source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/stdio/vswscanf.c@ 337

#include "stdio_impl.h"
#include "libc.h"
#include <wchar.h>

static size_t wstring_read(FILE *f, unsigned char *buf, size_t len)
{
        const wchar_t *src = f->cookie;
        size_t k;

        if (!src) return 0;

        k = wcsrtombs((void *)f->buf, &src, f->buf_size, 0);
        if (k==(size_t)-1) {
                f->rpos = f->rend = 0;
                return 0;
        }

        f->rpos = f->buf;
        f->rend = f->buf + k;
        f->cookie = (void *)src;

        if (!len || !k) return 0;

        *buf = *f->rpos++;
        return 1;
}

int vswscanf(const wchar_t *restrict s, const wchar_t *restrict fmt, va_list ap)
{
        unsigned char buf[256];
        FILE f = {
                .buf = buf, .buf_size = sizeof buf,
                .cookie = (void *)s,
                .read = wstring_read, .lock = -1
        };
        return vfwscanf(&f, fmt, ap);
}

weak_alias(vswscanf,__isoc99_vswscanf);