[PATCH v3 16/19] Implement completion limiting for tui_reggroup_completer.

[Keith Seitz <keiths@redhat.com>]

This is a new patch in the series.

--

This patch converts the (recently introduced) TUI register/group
completer, tui_reggroup_completer, to use add_completion.

gdb/ChangeLog

	* tui/tui-regs.c (tui_reggroup_completer): Use add_completion
	to add completions to the completion list.

gdb/testsuite/ChangeLog

	* completion.exp: Add a completion-limit test for "tui reg".
---
 gdb/testsuite/gdb.base/completion.exp |    5 +++++
 gdb/tui/tui-regs.c                    |    6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/completion.exp b/gdb/testsuite/gdb.base/completion.exp
index 1036af5..07ce660 100644
--- a/gdb/testsuite/gdb.base/completion.exp
+++ b/gdb/testsuite/gdb.base/completion.exp
@@ -1058,6 +1058,11 @@ if {$signal_to_use != ""} {
 test_completion_limit "print field_test_global.a" \
     "print field_test_global\\\.a\[1-9\]_field" $max_completions
 
+# Test TUI's reg completer
+if {![skip_tui_tests]} {
+    test_completion_limit "tui reg " "tui reg \[a-z\]+" $max_completions
+}
+
 #
 # Test TUI completions
 #
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index 756f598..17efd9f 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -683,7 +683,11 @@ tui_reggroup_completer (struct completer_data *cdata,
   for (tmp = extra; *tmp != NULL; ++tmp)
     {
       if (strncmp (word, *tmp, len) == 0)
-	VEC_safe_push (char_ptr, result, xstrdup (*tmp));
+	{
+	  if (add_completion (cdata, &result, *tmp, NULL, NULL)
+	      == ADD_COMPLETION_MAX_REACHED)
+	    break;
+	}
     }
 
   return result;