Improve MinGW support in Readline

These changes were already accepted upstream in Readline,
but GDB did not yet import a newer Readline version.

readline/Changelog.gdb:

	* util.c: Include rlshell.h.
	(_rl_tropen) [_WIN32 && !__CYGWIN__]: Open the trace file in the
	user's temporary directory.
	* tcap.h [HAVE_NCURSES_TERMCAP_H]: Include ncurses/termcap.h.
	* input.c (w32_isatty) [_WIN32 && !__CYGWIN__]: New function, to
	replace isatty that is not reliable enough on MS-Windows.
	(isatty) [_WIN32 && !__CYGWIN__]: Redirect to w32_isatty.
	(rl_getc): Call _getch, not getch, which could be an ncurses
	function when linked with ncurses, in which case getch will return
	EOF for any keystroke, because there's no curses window.
	* tilde.c (tilde_expand_word) [_WIN32]:
	* histfile.c (history_filename) [_WIN32]: Windows-specific
	environment variable to replace HOME if that is undefined.
	* funmap.c (default_funmap): Compile rl_paste_from_clipboard on
	all Windows platforms, not just Cygwin.
	* readline.h (rl_paste_from_clipboard): Include declaration for
	all Windows platforms.
	* display.c (insert_some_chars, delete_chars): Don't use the
	MinGW-specific code if linked with ncurses.
	* configure.in:
	* config.h.in: Support ncurses/termcap.h.  The configure script
	was updated accordingly.
	* complete.c [_WIN32 && !__CYGWIN__]: Initialize
	_rl_completion_case_fold to 1.
	(printable_part, rl_filename_completion_function)
	[_WIN32 && !__CYGWIN__]: Handle the drive letter.

14 files changed, 125 insertions, 11 deletions

diff --git a/readline/ChangeLog.gdb b/readline/ChangeLog.gdb
index 43abd19..91e1dbd 100644
--- a/readline/ChangeLog.gdb
+++ b/readline/ChangeLog.gdb
@@ -1,3 +1,40 @@
+2016-09-17  Eli Zaretskii  <eliz@gnu.org>
+
+	* util.c: Include rlshell.h.
+	(_rl_tropen) [_WIN32 && !__CYGWIN__]: Open the trace file in the
+	user's temporary directory.
+
+	* tcap.h [HAVE_NCURSES_TERMCAP_H]: Include ncurses/termcap.h.
+
+	* input.c (w32_isatty) [_WIN32 && !__CYGWIN__]: New function, to
+	replace isatty that is not reliable enough on MS-Windows.
+	(isatty) [_WIN32 && !__CYGWIN__]: Redirect to w32_isatty.
+	(rl_getc): Call _getch, not getch, which could be an ncurses
+	function when linked with ncurses, in which case getch will return
+	EOF for any keystroke, because there's no curses window.
+
+	* tilde.c (tilde_expand_word) [_WIN32]:
+	* histfile.c (history_filename) [_WIN32]: Windows-specific
+	environment variable to replace HOME if that is undefined.
+
+	* funmap.c (default_funmap): Compile rl_paste_from_clipboard on
+	all Windows platforms, not just Cygwin.
+
+	* readline.h (rl_paste_from_clipboard): Include declaration for
+	all Windows platforms.
+
+	* display.c (insert_some_chars, delete_chars): Don't use the
+	MinGW-specific code if linked with ncurses.
+
+	* configure.in:
+	* config.h.in: Support ncurses/termcap.h.  The configure script
+	was updated accordingly.
+
+	* complete.c [_WIN32 && !__CYGWIN__]: Initialize
+	_rl_completion_case_fold to 1.
+	(printable_part, rl_filename_completion_function)
+	[_WIN32 && !__CYGWIN__]: Handle the drive letter.
+
 2014-12-30  Eli Zaretskii  <eliz@gnu.org>
 
 	* complete.c (stat_char) [_WIN32]: Don't use 'access' and X_OK on
diff --git a/readline/complete.c b/readline/complete.c
index a5ce803..5733d4e 100644
--- a/readline/complete.c
+++ b/readline/complete.c
@@ -156,7 +156,8 @@ int _rl_complete_mark_symlink_dirs = 0;
 int _rl_print_completions_horizontally;
 
 /* Non-zero means that case is not significant in filename completion. */
-#if defined (__MSDOS__) && !defined (__DJGPP__)
+#if defined (__MSDOS__) && !defined (__DJGPP__)	\
+  || (defined (_WIN32) && !defined (__CYGWIN__))
 int _rl_completion_case_fold = 1;
 #else
 int _rl_completion_case_fold = 0;
@@ -636,7 +637,7 @@ printable_part (pathname)
     return (pathname);
 
   temp = strrchr (pathname, '/');
-#if defined (__MSDOS__)
+#if defined (__MSDOS__) || defined (_WIN32)
   if (temp == 0 && ISALPHA ((unsigned char)pathname[0]) && pathname[1] == ':')
     temp = pathname + 1;
 #endif
@@ -2186,7 +2187,7 @@ rl_filename_completion_function (text, state)
 
       temp = strrchr (dirname, '/');
 
