From 0c236f1a362450ba91e9872cb27e9e23c2452211 Mon Sep 17 00:00:00 2001
From: Baptiste Wicht <baptiste.wicht@gmail.com>
Date: Sat, 1 Mar 2014 22:01:25 +0100
Subject: [PATCH] Add a way for the system to set values

---
 kernel/src/fs/sysfs.cpp | 68 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 64 insertions(+), 4 deletions(-)

diff --git a/kernel/src/fs/sysfs.cpp b/kernel/src/fs/sysfs.cpp
index 16f4ab25..65fc1b42 100644
--- a/kernel/src/fs/sysfs.cpp
+++ b/kernel/src/fs/sysfs.cpp
@@ -20,16 +20,61 @@ namespace {
 struct sys_value {
     std::string name;
     std::string value;
+
+    sys_value(){}
+    sys_value(std::string name, std::string value) : name(name), value(value){
+        //Nothing else to init
+    }
 };
 
 struct sys_folder {
     std::string name;
     std::vector<sys_folder> folders;
     std::vector<sys_value> values;
+
+    sys_folder(){}
+
+    sys_folder(std::string name) : name(name) {
+        //Nothing else to init
+    }
 };
 
 std::vector<sys_folder> root_folders;
 
+sys_folder& find_root_folder(const std::string& mount_point){
+    for(auto& sys_folder : root_folders){
+        if(sys_folder.name == mount_point){
+            return sys_folder;
+        }
+    }
+
+    root_folders.emplace_back(mount_point);
+
+    return root_folders.back();
+}
+
+sys_folder& find_folder(sys_folder& root, const std::vector<std::string>& path, size_t i = 0){
+    auto& name = path[i];
+
+    for(auto& folder : root.folders){
+        if(folder.name == name){
+            if(i == path.size() - 1){
+                return folder;
+            } else {
+                return find_folder(folder, path, i + 1);
+            }
+        }
+    }
+
+    root.folders.emplace_back(name);
+
+    if(i == path.size() - 1){
+        return root.folders.back();
+    } else {
+        return find_folder(root.folders.back(), path, i + 1);
+    }
+}
+
 } //end of anonymous namespace
 
 sysfs::sysfs_file_system::sysfs_file_system(std::string mp) : mount_point(mp) {
@@ -55,15 +100,15 @@ size_t sysfs::sysfs_file_system::ls(const std::vector<std::string>& file_path, s
     return 0;
 }
 
-size_t sysfs::sysfs_file_system::touch(const std::vector<std::string>& file_path){
+size_t sysfs::sysfs_file_system::touch(const std::vector<std::string>& ){
     return std::ERROR_PERMISSION_DENIED;
 }
 
-size_t sysfs::sysfs_file_system::mkdir(const std::vector<std::string>& file_path){
+size_t sysfs::sysfs_file_system::mkdir(const std::vector<std::string>& ){
     return std::ERROR_PERMISSION_DENIED;
 }
 
-size_t sysfs::sysfs_file_system::rm(const std::vector<std::string>& file_path){
+size_t sysfs::sysfs_file_system::rm(const std::vector<std::string>& ){
     return std::ERROR_PERMISSION_DENIED;
 }
 
@@ -75,7 +120,22 @@ size_t sysfs::sysfs_file_system::statfs(statfs_info& file){
 }
 
 void set_value(const std::string& mount_point, const std::string& path, const std::string& value){
-    //TODO
+    auto& root_folder = find_root_folder(mount_point);
+
+    auto file_path = std::split(path, '/');
+    auto last = file_path.back();
+    file_path.pop_back();
+
+    auto& folder = find_folder(root_folder, file_path);
+
+    for(auto& v : folder.values){
+        if(v.name == last){
+            v.value = value;
+            return;
+        }
+    }
+
+    folder.values.emplace_back(last, value);
 }
 
 void delete_value(const std::string& mount_point, const std::string& path){