gdb/ui-file.c - binutils-gdb - Git at Google

 /* UI_FILE - a generic STDIO like output stream.

    Copyright (C) 1999-2022 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/>.  */

 /* Implement the ``struct ui_file'' object.  */

 #include "defs.h"
 #include "ui-file.h"
 #include "gdbsupport/gdb_obstack.h"
 #include "gdbsupport/gdb_select.h"
 #include "gdbsupport/filestuff.h"
 #include "cli-out.h"
 #include "cli/cli-style.h"
 #include <chrono>

 null_file null_stream;

 ui_file::ui_file ()
 {}

 ui_file::~ui_file ()
 {}

 void
 ui_file::printf (const char *format, ...)
 {
   va_list args;

   va_start (args, format);
   vprintf (format, args);
   va_end (args);
 }

 void
 ui_file::putstr (const char *str, int quoter)
 {
   while (*str)
     printchar (*str++, quoter, false);
 }

 void
 ui_file::putstrn (const char *str, int n, int quoter, bool async_safe)
 {
   for (int i = 0; i < n; i++)
     printchar (str[i], quoter, async_safe);
 }

 void
 ui_file::putc (int c)
 {
   char copy = (char) c;
   write (&copy, 1);
 }

 void
 ui_file::vprintf (const char *format, va_list args)
 {
   ui_out_flags flags = disallow_ui_out_field;
   cli_ui_out (this, flags).vmessage (m_applied_style, format, args);
 }

 /* See ui-file.h.  */

 void
 ui_file::emit_style_escape (const ui_file_style &style)
 {
   if (can_emit_style_escape () && style != m_applied_style)
     {
       m_applied_style = style;
       this->puts (style.to_ansi ().c_str ());
     }
 }

 /* See ui-file.h.  */

 void
 ui_file::reset_style ()
 {
   if (can_emit_style_escape ())
     {
       m_applied_style = ui_file_style ();
       this->puts (m_applied_style.to_ansi ().c_str ());
     }
 }

 /* See ui-file.h.  */

 void
 ui_file::printchar (int c, int quoter, bool async_safe)
 {
   char buf[4];
   int out = 0;

   c &= 0xFF;			/* Avoid sign bit follies */

   if (c < 0x20			 /* Low control chars */
       || (c >= 0x7F && c < 0xA0) /* DEL, High controls */
       || (sevenbit_strings && c >= 0x80))
     {				/* high order bit set */
       buf[out++] = '\\';

       switch (c)
 	{
 	case '\n':
 	  buf[out++] = 'n';
 	  break;
 	case '\b':
 	  buf[out++] = 'b';
 	  break;
 	case '\t':
 	  buf[out++] = 't';
 	  break;
 	case '\f':
 	  buf[out++] = 'f';
 	  break;
 	case '\r':
 	  buf[out++] = 'r';
 	  break;
 	case '\033':
 	  buf[out++] = 'e';
 	  break;
 	case '\007':
 	  buf[out++] = 'a';
 	  break;
 	default:
 	  {
 	    buf[out++] = '0' + ((c >> 6) & 0x7);
 	    buf[out++] = '0' + ((c >> 3) & 0x7);
 	    buf[out++] = '0' + ((c >> 0) & 0x7);
 	    break;
 	  }
 	}
     }
   else
     {
       if (quoter != 0 && (c == '\\' || c == quoter))
 	buf[out++] = '\\';
       buf[out++] = c;
     }

   if (async_safe)
     this->write_async_safe (buf, out);
   else
     this->write (buf, out);
 }


 void
 null_file::write (const char *buf, long sizeof_buf)
 {
   /* Discard the request.  */
 }

 void
 null_file::puts (const char *)
 {
   /* Discard the request.  */
 }

 void
 null_file::write_async_safe (const char *buf, long sizeof_buf)
 {
   /* Discard the request.  */
 }


 /* true if the gdb terminal supports styling, and styling is enabled.  */

 static bool
 term_cli_styling ()
 {
   if (!cli_styling)
     return false;

   const char *term = getenv ("TERM");
   /* Windows doesn't by default define $TERM, but can support styles
      regardless.  */
 #ifndef _WIN32
   if (term == nullptr || !strcmp (term, "dumb"))
     return false;
 #else
   /* But if they do define $TERM, let us behave the same as on Posix
      platforms, for the benefit of programs which invoke GDB as their
      back-end.  */
   if (term && !strcmp (term, "dumb"))
     return false;
 #endif
   return true;
 }


 string_file::~string_file ()
 {}

 void
 string_file::write (const char *buf, long length_buf)
 {
   m_string.append (buf, length_buf);
 }

