From 1b63e068ae86c231231df17f98551a2d218694e8 Mon Sep 17 00:00:00 2001
From: Ivan Kuchin <tadump+git@gmail.com>
Date: Sun, 2 Feb 2025 16:55:46 +0100
Subject: [PATCH] stumbled upon _NSSetLogCStringFunction to hide
 IOBluetoothDeviceInquiry debug messages

---
 CHANGELOG.md |  2 ++
 blueutil.m   | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93b290c..8938d9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## unreleased
 
+* Hide debug log messages from IOBluetoothDeviceInquiry [@toy](https://github.com/toy)
+
 ## v2.11.0 (2025-01-18)
 
 * Inform the user on receiving abort signal, that it may be due to absence of permission [#95](https://github.com/toy/blueutil/issues/95) [@toy](https://github.com/toy)
diff --git a/blueutil.m b/blueutil.m
index c249888..89adc96 100644
--- a/blueutil.m
+++ b/blueutil.m
@@ -49,6 +49,8 @@ int assert_reg(int errcode, const regex_t *restrict preg, char *reason) {
 int IOBluetoothPreferenceGetDiscoverableState();
 void IOBluetoothPreferenceSetDiscoverableState(int state);
 
+void _NSSetLogCStringFunction(void(*)(const char*, unsigned, BOOL));
+
 // short names
 typedef int (*GetterFunc)();
 typedef bool (*SetterFunc)(int);
@@ -92,6 +94,19 @@ void check_power_on_for(const char *command) {
   eprintf("Power is required to be on for %s command\n", command);
 }
 
+const char *filter_out_ns_log[] = {
+  "-[IOBluetoothDeviceInquiry initWithDelegate:]",
+  "-[IOBluetoothDeviceInquiry dealloc]",
+};
+
+void CustomNSLogOutput(const char* message, __unused unsigned length, __unused BOOL withSysLogBanner) {
+  for (size_t i = 0, _i = sizeof(filter_out_ns_log) / sizeof(filter_out_ns_log[0]); i < _i; i++) {
+    if (strstr(message, filter_out_ns_log[i]) != NULL) return;
+  }
+
+  eprintf("%s\n", message);
+}
+
 void usage(FILE *io) {
   static const char *lines[] = {
     ("blueutil v" VERSION),
@@ -727,6 +742,8 @@ int main(int argc, char *argv[]) {
     }
   }
 
+  _NSSetLogCStringFunction(CustomNSLogOutput);
+
   if (!BTAvaliable()) {
     eprintf("Error: Bluetooth not available!\n");
     return EX_UNAVAILABLE;