start strtok

libuwuc/src/env.rs

@@ -1,17 +1,17 @@
 use core::{ffi::CStr, ptr::NonNull};
 
-use crate::{println, utils::SharedThinCstr};
+use crate::{println, utils::CStrRef};
 
 mod global {
     use core::{cell::UnsafeCell, ptr::NonNull};
 
-    use crate::utils::{SharedThinCstr, SyncUnsafeCell};
+    use crate::utils::{CStrRef, SyncUnsafeCell};
 
     use super::EnvP;
 
     static ENVP: SyncUnsafeCell<EnvP> = SyncUnsafeCell(UnsafeCell::new(EnvP(None)));
 
-    pub(super) unsafe fn init(envp: *mut Option<SharedThinCstr<'static>>) {
+    pub(super) unsafe fn init(envp: *mut Option<CStrRef<'static>>) {
         assert!((*ENVP.0.get()).0.is_none());
         *ENVP.0.get() = EnvP(Some(NonNull::new(envp).unwrap()));
     }
@@ -23,21 +23,21 @@ mod global {
     }
 }
 
-pub(crate) unsafe fn init(envp: *mut Option<SharedThinCstr<'static>>) {
+pub(crate) unsafe fn init(envp: *mut Option<CStrRef<'static>>) {
     global::init(envp);
 }
 
 #[derive(Clone, Copy)]
-struct EnvP(Option<NonNull<Option<SharedThinCstr<'static>>>>);
+struct EnvP(Option<NonNull<Option<CStrRef<'static>>>>);
 
 unsafe impl Sync for EnvP {}
 
 impl Iterator for EnvP {
-    type Item = SharedThinCstr<'static>;
+    type Item = CStrRef<'static>;
 
     fn next(&mut self) -> Option<Self::Item> {
         unsafe {
-            let value: Option<SharedThinCstr<'static>> = self.0.unwrap().as_ptr().read();
+            let value: Option<CStrRef<'static>> = self.0.unwrap().as_ptr().read();
 
             value.map(|value| {
                 self.0 = Some(NonNull::new_unchecked(self.0.unwrap().as_ptr().add(1)));
@@ -57,11 +57,11 @@ pub(crate) fn debug_env() {
     println!("end vars");
 }
 
-pub fn getenv(name: SharedThinCstr<'_>) -> Option<SharedThinCstr<'static>> {
+pub fn getenv(name: CStrRef<'_>) -> Option<CStrRef<'static>> {
     getenv_inner(global::get(), name)
 }
 
-fn getenv_inner(mut envp: EnvP, name: SharedThinCstr<'_>) -> Option<SharedThinCstr<'static>> {
+fn getenv_inner(mut envp: EnvP, name: CStrRef<'_>) -> Option<CStrRef<'static>> {
     let mut eq_idx = 0;
     envp.find(|env| {
         // Find ENV
@@ -99,7 +99,7 @@ mod tests {
     use std::string::ToString;
     use std::{ffi::CString, vec::Vec};
 
-    use crate::utils::{cstr, SharedThinCstr};
+    use crate::utils::{cstr, CStrRef};
 
     use super::EnvP;
 
@@ -109,9 +109,9 @@ mod tests {
             .map(|s| CString::new(s.to_string()).unwrap())
             .collect::<Vec<_>>();
 
-        let mut envs: Vec<Option<SharedThinCstr<'static>>> = cstrs
+        let mut envs: Vec<Option<CStrRef<'static>>> = cstrs
             .iter()
-            .map(|cstr| unsafe { Some(SharedThinCstr::from_raw(cstr.as_ptr() as _)) })
+            .map(|cstr| unsafe { Some(CStrRef::from_raw(cstr.as_ptr() as _)) })
             .collect();
         envs.push(None);
 

libuwuc/src/fmt/parse.rs

@@ -1,10 +1,10 @@
 use core::ffi::{c_int, c_long};
 
-use crate::{error::Error, utils::SharedThinCstr};
+use crate::{error::Error, utils::CStrRef};
 
 pub fn parse_long<'a>(
-    str: SharedThinCstr<'a>,
-    endptr: Option<&mut Option<SharedThinCstr<'a>>>,
+    str: CStrRef<'a>,
+    endptr: Option<&mut Option<CStrRef<'a>>>,
     base: c_int,
 ) -> Result<c_long, Error> {
     if base != 10 {
@@ -83,9 +83,9 @@ pub fn parse_long<'a>(
 
