Function asStringScanDouble

sdk/angelscript/source/as_string_util.cpp:77–161

}

double asStringScanDouble(const char *string, size_t *numScanned)
{
	// I decided to do my own implementation of strtod() because this function
	// doesn't seem to be present on all systems. iOS 5 for example doesn't appear 
	// to include the function in the standard lib.
	
	// Another reason is that the standard implementation of strtod() is dependent
	// on the locale on some systems, i.e. it may use comma instead of dot for 
	// the decimal indicator. This can be avoided by forcing the locale to "C" with
	// setlocale(), but this is another thing that is highly platform dependent.

	double value = 0;
	double fraction = 0.1;
	int exponent = 0;
	bool negativeExponent = false;
	int c = 0;

	// The tokenizer separates the sign from the number in   
	// two tokens so we'll never have a sign to parse here

	// Parse the integer value
	for( ;; )
	{
		if( string[c] >= '0' && string[c] <= '9' )
			value = value*10 + double(string[c] - '0');
		else 
			break;

		c++;
	}

	if( string[c] == '.' )
	{
		c++;

		// Parse the fraction
		for( ;; )
		{
			if( string[c] >= '0' && string[c] <= '9' )
				value += fraction * double(string[c] - '0');
			else
				break;

			c++;
			fraction *= 0.1;
		}
	}

	if( string[c] == 'e' || string[c] == 'E' )
	{
		c++;

		// Parse the sign of the exponent
		if( string[c] == '-' )
		{
			negativeExponent = true;
			c++;
		}