GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/gen/vis.c Lines: 0 101 0.0 %
Date: 2017-11-13 Branches: 0 124 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: vis.c,v 1.25 2015/09/13 11:32:51 guenther Exp $ */
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/*-
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 * Copyright (c) 1989, 1993
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 *	The Regents of the University of California.  All rights reserved.
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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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#include <sys/types.h>
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#include <errno.h>
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#include <ctype.h>
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#include <limits.h>
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#include <string.h>
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#include <stdlib.h>
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#include <vis.h>
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#define	isoctal(c)	(((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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#define	isvisible(c,flag)						\
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	(((c) == '\\' || (flag & VIS_ALL) == 0) &&			\
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	(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) &&		\
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	(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') ||	\
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		(flag & VIS_GLOB) == 0) && isgraph((u_char)(c))) ||	\
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	((flag & VIS_SP) == 0 && (c) == ' ') ||				\
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	((flag & VIS_TAB) == 0 && (c) == '\t') ||			\
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	((flag & VIS_NL) == 0 && (c) == '\n') ||			\
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	((flag & VIS_SAFE) && ((c) == '\b' ||				\
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		(c) == '\007' || (c) == '\r' ||				\
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		isgraph((u_char)(c))))))
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/*
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 * vis - visually encode characters
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 */
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char *
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vis(char *dst, int c, int flag, int nextc)
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{
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	if (isvisible(c, flag)) {
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		if ((c == '"' && (flag & VIS_DQ) != 0) ||
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		    (c == '\\' && (flag & VIS_NOSLASH) == 0))
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			*dst++ = '\\';
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		*dst++ = c;
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		*dst = '\0';
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		return (dst);
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	}
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	if (flag & VIS_CSTYLE) {
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		switch(c) {
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		case '\n':
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			*dst++ = '\\';
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			*dst++ = 'n';
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			goto done;
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		case '\r':
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			*dst++ = '\\';
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			*dst++ = 'r';
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			goto done;
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		case '\b':
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			*dst++ = '\\';
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			*dst++ = 'b';
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			goto done;
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		case '\a':
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			*dst++ = '\\';
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			*dst++ = 'a';
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			goto done;
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		case '\v':
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			*dst++ = '\\';
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			*dst++ = 'v';
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			goto done;
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		case '\t':
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			*dst++ = '\\';
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			*dst++ = 't';
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			goto done;
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		case '\f':
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			*dst++ = '\\';
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			*dst++ = 'f';
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			goto done;
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		case ' ':
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			*dst++ = '\\';
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			*dst++ = 's';
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			goto done;
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		case '\0':
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			*dst++ = '\\';
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			*dst++ = '0';
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			if (isoctal(nextc)) {
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				*dst++ = '0';
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				*dst++ = '0';
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			}
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			goto done;
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		}
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	}
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	if (((c & 0177) == ' ') || (flag & VIS_OCTAL) ||
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	    ((flag & VIS_GLOB) && (c == '*' || c == '?' || c == '[' || c == '#'))) {
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		*dst++ = '\\';
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		*dst++ = ((u_char)c >> 6 & 07) + '0';
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		*dst++ = ((u_char)c >> 3 & 07) + '0';
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		*dst++ = ((u_char)c & 07) + '0';
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		goto done;
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	}
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	if ((flag & VIS_NOSLASH) == 0)
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		*dst++ = '\\';
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	if (c & 0200) {
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		c &= 0177;
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		*dst++ = 'M';
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	}
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	if (iscntrl((u_char)c)) {
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		*dst++ = '^';
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		if (c == 0177)
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			*dst++ = '?';
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		else
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			*dst++ = c + '@';
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	} else {
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		*dst++ = '-';
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		*dst++ = c;
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	}
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done:
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	*dst = '\0';
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	return (dst);
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}
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DEF_WEAK(vis);
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/*
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 * strvis, strnvis, strvisx - visually encode characters from src into dst
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 *
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 *	Dst must be 4 times the size of src to account for possible
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 *	expansion.  The length of dst, not including the trailing NULL,
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 *	is returned.
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 *
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 *	Strnvis will write no more than siz-1 bytes (and will NULL terminate).
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 *	The number of bytes needed to fully encode the string is returned.
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 *
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 *	Strvisx encodes exactly len bytes from src into dst.
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 *	This is useful for encoding a block of data.
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 */
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int
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strvis(char *dst, const char *src, int flag)
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{
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	char c;
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	char *start;
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	for (start = dst; (c = *src);)
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		dst = vis(dst, c, flag, *++src);
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	*dst = '\0';
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	return (dst - start);
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}
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DEF_WEAK(strvis);
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int
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strnvis(char *dst, const char *src, size_t siz, int flag)
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{
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	char *start, *end;
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	char tbuf[5];
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	int c, i;
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	i = 0;
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	for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
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		if (isvisible(c, flag)) {
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			if ((c == '"' && (flag & VIS_DQ) != 0) ||
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			    (c == '\\' && (flag & VIS_NOSLASH) == 0)) {
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				/* need space for the extra '\\' */
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				if (dst + 1 >= end) {
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					i = 2;
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					break;
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				}
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				*dst++ = '\\';
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			}
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			i = 1;
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			*dst++ = c;
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			src++;
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		} else {
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			i = vis(tbuf, c, flag, *++src) - tbuf;
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			if (dst + i <= end) {
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				memcpy(dst, tbuf, i);
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				dst += i;
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			} else {
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				src--;
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				break;
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			}
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		}
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	}
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	if (siz > 0)
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		*dst = '\0';
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	if (dst + i > end) {
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		/* adjust return value for truncation */
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		while ((c = *src))
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			dst += vis(tbuf, c, flag, *++src) - tbuf;
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	}
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	return (dst - start);
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}
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int
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stravis(char **outp, const char *src, int flag)
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{
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	char *buf;
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	int len, serrno;
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	buf = reallocarray(NULL, 4, strlen(src) + 1);
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	if (buf == NULL)
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		return -1;
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	len = strvis(buf, src, flag);
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	serrno = errno;
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	*outp = realloc(buf, len + 1);
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	if (*outp == NULL) {
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		*outp = buf;
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		errno = serrno;
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	}
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	return (len);
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}
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int
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strvisx(char *dst, const char *src, size_t len, int flag)
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{
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	char c;
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	char *start;
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	for (start = dst; len > 1; len--) {
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		c = *src;
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		dst = vis(dst, c, flag, *++src);
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	}
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	if (len)
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		dst = vis(dst, *src, flag, '\0');
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	*dst = '\0';
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	return (dst - start);
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}