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--- lib/vasnprintf.h.orig 2016-07-13 08:19:27 UTC
+++ lib/vasnprintf.h
@@ -0,0 +1,23 @@
+#pragma once
+#include <stdarg.h>
+#include <stdio.h>
+
+static inline char *
+vasnprintf(char *resultbuf, size_t *lengthp, const char *format, va_list args)
+{
+ char *alloc;
+ int len;
+
+ len = vasprintf(&alloc, format, args);
+ if (len < 0)
+ return (NULL);
+
+ *lengthp = len;
+
+ if (resultbuf != NULL && (size_t)len < *lengthp) {
+ memcpy(resultbuf, alloc, len + 1);
+ free(alloc);
+ return (resultbuf);
+ }
+ return (alloc);
+}
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