1 files changed, 39 insertions, 0 deletions
diff --git a/arm9/lib/src/SND_alarm.c b/arm9/lib/src/SND_alarm.c
new file mode 100644
index 00000000..b6178c8d
--- /dev/null
+++ b/arm9/lib/src/SND_alarm.c
@@ -0,0 +1,39 @@
+#include "SND_alarm.h"
+
+struct AlarmCallback {
+    SNDAlarmCallback cb;
+    void *data;
+    u8 id;
+};
+
+static struct AlarmCallback sCallbackTable[SND_ALARM_COUNT];
+
+ARM_FUNC void SND_AlarmInit(void) {
+    for (s32 i = 0; i < SND_ALARM_COUNT; i++) {
+        sCallbackTable[i].cb = NULL;
+        sCallbackTable[i].data = NULL;
+        sCallbackTable[i].id = 0;
+    }
+}
+
+ARM_FUNC void SNDi_IncAlarmId(u32 idx) {
+    struct AlarmCallback *ac = &sCallbackTable[idx];
+    ac->id++;
+}
+
+ARM_FUNC u8 SNDi_SetAlarmHandler(u32 idx, SNDAlarmCallback cb, void *data) {
+    struct AlarmCallback *ac = &sCallbackTable[idx];
+    ac->cb = cb;
+    ac->data = data;
+    ac->id++;
+    return ac->id;
+}
+
+ARM_FUNC void SNDi_CallAlarmHandler(s32 idx) {
+    struct AlarmCallback *ac = &sCallbackTable[idx & 0xFF];
+    if (((idx >> 8) & 0xFF) != ac->id)
+        return;
+    if (ac->cb == NULL)
+        return;
+    ac->cb(ac->data);
+}