echo.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 125 行

#ifndef lint
static CHTYPE *sccsid = "@(#)echo.c	4.1      7/17/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/
/*
 *
 *   Modification History:
 *
 * 001 - Gary Gaudet for Andy Gadsby 09-mar-88
 *	i18n version of csh
 *
 *
 *
 */

/*
 *	UNIX shell
 *
 *	Bell Telephone Laboratories
 *
 */
#include	"defs.h"

#define	exit(a)	flushb();return(a)

extern int exitval;

echo(argc, argv)
CHTYPE **argv;
{
	register CHTYPE	*cp;
	register int	i, wd;
	int	j;
	
	if(--argc == 0) {
		prc_buff('\n');
		exit(0);
	}

	for(i = 1; i <= argc; i++) 
	{
		sigchk();
		for(cp = argv[i]; *cp; cp++) 
		{
			if(*cp == '\\')
			switch(*++cp) 
			{
				case 'b':
					prc_buff('\b');
					continue;

				case 'c':
					exit(0);

				case 'f':
					prc_buff('\f');
					continue;

				case 'n':
					prc_buff('\n');
					continue;

				case 'r':
					prc_buff('\r');
					continue;

				case 't':
					prc_buff('\t');
					continue;

				case 'v':
					prc_buff('\v');
					continue;

				case '\\':
					prc_buff('\\');
					continue;
				case '0':
					j = wd = 0;
					while ((*++cp >= '0' && *cp <= '7') && j++ < 3) {
						wd <<= 3;
						wd |= (*cp - '0');
					}
					prc_buff(wd);
					--cp;
					continue;

				default:
					cp--;
			}
			prc_buff(*cp);
		}
		prc_buff(i == argc? '\n': ' ');
	}
	exit(0);
}