strtorx.c revision 165743 
1/****************************************************************
2
3The author of this software is David M. Gay.
4
5Copyright (C) 1998, 2000 by Lucent Technologies
6All Rights Reserved
7
8Permission to use, copy, modify, and distribute this software and
9its documentation for any purpose and without fee is hereby
10granted, provided that the above copyright notice appear in all
11copies and that both that the copyright notice and this
12permission notice and warranty disclaimer appear in supporting
13documentation, and that the name of Lucent or any of its entities
14not be used in advertising or publicity pertaining to
15distribution of the software without specific, written prior
16permission.
17
18LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
20IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
21SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
23IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
24ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
25THIS SOFTWARE.
26
27****************************************************************/
28
29/* Please send bug reports to David M. Gay (dmg at acm dot org,
30 * with " at " changed at "@" and " dot " changed to ".").	*/
31
32#include "gdtoaimp.h"
33
34#undef _0
35#undef _1
36
37/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
38
39#ifdef IEEE_MC68k
40#define _0 0
41#define _1 1
42#define _2 2
43#define _3 3
44#define _4 4
45#endif
46#ifdef IEEE_8087
47#define _0 4
48#define _1 3
49#define _2 2
50#define _3 1
51#define _4 0
52#endif
53
54 void
55#ifdef KR_headers
56ULtox(L, bits, exp, k) UShort *L; ULong *bits; Long exp; int k;
57#else
58ULtox(UShort *L, ULong *bits, Long exp, int k)
59#endif
60{
61	switch(k & STRTOG_Retmask) {
62	  case STRTOG_NoNumber:
63	  case STRTOG_Zero:
64		L[0] = L[1] = L[2] = L[3] = L[4] = 0;
65		break;
66
67	  case STRTOG_Denormal:
68		L[_0] = 0;
69		goto normal_bits;
70
71	  case STRTOG_Normal:
72	  case STRTOG_NaNbits:
73		L[_0] = exp + 0x3fff + 63;
74 normal_bits:
75		L[_4] = (UShort)bits[0];
76		L[_3] = (UShort)(bits[0] >> 16);
77		L[_2] = (UShort)bits[1];
78		L[_1] = (UShort)(bits[1] >> 16);
79		break;
80
81	  case STRTOG_Infinite:
82		L[_0] = 0x7fff;
83		L[_1] = L[_2] = L[_3] = L[_4] = 0;
84		break;
85
86	  case STRTOG_NaN:
87		L[0] = ldus_QNAN0;
88		L[1] = ldus_QNAN1;
89		L[2] = ldus_QNAN2;
90		L[3] = ldus_QNAN3;
91		L[4] = ldus_QNAN4;
92	  }
93	if (k & STRTOG_Neg)
94		L[_0] |= 0x8000;
95	}
96
97 int
98#ifdef KR_headers
99strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
100#else
101strtorx(CONST char *s, char **sp, int rounding, void *L)
102#endif
103{
104	static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
105	FPI *fpi, fpi1;
106	ULong bits[2];
107	Long exp;
108	int k;
109
110	fpi = &fpi0;
111	if (rounding != FPI_Round_near) {
112		fpi1 = fpi0;
113		fpi1.rounding = rounding;
114		fpi = &fpi1;
115		}
116	k = strtodg(s, sp, fpi, &exp, bits);
117	ULtox((UShort*)L, bits, exp, k);
118	return k;
119	}
120