/*- * Copyright (c) 1989, 1993 *	The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */#if defined(LIBC_SCCS) && !defined(lint)static char sccsid[] = "@(#)vis.c	8.1 (Berkeley) 7/19/93";#endif /* LIBC_SCCS and not lint */#include <sys/types.h>#include <limits.h>#include <ctype.h>#include <vis.h>#define	isoctal(c)	(((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')/* * vis - visually encode characters */char *vis(dst, c, flag, nextc)	register char *dst;	int c, nextc;	register int flag;{	if ((u_int)c <= UCHAR_MAX && isgraph(c) ||	   ((flag & VIS_SP) == 0 && c == ' ') ||	   ((flag & VIS_TAB) == 0 && c == '\t') ||	   ((flag & VIS_NL) == 0 && c == '\n') ||	   ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {		*dst++ = c;		if (c == '\\' && (flag & VIS_NOSLASH) == 0)			*dst++ = '\\';		*dst = '\0';		return (dst);	}	if (flag & VIS_CSTYLE) {		switch(c) {		case '\n':			*dst++ = '\\';			*dst++ = 'n';			goto done;		case '\r':			*dst++ = '\\';			*dst++ = 'r';			goto done;		case '\b':			*dst++ = '\\';			*dst++ = 'b';			goto done;#if __STDC__		case '\a':#else		case '\007':#endif			*dst++ = '\\';			*dst++ = 'a';			goto done;		case '\v':			*dst++ = '\\';			*dst++ = 'v';			goto done;		case '\t':			*dst++ = '\\';			*dst++ = 't';			goto done;		case '\f':			*dst++ = '\\';			*dst++ = 'f';			goto done;		case ' ':			*dst++ = '\\';			*dst++ = 's';			goto done;		case '\0':			*dst++ = '\\';			*dst++ = '0';			if (isoctal(nextc)) {				*dst++ = '0';				*dst++ = '0';			}			goto done;		}	}	if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {			*dst++ = '\\';		*dst++ = ((u_char)c >> 6 & 07) + '0';		*dst++ = ((u_char)c >> 3 & 07) + '0';		*dst++ = ((u_char)c & 07) + '0';		goto done;	}	if ((flag & VIS_NOSLASH) == 0)		*dst++ = '\\';	if (c & 0200) {		c &= 0177;		*dst++ = 'M';	}	if (iscntrl(c)) {		*dst++ = '^';		if (c == 0177)			*dst++ = '?';		else			*dst++ = c + '@';	} else {		*dst++ = '-';		*dst++ = c;	}done:	*dst = '\0';	return (dst);}/* * strvis, strvisx - visually encode characters from src into dst *	 *	Dst must be 4 times the size of src to account for possible *	expansion.  The length of dst, not including the trailing NULL, *	is returned.  * *	Strvisx encodes exactly len bytes from src into dst. *	This is useful for encoding a block of data. */intstrvis(dst, src, flag)	register char *dst;	register const char *src;	int flag;{	register char c;	char *start;	for (start = dst; c = *src;)		dst = vis(dst, c, flag, *++src);	*dst = '\0';	return (dst - start);}intstrvisx(dst, src, len, flag)	register char *dst;	register const char *src;	register size_t len;	int flag;{	int c;	char *start;	for (start = dst; len > 1; len--) {		c = *src;		dst = vis(dst, c, flag, *++src);	}	if (len)		dst = vis(dst, *src, flag, '\0');	*dst = '\0';	return (dst - start);}