qemu-error: remove dependency of stubs on monitor

Leave the implementation of error_vprintf and error_vprintf_unless_qmp
(the latter now trivially wrapped by error_printf_unless_qmp) to
libqemustub.a and monitor.c.  This has two advantages: it lets us
remove the monitor_printf and monitor_vprintf stubs, and it lets
tests provide a different implementation of the functions that uses
g_test_message.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1477326663-67817-2-git-send-email-pbonzini@redhat.com>

include/qemu/error-report.h

@@ -32,6 +32,7 @@ void loc_set_file(const char *fname, int lno);
 
 void error_vprintf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
 void error_printf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+void error_vprintf_unless_qmp(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
 void error_printf_unless_qmp(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 void error_set_progname(const char *argv0);
 void error_vreport(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);

monitor.c

@@ -3955,6 +3955,27 @@ static void monitor_readline_flush(void *opaque)
     monitor_flush(opaque);
 }
 
+/*
+ * Print to current monitor if we have one, else to stderr.
+ * TODO should return int, so callers can calculate width, but that
+ * requires surgery to monitor_vprintf().  Left for another day.
+ */
+void error_vprintf(const char *fmt, va_list ap)
+{
+    if (cur_mon && !monitor_cur_is_qmp()) {
+        monitor_vprintf(cur_mon, fmt, ap);
+    } else {
+        vfprintf(stderr, fmt, ap);
+    }
+}
+
+void error_vprintf_unless_qmp(const char *fmt, va_list ap)
+{
+    if (cur_mon && !monitor_cur_is_qmp()) {
+        monitor_vprintf(cur_mon, fmt, ap);
+    }
+}
+
 static void __attribute__((constructor)) monitor_lock_init(void)
 {
     qemu_mutex_init(&monitor_lock);

stubs/Makefile.objs

@@ -9,6 +9,7 @@ stub-obj-y += clock-warp.o
 stub-obj-y += cpu-get-clock.o
 stub-obj-y += cpu-get-icount.o
 stub-obj-y += dump.o
+stub-obj-y += error-printf.o
 stub-obj-y += fdset-add-fd.o
 stub-obj-y += fdset-find-fd.o
 stub-obj-y += fdset-get-fd.o
@@ -23,7 +24,6 @@ stub-obj-y += is-daemonized.o
 stub-obj-y += machine-init-done.o
 stub-obj-y += migr-blocker.o
 stub-obj-y += mon-is-qmp.o
-stub-obj-y += mon-printf.o
 stub-obj-y += monitor-init.o
 stub-obj-y += notify-event.o
 stub-obj-y += qtest.o

stubs/error-printf.c

@@ -0,0 +1,13 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+
+void error_vprintf(const char *fmt, va_list ap)
+{
+    vfprintf(stderr, fmt, ap);
+}
+
+void error_vprintf_unless_qmp(const char *fmt, va_list ap)
+{
+    error_vprintf(fmt, ap);
+}

stubs/mon-printf.c

@@ -1,11 +0,0 @@
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "monitor/monitor.h"
-
-void monitor_printf(Monitor *mon, const char *fmt, ...)
-{
-}
-
-void monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
-{
-}

util/qemu-error.c

@@ -14,24 +14,6 @@
 #include "monitor/monitor.h"
 #include "qemu/error-report.h"
 
-/*
- * Print to current monitor if we have one, else to stderr.
- * TODO should return int, so callers can calculate width, but that
- * requires surgery to monitor_vprintf().  Left for another day.
- */
-void error_vprintf(const char *fmt, va_list ap)
-{
-    if (cur_mon && !monitor_cur_is_qmp()) {
-        monitor_vprintf(cur_mon, fmt, ap);
-    } else {
-        vfprintf(stderr, fmt, ap);
-    }
-}
-
-/*
- * Print to current monitor if we have one, else to stderr.
- * TODO just like error_vprintf()
- */
 void error_printf(const char *fmt, ...)
 {
     va_list ap;
@@ -45,11 +27,9 @@ void error_printf_unless_qmp(const char *fmt, ...)
 {
     va_list ap;
 
-    if (!monitor_cur_is_qmp()) {
+    va_start(ap, fmt);
-        va_start(ap, fmt);
+    error_vprintf_unless_qmp(fmt, ap);
-        error_vprintf(fmt, ap);
+    va_end(ap);
-        va_end(ap);
-    }
 }
 
 static Location std_loc = {