iscntrl 924 maint/gnulib/lib/dfa.c {"cntrl", iscntrl, false}, iscntrl 179 maint/gnulib/lib/mbswidth.c if (!iscntrl (c)) iscntrl 3502 maint/gnulib/lib/regcomp.c BUILD_CHARCLASS_LOOP (iscntrl); iscntrl 42 maint/gnulib/tests/test-c-ctype.c ASSERT (c_iscntrl (c) == (iscntrl (c) != 0));