Trait PlatformLibc 

pub trait PlatformLibc {
    // Required methods
    fn strlen(s: *const u8) -> usize;
    fn strcmp(s1: *const u8, s2: *const u8) -> c_int;
    fn strncmp(s1: *const u8, s2: *const u8, n: usize) -> c_int;
    fn strchr(s: *const u8, c: c_int) -> *mut u8;
    fn strncpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
    fn memcpy(dest: *mut c_void, src: *const c_void, n: usize) -> *mut c_void;
    fn memmove(dest: *mut c_void, src: *const c_void, n: usize) -> *mut c_void;
    fn memset(dest: *mut c_void, c: c_int, n: usize) -> *mut c_void;
    fn memcmp(s1: *const c_void, s2: *const c_void, n: usize) -> c_int;
    fn memchr(s: *const c_void, c: c_int, n: usize) -> *mut c_void;
    fn strtoul(nptr: *const u8, endptr: *mut *mut u8, base: c_int) -> c_ulong;
    fn errno_ptr() -> *mut c_int;
}

Standard C library functions needed by zenoh-pico on bare-metal targets.

Platforms with a C runtime (RTOS, POSIX) do NOT need to implement this.

Dispatch model (Phase 84.F4.6)

This trait is documentary only — it is NOT dispatched through by zpico-platform-shim or xrce-platform-shim. The C libraries resolve these symbols (strlen, memcpy, errno, …) at link time directly from #[unsafe(no_mangle)] extern "C" fn definitions in nros-baremetal-common, which bare-metal platform crates pull in via the libc-stubs feature:

  nros-baremetal-common = { ..., features = ["libc-stubs"] }

The trait is retained in this API surface so that a future shim refactor could route libc through typed Rust methods without changing consumers. Today, implementing PlatformLibc on a platform ZST would be pure documentation; the actual contract — “the linker can resolve strlen etc.” — is enforced at link time, not at compile time. No platform crate implements this trait in the current tree.

Required Methods

fn strlen(s: *const u8) -> usize

fn strcmp(s1: *const u8, s2: *const u8) -> c_int

fn strncmp(s1: *const u8, s2: *const u8, n: usize) -> c_int

fn strchr(s: *const u8, c: c_int) -> *mut u8

fn strncpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8

fn memcpy(dest: *mut c_void, src: *const c_void, n: usize) -> *mut c_void

fn memmove(dest: *mut c_void, src: *const c_void, n: usize) -> *mut c_void

fn memset(dest: *mut c_void, c: c_int, n: usize) -> *mut c_void

fn memcmp(s1: *const c_void, s2: *const c_void, n: usize) -> c_int

fn memchr(s: *const c_void, c: c_int, n: usize) -> *mut c_void

fn strtoul(nptr: *const u8, endptr: *mut *mut u8, base: c_int) -> c_ulong

fn errno_ptr() -> *mut c_int

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors