1/* $NetBSD: strtorx.c,v 1.3 2008/03/21 23:13:48 christos 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#include "gdtoaimp.h"
35
36#undef _0
37#undef _1
38
39/* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */
40
41#ifdef IEEE_BIG_ENDIAN
42#define _0 0
43#define _1 1
44#define _2 2
45#define _3 3
46#define _4 4
47#endif
48#ifdef IEEE_LITTLE_ENDIAN
49#define _0 4
50#define _1 3
51#define _2 2
52#define _3 1
53#define _4 0
54#endif
55
56 void
57#ifdef KR_headers
58ULtox(L, bits, expt, k) UShort *L; ULong *bits; Long expt; int k;
59#else
60ULtox(UShort *L, ULong *bits, Long expt, int k)
61#endif
62{
63	switch(k & STRTOG_Retmask) {
64	  case STRTOG_NoNumber:
65	  case STRTOG_Zero:
66		L[0] = L[1] = L[2] = L[3] = L[4] = 0;
67		break;
68
69	  case STRTOG_Denormal:
70		L[_0] = 0;
71		goto normal_bits;
72
73	  case STRTOG_Normal:
74	  case STRTOG_NaNbits:
75		L[_0] = expt + 0x3fff + 63;
76 normal_bits:
77		L[_4] = (UShort)bits[0];
78		L[_3] = (UShort)(bits[0] >> 16);
79		L[_2] = (UShort)bits[1];
80		L[_1] = (UShort)(bits[1] >> 16);
81		break;
82
83	  case STRTOG_Infinite:
84		L[_0] = 0x7fff;
85		L[_1] = 0x8000;
86		L[_2] = L[_3] = L[_4] = 0;
87		break;
88
89	  case STRTOG_NaN:
90		L[0] = ldus_QNAN0;
91		L[1] = ldus_QNAN1;
92		L[2] = ldus_QNAN2;
93		L[3] = ldus_QNAN3;
94		L[4] = ldus_QNAN4;
95	  }
96	if (k & STRTOG_Neg)
97		L[_0] |= 0x8000;
98	}
99
100 int
101#ifdef KR_headers
102strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
103#else
104strtorx(CONST char *s, char **sp, int rounding, void *L)
105#endif
106{
107	static CONST FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
108	CONST FPI *fpi;
109	FPI fpi1;
110	ULong bits[2];
111	Long expt;
112	int k;
113
114	fpi = &fpi0;
115	if (rounding != FPI_Round_near) {
116		fpi1 = fpi0;
117		fpi1.rounding = rounding;
118		fpi = &fpi1;
119		}
120	k = strtodg(s, sp, fpi, &expt, bits);
121	if (k == STRTOG_NoMemory)
122		return k;
123	    ULtox((UShort*)L, bits, expt, k);
124	return k;
125	}
126