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

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

27       The wcwidth() function shall either return 0 (if wc  is  a  null  wide-
28       character  code),  or return the number of column positions to be occu‐
29       pied by the wide-character code wc, or return -1 (if wc does not corre‐
30       spond to 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       wcswidth()
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54       The Base Definitions volume of POSIX.1‐2017, <wchar.h>
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57       Portions  of  this text are reprinted and reproduced in electronic form
58       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
59       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
60       cations Issue 7, 2018 Edition, Copyright (C) 2018 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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67       Any  typographical  or  formatting  errors that appear in this page are
68       most likely to have been introduced during the conversion of the source
69       files  to  man page format. To report such errors, see https://www.ker‐
70       nel.org/doc/man-pages/reporting_bugs.html .
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74IEEE/The Open Group                  2017                          WCWIDTH(3P)
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