centos man page for isupper

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

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

NAME
       isupper - test for an uppercase letter

SYNOPSIS
       #include <ctype.h>

       int isupper(int c);

DESCRIPTION
       The isupper() function shall test whether c is a character of class upper in the program's current locale; see the Base Definitions  volume
       of IEEE Std 1003.1-2001, Chapter 7, Locale.

       The  c argument is an int, the value of which the application shall ensure is a character representable as an unsigned char or equal to the
       value of the macro EOF. If the argument has any other value, the behavior is undefined.

RETURN VALUE
       The isupper() function shall return non-zero if c is an uppercase letter; otherwise, it shall return 0.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       To ensure applications portability, especially across natural languages, only this function and those listed in the SEE ALSO section should
       be used for character classification.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isalnum(),  isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isxdigit(), setlocale(), the Base Defi-
       nitions 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 Technol-
       ogy -- 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							       ISUPPER(3P)