auronandace
37 lines
1.2 KiB
Rust
37 lines
1.2 KiB
Rust
use crate::platform::types::c_char;
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/// An abstraction over a byte literal to provide a method to convert safely
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/// to a `c_char`.
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///
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/// The abstraction is required so we can contain architecture specific code
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/// in a central location.
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pub struct ByteLiteral;
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impl ByteLiteral {
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/// Casts a byte literal (`u8`) to a `c_char` without using `as`.
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///
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/// # Panics
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/// If `input` is not within the following range of ascii characters:
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/// - Octal: `040`..=`176`
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/// - Decimal: `30`..=`126`
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/// - Hexadecimal: `20`..=`7E`
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/// - Byte literals: b` `..=b`~`
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pub fn cast_cchar(input: u8) -> c_char {
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match input {
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b' '..=b'~' => {
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// `c_char` is an `i8` on these arches
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#[cfg(any(target_arch = "x86_64", target_arch = "x86"))]
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{
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input.cast_signed()
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}
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// `c_char` is already a `u8` on these arches
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#[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
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{
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input.into()
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}
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}
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_ => panic!("Not a printable ascii character!"),
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}
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}
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}
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