isupper_l(3p) — Linux manual page


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

PROLOG         top

       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         top

       isupper, isupper_l — test for an uppercase letter

SYNOPSIS         top

       #include <ctype.h>

       int isupper(int c);
       int isupper_l(int c, locale_t locale);

DESCRIPTION         top

       For isupper(): The functionality described on this reference page is
       aligned with the ISO C standard. Any conflict between the
       requirements described here and the ISO C standard is unintentional.
       This volume of POSIX.1‐2008 defers to the ISO C standard.

       The isupper() and isupper_l() functions shall test whether c is a
       character of class upper in the current locale, or in the locale
       represented by locale, respectively; see the Base Definitions volume
       of POSIX.1‐2008, 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.

       The behavior is undefined if the locale argument to isupper_l() is
       the special locale object LC_GLOBAL_LOCALE or is not a valid locale
       object handle.

RETURN VALUE         top

       The isupper() and isupper_l() functions shall return non-zero if c is
       an uppercase letter; otherwise, they shall return 0.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



       To ensure applications portability, especially across natural
       languages, only these functions and the functions in the reference
       pages listed in the SEE ALSO section should be used for character

RATIONALE         top




SEE ALSO         top

       isalnum(3p), isalpha(3p), isblank(3p), iscntrl(3p), isdigit(3p),
       isgraph(3p), islower(3p), isprint(3p), ispunct(3p), isspace(3p),
       isxdigit(3p), setlocale(3p), uselocale(3p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
       ctype.h(0p), locale.h(0p)

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                         ISUPPER(3P)