encoding_c_mem

Function encoding_mem_convert_utf16_to_utf8

source 
#[no_mangle]
pub unsafe extern "C" fn encoding_mem_convert_utf16_to_utf8(
    src: *const u16,
    src_len: usize,
    dst: *mut u8,
    dst_len: usize,
) -> usize
Expand description

Converts potentially-invalid UTF-16 to valid UTF-8 with errors replaced with the REPLACEMENT CHARACTER.

The length of the destination buffer must be at least the length of the source buffer times three.

Returns the number of bytes written.

§Panics

Panics if the destination buffer is shorter than stated above.

§Safety

If you want to convert into a &mut str, use convert_utf16_to_str() instead of using this function together with the unsafe method as_bytes_mut() on &mut str.

§Undefined behavior

UB ensues if src and src_len don’t designate a valid memory block, if src is NULL, if dst and dst_len don’t designate a valid memory block, if dst is NULL or if the two memory blocks overlap. (If src_len is 0, src may be bogus but still has to be non-NULL and aligned. Likewise for dst and dst_len.)