| @node isdigit |
| @section @code{isdigit} |
| @findex isdigit |
| |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/isdigit.html} |
| |
| Gnulib module: ctype |
| |
| Portability problems fixed by Gnulib: |
| @itemize |
| @item |
| This function cannot be called from plain inline or extern inline functions |
| on some platforms: |
| OS X 10.8. |
| @end itemize |
| |
| Portability problems not fixed by Gnulib: |
| @itemize |
| @end itemize |
| |
| Note: This function's behaviour depends on the locale, but does not support |
| the multibyte characters that occur in strings in locales with |
| @code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales). |
| There are four alternative APIs: |
| |
| @table @code |
| @item c_isdigit |
| This function operates in a locale independent way and returns true only for |
| ASCII characters. It is provided by the Gnulib module @samp{c-ctype}. |
| |
| @item iswdigit |
| This function operates in a locale dependent way, on wide characters. In |
| order to use it, you first have to convert from multibyte to wide characters, |
| using the @code{mbrtowc} function. It is provided by the Gnulib module |
| @samp{wctype}. |
| |
| @item mb_isdigit |
| This function operates in a locale dependent way, on multibyte characters. |
| It is provided by the Gnulib module @samp{mbchar}. |
| |
| @item uc_is_digit |
| This function operates in a locale independent way, on Unicode characters. |
| It is provided by the Gnulib module @samp{unictype/ctype-digit}. |
| @end table |