1ISWALNUM(3P) POSIX Programmer's Manual ISWALNUM(3P)
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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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12 iswalnum, iswalnum_l — test for an alphanumeric wide-character code
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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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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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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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46 No errors are defined.
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48 The following sections are informative.
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51 None.
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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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60 None.
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63 None.
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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)