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



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

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

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

DESCRIPTION
       The wcswidth() function returns the number of columns needed to represent the wide-charac‐
       ter string pointed to by s, but at most n wide characters.  If a nonprintable wide charac‐
       ter 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.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The wcswidth() 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.

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

SEE ALSO
       iswprint(3), wcwidth(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                                WCSWIDTH(3)