A few tweaks required to use Readline as part of the DJGPP port of GDB.

readline/ChangeLog.Cygnus

@@ -1,3 +1,21 @@
+2000-07-10  Eli Zaretskii  <eliz@is.elta.co.il>
+
+	* terminal.c (_rl_get_screen_size) [__DJGPP__]: Determine screen
+	size via DJGPP-specific calls.
+	(_rl_init_terminal_io) [__MSDOS__]: DJGPP-specific terminal
+	initialization.
+	(_rl_backspace) [__MSDOS__]: Don't call tputs.
+	(ding) [__MSDOS__]: Use DJGPP-specific calls to support visible
+	bell.
+
+	* display.c (_rl_move_vert) [__MSDOS__]: Support cursor movement
+	upwards with DJGPP-specific calls.
+	(_rl_clear_to_eol) [__MSDOS__]: Don't call tputs.
+	(_rl_clear_screen) [__MSDOS__]: Support clear-screen with
+	DJGPP-specific calls.
+	(insert_some_chars) [__MSDOS__]: Don't call tputs.
+	(delete_chars) [__MSDOS__]: Don't call tputs.
+
 2000-07-09  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
 
         * Import of readline 4.1.

readline/display.c

@@ -41,6 +41,10 @@
 
 #include <stdio.h>
 
+#ifdef __MSDOS__
+# include <pc.h>
+#endif
+
 /* System-specific feature definitions and include files. */
 #include "rldefs.h"
 
@@ -1224,9 +1228,18 @@ _rl_move_vert (to)
     }
   else
     {			/* delta < 0 */
+#ifdef __MSDOS__
+      int row, col;
+
+      i = fflush (rl_outstream); /* make sure the cursor pos is current! */
+      ScreenGetCursor (&row, &col);
+      ScreenSetCursor ((row + to - _rl_last_v_pos), col);
+      delta = i;
+#else /* !__MSDOS__ */
       if (term_up && *term_up)
 	for (i = 0; i < -delta; i++)
 	  tputs (term_up, 1, _rl_output_character_function);
+#endif /* !__MSDOS__ */
     }
 
   _rl_last_v_pos = to;		/* Now TO is here */
@@ -1436,9 +1449,12 @@ void
 _rl_clear_to_eol (count)
      int count;
 {
+#ifndef __MSDOS__
   if (term_clreol)
     tputs (term_clreol, 1, _rl_output_character_function);
-  else if (count)
+  else
+#endif
+  if (count)
     space_to_eol (count);
 }
 
@@ -1459,10 +1475,15 @@ space_to_eol (count)
 void
 _rl_clear_screen ()
 {
+#if defined (__GO32__)
+  ScreenClear ();	/* FIXME: only works in text modes */
+  ScreenSetCursor (0, 0);  /* term_clrpag is "cl" which homes the cursor */
+#else
   if (term_clrpag)
     tputs (term_clrpag, 1, _rl_output_character_function);
   else
     crlf ();
+#endif
 }
 
 /* Insert COUNT characters from STRING to the output stream. */
@@ -1471,6 +1492,9 @@ insert_some_chars (string, count)
      char *string;
      int count;
 {
+#ifdef __MSDOS__
+  _rl_output_some_chars (string, count);
+#else  /* !__MSDOS__ */
   /* If IC is defined, then we do not have to "enter" insert mode. */
   if (term_IC)
     {
@@ -1503,6 +1527,7 @@ insert_some_chars (string, count)
       if (term_ei && *term_ei)
 	tputs (term_ei, 1, _rl_output_character_function);
     }
+#endif /* !__MSDOS__ */
 }
 
 /* Delete COUNT characters from the display line. */
@@ -1513,6 +1538,7 @@ delete_chars (count)
   if (count > screenwidth)	/* XXX */
     return;
 
