Lots of hacking to make a very simple "ls" utility.

I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().

LibC/dirent.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "types.h"
+
+extern "C" {
+
+struct dirent {
+    ino_t d_ino;
+    off_t d_off;
+    unsigned short d_reclen;
+    unsigned char d_type;
+    char d_name[256];
+};
+
+struct DIR {
+    int fd;
+    dirent cur_ent;
+    char* buffer;
+    size_t buffer_size;
+    char* nextptr;
+};
+
+DIR* opendir(const char* name);
+dirent* readdir(DIR* dirp);
+
+}
+