POSIX directory listing.

source/md_posix.c

@@ -1,5 +1,53 @@
+#include <dirent.h>
+#include <sys/stat.h>
+
+#define MD_IMPL_FileIterIncrement MD_POSIX_FileIterIncrement
+
 static MD_b32
-_MD_OS_IMPL_FileIter_Increment(MD_FileIter *it, MD_String8 path, MD_FileInfo *out_info)
+MD_POSIX_FileIterIncrement(MD_FileIter *it, MD_String8 path, MD_FileInfo *out_info)
 {
-    
-}
+    MD_b32 result = 0;
+
+    DIR *dir = (DIR *)(it->state);
+    if(dir == 0)
+    {
+        dir = opendir((char*)path.str);
+    }
+
+    struct dirent *dir_entry = 0;
+    if(dir && (dir_entry = readdir(dir)))
+    {
+        out_info->filename = MD_PushStringF("%s", dir_entry->d_name);
+        out_info->flags = 0;
+
+        if(path.size > 1 && path.str[path.size-1] == '/')
+        {
+            path.size -= 1;
+        }
+        MD_String8 cfile_path = MD_PushStringF("%.*s/%s", MD_StringExpand(path), dir_entry->d_name);
+
+        // NOTE(mal): On Linux, fstatat(2) would save us from doing path manipulation and avoid some race
+        //            conditions but we would need to make space for an extra directory file descriptor
+        //            inside MD_FileIter struct. We would also stop being POSIX-compliant.
+        struct stat st;
+        if(stat((char *)cfile_path.str, &st) == 0)
+        {
+            if((st.st_mode & S_IFMT) == S_IFDIR)
+            {
+                out_info->flags |= MD_FileFlag_Directory;
+            }
+            out_info->file_size = st.st_size;
+        }
+        result = 1;
+    }
+    else
+    {
+        closedir(dir);
+        dir = 0;
+        result = 0;
+    }
+
+    it->state = *(MD_u64 *)(&dir);
+
+    return result;
+}