iswalpha(3)

1iswalpha(3)                Library Functions Manual                iswalpha(3)
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NAME

6       iswalpha - test for alphabetic wide character
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <wctype.h>
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14       int iswalpha(wint_t wc);
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DESCRIPTION

17       The  iswalpha()  function is the wide-character equivalent of the isal‐
18       pha(3) function.  It tests whether wc is a wide character belonging  to
19       the wide-character class "alpha".
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21       The  wide-character  class  "alpha" is a subclass of the wide-character
22       class "alnum", and therefore also  a  subclass  of  the  wide-character
23       class "graph" and of the wide-character class "print".
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25       Being  a subclass of the wide-character class "print", the wide-charac‐
26       ter class "alpha" is disjoint from the wide-character class "cntrl".
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28       Being a subclass of the wide-character class "graph", the  wide-charac‐
29       ter class "alpha" is disjoint from the wide-character class "space" and
30       its subclass "blank".
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32       Being a subclass of the wide-character class "alnum", the  wide-charac‐
33       ter class "alpha" is disjoint from the wide-character class "punct".
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35       The  wide-character  class  "alpha" is disjoint from the wide-character
36       class "digit".
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38       The wide-character class "alpha" contains  the  wide-character  classes
39       "upper" and "lower".
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41       The  wide-character  class "alpha" always contains at least the letters
42       'A' to 'Z' and 'a' to 'z'.
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RETURN VALUE

45       The iswalpha() function returns nonzero if wc is a wide  character  be‐
46       longing  to  the  wide-character  class "alpha".  Otherwise, it returns
47       zero.
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ATTRIBUTES

50       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
51       tributes(7).
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53       ┌─────────────────────────────────────┬───────────────┬────────────────┐
54       │Interface                            │ Attribute     │ Value          │
55       ├─────────────────────────────────────┼───────────────┼────────────────┤
56       │iswalpha()                           │ Thread safety │ MT-Safe locale │
57       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

60       C11, POSIX.1-2008.
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HISTORY

63       POSIX.1-2001, C99.
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NOTES

66       The behavior of iswalpha() depends on the LC_CTYPE category of the cur‐
67       rent locale.
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