Bruno Haible <[EMAIL PROTECTED]> wrote: > Jim Meyering wrote: >> To have any hope of sanity/reproducibility in different locales, >> this function must return the same result, regardless of the current >> locale settings. > > Yes. In the opposite case, if the function was to handle non-ASCII letters > like ASCII letters, it should also have a codepath for multibyte locales. > >> I suggest using this macro in place of ISDIGIT: >> >> #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9) > > This is equivalent to the c_isdigit macro from "c-ctype.h", assuming the > normal compiler optimizations. gcc yields identical code for ISDIGIT as for > c_isdigit.
Good to know. In that case, of course, it's better to use c_isdigit.
