Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/string/memcpy.c	Lines:	15	21	71.4 %
Date:	2017-11-13	Branches:	23	26	88.5 %


/*	$OpenBSD: memcpy.c,v 1.3 2017/08/14 17:10:02 guenther Exp $ */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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 <string.h>
#include <stdlib.h>
#include <syslog.h>

/*
 * sizeof(word) MUST BE A POWER OF TWO
 * SO THAT wmask BELOW IS ALL ONES
 */
typedef	long word;		/* "word" used for optimal copy speed */

#define	wsize	sizeof(word)
#define	wmask	(wsize - 1)

static const char backwards_msg[] = ": backwards memcpy";

/*
 * Copy a block of memory, not handling overlap.
 */
void *
memcpy(void *dst0, const void *src0, size_t length)
{
	char *dst = dst0;
	const char *src = src0;
	size_t t;

	if (length == 0 || dst == src)		/* nothing to do */
		goto done;

	if ((dst < src && dst + length > src) ||
	    (src < dst && src + length > dst)) {
		char buf[1024];

		/* <10> is LOG_CRIT */
		strlcpy(buf, "<10>", sizeof buf);

		/* Make sure progname does not fill the whole buffer */
		strlcat(buf, __progname, sizeof(buf) - sizeof backwards_msg);
		strlcat(buf, backwards_msg, sizeof buf);

		sendsyslog(buf, strlen(buf), LOG_CONS);
		abort();
	}

	/*
	 * Macros: loop-t-times; and loop-t-times, t>0
	 */
#define	TLOOP(s) if (t) TLOOP1(s)
#define	TLOOP1(s) do { s; } while (--t)

	/*
	 * Copy forward.
	 */
	t = (long)src;	/* only need low bits */
	if ((t | (long)dst) & wmask) {
		/*
		 * Try to align operands.  This cannot be done
		 * unless the low bits match.
		 */
		if ((t ^ (long)dst) & wmask || length < wsize)
			t = length;
		else
			t = wsize - (t & wmask);
		length -= t;
		TLOOP1(*dst++ = *src++);
	}
	/*
	 * Copy whole words, then mop up any trailing bytes.
	 */
	t = length / wsize;
	TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize);
	t = length & wmask;
	TLOOP(*dst++ = *src++);
done:
	return (dst0);
}
DEF_STRONG(memcpy);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: memcpy.c,v 1.3 2017/08/14 17:10:02 guenther Exp $ */
2			/*-
3			* Copyright (c) 1990 The Regents of the University of California.
4			* All rights reserved.
5			*
6			* This code is derived from software contributed to Berkeley by
7			* Chris Torek.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in the
16			* documentation and/or other materials provided with the distribution.
17			* 3. Neither the name of the University nor the names of its contributors
18			* may be used to endorse or promote products derived from this software
19			* without specific prior written permission.
20			*
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31			* SUCH DAMAGE.
32			*/
33
34			#include <string.h>
35			#include <stdlib.h>
36			#include <syslog.h>
37
38			/*
39			* sizeof(word) MUST BE A POWER OF TWO
40			* SO THAT wmask BELOW IS ALL ONES
41			*/
42			typedef long word; /* "word" used for optimal copy speed */
43
44			#define wsize sizeof(word)
45			#define wmask (wsize - 1)
46
47			static const char backwards_msg[] = ": backwards memcpy";
48
49			/*
50			* Copy a block of memory, not handling overlap.
51			*/
52			void *
53			memcpy(void dst0, const void src0, size_t length)
54			{
55			char *dst = dst0;
56			const char *src = src0;
57			size_t t;
58
59	✓✓✓✗	13814457	if (length == 0 \|\| dst == src) /* nothing to do */
60			goto done;
61
62	✓✓✓✗ ✗✓	9209189	if ((dst < src && dst + length > src) \|\|
63	✓✓	4767831	(src < dst && src + length > dst)) {
64			char buf[1024];
65
66			/* <10> is LOG_CRIT */
67			strlcpy(buf, "<10>", sizeof buf);
68
69			/* Make sure progname does not fill the whole buffer */
70			strlcat(buf, __progname, sizeof(buf) - sizeof backwards_msg);
71			strlcat(buf, backwards_msg, sizeof buf);
72
73			sendsyslog(buf, strlen(buf), LOG_CONS);
74			abort();
75			}
76
77			/*
78			* Macros: loop-t-times; and loop-t-times, t>0
79			*/
80			#define TLOOP(s) if (t) TLOOP1(s)
81			#define TLOOP1(s) do { s; } while (--t)
82
83			/*
84			* Copy forward.
85			*/
86		4604707	t = (long)src; /* only need low bits */
87	✓✓	4604707	if ((t \| (long)dst) & wmask) {
88			/*
89			* Try to align operands. This cannot be done
90			* unless the low bits match.
91			*/
92	✓✓	4324073	if ((t ^ (long)dst) & wmask \|\| length < wsize)
93		4322755	t = length;
94			else
95		1318	t = wsize - (t & wmask);
96		4324073	length -= t;
97	✓✓	15084095	TLOOP1(dst++ = src++);
98			}
99			/*
100			* Copy whole words, then mop up any trailing bytes.
101			*/
102		4604827	t = length / wsize;
103	✓✓✓✓	5758467	TLOOP((word )dst = (word )src; src += wsize; dst += wsize);
104		4604917	t = length & wmask;
105	✓✓✓✓	5142806	TLOOP(dst++ = src++);
106			done:
107		4605415	return (dst0);
108			}
109			DEF_STRONG(memcpy);