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-rw-r--r--src/stdio/open_wmemstream.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
index 5402ca1a..3bc0f254 100644
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -39,13 +39,13 @@ 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) {
+ if (len >= c->space - c->pos) {
len2 = 2*c->space+1 | c->space+len+1;
if (len2 > SSIZE_MAX/4) return 0;
newbuf = realloc(c->buf, len2*4);
if (!newbuf) return 0;
*c->bufp = c->buf = newbuf;
- memset(c->buf + c->space, 0, len2 - c->space);
+ memset(c->buf + c->space, 0, 4*(len2 - c->space));
c->space = len2;
}