[Qemu-devel] [PATCH 2/2] vl.c: reduce exit on error code duplication

[Igor Mammedov <imammedo@redhat.com>]

use exit_if_error() helper instead of a bunch of
    if (local_err) {
        error_report(foo);
        error_free(local_err);
        exit(1);
    }
code blocks

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 vl.c | 58 ++++++++++++++++++++++++++++++----------------------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/vl.c b/vl.c
index f563da1..151ee2d 100644
--- a/vl.c
+++ b/vl.c
@@ -582,6 +582,30 @@ static void res_free(void)
     }
 }
 
+static void GCC_FMT_ATTR(2, 3) exit_if_error(Error *err, const char *fmt, ...)
+{
+    va_list ap;
+
+    if (!err) {
+        return;
+    }
+
+    if (fmt) {
+        char *optional_msg = NULL;
+
+        va_start(ap, fmt);
+        optional_msg = g_strdup_vprintf(fmt, ap);
+        va_end(ap);
+        error_report("%s: %s", optional_msg, error_get_pretty(err));
+        g_free(optional_msg);
+    } else {
+        error_report("%s", error_get_pretty(err));
+    }
+
+    error_free(err);
+    exit(EXIT_FAILURE);
+}
+
 static int default_driver_check(QemuOpts *opts, void *opaque)
 {
     const char *driver = qemu_opt_get(opts, "driver");
@@ -2380,11 +2404,7 @@ static int chardev_init_func(QemuOpts *opts, void *opaque)
     Error *local_err = NULL;
 
     qemu_chr_new_from_opts(opts, NULL, &local_err);
-    if (local_err) {
-        error_report("%s", error_get_pretty(local_err));
-        error_free(local_err);
-        return -1;
-    }
+    exit_if_error(local_err, NULL);
     return 0;
 }
 
@@ -2790,12 +2810,7 @@ static int machine_set_property(const char *name, const char *value,
     string_input_visitor_cleanup(siv);
     g_free(qom_name);
 
-    if (local_err) {
-        qerror_report_err(local_err);
-        error_free(local_err);
-        return -1;
-    }
-
+    exit_if_error(local_err, NULL);
     return 0;
 }
 
@@ -4190,11 +4205,7 @@ int main(int argc, char **argv, char **envp)
 
     if (qtest_chrdev) {
         qtest_init(qtest_chrdev, qtest_log, &local_err);
-        if (local_err) {
-            error_report("%s", error_get_pretty(local_err));
-            error_free(local_err);
-            exit(1);
-        }
+        exit_if_error(local_err, NULL);
     }
 
     machine_opts = qemu_get_machine_opts();
@@ -4434,12 +4445,8 @@ int main(int argc, char **argv, char **envp)
     if (vnc_display) {
         vnc_display_init(ds);
         vnc_display_open(ds, vnc_display, &local_err);
-        if (local_err != NULL) {
-            error_report("Failed to start VNC server on `%s': %s",
-                         vnc_display, error_get_pretty(local_err));
-            error_free(local_err);
-            exit(1);
-        }
+        exit_if_error(local_err, "Failed to start VNC server on '%s'",
+                      vnc_display);
 
         if (show_vnc_port) {
             printf("VNC server running on `%s'\n", vnc_display_local_addr(ds));
@@ -4487,12 +4494,7 @@ int main(int argc, char **argv, char **envp)
 
     if (incoming) {
         qemu_start_incoming_migration(incoming, &local_err);
-        if (local_err) {
-            error_report("-incoming %s: %s", incoming,
-                         error_get_pretty(local_err));
-            error_free(local_err);
-            exit(1);
-        }
+        exit_if_error(local_err, "-incoming %s", incoming);
     } else if (autostart) {
         vm_start();
     }
-- 
1.9.3 (Apple Git-50)