wctype(3)

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

6       wctype - wide-character classification
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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       wctype_t wctype(const char *name);
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DESCRIPTION

17       The  wctype_t  type represents a property which a wide character may or
18       may not have.  In other words, it represents a class  of  wide  charac‐
19       ters.   This type's nature is implementation-dependent, but the special
20       value (wctype_t) 0 denotes an invalid property.  Nonzero wctype_t  val‐
21       ues  can be passed to the iswctype(3) function to actually test whether
22       a given wide character has the property.
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24       The wctype() function returns a property, given by its name.   The  set
25       of  valid names depends on the LC_CTYPE category of the current locale,
26       but the following names are valid in all locales.
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28           "alnum" - realizes the isalnum(3) classification function
29           "alpha" - realizes the isalpha(3) classification function
30           "blank" - realizes the isblank(3) classification function
31           "cntrl" - realizes the iscntrl(3) classification function
32           "digit" - realizes the isdigit(3) classification function
33           "graph" - realizes the isgraph(3) classification function
34           "lower" - realizes the islower(3) classification function
35           "print" - realizes the isprint(3) classification function
36           "punct" - realizes the ispunct(3) classification function
37           "space" - realizes the isspace(3) classification function
38           "upper" - realizes the isupper(3) classification function
39           "xdigit" - realizes the isxdigit(3) classification function
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RETURN VALUE

42       The wctype() function returns a property  descriptor  if  the  name  is
43       valid.  Otherwise, it returns (wctype_t) 0.
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ATTRIBUTES

46       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
47       tributes(7).
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49       ┌─────────────────────────────────────┬───────────────┬────────────────┐
50       │Interface                            │ Attribute     │ Value          │
51       ├─────────────────────────────────────┼───────────────┼────────────────┤
52       │wctype()                             │ Thread safety │ MT-Safe locale │
53       └─────────────────────────────────────┴───────────────┴────────────────┘
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STANDARDS

56       C11, POSIX.1-2008.
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HISTORY

59       POSIX.1-2001, C99.
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NOTES

62       The behavior of wctype() depends on the LC_CTYPE category of  the  cur‐
63       rent locale.
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