[Qemu-devel] [PATCH] error-report: Add info_report_once helper

[Cyrill Gorcunov <gorcunov@gmail.com>]

We already have error_report_once and warn_report_once,
thus lets add info_report_once to complement. Actually
I use this helper a lot so might be usefull for others.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 include/qemu/error-report.h |   13 +++++++++++++
 util/qemu-error.c           |   20 ++++++++++++++++++++
 2 files changed, 33 insertions(+)

Index: vanilla.git/include/qemu/error-report.h
===================================================================
--- vanilla.git.orig/include/qemu/error-report.h
+++ vanilla.git/include/qemu/error-report.h
@@ -47,6 +47,8 @@ bool error_report_once_cond(bool *printe
     GCC_FMT_ATTR(2, 3);
 bool warn_report_once_cond(bool *printed, const char *fmt, ...)
     GCC_FMT_ATTR(2, 3);
+bool info_report_once_cond(bool *printed, const char *fmt, ...)
+    GCC_FMT_ATTR(2, 3);
 
 void error_init(const char *argv0);
 
@@ -72,6 +74,17 @@ void error_init(const char *argv0);
                               fmt, ##__VA_ARGS__);      \
     })
 
+/*
+ * Similar to info_report(), except it prints the message just once.
+ * Return true when it prints, false otherwise.
+ */
+#define info_report_once(fmt, ...)                      \
+    ({                                                  \
+        static bool print_once_;                        \
+        info_report_once_cond(&print_once_,             \
+                              fmt, ##__VA_ARGS__);      \
+    })
+
 const char *error_get_progname(void);
 extern bool enable_timestamp_msg;
 
Index: vanilla.git/util/qemu-error.c
===================================================================
--- vanilla.git.orig/util/qemu-error.c
+++ vanilla.git/util/qemu-error.c
@@ -350,6 +350,26 @@ bool warn_report_once_cond(bool *printed
     return true;
 }
 
+/*
+ * Like info_report(), except print just once.
+ * If *printed is false, print the message, and flip *printed to true.
+ * Return whether the message was printed.
+ */
+bool info_report_once_cond(bool *printed, const char *fmt, ...)
+{
+    va_list ap;
+
+    assert(printed);
+    if (*printed) {
+        return false;
+    }
+    *printed = true;
+    va_start(ap, fmt);
+    vreport(REPORT_TYPE_INFO, fmt, ap);
+    va_end(ap);
+    return true;
+}
+
 static char *qemu_glog_domains;
 
 static void qemu_log_func(const gchar *log_domain,