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 8.1 (Berkeley) 5/31/93 37 */ 38 39 /* 40 * Echo command. 41 */ 42 43 #define main echocmd 44 45 #include "bltin.h" 46 47 /* #define eflag 1 */ 48 49 main(argc, argv) char **argv; { 50 register char **ap; 51 register char *p; 52 register char c; 53 int count; 54 int nflag = 0; 55 #ifndef eflag 56 int eflag = 0; 57 #endif 58 59 ap = argv; 60 if (argc) 61 ap++; 62 if ((p = *ap) != NULL) { 63 if (equal(p, "-n")) { 64 nflag++; 65 ap++; 66 } else if (equal(p, "-e")) { 67 #ifndef eflag 68 eflag++; 69 #endif 70 ap++; 71 } 72 } 73 while ((p = *ap++) != NULL) { 74 while ((c = *p++) != '\0') { 75 if (c == '\\' && eflag) { 76 switch (*p++) { 77 case 'b': c = '\b'; break; 78 case 'c': return 0; /* exit */ 79 case 'f': c = '\f'; break; 80 case 'n': c = '\n'; break; 81 case 'r': c = '\r'; break; 82 case 't': c = '\t'; break; 83 case 'v': c = '\v'; break; 84 case '\\': break; /* c = '\\' */ 85 case '0': 86 c = 0; 87 count = 3; 88 while (--count >= 0 && (unsigned)(*p - '0') < 8) 89 c = (c << 3) + (*p++ - '0'); 90 break; 91 default: 92 p--; 93 break; 94 } 95 } 96 putchar(c); 97 } 98 if (*ap) 99 putchar(' '); 100 } 101 if (! nflag) 102 putchar('\n'); 103 return 0; 104 } 105