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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, isxdigit_l -- test for a hexadecimal digit
SYNOPSIS
       #include <ctype.h>
       int isxdigit(int c);
       int isxdigit_l(int c, locale_t locale);
DESCRIPTION
       For isxdigit(): 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  isxdigit()  and  isxdigit_l()  functions shall test whether c is a
       character of class xdigit in the current locale, or in the locale  rep-
       resented  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 behav-
       ior is undefined.
       The behavior is undefined if the locale argument to isxdigit_l() is the
       special locale object LC_GLOBAL_LOCALE or is not a valid locale  object
       handle.
RETURN VALUE
       The isxdigit() and isxdigit_l() functions shall return non-zero if c is
       a hexadecimal digit; otherwise, they 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  these functions and the functions in the reference pages
       listed in the SEE ALSO section should be used for character classifica-
       tion.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       isalnum(),   isalpha(),  isblank(),  iscntrl(),  isdigit(),  isgraph(),
       islower(), isprint(), ispunct(), isspace(), isupper()
       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 Electri-
       cal  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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         ISXDIGIT(3P)