[PATCH v2 11/18] Implement completion limiting for reg_or_group_completer.

[Keith Seitz <keiths at redhat dot com>]

This patch converts reg_or_group_completer to use add_completion
and adds tests for this new behavior.

gdb/ChangeLog

	* completer.c (reg_or_group_completer): Use add_completion.

gdb/testsuite/ChangeLog

	* gdb.base/completion.exp: Add tests for limit completing
	"info reigsters".
---
 gdb/completer.c                       |   15 ++++++++++-----
 gdb/testsuite/gdb.base/completion.exp |    4 ++++
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/gdb/completer.c b/gdb/completer.c
index 85f8d30..bef6953 100644
--- a/gdb/completer.c
+++ b/gdb/completer.c
@@ -1067,17 +1067,22 @@ reg_or_group_completer (struct completer_data *cdata,
        (name = user_reg_map_regnum_to_name (gdbarch, i)) != NULL;
        i++)
     {
-      if (*name != '\0' && strncmp (word, name, len) == 0)
-	VEC_safe_push (char_ptr, result, xstrdup (name));
+      if (*name != '\0' && strncmp (word, name, len) == 0
+	  && (add_completion (cdata, &result, xstrdup (name))
+	      == ADD_COMPLETION_MAX_REACHED))
+	return result;
     }
 
   for (group = reggroup_next (gdbarch, NULL);
        group != NULL;
        group = reggroup_next (gdbarch, group))
     {
-      name = reggroup_name (group);
-      if (strncmp (word, name, len) == 0)
-	VEC_safe_push (char_ptr, result, xstrdup (name));
+      char *match = xstrdup (reggroup_name (group));
+
+      if (strncmp (word, match, len) == 0
+	  && (add_completion (cdata, &result, match)
+	      == ADD_COMPLETION_MAX_REACHED))
+	return result;
     }
 
   return result;
diff --git a/gdb/testsuite/gdb.base/completion.exp b/gdb/testsuite/gdb.base/completion.exp
index d07ca86..4a35cd1 100644
--- a/gdb/testsuite/gdb.base/completion.exp
+++ b/gdb/testsuite/gdb.base/completion.exp
@@ -1037,3 +1037,7 @@ with_test_prefix "interpreter_completer reset" {
     set max_completions $old_max
     gdb_test_no_output "set max-completions $max_completions"
 }
+
+# Test reg_or_group_completer.
+test_completion_limit "info registers " \
+    "info registers \[a-zA-Z0-9\]+" $max_completions