mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-29 23:41:48 +00:00
349 lines
7 KiB
C
349 lines
7 KiB
C
/****************************************************************
|
|
|
|
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 "gdtoaimp.h"
|
|
|
|
#ifdef USE_LOCALE
|
|
#include "locale.h"
|
|
#endif
|
|
|
|
int
|
|
#ifdef KR_headers
|
|
gethex(sp, fpi, exp, bp, sign)
|
|
CONST char **sp; FPI *fpi; Long *exp; Bigint **bp; int sign;
|
|
#else
|
|
gethex( CONST char **sp, FPI *fpi, Long *exp, Bigint **bp, int sign)
|
|
#endif
|
|
{
|
|
Bigint *b;
|
|
CONST unsigned char *decpt, *s0, *s, *s1;
|
|
int big, esign, havedig, irv, j, k, n, n0, nbits, up, zret;
|
|
ULong L, lostbits, *x;
|
|
Long e, e1;
|
|
#ifdef USE_LOCALE
|
|
int i;
|
|
#ifdef NO_LOCALE_CACHE
|
|
const unsigned char *decimalpoint = (unsigned char*)localeconv()->decimal_point;
|
|
#else
|
|
const unsigned char *decimalpoint;
|
|
static unsigned char *decimalpoint_cache;
|
|
if (!(s0 = decimalpoint_cache)) {
|
|
s0 = (unsigned char*)localeconv()->decimal_point;
|
|
if ((decimalpoint_cache = (char*)MALLOC(strlen(s0) + 1))) {
|
|
strcpy(decimalpoint_cache, s0);
|
|
s0 = decimalpoint_cache;
|
|
}
|
|
}
|
|
decimalpoint = s0;
|
|
#endif
|
|
#endif
|
|
|
|
/**** if (!hexdig['0']) hexdig_init_D2A(); ****/
|
|
*bp = 0;
|
|
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])
|
|
havedig++;
|
|
else {
|
|
zret = 1;
|
|
#ifdef USE_LOCALE
|
|
for(i = 0; decimalpoint[i]; ++i) {
|
|
if (s[i] != decimalpoint[i])
|
|
goto pcheck;
|
|
}
|
|
decpt = s += i;
|
|
#else
|
|
if (*s != '.')
|
|
goto pcheck;
|
|
decpt = ++s;
|
|
#endif
|
|
if (!hexdig[*s])
|
|
goto pcheck;
|
|
while(*s == '0')
|
|
s++;
|
|
if (hexdig[*s])
|
|
zret = 0;
|
|
havedig = 1;
|
|
s0 = s;
|
|
}
|
|
while(hexdig[*s])
|
|
s++;
|
|
#ifdef USE_LOCALE
|
|
if (*s == *decimalpoint && !decpt) {
|
|
for(i = 1; decimalpoint[i]; ++i) {
|
|
if (s[i] != decimalpoint[i])
|
|
goto pcheck;
|
|
}
|
|
decpt = s += i;
|
|
#else
|
|
if (*s == '.' && !decpt) {
|
|
decpt = ++s;
|
|
#endif
|
|
while(hexdig[*s])
|
|
s++;
|
|
}/*}*/
|
|
if (decpt)
|
|
e = -(((Long)(s-decpt)) << 2);
|
|
pcheck:
|
|
s1 = s;
|
|
big = esign = 0;
|
|
switch(*s) {
|
|
case 'p':
|
|
case 'P':
|
|
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) {
|
|
if (e1 & 0xf8000000)
|
|
big = 1;
|
|
e1 = 10*e1 + n - 0x10;
|
|
}
|
|
if (esign)
|
|
e1 = -e1;
|
|
e += e1;
|
|
}
|
|
*sp = (char*)s;
|
|
if (!havedig)
|
|
*sp = (char*)s0 - 1;
|
|
if (zret)
|
|
return STRTOG_Zero;
|
|
if (big) {
|
|
if (esign) {
|
|
switch(fpi->rounding) {
|
|
case FPI_Round_up:
|
|
if (sign)
|
|
break;
|
|
goto ret_tiny;
|
|
case FPI_Round_down:
|
|
if (!sign)
|
|
break;
|
|
goto ret_tiny;
|
|
}
|
|
goto retz;
|
|
ret_tiny:
|
|
b = Balloc(0);
|
|
b->wds = 1;
|
|
b->x[0] = 1;
|
|
goto dret;
|
|
}
|
|
switch(fpi->rounding) {
|
|
case FPI_Round_near:
|
|
goto ovfl1;
|
|
case FPI_Round_up:
|
|
if (!sign)
|
|
goto ovfl1;
|
|
goto ret_big;
|
|
case FPI_Round_down:
|
|
if (sign)
|
|
goto ovfl1;
|
|
goto ret_big;
|
|
}
|
|
ret_big:
|
|
nbits = fpi->nbits;
|
|
n0 = n = nbits >> kshift;
|
|
if (nbits & kmask)
|
|
++n;
|
|
for(j = n, k = 0; j >>= 1; ++k);
|
|
*bp = b = Balloc(k);
|
|
b->wds = n;
|
|
for(j = 0; j < n0; ++j)
|
|
b->x[j] = ALL_ON;
|
|
if (n > n0)
|
|
b->x[j] = ULbits >> (ULbits - (nbits & kmask));
|
|
*exp = fpi->emin;
|
|
return STRTOG_Normal | STRTOG_Inexlo;
|
|
}
|
|
n = s1 - s0 - 1;
|
|
for(k = 0; n > (1 << (kshift-2)) - 1; n >>= 1)
|
|
k++;
|
|
b = Balloc(k);
|
|
x = b->x;
|
|
n = 0;
|
|
L = 0;
|
|
#ifdef USE_LOCALE
|
|
for(i = 0; decimalpoint[i+1]; ++i);
|
|
#endif
|
|
while(s1 > s0) {
|
|
#ifdef USE_LOCALE
|
|
if (*--s1 == decimalpoint[i]) {
|
|
s1 -= i;
|
|
continue;
|
|
}
|
|
#else
|
|
if (*--s1 == '.')
|
|
continue;
|
|
#endif
|
|
if (n == ULbits) {
|
|
*x++ = L;
|
|
L = 0;
|
|
n = 0;
|
|
}
|
|
L |= (hexdig[*s1] & 0x0f) << n;
|
|
n += 4;
|
|
}
|
|
*x++ = L;
|
|
b->wds = n = x - b->x;
|
|
n = ULbits*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 > 0 && any_on(b,k))
|
|
lostbits = 3;
|
|
}
|
|
}
|
|
rshift(b, n);
|
|
e += n;
|
|
}
|
|
else if (n < nbits) {
|
|
n = nbits - n;
|
|
b = lshift(b, n);
|
|
e -= n;
|
|
x = b->x;
|
|
}
|
|
if (e > fpi->emax) {
|
|
ovfl:
|
|
Bfree(b);
|
|
ovfl1:
|
|
#ifndef NO_ERRNO
|
|
errno = ERANGE;
|
|
#endif
|
|
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:
|
|
x[0] = b->wds = 1;
|
|
dret:
|
|
*bp = b;
|
|
*exp = fpi->emin;
|
|
#ifndef NO_ERRNO
|
|
errno = ERANGE;
|
|
#endif
|
|
return STRTOG_Denormal | STRTOG_Inexhi
|
|
| STRTOG_Underflow;
|
|
}
|
|
}
|
|
Bfree(b);
|
|
retz:
|
|
#ifndef NO_ERRNO
|
|
errno = ERANGE;
|
|
#endif
|
|
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 | 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(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;
|
|
}
|