1ISWALPHA(3)                Linux Programmer's Manual               ISWALPHA(3)
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NAME

6       iswalpha - test for alphabetic wide character
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SYNOPSIS

9       #include <wctype.h>
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11       int iswalpha(wint_t wc);
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DESCRIPTION

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

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

47       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
48       tributes(7).
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50       ┌─────────────────────────────────────┬───────────────┬────────────────┐
51       │Interface                            │ Attribute     │ Value          │
52       ├─────────────────────────────────────┼───────────────┼────────────────┤
53       │iswalpha()                           │ Thread safety │ MT-Safe locale │
54       └─────────────────────────────────────┴───────────────┴────────────────┘
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CONFORMING TO

57       POSIX.1-2001, POSIX.1-2008, C99.
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NOTES

60       The behavior of iswalpha() depends on the LC_CTYPE category of the cur‐
61       rent locale.
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SEE ALSO

64       isalpha(3), iswctype(3)
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COLOPHON

67       This page is part of release 5.12 of the Linux  man-pages  project.   A
68       description  of  the project, information about reporting bugs, and the
69       latest    version    of    this    page,    can     be     found     at
70       https://www.kernel.org/doc/man-pages/.
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74GNU                               2021-03-22                       ISWALPHA(3)
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