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ctype.h(0P)		   POSIX Programmer's Manual		   ctype.h(0P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       ctype.h — character types

       #include <ctype.h>

       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 POSIX.1‐2008,	 Section  2.2,
       The  Compilation Environment) to enable the visibility of these symbols
       in this header.

       The <ctype.h> header shall define the locale_t  type  as	 described  in
       <locale.h>, representing a locale object.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided for use with ISO C	 stan‐
       dard compilers.

	   int	 isalnum(int);
	   int	 isalnum_l(int, locale_t);
	   int	 isalpha(int);
	   int	 isalpha_l(int, locale_t);
	   int	 isascii(int);
	   int	 isblank(int);
	   int	 isblank_l(int, locale_t);
	   int	 iscntrl(int);
	   int	 iscntrl_l(int, locale_t);
	   int	 isdigit(int);
	   int	 isdigit_l(int, locale_t);
	   int	 isgraph(int);
	   int	 isgraph_l(int, locale_t);
	   int	 islower(int);
	   int	 islower_l(int, locale_t);
	   int	 isprint(int);
	   int	 isprint_l(int, locale_t);
	   int	 ispunct(int);
	   int	 ispunct_l(int, locale_t);
	   int	 isspace(int);
	   int	 isspace_l(int, locale_t);
	   int	 isupper(int);
	   int	 isupper_l(int, locale_t);
	   int	 isxdigit(int);
	   int	 isxdigit_l(int, locale_t);
	   int	 toascii(int);
	   int	 tolower(int);
	   int	 tolower_l(int, locale_t);
	   int	 toupper(int);
	   int	 toupper_l(int, locale_t);

       The <ctype.h> header shall define the following as macros:

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

       The following sections are informative.





       The System Interfaces volume of POSIX.1‐2008, Section 2.2, The Compila‐
       tion Environment, isalnum(),  isalpha(),	 isascii(),  isblank(),	 iscn‐
       trl(),  isdigit(),  isgraph(),  islower(),  isprint(),  ispunct(), iss‐
       pace(), isupper(), isxdigit(), mblen(),	mbstowcs(),  mbtowc(),	setlo‐
       cale(),	 toascii(),   tolower(),  _tolower(),  toupper(),  _toupper(),
       wcstombs(), wctomb()

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   ctype.h(0P)

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