4.2 Modifying, passing and returning strings

4.2.1 Use of Reference Arguments

4.2.2 Modifying a string in a C function

4.2.3 Passing a constant string

4.2.4 Returning a string via a buffer

4.2.5 Calling a C function that takes an array of strings

4.2.6 Foreign string encodings

4.2.7 Foreign string line terminators

4.2.8 Win32 API functions that handle strings

4.2.9 Mapping Nil to a Null Pointer

LispWorks Foreign Language Interface User Guide and Reference Manual - 7 Dec 2011