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auto merge of #8692 : kballard/rust/ffi-tutorial-c_str, r=huonw

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The FFI tutorial still incorrectly stated that strings were terminated
with
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bors 2013-08-23 06:31:19 -07:00
commit 943f9aaa4a
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doc/tutorial-ffi.md
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@ -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.