792     size_t insize, nchars, nconv;  in mbsconv()  local
800       insize = nchars = nconv = 0;  in mbsconv()
803         nconv = mbrlen(p, MB_CUR_MAX, &mbs);  in mbsconv()
804         if (nconv == (size_t)0 || nconv == (size_t)-1 || nconv == (size_t)-2) break;  in mbsconv()
805         p += nconv;  in mbsconv()
807         insize += nconv;  in mbsconv()
809       if (nconv == (size_t)-1 || nconv == (size_t)-2) return (nullptr);  in mbsconv()
822     nconv = 0;  in mbsconv()
824       nconv = mbrtowc(wcp, p, insize, &mbs);  in mbsconv()
825       if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) break;  in mbsconv()
827       p += nconv;  in mbsconv()
828       insize -= nconv;  in mbsconv()
830     if (nconv == (size_t)-1 || nconv == (size_t)-2) {  in mbsconv()