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

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

26       The wcswidth() function either shall return 0 (if pwcs points to a null
27       wide-character code), or return the number of column  positions  to  be
28       occupied  by the wide-character string pointed to by pwcs, or return -1
29       (if any of the first  n  wide-character  codes  in  the  wide-character
30       string pointed to by pwcs is not a printable wide-character code).
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ERRORS

33       No errors are defined.
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35       The following sections are informative.
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EXAMPLES

38       None.
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APPLICATION USAGE

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

46       None.
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FUTURE DIRECTIONS

49       None.
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SEE ALSO

52       wcwidth()
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54       The  Base  Definitions  volume  of  POSIX.1‐2017, Section 3.103, Column
55       Position, <wchar.h>
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58       Portions of this text are reprinted and reproduced in  electronic  form
59       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
60       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
61       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
62       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
63       event of any discrepancy between this version and the original IEEE and
64       The Open Group Standard, the original IEEE and The Open Group  Standard
65       is  the  referee document. The original Standard can be obtained online
66       at http://www.opengroup.org/unix/online.html .
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68       Any typographical or formatting errors that appear  in  this  page  are
69       most likely to have been introduced during the conversion of the source
70       files to man page format. To report such errors,  see  https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
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75IEEE/The Open Group                  2017                         WCSWIDTH(3P)
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