Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/gen/vis.c	Lines:	77	105	73.3 %
Date:	2017-11-07	Branches:	58	124	46.8 %


/*	$OpenBSD: vis.c,v 1.25 2015/09/13 11:32:51 guenther Exp $ */
/*-
 * 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. 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.
 */

#include <sys/types.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <vis.h>

#define	isoctal(c)	(((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define	isvisible(c,flag)						\
	(((c) == '\\' || (flag & VIS_ALL) == 0) &&			\
	(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) &&		\
	(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') ||	\
		(flag & VIS_GLOB) == 0) && isgraph((u_char)(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' ||				\
		isgraph((u_char)(c))))))

/*
 * vis - visually encode characters
 */
char *
vis(char *dst, int c, int flag, int nextc)
{
	if (isvisible(c, flag)) {
		if ((c == '"' && (flag & VIS_DQ) != 0) ||
		    (c == '\\' && (flag & VIS_NOSLASH) == 0))
			*dst++ = '\\';
		*dst++ = c;
		*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;
		case '\a':
			*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) ||
	    ((flag & VIS_GLOB) && (c == '*' || c == '?' || c == '[' || c == '#'))) {
		*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((u_char)c)) {
		*dst++ = '^';
		if (c == 0177)
			*dst++ = '?';
		else
			*dst++ = c + '@';
	} else {
		*dst++ = '-';
		*dst++ = c;
	}
done:
	*dst = '\0';
	return (dst);
}
DEF_WEAK(vis);

/*
 * strvis, strnvis, 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.
 *
 *	Strnvis will write no more than siz-1 bytes (and will NULL terminate).
 *	The number of bytes needed to fully encode the string is returned.
 *
 *	Strvisx encodes exactly len bytes from src into dst.
 *	This is useful for encoding a block of data.
 */
int
strvis(char *dst, const char *src, int flag)
{
	char c;
	char *start;

	for (start = dst; (c = *src);)
		dst = vis(dst, c, flag, *++src);
	*dst = '\0';
	return (dst - start);
}
DEF_WEAK(strvis);

int
strnvis(char *dst, const char *src, size_t siz, int flag)
{
	char *start, *end;
	char tbuf[5];
	int c, i;

	i = 0;
	for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
		if (isvisible(c, flag)) {
			if ((c == '"' && (flag & VIS_DQ) != 0) ||
			    (c == '\\' && (flag & VIS_NOSLASH) == 0)) {
				/* need space for the extra '\\' */
				if (dst + 1 >= end) {
					i = 2;
					break;
				}
				*dst++ = '\\';
			}
			i = 1;
			*dst++ = c;
			src++;
		} else {
			i = vis(tbuf, c, flag, *++src) - tbuf;
			if (dst + i <= end) {
				memcpy(dst, tbuf, i);
				dst += i;
			} else {
				src--;
				break;
			}
		}
	}
	if (siz > 0)
		*dst = '\0';
	if (dst + i > end) {
		/* adjust return value for truncation */
		while ((c = *src))
			dst += vis(tbuf, c, flag, *++src) - tbuf;
	}
	return (dst - start);
}

int
stravis(char **outp, const char *src, int flag)
{
	char *buf;
	int len, serrno;

	buf = reallocarray(NULL, 4, strlen(src) + 1);
	if (buf == NULL)
		return -1;
	len = strvis(buf, src, flag);
	serrno = errno;
	*outp = realloc(buf, len + 1);
	if (*outp == NULL) {
		*outp = buf;
		errno = serrno;
	}
	return (len);
}

