OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [stdlib/] [gdtoa-hexnan.c] - Blame information for rev 816

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 148 jeremybenn 
/****************************************************************
2 
 
3 
The author of this software is David M. Gay.
4 
 
5 
Copyright (C) 2000 by Lucent Technologies
6 
All Rights Reserved
7 
 
8 
Permission to use, copy, modify, and distribute this software and
9 
its documentation for any purpose and without fee is hereby
10 
granted, provided that the above copyright notice appear in all
11 
copies and that both that the copyright notice and this
12 
permission notice and warranty disclaimer appear in supporting
13 
documentation, and that the name of Lucent or any of its entities
14 
not be used in advertising or publicity pertaining to
15 
distribution of the software without specific, written prior
16 
permission.
17 
 
18 
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
20 
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
21 
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22 
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
23 
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
24 
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
25 
THIS SOFTWARE.
26 
 
27 
****************************************************************/
28 
 
29 
/* Please send bug reports to
30 
        David M. Gay
31 
        Bell Laboratories, Room 2C-463
32 
        600 Mountain Avenue
33 
        Murray Hill, NJ 07974-0636
34 
        U.S.A.
35 
        dmg@bell-labs.com
36 
 */
37 
 
38 
/* Modified 06-21-2006 by Jeff Johnston to work with newlib.  */
39 
 
40 
#include <_ansi.h>
41 
#include <reent.h>
42 
#include <string.h>
43 
#include "mprec.h"
44 
#include "gdtoa.h"
45 
 
46 
#ifdef INFNAN_CHECK
47 
static void
48 
_DEFUN (L_shift, (x, x1, i),
49 
        __ULong *x _AND
50 
        __ULong *x1 _AND
51 
        int i)
52 
{
53 
        int j;
54 
 
55 
        i = 8 - i;
56 
        i <<= 2;
57 
        j = ULbits - i;
58 
        do {
59 
                *x |= x[1] << j;
60 
                x[1] >>= i;
61 
                } while(++x < x1);
62 
}
63 
 
64 
int
65 
_DEFUN (hexnan, (sp, fpi, x0),
66 
        _CONST char **sp _AND
67 
        FPI *fpi _AND
68 
        __ULong *x0)
69 
{
70 
        __ULong c, h, *x, *x1, *xe;
71 
        _CONST char *s;
72 
        int havedig, hd0, i, nbits;
73 
 
74 
        if (!hexdig['0'])
75 
                hexdig_init();
76 
        nbits = fpi->nbits;
77 
        x = x0 + (nbits >> kshift);
78 
        if (nbits & kmask)
79 
                x++;
80 
        *--x = 0;
81 
        x1 = xe = x;
82 
        havedig = hd0 = i = 0;
83 
        s = *sp;
84 
        while((c = *(_CONST unsigned char*)++s)) {
85 
                if (!(h = hexdig[c])) {
86 
                        if (c <= ' ') {
87 
                                if (hd0 < havedig) {
88 
                                        if (x < x1 && i < 8)
89 
                                                L_shift(x, x1, i);
90 
                                        if (x <= x0) {
91 
                                                i = 8;
92 
                                                continue;
93 
                                                }
94 
                                        hd0 = havedig;
95 
                                        *--x = 0;
96 
                                        x1 = x;
97 
                                        i = 0;
98 
                                        }
99 
                                continue;
100 
                                }
101 
                        if (/*(*/ c == ')') {
102 
                                *sp = s + 1;
103 
                                break;
104 
                                }
105 
                        return STRTOG_NaN;
106 
                        }
107 
                havedig++;
108 
                if (++i > 8) {
109 
                        if (x <= x0)
110 
                                continue;
111 
                        i = 1;
112 
                        *--x = 0;
113 
                        }
114 
                *x = ((*x << 4) | (h & 0xf));
115 
                }
116 
        if (!havedig)
117 
                return STRTOG_NaN;
118 
        if (x < x1 && i < 8)
119 
                L_shift(x, x1, i);
120 
        if (x > x0) {
121 
                x1 = x0;
122 
                do *x1++ = *x++;
123 
                        while(x <= xe);
124 
                do *x1++ = 0;
125 
                        while(x1 <= xe);
126 
                }
127 
        else {
128 
                /* truncate high-order word if necessary */
129 
                if ( (i = nbits & (ULbits-1)) !=0)
130 
                        *xe &= ((__ULong)0xffffffff) >> (ULbits - i);
131 
                }
132 
        for(x1 = xe;; --x1) {
133 
                if (*x1 != 0)
134 
                        break;
135 
                if (x1 == x0) {
136 
                        *x1 = 1;
137 
                        break;
138 
                        }
139 
                }
140 
        return STRTOG_NaNbits;
141 
}
142 
#endif /* INFNAN_CHECK */

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.