readline: Extract readline_add_completion_of() from monitor

monitor/misc.h has static add_completion_option().  It's useful
elsewhere in the monitor.  Since it's not monitor-specific, move it to
util/readline.c renamed to readline_add_completion_of(), and put it to
use.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230124121946.1139465-7-armbru@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/util/readline.c b/util/readline.c
index f1ac6e4769..494a3d924e 100644
--- a/util/readline.c
+++ b/util/readline.c
@@ -286,6 +286,14 @@ void readline_add_completion(ReadLineState *rs, const char *str)
     }
 }
 
+void readline_add_completion_of(ReadLineState *rs,
+                                const char *pfx, const char *str)
+{
+    if (!strncmp(str, pfx, strlen(pfx))) {
+        readline_add_completion(rs, str);
+    }
+}
+
 void readline_set_completion_index(ReadLineState *rs, int index)
 {
     rs->completion_index = index;