Function push_char_to_mutable_buffer

datafusion/functions/src/strings.rs:632–648

(value_buffer: &mut MutableBuffer, c: char)

#[inline(always)]
fn push_char_to_mutable_buffer(value_buffer: &mut MutableBuffer, c: char) {
    let len = c.len_utf8();
    let old_len = value_buffer.len();
    value_buffer.reserve(len);

    // SAFETY: we reserved `len` bytes above, write valid UTF-8 into those
    // bytes, then update the initialized length to include them.
    unsafe {
        let dst = value_buffer.as_mut_ptr().add(old_len);
        if len == 1 {
            *dst = c as u8;
        } else {
            c.encode_utf8(std::slice::from_raw_parts_mut(dst, len));
        }
        value_buffer.set_len(old_len + len);
    }
}

/// Builder for a [`StringViewArray`].
///