int
strvisx(char *dst, const char *src, size_t len, int flag)
{
	char 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);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: vis.c,v 1.25 2015/09/13 11:32:51 guenther Exp $ */
2			/*-
3			* Copyright (c) 1989, 1993
4			* The Regents of the University of California. All rights reserved.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions
8			* are met:
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			* 2. Redistributions in binary form must reproduce the above copyright
12			* notice, this list of conditions and the following disclaimer in the
13			* documentation and/or other materials provided with the distribution.
14			* 3. Neither the name of the University nor the names of its contributors
15			* may be used to endorse or promote products derived from this software
16			* without specific prior written permission.
17			*
18			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28			* SUCH DAMAGE.
29			*/
30
31			#include <sys/types.h>
32			#include <errno.h>
33			#include <ctype.h>
34			#include <limits.h>
35			#include <string.h>
36			#include <stdlib.h>
37			#include <vis.h>
38
39			#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
40			#define isvisible(c,flag) \
41			(((c) == '\\' \|\| (flag & VIS_ALL) == 0) && \
42			(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
43			(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') \|\| \
44			(flag & VIS_GLOB) == 0) && isgraph((u_char)(c))) \|\| \
45			((flag & VIS_SP) == 0 && (c) == ' ') \|\| \
46			((flag & VIS_TAB) == 0 && (c) == '\t') \|\| \
47			((flag & VIS_NL) == 0 && (c) == '\n') \|\| \
48			((flag & VIS_SAFE) && ((c) == '\b' \|\| \
49			(c) == '\007' \|\| (c) == '\r' \|\| \
50			isgraph((u_char)(c))))))
51
52			/*
53			* vis - visually encode characters
54			*/
55			char *
56			vis(char *dst, int c, int flag, int nextc)
57			{
58	✓✓✓✗ ✓✓✓✓ ✓✓✓✗ ✓✓✓✓ ✓✓✓✓ ✗✓✗✗ ✗✗	389798027	if (isvisible(c, flag)) {
59	✓✓✓✗ ✓✗	38380723	if ((c == '"' && (flag & VIS_DQ) != 0) \|\|
60	✓✓	38355943	(c == '\\' && (flag & VIS_NOSLASH) == 0))
61		13784	*dst++ = '\\';
62		38342159	*dst++ = c;
63		38342159	*dst = '\0';
64		38342159	return (dst);
65			}
66
67	✓✗	11449278	if (flag & VIS_CSTYLE) {
68	✓✓✓✓ ✓✓✓✗ ✓✓	11449278	switch(c) {
69			case '\n':
70		10	*dst++ = '\\';
71		10	*dst++ = 'n';
72		10	goto done;
73			case '\r':
74		15074	*dst++ = '\\';
75		15074	*dst++ = 'r';
76		15074	goto done;
77			case '\b':
78		35190	*dst++ = '\\';
79		35190	*dst++ = 'b';
80		35190	goto done;
81			case '\a':
82		21777	*dst++ = '\\';
83		21777	*dst++ = 'a';
84		21777	goto done;
85			case '\v':
86		20037	*dst++ = '\\';
87		20037	*dst++ = 'v';
88		20037	goto done;
89			case '\t':
90		10	*dst++ = '\\';
91		10	*dst++ = 't';
92		10	goto done;
93			case '\f':
94		18181	*dst++ = '\\';
95		18181	*dst++ = 'f';
96		18181	goto done;
97			case ' ':
98			*dst++ = '\\';
99			*dst++ = 's';
100			goto done;
101			case '\0':
102		7199215	*dst++ = '\\';
103		7199215	*dst++ = '0';
104	✓✓✓✓	7908275	if (isoctal(nextc)) {
105		38867	*dst++ = '0';
106		38867	*dst++ = '0';
107		38867	}
108			goto done;
109			}
110			}
111	✓✓✓✗	8241412	if (((c & 0177) == ' ') \|\| (flag & VIS_OCTAL) \|\|
112	✗✓✗✗	4101628	((flag & VIS_GLOB) && (c == '*' \|\| c == '?' \|\| c == '[' \|\| c == '#'))) {
113		38156	*dst++ = '\\';
114		38156	*dst++ = ((u_char)c >> 6 & 07) + '0';
115		38156	*dst++ = ((u_char)c >> 3 & 07) + '0';
116		38156	*dst++ = ((u_char)c & 07) + '0';
117		38156	goto done;
118			}
119	✓✗	4101628	if ((flag & VIS_NOSLASH) == 0)
120		4101628	*dst++ = '\\';
121	✓✓	4101628	if (c & 0200) {
122			c &= 0177;
123		3491867	*dst++ = 'M';
124		3491867	}
125	✓✓	4101628	if (iscntrl((u_char)c)) {
126		2946697	*dst++ = '^';
127	✓✓	2946697	if (c == 0177)
128		1950476	*dst++ = '?';
129			else
130		996221	*dst++ = c + '@';
131			} else {
132		1154931	*dst++ = '-';
133		1154931	*dst++ = c;
134			}
135			done:
136		11449278	*dst = '\0';
137		11449278	return (dst);
138		49791437	}
139			DEF_WEAK(vis);
140
141			/*
142			* strvis, strnvis, strvisx - visually encode characters from src into dst
143			*
144			* Dst must be 4 times the size of src to account for possible
145			* expansion. The length of dst, not including the trailing NULL,
146			* is returned.
147			*
148			* Strnvis will write no more than siz-1 bytes (and will NULL terminate).
149			* The number of bytes needed to fully encode the string is returned.
150			*
151			* Strvisx encodes exactly len bytes from src into dst.
152			* This is useful for encoding a block of data.
153			*/
154			int
155			strvis(char dst, const char src, int flag)
156			{
157			char c;
158			char *start;
159
160	✓✓	35450	for (start = dst; (c = *src);)
161		15730	dst = vis(dst, c, flag, *++src);
162		1330	*dst = '\0';
163		1330	return (dst - start);
164			}
165			DEF_WEAK(strvis);
166
167			int
168			strnvis(char dst, const char src, size_t siz, int flag)
169			{
170			char start, end;
171			char tbuf[5];
172			int c, i;
173
174			i = 0;
175			for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
176			if (isvisible(c, flag)) {
177			if ((c == '"' && (flag & VIS_DQ) != 0) \|\|
178			(c == '\\' && (flag & VIS_NOSLASH) == 0)) {
179			/* need space for the extra '\\' */
180			if (dst + 1 >= end) {
181			i = 2;
182			break;
183			}
184			*dst++ = '\\';
185			}
186			i = 1;
187			*dst++ = c;
188			src++;
189			} else {
190			i = vis(tbuf, c, flag, *++src) - tbuf;
191			if (dst + i <= end) {
192			memcpy(dst, tbuf, i);
193			dst += i;
194			} else {
195			src--;
196			break;
197			}
198			}
199			}
200			if (siz > 0)
201			*dst = '\0';
202			if (dst + i > end) {
203			/* adjust return value for truncation */
204			while ((c = *src))
205			dst += vis(tbuf, c, flag, *++src) - tbuf;
206			}
207			return (dst - start);
208			}
209
210			int
211			stravis(char *outp, const char src, int flag)
212			{
213			char *buf;
214			int len, serrno;
215
216		2660	buf = reallocarray(NULL, 4, strlen(src) + 1);
217	✗✓	1330	if (buf == NULL)
218			return -1;
219		1330	len = strvis(buf, src, flag);
220		1330	serrno = errno;
221		1330	*outp = realloc(buf, len + 1);
222	✗✓	1330	if (*outp == NULL) {
223			*outp = buf;
224			errno = serrno;
225			}
226		1330	return (len);
227		1330	}
228
229			int
230			strvisx(char dst, const char src, size_t len, int flag)
231			{
232			char c;
233			char *start;
234
235	✓✓	4703	for (start = dst; len > 1; len--) {
236		1708	c = *src;
237		1708	dst = vis(dst, c, flag, *++src);
238			}
239	✓✓	429	if (len)
240		244	dst = vis(dst, *src, flag, '\0');
241		429	*dst = '\0';
242		429	return (dst - start);
243			}