From e22e493940266e0aa9be2bf58df1821a3539e19b Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Wed, 15 Nov 2023 02:44:45 +0100
Subject: Kernel/LibC: Add chdir function and syscall

---
 kernel/fs/vfs.c | 21 +++++++++++++++++++++
 kernel/fs/vfs.h |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)

(limited to 'kernel/fs')

diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c
index 0911c95..8c9e08d 100644
--- a/kernel/fs/vfs.c
+++ b/kernel/fs/vfs.c
@@ -168,6 +168,27 @@ int vfs_fstat(int fd, struct stat *buf) {
   return fd_ptr->inode->stat(fd_ptr, buf);
 }
 
+int vfs_chdir(const char *path) {
+  char tmp_path[256];
+  char *resolved_path = vfs_resolve_path(path, tmp_path);
+  {
+    int tmp_fd = vfs_open(resolved_path, O_READ, 0);
+    if (0 > tmp_fd)
+      return tmp_fd;
+    struct stat stat_result;
+    vfs_fstat(tmp_fd, &stat_result);
+    if (STAT_DIR != stat_result.st_mode) {
+      kprintf("vfs_chdir: -ENOTDIR\n");
+      return -ENOTDIR;
+    }
+    vfs_close(tmp_fd);
+  }
+  strcpy(get_current_task()->current_working_directory, resolved_path);
+  if ('/' != resolved_path[strlen(resolved_path)])
+    strcat(get_current_task()->current_working_directory, "/");
+  return 0;
+}
+
 int vfs_mkdir(const char *path, int mode) {
   vfs_mounts_t *file_mount = 0;
   int length = 0;
diff --git a/kernel/fs/vfs.h b/kernel/fs/vfs.h
index 3e3e1ff..b6a3401 100644
--- a/kernel/fs/vfs.h
+++ b/kernel/fs/vfs.h
@@ -79,7 +79,7 @@ void vfs_mount(char *path, vfs_inode_t *local_root);
 int vfs_pwrite(int fd, void *buf, u64 count, u64 offset);
 int raw_vfs_pwrite(vfs_fd_t *vfs_fd, void *buf, u64 count, u64 offset);
 int raw_vfs_pread(vfs_fd_t *vfs_fd, void *buf, u64 count, u64 offset);
-int vfs_pread(int fd, void *buf, u32 count, u32 offset);
+int vfs_pread(int fd, void *buf, u64 count, u64 offset);
 vfs_vm_object_t *vfs_get_vm_object(int fd, u64 length, u64 offset);
 int vfs_dup2(int org_fd, int new_fd);
 vfs_inode_t *vfs_internal_open(const char *file);
-- 
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