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WCWIDTH(3)	      DragonFly 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 charac-
     ter (L'\0'), -1 if wc is not printable, otherwise it returns the number
     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) utility:

	   wint_t 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)

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

DragonFly 3.5			 May 30, 2008			 DragonFly 3.5