 /* See ui-file.h.  */

 bool
 string_file::term_out ()
 {
   return m_term_out;
 }

 /* See ui-file.h.  */

 bool
 string_file::can_emit_style_escape ()
 {
   return m_term_out && term_cli_styling ();
 }


 stdio_file::stdio_file (FILE *file, bool close_p)
 {
   set_stream (file);
   m_close_p = close_p;
 }

 stdio_file::stdio_file ()
   : m_file (NULL),
     m_fd (-1),
     m_close_p (false)
 {}

 stdio_file::~stdio_file ()
 {
   if (m_close_p)
     fclose (m_file);
 }

 void
 stdio_file::set_stream (FILE *file)
 {
   m_file = file;
   m_fd = fileno (file);
 }

 bool
 stdio_file::open (const char *name, const char *mode)
 {
   /* Close the previous stream, if we own it.  */
   if (m_close_p)
     {
       fclose (m_file);
       m_close_p = false;
     }

   gdb_file_up f = gdb_fopen_cloexec (name, mode);

   if (f == NULL)
     return false;

   set_stream (f.release ());
   m_close_p = true;

   return true;
 }

 void
 stdio_file::flush ()
 {
   fflush (m_file);
 }

 long
 stdio_file::read (char *buf, long length_buf)
 {
   /* Wait until at least one byte of data is available, or we get
      interrupted with Control-C.  */
   {
     fd_set readfds;

     FD_ZERO (&readfds);
     FD_SET (m_fd, &readfds);
     if (interruptible_select (m_fd + 1, &readfds, NULL, NULL, NULL) == -1)
       return -1;
   }

   return ::read (m_fd, buf, length_buf);
 }

 void
 stdio_file::write (const char *buf, long length_buf)
 {
   /* Calling error crashes when we are called from the exception framework.  */
   if (fwrite (buf, length_buf, 1, m_file))
     {
       /* Nothing.  */
     }
 }

 void
 stdio_file::write_async_safe (const char *buf, long length_buf)
 {
   /* This is written the way it is to avoid a warning from gcc about not using the
      result of write (since it can be declared with attribute warn_unused_result).
      Alas casting to void doesn't work for this.  */
   if (::write (m_fd, buf, length_buf))
     {
       /* Nothing.  */
     }
 }

 void
 stdio_file::puts (const char *linebuffer)
 {
   /* This host-dependent function (with implementations in
      posix-hdep.c and mingw-hdep.c) is given the opportunity to
      process the output first in host-dependent way.  If it does, it
      should return non-zero, to avoid calling fputs below.  */
   if (gdb_console_fputs (linebuffer, m_file))
     return;
   /* Calling error crashes when we are called from the exception framework.  */
   if (fputs (linebuffer, m_file))
     {
       /* Nothing.  */
     }
 }

 bool
 stdio_file::isatty ()
 {
   return ::isatty (m_fd);
 }

 /* See ui-file.h.  */

 bool
 stdio_file::can_emit_style_escape ()
 {
   return (this->isatty ()
 	  && term_cli_styling ());
 }


 /* This is the implementation of ui_file method 'write' for stderr.
    gdb_stdout is flushed before writing to gdb_stderr.  */

 void
 stderr_file::write (const char *buf, long length_buf)
 {
   gdb_stdout->flush ();
   stdio_file::write (buf, length_buf);
 }

 /* This is the implementation of ui_file method 'puts' for stderr.
    gdb_stdout is flushed before writing to gdb_stderr.  */

 void
 stderr_file::puts (const char *linebuffer)
 {
   gdb_stdout->flush ();
   stdio_file::puts (linebuffer);
 }

 stderr_file::stderr_file (FILE *stream)
   : stdio_file (stream)
 {}


 tee_file::tee_file (ui_file *one, ui_file_up &&two)
   : m_one (one),
     m_two (std::move (two))
 {}

 tee_file::~tee_file ()
 {
 }

 void
 tee_file::flush ()
 {
   m_one->flush ();
   m_two->flush ();
 }

 void
 tee_file::write (const char *buf, long length_buf)
 {
   m_one->write (buf, length_buf);
   m_two->write (buf, length_buf);
 }

