117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
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/* $NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)echo.c 8.1 (Berkeley) 5/31/93
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*/
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/*
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* Echo command.
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*
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* echo is steeped in tradition - several of them!
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* netbsd has supported 'echo [-n | -e] args' in spite of -e not being
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* documented anywhere.
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* Posix requires that -n be supported, output from strings containing
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* \ is implementation defined
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* The Single Unix Spec requires that \ escapes be treated as if -e
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* were set, but that -n not be treated as an option.
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* (ksh supports 'echo [-eEn] args', but not -- so that it is actually
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* impossible to actually output '-n')
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*
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* It is suggested that 'printf "%b" "string"' be used to get \ sequences
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* expanded. printf is now a builtin of netbsd's sh and csh.
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*/
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//#define main echocmd
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#include "bltin.h"
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int
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echocmd(int argc, char **argv)
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{
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char **ap;
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char *p;
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char c;
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int count;
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int nflag = 0;
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int eflag = 0;
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ap = argv;
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if (argc)
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ap++;
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if ((p = *ap) != NULL) {
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if (equal(p, "-n")) {
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nflag = 1;
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ap++;
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} else if (equal(p, "-e")) {
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eflag = 1;
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ap++;
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}
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}
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while ((p = *ap++) != NULL) {
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while ((c = *p++) != '\0') {
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if (c == '\\' && eflag) {
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switch (*p++) {
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case 'a': c = '\a'; break; /* bell */
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case 'b': c = '\b'; break;
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case 'c': return 0; /* exit */
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case 'e': c = 033; break; /* escape */
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 't': c = '\t'; break;
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case 'v': c = '\v'; break;
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case '\\': break; /* c = '\\' */
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case '0':
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c = 0;
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count = 3;
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while (--count >= 0 && (unsigned)(*p - '0') < 8)
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c = (c << 3) + (*p++ - '0');
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break;
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default:
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/* Output the '/' and char following */
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p--;
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break;
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}
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}
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putchar(c);
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}
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if (*ap)
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putchar(' ');
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}
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if (! nflag)
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putchar('\n');
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return 0;
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}
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