1/* $NetBSD: strtof_vaxf.c,v 1.5 2008/03/28 00:56:54 he Exp $ */ 2 3/**************************************************************** 4 5The author of this software is David M. Gay. 6 7Copyright (C) 1998, 2000 by Lucent Technologies 8All Rights Reserved 9 10Permission to use, copy, modify, and distribute this software and 11its documentation for any purpose and without fee is hereby 12granted, provided that the above copyright notice appear in all 13copies and that both that the copyright notice and this 14permission notice and warranty disclaimer appear in supporting 15documentation, and that the name of Lucent or any of its entities 16not be used in advertising or publicity pertaining to 17distribution of the software without specific, written prior 18permission. 19 20LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 21INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 22IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 23SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 24WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 25IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 26ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 27THIS SOFTWARE. 28 29****************************************************************/ 30 31/* Please send bug reports to David M. Gay (dmg at acm dot org, 32 * with " at " changed at "@" and " dot " changed to "."). */ 33 34/* Adapted to VAX F_floating by Klaus Klein <kleink@netbsd.org>. */ 35 36#include "namespace.h" 37#include "gdtoaimp.h" 38 39#ifdef __weak_alias 40__weak_alias(strtof, _strtof) 41#endif 42 43 float 44#ifdef KR_headers 45strtof(s, sp) CONST char *s; char **sp; 46#else 47strtof(CONST char *s, char **sp) 48#endif 49{ 50 static CONST FPI fpi = { 24, 1-128-1-24+1, 255-128-1-24+1, 1, SI }; 51 ULong bits[1]; 52 Long expt; 53 int k; 54 union { ULong L[1]; float f; } u; 55 56 k = strtodg(s, sp, &fpi, &expt, bits); 57 if (k == STRTOG_NoMemory) { 58 errno = ERANGE; 59 return HUGE_VALF; 60 } 61 switch(k & STRTOG_Retmask) { 62 case STRTOG_NoNumber: 63 case STRTOG_Zero: 64 default: 65 u.f = 0.0; 66 break; 67 68 case STRTOG_Normal: 69 u.L[0] = ((bits[0] & 0x0000ffff) << 16) | /* FracLo */ 70 ((bits[0] & 0x007f0000) >> 16) | /* FracHi */ 71 ((expt + 128 + 1 + 23) << 7); /* Exp */ 72 break; 73 74 case STRTOG_Infinite: 75 u.f = HUGE_VALF; 76 break; 77 78 } 79 if (k & STRTOG_Neg) 80 u.L[0] |= 0x00008000L; 81 return u.f; 82} 83