 void
 tee_file::write_async_safe (const char *buf, long length_buf)
 {
   m_one->write_async_safe (buf, length_buf);
   m_two->write_async_safe (buf, length_buf);
 }

 void
 tee_file::puts (const char *linebuffer)
 {
   m_one->puts (linebuffer);
   m_two->puts (linebuffer);
 }

 bool
 tee_file::isatty ()
 {
   return m_one->isatty ();
 }

 /* See ui-file.h.  */

 bool
 tee_file::term_out ()
 {
   return m_one->term_out ();
 }

 /* See ui-file.h.  */

 bool
 tee_file::can_emit_style_escape ()
 {
   return (m_one->term_out ()
 	  && term_cli_styling ());
 }

 /* See ui-file.h.  */

 void
 no_terminal_escape_file::write (const char *buf, long length_buf)
 {
   std::string copy (buf, length_buf);
   this->puts (copy.c_str ());
 }

 /* See ui-file.h.  */

 void
 no_terminal_escape_file::puts (const char *buf)
 {
   while (*buf != '\0')
     {
       const char *esc = strchr (buf, '\033');
       if (esc == nullptr)
 	break;

       int n_read = 0;
       if (!skip_ansi_escape (esc, &n_read))
 	++esc;

       this->stdio_file::write (buf, esc - buf);
       buf = esc + n_read;
     }

   if (*buf != '\0')
     this->stdio_file::write (buf, strlen (buf));
 }

 void
 timestamped_file::write (const char *buf, long len)
 {
   if (debug_timestamp)
     {
       /* Print timestamp if previous print ended with a \n.  */
       if (m_needs_timestamp)
 	{
 	  using namespace std::chrono;

 	  steady_clock::time_point now = steady_clock::now ();
 	  seconds s = duration_cast<seconds> (now.time_since_epoch ());
 	  microseconds us = duration_cast<microseconds> (now.time_since_epoch () - s);
 	  std::string timestamp = string_printf ("%ld.%06ld ",
 						 (long) s.count (),
 						 (long) us.count ());
 	  m_stream->puts (timestamp.c_str ());
 	}

       /* Print the message.  */
       m_stream->write (buf, len);

       m_needs_timestamp = (len > 0 && buf[len - 1] == '\n');
     }
   else
     m_stream->write (buf, len);
 }
	/* UI_FILE - a generic STDIO like output stream.

	Copyright (C) 1999-2022 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/>. */

	/* Implement the ``struct ui_file'' object. */

	#include "defs.h"
	#include "ui-file.h"
	#include "gdbsupport/gdb_obstack.h"
	#include "gdbsupport/gdb_select.h"
	#include "gdbsupport/filestuff.h"
	#include "cli-out.h"
	#include "cli/cli-style.h"
	#include <chrono>

	null_file null_stream;

	ui_file::ui_file ()
	{}

	ui_file::~ui_file ()
	{}

	void
	ui_file::printf (const char *format, ...)
	{
	va_list args;

	va_start (args, format);
	vprintf (format, args);
	va_end (args);
	}

	void
	ui_file::putstr (const char *str, int quoter)
	{
	while (*str)
	printchar (*str++, quoter, false);
	}

	void
	ui_file::putstrn (const char *str, int n, int quoter, bool async_safe)
	{
	for (int i = 0; i < n; i++)
	printchar (str[i], quoter, async_safe);
	}

	void
	ui_file::putc (int c)
	{
	char copy = (char) c;
	write (&copy, 1);
	}

	void
	ui_file::vprintf (const char *format, va_list args)
	{
	ui_out_flags flags = disallow_ui_out_field;
	cli_ui_out (this, flags).vmessage (m_applied_style, format, args);
	}

	/* See ui-file.h. */

	void
	ui_file::emit_style_escape (const ui_file_style &style)
	{
	if (can_emit_style_escape () && style != m_applied_style)
	{
	m_applied_style = style;
	this->puts (style.to_ansi ().c_str ());
	}
	}

	/* See ui-file.h. */

	void
	ui_file::reset_style ()
	{
	if (can_emit_style_escape ())
	{
	m_applied_style = ui_file_style ();
	this->puts (m_applied_style.to_ansi ().c_str ());
	}
	}

