WCSWIDTH(3) Linux Programmer's Manual WCSWIDTH(3)

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.

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

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

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

iswprint(3), wcwidth(3)
2015-08-08 GNU