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,  Section 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 Technology -- 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 .