Mitigate misuse of Swift's pointer conversion feature #80
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This is a continuation of the work done in apple/swift#42002, addressing the exact same issues.
The family of
String(andFilePath) initializers that convert from C strings (null-terminated byte buffers) can be called with Swift arrays, which are converted toUnsafePointerarguments for C interoperability. However, when the array passed in to them violates the C string precondition of containing a zero byte, this can result in a buffer overflow.This PR overloads every such initializer with a version for
[CodeUnit]andinout CodeUnit, enforcing the null-terminated precondition. An overload for String is also added. The String overload may appear strictly useless, but it behaves differently than a direct copy when the source string contains an embedded null.Addresses rdar://91436410.