/**
* Currently, getDouble() depends on strtod() to do its conversion.
*
* WARNING!!
* This is an extremely costly function. ~1/2 of the conversion time
* can be linked to this function.
*/
double
DigitList::getDouble() const
{
{
Mutex mutex;
if (fHave == kDouble) {
return fUnion.fDouble;
}
}
double tDouble = 0.0;
if (isZero()) {
tDouble = 0.0;
if (decNumberIsNegative(fDecNumber)) {
tDouble /= -1;
}
} else if (isInfinite()) {
if (std::numeric_limits<double>::has_infinity) {
tDouble = std::numeric_limits<double>::infinity();
} else {
tDouble = std::numeric_limits<double>::max();
}
if (!isPositive()) {
tDouble = -tDouble; //this was incorrectly "-fDouble" originally.
}
} else {
MaybeStackArray<char, MAX_DBL_DIGITS+18> s;
// Note: 14 is a magic constant from the decNumber library documentation,
// the max number of extra characters beyond the number of digits
// needed to represent the number in string form. Add a few more
// for the additional digits we retain.
// Round down to appx. double precision, if the number is longer than that.
// Copy the number first, so that we don't modify the original.
if (getCount() > MAX_DBL_DIGITS + 3) {
DigitList numToConvert(*this);
numToConvert.reduce(); // Removes any trailing zeros, so that digit count is good.
numToConvert.round(MAX_DBL_DIGITS+3);
uprv_decNumberToString(numToConvert.fDecNumber, s.getAlias());
// TODO: how many extra digits should be included for an accurate conversion?
} else {
uprv_decNumberToString(this->fDecNumber, s.getAlias());
}
U_ASSERT(uprv_strlen(&s[0]) < MAX_DBL_DIGITS+18);
char *end = NULL;
tDouble = decimalStrToDouble(s.getAlias(), &end);
}
{
Mutex mutex;
DigitList *nonConstThis = const_cast<DigitList *>(this);
nonConstThis->internalSetDouble(tDouble);
}
return tDouble;
}
void ScriptSet::setScriptExtensions(UChar32 codePoint, UErrorCode& status) {
if (U_FAILURE(status)) { return; }
static const int32_t FIRST_GUESS_SCRIPT_CAPACITY = 5;
MaybeStackArray<UScriptCode,FIRST_GUESS_SCRIPT_CAPACITY> scripts;
UErrorCode internalStatus = U_ZERO_ERROR;
int32_t script_count = -1;
while (TRUE) {
script_count = uscript_getScriptExtensions(
codePoint, scripts.getAlias(), FIRST_GUESS_SCRIPT_CAPACITY, &internalStatus);
if (internalStatus == U_BUFFER_OVERFLOW_ERROR) {
// Need to allocate more space
if (scripts.resize(script_count) == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
internalStatus = U_ZERO_ERROR;
} else {
break;
}
}
// Check if we failed for some reason other than buffer overflow
if (U_FAILURE(internalStatus)) {
status = internalStatus;
return;
}
// Load the scripts into the ScriptSet and return
for (int32_t i = 0; i < script_count; i++) {
this->set(scripts[i], status);
if (U_FAILURE(status)) { return; }
}
}
/**
* Currently, getDouble() depends on strtod() to do its conversion.
*
* WARNING!!
* This is an extremely costly function. ~1/2 of the conversion time
* can be linked to this function.
*/
double
DigitList::getDouble() const
{
static char gDecimal = 0;
char decimalSeparator;
{
Mutex mutex;
if (fHave == kDouble) {
return fUnion.fDouble;
}
decimalSeparator = gDecimal;
}
if (decimalSeparator == 0) {
// We need to know the decimal separator character that will be used with strtod().
// Depends on the C runtime global locale.
// Most commonly is '.'
// TODO: caching could fail if the global locale is changed on the fly.
char rep[MAX_DIGITS];
sprintf(rep, "%+1.1f", 1.0);
decimalSeparator = rep[2];
}
double tDouble = 0.0;
if (isZero()) {
tDouble = 0.0;
if (decNumberIsNegative(fDecNumber)) {
tDouble /= -1;
}
} else if (isInfinite()) {
if (std::numeric_limits<double>::has_infinity) {
tDouble = std::numeric_limits<double>::infinity();
} else {
tDouble = std::numeric_limits<double>::max();
}
if (!isPositive()) {
tDouble = -tDouble; //this was incorrectly "-fDouble" originally.
}
} else {
MaybeStackArray<char, MAX_DBL_DIGITS+18> s;
// Note: 14 is a magic constant from the decNumber library documentation,
// the max number of extra characters beyond the number of digits
// needed to represent the number in string form. Add a few more
// for the additional digits we retain.
// Round down to appx. double precision, if the number is longer than that.
// Copy the number first, so that we don't modify the original.
if (getCount() > MAX_DBL_DIGITS + 3) {
DigitList numToConvert(*this);
numToConvert.reduce(); // Removes any trailing zeros, so that digit count is good.
numToConvert.round(MAX_DBL_DIGITS+3);
uprv_decNumberToString(numToConvert.fDecNumber, s.getAlias());
// TODO: how many extra digits should be included for an accurate conversion?
} else {
uprv_decNumberToString(this->fDecNumber, s.getAlias());
}
U_ASSERT(uprv_strlen(&s[0]) < MAX_DBL_DIGITS+18);
if (decimalSeparator != '.') {
char *decimalPt = strchr(s.getAlias(), '.');
if (decimalPt != NULL) {
*decimalPt = decimalSeparator;
}
}
char *end = NULL;
tDouble = uprv_strtod(s.getAlias(), &end);
}
{
Mutex mutex;
DigitList *nonConstThis = const_cast<DigitList *>(this);
nonConstThis->internalSetDouble(tDouble);
gDecimal = decimalSeparator;
}
return tDouble;
}