From a0721b4caa79b81e021678089fde0b8467daa1cd Mon Sep 17 00:00:00 2001
From: Franklin Wei <frankhwei536@gmail.com>
Date: Mon, 2 Mar 2015 21:37:44 -0500
Subject: Virtual filesystem WIP!

---
 kernel/vfs.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 kernel/vfs.c

(limited to 'kernel/vfs.c')

diff --git a/kernel/vfs.c b/kernel/vfs.c
new file mode 100644
index 0000000..cc6152f
--- /dev/null
+++ b/kernel/vfs.c
@@ -0,0 +1,91 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "heap.h"
+#include "vfs.h"
+
+`static struct vfs_node *new_node(void)
+{
+    struct vfs_node *ret = kmalloc(sizeof(struct vfs_node));
+    memset(ret, 0, sizeof(struct vfs_node));
+    return ret;
+}
+
+struct vfs_node *vfs_init(void)
+{
+    struct vfs_node *root = new_node();
+    root->flags = VFS_DIR;
+    root->name = malloc(1);
+    root->name[0] = '\0';
+
+    return root;
+}
+
+int vfs_mkdir(struct vfs_node *node, const char *name)
+{
+    if(!node)
+        return 0;
+    if((node->flags & VFS_TYPEMASK) != VFS_DIR)
+        return 0;
+    /* insert a new element at the beginning of the linked list of the directory's children */
+    struct vfs_node *newdir = new_node();
+    newdir->flags = VFS_DIR;
+    newdir->name = strdup(name);
+    newdir->parent = node;
+    newdir->next = node->child;
+
+    node->child = newdir;
+    return 1;
+}
+
+int vfs_creat(struct vfs_node *node, const char *name)
+{
+    if(!node)
+        return 0;
+    if((node->flags & VFS_TYPEMASK) != VFS_DIR)
+        return 0;
+    struct vfs_node *newfile = new_node();
+    newfile->flags = VFS_REG;
+    newfile->name = strdup(name);
+    newfile->parent = node;
+    newfile->next = node->child;
+
+    node->child = newfile;
+    return 1;
+}
+
+DIR *vfs_opendir(struct vfs_node *node)
+{
+    DIR *dirp = malloc(sizeof(DIR));
+    dirp->node = node->child;
+    return dirp;
+}
+
+struct dirent *vfs_readdir(DIR *dirp)
+{
+    if(!dirp->node)
+        return NULL;
+    static struct dirent ret;
+    memcpy(ret.d_name, dirp->node->name, MIN(strlen(dirp->node->name)+1, sizeof(ret.d_name)));
+    switch(dirp->node->flags & VFS_TYPEMASK)
+    {
+    case VFS_DIR:
+        ret.d_type = DT_DIR;
+        break;
+    case VFS_REG:
+        ret.d_type = DT_REG;
+        break;
+        /* fall through */
+    case VFS_SPEC:
+    default:
+        ret.d_type = DT_UNKNOWN;
+    }
+    dirp->node = dirp->node->next;
+    return &ret;
+}
+
+char *vfs_path(struct vfs_node *node)
+{
+    struct vfs_node *
+}
-- 
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