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#include "stdio_impl.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);
}
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