/*
 * $Copyright:	$
 * Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
 * Sequent Computer Systems, Inc.   All rights reserved.
 *  
 * This software is furnished under a license and may be used
 * only in accordance with the terms of that license and with the
 * inclusion of the above copyright notice.   This software may not
 * be provided or otherwise made available to, or used by, any
 * other person.  No title to or ownership of the software is
 * hereby transferred."
 *
 */
/*	Copyright (c) 1984 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

#ident	"@(#)libgen:strecnt.c	1.1"
/*
	strecnt(output, input, except, cnt)
	strccnt copys the input string to the output string expanding
	any non-graphic character with the C escape sequence.
	Esacpe sequences produced are those defined in "The C Programming
	Language" pages 180-181.
	Characters in the except string will not be expanded.
	strecnt returns the address of the null-byte at the end of the output.
*/

#include	<ctype.h>
#include	<string.h>
#include	"libgen.h"


char *
strecnt( pout, pin, except, cnt )
register char	*pout;
register char	*pin;
char		*except;
register int	cnt;
{
	register unsigned	c;

	while( cnt-- ) {
		if( !isprint( c )  &&  ( !except  ||  !strchr( except, c ) ) ) {
			*pout++ = '\\';
			switch( c ) {
			case '\n':
				*pout++ = 'n';
				continue;
			case '\t':
				*pout++ = 't';
				continue;
			case '\b':
				*pout++ = 'b';
				continue;
			case '\r':
				*pout++ = 'r';
				continue;
			case '\f':
				*pout++ = 'f';
				continue;
			case '\v':
				*pout++ = 'v';
				continue;
			case '\\':
				continue;
			default:
				sprintf( pout, "%.3o", c );
				pout += 3;
				continue;
			}
		}
		if( c == '\\'  &&  ( !except  ||  !strchr( except, c ) ) )
			*pout++ = '\\';
		*pout++ = c;
	}
	*pout = '\0';
	return  pout;
}
