[Qemu-devel] [PATCH 08/13] qerror: add qerror_from_args() to create qerror objects

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

There is no convenient way to create a QError object without reporting
it immediately.  This patch adds the qerror_from_args() function to make
it easy to create an error in qerror_report() style but without
reporting it.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 qerror.c |   21 +++++++++++++++++++++
 qerror.h |    6 ++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/qerror.c b/qerror.c
index d7fcd93..64b41ca 100644
--- a/qerror.c
+++ b/qerror.c
@@ -443,6 +443,27 @@ void qerror_print(QError *qerror)
     QDECREF(qstring);
 }
 
+/**
+ * qerror_from_args_internal(): Create a new QError
+ *
+ * This is a convenience wrapper of the qerror_from_info() function for when a
+ * va_list is not available.
+ *
+ * Return a strong reference.
+ */
+QError *qerror_from_args_internal(const char *file, int linenr,
+                                  const char *func, const char *fmt, ...)
+{
+    va_list va;
+    QError *qerror;
+
+    va_start(va, fmt);
+    qerror = qerror_from_info(file, linenr, func, fmt, &va);
+    va_end(va);
+
+    return qerror;
+}
+
 void qerror_report_internal(const char *file, int linenr, const char *func,
                             const char *fmt, ...)
 {
diff --git a/qerror.h b/qerror.h
index 16c830d..173c84f 100644
--- a/qerror.h
+++ b/qerror.h
@@ -35,6 +35,12 @@ typedef struct QError {
 QError *qerror_new(void);
 QError *qerror_from_info(const char *file, int linenr, const char *func,
                          const char *fmt, va_list *va) GCC_FMT_ATTR(4, 0);
+QError *qerror_from_args_internal(const char *file, int linenr,
+                                  const char *func, const char *fmt,
+                                  ...) GCC_FMT_ATTR(4, 0);
+#define qerror_from_args(fmt, ...) \
+    qerror_from_args_internal(__FILE__, __LINE__, __func__, \
+                              fmt, ## __VA_ARGS__)
 QString *qerror_human(const QError *qerror);
 void qerror_print(QError *qerror);
 void qerror_report_internal(const char *file, int linenr, const char *func,
-- 
1.7.5.3