	/* See ui-file.h. */

	void
	ui_file::printchar (int c, int quoter, bool async_safe)
	{
	char buf[4];
	int out = 0;

	c &= 0xFF; /* Avoid sign bit follies */

	if (c < 0x20 /* Low control chars */
	\|\| (c >= 0x7F && c < 0xA0) /* DEL, High controls */
	\|\| (sevenbit_strings && c >= 0x80))
	{ /* high order bit set */
	buf[out++] = '\\';

	switch (c)
	{
	case '\n':
	buf[out++] = 'n';
	break;
	case '\b':
	buf[out++] = 'b';
	break;
	case '\t':
	buf[out++] = 't';
	break;
	case '\f':
	buf[out++] = 'f';
	break;
	case '\r':
	buf[out++] = 'r';
	break;
	case '\033':
	buf[out++] = 'e';
	break;
	case '\007':
	buf[out++] = 'a';
	break;
	default:
	{
	buf[out++] = '0' + ((c >> 6) & 0x7);
	buf[out++] = '0' + ((c >> 3) & 0x7);
	buf[out++] = '0' + ((c >> 0) & 0x7);
	break;
	}
	}
	}
	else
	{
	if (quoter != 0 && (c == '\\' \|\| c == quoter))
	buf[out++] = '\\';
	buf[out++] = c;
	}

	if (async_safe)
	this->write_async_safe (buf, out);
	else
	this->write (buf, out);
	}



	void
	null_file::write (const char *buf, long sizeof_buf)
	{
	/* Discard the request. */
	}

	void
	null_file::puts (const char *)
	{
	/* Discard the request. */
	}

	void
	null_file::write_async_safe (const char *buf, long sizeof_buf)
	{
	/* Discard the request. */
	}



	/* true if the gdb terminal supports styling, and styling is enabled. */

	static bool
	term_cli_styling ()
	{
	if (!cli_styling)
	return false;

	const char *term = getenv ("TERM");
	/* Windows doesn't by default define $TERM, but can support styles
	regardless. */
	#ifndef _WIN32
	if (term == nullptr \|\| !strcmp (term, "dumb"))
	return false;
	#else
	/* But if they do define $TERM, let us behave the same as on Posix
	platforms, for the benefit of programs which invoke GDB as their
	back-end. */
	if (term && !strcmp (term, "dumb"))
	return false;
	#endif
	return true;
	}



	string_file::~string_file ()
	{}

	void
	string_file::write (const char *buf, long length_buf)
	{
	m_string.append (buf, length_buf);
	}

	/* See ui-file.h. */

	bool
	string_file::term_out ()
	{
	return m_term_out;
	}

	/* See ui-file.h. */

	bool
	string_file::can_emit_style_escape ()
	{
	return m_term_out && term_cli_styling ();
	}



	stdio_file::stdio_file (FILE *file, bool close_p)
	{
	set_stream (file);
	m_close_p = close_p;
	}

	stdio_file::stdio_file ()
	: m_file (NULL),
	m_fd (-1),
	m_close_p (false)
	{}

	stdio_file::~stdio_file ()
	{
	if (m_close_p)
	fclose (m_file);
	}

	void
	stdio_file::set_stream (FILE *file)
	{
	m_file = file;
	m_fd = fileno (file);
	}

	bool
	stdio_file::open (const char name, const char mode)
	{
	/* Close the previous stream, if we own it. */
	if (m_close_p)
	{
	fclose (m_file);
	m_close_p = false;
	}

	gdb_file_up f = gdb_fopen_cloexec (name, mode);

	if (f == NULL)
	return false;

	set_stream (f.release ());
	m_close_p = true;

	return true;
	}

	void
	stdio_file::flush ()
	{
	fflush (m_file);
	}

	long
	stdio_file::read (char *buf, long length_buf)
	{
	/* Wait until at least one byte of data is available, or we get
	interrupted with Control-C. */
	{
	fd_set readfds;

