2 * This code was written by Rich Felker in 2010; no copyright is claimed.
3 * This code is in the public domain. Attribution is appreciated but
9 size_t mbsnrtowcs(wchar_t *restrict wcs, const char **restrict src, size_t n, size_t wn, mbstate_t *restrict st)
12 wchar_t *ws, wbuf[256];
15 if (!wcs) ws = wbuf, wn = sizeof wbuf / sizeof *wbuf;
18 /* making sure output buffer size is at most n/4 will ensure
19 * that mbsrtowcs never reads more than n input bytes. thus
20 * we can use mbsrtowcs as long as it's practical.. */
22 while ( s && wn && ( (n2=n/4)>=wn || n2>32 ) ) {
25 l = mbsrtowcs(ws, &s, n2, st);
37 if (s) while (wn && n) {
38 l = mbrtowc(ws, s, n, st);
48 /* have to roll back partial character */
53 /* safe - this loop runs fewer than sizeof(wbuf)/8 times */