1ISWBLANK(3P) POSIX Programmer's Manual ISWBLANK(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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13 iswblank, iswblank_l — test for a blank wide-character code
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16 #include <wctype.h>
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18 int iswblank(wint_t wc);
19 int iswblank_l(wint_t wc, locale_t locale);
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22 For iswblank(): The functionality described on this reference page is
23 aligned with the ISO C standard. Any conflict between the requirements
24 described here and the ISO C standard is unintentional. This volume of
25 POSIX.1‐2008 defers to the ISO C standard.
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27 The iswblank() and iswblank() functions shall test whether wc is a
28 wide-character code representing a character of class blank in the cur‐
29 rent locale, or in the locale represented by locale, respectively; see
30 the Base Definitions volume of POSIX.1‐2008, Chapter 7, 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 current locale, or equal to the value of the macro WEOF. If the
35 argument has any other value, the behavior is undefined.
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37 The behavior is undefined if the locale argument to iswblank_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 iswblank() and iswblank_l() functions shall return non-zero if wc
43 is a blank 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 iswalnum(), iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(),
67 iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(),
68 iswxdigit(), setlocale(), uselocale()
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70 The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
71 <locale.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, 2013 Edition, Standard for Information Technology
76 -- Portable Operating System Interface (POSIX), The Open Group Base
77 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
78 cal and Electronics Engineers, Inc and The Open Group. (This is
79 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
80 event of any discrepancy between this version and the original IEEE and
81 The Open Group Standard, the original IEEE and The Open Group Standard
82 is the referee document. The original Standard can be obtained online
83 at http://www.unix.org/online.html .
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85 Any typographical or formatting errors that appear in this page are
86 most likely to have been introduced during the conversion of the source
87 files to man page format. To report such errors, see https://www.ker‐
88 nel.org/doc/man-pages/reporting_bugs.html .
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92IEEE/The Open Group 2013 ISWBLANK(3P)