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Copyright 2014 Garrett D'Amore <garrett@damore.org>
#include <wchar.h> int iswctype(wint_t wc, wctype_t charclass);
int iswctype(wint_t wc, wctype_t charclass, locale_t loc);
The iswctype() and iswctype_l() functions determine whether the wide-character code wc is a member of the character class charclass , returning TRUE or FALSE . These functions are defined on WEOF and wide-character codes corresponding to the valid character encodings in the current locale (or loc for iswctype_l() .) If the wc argument is not in the domain of the function, the result is undefined. If the value of charclass is invalid (that is, not obtained by a call to wctype (3C) or obtained from a different locale), the result is indeterminate.
Whereas iswctype() operates in the current locale, iswctype_l() operates in the locale specified with loc .
These functions return 0 for FALSE and non-zero for TRUE .
There are twelve strings that are reserved for the standard character classes:
| "alnum" "alpha" "blank" |
| "cntrl" "digit" "graph" |
| "lower" "print" "punct" |
| "space" "upper" "xdigit" |
In the table below, the functions in the left column are equivalent to the functions in the right column.
| iswalnum(wc) iswctype(wc, wctype("alnum")) |
| iswalpha(wc) iswctype(wc, wctype("alpha")) |
| iswcntrl(wc) iswctype(wc, wctype("cntrl")) |
| iswdigit(wc) iswctype(wc, wctype("digit")) |
| iswgraph(wc) iswctype(wc, wctype("graph")) |
| iswlower(wc) iswctype(wc, wctype("lower")) |
| iswprint(wc) iswctype(wc, wctype("print")) |
| iswpunct(wc) iswctype(wc, wctype("punct")) |
| iswspace(wc) iswctype(wc, wctype("space")) |
| iswupper(wc) iswctype(wc, wctype("upper")) |
| iswxdigit(wc) iswctype(wc, wctype("xdigit")) |
The call
iswctype(wc, wctype("blank"))
does not have an equivalent isw*(\|) function.
See attributes (7) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| CSI Enabled |
| Interface Stability Standard |
| MT-Level MT-Safe |
iswalpha (3C), newlocale (3C), setlocale (3C), uselocale (3C), wctype (3C), attributes (7), standards (7)