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/****************************************************************
 
The author of this software is David M. Gay.
 
Copyright (C) 1998 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 (dmg at acm dot org,
 * with " at " changed at "@" and " dot " changed to ".").      */
 
#include <_ansi.h>
#include <reent.h>
#include <string.h>
#include "mprec.h"
#include "gdtoa.h"
#include "gd_qnan.h"
 
#ifdef USE_LOCALE
#include "locale.h"
#endif
 
unsigned char hexdig[256];
 
static void
_DEFUN (htinit, (h, s, inc),
        unsigned char *h _AND
        unsigned char *s _AND
        int inc)
{
        int i, j;
        for(i = 0; (j = s[i]) !=0; i++)
                h[j] = i + inc;
}
 
void
_DEFUN_VOID (hexdig_init)
{
#define USC (unsigned char *)
        htinit(hexdig, USC "0123456789", 0x10);
        htinit(hexdig, USC "abcdef", 0x10 + 10);
        htinit(hexdig, USC "ABCDEF", 0x10 + 10);
}
 
static void
_DEFUN(rshift, (b, k),
        _Bigint *b _AND
        int k)
{
        __ULong *x, *x1, *xe, y;
        int n;
 
        x = x1 = b->_x;
        n = k >> kshift;
        if (n < b->_wds) {
                xe = x + b->_wds;
                x += n;
                if (k &= kmask) {
                        n = ULbits - k;
                        y = *x++ >> k;
                        while(x < xe) {
                                *x1++ = (y | (*x << n)) & ALL_ON;
                                y = *x++ >> k;
                                }
                        if ((*x1 = y) !=0)
                                x1++;
                        }
                else
                        while(x < xe)
                                *x1++ = *x++;
                }
        if ((b->_wds = x1 - b->_x) == 0)
                b->_x[0] = 0;
}
 
static _Bigint *
_DEFUN (increment, (ptr, b),
        struct _reent *ptr _AND
        _Bigint *b)
{
        __ULong *x, *xe;
        _Bigint *b1;
#ifdef Pack_16
        __ULong carry = 1, y;
#endif
 
        x = b->_x;
        xe = x + b->_wds;
#ifdef Pack_32
        do {
                if (*x < (__ULong)0xffffffffL) {
                        ++*x;
                        return b;
                        }
                *x++ = 0;
                } while(x < xe);
#else
        do {
                y = *x + carry;
                carry = y >> 16;
                *x++ = y & 0xffff;
                if (!carry)
                        return b;
                } while(x < xe);
        if (carry)
#endif
        {
                if (b->_wds >= b->_maxwds) {
                        b1 = Balloc(ptr, b->_k+1);
                        Bcopy(b1, b);
                        Bfree(ptr, b);
                        b = b1;
                        }
                b->_x[b->_wds++] = 1;
                }
        return b;
}
 
 
int
_DEFUN(gethex, (ptr, sp, fpi, exp, bp, sign),
        struct _reent *ptr _AND
        _CONST char **sp _AND
        FPI *fpi _AND
        Long *exp _AND
        _Bigint **bp _AND
        int sign)
{
        _Bigint *b;
        _CONST unsigned char *decpt, *s0, *s, *s1;
        int esign, havedig, irv, k, n, nbits, up, zret;
        __ULong L, lostbits, *x;
        Long e, e1;
#ifdef USE_LOCALE
        unsigned char decimalpoint = *localeconv()->decimal_point;
#else
#define decimalpoint '.'
#endif
 
