ctype.h

<ctype.h>(P)							 <ctype.h>(P)



NAME
       ctype.h - character types

SYNOPSIS
       #include <ctype.h>

DESCRIPTION
       Some of the functionality described on this reference page extends the
       ISO C standard. Applications shall define the appropriate feature test
       macro  (see the System Interfaces volume of IEEE Std 1003.1-2001, Sec-
       tion 2.2, The Compilation Environment) to  enable  the  visibility  of
       these symbols in this header.

       The  following  shall be declared as functions and may also be defined
       as macros. Function prototypes shall be provided.


	      int   isalnum(int);
	      int   isalpha(int);

	      int   isascii(int);

	      int   isblank(int);
	      int   iscntrl(int);
	      int   isdigit(int);
	      int   isgraph(int);
	      int   islower(int);
	      int   isprint(int);
	      int   ispunct(int);
	      int   isspace(int);
	      int   isupper(int);
	      int   isxdigit(int);

	      int   toascii(int);

	      int   tolower(int);
	      int   toupper(int);

       The following are defined as macros:


	      int   _toupper(int);
	      int   _tolower(int);


       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <locale.h> , the System	Interfaces  volume  of	IEEE Std 1003.1-2001,
       isalnum(),  isalpha(),  isascii(),  iscntrl(),  isdigit(),  isgraph(),
       islower(), isprint(),  ispunct(),  isspace(),  isupper(),  isxdigit(),
       mblen(),	 mbstowcs(),  mbtowc(),	 setlocale(),  toascii(),  tolower(),
       _tolower(), toupper(), _toupper(), wcstombs(), wctomb()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic	 form
       from  IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface  (POSIX),  The  Open	Group
       Base  Specifications Issue 6, Copyright (C) 2001-2003 by the Institute
       of Electrical and Electronics Engineers, Inc and The  Open  Group.  In
       the  event  of  any  discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard	 is  the  referee  document.  The  original  Standard  can be
       obtained online at http://www.opengroup.org/unix/online.html .



POSIX				     2003			 <ctype.h>(P)