1ISWALNUM(3P)               POSIX Programmer's Manual              ISWALNUM(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       iswalnum, iswalnum_l — test for an alphanumeric wide-character code
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SYNOPSIS

15       #include <wctype.h>
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17       int iswalnum(wint_t wc);
18       int iswalnum_l(wint_t wc, locale_t locale);
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DESCRIPTION

21       For iswalnum(): The functionality described on this reference  page  is
22       aligned  with the ISO C standard. Any conflict between the requirements
23       described here and the ISO C standard is unintentional. This volume  of
24       POSIX.1‐2017 defers to the ISO C standard.
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26       The  iswalnum()  and  iswalnum_l() functions shall test whether wc is a
27       wide-character code representing a character of class alpha or digit in
28       the  current  locale,  or  in the locale represented by locale, respec‐
29       tively; see the Base Definitions volume  of  POSIX.1‐2017,  Chapter  7,
30       Locale.
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32       The  wc  argument is a wint_t, the value of which the application shall
33       ensure is a wide-character code corresponding to a valid  character  in
34       the  locale  used  by  the function, or equal to the value of the macro
35       WEOF. If the argument has any other value, the behavior is undefined.
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37       The behavior is undefined if the locale argument to iswalnum_l() is the
38       special  locale object LC_GLOBAL_LOCALE or is not a valid locale object
39       handle.
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RETURN VALUE

42       The iswalnum() and iswalnum_l() functions shall return non-zero  if  wc
43       is an alphanumeric wide-character code; otherwise, they shall return 0.
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ERRORS

46       No errors are defined.
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48       The following sections are informative.
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EXAMPLES

51       None.
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APPLICATION USAGE

54       To  ensure  applications  portability,  especially  across natural lan‐
55       guages, only these functions and the functions in the  reference  pages
56       listed in the SEE ALSO section should be used for character classifica‐
57       tion.
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RATIONALE

60       None.
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FUTURE DIRECTIONS

63       None.
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SEE ALSO

66       iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(),
67       iswprint(),  iswpunct(),  iswspace(),  iswupper(),  iswxdigit(), setlo‐
68       cale(), uselocale()
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70       The  Base  Definitions  volume  of  POSIX.1‐2017,  Chapter  7,  Locale,
71       <locale.h>, <stdio.h>, <wctype.h>
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74       Portions  of  this text are reprinted and reproduced in electronic form
75       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
76       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
77       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
78       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
79       event of any discrepancy between this version and the original IEEE and
80       The  Open Group Standard, the original IEEE and The Open Group Standard
81       is the referee document. The original Standard can be  obtained  online
82       at http://www.opengroup.org/unix/online.html .
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84       Any  typographical  or  formatting  errors that appear in this page are
85       most likely to have been introduced during the conversion of the source
86       files  to  man page format. To report such errors, see https://www.ker‐
87       nel.org/doc/man-pages/reporting_bugs.html .
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91IEEE/The Open Group                  2017                         ISWALNUM(3P)
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