library/core/src/ffi/c_char.md

   1 Equivalent to C's `char` type.
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   3 [C's `char` type] is completely unlike [Rust's `char` type]; while Rust's type represents a unicode scalar value, C's `char` type is just an ordinary integer. On modern architectures this type will always be either [`i8`] or [`u8`], as they use byte-addresses memory with 8-bit bytes.
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   5 C chars are most commonly used to make C strings. Unlike Rust, where the length of a string is included alongside the string, C strings mark the end of a string with the character `'\0'`. See `CStr` for more information.
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   7 [C's `char` type]: https://en.wikipedia.org/wiki/C_data_types#Basic_types
   8 [Rust's `char` type]: char