++) { 78 case 'a': c = '\a'; break; 79 case 'b': c = '\b'; break; 80 case 'c': return 0; /* exit */ 81 case 'e': c = '\033'; break; 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