c_isxdigit        151 gnulib-tests/test-c-ctype.c           ASSERT (c_isxdigit (c) == 1);
c_isxdigit        154 gnulib-tests/test-c-ctype.c           ASSERT (c_isxdigit (c) == 0);
c_isxdigit        136 lib/c-ctype.h  extern bool c_isxdigit (int c);