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use crate::enums::k_option::KOption;
use crate::functions::getnum::getnum;
use crate::functions::getnumlimit::getnumlimit;
use crate::macros::lua_l_error::luaL_error;
use crate::macros::maxalign::MAXALIGN;
use crate::records::header::Header;
use core::ffi::c_char;
pub fn getoption(h: *mut Header, fmt: *mut *const c_char, size: *mut i32) -> KOption {
let opt = unsafe { **fmt as c_char };
unsafe {
*fmt = (*fmt).add(1);
}
unsafe {
*size = 0;
}
match opt as u8 as char {
'b' => {
unsafe {
*size = 1;
}
KOption::Kint
}
'B' => {
unsafe {
*size = 1;
}
KOption::Kuint
}
'h' => {
unsafe {
*size = 2;
}
KOption::Kint
}
'H' => {
unsafe {
*size = 2;
}
KOption::Kuint
}
'l' => {
unsafe {
*size = 8;
}
KOption::Kint
}
'L' => {
unsafe {
*size = 8;
}
KOption::Kuint
}
'j' => {
unsafe {
*size = 4;
}
KOption::Kint
}
'J' => {
unsafe {
*size = 4;
}
KOption::Kuint
}
'T' => {
unsafe {
*size = 4;
}
KOption::Kuint
}
'f' => {
unsafe {
*size = 4;
}
KOption::Kfloat
}
'd' => {
unsafe {
*size = 8;
}
KOption::Kfloat
}
'n' => {
unsafe {
*size = 8;
}
KOption::Kfloat
}
'i' => {
unsafe {
*size = getnumlimit(h, fmt, 4);
}
KOption::Kint
}
'I' => {
unsafe {
*size = getnumlimit(h, fmt, 4);
}
KOption::Kuint
}
's' => {
unsafe {
*size = getnumlimit(h, fmt, 4);
}
KOption::Kstring
}
'c' => {
unsafe {
*size = getnum(h, fmt, -1);
}
if unsafe { *size } == -1 {
luaL_error!(unsafe { (*h).L }, "missing size for format option 'c'");
}
KOption::Kchar
}
'z' => KOption::Kzstr,
'x' => {
unsafe {
*size = 1;
}
KOption::Kpadding
}
'X' => KOption::Kpaddalign,
' ' => KOption::Knop,
'<' => {
unsafe {
(*h).islittle = 1;
}
KOption::Knop
}
'>' => {
unsafe {
(*h).islittle = 0;
}
KOption::Knop
}
'=' => {
unsafe {
(*h).islittle = if cfg!(target_endian = "little") { 1 } else { 0 };
}
KOption::Knop
}
'!' => {
unsafe {
(*h).maxalign = getnumlimit(h, fmt, MAXALIGN);
}
KOption::Knop
}
_ => {
luaL_error!(
unsafe { (*h).L },
"invalid format option '{}'",
opt as u8 as char
);
unreachable!()
}
}
}