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WCWIDTH(3) Linux Programmer's Manual WCWIDTH(3)
NAME
wcwidth - determine columns needed for a wide character
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 charac‐
ter 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
Multithreading (see pthreads(7))
The wcwidth() function is thread-safe with exceptions. It can be safely used in multi‐
threaded applications, as long as setlocale(3) is not called to change the locale during
its execution.
CONFORMING TO
POSIX.1-2001.
Note that glibc before 2.2.5 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)
COLOPHON
This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.
GNU 2014-01-22 WCWIDTH(3)
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