0dc9e0996a
As the current libc includes a libm implementation, with the new libc this is needed. Unneeded (for the moment) archs have been removed.
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/* $NetBSD: nan.c,v 1.2 2008/04/28 20:23:01 martin Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2006 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Klaus Klein.
|
|
*
|
|
* 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 THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint) && !defined(NAN_FUNCTION)
|
|
__RCSID("$NetBSD: nan.c,v 1.2 2008/04/28 20:23:01 martin Exp $");
|
|
#endif /* LIBM_SCCS and not lint */
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
|
|
#ifndef NAN_FUNCTION
|
|
#define NAN_FUNCTION nan
|
|
#define NAN_TYPE double
|
|
#define NAN_STRTOD strtod
|
|
#endif
|
|
|
|
NAN_TYPE
|
|
NAN_FUNCTION(const char *tagp)
|
|
{
|
|
const char *nstr;
|
|
char *buf;
|
|
NAN_TYPE res;
|
|
|
|
_DIAGASSERT(tagp != NULL);
|
|
|
|
nstr = "NAN()";
|
|
buf = NULL;
|
|
|
|
if (tagp[0] != '\0') {
|
|
size_t l;
|
|
|
|
l = strlen(tagp);
|
|
buf = malloc(5 + l + 1);
|
|
|
|
if (buf != NULL) {
|
|
/* Avoiding stdio in libm. */
|
|
memcpy(buf, "NAN(", 4);
|
|
memcpy(buf + 4, tagp, l);
|
|
memcpy(buf + 4 + l, ")", 2);
|
|
nstr = buf;
|
|
} else {
|
|
/* Best effort: Fall back to "NAN()". */
|
|
}
|
|
}
|
|
|
|
res = NAN_STRTOD(nstr, NULL);
|
|
|
|
if (buf != NULL)
|
|
free(buf);
|
|
|
|
return res;
|
|
}
|