| 1 | /* $NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | *
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| 34 | * @(#)echo.c 8.1 (Berkeley) 5/31/93
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| 35 | */
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| 36 |
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| 37 | /*
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| 38 | * Echo command.
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| 39 | *
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| 40 | * echo is steeped in tradition - several of them!
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| 41 | * netbsd has supported 'echo [-n | -e] args' in spite of -e not being
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| 42 | * documented anywhere.
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| 43 | * Posix requires that -n be supported, output from strings containing
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| 44 | * \ is implementation defined
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| 45 | * The Single Unix Spec requires that \ escapes be treated as if -e
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| 46 | * were set, but that -n not be treated as an option.
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| 47 | * (ksh supports 'echo [-eEn] args', but not -- so that it is actually
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| 48 | * impossible to actually output '-n')
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| 49 | *
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| 50 | * It is suggested that 'printf "%b" "string"' be used to get \ sequences
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| 51 | * expanded. printf is now a builtin of netbsd's sh and csh.
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| 52 | */
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| 53 |
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| 54 | #include "shinstance.h"
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| 55 | #include "builtins.h"
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| 56 |
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| 57 | int
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| 58 | echocmd(shinstance *psh, int argc, char **argv)
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| 59 | {
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| 60 | char **ap;
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| 61 | const char *p;
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| 62 | int nflag = 0;
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| 63 | int eflag = 0;
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| 64 |
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| 65 | ap = argv;
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| 66 | if (argc)
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| 67 | ap++;
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| 68 |
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| 69 | if ((p = *ap) != NULL && *p == '-') {
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| 70 | if (p[1] == 'n' && !p[2]) {
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| 71 | nflag = 1;
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| 72 | ap++;
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| 73 | } else if (p[1] == 'e' && !p[2]) {
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| 74 | eflag = 1;
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| 75 | ap++;
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | while ((p = *ap++) != NULL) {
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| 80 | if (!eflag) {
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| 81 | out1str(psh, p);
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| 82 | } else {
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| 83 | char c;
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| 84 | int count;
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| 85 |
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| 86 | while ((c = *p++) != '\0') {
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| 87 | if (c == '\\') {
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| 88 | switch (*p++) {
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| 89 | case 'a': c = '\a'; break; /* bell */
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| 90 | case 'b': c = '\b'; break;
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| 91 | case 'c': return 0; /* exit */
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| 92 | case 'e': c = 033; break; /* escape */
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| 93 | case 'f': c = '\f'; break;
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| 94 | case 'n': c = '\n'; break;
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| 95 | case 'r': c = '\r'; break;
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| 96 | case 't': c = '\t'; break;
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| 97 | case 'v': c = '\v'; break;
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| 98 | case '\\': break; /* c = '\\' */
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| 99 | case '0':
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| 100 | c = 0;
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| 101 | count = 3;
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| 102 | while (--count >= 0 && (unsigned)(*p - '0') < 8)
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| 103 | c = (c << 3) + (*p++ - '0');
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| 104 | break;
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| 105 | default:
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| 106 | /* Output the '/' and char following */
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| 107 | p--;
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| 108 | break;
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| 109 | }
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| 110 | }
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| 111 | out1c(psh, c);
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| 112 | }
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| 113 | }
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| 114 | if (*ap)
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| 115 | out1c(psh, ' ');
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| 116 | }
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| 117 | if (! nflag)
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| 118 | out1c(psh, '\n');
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| 119 | return 0;
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| 120 | }
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