musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/stdio/vswprintf.c b/src/stdio/vswprintf.c
index 7f98c5c9..fc223cf2 100644
--- a/src/stdio/vswprintf.c
+++ b/src/stdio/vswprintf.c

@@ -18,6 +18,7 @@ static size_t sw_write(FILE *f, const unsigned char *s, size_t l)

if (s!=f->wbase && sw_write(f, f->wbase, f->wpos-f->wbase)==-1)

return -1;

while (c->l && l && (i=mbtowc(c->ws, (void *)s, l))>=0) {

+ if (!i) i=1;

s+=i;

l-=i;

c->l--;