3 size_t mbsnrtowcs(wchar_t *restrict wcs, const char **restrict src, size_t n, size_t wn, mbstate_t *restrict st)
6 wchar_t *ws, wbuf[256];
9 if (!wcs) ws = wbuf, wn = sizeof wbuf / sizeof *wbuf;
12 /* making sure output buffer size is at most n/4 will ensure
13 * that mbsrtowcs never reads more than n input bytes. thus
14 * we can use mbsrtowcs as long as it's practical.. */
16 while ( s && wn && ( (n2=n/4)>=wn || n2>32 ) ) {
19 l = mbsrtowcs(ws, &s, n2, st);
31 if (s) while (wn && n) {
32 l = mbrtowc(ws, s, n, st);
42 /* have to roll back partial character */
47 /* safe - this loop runs fewer than sizeof(wbuf)/8 times */