kernel/vfs: allow reading the root directory

1 files changed, 21 insertions, 5 deletions

diff --git a/src/kernel/vfs/root.c b/src/kernel/vfs/root.c
index 8e2c8a2..834bed7 100644
--- a/src/kernel/vfs/root.c
+++ b/src/kernel/vfs/root.c
@@ -4,21 +4,35 @@
 #include <kernel/util.h>
 #include <kernel/vfs/root.h>
 
+enum {
+	HANDLE_ROOT,
+	HANDLE_TTY,
+};
+
 int vfs_root_handler(struct vfs_request *req) {
 	switch (req->type) {
 		case VFSOP_OPEN:
 			assert(req->input.kern);
+			if (req->input.len == 1 && *req->input.buf_kern == '/')
+				return HANDLE_ROOT;
 			if (req->input.len == 4
 					&& !memcmp(req->input.buf_kern, "/tty", 4)) {
-				return 0;
+				return HANDLE_TTY;
 			}
 			return -1;
 
 		case VFSOP_READ:
 			switch (req->id) {
-				// every id corresponds to a special file type
-				// this is a shit way to do this but :shrug:
-				case 0: { // tty
+				case HANDLE_ROOT: {
+					const char *src = "tty"; // TODO document directory read format
+					int srclen = 4; // TODO port strlen to the kernel
+					int len = req->output.len;
+					if (len < 0) return 0; // is this needed?
+					if (len > srclen) len = srclen;
+					virt_cpy_to(req->caller->pages, req->output.buf, src, len);
+					return len;
+				}
+				case HANDLE_TTY: {
 					struct virt_iter iter;
 					virt_iter_new(&iter, req->output.buf, req->output.len,
 							req->caller->pages, true, false);
@@ -31,7 +45,8 @@ int vfs_root_handler(struct vfs_request *req) {
 
 		case VFSOP_WRITE:
 			switch (req->id) {
-				case 0: { // tty
+				case HANDLE_ROOT: return -1;
+				case HANDLE_TTY: {
 					struct virt_iter iter;
 					virt_iter_new(&iter, req->input.buf, req->input.len,
 							req->caller->pages, true, false);
@@ -41,6 +56,7 @@ int vfs_root_handler(struct vfs_request *req) {
 				}
 				default: panic_invalid_state();
 			}
+
 		default: panic_invalid_state();
 	}
 }