memstreams: fix incorrect handling of file pos > current size

[musl] / src / stdio / open_wmemstream.c

diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c
index 0db7741..a830b14 100644 (file)
--- 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;