1 files changed, 136 insertions, 0 deletions
diff --git a/src/dos/program_more_output.h b/src/dos/program_more_output.h
new file mode 100644
index 000000000..e147eff2e
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+++ b/src/dos/program_more_output.h
@@ -0,0 +1,136 @@
+/*
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ *  Copyright (C) 2022-2022  The DOSBox Staging Team
+ *
+ *  This program 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef DOSBOX_PROGRAM_MORE_OUTPUT_H
+#define DOSBOX_PROGRAM_MORE_OUTPUT_H
+
+#include "programs.h"
+
+#include <string>
+
+// ***************************************************************************
+// Base class, only for internal usage
+// ***************************************************************************
+
+class MoreOutputBase {
+public:
+	MoreOutputBase(Program &program);
+	virtual ~MoreOutputBase() = default;
+
+	void SetTabSize(const uint8_t new_tab_size);
+
+	virtual void Display() = 0;
+
+protected:
+
+	uint16_t GetMaxLines() const;
+	uint16_t GetMaxColumns() const;
+
+	void PrepareInternals();
+	UserDecision DisplaySingleStream();
+	UserDecision PromptUser();
+
+	virtual bool GetCharacterRaw(char &code, bool &is_definitely_last) = 0;
+
+	uint16_t line_counter = 0; // how many lines printed out since last user prompt
+
+	bool was_prompt_recently  = false; // if next user prompt can be skipped
+	bool has_multiple_files   = false; // if more than 1 file has to be displayed
+	bool should_end_on_ctrl_c = false; // reaction on CTRL+C in the input
+	bool should_print_ctrl_c  = false; // if Ctrl+C on input should print '^C'
+
+	// Wrappers for Program:: methods
+
+	template <typename... Arguments>
+	void WriteOut(const char *format, Arguments... arguments)
+	{
+		program.WriteOut(format, arguments...);
+	}
+
+	bool SuppressWriteOut(const char *format)
+	{
+		return program.SuppressWriteOut(format);
+	}
+
+private:
+	Program &program;
+
+	static uint8_t GetCurrentColumn();
+	static uint8_t GetCurrentRow();
+	bool GetCharacter(char &code, bool &is_definitely_last);
+
+	uint16_t max_lines   = 0; // max number of lines to display between user prompts
+	uint16_t max_columns = 0;
+
+	uint8_t tab_size            = 8; // how many spaces to print for a TAB
+	uint8_t tabs_remaining      = 0; // how many still to be printed for a current TAB
+	bool is_tab_definitely_last = false;
+
+	bool skip_next_cr = false;
+	bool skip_next_lf = false;
+};
+
+// ***************************************************************************
+// Output file/device/stream content via MORE
+// ***************************************************************************
+
+class MoreOutputFiles final : public MoreOutputBase {
+public:
+	MoreOutputFiles(Program &program);
+
+	void AddFile(const std::string &file_path, const bool is_device);
+	void Display() override;
+
+private:
+	void DisplayInputFiles();
+	void DisplayInputStream();
+
+	std::string GetShortPath(const std::string &file_path, const char *msg_id);
+
+	bool GetCharacterRaw(char &code, bool &is_definitely_last) override;
+
+	struct InputFile {
+		std::string path = "";
+		bool is_device   = false; // whether this is a regular file or a device
+	};
+
+	std::vector<InputFile> input_files = {};
+	uint16_t input_handle = 0; // DOS handle of the input stream
+};
+
+// ***************************************************************************
+// Output string content via MORE
+// ***************************************************************************
+
+class MoreOutputStrings final : public MoreOutputBase {
+public:
+	MoreOutputStrings(Program &program);
+
+	void AddString(const char *format, ...);
+	void Display() override;
+
+private:
+	bool GetCharacterRaw(char &code, bool &is_definitely_last) override;
+
+	std::string input_strings = {};
+	size_t input_position     = 0;
+};
+
+#endif