	FD_ZERO (&readfds);
	FD_SET (m_fd, &readfds);
	if (interruptible_select (m_fd + 1, &readfds, NULL, NULL, NULL) == -1)
	return -1;
	}

	return ::read (m_fd, buf, length_buf);
	}

	void
	stdio_file::write (const char *buf, long length_buf)
	{
	/* Calling error crashes when we are called from the exception framework. */
	if (fwrite (buf, length_buf, 1, m_file))
	{
	/* Nothing. */
	}
	}

	void
	stdio_file::write_async_safe (const char *buf, long length_buf)
	{
	/* This is written the way it is to avoid a warning from gcc about not using the
	result of write (since it can be declared with attribute warn_unused_result).
	Alas casting to void doesn't work for this. */
	if (::write (m_fd, buf, length_buf))
	{
	/* Nothing. */
	}
	}

	void
	stdio_file::puts (const char *linebuffer)
	{
	/* This host-dependent function (with implementations in
	posix-hdep.c and mingw-hdep.c) is given the opportunity to
	process the output first in host-dependent way. If it does, it
	should return non-zero, to avoid calling fputs below. */
	if (gdb_console_fputs (linebuffer, m_file))
	return;
	/* Calling error crashes when we are called from the exception framework. */
	if (fputs (linebuffer, m_file))
	{
	/* Nothing. */
	}
	}

	bool
	stdio_file::isatty ()
	{
	return ::isatty (m_fd);
	}

	/* See ui-file.h. */

	bool
	stdio_file::can_emit_style_escape ()
	{
	return (this->isatty ()
	&& term_cli_styling ());
	}



	/* This is the implementation of ui_file method 'write' for stderr.
	gdb_stdout is flushed before writing to gdb_stderr. */

	void
	stderr_file::write (const char *buf, long length_buf)
	{
	gdb_stdout->flush ();
	stdio_file::write (buf, length_buf);
	}

	/* This is the implementation of ui_file method 'puts' for stderr.
	gdb_stdout is flushed before writing to gdb_stderr. */

	void
	stderr_file::puts (const char *linebuffer)
	{
	gdb_stdout->flush ();
	stdio_file::puts (linebuffer);
	}

	stderr_file::stderr_file (FILE *stream)
	: stdio_file (stream)
	{}



	tee_file::tee_file (ui_file *one, ui_file_up &&two)
	: m_one (one),
	m_two (std::move (two))
	{}

	tee_file::~tee_file ()
	{
	}

	void
	tee_file::flush ()
	{
	m_one->flush ();
	m_two->flush ();
	}

	void
	tee_file::write (const char *buf, long length_buf)
	{
	m_one->write (buf, length_buf);
	m_two->write (buf, length_buf);
	}

	void
	tee_file::write_async_safe (const char *buf, long length_buf)
	{
	m_one->write_async_safe (buf, length_buf);
	m_two->write_async_safe (buf, length_buf);
	}

	void
	tee_file::puts (const char *linebuffer)
	{
	m_one->puts (linebuffer);
	m_two->puts (linebuffer);
	}

	bool
	tee_file::isatty ()
	{
	return m_one->isatty ();
	}

	/* See ui-file.h. */

	bool
	tee_file::term_out ()
	{
	return m_one->term_out ();
	}

	/* See ui-file.h. */

	bool
	tee_file::can_emit_style_escape ()
	{
	return (m_one->term_out ()
	&& term_cli_styling ());
	}

	/* See ui-file.h. */

	void
	no_terminal_escape_file::write (const char *buf, long length_buf)
	{
	std::string copy (buf, length_buf);
	this->puts (copy.c_str ());
	}

	/* See ui-file.h. */

	void
	no_terminal_escape_file::puts (const char *buf)
	{
	while (*buf != '\0')
	{
	const char *esc = strchr (buf, '\033');
	if (esc == nullptr)
	break;

	int n_read = 0;
	if (!skip_ansi_escape (esc, &n_read))
	++esc;

	this->stdio_file::write (buf, esc - buf);
	buf = esc + n_read;
	}

	if (*buf != '\0')
	this->stdio_file::write (buf, strlen (buf));
	}

	void
	timestamped_file::write (const char *buf, long len)
	{
	if (debug_timestamp)
	{
	/* Print timestamp if previous print ended with a \n. */
	if (m_needs_timestamp)
	{
	using namespace std::chrono;

	steady_clock::time_point now = steady_clock::now ();
	seconds s = duration_cast<seconds> (now.time_since_epoch ());
	microseconds us = duration_cast<microseconds> (now.time_since_epoch () - s);
	std::string timestamp = string_printf ("%ld.%06ld ",
	(long) s.count (),
	(long) us.count ());
	m_stream->puts (timestamp.c_str ());
	}

	/* Print the message. */
	m_stream->write (buf, len);

	m_needs_timestamp = (len > 0 && buf[len - 1] == '\n');
	}
	else
	m_stream->write (buf, len);
	}