Somehow we compiling and not crashing

os_unix.cpp

@@ -2,6 +2,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <time.h>
+#include <dirent.h>
 
 #define POSIX_PATH_MAX_KIND_OF 4096
 #define POSIX_PAGE_SIZE 4096
@@ -41,7 +42,12 @@ os_get_exe_dir(Allocator *a){
 
 function String
 os_get_absolute_path(Allocator *a, String path){
-  return ""_s;
+  char *buffer_out = exp_alloc_array(a, char, POSIX_PATH_MAX_KIND_OF);
+  assert(path.str[path.len] == 0);
+  realpath((char *)path.str, buffer_out);
+  // @memory @todo: If we allocated only 32 bytes here then deallocate rest
+
+  return string_from_cstring(buffer_out);
 }
 
 function B32
@@ -56,6 +62,41 @@ os_get_working_dir(Allocator *allocator){
   return string_from_cstring(result);
 }
 
+function Array<OS_File_Info>
+os_list_dir(Allocator *a, String dir, U32 flags = LIST_NO_FLAGS){
+  Scratch scratch(a);
+  Array<String> dirs_to_read = {scratch};
+  dirs_to_read.add(dir);
+
+  Array<OS_File_Info> result = {a};
+  for(auto it = dirs_to_read.begin(); it != dirs_to_read.end(); it++){
+    assert(it->str[it->len] == 0);
+    dirent *dir;
+    DIR *d = opendir((char *)it->str);
+    if(d){
+      while ((dir = readdir(d)) != NULL) {
+        if(dir->d_name[0] == '.'){
+          if(dir->d_name[1] == '.'){
+            if(dir->d_name[2] == 0)
+              continue;
+          }
+
+          if(dir->d_name[1] == 0)
+            continue;
+        }
+
+        OS_File_Info entry = {};
+        entry.relative_path = string_from_cstring(dir->d_name);
+        entry.absolute_path = os_get_absolute_path(a, entry.relative_path);
+        log_info("%Q\n", entry.absolute_path);
+      }
+      closedir(d);
+    }
+  }
+
+  return result;
+}
+
 function U8 *
 os_advance_commit(OS_Memory *m, size_t *commit_size, size_t page_size) {
   size_t aligned_up_commit                            = align_up(*commit_size, page_size);