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-rw-r--r--compat_vasprintf.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/compat_vasprintf.c b/compat_vasprintf.c
index 10113aaa..bfeb96dd 100644
--- a/compat_vasprintf.c
+++ b/compat_vasprintf.c
@@ -37,10 +37,14 @@ int
vasprintf(char **ret, const char *format, va_list ap)
{
char buf[2];
+ va_list ap2;
int sz;
- if ((sz = vsnprintf(buf, sizeof(buf), format, ap)) != -1 &&
- (*ret = malloc(sz + 1)) != NULL) {
+ va_copy(ap2, ap);
+ sz = vsnprintf(buf, sizeof(buf), format, ap2);
+ va_end(ap2);
+
+ if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) {
if (vsnprintf(*ret, sz + 1, format, ap) == sz)
return(sz);
free(*ret);