From 9255dad97e7bfd4165d1aa0f93f2aae321a7a4d8 Mon Sep 17 00:00:00 2001
From: Bartosz Brachaczek <b.brachaczek@gmail.com>
Date: Sun, 9 Jul 2017 23:00:18 +0200
Subject: handle whitespace before %% in scanf

this is mandated by C and POSIX standards and is in accordance with
glibc behavior.
---
 src/stdio/vfwscanf.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src/stdio/vfwscanf.c')

diff --git a/src/stdio/vfwscanf.c b/src/stdio/vfwscanf.c
index 1ebc5cef..a7cd0923 100644
--- a/src/stdio/vfwscanf.c
+++ b/src/stdio/vfwscanf.c
@@ -117,8 +117,12 @@ int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
 			continue;
 		}
 		if (*p != '%' || p[1] == '%') {
-			p += *p=='%';
-			c = getwc(f);
+			if (*p == '%') {
+				p++;
+				while (iswspace((c=getwc(f)))) pos++;
+			} else {
+				c = getwc(f);
+			}
 			if (c!=*p) {
 				ungetwc(c, f);
 				if (c<0) goto input_fail;
-- 
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