_toupper man page on Oracle

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_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 (consult 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() macro shall be equivalent to toupper() except  that  the
       application shall ensure that the argument c is a lowercase letter.

RETURN VALUE
       Upon  successful completion, _toupper() shall return the uppercase let‐
       ter 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
       islower(),    toupper(),	   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, 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			  _TOUPPER(3P)
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