 #[cfg(test)]
 mod tests {
-    use crate::{cstr, utils::SharedThinCstr};
+    use crate::{cstr, utils::CStrRef};
 
-    fn test_strtol(str: SharedThinCstr<'_>, expected: i64, base: i32, parsed_len: usize) {
+    fn test_strtol(str: CStrRef<'_>, expected: i64, base: i32, parsed_len: usize) {
         let mut end = None;
         let result = super::parse_long(str, Some(&mut end), base).unwrap();
         assert_eq!(result, expected);

libuwuc/src/fmt/printf.rs

@@ -1,10 +1,10 @@
 use core::ffi::VaList;
 
-use crate::{io::IoWrite, utils::SharedThinCstr, error::Error};
+use crate::{io::IoWrite, utils::CStrRef, error::Error};
 
 pub unsafe fn printf_generic(
     mut sink: impl IoWrite,
-    format: SharedThinCstr<'_>,
+    format: CStrRef<'_>,
     mut args: VaList<'_, '_>,
 ) -> Result<(), Error> {
     let mut chars = format.into_iter();
@@ -47,11 +47,11 @@ mod tests {
     use std::string::String;
     use std::vec::Vec;
 
-    use crate::utils::{cstr, SharedThinCstr};
+    use crate::utils::{cstr, CStrRef};
 
     use super::printf_generic;
 
-    unsafe extern "C" fn test_printf(expected: &str, fmt: SharedThinCstr<'_>, mut args: ...) {
+    unsafe extern "C" fn test_printf(expected: &str, fmt: CStrRef<'_>, mut args: ...) {
         let mut sink = Vec::new();
 
         printf_generic(&mut sink, fmt, args.as_va_list()).unwrap();

libuwuc/src/io/fd.rs

@@ -1,17 +1,17 @@
 use crate::{
     error::{Error, SyscallResultExt},
-    utils::SharedThinCstr,
+    utils::CStrRef,
 };
 
 #[derive(Clone, Copy)]
 #[repr(transparent)]
 pub struct Fd(pub i32);
 
-pub fn open(arg: SharedThinCstr<'_>, flags: i32) -> Result<Fd, Error> {
+pub fn open(arg: CStrRef<'_>, flags: i32) -> Result<Fd, Error> {
     sys_open(arg, flags)
 }
 
-pub fn sys_open(arg: SharedThinCstr<'_>, flags: i32) -> Result<Fd, Error> {
+pub fn sys_open(arg: CStrRef<'_>, flags: i32) -> Result<Fd, Error> {
     unsafe {
         crate::syscall::syscall!(crate::syscall::SYS_OPEN, arg.as_raw(), flags).syscall_resultify()
     }

libuwuc/src/io/stream/file.rs

@@ -1,4 +1,4 @@
-use crate::{io::fd, utils::SharedThinCstr};
+use crate::{io::fd, utils::CStrRef};
 
 #[derive(Debug, PartialEq)]
 pub enum OpenMode {
@@ -22,7 +22,7 @@ impl OpenMode {
         }
     }
 
-    pub fn parse(str: SharedThinCstr<'_>) -> Result<OpenMode, &'static str> {
+    pub fn parse(str: CStrRef<'_>) -> Result<OpenMode, &'static str> {
         let mut buf = [0; 2];
         let mut i = 0;
 

libuwuc/src/io/stream/mod.rs

@@ -4,7 +4,7 @@ use crate::{
     alloc,
     error::Error,
     io::{fd, stream::file::OpenMode},
-    utils::SharedThinCstr,
+    utils::CStrRef,
 };
 
 use super::{fd::Fd, IoWrite, EOF};
@@ -32,8 +32,8 @@ impl IoWrite for &FileStream {
 }
 
 pub unsafe fn fopen<'a>(
-    pathname: SharedThinCstr<'_>,
-    mode: SharedThinCstr<'_>,
+    pathname: CStrRef<'_>,
+    mode: CStrRef<'_>,
 ) -> Result<&'a FileStream, Error> {
     let Ok(mode) = OpenMode::parse(mode) else {
         return Err(Error::INVAL);

libuwuc/src/lib.rs

@@ -16,6 +16,7 @@ pub mod io;
 pub mod mem;
 pub mod misc;
 pub mod start;
+pub mod string;
 mod stubs;
 mod sys;
 pub mod utils;

libuwuc/src/mem.rs

@@ -1,4 +1,4 @@
-use crate::utils::SharedThinCstr;
+use crate::utils::CStrRef;
 
