memstreams: fix incorrect handling of file pos > current size

[musl] / src / stdio / open_memstream.c

diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c
index 7fc1620..687e818 100644 (file)
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -32,8 +32,8 @@ static size_t ms_write(FILE *f, const unsigned char *buf, size_t len)
                f->wpos = f->wbase;
                if (ms_write(f, f->wbase, len2) < len2) return 0;
        }
-       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;
                newbuf = realloc(c->buf, len2);
                if (!newbuf) return 0;
                *c->bufp = c->buf = newbuf;