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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 .