 #[inline]
 pub unsafe fn memset(ptr: *mut u8, constant: u8, len: usize) {
@@ -59,13 +59,13 @@ pub unsafe fn memcmp(s1: *const u8, s2: *const u8, size: usize) -> i32 {
 }
 
 #[inline]
-pub unsafe fn strcmp(s1: SharedThinCstr<'_>, s2: SharedThinCstr<'_>) -> i32 {
+pub unsafe fn strcmp(s1: CStrRef<'_>, s2: CStrRef<'_>) -> i32 {
     s1.into_iter().cmp(s2) as i8 as i32
 }
 
 // This technically violates the safety precondition of SharedThinCstr but that's fine, we're careful.
 #[inline]
-pub unsafe fn strncmp(s1: SharedThinCstr<'_>, s2: SharedThinCstr<'_>, size: usize) -> i32 {
+pub unsafe fn strncmp(s1: CStrRef<'_>, s2: CStrRef<'_>, size: usize) -> i32 {
     s1.into_iter().take(size).cmp(s2.into_iter().take(size)) as i8 as i32
 }
 
@@ -81,7 +81,7 @@ pub unsafe fn strlen(mut s: *const u8) -> usize {
 
 #[cfg(test)]
 mod tests {
-    use crate::{cstr, utils::SharedThinCstr};
+    use crate::{cstr, utils::CStrRef};
 
     #[test]
     fn memcpy_null() {
@@ -270,8 +270,8 @@ mod tests {
     #[test]
     fn strncmp_no_null_term() {
         // Note: this is violating the safety invariant of SharedThinCstr but thats fine, we're careful.
-        let a = unsafe { SharedThinCstr::from_raw(b"0000".as_ptr()) };
-        let b = unsafe { SharedThinCstr::from_raw(b"0001".as_ptr()) };
+        let a = unsafe { CStrRef::from_raw(b"0000".as_ptr()) };
+        let b = unsafe { CStrRef::from_raw(b"0001".as_ptr()) };
         let result = unsafe { super::strncmp(a, b, 4) };
         assert_eq!(result, -1);
     }

libuwuc/src/misc.rs

@@ -1,11 +1,11 @@
-use crate::utils::SharedThinCstr;
+use crate::utils::CStrRef;
 use core::fmt::Write;
 
 pub fn assert_failed(
-    assertion: SharedThinCstr<'_>,
-    file: SharedThinCstr<'_>,
+    assertion: CStrRef<'_>,
+    file: CStrRef<'_>,
     line: u32,
-    _function: Option<SharedThinCstr<'_>>,
+    _function: Option<CStrRef<'_>>,
 ) -> ! {
     let _ = writeln!(
         crate::io::Printer(crate::io::STDERR),

libuwuc/src/start.rs

@@ -1,13 +1,13 @@
 use core::ffi::{c_char, c_int};
 
-use crate::utils::SharedThinCstr;
+use crate::utils::CStrRef;
 
 /// The entrypoint of the program.
 /// This is called by a bit of assembly handling architecture-specific _start.
 pub(crate) unsafe extern "C" fn start(rsp: u64) -> ! {
     let argc = (rsp as *const u64).read();
     let argv = (rsp + 8) as *const *const c_char;
-    let envp = (8 + 8 * argc + rsp + 8) as *mut Option<SharedThinCstr<'static>>;
+    let envp = (8 + 8 * argc + rsp + 8) as *mut Option<CStrRef<'static>>;
 
     crate::env::init(envp);
 

