ISWCTYPE(3C)ISWCTYPE(3C)NAMEiswctype - test character for specified class
SYNOPSIS
#include <wchar.h>
int iswctype(wint_t wc, wctype_t charclass);
DESCRIPTION
The iswctype() function determines whether the wide-character code wc
has the character class charclass, returning TRUE or FALSE. The iswc‐
type() function is defined on WEOF and wide-character codes correspond‐
ing to the valid character encodings in the current locale. 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 charclass is invalidated by a subsequent call to set‐
locale(3C) that has affected category LC_CTYPE), the result is indeter‐
minate.
RETURN VALUES
The iswctype() function returns 0 for FALSE and non-zero for TRUE.
USAGE
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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────────────┤
│CSI │ Enabled │
├────────────────────┼─────────────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────────────┤
│MT-Level │ MT-Safe with exceptions │
└────────────────────┴─────────────────────────┘
SEE ALSOiswalpha(3C), setlocale(3C), wctype(3C), attributes(5), environ(5),
standards(5)
Jul 24, 2002 ISWCTYPE(3C)