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_TOUPPER(3P) POSIX Programmer's Manual _TOUPPER(3P)
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.
_toupper — transliterate lowercase characters to uppercase
#include <ctype.h>
int _toupper(int c);
The _toupper() macro shall be equivalent to toupper() except that the
application shall ensure that the argument c is a lowercase letter.
Upon successful completion, _toupper() shall return the uppercase
letter corresponding to the argument passed.
No errors are defined.
The following sections are informative.
None.
Applications should use the toupper() function instead of the
obsolescent _toupper() function.
None.
The _toupper() function may be removed in a future version.
islower(3p), toupper(3p)
The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
ctype.h(0p)
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(3P)
Pages that refer to this page: ctype.h(0p)