fix swprintf handling of nul character in output

[musl] / src / stdio / vswprintf.c

diff --git a/src/stdio/vswprintf.c b/src/stdio/vswprintf.c
index 38efed6..fc223cf 100644 (file)
--- a/src/stdio/vswprintf.c
+++ b/src/stdio/vswprintf.c
@@ -2,6 +2,7 @@
 #include <limits.h>
 #include <errno.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include <wchar.h>
 
 struct cookie {
@@ -17,6 +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--;