wcswidth — determine columns needed for a fixed-size wide-character string


#define _XOPEN_SOURCE             /* See feature_test_macros(7) */
#include <wchar.h>

int wcswidth(const wchar_t *s, size_t n);


The wcswidth() function returns the number of columns needed to represent the wide-character string pointed to by s, but at most n wide characters. If a nonprintable wide character occurs among these characters, -1 is returned.

Return Value

The wcswidth() function returns the number of column positions for the wide-character string s, truncated to at most length n.


For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
wcswidth() Thread safety MT-Safe locale

Conforming to

POSIX.1-2001, POSIX.1-2008.


The behavior of wcswidth() depends on the LC_CTYPE category of the current locale.

See Also

iswprint(3), wcwidth(3)


This page is part of release 5.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Referenced By

unigenwidth(1), utf-8(7), wcwidth(3).

2015-08-08 GNU Linux Programmer's Manual