Day 1

stdlib/include/arena.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <common.h>
+
+typedef struct arena {
+	void* ptr;
+	usize available;
+	usize capacity;
+} arena;
+
+// The capacity has to be page-aligned
+arena arena_init(usize capacity);
+
+// The available size will be rounded up to a page boundary
+// Will not grow beyond its capacity
+void arena_ensure(arena* arena, usize available);
+
+#define ARENA_ENSURE(T, arena, available) arena_ensure(arena, (available) * sizeof(T))

stdlib/include/buffer.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <common.h>
+
+// The size has to be page-aligned
+void* buffer_init(usize size);

stdlib/include/common.h

@@ -0,0 +1,27 @@
+#pragma once
+
+typedef char c8;
+
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned int u32;
+typedef unsigned long u64;
+
+typedef signed char i8;
+typedef signed short i16;
+typedef signed int i32;
+typedef signed long i64;
+
+typedef unsigned long int usize;
+typedef signed long isize;
+
+#define asm __asm__
+
+#define null ((void*)0)
+#define bool _Bool
+#define false 0
+#define true 1
+
+#define COUNT(array) (sizeof(array) / sizeof(array[0]))
+
+#define PAGE_SIZE 4096UL

stdlib/include/syscall.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <common.h>
+
+#define stdin 0
+#define stdout 1
+#define stderr 2
+
+#define PROT_NONE 0x0
+#define PROT_READ 0x1
+#define PROT_WRITE 0x2
+#define PROT_EXEC 0x4
+
+#define MAP_SHARED 0x01
+#define MAP_PRIVATE 0x02
+#define MAP_FIXED 0x10
+#define MAP_ANONYMOUS 0x20
+
+isize read(i32 fd, void* buf, usize size);
+isize write(i32 fd, const void* buf, usize size);
+void* mmap(void* addr, usize length, i32 prot, i32 flags, i32 fd, isize offset);
+i32 mprotect(void* addr, usize len, i32 prot);
+i32 ftruncate(i32 fd, isize length);
+i32 memfd_create(const char* name, u32 flags);