X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ffailtest%2Ftest%2Frun-malloc.c;h=3912bfd060794300c8456a5ca7a3897637ddee25;hp=5849ef65a0277270779829c4817c905f6fe2dbb0;hb=adc9909e26f96eec2c6846aa4085551af59979cf;hpb=f0002cb9e4f6f403a25ad50252c06694439900f0

diff --git a/ccan/failtest/test/run-malloc.c b/ccan/failtest/test/run-malloc.c
index 5849ef65..3912bfd0 100644
--- a/ccan/failtest/test/run-malloc.c
+++ b/ccan/failtest/test/run-malloc.c
@@ -48,8 +48,13 @@ static char *output = NULL;
 
 static int saved_vprintf(const char *fmt, va_list ap)
 {
-	int ret = vsnprintf(NULL, 0, fmt, ap);
+	int ret;
 	int len = 0;
+	va_list ap2;
+
+	va_copy(ap2, ap);
+	ret = vsnprintf(NULL, 0, fmt, ap2);
+	va_end(ap2);
 
 	if (output)
 		len = strlen(output);