double integerFromString(const char *buf, int size, int radix)
{
if (size == 0)
return qt_qnan();
double sign = 1.0;
int i = 0;
if (buf[0] == '+') {
++i;
} else if (buf[0] == '-') {
sign = -1.0;
++i;
}
if (((size-i) >= 2) && (buf[i] == '0')) {
if (((buf[i+1] == 'x') || (buf[i+1] == 'X'))
&& (radix < 34)) {
if ((radix != 0) && (radix != 16))
return 0;
radix = 16;
i += 2;
} else {
if (radix == 0) {
radix = 8;
++i;
}
}
} else if (radix == 0) {
radix = 10;
}
int j = i;
for ( ; i < size; ++i) {
int d = toDigit(buf[i]);
if ((d == -1) || (d >= radix))
break;
}
double result;
if (j == i) {
if (!qstrcmp(buf, "Infinity"))
result = qInf();
else
result = qt_qnan();
} else {
result = 0;
double multiplier = 1;
for (--i ; i >= j; --i, multiplier *= radix)
result += toDigit(buf[i]) * multiplier;
}
result *= sign;
return result;
}
/*!
Returns the bit pattern of a quiet NaN as a double.
*/
Q_CORE_EXPORT double qQNaN() { return qt_qnan(); }
