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)