#c-str #transparent #nul #ffi #no-alloc

no-std seasick

FFI-safe nul-terminated strings with ownership semantics

1 unstable release

0.1.0 Nov 30, 2024

#2381 in Rust patterns

Download history 146/week @ 2024-11-29 23/week @ 2024-12-06

169 downloads per month

Apache-2.0 OR MIT

26KB
561 lines

FFI-safe types for writing and transcribing C APIs.

&CStr and CString are not FFI safe.

#[deny(improper_ctypes)]
extern "C" {
    fn concat(_: &CStr, _: &CStr) -> CString;
}

&SeaStr and SeaString are FFI-safe equivalents.

extern "C" {
    fn concat(_: &SeaStr, _: &SeaStr) -> SeaString;
}

They use the non-null niche which is filled by Option::None.

/** may return null */
char *foo(void);
extern "C" fn foo() -> Option<SeaString> { .. }
assert_eq!(size_of::<Option<SeaString>>(), size_of::<*mut c_char>());

SeaBox is an additional owned pointer type, with a pluggable Allocator.


lib.rs:

FFI-safe types for writing and transcribing C APIs.

&CStr and CString are not FFI safe.

#[deny(improper_ctypes)]
extern "C" {
    fn concat(_: &CStr, _: &CStr) -> CString;
}

&SeaStr and SeaString are FFI-safe equivalents.

extern "C" {
    fn concat(_: &SeaStr, _: &SeaStr) -> SeaString;
}

They use the non-null niche which is filled by Option::None.

/** may return null */
char *foo(void);
extern "C" fn foo() -> Option<SeaString> { .. }
assert_eq!(size_of::<Option<SeaString>>(), size_of::<*mut c_char>());

SeaBox is an additional owned pointer type, with a pluggable Allocator.

Dependencies

~43KB