TOUPPER(3P)                                         POSIX Programmer's Manual                                        TOUPPER(3P)



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

NAME
       toupper - transliterate lowercase characters to uppercase

SYNOPSIS
       #include <ctype.h>

       int toupper(int c);


DESCRIPTION
       The  toupper()  function has as a domain a type int, the value of which is representable as an unsigned char or the value
       of EOF. If the argument has any other value, the behavior is undefined. If the argument of toupper() represents a  lower-
       case  letter, and there exists a corresponding uppercase letter  (as defined by character type information in the program
       locale category LC_CTYPE ),  the result shall be the corresponding uppercase letter. All other arguments  in  the  domain
       are returned unchanged.

RETURN VALUE
       Upon successful completion, toupper() shall return the uppercase letter corresponding to the argument passed.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>

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                                                   TOUPPER(3P)