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



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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 <ctype.h>(0P)