75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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/*
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FUNCTION
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<<wcsnlen>>---get fixed-size wide character string length
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INDEX
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wcsnlen
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ANSI_SYNOPSIS
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#include <wchar.h>
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size_t wcsnlen(const wchar_t *<[s]>, size_t <[maxlen]>);
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TRAD_SYNOPSIS
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#include <wchar.h>
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size_t wcsnlen(<[s]>, <[maxlen]>)
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wchar_t *<[s]>;
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size_t <[maxlen]>;
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DESCRIPTION
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The <<wcsnlen>> function computes the number of wide character codes
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in the wide character string pointed to by <[s]> not including the
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terminating L'\0' wide character but at most <[maxlen]> wide
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characters.
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RETURNS
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<<wcsnlen>> returns the length of <[s]> if it is less then <[maxlen]>,
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or <[maxlen]> if there is no L'\0' wide character in first <[maxlen]>
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characters.
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PORTABILITY
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<<wcsnlen>> is GNU extension..
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<<wcsnlen>> requires no supporting OS subroutines.
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*/
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/*
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* Copyright (c) 2003, Artem B. Bityuckiy (dedekind@mail.ru).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the above copyright notice,
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* this condition statement, and the following disclaimer are retained
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* in any redistributions of the source code.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <_ansi.h>
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#include <sys/types.h>
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#include <wchar.h>
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size_t
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_DEFUN(wcsnlen, (s, maxlen),
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_CONST wchar_t *s _AND
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size_t maxlen)
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{
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_CONST wchar_t *p;
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p = s;
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while (*p && maxlen-- > 0)
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p++;
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return (size_t)(p - s);
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}
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