only use memcpy realloc to shrink if an exact-sized free chunk exists

[oweals/musl.git] / src / multibyte / mbrlen.c

#include <wchar.h>

size_t mbrlen(const char *restrict s, size_t n, mbstate_t *restrict st)
{
        static unsigned internal;
        return mbrtowc(0, s, n, st ? st : (mbstate_t *)&internal);
}