wcwidth(3)

NAME
wcwidth - determine columns needed for a wide character

LIBRARY
Standard C library (libc, -lc)

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

int wcwidth(wchar_t c);

DESCRIPTION
The wcwidth() function returns the number of columns needed to represent the wide character c. If c is a printable wide character, the value is at least 0. If c is null wide character (L'\0'), the value is 0. Otherwise, -1 is returned.

RETURN VALUE
The wcwidth() function returns the number of column positions for c.

ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value
 | Thread safety | MT-Safe locale

STANDARDS
POSIX.1-2008.

HISTORY
POSIX.1-2001.

Note that before glibc 2.2.5, glibc used the prototype

int wcwidth(wint_t c);

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

SEE ALSO
iswprint(3), wcswidth(3)