11.3Smaya/* $NetBSD: nan.c,v 1.3 2017/03/07 11:15:08 maya Exp $ */ 21.1Skleink 31.1Skleink/*- 41.1Skleink * Copyright (c) 2006 The NetBSD Foundation, Inc. 51.1Skleink * All rights reserved. 61.1Skleink * 71.1Skleink * This code is derived from software contributed to The NetBSD Foundation 81.1Skleink * by Klaus Klein. 91.1Skleink * 101.1Skleink * Redistribution and use in source and binary forms, with or without 111.1Skleink * modification, are permitted provided that the following conditions 121.1Skleink * are met: 131.1Skleink * 1. Redistributions of source code must retain the above copyright 141.1Skleink * notice, this list of conditions and the following disclaimer. 151.1Skleink * 2. Redistributions in binary form must reproduce the above copyright 161.1Skleink * notice, this list of conditions and the following disclaimer in the 171.1Skleink * documentation and/or other materials provided with the distribution. 181.1Skleink * 191.1Skleink * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Skleink * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Skleink * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Skleink * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Skleink * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Skleink * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Skleink * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Skleink * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Skleink * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Skleink * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Skleink * POSSIBILITY OF SUCH DAMAGE. 301.1Skleink */ 311.1Skleink 321.1Skleink#include <sys/cdefs.h> 331.1Skleink#if defined(LIBM_SCCS) && !defined(lint) && !defined(NAN_FUNCTION) 341.3Smaya__RCSID("$NetBSD: nan.c,v 1.3 2017/03/07 11:15:08 maya Exp $"); 351.1Skleink#endif /* LIBM_SCCS and not lint */ 361.1Skleink 371.1Skleink#include <assert.h> 381.1Skleink#include <math.h> 391.1Skleink#include <stddef.h> 401.1Skleink#include <stdlib.h> 411.1Skleink#include <string.h> 421.1Skleink 431.1Skleink 441.1Skleink#ifndef NAN_FUNCTION 451.1Skleink#define NAN_FUNCTION nan 461.1Skleink#define NAN_TYPE double 471.1Skleink#define NAN_STRTOD strtod 481.1Skleink#endif 491.1Skleink 501.1SkleinkNAN_TYPE 511.1SkleinkNAN_FUNCTION(const char *tagp) 521.1Skleink{ 531.1Skleink const char *nstr; 541.1Skleink char *buf; 551.1Skleink NAN_TYPE res; 561.1Skleink 571.1Skleink _DIAGASSERT(tagp != NULL); 581.1Skleink 591.1Skleink nstr = "NAN()"; 601.1Skleink buf = NULL; 611.1Skleink 621.1Skleink if (tagp[0] != '\0') { 631.1Skleink size_t l; 641.1Skleink 651.1Skleink l = strlen(tagp); 661.1Skleink buf = malloc(5 + l + 1); 671.1Skleink 681.1Skleink if (buf != NULL) { 691.1Skleink /* Avoiding stdio in libm. */ 701.1Skleink memcpy(buf, "NAN(", 4); 711.1Skleink memcpy(buf + 4, tagp, l); 721.1Skleink memcpy(buf + 4 + l, ")", 2); 731.1Skleink nstr = buf; 741.1Skleink } else { 751.1Skleink /* Best effort: Fall back to "NAN()". */ 761.1Skleink } 771.1Skleink } 781.1Skleink 791.1Skleink res = NAN_STRTOD(nstr, NULL); 801.1Skleink 811.3Smaya free(buf); 821.1Skleink 831.1Skleink return res; 841.1Skleink} 85