_TOUPPER(3POSIX)                            POSIX Programmer's Manual                           _TOUPPER(3POSIX)

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 letter 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 obsolescent _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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                      _TOUPPER(3POSIX)