2 @section @code{isdigit}
5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isdigit.html}
9 Portability problems fixed by Gnulib:
13 Portability problems not fixed by Gnulib:
17 Note: This function's behaviour depends on the locale, but does not support
18 the multibyte characters that occur in strings in locales with
19 @code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales).
20 There are four alternative APIs:
24 This function operates in a locale independent way and returns true only for
25 ASCII characters. It is provided by the Gnulib module @samp{c-ctype}.
28 This function operates in a locale dependent way, on wide characters. In
29 order to use it, you first have to convert from multibyte to wide characters,
30 using the @code{mbrtowc} function. It is provided by the Gnulib module
34 This function operates in a locale dependent way, on multibyte characters.
35 It is provided by the Gnulib module @samp{mbchar}.
38 This function operates in a locale independent way, on Unicode characters.
39 It is provided by the Gnulib module @samp{unictype/ctype-digit}.