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lang: drop commented-out c_str! implementation variants

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This was an old version of a const-fn compatible checked c_str
implementation which was never enabled.

When we get rust 1.72, `CStr::from_bytes_with_nul` becomes usable in
const contexts.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2024-05-24 12:56:41 +02:00
parent 1d68cc33a3
commit 484f12f3aa
1 changed files with 0 additions and 28 deletions
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28
proxmox-lang/src/lib.rs
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@ -109,31 +109,3 @@ macro_rules! c_str {
unsafe { ::std::ffi::CStr::from_bytes_with_nul_unchecked(concat!($data, "\0").as_bytes()) }
}};
}
/*
// With rust 1.56 we can enable the `c_str!()` macro for const fns:
#[doc(hidden)]
#[allow(unconditional_panic)]
pub const fn illegal_c_string() {
[][0]
}
/// Assert that a static byte slice is a valid C string (has no zeros except at the very end),
/// and return it as a `&'static CStr`.
pub const fn checked_c_str(bytes: &'static [u8]) -> &'static std::ffi::CStr {
let mut i = 0;
while i < bytes.len() - 1 {
if bytes[i] == 0 {
illegal_c_string();
}
i += 1;
}
unsafe { std::mem::transmute::<_, &'static std::ffi::CStr>(bytes) }
}
#[macro_export]
macro_rules! c_str {
($data:expr) => { $crate::checked_c_str(concat!($data, "\0")) };
}
*/