Function mupdf_sys::fz_format_string

pub unsafe extern "C" fn fz_format_string(
    ctx: *mut fz_context, 
    user: *mut c_void, 
    emit: Option<unsafe extern "C" fn(ctx: *mut fz_context, user: *mut c_void, c: c_int)>, 
    fmt: *const c_char, 
    args: *mut __va_list_tag
)