libuwuc/src/string.rs

@@ -0,0 +1,59 @@
+use crate::utils::CStrRef;
+
+pub unsafe fn strtok(str: *mut u8, delim: CStrRef<'_>, saveptr: *mut *mut u8) -> *const u8 {
+    if !str.is_null() {
+        saveptr.write(str);
+    }
+    let start = saveptr.read();
+
+    let mut end = saveptr.read();
+    while end.read() != 0 || !delim.into_iter().any(|c| c == end.read()) {
+        end = end.add(1);
+    }
+
+    end.write(0);
+
+    if start == end {
+        core::ptr::null()
+    } else {
+        start
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    extern crate std;
+    use std::borrow::ToOwned;
+    use std::vec::Vec;
+
+    use crate::{cstr, utils::CStrRef};
+
+    fn test_strtok(string: &str, delim: CStrRef<'_>, expected: &[CStrRef<'_>]) {
+        unsafe {
+            let mut str = string.to_owned().into_bytes();
+            str.push(0);
+
+            let mut saveptr = core::ptr::null_mut();
+
+            let mut out = Vec::new();
+            loop {
+                let s = super::strtok(str.as_mut_ptr(), delim, &mut saveptr);
+                if s.is_null() {
+                    break;
+                }
+                out.push(CStrRef::from_raw(s));
+            }
+
+            assert_eq!(out, expected);
+        }
+    }
+
+    #[test]
+    fn strtok_manpage_example() {
+        test_strtok(
+            "a/bbb///cc;xxxx:yyy:",
+            cstr!(":;"),
+            &[cstr!("a/bbbb///cc"), cstr!("xxx"), cstr!("yyy")],
+        );
+    }
+}

libuwuc/src/utils/mod.rs

@@ -2,13 +2,13 @@ use core::{cell::UnsafeCell, ffi::CStr, fmt::Debug, marker::PhantomData, ptr::No
 
 #[repr(transparent)]
 #[derive(Default)]
-pub(crate) struct SyncUnsafeCell<T>(pub(crate) UnsafeCell<T>);
+pub struct SyncUnsafeCell<T>(pub UnsafeCell<T>);
 
 unsafe impl<T: Sync> Sync for SyncUnsafeCell<T> {}
 
 #[derive(Clone, Copy)]
 #[repr(transparent)]
-pub struct SharedThinCstr<'a>(NonNull<u8>, PhantomData<&'a CStr>);
+pub struct CStrRef<'a>(NonNull<u8>, PhantomData<&'a CStr>);
 
 #[macro_export]
 macro_rules! cstr {
@@ -16,14 +16,14 @@ macro_rules! cstr {
         let s = concat!($value, "\0");
         #[allow(unused_unsafe)]
         unsafe {
-            $crate::utils::SharedThinCstr::from_raw(s.as_ptr().cast())
+            $crate::utils::CStrRef::from_raw(s.as_ptr().cast())
         }
     }};
 }
 
 pub use cstr;
 
-impl<'a> SharedThinCstr<'a> {
+impl<'a> CStrRef<'a> {
     pub unsafe fn from_raw(ptr: *const u8) -> Self {
         Self(NonNull::new_unchecked(ptr as *mut u8), PhantomData)
     }
@@ -50,7 +50,7 @@ impl<'a> SharedThinCstr<'a> {
     }
 }
 
-impl<'a> IntoIterator for SharedThinCstr<'a> {
+impl<'a> IntoIterator for CStrRef<'a> {
     type Item = u8;
 
     type IntoIter = CStrIter<'a>;
@@ -60,7 +60,7 @@ impl<'a> IntoIterator for SharedThinCstr<'a> {
     }
 }
 
-pub struct CStrIter<'a>(SharedThinCstr<'a>);
+pub struct CStrIter<'a>(CStrRef<'a>);
 
 impl<'a> Iterator for CStrIter<'a> {
     type Item = u8;
@@ -78,10 +78,10 @@ impl<'a> Iterator for CStrIter<'a> {
     }
 }
 
-unsafe impl<'a> Send for SharedThinCstr<'a> {}
-unsafe impl<'a> Sync for SharedThinCstr<'a> {}
+unsafe impl<'a> Send for CStrRef<'a> {}
+unsafe impl<'a> Sync for CStrRef<'a> {}
 
-impl<'a> Debug for SharedThinCstr<'a> {
+impl<'a> Debug for CStrRef<'a> {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         let str = <&CStr>::from(*self).to_str();
         match str {
@@ -91,22 +91,22 @@ impl<'a> Debug for SharedThinCstr<'a> {
     }
 }
 
