Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/stdio/fread.c	Lines:	21	31	67.7 %
Date:	2017-11-07	Branches:	15	32	46.9 %


/*	$OpenBSD: fread.c,v 1.15 2016/09/21 04:38:56 guenther Exp $ */
/*-
 * Copyright (c) 1990, 1993
 *	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 <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include "local.h"

#define MUL_NO_OVERFLOW	(1UL << (sizeof(size_t) * 4))

size_t
fread(void *buf, size_t size, size_t count, FILE *fp)
{
	size_t resid;
	char *p;
	int r;
	size_t total;

	/*
	 * Extension:  Catch integer overflow
	 */
	if ((size >= MUL_NO_OVERFLOW || count >= MUL_NO_OVERFLOW) &&
	    size > 0 && SIZE_MAX / size < count) {
		errno = EOVERFLOW;
		fp->_flags |= __SERR;
		return (0);
	}

	/*
	 * ANSI and SUSv2 require a return value of 0 if size or count are 0.
	 */
	if ((resid = count * size) == 0)
		return (0);
	FLOCKFILE(fp);
	_SET_ORIENTATION(fp, -1);
	if (fp->_r < 0)
		fp->_r = 0;
	total = resid;
	p = buf;

	if ((fp->_flags & __SNBF) != 0) {
		/*
		 * We know if we're unbuffered that our buffer is empty, so
		 * we can just read directly. This is much faster than the
		 * loop below which will perform a series of one byte reads.
		 */
		while (resid > 0 && (r = (*fp->_read)(fp->_cookie, p, resid)) > 0) {
			p += r;
			resid -= r;
		}
		FUNLOCKFILE(fp);
		return ((total - resid) / size);
	}

	while (resid > (r = fp->_r)) {
		(void)memcpy(p, fp->_p, r);
		fp->_p += r;
		/* fp->_r = 0 ... done in __srefill */
		p += r;
		resid -= r;
		if (__srefill(fp)) {
			/* no more input: return partial result */
			FUNLOCKFILE(fp);
			return ((total - resid) / size);
		}
	}
	(void)memcpy(p, fp->_p, resid);
	fp->_r -= resid;
	fp->_p += resid;
	FUNLOCKFILE(fp);
	return (count);
}
DEF_STRONG(fread);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: fread.c,v 1.15 2016/09/21 04:38:56 guenther Exp $ */
2			/*-
3			* Copyright (c) 1990, 1993
4			* The Regents of the University of California. 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 <stdio.h>
35			#include <string.h>
36			#include <stdint.h>
37			#include <errno.h>
38			#include "local.h"
39
40			#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
41
42			size_t
43			fread(void buf, size_t size, size_t count, FILE fp)
44			{
45			size_t resid;
46			char *p;
47			int r;
48			size_t total;
49
50			/*
51			* Extension: Catch integer overflow
52			*/
53	✗✓✗✗	30672996	if ((size >= MUL_NO_OVERFLOW \|\| count >= MUL_NO_OVERFLOW) &&
54		10224332	size > 0 && SIZE_MAX / size < count) {
55			errno = EOVERFLOW;
56			fp->_flags \|= __SERR;
57			return (0);
58			}
59
60			/*
61			* ANSI and SUSv2 require a return value of 0 if size or count are 0.
62			*/
63	✗✓	10224332	if ((resid = count * size) == 0)
64			return (0);
65	✗✓	10224332	FLOCKFILE(fp);
66	✓✗✓✗ ✓✓	40897582	_SET_ORIENTATION(fp, -1);
67	✗✓	10224332	if (fp->_r < 0)
68			fp->_r = 0;
69			total = resid;
70			p = buf;
71
72	✗✓	10224332	if ((fp->_flags & __SNBF) != 0) {
73			/*
74			* We know if we're unbuffered that our buffer is empty, so
75			* we can just read directly. This is much faster than the
76			* loop below which will perform a series of one byte reads.
77			*/
78			while (resid > 0 && (r = (*fp->_read)(fp->_cookie, p, resid)) > 0) {
79			p += r;
80			resid -= r;
81			}
82			FUNLOCKFILE(fp);
83			return ((total - resid) / size);
84			}
85
86	✓✓	10385150	while (resid > (r = fp->_r)) {
87		161052	(void)memcpy(p, fp->_p, r);
88		161052	fp->_p += r;
89			/* fp->_r = 0 ... done in __srefill */
90		161052	p += r;
91		161052	resid -= r;
92	✓✓	161052	if (__srefill(fp)) {
93			/* no more input: return partial result */
94	✗✓	234	FUNLOCKFILE(fp);
95		234	return ((total - resid) / size);
96			}
97			}
98		10224098	(void)memcpy(p, fp->_p, resid);
99		10224098	fp->_r -= resid;
100		10224098	fp->_p += resid;
101	✗✓	10224098	FUNLOCKFILE(fp);
102		10224098	return (count);
103		10224332	}
104			DEF_STRONG(fread);