Function mupdf_sys::fz_append_vprintf

pub unsafe extern "C" fn fz_append_vprintf(
    ctx: *mut fz_context,
    buffer: *mut fz_buffer,
    fmt: *const c_char,
    args: *mut __va_list_tag
)

fz_append_vprintf: Format and append data to buffer using printf-like formatting with varargs (see fz_vsnprintf).