[DGD] case conversion

[Robert Forshaw]

My case conversion function doesn't work.

string lower_case(string str)
{
	string ch;
	int count, len;

	if(str == nil || str == "") return "";

	len = strlen(str);

	for(count = 0; count < len; ch[0] = str[count++])
	{
		if(ch[0] > 64 && ch[0] < 97) str[count] = ch[0] + 32;
	}

	return str;
}

I've observed (incorrectly?) that the only way to refer to a char rather 
than a string is to refer to an element of a string (all other drivers I've 
seen return a string with a single char). I'm assuming that you can also 
manipulate and compare a char as if it were an 8 bit integer, in order to 
modify its case. Are these assumptions correct? Incidently, the lower_case() 
function gets the following error:
"Index on bad type".

Any help would be appreciated.

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