X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fstdio%2Fopen_wmemstream.c;h=a830b143ebe95cbf6dc4b038bc44b7357b824841;hb=fcaec912ed406659832f452e71a6c965308362dd;hp=0db77416cec819ce1cc7782bf68fd31c8955eb4a;hpb=c88f36f55623124d09f48631974ca38aaec00057;p=musl

diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
index 0db77416..a830b143 100644
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -30,8 +30,8 @@ static size_t wms_write(FILE *f, const unsigned char *buf, size_t len)
 	struct cookie *c = f->cookie;
 	size_t len2;
 	wchar_t *newbuf;
-	if (len >= c->space - c->pos) {
-		len2 = 2*c->space+1 | c->space+len+1;
+	if (len + c->pos >= c->space) {
+		len2 = 2*c->space+1 | c->pos+len+1;
 		if (len2 > SSIZE_MAX/4) return 0;
 		newbuf = realloc(c->buf, len2*4);
 		if (!newbuf) return 0;