1 files changed, 109 insertions, 0 deletions
diff --git a/gdb/pager.h b/gdb/pager.h
new file mode 100644
index 00000000000..0151a283629
--- /dev/null
+++ b/gdb/pager.h
@@ -0,0 +1,109 @@
+/* Output pager for gdb
+   Copyright (C) 2021, 2022 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef GDB_PAGER_H
+#define GDB_PAGER_H
+
+#include "ui-file.h"
+
+/* A ui_file that implements output paging and unfiltered output.  */
+
+class pager_file : public ui_file
+{
+public:
+  /* Create a new pager_file.  The new object takes ownership of
+     STREAM.  */
+  explicit pager_file (ui_file *stream)
+    : m_stream (stream)
+  {
+  }
+
+  DISABLE_COPY_AND_ASSIGN (pager_file);
+
+  void write (const char *buf, long length_buf) override;
+
+  void puts (const char *str) override;
+
+  void write_async_safe (const char *buf, long length_buf) override
+  {
+    m_stream->write_async_safe (buf, length_buf);
+  }
+
+  bool term_out () override
+  {
+    return m_stream->term_out ();
+  }
+
+  bool isatty () override
+  {
+    return m_stream->isatty ();
+  }
+
+  bool can_emit_style_escape () override
+  {
+    return m_stream->can_emit_style_escape ();
+  }
+
+  void emit_style_escape (const ui_file_style &style) override;
+  void reset_style () override;
+
+  void flush () override;
+
+  int fd () const override
+  {
+    return m_stream->fd ();
+  }
+
+  void wrap_here (int indent) override;
+
+  void puts_unfiltered (const char *str) override
+  {
+    flush_wrap_buffer ();
+    m_stream->puts_unfiltered (str);
+  }
+
+private:
+
+  void prompt_for_continue ();
+
+  /* Flush the wrap buffer to STREAM, if necessary.  */
+  void flush_wrap_buffer ();
+
+  /* Contains characters which are waiting to be output (they have
+     already been counted in chars_printed).  */
+  std::string m_wrap_buffer;
+
+  /* Amount to indent by if the wrap occurs.  */
+  int m_wrap_indent = 0;
+
+  /* Column number on the screen where wrap_buffer begins, or 0 if
+     wrapping is not in effect.  */
+  int m_wrap_column = 0;
+
+  /* The style applied at the time that wrap_here was called.  */
+  ui_file_style m_wrap_style;
+
+  /* The unfiltered output stream.  */
+  ui_file_up m_stream;
+
+  /* This is temporarily set when paging.  This will cause some
+     methods to change their behavior to ignore the wrap buffer.  */
+  bool m_paging = false;
+};
+
+#endif /* GDB_PAGER_H */