[PATCH v5 4/8] util: refactor qemu_open_old to split off variadic args handling

["Daniel P. Berrangé" <berrange@redhat.com>]

This simple refactoring prepares for future patches. The variadic args
handling is split from the main bulk of the open logic. The duplicated
calls to open() are removed in favour of updating the "flags" variable
to have O_CLOEXEC.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 util/osdep.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/util/osdep.c b/util/osdep.c
index 7504c156e8..dd34b58bb7 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -22,6 +22,7 @@
  * THE SOFTWARE.
  */
 #include "qemu/osdep.h"
+#include "qapi/error.h"
 
 /* Needed early for CONFIG_BSD etc. */
 
@@ -296,10 +297,10 @@ static int qemu_open_cloexec(const char *name, int flags, mode_t mode)
 /*
  * Opens a file with FD_CLOEXEC set
  */
-int qemu_open_old(const char *name, int flags, ...)
+static int
+qemu_open_internal(const char *name, int flags, mode_t mode)
 {
     int ret;
-    int mode = 0;
 
 #ifndef _WIN32
     const char *fdset_id_str;
@@ -324,15 +325,25 @@ int qemu_open_old(const char *name, int flags, ...)
     }
 #endif
 
-    if (flags & O_CREAT) {
-        va_list ap;
+    ret = qemu_open_cloexec(name, flags, mode);
+
+    return ret;
+}
+
 
-        va_start(ap, flags);
+int qemu_open_old(const char *name, int flags, ...)
+{
+    va_list ap;
+    mode_t mode = 0;
+    int ret;
+
+    va_start(ap, flags);
+    if (flags & O_CREAT) {
         mode = va_arg(ap, int);
-        va_end(ap);
     }
+    va_end(ap);
 
-    ret = qemu_open_cloexec(name, flags, mode);
+    ret = qemu_open_internal(name, flags, mode);
 
 #ifdef O_DIRECT
     if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
-- 
2.26.2