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#include <_ansi.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <reent.h>
#include "fix64.h"
/*
* Convert a string to a fixed-point 64-bit unsigned value.
*
* Ignores `locale' stuff.
*/
__uint64_t
_DEFUN (_strtoufix64_r, (rptr, nptr, endptr),
struct _reent *rptr _AND
_CONST char *nptr _AND
char **endptr)
{
union long_double_union ldbl;
int exp, sign, negexp, ld_type;
__uint64_t tmp, tmp2, result = 0;
init(ldbl);
_simdstrtold ((char *)nptr, endptr, &ldbl);
/* treat NAN as domain error, +/- infinity as saturation */
ld_type = _simdldcheck (&ldbl.ld);
if (ld_type != 0)
{
if (ld_type == 1)
{
rptr->_errno = EDOM;
return 0;
}
rptr->_errno = ERANGE;
if (word0(ldbl) & Sign_bit)
return 0;
return ULONG_LONG_MAX;
}
/* strip off sign and exponent */
sign = word0(ldbl) & Sign_bit;
exp = ((word0(ldbl) & Exp_mask) >> Exp_shift) - Bias;
negexp = -exp;
if (negexp > 63)
return 0;
word0(ldbl) &= ~(Exp_mask | Sign_bit);
/* add in implicit normalized bit */
word0(ldbl) |= Exp_msk1;
/* shift so result is contained in single word */
tmp = word0(ldbl) << Ebits;
tmp |= ((unsigned long)word1(ldbl) >> (32 - Ebits));
tmp <<= 32;
if (Ebits < 32)
tmp |= ((unsigned long)word1(ldbl) << Ebits);
tmp |= ((unsigned long)word2(ldbl) >> (32 - Ebits));
/* check for saturation */
if (sign)
{
rptr->_errno = ERANGE;
return 0;
}
else
{
if (exp > 0 || (exp == 0 && tmp >= 0x8000000000000000LL))
{
rptr->_errno = ERANGE;
return ULONG_LONG_MAX;
}
}
/* otherwise we have normal number in range */
if (negexp > 1)
{
tmp2 = tmp + (1 << (negexp - 2));
result = (tmp2 >> (negexp - 1));
/* if rounding causes carry, add carry bit in */
if (tmp2 < tmp)
result += 1 << (64 - negexp);
}
else
{
if (Ebits < 32)
{
result = tmp + ((word2(ldbl) & (1 << (64 - Ebits - 1))) != 0);
/* if rounding causes carry, then saturation has occurred */
if (result < tmp)
{
rptr->_errno = ERANGE;
return ULONG_LONG_MAX;
}
}
else
result = tmp;
}
return result;
}
#ifndef _REENT_ONLY
__uint64_t
_DEFUN (strtoufix64, (s, ptr, base),
_CONST char *s _AND
char **ptr)
{
return _strtoufix64_r (_REENT, s, ptr);
}
#endif
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