        if (!hexdig['0'])
                hexdig_init();
        havedig = 0;
        s0 = *(_CONST unsigned char **)sp + 2;
        while(s0[havedig] == '0')
                havedig++;
        s0 += havedig;
        s = s0;
        decpt = 0;
        zret = 0;
        e = 0;
        if (!hexdig[*s]) {
                zret = 1;
                if (*s != decimalpoint)
                        goto pcheck;
                decpt = ++s;
                if (!hexdig[*s])
                        goto pcheck;
                while(*s == '0')
                        s++;
                if (hexdig[*s])
                        zret = 0;
                havedig = 1;
                s0 = s;
                }
        while(hexdig[*s])
                s++;
        if (*s == decimalpoint && !decpt) {
                decpt = ++s;
                while(hexdig[*s])
                        s++;
                }
        if (decpt)
                e = -(((Long)(s-decpt)) << 2);
 pcheck:
        s1 = s;
        switch(*s) {
          case 'p':
          case 'P':
                esign = 0;
                switch(*++s) {
                  case '-':
                        esign = 1;
                        /* no break */
                  case '+':
                        s++;
                  }
                if ((n = hexdig[*s]) == 0 || n > 0x19) {
                        s = s1;
                        break;
                        }
                e1 = n - 0x10;
                while((n = hexdig[*++s]) !=0 && n <= 0x19)
                        e1 = 10*e1 + n - 0x10;
                if (esign)
                        e1 = -e1;
                e += e1;
          }
        *sp = (char*)s;
        if (zret)
                return havedig ? STRTOG_Zero : STRTOG_NoNumber;
        n = s1 - s0 - 1;
        for(k = 0; n > 7; n >>= 1)
                k++;
        b = Balloc(ptr, k);
        x = b->_x;
        n = 0;
        L = 0;
        while(s1 > s0) {
                if (*--s1 == decimalpoint)
                        continue;
                if (n == 32) {
                        *x++ = L;
                        L = 0;
                        n = 0;
                        }
                L |= (hexdig[*s1] & 0x0f) << n;
                n += 4;
                }
        *x++ = L;
        b->_wds = n = x - b->_x;
        n = 32*n - hi0bits(L);
        nbits = fpi->nbits;
        lostbits = 0;
        x = b->_x;
        if (n > nbits) {
                n -= nbits;
                if (any_on(b,n)) {
                        lostbits = 1;
                        k = n - 1;
                        if (x[k>>kshift] & 1 << (k & kmask)) {
                                lostbits = 2;
                                if (k > 1 && any_on(b,k-1))
                                        lostbits = 3;
                                }
                        }
                rshift(b, n);
                e += n;
                }
        else if (n < nbits) {
                n = nbits - n;
                b = lshift(ptr, b, n);
                e -= n;
                x = b->_x;
                }
        if (e > fpi->emax) {
 ovfl:
                Bfree(ptr, b);
                *bp = 0;
                return STRTOG_Infinite | STRTOG_Overflow | STRTOG_Inexhi;
                }
        irv = STRTOG_Normal;
        if (e < fpi->emin) {
                irv = STRTOG_Denormal;
                n = fpi->emin - e;
                if (n >= nbits) {
                        switch (fpi->rounding) {
                          case FPI_Round_near:
                                if (n == nbits && (n < 2 || any_on(b,n-1)))
                                        goto one_bit;
                                break;
                          case FPI_Round_up:
                                if (!sign)
                                        goto one_bit;
                                break;
                          case FPI_Round_down:
                                if (sign) {
 one_bit:
                                        *exp = fpi->emin;
                                        x[0] = b->_wds = 1;
                                        *bp = b;
                                        return STRTOG_Denormal | STRTOG_Inexhi
                                                | STRTOG_Underflow;
                                        }
                          }
                        Bfree(ptr, b);
                        *bp = 0;
                        return STRTOG_Zero | STRTOG_Inexlo | STRTOG_Underflow;
                        }
                k = n - 1;
                if (lostbits)
                        lostbits = 1;
                else if (k > 0)
                        lostbits = any_on(b,k);
                if (x[k>>kshift] & 1 << (k & kmask))
                        lostbits |= 2;
                nbits -= n;
                rshift(b,n);
                e = fpi->emin;
                }
        if (lostbits) {
                up = 0;
                switch(fpi->rounding) {
                  case FPI_Round_zero:
                        break;
                  case FPI_Round_near:
                    if ((lostbits & 2)
                            && ((lostbits & 1) | (x[0] & 1)))
                                up = 1;
                        break;
                  case FPI_Round_up:
                        up = 1 - sign;
                        break;
                  case FPI_Round_down:
                        up = sign;
                  }
                if (up) {
                        k = b->_wds;
                        b = increment(ptr, b);
                        x = b->_x;
                        if (irv == STRTOG_Denormal) {
                                if (nbits == fpi->nbits - 1
                                 && x[nbits >> kshift] & 1 << (nbits & kmask))
                                        irv =  STRTOG_Normal;
                                }
                        else if ((b->_wds > k)
                         || ((n = nbits & kmask) !=0
                             && (hi0bits(x[k-1]) < 32-n))) {
                                rshift(b,1);
                                if (++e > fpi->emax)
                                        goto ovfl;
                                }
                        irv |= STRTOG_Inexhi;
                        }
                else
                        irv |= STRTOG_Inexlo;
                }
        *bp = b;
        *exp = e;
        return irv;
}
 

