Sync readline/ to version 7.0 alpha

This patch syncs our upstream copy of readline from version 6.2 to the
latest version, 7.0 alpha (released July 10 2015).

I essentially copied what was done the last time readline was synced,
when Jan updated to readline 6.2 in 2011:
http://sourceware.org/ml/gdb-patches/2011-05/msg00003.html

Procedure:

1. I extracted the readline-7.0-alpha tarball on top of readline/.
2. I deleted all the new files under doc/ that were deliberately omitted
   before.
3. I regenerated readline/configure and readline/examples/rlfe/configure
   using autoconf 2.64.  No other configure files need regenerating.
4. I updated the function gdb_printable_part in completer.c with a
   trivial change made to the readline function it is based off of,
   printable_part in readline/complete.c.  There is more work to be done in
   completer.c to sync it with readline/complete.c, but it is non-trivial
   and should probably be done separately anyway.

Local patches that had to be reapplied:

    None.  readline 7.0 alpha contains all of our local readline
    patches.

New files in readline/:

    colors.{c,h}
    examples/{hist_erasedups,hist_purgecmd,rl-callbacktest,rlbasic}.c
    parse-colors.{c,h}
    readline.pc.in
    configure.ac

Deleted files in readline/:

    configure.in

Regressions:

After the sync there is one testsuite regression, the test
"signal SIGINT" in gdb.gdb/selftest.exp which now FAILs.  Previously,
the readline 6.2 SIGINT handler would temporarily reinstall the
underlying application's SIGINT handler and immediately re-raise SIGINT
so that the orginal handler gets invoked.  But now (since readline 6.3)
its SIGINT handler does not re-raise SIGINT or directly invoke the
original handler; it now sets a flag marking that SIGINT was raised, and
waits until readline explicitly has control to call the application's
SIGINT handler.  Anyway, because SIGINT is no longer re-raised from
within readline's SIGINT handler, doing "signal SIGINT" with a stopped
inferior gdb process will no longer resume and then immediately stop the
process (since there is no 2nd SIGINT to immediately catch).  Instead,
the inferior gdb process will now just print "Quit" and continue to run.
So with this commit, this particular test case is adjusted to reflect
this change in behavior (we now have to send a 2nd SIGINT manually to
stop it).

Aside from this one testsuite regression, I personally noticed no
regression in user-visible behavior.  Though I only tested on x86_64
and on i686 Debian Stretch.

Getting this kind of change in at the start of the GDB 7.11 development
cycle will allow us to get a lot of passive testing from developers and
from bleeding-edge users.

readline/ChangeLog.gdb:

	Import readline 7.0 alpha
	* configure: Regenerate.
	* examples/rlfe/configure: Regenerate.

gdb/ChangeLog:

	* completer.c (gdb_printable_part): Sync with readline function
	it is based off of.

gdb/testsuite/ChangeLog:

	* gdb.gdb/selftest.exp (test_with_self): Update test to now
	expect the GDB inferior to no longer immediately stop after
	being resumed with "signal SIGINT".

1 files changed, 151 insertions, 0 deletions

diff --git a/readline/examples/hist_purgecmd.c b/readline/examples/hist_purgecmd.c
new file mode 100644
index 0000000..94becd8
--- /dev/null
+++ b/readline/examples/hist_purgecmd.c
@@ -0,0 +1,151 @@
+/* hist_purgecmd -- remove all instances of command or pattern from history
+   file */
+
+/* Copyright (C) 2011 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.
+
+   Readline 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.
+
+   Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef READLINE_LIBRARY
+#define READLINE_LIBRARY 1
+#endif
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <regex.h>
+
+#ifdef READLINE_LIBRARY
+#  include "history.h"
+#else
+#  include <readline/history.h>
+#endif
+
+#include <string.h>
+
+#define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
+#define STREQN(a, b, n) ((n == 0) ? (1) \
+                                  : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))
+
+extern int history_offset;
+
+#define PURGE_REGEXP	0x01
+
+static void
+usage()
+{
+  fprintf (stderr, "hist_purgecmd: usage: hist_purgecmd [-r] [-t] [-f filename] command-spec\n");
+  exit (2);
+}
+
+int
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  char *fn;
+  int r, flags;
+
+  flags = 0;
+  fn = 0;
+  while ((r = getopt (argc, argv, "f:rt")) != -1)
+    {
+      switch (r)
+	{
+	case 'f':
+	  fn = optarg;
+	  break;
+	case 'r':
+	  flags |= PURGE_REGEXP;
+	  break;
+	case 't':
+	  history_write_timestamps = 1;
+	  break;
+	default:
+	  usage ();
+	}
+    }
+  argv += optind;
+  argc -= optind;
+
+  if (fn == 0)
+    fn = getenv ("HISTFILE");
+  if (fn == 0)
+    {
+      fprintf (stderr, "hist_purgecmd: no history file\n");
+      usage ();
+    }
+
+  if ((r = read_history (fn)) != 0)
+    {
+      fprintf (stderr, "hist_purgecmd: read_history: %s: %s\n", fn, strerror (r));
+      exit (1);
+    }
+
+  for (r = 0; r < argc; r++)
+    hist_purgecmd (argv[r], flags);
+
+  if ((r = write_history (fn)) != 0)
+    {
+      fprintf (stderr, "hist_purgecmd: write_history: %s: %s\n", fn, strerror (r));
+      exit (1);
+    }
+
+  exit (0);
+}
+
+int
+hist_purgecmd (cmd, flags)
+     char *cmd;
+     int flags;
+{
+  int r, n, rflags;
+  HIST_ENTRY *temp;
+  regex_t regex = { 0 };
+
+  if (flags & PURGE_REGEXP)
+    {
+      rflags = REG_EXTENDED|REG_NOSUB;
+      if (regcomp (&regex, cmd, rflags))
+	{
+	  fprintf (stderr, "hist_purgecmd: %s: invalid regular expression\n", cmd);
+	  return -1;
+	}
+    }
+
+  r = 0;
+  using_history ();
+  r = where_history ();
+  for (n = 0; n < r; n++)
+    {
+      temp = history_get (n+history_base);
+      if (((flags & PURGE_REGEXP) && (regexec (&regex, temp->line, 0, 0, 0) == 0)) ||
+	  ((flags & PURGE_REGEXP) == 0 && STREQ (temp->line, cmd)))
+	{
+	  remove_history (n);
+	  r--;			/* have to get one fewer now */
+	  n--;			/* compensate for above increment */
+	  history_offset--;	/* moving backwards in history list */
+	}
+    }
+  using_history ();
+
+  if (flags & PURGE_REGEXP)
+    regfree (&regex);
+
+  return r;
+}