-#if defined (__MSDOS__)
+#if defined (__MSDOS__) || defined (_WIN32)
       /* special hack for //X/... */
       if (dirname[0] == '/' && dirname[1] == '/' && ISALPHA ((unsigned char)dirname[2]) && dirname[3] == '/')
         temp = strrchr (dirname + 3, '/');
@@ -2197,7 +2198,7 @@ rl_filename_completion_function (text, state)
 	  strcpy (filename, ++temp);
 	  *temp = '\0';
 	}
-#if defined (__MSDOS__)
+#if defined (__MSDOS__) || (defined (_WIN32) && !defined (__CYGWIN__))
       /* searches from current directory on the drive */
       else if (ISALPHA ((unsigned char)dirname[0]) && dirname[1] == ':')
         {
diff --git a/readline/config.h.in b/readline/config.h.in
index 8560c4b..86d86cf 100644
--- a/readline/config.h.in
+++ b/readline/config.h.in
@@ -186,6 +186,9 @@
 /* Define if you have the <termcap.h> header file.  */
 #undef HAVE_TERMCAP_H
 
+/* Define if you have the <ncurses/termcap.h> header file.  */
+#undef HAVE_NCURSES_TERMCAP_H
+
 /* Define if you have the <termio.h> header file.  */
 #undef HAVE_TERMIO_H
 
diff --git a/readline/configure b/readline/configure
index 09de45d..249ab7b 100755
--- a/readline/configure
+++ b/readline/configure
@@ -5845,6 +5845,23 @@ if test "$TERMCAP_LIB" = "./lib/termcap/libtermcap.a"; then
 	fi
 fi
 
+if test "$TERMCAP_LIB" = "-lncurses"; then
+
+for ac_header in ncurses/termcap.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+eval as_val=\$$as_ac_Header
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+fi
 
 for ac_header in wctype.h
 do :
diff --git a/readline/configure.in b/readline/configure.in
index b395af4..b6d7167 100644
--- a/readline/configure.in
+++ b/readline/configure.in
@@ -198,6 +198,9 @@ if test "$TERMCAP_LIB" = "./lib/termcap/libtermcap.a"; then
 		TERMCAP_LIB=-ltermcap	#default
 	fi
 fi
+if test "$TERMCAP_LIB" = "-lncurses"; then
+	AC_CHECK_HEADERS(ncurses/termcap.h)
+fi
 
 BASH_CHECK_MULTIBYTE
 
diff --git a/readline/display.c b/readline/display.c
index 7653d87..9044305 100644
--- a/readline/display.c
+++ b/readline/display.c
@@ -2374,7 +2374,7 @@ insert_some_chars (string, count, col)
      char *string;
      int count, col;
 {
-#if defined (__MSDOS__) || defined (__MINGW32__)
+#if defined (__MSDOS__) || (defined (__MINGW32__) && !defined (NCURSES_VERSION))
   _rl_output_some_chars (string, count);
 #else
   /* DEBUGGING */
@@ -2426,7 +2426,7 @@ delete_chars (count)
   if (count > _rl_screenwidth)	/* XXX */
     return;
 
-#if !defined (__MSDOS__) && !defined (__MINGW32__)
+#if !defined (__MSDOS__) && !(defined (__MINGW32__) && !defined (NCURSES_VERSION))
   if (_rl_term_DC && *_rl_term_DC)
     {
       char *buffer;
diff --git a/readline/funmap.c b/readline/funmap.c
index 86e375f..e61d69f 100644
--- a/readline/funmap.c
+++ b/readline/funmap.c
@@ -113,7 +113,7 @@ static const FUNMAP default_funmap[] = {
   { "non-incremental-reverse-search-history-again", rl_noninc_reverse_search_again },
   { "old-menu-complete", rl_old_menu_complete },
   { "overwrite-mode", rl_overwrite_mode },
-#ifdef __CYGWIN__
+#ifdef _WIN32
   { "paste-from-clipboard", rl_paste_from_clipboard },
 #endif
   { "possible-completions", rl_possible_completions },
diff --git a/readline/histfile.c b/readline/histfile.c
index 30a6182..fffeb3f 100644
--- a/readline/histfile.c
+++ b/readline/histfile.c
@@ -123,6 +123,10 @@ history_filename (filename)
     return (return_val);
   
   home = sh_get_env_value ("HOME");
+#ifdef _WIN32
+  if (!home)
+    home = sh_get_env_value ("APPDATA");
+#endif
 
   if (home == 0)
     {
diff --git a/readline/input.c b/readline/input.c
index 7c74c99..e35277f 100644
--- a/readline/input.c
+++ b/readline/input.c
@@ -86,6 +86,36 @@ static int ibuffer_space PARAMS((void));
 static int rl_get_char PARAMS((int *));
 static int rl_gather_tyi PARAMS((void));
 
