Function perry_str

native/watchos/src/lib.rs:40–50

Decode a Perry-side string pointer (i64 on this ABI) into a borrowed &str. Returns "" for null / too-small pointers to keep the FFI boundary robust.

(ptr: i64)

/// Decode a Perry-side string pointer (i64 on this ABI) into a borrowed &str.
/// Returns "" for null / too-small pointers to keep the FFI boundary robust.
fn perry_str<'a>(ptr: i64) -> &'a str {
    if ptr == 0 { return ""; }
    let p = ptr as *const u8;
    if (p as usize) < 0x1000 { return ""; }
    unsafe {
        let header = p as *const StringHeader;
        let len = (*header).byte_len as usize;
        let data = p.add(std::mem::size_of::<StringHeader>());
        std::str::from_utf8_unchecked(std::slice::from_raw_parts(data, len))
    }
}

/// Allocate a Perry-side heap string (StringHeader + UTF-8 payload) and return
/// its pointer as the i64 the FFI boundary expects. Mirrors `perry_str`'s