enable stateless library users to configure the logger

[rdmark]

right now users of the stateless library / daemon are forced to use printf logging which isn't ideal, rather we should allow clients to consume the logs for their own logger routines

[rdmark]

this was an attempt that did not quite work

afpfs-ng

diff --git a/daemon/stateless.c b/daemon/stateless.c
index 89f386e..615bafe 100644
--- a/daemon/stateless.c
+++ b/daemon/stateless.c
@@ -307,6 +307,11 @@ void afp_sl_conn_setup(void)
     connection.print = conn_print;
 }
 
+void afp_sl_set_print(void (*fn)(const char *))
+{
+    connection.print = fn;
+}
+
 int afp_sl_exit(void)
 {
     struct afp_server_exit_request req;
diff --git a/include/afpsl.h b/include/afpsl.h
index bd2ca55..3f4ad47 100644
--- a/include/afpsl.h
+++ b/include/afpsl.h
@@ -38,6 +38,7 @@ typedef void   *serverid_t;
 typedef void   *volumeid_t;
 
 void afp_sl_conn_setup(void);
+void afp_sl_set_print(void (*fn)(const char *));
 
 int afp_sl_exit(void);
 int afp_sl_status(const char * volumename, const char * servername,

kio-afp

index a9742d3..157197e 100644
--- a/src/kafp_worker.cpp
+++ b/src/kafp_worker.cpp
@@ -35,7 +35,7 @@ extern "C" {
     #include <afpsl.h>
 }
 
-Q_LOGGING_CATEGORY(logAfp, "kio.afp")
+Q_LOGGING_CATEGORY(logAfp, "kio.afp", QtWarningMsg)
 
 // Read buffer size for get/put operations (64 KiB)
 static constexpr unsigned int READ_CHUNK = 64 * 1024;
@@ -164,6 +164,9 @@ KIO::WorkerResult AfpWorker::ensureConnSetup()
         return KIO::WorkerResult::pass();
 
     afp_sl_conn_setup();
+    afp_sl_set_print([](const char *msg) {
+        qCDebug(logAfp) << "afpsld:" << msg;
+    });
     m_connSetupDone = true;
     return KIO::WorkerResult::pass();
 }