84d9c625bf
- Fix for possible unset uid/gid in toproto - Fix for default mtree style - Update libelf - Importing libexecinfo - Resynchronize GCC, mpc, gmp, mpfr - build.sh: Replace params with show-params. This has been done as the make target has been renamed in the same way, while a new target named params has been added. This new target generates a file containing all the parameters, instead of printing it on the console. - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org) get getservbyport() out of the inner loop Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/* $NetBSD: s_nan.c,v 1.2 2013/02/09 20:19:13 christos 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/cdefs.h>
|
|
__RCSID("$NetBSD: s_nan.c,v 1.2 2013/02/09 20:19:13 christos Exp $");
|
|
|
|
#include <sys/endian.h>
|
|
#include <ctype.h>
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
/* XXX: Locale? not here? in <ctype.h>? */
|
|
static int
|
|
digittoint(char s) {
|
|
if (isdigit((unsigned char)s))
|
|
return s - '0';
|
|
if (islower((unsigned char)s))
|
|
return s - 'a' + 10;
|
|
return s - '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.
|
|
*/
|
|
static void
|
|
_scan_nan(uint32_t *words, int num_words, const char *s)
|
|
{
|
|
int si; /* index into s */
|
|
int bitpos; /* index into words (in bits) */
|
|
|
|
memset(words, 0, num_words * sizeof(*words));
|
|
|
|
/* 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++)
|
|
continue;
|
|
|
|
/* 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(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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#if (LDBL_MANT_DIG == 53)
|
|
__weak_reference(nan, nanl);
|
|
#endif
|