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man:wcswidth

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  repre-
     sent  the  wide-character  string  pointed  to by s, but at most n wide
     characters.  If a nonprintable wide character occurs among these  char-
     acters, -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

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

CONFORMING TO

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

NOTES

     The behavior of wcswidth() depends on the LC_CTYPE category of the cur-
     rent locale.

SEE ALSO

     iswprint(3), wcwidth(3)

COLOPHON

     This page is part of release 4.16 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
     https://www.kernel.org/doc/man-pages/.

GNU 2015-08-08 WCSWIDTH(3)

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