c_isdigit          94 gnulib-tests/test-c-ctype.c           ASSERT (c_isdigit (c) == 1);
c_isdigit          97 gnulib-tests/test-c-ctype.c           ASSERT (c_isdigit (c) == 0);
c_isdigit         129 lib/c-ctype.h  extern bool c_isdigit (int c);