Handle == and !=

Make process_op handle == and !=, and make eval_arg_num handle != (it
already handled ==).

Signed-off-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 15 insertions, 1 deletions

diff --git a/parse-events.c b/parse-events.c
index 3479675..6ce3427 100644
--- a/parse-events.c
+++ b/parse-events.c
@@ -1144,7 +1144,9 @@ process_op(struct event *event, struct print_arg *arg, char **tok)
                    strcmp(token, "+") == 0 ||
                    strcmp(token, "*") == 0 ||
                    strcmp(token, "^") == 0 ||
-                   strcmp(token, "/") == 0) {
+                   strcmp(token, "/") == 0 ||
+                   strcmp(token, "==") == 0 ||
+                   strcmp(token, "!=") == 0) {
 
                 left = malloc_or_die(sizeof(*left));
 
@@ -1288,6 +1290,18 @@ static long long arg_num_eval(struct print_arg *arg)
 
                         val = left == right;
                         break;
+                case '!':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+
+                        switch (arg->op.op[1]) {
+                        case '=':
+                                val = left != right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
                 default:
                         die("unknown op '%s'", arg->op.op);
                 }