From 02194a2557b50bf850ff2a26d6e1eb6e7b67bb7c Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sat, 23 Nov 2024 15:00:16 +0100
Subject: vfs: Add O_APPEND support + refactoring
---
kernel/fs/vfs.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
(limited to 'kernel/fs/vfs.c')
diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c
index 1f28f13..25e2423 100644
--- a/kernel/fs/vfs.c
+++ b/kernel/fs/vfs.c
@@ -382,6 +382,50 @@ int vfs_pwrite(int fd, void *buf, u64 count, u64 offset) {
return rc;
}
+// FIXME: These should be in a shared header file with libc
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+int vfs_lseek(int fd, int offset, int whence) {
+ vfs_fd_t *fd_ptr = get_vfs_fd(fd, NULL);
+ if (!fd_ptr) {
+ return -EBADF;
+ }
+
+ off_t ret_offset = fd_ptr->offset;
+ switch (whence) {
+ case SEEK_SET:
+ ret_offset = offset;
+ break;
+ case SEEK_CUR:
+ ret_offset += offset;
+ break;
+ case SEEK_END:
+ assert(fd_ptr->inode);
+ ret_offset = fd_ptr->inode->file_size + offset;
+ break;
+ default:
+ return -EINVAL;
+ break;
+ }
+ fd_ptr->offset = ret_offset;
+ return ret_offset;
+}
+
+int vfs_write(int fd, const char *buf, u64 count) {
+ vfs_fd_t *fd_ptr = get_vfs_fd(fd, NULL);
+ if (!fd_ptr) {
+ return -EBADF;
+ }
+ if (fd_ptr->mode & O_APPEND) {
+ vfs_lseek(fd, 0, SEEK_END);
+ }
+ int rc = vfs_pwrite(fd, (char *)buf, count, fd_ptr->offset);
+ fd_ptr->offset += rc;
+ return rc;
+}
+
vfs_vm_object_t *vfs_get_vm_object(int fd, u64 length, u64 offset) {
vfs_fd_t *vfs_fd = get_vfs_fd(fd, NULL);
if (!vfs_fd) {
--
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