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c_char
source link: https://doc.rust-lang.org/stable/std/ffi/type.c_char.html
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pub type c_char = i8;Equivalent to C’s char type.
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.
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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