+#if defined (_WIN32) && !defined (__CYGWIN__)
+
+/* 'isatty' in the Windows runtime returns non-zero for every
+   character device, including the null device.  Repair that.  */
+#include <io.h>
+#define WIN32_LEAN_AND_MEAN 1
+#include <windows.h>
+
+int w32_isatty (int fd)
+{
+  if (_isatty(fd))
+    {
+      HANDLE h = (HANDLE) _get_osfhandle (fd);
+      DWORD ignored;
+
+      if (h == INVALID_HANDLE_VALUE)
+	{
+	  errno = EBADF;
+	  return 0;
+	}
+      if (GetConsoleMode (h, &ignored) != 0)
+	return 1;
+    }
+  errno = ENOTTY;
+  return 0;
+}
+
+#define isatty(x)  w32_isatty(x)
+#endif
+
 /* **************************************************************** */
 /*								    */
 /*			Character Input Buffering       	    */
@@ -465,8 +495,10 @@ rl_getc (stream)
       RL_CHECK_SIGNALS ();
 
 #if defined (__MINGW32__)
+      /* Use _getch to make sure we call the function from MS runtime,
+	 even if some curses library is linked in.  */
       if (isatty (fileno (stream)))
-	return (getch ());
+	return (_getch ());
 #endif
       result = read (fileno (stream), &c, sizeof (unsigned char));
 
diff --git a/readline/kill.c b/readline/kill.c
index 1a78783..ce26d0a 100644
--- a/readline/kill.c
+++ b/readline/kill.c
@@ -657,7 +657,7 @@ rl_yank_last_arg (count, key)
 }
 
 /* A special paste command for users of Cygnus's cygwin32. */
-#if defined (__CYGWIN__)
+#if defined (_WIN32)
 #include <windows.h>
 
 int
diff --git a/readline/readline.h b/readline/readline.h
index 0de168c..9772746 100644
--- a/readline/readline.h
+++ b/readline/readline.h
@@ -172,8 +172,8 @@ extern int rl_yank PARAMS((int, int));
 extern int rl_yank_pop PARAMS((int, int));
 extern int rl_yank_nth_arg PARAMS((int, int));
 extern int rl_yank_last_arg PARAMS((int, int));
-/* Not available unless __CYGWIN__ is defined. */
-#ifdef __CYGWIN__
+/* Not available unless _WIN32 is defined. */
+#ifdef _WIN32
 extern int rl_paste_from_clipboard PARAMS((int, int));
 #endif
 
diff --git a/readline/tcap.h b/readline/tcap.h
index 9d09b7a..dbc1789 100644
--- a/readline/tcap.h
+++ b/readline/tcap.h
@@ -31,6 +31,8 @@
 #    include "rltty.h"
 #  endif
 #  include <termcap.h>
+#elif defined (HAVE_NCURSES_TERMCAP_H)
+#  include <ncurses/termcap.h>
 #else
 
 /* On Solaris2, sys/types.h #includes sys/reg.h, which #defines PC.
diff --git a/readline/tilde.c b/readline/tilde.c
index 1c53a45..d4c1da9 100644
--- a/readline/tilde.c
+++ b/readline/tilde.c
@@ -360,6 +360,10 @@ tilde_expand_word (filename)
     {
       /* Prefix $HOME to the rest of the string. */
       expansion = sh_get_env_value ("HOME");
+#ifdef _WIN32
+      if (!expansion)
+	expansion = sh_get_env_value ("APPDATA");
+#endif
 
       /* If there is no HOME variable, look up the directory in
 	 the password database. */
diff --git a/readline/util.c b/readline/util.c
index 321dee2..d402fce 100644
--- a/readline/util.c
+++ b/readline/util.c
@@ -55,6 +55,7 @@
 
 #include "rlprivate.h"
 #include "xmalloc.h"
+#include "rlshell.h"
 
 /* **************************************************************** */
 /*								    */
@@ -507,7 +508,17 @@ _rl_tropen ()
 
   if (_rl_tracefp)
     fclose (_rl_tracefp);
+#if defined (_WIN32) && !defined (__CYGWIN__)
+  /* Windows doesn't have /var/tmp, so open the trace file in the
+     user's temporary directory instead.  */
+  sprintf (fnbuf, "%s/rltrace.%ld",
+	   (sh_get_env_value ("TEMP")
+	    ? sh_get_env_value ("TEMP")
+	    : "."),
+	   getpid());
+#else
   sprintf (fnbuf, "/var/tmp/rltrace.%ld", getpid());
+#endif
   unlink(fnbuf);
   _rl_tracefp = fopen (fnbuf, "w+");
   return _rl_tracefp != 0;