btowc
wint_t btowc(int);
*(cp = buf) = (wchar_t)btowc(GETARG(int));
y->bytetab[i] = (btowc(i) != WEOF) ? i : 0;
eols = zero_ended ? btowc('\0') : btowc('\n');
eols = zero_ended ? btowc('\0') : btowc('\n');
sort_opts_vals.field_sep = btowc(optarg[0]);