encoding_c

Function encoding_iso_2022_jp_ascii_valid_up_to

source 
#[no_mangle]
pub unsafe extern "C" fn encoding_iso_2022_jp_ascii_valid_up_to(
    buffer: *const u8,
    buffer_len: usize,
) -> usize
Expand description

Validates ISO-2022-JP ASCII-state data.

Returns the index of the first byte that makes the input not representable in the ASCII state of ISO-2022-JP or buffer_len if buffer is entirely representable in the ASCII state of ISO-2022-JP.

buffer must be non-NULL even if buffer_len is zero. When buffer_len is zero, it is OK for buffer to be something non-dereferencable, such as 0x1. This is required due to Rust’s optimization for slices within Option.

§Undefined behavior

UB ensues if buffer and buffer_len don’t designate a valid memory block of if buffer is NULL.