-impl<'a> From<SharedThinCstr<'a>> for &'a CStr {
-    fn from(value: SharedThinCstr<'a>) -> Self {
+impl<'a> From<CStrRef<'a>> for &'a CStr {
+    fn from(value: CStrRef<'a>) -> Self {
         unsafe { CStr::from_ptr(value.0.as_ptr().cast()) }
     }
 }
 
-impl<'a> PartialEq for SharedThinCstr<'a> {
+impl<'a> PartialEq for CStrRef<'a> {
     fn eq(&self, other: &Self) -> bool {
         self.into_iter().eq(*other)
     }
 }
 
-impl<'a> Eq for SharedThinCstr<'a> {}
+impl<'a> Eq for CStrRef<'a> {}
 
 #[repr(transparent)]
-pub(crate) struct SyncPtr<T>(pub(crate) *mut T);
+pub struct SyncPtr<T>(pub *mut T);
 
 unsafe impl<T> Send for SyncPtr<T> {}
 unsafe impl<T> Sync for SyncPtr<T> {}

rawc/src/fcntl.rs

@@ -1,6 +1,6 @@
-use libuwuc::{error::IntoOkOrErrno, utils::SharedThinCstr, io::fd::Fd};
+use libuwuc::{error::IntoOkOrErrno, utils::CStrRef, io::fd::Fd};
 
 #[no_mangle]
-pub unsafe extern "C" fn open(path: SharedThinCstr<'_>, flags: i32) -> Fd {
+pub unsafe extern "C" fn open(path: CStrRef<'_>, flags: i32) -> Fd {
     libuwuc::io::fd::open(path, flags).into_ok_or_errno()
 }

rawc/src/rt.rs

@@ -1,6 +1,6 @@
 use core::ffi::c_uint;
 
-use libuwuc::utils::SharedThinCstr;
+use libuwuc::utils::CStrRef;
 
 #[no_mangle]
 pub extern "C" fn __stack_chk_fail() -> ! {
@@ -23,9 +23,9 @@ pub unsafe extern "C" fn __assert_fail(
     function: *const u8,
 ) -> ! {
     libuwuc::misc::assert_failed(
-        SharedThinCstr::from_raw(assertion),
-        SharedThinCstr::from_raw(file),
+        CStrRef::from_raw(assertion),
+        CStrRef::from_raw(file),
         line,
-        SharedThinCstr::from_nullable(function),
+        CStrRef::from_nullable(function),
     )
 }

rawc/src/stdio.rs

@@ -3,7 +3,7 @@ use core::ffi::{c_char, c_int};
 use libuwuc::{
     error::IntoOkOrErrno,
     io::{stream::FileStream, traits::WriteCounter, STDERR, STDIN, STDOUT},
-    utils::SharedThinCstr,
+    utils::CStrRef,
 };
 
 #[no_mangle]
@@ -24,7 +24,7 @@ pub unsafe extern "C" fn __printf_chk(_flag: c_int, format: *const u8, mut args:
 
     let result = libuwuc::fmt::printf::printf_generic(
         &mut sink,
-        SharedThinCstr::from_raw(format),
+        CStrRef::from_raw(format),
         args.as_va_list(),
     );
 
@@ -37,7 +37,7 @@ pub unsafe extern "C" fn printf(format: *const u8, mut args: ...) -> c_int {
 
     let result = libuwuc::fmt::printf::printf_generic(
         &mut sink,
-        SharedThinCstr::from_raw(format),
+        CStrRef::from_raw(format),
         args.as_va_list(),
     );
 
@@ -55,7 +55,7 @@ pub unsafe extern "C" fn __fprintf_chk(
 
     let result = libuwuc::fmt::printf::printf_generic(
         &mut sink,
-        SharedThinCstr::from_raw(format),
+        CStrRef::from_raw(format),
         args.as_va_list(),
     );
 
@@ -68,7 +68,7 @@ pub unsafe extern "C" fn fprintf(file: &FileStream, format: *const u8, mut args:
 
     let result = libuwuc::fmt::printf::printf_generic(
         &mut sink,
-        SharedThinCstr::from_raw(format),
+        CStrRef::from_raw(format),
         args.as_va_list(),
     );
 
@@ -86,8 +86,8 @@ pub static stderr: &FileStream = &FileStream::from_raw_fd(STDERR);
 
