1WCSWIDTH(3P)               POSIX Programmer's Manual              WCSWIDTH(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       wcswidth - number of column positions of a wide-character string
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SYNOPSIS

15       #include <wchar.h>
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17       int wcswidth(const wchar_t *pwcs, size_t n);
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DESCRIPTION

21       The wcswidth() function shall determine the number of column  positions
22       required  for  n  wide-character  codes (or fewer than n wide-character
23       codes if a null wide-character code is encountered before n  wide-char‐
24       acter codes are exhausted) in the string pointed to by pwcs.
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RETURN VALUE

27       The wcswidth() function either shall return 0 (if pwcs points to a null
28       wide-character code), or return the number of column  positions  to  be
29       occupied  by the wide-character string pointed to by pwcs, or return -1
30       (if any of the first  n  wide-character  codes  in  the  wide-character
31       string pointed to by pwcs is not 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       wcwidth(), the Base Definitions volume of IEEE Std 1003.1-2001, Section
54       3.103, Column Position, <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                         WCSWIDTH(3P)
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