don't write openpty results until success is determined

[musl] / src / multibyte / mbrtowc.c

diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c
index 35e834e..e7b3654 100644 (file)
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -14,6 +14,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate
        unsigned c;
        const unsigned char *s = (const void *)src;
        const unsigned N = n;
+       wchar_t dummy;
 
        if (!st) st = (void *)&internal_state;
        c = *(unsigned *)st;
@@ -21,7 +22,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate
        if (!s) {
                if (c) goto ilseq;
                return 0;
-       } else if (!wc) wc = (void *)&wc;
+       } else if (!wc) wc = &dummy;
 
        if (!n) return -2;
        if (!c) {