diff --git a/ctru-sys/src/sys/libc.rs b/ctru-sys/src/sys/libc.rs
index b4d4a12..997744d 100644
--- a/ctru-sys/src/sys/libc.rs
+++ b/ctru-sys/src/sys/libc.rs
@@ -1,4 +1,4 @@
-pub const STDOUT_FILENO: i32 = 1;
+pub const STDOUT_FILENO: c_int = 1;
 
 #[repr(u8)]
 pub enum c_void {
@@ -6,7 +6,23 @@ pub enum c_void {
     __variant2,
 }
 
+pub type c_schar = i8;
+pub type c_uchar = u8;
+pub type c_char = u8;
+pub type c_short = i16;
+pub type c_ushort = u16;
+pub type c_int = i32;
+pub type c_uint = u32;
+pub type c_long = i32;
+pub type c_ulong = u32;
+pub type c_longlong = i64;
+pub type c_ulonglong = u64;
+
+pub type size_t = usize;
+pub type ssize_t = isize;
+
 extern "C" {
-    pub fn abort() -> !;
-    pub fn write(fd: i32, buf: *const c_void, count: usize) -> isize;
+    pub fn write(fd: c_int, buf: *const c_void, count: size_t) -> ssize_t;
+    pub fn memchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
+    pub fn memrchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
 }