What I cannot find though is the guarantee that the buffer where the
String is converted to an UTF8 sequence is always null-terminated.
I very much suspect it is, and all my tests did find a null-terminated
string.
Question: Does anybody know for sure that the buffer is always
null-terminated? (a link to where I can check this would be most
appreciated)
I'm not 100% certain, but I think the compiler uses this function to
convert a String argument to a pointer:
/// Derive a UTF-8 pointer argument from a value string parameter.
public // COMPILER_INTRINSIC
func _convertConstStringToUTF8PointerArgument<
ToPointer : _Pointer
>(_ str: String) -> (AnyObject?, ToPointer) {
let utf8 = Array(str.utf8CString)
return _convertConstArrayToPointerArgument(utf8)
}
Source: Pointer.swift [1]
This in turn calls `String.utf8CString` [2], which indeed returns a
null-terminated string.
[1]:
https://github.com/apple/swift/blob/master/stdlib/public/core/Pointer.swift#L85-L92
[2]:
https://github.com/apple/swift/blob/master/stdlib/public/core/StringUTF8.swift#L383-L405
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