Import readline 7.0 (patch 5)

This imports readline 7.0 (up to patch 5) while preserving all
gdb-local changes.

This was done by checking out the readline git repository, making a
branch based on the gdb baseline revision, applying the gdb changes to
that branch, and then merging from readline 7.

readline/ChangeLog.gdb
2019-08-12  Tom Tromey  <tom@tromey.com>

	* Imported readline 7.0 patch 5.

1 files changed, 44 insertions, 22 deletions

diff --git a/readline/terminal.c b/readline/terminal.c
index 8094186..ef2884e 100644
--- a/readline/terminal.c
+++ b/readline/terminal.c
@@ -1,6 +1,6 @@
 /* terminal.c -- controlling the terminal with termcap. */
 
-/* Copyright (C) 1996-2009 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
 
    This file is part of the GNU Readline Library (Readline), a library
    for reading lines of text with interactive input and history editing.      
@@ -51,15 +51,14 @@
 /* System-specific feature definitions and include files. */
 #include "rldefs.h"
 
-#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
-#  include <sys/ioctl.h>
-#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
-
 #ifdef __MSDOS__
-# include <pc.h>
+#  include <pc.h>
 #endif
 
 #include "rltty.h"
+#if defined (HAVE_SYS_IOCTL_H)
+#  include <sys/ioctl.h>		/* include for declaration of ioctl */
+#endif
 #include "tcap.h"
 
 /* Some standard library routines. */
@@ -81,14 +80,15 @@ static void _win_get_screensize PARAMS((int *, int *));
 static void _emx_get_screensize PARAMS((int *, int *));
 #endif
 
-#define CUSTOM_REDISPLAY_FUNC() (rl_redisplay_function != rl_redisplay)
-#define CUSTOM_INPUT_FUNC() (rl_getc_function != rl_getc)
-
-/*  If the calling application sets this to a non-zero value, readline will
-    use the $LINES and $COLUMNS environment variables to set its idea of the
-    window size before interrogating the kernel. */
+/* If the calling application sets this to a non-zero value, readline will
+   use the $LINES and $COLUMNS environment variables to set its idea of the
+   window size before interrogating the kernel. */
 int rl_prefer_env_winsize = 0;
 
+/* If this is non-zero, readline will set LINES and COLUMNS in the
+   environment when it handles SIGWINCH. */
+int rl_change_environment = 1;
+
 /* **************************************************************** */
 /*								    */
 /*			Terminal and Termcap			    */
@@ -98,7 +98,7 @@ int rl_prefer_env_winsize = 0;
 #ifndef __MSDOS__
 static char *term_buffer = (char *)NULL;
 static char *term_string_buffer = (char *)NULL;
-#endif /* !__MSDOS__ */
+#endif
 
 static int tcap_initialized;
 
@@ -308,7 +308,8 @@ _rl_get_screen_size (tty, ignore_env)
   /* If we're being compiled as part of bash, set the environment
      variables $LINES and $COLUMNS to new values.  Otherwise, just
      do a pair of putenv () or setenv () calls. */
-  sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
+  if (rl_change_environment)
+    sh_set_lines_and_columns (_rl_screenheight, _rl_screenwidth);
 
   if (_rl_term_autowrap == 0)
     _rl_screenwidth--;
@@ -358,7 +359,13 @@ rl_reset_screen_size ()
 {
   _rl_get_screen_size (fileno (rl_instream), 0);
 }
-     
+
+void
+_rl_sigwinch_resize_terminal ()
+{
+  _rl_get_screen_size (fileno (rl_instream), 1);
+}
+	
 void
 rl_resize_terminal ()
 {
@@ -560,7 +567,6 @@ _rl_init_terminal_io (terminal_name)
   term_has_meta = tgetflag ("km") != 0;
   if (term_has_meta == 0)
     _rl_term_mm = _rl_term_mo = (char *)NULL;
-
 #endif /* !__MSDOS__ */
 
   /* Attempt to find and bind the arrow keys.  Do not override already
@@ -694,17 +700,16 @@ rl_ding ()
 	default:
 	  break;
 	case VISIBLE_BELL:
-#ifdef __MSDOS__
-	  ScreenVisualBell ();
-	  break;
-#else
 	  if (_rl_visible_bell)
 	    {
+#ifdef __DJGPP__
+	      ScreenVisualBell ();
+#else
 	      tputs (_rl_visible_bell, 1, _rl_output_character_function);
+#endif
 	      break;
 	    }
 	  /* FALLTHROUGH */
-#endif
 	case AUDIBLE_BELL:
 	  fprintf (stderr, "\007");
 	  fflush (stderr);
@@ -721,12 +726,29 @@ rl_ding ()
 /*								    */
 /* **************************************************************** */
 
+static int enabled_meta = 0;	/* flag indicating we enabled meta mode */
+
 void
 _rl_enable_meta_key ()
 {
 #if !defined (__DJGPP__)
   if (term_has_meta && _rl_term_mm)
-    tputs (_rl_term_mm, 1, _rl_output_character_function);
+    {
+      tputs (_rl_term_mm, 1, _rl_output_character_function);
+      enabled_meta = 1;
+    }
+#endif
+}
+
+void
+_rl_disable_meta_key ()
+{
+#if !defined (__DJGPP__)
+  if (term_has_meta && _rl_term_mo && enabled_meta)
+    {
+      tputs (_rl_term_mo, 1, _rl_output_character_function);
+      enabled_meta = 0;
+    }
 #endif
 }