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

12       wcwidth - number of column positions of a wide-character code
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SYNOPSIS

15       #include <wchar.h>
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17       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(),   the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
54       <wchar.h>
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57       Portions of this text are reprinted and reproduced in  electronic  form
58       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
59       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
60       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
61       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
62       event of any discrepancy between this version and the original IEEE and
63       The Open Group Standard, the original IEEE and The Open Group  Standard
64       is  the  referee document. The original Standard can be obtained online
65       at http://www.opengroup.org/unix/online.html .
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69IEEE/The Open Group                  2003                          WCWIDTH(3P)
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