Update fs.

external/fs/fs.c

@@ -2105,8 +2105,15 @@ FS_API fs_result fs_mkdir(fs* pFS, const char* pPath)
     char* pRunningPath = pRunningPathStack;
     size_t runningPathLen = 0;
     fs_path_iterator iSegment;
+    const fs_backend* pBackend;
 
-    if (pFS == NULL || pPath == NULL) {
+    pBackend = fs_get_backend_or_default(pFS);
+
+    if (pBackend == NULL) {
+        return FS_INVALID_ARGS;
+    }
+
+    if (pPath == NULL) {
         return FS_INVALID_ARGS;
     }
 
@@ -2144,7 +2151,7 @@ FS_API fs_result fs_mkdir(fs* pFS, const char* pPath)
         runningPathLen += iSegment.segmentLength;
         pRunningPath[runningPathLen] = '\0';
 
-        result = fs_backend_mkdir(pFS->pBackend, pFS, pRunningPath);
+        result = fs_backend_mkdir(pBackend, pFS, pRunningPath);
 
         /* We just pretend to be successful if the directory already exists. */
         if (result == FS_ALREADY_EXISTS) {
@@ -3040,6 +3047,7 @@ FS_API fs_result fs_file_open_or_info(fs* pFS, const char* pFilePath, int openMo
         We'll need to iterate over every mount point and keep track of the mount point with the longest
         prefix that matches the start of the file path.
         */
+        if (pFS != NULL) {
             fs_mount_list_iterator iMountPoint;
             fs_mount_point* pBestMountPoint = NULL;
             const char* pBestMountPointPath = NULL;
@@ -3129,6 +3137,21 @@ FS_API fs_result fs_file_open_or_info(fs* pFS, const char* pFilePath, int openMo
             } else {
                 return FS_DOES_NOT_EXIST;   /* Couldn't find an appropriate mount point. */
             }
+        } else {
+            /*
+            No "fs" object was supplied. Open using the default backend without using mount points. This is as if you were
+            opening a file using `fopen()`.
+            */
+            if ((openMode & FS_ONLY_MOUNTS) == 0) {
+                return fs_file_alloc_if_necessary_and_open_or_info(pFS, pFilePath, openMode, ppFile, pInfo);
+            } else {
+                /*
+                Getting here means only the mount points can be used to open the file (cannot open straight from
+                the file system natively).
+                */
+                return FS_DOES_NOT_EXIST;
+            }
+        }
     } else {
         /* Opening in read mode. */
         fs_mount_list_iterator iMountPoint;

external/fs/fs.h

@@ -267,9 +267,14 @@ be saved:
 
 ```c
 fs_file_open(pFS, "config/game.cfg", FS_WRITE, &pFile); // Prefixed with "config", so will use the "config" mount point.
-fs_file_open(pFs, "saves/save0.sav", FS_WRITE, &pFile); // Prefixed with "saves", so will use the "saves" mount point.
+fs_file_open(pFS, "saves/save0.sav", FS_WRITE, &pFile); // Prefixed with "saves", so will use the "saves" mount point.
 ```
 
+When opening a file for writing, if you pass in NULL for the `pFS` parameter it will open the file
+like normal using the standard file system. That is it'll work exactly as if you were using stdio
+`fopen()` and you will not be able use mount points. Keep in mind that there is no notion of a
+"current directory" in this library so you'll be stuck with the initial working directory.
+
 By default, you can move outside the mount point with ".." segments. If you want to disable this
 functionality, you can use the `FS_NO_ABOVE_ROOT_NAVIGATION` flag: