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 35 #include <sys/cdefs.h> 36 /* 37 * Echo command. 38 */ 39 40 #define main echocmd 41 42 #include "bltin.h" 43 44 /* #define eflag 1 */ 45 46 int 47 main(int argc, char *argv[]) 48 { 49 char **ap; 50 char *p; 51 char c; 52 int count; 53 int nflag = 0; 54 #ifndef eflag 55 int eflag = 0; 56 #endif 57 58 ap = argv; 59 if (argc) 60 ap++; 61 if ((p = *ap) != NULL) { 62 if (equal(p, "-n")) { 63 nflag++; 64 ap++; 65 } else if (equal(p, "-e")) { 66 #ifndef eflag 67 eflag++; 68 #endif 69 ap++; 70 } 71 } 72 while ((p = *ap++) != NULL) { 73 while ((c = *p++) != '\0') { 74 if (c == '\\' && eflag) { 75 switch (*p++) { 76 case 'a': c = '\a'; break; 77 case 'b': c = '\b'; break; 78 case 'c': return 0; /* exit */ 79 case 'e': c = '\033'; break; 80 case 'f': c = '\f'; break; 81 case 'n': c = '\n'; break; 82 case 'r': c = '\r'; break; 83 case 't': c = '\t'; break; 84 case 'v': c = '\v'; break; 85 case '\\': break; /* c = '\\' */ 86 case '0': 87 c = 0; 88 count = 3; 89 while (--count >= 0 && (unsigned)(*p - '0') < 8) 90 c = (c << 3) + (*p++ - '0'); 91 break; 92 default: 93 p--; 94 break; 95 } 96 } 97 putchar(c); 98 } 99 if (*ap) 100 putchar(' '); 101 } 102 if (! nflag) 103 putchar('\n'); 104 return 0; 105 } 106