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Turbo Pascal strings have a length byte in front. Since a byte has the range 0 .. 255, this limits a string to 255 characters. However, the Pascal string schema, as defined in section 6.4.3.3.3 of the ISO-10206: 1990 Extended Pascal standard, is a schema record:
type String (Capacity: Integer) = record Length: 0 .. Capacity; String: packed array [1 .. Capacity + 1] of Char end; |
The `+ 1' is a GPC extension to make it feasible to automatically add the `#0' terminator when passing or assigning them to CStrings. Thus at the expense of a little added complexity (must declare capacity, don't use `GetMem' without explicit initialization of the `Capacity' field, and the additional space requirement) you can now have very long strings.