Gnulib module: ctype
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
Note: This function’s behaviour depends on the locale, but requires special
handling for the multibyte characters that occur in strings in locales with
MB_CUR_MAX > 1 (this includes all the common UTF-8 locales).
There are two alternative APIs:
This function operates in a locale independent way and returns true only for ASCII characters. It is provided by the Gnulib module ‘c-ctype’.
This function operates in a locale dependent way, on multibyte characters. It is provided by the Gnulib module ‘mbchar’.