positions

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

NAME

     wcwidth -- number of column positions of a wide-character code

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <wchar.h>

     int
     wcwidth(wchar_t wc);

DESCRIPTION

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

RETURN VALUES

     The wcwidth() function returns 0 if the wc argument is a nul wide character (L''), -1 if wc is not printable, otherwise it returns the num-
     ber of column positions the character occupies.

EXAMPLES

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

	   wint_t ch;
	   int column, w;

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

SEE ALSO

     iswprint(3), wcswidth(3)

STANDARDS

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

BSD
								  August 17, 2004							       BSD