 #[no_mangle]
 pub unsafe extern "C" fn fopen<'a>(
-    pathname: SharedThinCstr<'_>,
-    mode: SharedThinCstr<'_>,
+    pathname: CStrRef<'_>,
+    mode: CStrRef<'_>,
 ) -> Option<&'a FileStream> {
     libuwuc::io::stream::fopen(pathname, mode)
         .map_err(|err| libuwuc::error::set_errno(err.0))

rawc/src/stdlib.rs

@@ -1,6 +1,6 @@
 use core::ffi::{c_int, c_long};
 
-use libuwuc::{error::IntoOkOrErrno, utils::SharedThinCstr};
+use libuwuc::{error::IntoOkOrErrno, utils::CStrRef};
 
 // Allocation functions
 
@@ -35,10 +35,10 @@ pub unsafe extern "C" fn reallocarray(ptr: *mut u8, nmemb: usize, size: usize) -
 
 #[no_mangle]
 pub unsafe extern "C" fn strtol(nptr: *const u8, endptr: *mut *const u8, base: c_int) -> c_long {
-    let str = SharedThinCstr::from_raw(nptr);
+    let str = CStrRef::from_raw(nptr);
     libuwuc::fmt::parse::parse_long(
         str,
-        core::mem::transmute::<*mut *const u8, Option<&mut Option<SharedThinCstr<'_>>>>(endptr),
+        core::mem::transmute::<*mut *const u8, Option<&mut Option<CStrRef<'_>>>>(endptr),
         base,
     )
     .into_ok_or_errno()
@@ -53,8 +53,8 @@ pub unsafe extern "C" fn strtoll(nptr: *const u8, endptr: *mut *const u8, base:
 
 #[no_mangle]
 pub unsafe extern "C" fn getenv(name: *const u8) -> *const u8 {
-    libuwuc::env::getenv(SharedThinCstr::from_raw(name))
-        .map(SharedThinCstr::as_raw)
+    libuwuc::env::getenv(CStrRef::from_raw(name))
+        .map(CStrRef::as_raw)
         .unwrap_or(core::ptr::null())
 }
 

rawc/src/string.rs

@@ -1,4 +1,9 @@
-use libuwuc::{error::Error, utils::SharedThinCstr};
+use core::cell::UnsafeCell;
+
+use libuwuc::{
+    error::Error,
+    utils::{CStrRef, SyncPtr, SyncUnsafeCell},
+};
 
 #[no_mangle]
 pub unsafe extern "C" fn memset(ptr: *mut u8, constant: u8, len: usize) {
@@ -26,13 +31,13 @@ pub unsafe extern "C" fn bcmp(s1: *const u8, s2: *const u8, size: usize) -> i32
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn strcmp(s1: SharedThinCstr<'_>, s2: SharedThinCstr<'_>) -> i32 {
+pub unsafe extern "C" fn strcmp(s1: CStrRef<'_>, s2: CStrRef<'_>) -> i32 {
     libuwuc::mem::strcmp(s1, s2)
 }
 
 // This technically violates the safety precondition of SharedThinCstr but that's fine, we're careful.
 #[no_mangle]
-pub unsafe extern "C" fn strncmp(s1: SharedThinCstr<'_>, s2: SharedThinCstr<'_>, n: usize) -> i32 {
+pub unsafe extern "C" fn strncmp(s1: CStrRef<'_>, s2: CStrRef<'_>, n: usize) -> i32 {
     libuwuc::mem::strncmp(s1, s2, n)
 }
 
@@ -47,3 +52,20 @@ pub unsafe extern "C" fn strerror(errnum: Error) -> *const u8 {
         .map(str::as_ptr)
         .unwrap_or(core::ptr::null())
 }
+
+static STRTOK_GLOBAL: SyncUnsafeCell<SyncPtr<u8>> =
+    SyncUnsafeCell(UnsafeCell::new(SyncPtr(core::ptr::null_mut())));
+
+#[no_mangle]
+pub unsafe extern "C" fn strtok(str: *mut u8, delim: *const u8) -> *const u8 {
+    strtok_r(str, delim, STRTOK_GLOBAL.0.get().cast::<*const u8>())
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn strtok_r<'a>(
+    str: *mut u8,
+    delim: *const u8,
+    saveptr: *mut *const u8,
+) -> *const u8 {
+    todo!()
+}