WCWIDTH(3)                 POSIX Programmer's Manual                WCWIDTH(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       wcwidth -- number of column positions of a wide-character code

SSYYNNOOPPSSIISS
       #include <wchar.h>

       int wcwidth(wchar_t _w_c);

DDEESSCCRRIIPPTTIIOONN
       The _w_c_w_i_d_t_h() function shall determine the number of column positions
       required for the wide character _w_c.  The application shall ensure that
       the value of _w_c is a character representable as a wwcchhaarr__tt, and is a
       wide-character code corresponding to a valid character in the current
       locale.

RREETTUURRNN VVAALLUUEE
       The _w_c_w_i_d_t_h() function shall either return 0 (if _w_c is a null wide-
       character code), or return the number of column positions to be
       occupied by the wide-character code _w_c, or return -1 (if _w_c does not
       correspond to a printable wide-character code).

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       This function was removed from the final ISO/IEC 9899:1990/Amendment
       1:1995 (E), and the return value for a non-printable wide character is
       not specified.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _w_c_s_w_i_d_t_h()

       The Base Definitions volume of POSIX.1-2017, <<wwcchhaarr..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                           WCWIDTH(3)
