isxdigit(3p) - phpMan

ISXDIGIT(3P)               POSIX Programmer's Manual              ISXDIGIT(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
       isxdigit - test for a hexadecimal digit
SYNOPSIS
       #include <ctype.h>
       int isxdigit(int c);

DESCRIPTION
       The isxdigit() function shall test whether c is a  character  of  class
       xdigit 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 behav-
       ior is undefined.
RETURN VALUE
       The  isxdigit()  function  shall  return non-zero if c is a hexadecimal
       digit; 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  lan-
       guages,  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(), isupper(), the Base Definitions 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 Technology
       -- 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                         ISXDIGIT(3P)