kc3-lang/gnulib/doc/c-ctype.texi

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  Date : 2008-01-11T03:42:54
  

  Add documentation for the c-* modules.
  

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• doc/c-ctype.texi

• @c Documentation of gnulib module 'c-ctype'.
  
  @c Copyright (C) 2008 Free Software Foundation, Inc.
  
  @c Permission is granted to copy, distribute and/or modify this document
  @c under the terms of the GNU Free Documentation License, Version 1.2 or
  @c any later version published by the Free Software Foundation; with no
  @c Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
  @c Texts.  A copy of the license is included in the ``GNU Free
  @c Documentation License'' file as part of this distribution.
  
  The @code{c-ctype} module contains functions operating on single-byte
  characters, like the functions in @code{<ctype.h>}, that operate as if the
  locale encoding was ASCII.  (The "C" locale on many systems has the locale
  encoding "ASCII".)
  
  The functions are:
  @smallexample
  extern bool c_isascii (int c);
  
  extern bool c_isalnum (int c);
  extern bool c_isalpha (int c);
  extern bool c_isblank (int c);
  extern bool c_iscntrl (int c);
  extern bool c_isdigit (int c);
  extern bool c_islower (int c);
  extern bool c_isgraph (int c);
  extern bool c_isprint (int c);
  extern bool c_ispunct (int c);
  extern bool c_isspace (int c);
  extern bool c_isupper (int c);
  extern bool c_isxdigit (int c);
  
  extern int c_tolower (int c);
  extern int c_toupper (int c);
  @end smallexample
  
  These functions assign properties only to ASCII characters.
  
  The @var{c} argument can be a @code{char} or @code{unsigned char} value,
  whereas the corresponding functions in @code{<ctype.h>} take an argument
  that is actually an @code{unsigned char} value.
  
  The @code{c_is*} functions return @samp{bool}, where the corresponding
  functions in @code{<ctype.h>} return @samp{int} for historical reasons.
  
  Note: The @code{<ctype.h>} functions support only unibyte locales.
  

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