fix failure to distinguish input/match failure in wide %[ scanf

[musl] / src / stdio / vswscanf.c

diff --git a/src/stdio/vswscanf.c b/src/stdio/vswscanf.c
index 4396d7d..4c39f80 100644 (file)
--- a/src/stdio/vswscanf.c
+++ b/src/stdio/vswscanf.c
@@ -17,7 +17,7 @@ static size_t wstring_read(FILE *f, unsigned char *buf, size_t len)
        f->rend = f->buf + k;
        f->cookie = (void *)src;
 
-       if (!len) return 0;
+       if (!len || !k) return 0;
 
        *buf = *f->rpos++;
        return 1;