wctype() — Get Handle for Character Property Classification
Format
#include <wctype.h>
wctype_t wctype(const char *property);Language Level
XPG4
Threadsafe
Yes
Description
The wctype() function
is defined for valid character class names. The property is
a string that identifies a generic character class. These character
class names are defined in all locales: alnum, alpha, blank, cntrl, digit, graph, lower, print, punct, space, upper, xdigit.
The function returns a value of type wctype_t, which can
be used as the second argument to a call of the iswctype() function.
The wctype() function
determines values of wctype_t according to rules of the coded
character set that are defined by character type information in the
program's locale (category LC_CTYPE). Values that are returned by
the wctype() are
valid until a call to setlocale() that
changes the category LC_CTYPE.
Return Value
The wctype() function
returns zero if the given property name is not valid. Otherwise, it
returns a value of type wctype_t that can be used in calls
to iswctype().
Example
#include <wchar.h>
#define UPPER_LIMIT 0xFF
int main(void)
{
int wc;
for (wc = 0; wc <= UPPER_LIMIT; wc++) {
printf("%#4x ", wc);
printf("%c", iswctype(wc, wctype("print")) ? wc : ' ');
printf("%s", iswctype(wc, wctype("alnum")) ? "AN" : " ");
printf("%s", iswctype(wc, wctype("alpha")) ? "A" : " ");
printf("%s", iswctype(wc, wctype("blank")) ? "B" : " ");
printf("%s", iswctype(wc, wctype("cntrl")) ? "C" : " ");
printf("%s", iswctype(wc, wctype("digit")) ? "D" : " ");
printf("%s", iswctype(wc, wctype("graph")) ? "G" : " ");
printf("%s", iswctype(wc, wctype("lower")) ? "L" : " ");
printf("%s", iswctype(wc, wctype("punct")) ? "PU" : " ");
printf("%s", iswctype(wc, wctype("space")) ? "S" : " ");
printf("%s", iswctype(wc, wctype("print")) ? "PR" : " ");
printf("%s", iswctype(wc, wctype("upper")) ? "U" : " ");
printf("%s", iswctype(wc, wctype("xdigit")) ? "X" : " ");
putchar('\n');
}
return 0;
}
/***********************************************************************
The output should be similar to :
:
0x1f C
0x20 B S PR
0x21 ! G PU PR
0x22 " G PU PR
0x23 # G PU PR
0x24 $ G PU PR
0x25 % G PU PR
0x26 & G PU PR
0x27 ' G PU PR
0x28 ( G PU PR
0x29 ) G PU PR
0x2a * G PU PR
0x2b + G PU PR
0x2c , G PU PR
0x2d - G PU PR
0x2e . G PU PR
0x2f / G PU PR
0x30 0 AN D G PR X
0x31 1 AN D G PR X
0x32 2 AN D G PR X
0x33 3 AN D G PR X
0x34 4 AN D G PR X
0x35 5 AN D G PR X
:
***********************************************************************/