| 1 | /* $NetBSD: ldtoa.c,v 1.4.2.1 2007/05/07 19:49:06 pavel Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 2003 David Schultz <[email protected]>
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | */
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| 28 | #include <LibConfig.h>
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| 29 | #include <sys/EfiCdefs.h>
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| 30 |
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| 31 | #include <float.h>
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| 32 | #include <inttypes.h>
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| 33 | #include <limits.h>
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| 34 | #include <math.h>
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| 35 | #include <stdlib.h>
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| 36 | #include <machine/ieee.h>
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| 37 | #include "gdtoaimp.h"
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| 38 |
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| 39 | #if defined(_MSC_VER)
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| 40 | /* Disable warnings about conversions to narrower data types,
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| 41 | primarily for the fpclassify() macro.
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| 42 | */
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| 43 | #pragma warning ( disable : 4244 )
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| 44 | // Squelch bogus warnings about uninitialized variable use.
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| 45 | #pragma warning ( disable : 4700 )
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| 46 | #endif
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| 47 |
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| 48 | /*
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| 49 | * ldtoa() is a wrapper for gdtoa() that makes it smell like dtoa(),
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| 50 | * except that the floating point argument is passed by reference.
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| 51 | * When dtoa() is passed a NaN or infinity, it sets expt to 9999.
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| 52 | * However, a long double could have a valid exponent of 9999, so we
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| 53 | * use INT_MAX in ldtoa() instead.
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| 54 | */
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| 55 | char *
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| 56 | ldtoa(long double *ld, int mode, int ndigits, int *decpt, int *sign, char **rve)
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| 57 | {
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| 58 | #ifdef EXT_EXPBITS
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| 59 | static FPI fpi = {
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| 60 | LDBL_MANT_DIG, /* nbits */
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| 61 | LDBL_MIN_EXP - LDBL_MANT_DIG, /* emin */
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| 62 | LDBL_MAX_EXP - LDBL_MANT_DIG, /* emax */
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| 63 | FPI_Round_near, /* rounding */
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| 64 | #ifdef Sudden_Underflow /* unused, but correct anyway */
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| 65 | 1
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| 66 | #else
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| 67 | 0
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| 68 | #endif
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| 69 | };
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| 70 | int be, kind;
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| 71 | char *ret;
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| 72 | union ieee_ext_u u;
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| 73 | uint32_t bits[(LDBL_MANT_DIG + 31) / 32];
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| 74 |
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| 75 | u.extu_ld = *ld;
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| 76 | *sign = (int)(u.extu_ext.ext_sign);
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| 77 | be = (int)(u.extu_ext.ext_exp - (LDBL_MAX_EXP - 1) - (LDBL_MANT_DIG - 1));
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| 78 | EXT_TO_ARRAY32(u, bits);
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| 79 |
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| 80 | switch (fpclassify(u.extu_ld)) {
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| 81 | case FP_NORMAL:
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| 82 | kind = STRTOG_Normal;
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| 83 | #ifdef LDBL_IMPLICIT_NBIT
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| 84 | bits[LDBL_MANT_DIG / 32] |= 1 << ((LDBL_MANT_DIG - 1) % 32);
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| 85 | #endif /* LDBL_IMPLICIT_NBIT */
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| 86 | break;
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| 87 | case FP_ZERO:
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| 88 | kind = STRTOG_Zero;
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| 89 | break;
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| 90 | case FP_SUBNORMAL:
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| 91 | kind = STRTOG_Denormal;
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| 92 | #ifdef LDBL_IMPLICIT_NBIT
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| 93 | be++;
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| 94 | #endif
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| 95 | break;
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| 96 | case FP_INFINITE:
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| 97 | kind = STRTOG_Infinite;
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| 98 | break;
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| 99 | case FP_NAN:
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| 100 | kind = STRTOG_NaN;
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| 101 | break;
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| 102 | default:
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| 103 | abort();
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| 104 | }
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| 105 |
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| 106 | ret = gdtoa(&fpi, be, (ULong *)bits, &kind, mode, ndigits, decpt, rve);
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| 107 | if (*decpt == -32768)
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| 108 | *decpt = INT_MAX;
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| 109 | return ret;
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| 110 | #else
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| 111 | return dtoa((double)*ld, mode, ndigits, decpt, sign, rve);
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| 112 | #endif
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| 113 | }
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