There's nothing special about Y=0. The Y can be anywhere outwith the string.
e.g.
substr('abc', 6, -4) = 'bc'
substr('abc', -5, 3) = 'a'
All substr functions should work this way. I wrote a c++ function to emulate
it.
String substr(const String &Str, int Start, int Len)
{
if (Str=="" || !Len) return "";
String S;
int StrLen = Str.Length();
if (Start < 0) Start = StrLen + Start + 1;
if (Len < 0) {Start += Len; Len = -Len;}
for (int i = std::max(1, Start); i <= StrLen && i < Start+Len; i++) S +=
Str[i];
return S;
}
// String is a windows wide string type
// I wrote it a while ago so it could probably be done gooder :-)
--
Sent from: http://sqlite.1065341.n5.nabble.com/
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