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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
       Applications should use the toupper() function instead of the  obsoles-
       cent _toupper() function.
RATIONALE
       None.
FUTURE DIRECTIONS
       The _toupper() function may be removed in a future version.
SEE ALSO
       islower(), toupper()
       The  Base  Definitions  volume  of  POSIX.1-2008,  Chapter  7,  Locale,
       <ctype.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         _TOUPPER(3P)