86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
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/* $NetBSD: nan.c,v 1.2 2008/04/28 20:23:01 martin Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint) && !defined(NAN_FUNCTION)
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__RCSID("$NetBSD: nan.c,v 1.2 2008/04/28 20:23:01 martin Exp $");
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#endif /* LIBM_SCCS and not lint */
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#include <assert.h>
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#include <math.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef NAN_FUNCTION
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#define NAN_FUNCTION nan
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#define NAN_TYPE double
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#define NAN_STRTOD strtod
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#endif
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NAN_TYPE
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NAN_FUNCTION(const char *tagp)
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{
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const char *nstr;
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char *buf;
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NAN_TYPE res;
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_DIAGASSERT(tagp != NULL);
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nstr = "NAN()";
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buf = NULL;
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if (tagp[0] != '\0') {
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size_t l;
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l = strlen(tagp);
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buf = malloc(5 + l + 1);
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if (buf != NULL) {
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/* Avoiding stdio in libm. */
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memcpy(buf, "NAN(", 4);
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memcpy(buf + 4, tagp, l);
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memcpy(buf + 4 + l, ")", 2);
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nstr = buf;
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} else {
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/* Best effort: Fall back to "NAN()". */
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}
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}
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res = NAN_STRTOD(nstr, NULL);
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if (buf != NULL)
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free(buf);
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return res;
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}
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