From 406dc0ee9e3d5332850e8a9352ee417b7564e847 Mon Sep 17 00:00:00 2001
From: antifallobst <antifallobst@systemausfall.org>
Date: Tue, 2 May 2023 18:01:53 +0200
Subject: [PATCH] feature (VFS): returning amount of written/read bytes

---
 inc/drivers/fs/ramfs.h |  6 +++---
 inc/drivers/fs/vfs.h   |  4 ++--
 src/drivers/fs/ramfs.c |  9 ++++++---
 src/drivers/fs/vfs.c   | 14 ++++++++------
 4 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/inc/drivers/fs/ramfs.h b/inc/drivers/fs/ramfs.h
index 5ba16be..ece93b5 100644
--- a/inc/drivers/fs/ramfs.h
+++ b/inc/drivers/fs/ramfs.h
@@ -5,9 +5,9 @@
 
 #include "drivers/fs/vfs.h"
 
-void ramfs_file_delete  (vfs_node_T* node);
-void ramfs_file_write   (vfs_node_T* node, uint64_t size, uint8_t* buffer_in);
-void ramfs_file_read    (vfs_node_T* node, uint64_t size, uint8_t* buffer_out);
+void     ramfs_file_delete  (vfs_node_T* node);
+uint64_t ramfs_file_write   (vfs_node_T* node, uint64_t size, uint8_t* buffer_in);
+uint64_t ramfs_file_read    (vfs_node_T* node, uint64_t size, uint8_t* buffer_out);
 
 
 #endif //NOX_RAMFS_H
diff --git a/inc/drivers/fs/vfs.h b/inc/drivers/fs/vfs.h
index 01bb3cd..631487d 100644
--- a/inc/drivers/fs/vfs.h
+++ b/inc/drivers/fs/vfs.h
@@ -65,8 +65,8 @@ vfs_node_T*         vfs_node_resolve_child      (vfs_node_T* node, string_t chil
 
 vfs_node_T*         vfs_file_create             (fs_T* filesystem, string_t path);
 void                vfs_file_delete             (vfs_node_T* file);
-void                vfs_file_write              (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in);
-void                vfs_file_read               (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_out);
+uint64_t            vfs_file_write              (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in);
+uint64_t            vfs_file_read               (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_out);
 
 vfs_node_T*         vfs_directory_create        (fs_T* filesystem, string_t path);
 void                vfs_directory_delete        (vfs_node_T* directory);
diff --git a/src/drivers/fs/ramfs.c b/src/drivers/fs/ramfs.c
index 7d89aa4..bf5ae62 100644
--- a/src/drivers/fs/ramfs.c
+++ b/src/drivers/fs/ramfs.c
@@ -10,7 +10,7 @@ void ramfs_file_delete(vfs_node_T* node) {
     vfs_node_cache_destruct(node->cache);
 }
 
-void ramfs_file_write(vfs_node_T* node, uint64_t size, uint8_t* buffer_in) {
+uint64_t ramfs_file_write(vfs_node_T* node, uint64_t size, uint8_t* buffer_in) {
     if (node->cache != NULL) {
         vfs_node_cache_destruct(node->cache);
     }
@@ -18,10 +18,13 @@ void ramfs_file_write(vfs_node_T* node, uint64_t size, uint8_t* buffer_in) {
     vfs_node_cache_create(node, size);
 
     memory_copy(buffer_in, node->cache->buffer, size);
+
+    return size;
 }
 
-void ramfs_file_read(vfs_node_T* node, uint64_t size, uint8_t* buffer_out) {
-    if (node->cache == NULL) { return; }
+uint64_t ramfs_file_read(vfs_node_T* node, uint64_t size, uint8_t* buffer_out) {
+    if (node->cache == NULL) { return 0; }
 
     memory_copy(node->cache->buffer, buffer_out, MIN(size, node->cache->buffer_size));
+    return size;
 }
\ No newline at end of file
diff --git a/src/drivers/fs/vfs.c b/src/drivers/fs/vfs.c
index 53773c8..ce833c7 100644
--- a/src/drivers/fs/vfs.c
+++ b/src/drivers/fs/vfs.c
@@ -224,31 +224,33 @@ void vfs_file_delete(vfs_node_T* file) {
     vfs_node_destruct(file);
 }
 
-void vfs_file_write(vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in) {
+uint64_t vfs_file_write(vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in) {
     // in future this probably isn't a good way to determine the size of a file:
     file->size = size;
 
     switch (file->filesystem->type) {
         case FS_RAMFS: {
-            ramfs_file_write(file, size, buffer_in);
-            break;
+            return ramfs_file_write(file, size, buffer_in);
         }
         default: {
             break;
         }
     }
+
+    return 0;
 }
 
-void vfs_file_read(vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_out) {
+uint64_t vfs_file_read(vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_out) {
     switch (file->filesystem->type) {
         case FS_RAMFS: {
-            ramfs_file_read(file, size, buffer_out);
-            break;
+            return ramfs_file_read(file, size, buffer_out);
         }
         default: {
             break;
         }
     }
+
+    return 0;
 }
 
 vfs_node_T* vfs_directory_create(fs_T* filesystem, string_t path) {