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdlib/] [gdtoa-gethex.c] - Blame information for rev 455

Line No.	Rev	Author	Line
1	148	jeremybenn	`/****************************************************************`
2
3			`The author of this software is David M. Gay.`
4
5			`Copyright (C) 1998 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 David M. Gay (dmg at acm dot org,`
30			`* with " at " changed at "@" and " dot " changed to "."). */`
31
32			`#include <_ansi.h>`
33			`#include <reent.h>`
34			`#include <string.h>`
35			`#include "mprec.h"`
36			`#include "gdtoa.h"`
37			`#include "gd_qnan.h"`
38
39			`#ifdef USE_LOCALE`
40			`#include "locale.h"`
41			`#endif`
42
43			`unsigned char hexdig[256];`
44
45			`static void`
46			`_DEFUN (htinit, (h, s, inc),`
47			`unsigned char *h _AND`
48			`unsigned char *s _AND`
49			`int inc)`
50			`{`
51			`int i, j;`
52			`for(i = 0; (j = s[i]) !=0; i++)`
53			`h[j] = i + inc;`
54			`}`
55
56			`void`
57			`_DEFUN_VOID (hexdig_init)`
58			`{`
59			`#define USC (unsigned char *)`
60			`htinit(hexdig, USC "0123456789", 0x10);`
61			`htinit(hexdig, USC "abcdef", 0x10 + 10);`
62			`htinit(hexdig, USC "ABCDEF", 0x10 + 10);`
63			`}`
64
65			`static void`
66			`_DEFUN(rshift, (b, k),`
67			`_Bigint *b _AND`
68			`int k)`
69			`{`
70			`__ULong x, x1, *xe, y;`
71			`int n;`
72
73			`x = x1 = b->_x;`
74			`n = k >> kshift;`
75			`if (n < b->_wds) {`
76			`xe = x + b->_wds;`
77			`x += n;`
78			`if (k &= kmask) {`
79			`n = ULbits - k;`
80			`y = *x++ >> k;`
81			`while(x < xe) {`
82			`x1++ = (y \| (x << n)) & ALL_ON;`
83			`y = *x++ >> k;`
84			`}`
85			`if ((*x1 = y) !=0)`
86			`x1++;`
87			`}`
88			`else`
89			`while(x < xe)`
90			`x1++ = x++;`
91			`}`
92			`if ((b->_wds = x1 - b->_x) == 0)`
93			`b->_x[0] = 0;`
94			`}`
95
96			`static _Bigint *`
97			`_DEFUN (increment, (ptr, b),`
98			`struct _reent *ptr _AND`
99			`_Bigint *b)`
100			`{`
101			`__ULong x, xe;`
102			`_Bigint *b1;`
103			`#ifdef Pack_16`
104			`__ULong carry = 1, y;`
105			`#endif`
106
107			`x = b->_x;`
108			`xe = x + b->_wds;`
109			`#ifdef Pack_32`
110			`do {`
111			`if (*x < (__ULong)0xffffffffL) {`
112			`++*x;`
113			`return b;`
114			`}`
115			`*x++ = 0;`
116			`} while(x < xe);`
117			`#else`
118			`do {`
119			`y = *x + carry;`
120			`carry = y >> 16;`
121			`*x++ = y & 0xffff;`
122			`if (!carry)`
123			`return b;`
124			`} while(x < xe);`
125			`if (carry)`
126			`#endif`
127			`{`
128			`if (b->_wds >= b->_maxwds) {`
129			`b1 = Balloc(ptr, b->_k+1);`
130			`Bcopy(b1, b);`
131			`Bfree(ptr, b);`
132			`b = b1;`
133			`}`
134			`b->_x[b->_wds++] = 1;`
135			`}`
136			`return b;`
137			`}`
138
139
140			`int`
141			`_DEFUN(gethex, (ptr, sp, fpi, exp, bp, sign),`
142			`struct _reent *ptr _AND`
143			`_CONST char **sp _AND`
144			`FPI *fpi _AND`
145			`Long *exp _AND`
146			`_Bigint **bp _AND`
147			`int sign)`
148			`{`
149			`_Bigint *b;`
150			`_CONST unsigned char decpt, s0, s, s1;`
151			`int esign, havedig, irv, k, n, nbits, up, zret;`
152			`__ULong L, lostbits, *x;`
153			`Long e, e1;`
154			`#ifdef USE_LOCALE`
155			`unsigned char decimalpoint = *localeconv()->decimal_point;`
156			`#else`
157			`#define decimalpoint '.'`
158			`#endif`
159
160			`if (!hexdig['0'])`
161			`hexdig_init();`
162			`havedig = 0;`
163			`s0 = (_CONST unsigned char *)sp + 2;`
164			`while(s0[havedig] == '0')`
165			`havedig++;`
166			`s0 += havedig;`
167			`s = s0;`
168			`decpt = 0;`
169			`zret = 0;`
170			`e = 0;`
171			`if (!hexdig[*s]) {`
172			`zret = 1;`
173			`if (*s != decimalpoint)`
174			`goto pcheck;`
175			`decpt = ++s;`
176			`if (!hexdig[*s])`
177			`goto pcheck;`
178			`while(*s == '0')`
179			`s++;`
180			`if (hexdig[*s])`
181			`zret = 0;`
182			`havedig = 1;`
183			`s0 = s;`
184			`}`
185			`while(hexdig[*s])`
186			`s++;`
187			`if (*s == decimalpoint && !decpt) {`
188			`decpt = ++s;`
189			`while(hexdig[*s])`
190			`s++;`
191			`}`
192			`if (decpt)`
193			`e = -(((Long)(s-decpt)) << 2);`
194			`pcheck:`
195			`s1 = s;`
196			`switch(*s) {`
197			`case 'p':`
198			`case 'P':`
199			`esign = 0;`
200			`switch(*++s) {`
201			`case '-':`
202			`esign = 1;`
203			`/* no break */`
204			`case '+':`
205			`s++;`
206			`}`
207			`if ((n = hexdig[*s]) == 0 \|\| n > 0x19) {`
208			`s = s1;`
209			`break;`
210			`}`
211			`e1 = n - 0x10;`
212			`while((n = hexdig[*++s]) !=0 && n <= 0x19)`
213			`e1 = 10*e1 + n - 0x10;`
214			`if (esign)`
215			`e1 = -e1;`
216			`e += e1;`
217			`}`
218			`sp = (char)s;`
219			`if (zret)`
220			`return havedig ? STRTOG_Zero : STRTOG_NoNumber;`
221			`n = s1 - s0 - 1;`
222			`for(k = 0; n > 7; n >>= 1)`
223			`k++;`
224			`b = Balloc(ptr, k);`
225			`x = b->_x;`
226			`n = 0;`
227			`L = 0;`
228			`while(s1 > s0) {`
229			`if (*--s1 == decimalpoint)`
230			`continue;`
231			`if (n == 32) {`
232			`*x++ = L;`
233			`L = 0;`
234			`n = 0;`
235			`}`
236			`L \|= (hexdig[*s1] & 0x0f) << n;`
237			`n += 4;`
238			`}`
239			`*x++ = L;`
240			`b->_wds = n = x - b->_x;`
241			`n = 32*n - hi0bits(L);`
242			`nbits = fpi->nbits;`
243			`lostbits = 0;`
244			`x = b->_x;`
