[PATCH 03/21] tests: qemuxml2argv: add va_arg enum handling

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This establishes a pattern that will allow us to make test macros
more general purpose, by taking optional arguments. The general
format will be:

DO_TEST_FULL(...
             ARG_FOO, <value1>,
             ARG_BAR, <value2>)

ARG_X are just enum values that we look for in the va_args and know
how to interpret.

Implement this for the existing implicit qemuCaps va_args

Signed-off-by: Cole Robinson <crobinso@xxxxxxxxxx>
---
 tests/qemuxml2argvtest.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 3b90cd1873..0dba908c70 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -624,14 +624,35 @@ testCompareXMLToArgv(const void *data)
     return ret;
 }
 
+typedef enum {
+    ARG_QEMU_CAPS = 1,
+
+    ARG_END = QEMU_CAPS_LAST,
+} testInfoArgNames;
+
 static int
 testInfoSetArgs(struct testInfo *info, ...)
 {
     va_list argptr;
-    int ret = 0;
+    testInfoArgNames argname;
+    int ret = -1;
 
     va_start(argptr, info);
-    virQEMUCapsSetVList(info->qemuCaps, argptr);
+    while ((argname = va_arg(argptr, int)) < ARG_END) {
+        switch (argname) {
+        case ARG_QEMU_CAPS:
+            virQEMUCapsSetVList(info->qemuCaps, argptr);
+            break;
+
+        case ARG_END:
+        default:
+            fprintf(stderr, "Unexpected test info argument");
+            goto cleanup;
+        }
+    }
+
+    ret = 0;
+ cleanup:
     va_end(argptr);
     return ret;
 }
@@ -821,7 +842,8 @@ mymain(void)
         }; \
         if (testInitQEMUCaps(&info, gic) < 0) \
             return EXIT_FAILURE; \
-        if (testInfoSetArgs(&info, __VA_ARGS__, QEMU_CAPS_LAST) < 0) \
+        if (testInfoSetArgs(&info, ARG_QEMU_CAPS, \
+                            __VA_ARGS__, QEMU_CAPS_LAST, ARG_END) < 0) \
             return EXIT_FAILURE; \
         if (virTestRun("QEMU XML-2-ARGV " name, \
                        testCompareXMLToArgv, &info) < 0) \
-- 
2.20.1

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