WCWIDTH(3) BSD Library Functions Manual WCWIDTH(3)

NAME
     wwccwwiiddtthh, wwccwwiiddtthhll - number of column positions of a wide-character code

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     wwccwwiiddtthh(wchart wc);

     ##iinncclluuddee <>

     int
     wwccwwiiddtthhll(wchart wc, localet loc);

DESCRIPTION
     The wwccwwiiddtthh() function determines the number of column positions required
     to display the wide character wc.

     While the wwccwwiiddtthh() function uses the current locale, the wwccwwiiddtthhll()
     function may be passed a locale directly. See xlocale(3) for more infor-
     mation.

RETURN VALUES
     The wwccwwiiddtthh() function returns 0 if the wc argument is a null wide char-
     acter (L'\0'), -1 if wc is not printable, otherwise it returns the number
     of column positions the character occupies.

EEXXAAMMPPLLEESS
     This code fragment reads text from standard input and breaks lines that
     are more than 20 column positions wide, similar to the fold(1) utility:

           wintt ch;
           int column, w;

           column = 0;
           while ((ch = getwchar()) != WEOF) {
                   w = wcwidth(ch);
                   if (w > 0 && column + w >= 20) {
                           putwchar(L'\n');
                           column = 0;
                   }
                   putwchar(ch);
                   if (ch == L'\n')
                           column = 0;
                   else if (w > 0)
                           column += w;
           }

SEE ALSO
     iswprint(3), wcswidth(3), xlocale(3)

STANDARDS
     The wwccwwiiddtthh() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD                             August 17, 2004                            BSD