mbrtowc: Fix wrong return value when n > UINT_MAX

mbrtowc truncates n to unsigned int when storing its copy.
If n > UINT_MAX and the locale is not POSIX, the function will
return a wrong value greater than UINT_MAX on the success path.

diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c
index c94819e..7824997 100644 (file)
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -8,7 +8,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate
        static unsigned internal_state;
        unsigned c;
        const unsigned char *s = (const void *)src;
-       const unsigned N = n;
+       const size_t N = n;
        wchar_t dummy;
 
        if (!st) st = (void *)&internal_state;