From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 22 Mar 2023 16:56:46 +0000 (-0400)
Subject: fix swprintf handling of nul character in output
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=1d5750b95c06913a1f18a995481276d698d20fae;p=musl

fix swprintf handling of nul character in output

the buffer-flush function did not account for mbtowc returning 0
rather than 1 when converting the nul character. this prevented
advancing past it, instead repeatedly converting it into the output
wide character string until the max output length was exhausted.
---

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--;