ADD file via upload

getcwd.c

@@ -0,0 +1,38 @@
+long sys_getcwd(char* buf, size_t size)
+{
+	struct buffer_head* bh;
+	struct m_inode* n_inode, * f_inode;
+	struct dir_entry* dir;
+	char* tmp, * b;
+	int k, i;
+	tmp = (char*)malloc(256);
+	b = (char*)malloc(256);
+	n_inode = current->pwd;
+	if (n_inode == current->root)strcpy(tmp, "/");
+	bh = bread(n_inode->i_dev, n_inode->i_zone[0]);
+	while (n_inode != current->root)
+	{
+		dir = (struct dir_entry*)(bh->b_data + sizeof(struct dir_entry));
+		f_inode = iget(n_inode->i_dev, dir->inode);
+		brelse(bh);
+		bh = bread(f_inode->i_dev, f_inode->i_zone[0]);
+		k = 0;
+		while (k < f_inode->i_size)
+		{
+			dir = (struct dir_entry*)(bh->b_data + k);
+			if (dir->inode == n_inode->i_num)break;
+			k += sizeof(struct dir_entry);
+		}
+		strcpy(b, "/");
+		strcat(b, dir->name);
+		strcat(b, tmp);
+		strcpy(tmp, b);
+		n_inode = f_inode;
+	}
+	brelse(bh);
+	if (strlen(tmp) > size)return NULL;
+	for (i = 0; i < 256; i++)
+		put_fs_byte(tmp[i], buf + i);
+	return (long)buf;
+}
+