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Update FFI tutorial to reference c_str::to_c_str #8692

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Update FFI tutorial to reference c_str::to_c_str #8692

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5 changes: 2 additions & 3 deletions doc/tutorial-ffi.md
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Expand Up @@ -445,9 +445,8 @@ prefer using raw pointers (`*`) if that's needed because the compiler can't make
about them.

Vectors and strings share the same basic memory layout, and utilities are available in the `vec` and
`str` modules for working with C APIs. Strings are terminated with `\0` for interoperability with C,
but it should not be assumed because a slice will not always be nul-terminated. Instead, the
`str::as_c_str` function should be used.
`str` modules for working with C APIs. However, strings are not terminated with `\0`. If you need a
NUL-terminated string for interoperability with C, you should use the `c_str::to_c_str` function.

The standard library includes type aliases and function definitions for the C standard library in
the `libc` module, and Rust links against `libc` and `libm` by default.