kc3-lang/gnulib/doc/posix-functions/isupper.texi

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  Date : 2019-09-22T23:23:20
  

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• doc/posix-functions/isupper.texi

• @node isupper
  @section @code{isupper}
  @findex isupper
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/isupper.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_isupper
  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 iswupper
  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_isupper
  This function operates in a locale dependent way, on multibyte characters.
  It is provided by the Gnulib module @samp{mbchar}.
  
  @item uc_is_upper
  This function operates in a locale independent way, on Unicode characters.
  It is provided by the Gnulib module @samp{unictype/ctype-upper}.
  @end table
  

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