1WCWIDTH(3P)                POSIX Programmer's Manual               WCWIDTH(3P)
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PROLOG

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

13       wcwidth — number of column positions of a wide-character code
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SYNOPSIS

16       #include <wchar.h>
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18       int wcwidth(wchar_t wc);
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DESCRIPTION

21       The wcwidth() function shall determine the number of  column  positions
22       required  for the wide character wc.  The application shall ensure that
23       the value of wc is a character representable as a  wchar_t,  and  is  a
24       wide-character  code  corresponding to a valid character in the current
25       locale.
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RETURN VALUE

28       The wcwidth() function shall either return 0 (if wc  is  a  null  wide-
29       character  code),  or return the number of column positions to be occu‐
30       pied by the wide-character code wc, or return −1 (if wc does not corre‐
31       spond to a printable wide-character code).
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ERRORS

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       This  function  was  removed from the final ISO/IEC 9899:1990/Amendment
43       1:1995 (E), and the return value for a non-printable wide character  is
44       not specified.
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RATIONALE

47       None.
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FUTURE DIRECTIONS

50       None.
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SEE ALSO

53       wcswidth()
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55       The Base Definitions volume of POSIX.1‐2008, <wchar.h>
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58       Portions  of  this text are reprinted and reproduced in electronic form
59       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
60       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
61       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
62       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
63       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
64       event of any discrepancy between this version and the original IEEE and
65       The Open Group Standard, the original IEEE and The Open Group  Standard
66       is  the  referee document. The original Standard can be obtained online
67       at http://www.unix.org/online.html .
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69       Any typographical or formatting errors that appear  in  this  page  are
70       most likely to have been introduced during the conversion of the source
71       files to man page format. To report such errors,  see  https://www.ker‐
72       nel.org/doc/man-pages/reporting_bugs.html .
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76IEEE/The Open Group                  2013                          WCWIDTH(3P)
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