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fix: stack overflow in table.concat function #526

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fix: stack overflow in table.concat function #526

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9 changes: 4 additions & 5 deletions tablelib.go
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Original file line number Diff line number Diff line change
Expand Up @@ -66,19 +66,18 @@ func tableConcat(L *LState) int {
L.Push(emptyLString)
return 1
}
//TODO should flushing?
retbottom := L.GetTop()
result := ""
for ; i <= j; i++ {
v := tbl.RawGetInt(i)
if !LVCanConvToString(v) {
L.RaiseError("invalid value (%s) at index %d in table for concat", v.Type().String(), i)
}
L.Push(v)
result += LVAsString(v)
if i != j {
L.Push(sep)
result += LVAsString(sep)
}
}
L.Push(stringConcat(L, L.GetTop()-retbottom, L.reg.Top()-1))
L.Push(LString(result))
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Worth considering go lang string builder? https://pkg.go.dev/strings#Builder ?

return 1
}

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