NAME

wctype: iswalpha, iswupper, iswlower, iswdigit, iswxdigit, iswalnum, iswspace, iswpunct, iswprint, iswgraph, iswcntrl, iswascii, isphonogram, isideogram, isenglish, isnumber, isspecial − classify ASCII and supplemetary code set characters

SYNOPSIS

#include <ctype.h>
#include <widec.h>
#include <wctype.h> int iswalpha(wchar_t c); ...

DESCRIPTION

These functions classify character-coded wchar_t values by table lookup.  Each is a predicate returning nonzero for true, zero for false.  The lookup table is generated by wchrtbl(1M).  Each of these functions operates on both ASCII and supplementary code sets unless otherwise indicated. 

iswalpha(c) c is an English letter. 

iswupper(c) c is an English upper-case letter. 

iswlower(c) c is an English lower-case letter. 

iswdigit(c) c is a digit [0−9]. 

iswxdigit(c) c is a hexadecimal digit [0−9], [A−F] or [a−f]. 

iswalnum(c) c is an alphanumeric (letter or digit). 

iswspace(c) c is a space character or a tab, carriage return, new line, vertical tab or form-feed. 

iswpunct(c) c is a punctuation character (neither control nor alphanumeric). 

iswprint(c) c is a printing character including space. 

iswgraph(c) c is a printing character, like iswprint() except false for space. 

iswcntrl(c) c is a delete character (0177), an ordinary control character (less than 040) or other control character of a supplementary code set.

iswascii(c) c is an ASCII character code less than 0200. 

isphonogram(c) c is a phonogram in a supplementary code set. 

isideogram(c) c is an ideogram in a supplementary code set. 

isenglish(c) c is an English letters in a supplementary code set. 

isnumber(c) c is a digit of a supplementary code set. 

isspecial(c) c is a special character in a supplementary code set. 

SEE ALSO

wchrtbl(1M), ctype(3C).