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view doc/posix-functions/isdigit.texi @ 40139:3bacbf659cc9
ttyname_r: Work around bug on Android 4.3.
* m4/ttyname_r.m4 (gl_FUNC_TTYNAME_R): Test whether ttyname_r is a stub.
* lib/ttyname_r.c (ttyname_r): Implement for Android.
* doc/posix-functions/ttyname_r.texi: Mention the Android bug.
* doc/posix-functions/ttyname.texi: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 26 Jan 2019 11:56:31 +0100 |
parents | 0e5e385efec8 |
children |
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@node isdigit @section @code{isdigit} @findex isdigit POSIX specification:@* @url{http://www.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