ok,
Andreas somehow convinced me for this:
void octstr_url_encode(Octstr *ostr)
{
int i, n, newlen;
unsigned char *str, *str2, *hexits;
unsigned char c;
Octstr *res;
seems_valid(ostr);
if (ostr->immutable || ostr->len == 0)
return;
...
so if ostr is an immutable we simply bounce out as if it had 0 len.
Stipe
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