[Qemu-devel] [PATCH V2 03/10] error: add function error_set_check()

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  This function will return instead of abort when *errp is not NULL.
Also macro error_setg_check is added.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 error.c              |   19 +++++++++++++++++++
 include/qapi/error.h |    5 +++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/error.c b/error.c
index 519f6b6..e4ec67c 100644
--- a/error.c
+++ b/error.c
@@ -43,6 +43,25 @@ void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
     *errp = err;
 }
 
+void error_set_check(Error **errp, ErrorClass err_class, const char *fmt, ...)
+{
+    Error *err;
+    va_list ap;
+
+    if ((errp == NULL) || (*errp != NULL)) {
+        return;
+    }
+
+    err = g_malloc0(sizeof(*err));
+
+    va_start(ap, fmt);
+    err->msg = g_strdup_vprintf(fmt, ap);
+    va_end(ap);
+    err->err_class = err_class;
+
+    *errp = err;
+}
+
 void error_set_errno(Error **errp, int os_errno, ErrorClass err_class,
                      const char *fmt, ...)
 {
diff --git a/include/qapi/error.h b/include/qapi/error.h
index 5cd2f0c..04b87a9 100644
--- a/include/qapi/error.h
+++ b/include/qapi/error.h
@@ -29,6 +29,9 @@ typedef struct Error Error;
  */
 void error_set(Error **err, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
 
+void error_set_check(Error **errp, ErrorClass err_class, const char *fmt, ...)
+GCC_FMT_ATTR(3, 4);
+
 /**
  * Set an indirect pointer to an error given a ErrorClass value and a
  * printf-style human message, followed by a strerror() string if
@@ -41,6 +44,8 @@ void error_set_errno(Error **err, int os_error, ErrorClass err_class, const char
  */
 #define error_setg(err, fmt, ...) \
     error_set(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
+#define error_setg_check(err, fmt, ...) \
+    error_set_check(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
 #define error_setg_errno(err, os_error, fmt, ...) \
     error_set_errno(err, os_error, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
 
-- 
1.7.1