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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libm/src/s_nan.c	Lines:	0	20	0.0 %
Date:	2017-11-13	Branches:	0	16	0.0 %


/*	$OpenBSD: s_nan.c,v 1.14 2016/09/12 19:47:02 guenther Exp $	*/
/*-
 * Copyright (c) 2007 David Schultz
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/lib/msun/src/s_nan.c,v 1.2 2007/12/18 23:46:32 das Exp $
 */

#include <sys/types.h>
#include <ctype.h>
#include <endian.h>
#include <float.h>
#include <math.h>
#include <stdint.h>
#include <strings.h>

#include "math_private.h"

/*
 * OpenBSD's ctype doesn't have digittoint, so we define it here.
 */
static int
_digittoint(int c)
{
	if (!isxdigit(c))
		return 0;

	if (isdigit(c))
		return c - '0';
	else
		return isupper(c) ? c - 'A' + 10 : c - 'a' + 10;
}

/*
 * Scan a string of hexadecimal digits (the format nan(3) expects) and
 * make a bit array (using the local endianness). We stop when we
 * encounter an invalid character, NUL, etc.  If we overflow, we do
 * the same as gcc's __builtin_nan(), namely, discard the high order bits.
 *
 * The format this routine accepts needs to be compatible with what is used
 * in contrib/gdtoa/hexnan.c (for strtod/scanf) and what is used in
 * __builtin_nan(). In fact, we're only 100% compatible for strings we
 * consider valid, so we might be violating the C standard. But it's
 * impossible to use nan(3) portably anyway, so this seems good enough.
 */
void
_scan_nan(uint32_t *words, int num_words, const char *s)
{
	int si;		/* index into s */
	int bitpos;	/* index into words (in bits) */

	bzero(words, num_words * sizeof(uint32_t));

	/* Allow a leading '0x'. (It's expected, but redundant.) */
	if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
		s += 2;

	/* Scan forwards in the string, looking for the end of the sequence. */
	for (si = 0; isxdigit((unsigned char)s[si]); si++)
		;

	/* Scan backwards, filling in the bits in words[] as we go. */
#if BYTE_ORDER == LITTLE_ENDIAN
	for (bitpos = 0; bitpos < 32 * num_words; bitpos += 4) {
#else
	for (bitpos = 32 * num_words - 4; bitpos >= 0; bitpos -= 4) {
#endif
		if (--si < 0)
			break;
		words[bitpos / 32] |= _digittoint((unsigned char)s[si]) << (bitpos % 32);
	}
}

double
nan(const char *s)
{
	union {
		double d;
		uint32_t bits[2];
	} u;

	_scan_nan(u.bits, 2, s);
#if BYTE_ORDER == LITTLE_ENDIAN
	u.bits[1] |= 0x7ff80000;
#else
	u.bits[0] |= 0x7ff80000;
#endif
	return (u.d);
}
DEF_STD(nan);
LDBL_MAYBE_UNUSED_CLONE(nan);

float
nanf(const char *s)
{
	union {
		float f;
		uint32_t bits[1];
	} u;

	_scan_nan(u.bits, 1, s);
	u.bits[0] |= 0x7fc00000;
	return (u.f);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: s_nan.c,v 1.14 2016/09/12 19:47:02 guenther Exp $ */
2			/*-
3			* Copyright (c) 2007 David Schultz
4			* 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			*
15			* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18			* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25			* SUCH DAMAGE.
26			*
27			* $FreeBSD: src/lib/msun/src/s_nan.c,v 1.2 2007/12/18 23:46:32 das Exp $
28			*/
29
30			#include <sys/types.h>
31			#include <ctype.h>
32			#include <endian.h>
33			#include <float.h>
34			#include <math.h>
35			#include <stdint.h>
36			#include <strings.h>
37
38			#include "math_private.h"
39
40			/*
41			* OpenBSD's ctype doesn't have digittoint, so we define it here.
42			*/
43			static int
44			_digittoint(int c)
45			{
46			if (!isxdigit(c))
47			return 0;
48
49			if (isdigit(c))
50			return c - '0';
51			else
52			return isupper(c) ? c - 'A' + 10 : c - 'a' + 10;
53			}
54
55			/*
56			* Scan a string of hexadecimal digits (the format nan(3) expects) and
57			* make a bit array (using the local endianness). We stop when we
58			* encounter an invalid character, NUL, etc. If we overflow, we do
59			* the same as gcc's __builtin_nan(), namely, discard the high order bits.
60			*
61			* The format this routine accepts needs to be compatible with what is used
62			* in contrib/gdtoa/hexnan.c (for strtod/scanf) and what is used in
63			* __builtin_nan(). In fact, we're only 100% compatible for strings we
64			* consider valid, so we might be violating the C standard. But it's
65			* impossible to use nan(3) portably anyway, so this seems good enough.
66			*/
67			void
68			_scan_nan(uint32_t words, int num_words, const char s)
69			{
70			int si; /* index into s */
71			int bitpos; /* index into words (in bits) */
72
73			bzero(words, num_words * sizeof(uint32_t));
74
75			/* Allow a leading '0x'. (It's expected, but redundant.) */
76			if (s[0] == '0' && (s[1] == 'x' \|\| s[1] == 'X'))
77			s += 2;
78
79			/* Scan forwards in the string, looking for the end of the sequence. */
80			for (si = 0; isxdigit((unsigned char)s[si]); si++)
81			;
82
83			/* Scan backwards, filling in the bits in words[] as we go. */
84			#if BYTE_ORDER == LITTLE_ENDIAN
85			for (bitpos = 0; bitpos < 32 * num_words; bitpos += 4) {
86			#else
87			for (bitpos = 32 * num_words - 4; bitpos >= 0; bitpos -= 4) {
88			#endif
89			if (--si < 0)
90			break;
91			words[bitpos / 32] \|= _digittoint((unsigned char)s[si]) << (bitpos % 32);
92			}
93			}
94
95			double
96			nan(const char *s)
97			{
98			union {
99			double d;
100			uint32_t bits[2];
101			} u;
102
103			_scan_nan(u.bits, 2, s);
104			#if BYTE_ORDER == LITTLE_ENDIAN
105			u.bits[1] \|= 0x7ff80000;
106			#else
107			u.bits[0] \|= 0x7ff80000;
108			#endif
109			return (u.d);
110			}
111			DEF_STD(nan);
112			LDBL_MAYBE_UNUSED_CLONE(nan);
113
114			float
115			nanf(const char *s)
116			{
117			union {
118			float f;
119			uint32_t bits[1];
120			} u;
121
122			_scan_nan(u.bits, 1, s);
123			u.bits[0] \|= 0x7fc00000;
124			return (u.f);
125			}