1ISWCTYPE(3P) POSIX Programmer's Manual ISWCTYPE(3P)
2
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.
10
13 iswctype, iswctype_l — test character for a specified class
14
16 #include <wctype.h>
17 int iswctype(wint_t wc, wctype_t charclass);
19 int iswctype_l(wint_t wc, wctype_t charclass,
20 locale_t locale);
21
23 For iswctype(): The functionality described on this reference page is
24 aligned with the ISO C standard. Any conflict between the requirements
25 described here and the ISO C standard is unintentional. This volume of
26 POSIX.1‐2008 defers to the ISO C standard.
27 The iswctype() and iswctype_l() functions shall determine whether the
29 wide-character code wc has the character class charclass, returning
30 true or false. The iswctype() and iswctype_l() functions are defined on
31 WEOF and wide-character codes corresponding to the valid character
32 encodings in the current locale, or in the locale represented by
33 locale, respectively. If the wc argument is not in the domain of the
34 function, the result is undefined. If the value of charclass is
35 invalid (that is, not obtained by a call to wctype() or charclass is
36 invalidated by a subsequent call to setlocale() that has affected cate‐
37 gory LC_CTYPE) the result is unspecified.
38 The behavior is undefined if the locale argument to iswctype_l() is the
40 special locale object LC_GLOBAL_LOCALE or is not a valid locale object
41 handle.
42
44 The iswctype() and iswctype_l() functions shall return non-zero (true)
45 if and only if wc has the property described by charclass. If char‐
46 class is 0, these functions shall return 0.
47
49 No errors are defined.
50 The following sections are informative.
52
54 Testing for a Valid Character
55 #include <wctype.h>
56 ...
57 int yes_or_no;
58 wint_t wc;
59 wctype_t valid_class;
60 ...
61 if ((valid_class=wctype("vowel")) == (wctype_t)0)
62 /* Invalid character class. */
63 yes_or_no=iswctype(wc,valid_class);
64
66 The twelve strings "alnum", "alpha", "blank", "cntrl", "digit",
67 "graph", "lower", "print", "punct", "space", "upper", and "xdigit" are
68 reserved for the standard character classes. In the table below, the
69 functions in the left column are equivalent to the functions in the
70 right column.
71 iswalnum(wc) iswctype(wc, wctype("alnum"))
73 iswalnum_l(wc, locale) iswctype_l(wc, wctype("alnum"), locale)
74 iswalpha(wc) iswctype(wc, wctype("alpha"))
75 iswalpha_l(wc, locale) iswctype_l(wc, wctype("alpha"), locale)
76 iswblank(wc) iswctype(wc, wctype("blank"))
77 iswblank_l(wc, locale) iswctype_l(wc, wctype("blank"), locale)
78 iswcntrl(wc) iswctype(wc, wctype("cntrl"))
79 iswcntrl_l(wc, locale) iswctype_l(wc, wctype("cntrl"), locale)
80 iswdigit(wc) iswctype(wc, wctype("digit"))
81 iswdigit_l(wc, locale) iswctype_l(wc, wctype("digit"), locale)
82 iswgraph(wc) iswctype(wc, wctype("graph"))
83 iswgraph_l(wc, locale) iswctype_l(wc, wctype("graph"), locale)
84 iswlower(wc) iswctype(wc, wctype("lower"))
85 iswlower_l(wc, locale) iswctype_l(wc, wctype("lower"), locale)
86 iswprint(wc) iswctype(wc, wctype("print"))
87 iswprint_l(wc, locale) iswctype_l(wc, wctype("print"), locale)
88 iswpunct(wc) iswctype(wc, wctype("punct"))
89 iswpunct_l(wc, locale) iswctype_l(wc, wctype("punct"), locale)
90 iswspace(wc) iswctype(wc, wctype("space"))
91 iswspace_l(wc, locale) iswctype_l(wc, wctype("space"), locale)
92 iswupper(wc) iswctype(wc, wctype("upper"))
93 iswupper_l(wc, locale) iswctype_l(wc, wctype("upper"), locale)
94 iswxdigit(wc) iswctype(wc, wctype("xdigit"))
95 iswxdigit_l(wc, locale) iswctype_l(wc, wctype("xdigit"), locale)
96
98 None.
99
101 None.
102
104 iswalnum(), iswalpha(), iswcntrl(), iswdigit(), iswgraph(), iswlower(),
105 iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlo‐
106 cale(), uselocale(), wctype()
107 The Base Definitions volume of POSIX.1‐2008, <locale.h>, <wctype.h>
109
111 Portions of this text are reprinted and reproduced in electronic form
112 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
113 -- Portable Operating System Interface (POSIX), The Open Group Base
114 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
115 cal and Electronics Engineers, Inc and The Open Group. (This is
116 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
117 event of any discrepancy between this version and the original IEEE and
118 The Open Group Standard, the original IEEE and The Open Group Standard
119 is the referee document. The original Standard can be obtained online
120 at http://www.unix.org/online.html .
121 Any typographical or formatting errors that appear in this page are
123 most likely to have been introduced during the conversion of the source
124 files to man page format. To report such errors, see https://www.ker‐
125 nel.org/doc/man-pages/reporting_bugs.html .
126IEEE/The Open Group 2013 ISWCTYPE(3P)