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author | das <das@FreeBSD.org> | 2003-03-12 20:18:32 +0000 |
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committer | das <das@FreeBSD.org> | 2003-03-12 20:18:32 +0000 |
commit | db3a0f1435efcb4461005cb8d8509bff01f9b018 (patch) | |
tree | 632bc138392cfc4c37a7e12065afe443d31145eb /contrib/gdtoa/strtorQ.c | |
download | FreeBSD-src-db3a0f1435efcb4461005cb8d8509bff01f9b018.zip FreeBSD-src-db3a0f1435efcb4461005cb8d8509bff01f9b018.tar.gz |
Initial import of David Gay's gdtoa library for conversion between
strings and floating point.
Diffstat (limited to 'contrib/gdtoa/strtorQ.c')
-rw-r--r-- | contrib/gdtoa/strtorQ.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/contrib/gdtoa/strtorQ.c b/contrib/gdtoa/strtorQ.c new file mode 100644 index 0000000..63a7b6a --- /dev/null +++ b/contrib/gdtoa/strtorQ.c @@ -0,0 +1,121 @@ +/**************************************************************** + +The author of this software is David M. Gay. + +Copyright (C) 1998, 2000 by Lucent Technologies +All Rights Reserved + +Permission to use, copy, modify, and distribute this software and +its documentation for any purpose and without fee is hereby +granted, provided that the above copyright notice appear in all +copies and that both that the copyright notice and this +permission notice and warranty disclaimer appear in supporting +documentation, and that the name of Lucent or any of its entities +not be used in advertising or publicity pertaining to +distribution of the software without specific, written prior +permission. + +LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, +INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. +IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY +SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER +IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF +THIS SOFTWARE. + +****************************************************************/ + +/* Please send bug reports to + David M. Gay + Bell Laboratories, Room 2C-463 + 600 Mountain Avenue + Murray Hill, NJ 07974-0636 + U.S.A. + dmg@bell-labs.com + */ + +#include "gdtoaimp.h" + +#undef _0 +#undef _1 + +/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */ + +#ifdef IEEE_MC68k +#define _0 0 +#define _1 1 +#define _2 2 +#define _3 3 +#endif +#ifdef IEEE_8087 +#define _0 3 +#define _1 2 +#define _2 1 +#define _3 0 +#endif + + void +#ifdef KR_headers +ULtoQ(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k; +#else +ULtoQ(ULong *L, ULong *bits, Long exp, int k) +#endif +{ + switch(k & STRTOG_Retmask) { + case STRTOG_NoNumber: + case STRTOG_Zero: + L[0] = L[1] = L[2] = L[3] = 0; + break; + + case STRTOG_Normal: + case STRTOG_NaNbits: + L[_3] = bits[0]; + L[_2] = bits[1]; + L[_1] = bits[2]; + L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16); + break; + + case STRTOG_Denormal: + L[_3] = bits[0]; + L[_2] = bits[1]; + L[_1] = bits[2]; + L[_0] = bits[3]; + break; + + case STRTOG_Infinite: + L[_0] = 0x7fff0000; + L[_1] = L[_2] = L[_3] = 0; + break; + + case STRTOG_NaN: + L[_0] = 0x7fffffff; + L[_1] = L[_2] = L[_3] = (ULong)-1; + } + if (k & STRTOG_Neg) + L[_0] |= 0x80000000L; + } + + int +#ifdef KR_headers +strtorQ(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L; +#else +strtorQ(CONST char *s, char **sp, int rounding, void *L) +#endif +{ + static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI }; + FPI *fpi, fpi1; + ULong bits[4]; + Long exp; + int k; + + fpi = &fpi0; + if (rounding != FPI_Round_near) { + fpi1 = fpi0; + fpi1.rounding = rounding; + fpi = &fpi1; + } + k = strtodg(s, sp, fpi, &exp, bits); + ULtoQ((ULong*)L, bits, exp, k); + return k; + } |