+#ifndef __MSDOS__
   if (term_DC && *term_DC)
     {
       char *buffer;
@@ -1525,6 +1551,7 @@ delete_chars (count)
 	while (count--)
 	  tputs (term_dc, 1, _rl_output_character_function);
     }
+#endif /* !__MSDOS__ */
 }
 
 void

readline/terminal.c

@@ -55,6 +55,10 @@
 #  include <sys/ioctl.h>
 #endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
 
+#ifdef __MSDOS__
+# include <pc.h>
+#endif
+
 #include "rltty.h"
 #include "tcap.h"
 
@@ -71,13 +75,15 @@
 /*								    */
 /* **************************************************************** */
 
+#ifndef __MSDOS__
 static char *term_buffer = (char *)NULL;
 static char *term_string_buffer = (char *)NULL;
 
-static int tcap_initialized;
-
 /* Non-zero means this terminal can't really do anything. */
 static int dumb_term;
+#endif /* !__MSDOS__ */
+
+static int tcap_initialized;
 
 #if !defined (__linux__)
 #  if defined (__EMX__) || defined (NEED_EXTERN_PC)
@@ -185,7 +191,10 @@ _rl_get_screen_size (tty, ignore_env)
       if (ignore_env == 0 && (ss = get_env_value ("COLUMNS")))
 	screenwidth = atoi (ss);
 
-#if !defined (__DJGPP__)
+#if defined (__DJGPP__)
+      if (screenwidth <= 0)
+	screenwidth = ScreenCols ();
+#else
       if (screenwidth <= 0 && term_string_buffer)
 	screenwidth = tgetnum ("co");
 #endif
@@ -198,7 +207,10 @@ _rl_get_screen_size (tty, ignore_env)
       if (ignore_env == 0 && (ss = get_env_value ("LINES")))
 	screenheight = atoi (ss);
 
-#if !defined (__DJGPP__)
+#if defined (__DJGPP__)
+      if (screenheight <= 0)
+	screenheight = ScreenRows ();
+#else
       if (screenheight <= 0 && term_string_buffer)
 	screenheight = tgetnum ("li");
 #endif
@@ -318,6 +330,16 @@ _rl_init_terminal_io (terminal_name)
   if (term == 0)
     term = "dumb";
 
+#ifdef __MSDOS__
+  term_im = term_ei = term_ic = term_IC = (char *)NULL;
+  term_up = term_dc = term_DC = visible_bell = (char *)NULL;
+  term_ku = term_kd = term_kl = term_kr = (char *)NULL;
+  term_mm = term_mo = (char *)NULL;
+  terminal_can_insert = term_has_meta = _rl_term_autowrap = 0;
+  term_cr = "\r";
+
+  _rl_get_screen_size (tty, 0);
+#else  /* !__MSDOS__ */
   /* I've separated this out for later work on not calling tgetent at all
      if the calling application has supplied a custom redisplay function,
      (and possibly if the application has supplied a custom input function). */
@@ -410,6 +432,8 @@ _rl_init_terminal_io (terminal_name)
   if (!term_has_meta)
     term_mm = term_mo = (char *)NULL;
 
+#endif /* !__MSDOS__ */
+
   /* Attempt to find and bind the arrow keys.  Do not override already
      bound keys in an overzealous attempt, however. */
   xkeymap = _rl_keymap;
@@ -498,10 +522,12 @@ _rl_backspace (count)
 {
   register int i;
 
+#ifndef __MSDOS__
   if (term_backspace)
     for (i = 0; i < count; i++)
       tputs (term_backspace, 1, _rl_output_character_function);
   else
+#endif
     for (i = 0; i < count; i++)
       putc ('\b', _rl_out_stream);
   return 0;
@@ -531,11 +557,16 @@ ding ()
 	default:
 	  break;
 	case VISIBLE_BELL:
+#ifdef __MSDOS__
+	  ScreenVisualBell ();
+	  break;
+#else
 	  if (visible_bell)
 	    {
 	      tputs (visible_bell, 1, _rl_output_character_function);
 	      break;
 	    }
+#endif
 	  /* FALLTHROUGH */
 	case AUDIBLE_BELL:
 	  fprintf (stderr, "\007");