auronandace
42 lines
1.4 KiB
Rust
42 lines
1.4 KiB
Rust
//! `assert.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/assert.h.html>.
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use crate::{
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c_str::CStr,
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platform::types::{c_char, c_int},
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};
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/assert.html>.
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///
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/// Writes information about the function that failed to `stderr` and calls
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/// `abort()`.
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///
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/// # Implementation
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/// `assert()` is defined as a C macro in cbindgen that checks for `NDEBUG`
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/// and if not found gets forwarded to this function call.
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///
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/// # Safety
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/// `func`, `file` and `cond` are guaranteed to be non-empty and valid.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn __assert_fail(
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func: *const c_char,
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file: *const c_char,
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line: c_int,
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cond: *const c_char,
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) -> ! {
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// SAFETY: `func` corresponds to the identifier `__func__` which is
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// guaranteed to be non-empty and valid.
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let func = unsafe { CStr::from_ptr(func) }.to_string_lossy();
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// SAFETY: `file` corresponds to the macro `__FILE__` which is guaranteed
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// to be non-empty and valid.
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let file = unsafe { CStr::from_ptr(file) }.to_string_lossy();
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// SAFETY: `cond` corresponds to the condition being asserted and is
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// guaranteed to be non-empty and valid.
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let cond = unsafe { CStr::from_ptr(cond) }.to_string_lossy();
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eprintln!("{}: {}:{}: Assertion `{}` failed.", func, file, line, cond);
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core::intrinsics::abort();
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}
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