767     size_t insize, nchars, nconv;  in mbsconv()  local
775       insize = nchars = nconv = 0;  in mbsconv()
778         nconv = mbrlen(p, MB_CUR_MAX, &mbs);  in mbsconv()
779         if (nconv == (size_t)0 || nconv == (size_t)-1 || nconv == (size_t)-2) break;  in mbsconv()
780         p += nconv;  in mbsconv()
782         insize += nconv;  in mbsconv()
784       if (nconv == (size_t)-1 || nconv == (size_t)-2) return (nullptr);  in mbsconv()
797     nconv = 0;  in mbsconv()
799       nconv = mbrtowc(wcp, p, insize, &mbs);  in mbsconv()
800       if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) break;  in mbsconv()
802       p += nconv;  in mbsconv()
803       insize -= nconv;  in mbsconv()
805     if (nconv == (size_t)-1 || nconv == (size_t)-2) {  in mbsconv()