From afae851319c543118f08b49b1fa804ef31e34267 Mon Sep 17 00:00:00 2001
From: Curtis McEnroe <june@causal.agency>
Date: Mon, 20 Aug 2018 17:28:42 -0400
Subject: [PATCH] Set errno in vaswprintf in case vswprintf does not

As is the case on GNU.
---
 pls.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pls.c b/pls.c
index 01df654..d768b8f 100644
--- a/pls.c
+++ b/pls.c
@@ -75,6 +75,7 @@ int vaswprintf(wchar_t **ret, const wchar_t *format, va_list ap) {
 
 		va_list _ap;
 		va_copy(_ap, ap);
+		errno = EOVERFLOW; // vswprintf may not set errno.
 		int len = vswprintf(*ret, 1 + cap, format, _ap);
 		va_end(_ap);