245			`if (n > nbits) {`
246			`n -= nbits;`
247			`if (any_on(b,n)) {`
248			`lostbits = 1;`
249			`k = n - 1;`
250			`if (x[k>>kshift] & 1 << (k & kmask)) {`
251			`lostbits = 2;`
252			`if (k > 1 && any_on(b,k-1))`
253			`lostbits = 3;`
254			`}`
255			`}`
256			`rshift(b, n);`
257			`e += n;`
258			`}`
259			`else if (n < nbits) {`
260			`n = nbits - n;`
261			`b = lshift(ptr, b, n);`
262			`e -= n;`
263			`x = b->_x;`
264			`}`
265			`if (e > fpi->emax) {`
266			`ovfl:`
267			`Bfree(ptr, b);`
268			`*bp = 0;`
269			`return STRTOG_Infinite \| STRTOG_Overflow \| STRTOG_Inexhi;`
270			`}`
271			`irv = STRTOG_Normal;`
272			`if (e < fpi->emin) {`
273			`irv = STRTOG_Denormal;`
274			`n = fpi->emin - e;`
275			`if (n >= nbits) {`
276			`switch (fpi->rounding) {`
277			`case FPI_Round_near:`
278			`if (n == nbits && (n < 2 \|\| any_on(b,n-1)))`
279			`goto one_bit;`
280			`break;`
281			`case FPI_Round_up:`
282			`if (!sign)`
283			`goto one_bit;`
284			`break;`
285			`case FPI_Round_down:`
286			`if (sign) {`
287			`one_bit:`
288			`*exp = fpi->emin;`
289			`x[0] = b->_wds = 1;`
290			`*bp = b;`
291			`return STRTOG_Denormal \| STRTOG_Inexhi`
292			`\| STRTOG_Underflow;`
293			`}`
294			`}`
295			`Bfree(ptr, b);`
296			`*bp = 0;`
297			`return STRTOG_Zero \| STRTOG_Inexlo \| STRTOG_Underflow;`
298			`}`
299			`k = n - 1;`
300			`if (lostbits)`
301			`lostbits = 1;`
302			`else if (k > 0)`
303			`lostbits = any_on(b,k);`
304			`if (x[k>>kshift] & 1 << (k & kmask))`
305			`lostbits \|= 2;`
306			`nbits -= n;`
307			`rshift(b,n);`
308			`e = fpi->emin;`
309			`}`
310			`if (lostbits) {`
311			`up = 0;`
312			`switch(fpi->rounding) {`
313			`case FPI_Round_zero:`
314			`break;`
315			`case FPI_Round_near:`
316			`if ((lostbits & 2)`
317			`&& ((lostbits & 1) \| (x[0] & 1)))`
318			`up = 1;`
319			`break;`
320			`case FPI_Round_up:`
321			`up = 1 - sign;`
322			`break;`
323			`case FPI_Round_down:`
324			`up = sign;`
325			`}`
326			`if (up) {`
327			`k = b->_wds;`
328			`b = increment(ptr, b);`
329			`x = b->_x;`
330			`if (irv == STRTOG_Denormal) {`
331			`if (nbits == fpi->nbits - 1`
332			`&& x[nbits >> kshift] & 1 << (nbits & kmask))`
333			`irv = STRTOG_Normal;`
334			`}`
335			`else if ((b->_wds > k)`
336			`\|\| ((n = nbits & kmask) !=0`
337			`&& (hi0bits(x[k-1]) < 32-n))) {`
338			`rshift(b,1);`
339			`if (++e > fpi->emax)`
340			`goto ovfl;`
341			`}`
342			`irv \|= STRTOG_Inexhi;`
343			`}`
344			`else`
345			`irv \|= STRTOG_Inexlo;`
346			`}`
347			`*bp = b;`
348			`*exp = e;`
349			`return irv;`
350			`}`
351