trace: Simplify how st_print_trace_file_status() prints

st_print_trace_file_status() takes an fprintf()-like callback and a
FILE * to pass to it.

Its only caller hmp_trace_file() passes monitor_fprintf() and the
current monitor cast to FILE *.  monitor_fprintf() casts it right
back, and is otherwise identical to monitor_printf().  The
type-punning is ugly.

Drop the callback, and call qemu_printf() instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190417191805.28198-3-armbru@redhat.com>

3 files changed, 6 insertions, 5 deletions

diff --git a/monitor.c b/monitor.c
index 10be8bdb86..a3e66b7159 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1056,7 +1056,7 @@ static void hmp_trace_file(Monitor *mon, const QDict *qdict)
     const char *arg = qdict_get_try_str(qdict, "arg");
 
     if (!op) {
-        st_print_trace_file_status((FILE *)mon, &monitor_fprintf);
+        st_print_trace_file_status();
     } else if (!strcmp(op, "on")) {
         st_set_trace_file_enabled(true);
     } else if (!strcmp(op, "off")) {
diff --git a/trace/simple.c b/trace/simple.c
index ac904eca91..fc7106ec49 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -16,6 +16,7 @@
 #include "trace/control.h"
 #include "trace/simple.h"
 #include "qemu/error-report.h"
+#include "qemu/qemu-print.h"
 
 /** Trace file header event ID, picked to avoid conflict with real event IDs */
 #define HEADER_EVENT_ID (~(uint64_t)0)
@@ -363,10 +364,10 @@ void st_set_trace_file(const char *file)
     st_set_trace_file_enabled(true);
 }
 
-void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
+void st_print_trace_file_status(void)
 {
-    stream_printf(stream, "Trace file \"%s\" %s.\n",
-                  trace_file_name, trace_fp ? "on" : "off");
+    qemu_printf("Trace file \"%s\" %s.\n",
+                trace_file_name, trace_fp ? "on" : "off");
 }
 
 void st_flush_trace_buffer(void)
diff --git a/trace/simple.h b/trace/simple.h
index 9931808c05..5771a0634f 100644
--- a/trace/simple.h
+++ b/trace/simple.h
@@ -11,7 +11,7 @@
 #ifndef TRACE_SIMPLE_H
 #define TRACE_SIMPLE_H
 
-void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
+void st_print_trace_file_status(void);
 void st_set_trace_file_enabled(bool enable);
 void st_set_trace_file(const char *file);
 bool st_init(void);