0p:ctype.h

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      ctype.h - character types
      
      #include <ctype.h>

Contents 1 DESCRIPTION 2 APPLICATION USAGE 3 RATIONALE 4 FUTURE DIRECTIONS 5 RELATED 6 COPYRIGHT 7 CATEGORY

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 pro-
      vided.
 
             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.

RELATED

      <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,  Stan-
      dard   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 .

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

CATEGORY