Update kernel

KernelShell/Commands/cat.cpp

@@ -0,0 +1,55 @@
+/*
+   This file is part of Fennix Kernel.
+
+   Fennix Kernel is free software: you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of
+   the License, or (at your option) any later version.
+
+   Fennix Kernel is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "../cmds.hpp"
+
+#include <filesystem.hpp>
+
+#include "../../kernel.h"
+
+using namespace VirtualFileSystem;
+
+void cmd_cat(const char *args)
+{
+	if (args[0] == '\0')
+		return;
+
+	Node *thisNode = vfs->GetNodeFromPath(args, thisProcess->CurrentWorkingDirectory);
+	if (thisNode == nullptr)
+	{
+		printf("cat: %s: No such file or directory\n", args);
+		return;
+	}
+
+	if (thisNode->Flags != NodeFlags::FILE &&
+		thisNode->Flags != NodeFlags::CHARDEVICE)
+	{
+		printf("cat: %s: Not a file\n", args);
+		return;
+	}
+	std::string path = vfs->GetPathFromNode(thisNode);
+
+	int fd = fopen(path.c_str(), "r");
+	struct stat st;
+	fstat(fd, &st);
+
+	char *buffer = new char[st.st_size + 1];
+	fread(fd, buffer, st.st_size);
+	printf("%s\n", buffer);
+	delete[] buffer;
+	fclose(fd);
+}