parse-events: Add pevent_filter_remove_event()

Create the function pevent_filter_remove_event() that takes an
filter and an event id as its parameters and removes the event
from the given filter.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/parse-filter.c b/parse-filter.c
index aab642c..d2f5c3b 100644
--- a/parse-filter.c
+++ b/parse-filter.c
@@ -768,6 +768,46 @@ static void free_filter_type(struct filter_type *filter_type)
         free_arg(filter_type->filter);
 }
 
+/**
+ * pevent_filter_remove_event - remove a filter for an event
+ * @filter: the event filter to remove from
+ * @event_id: the event to remove a filter for
+ *
+ * Removes the filter saved for an event defined by @event_id
+ * from the @filter.
+ *
+ * Returns 1: if an event was removed
+ *   0: if the event was not found
+ */
+int pevent_filter_remove_event(struct event_filter *filter,
+                               int event_id)
+{
+        struct filter_type *filter_type;
+        unsigned long len;
+
+        if (!filter->filters)
+                return 0;
+
+        filter_type = find_filter_type(filter, event_id);
+
+        if (!filter_type)
+                return 0;
+
+        free_filter_type(filter_type);
+
+        /* The filter_type points into the event_filters array */
+        len = (unsigned long)(filter->event_filters + filter->filters) -
+                (unsigned long)(filter_type + 1);
+
+        memmove(filter_type, filter_type + 1, len);
+        filter->filters--;
+
+        memset(&filter->event_filters[filter->filters], 0,
+               sizeof(*filter_type));
+
+        return 1;
+}
+
 void pevent_filter_free(struct event_filter *filter)
 {
         int i;