A C string is a reference to an array of C characters terminated by NUL.

A string with explicit length information in bytes instead of a terminating NUL (allowing NUL characters in the middle of the string).

Marshal a NUL terminated C string into a Haskell string.

Marshal a C string with explicit length into a Haskell string.

Marshal a Haskell string into a NUL terminated C string.

• the Haskell string may not contain any NUL characters
• new storage is allocated for the C string and must be explicitly freed using free or finalizerFree.

Marshal a Haskell string into a C string (ie, character array) with explicit length information.

Note that this does not NUL terminate the resulting string.

• new storage is allocated for the C string and must be explicitly freed using free or finalizerFree.

Marshal a Haskell string into a NUL-terminated C string (ie, character array) with explicit length information.

• new storage is allocated for the C string and must be explicitly freed using free or finalizerFree.

@since base-4.19.0.0

Marshal a Haskell string into a NUL terminated C string using temporary storage.

• the Haskell string may not contain any NUL characters
• the memory is freed when the subcomputation terminates (either normally or via an exception), so the pointer to the temporary storage must not be used after this.

Marshal a Haskell string into a C string (ie, character array) in temporary storage, with explicit length information.

Note that this does not NUL terminate the resulting string.

• the memory is freed when the subcomputation terminates (either normally or via an exception), so the pointer to the temporary storage must not be used after this.

Marshal a Haskell string into a NUL-terminated C string (ie, character array) in temporary storage, with explicit length information.

• the memory is freed when the subcomputation terminates (either normally or via an exception), so the pointer to the temporary storage must not be used after this.

@since base-4.19.0.0

Marshal a list of Haskell strings into an array of NUL terminated C strings using temporary storage.

• the Haskell strings may not contain any NUL characters
• the memory is freed when the subcomputation terminates (either normally or via an exception), so the pointer to the temporary storage must not be used after this.

Determines whether a character can be accurately encoded in a CString.

Pretty much anyone who uses this function is in a state of sin because whether or not a character is encodable will, in general, depend on the context in which it occurs.