/*
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/*
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FUNCTION
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FUNCTION
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<<wcswidth>>---number of column positions of a wide-character string
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<<wcswidth>>---number of column positions of a wide-character string
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INDEX
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INDEX
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wcswidth
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wcswidth
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ANSI_SYNOPSIS
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ANSI_SYNOPSIS
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#include <wchar.h>
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#include <wchar.h>
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int wcswidth(const wchar_t *<[pwcs]>, size_t <[n]>);
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int wcswidth(const wchar_t *<[pwcs]>, size_t <[n]>);
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TRAD_SYNOPSIS
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TRAD_SYNOPSIS
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#include <wchar.h>
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#include <wchar.h>
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int wcswidth(<[pwcs]>, <[n]>)
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int wcswidth(<[pwcs]>, <[n]>)
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wchar_t *<[wc]>;
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wchar_t *<[wc]>;
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size_t <[n]>;
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size_t <[n]>;
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DESCRIPTION
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DESCRIPTION
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The <<wcswidth>> function shall determine the number of column
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The <<wcswidth>> function shall determine the number of column
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positions required for <[n]> wide-character codes (or fewer than <[n]>
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positions required for <[n]> wide-character codes (or fewer than <[n]>
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wide-character codes if a null wide-character code is encountered
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wide-character codes if a null wide-character code is encountered
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before <[n]> wide-character codes are exhausted) in the string pointed
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before <[n]> wide-character codes are exhausted) in the string pointed
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to by <[pwcs]>.
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to by <[pwcs]>.
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RETURNS
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RETURNS
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The <<wcswidth>> function either shall return 0 (if <[pwcs]> points to a
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The <<wcswidth>> function either shall return 0 (if <[pwcs]> points to a
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null wide-character code), or return the number of column positions
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null wide-character code), or return the number of column positions
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to be occupied by the wide-character string pointed to by <[pwcs]>, or
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to be occupied by the wide-character string pointed to by <[pwcs]>, or
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return -1 (if any of the first <[n]> wide-character codes in the
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return -1 (if any of the first <[n]> wide-character codes in the
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wide-character string pointed to by <[pwcs]> is not a printable
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wide-character string pointed to by <[pwcs]> is not a printable
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wide-character code).
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wide-character code).
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PORTABILITY
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PORTABILITY
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<<wcswidth>> has been introduced in the Single UNIX Specification Volume 2.
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<<wcswidth>> has been introduced in the Single UNIX Specification Volume 2.
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<<wcswidth>> has been marked as an extension in the Single UNIX Specification Volume 3.
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<<wcswidth>> has been marked as an extension in the Single UNIX Specification Volume 3.
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*/
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*/
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#include <_ansi.h>
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#include <_ansi.h>
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#include <wchar.h>
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#include <wchar.h>
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int
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int
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_DEFUN (wcswidth, (pwcs, n),
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_DEFUN (wcswidth, (pwcs, n),
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_CONST wchar_t *pwcs _AND
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_CONST wchar_t *pwcs _AND
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size_t n)
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size_t n)
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{
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{
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int w, len = 0;
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int w, len = 0;
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if (!pwcs || n == 0)
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if (!pwcs || n == 0)
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return 0;
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return 0;
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do {
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do {
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if ((w = wcwidth (*pwcs)) < 0)
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if ((w = wcwidth (*pwcs)) < 0)
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return -1;
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return -1;
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len += w;
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len += w;
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} while (*pwcs++ && --n > 0);
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} while (*pwcs++ && --n > 0);
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return len;
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return len;
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}
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}
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