From 1cde4975c396e8d3e3d801940d58ff081279a777 Mon Sep 17 00:00:00 2001
From: quadratic <spuggel0@gmail.com>
Date: Mon, 2 Feb 2026 22:33:10 +0100
Subject: [PATCH] fix: undefined behaviour in tagmon and tagcrossmon

---
 src/config/parse_config.h  | 1 +
 src/dispatch/bind_define.h | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/config/parse_config.h b/src/config/parse_config.h
index f7ce848..d3337ae 100644
--- a/src/config/parse_config.h
+++ b/src/config/parse_config.h
@@ -990,6 +990,7 @@ FuncType parse_func_name(char *func_name, Arg *arg, char *arg_value,
 		}
 	} else if (strcmp(func_name, "tagmon") == 0) {
 		func = tagmon;
+        (*arg).ui = 0;
 		(*arg).i = parse_direction(arg_value);
 		(*arg).i2 = atoi(arg_value2);
 		if ((*arg).i == UNDIR) {
diff --git a/src/dispatch/bind_define.h b/src/dispatch/bind_define.h
index c0e51dc..062d895 100644
--- a/src/dispatch/bind_define.h
+++ b/src/dispatch/bind_define.h
@@ -1068,7 +1068,7 @@ int32_t tagmon(const Arg *arg) {
 	if (!m || !m->wlr_output->enabled)
 		return 0;
 
-	uint32_t newtags = arg->ui ? arg->ui : arg->i2 ? c->tags : 0;
+	uint32_t newtags = arg->ui != 0 ? arg->ui : arg->i2 != 0 ? c->tags : 1;
 	uint32_t target;
 
 	if (c->mon == m) {
@@ -1730,4 +1730,4 @@ int32_t scroller_stack(const Arg *arg) {
 
 	arrange(selmon, false, false);
 	return 0;
-}
\ No newline at end of file
+}