| 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<wcsnlen>>---get fixed-size wide-character string length |
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| 4 | |
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| 5 | INDEX |
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| 6 | wcsnlen |
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| 7 | |
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| 8 | SYNOPSIS |
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| 9 | #include <wchar.h> |
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| 10 | size_t wcsnlen(const wchar_t *<[s]>, size_t <[maxlen]>); |
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| 11 | |
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| 12 | DESCRIPTION |
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| 13 | The <<wcsnlen>> function computes the number of wide-character codes |
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| 14 | in the wide-character string pointed to by <[s]> not including the |
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| 15 | terminating L'\0' wide character but at most <[maxlen]> wide |
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| 16 | characters. |
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| 17 | |
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| 18 | RETURNS |
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| 19 | <<wcsnlen>> returns the length of <[s]> if it is less then <[maxlen]>, |
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| 20 | or <[maxlen]> if there is no L'\0' wide character in first <[maxlen]> |
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| 21 | characters. |
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| 22 | |
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| 23 | PORTABILITY |
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| 24 | <<wcsnlen>> is a GNU extension. |
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| 25 | |
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| 26 | <<wcsnlen>> requires no supporting OS subroutines. |
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| 27 | */ |
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| 28 | |
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| 29 | /* |
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| 30 | * Copyright (c) 2003, Artem B. Bityuckiy (dedekind@mail.ru). |
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| 31 | * |
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| 32 | * Redistribution and use in source and binary forms, with or without |
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| 33 | * modification, are permitted provided that the above copyright notice, |
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| 34 | * this condition statement, and the following disclaimer are retained |
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| 35 | * in any redistributions of the source code. |
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| 36 | * |
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| 37 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 38 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 39 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 40 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 41 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 42 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 43 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 44 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 45 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 46 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 47 | * SUCH DAMAGE. |
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| 48 | */ |
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| 49 | |
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| 50 | #include <_ansi.h> |
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| 51 | #include <sys/types.h> |
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| 52 | #include <wchar.h> |
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| 53 | |
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| 54 | size_t |
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| 55 | wcsnlen (const wchar_t *s, |
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| 56 | size_t maxlen) |
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| 57 | { |
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| 58 | const wchar_t *p; |
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| 59 | |
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| 60 | p = s; |
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| 61 | while (*p && maxlen-- > 0) |
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| 62 | p++; |
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| 63 | |
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| 64 | return (size_t)(p - s); |
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| 65 | } |
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| 66 | |
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| 67 | |
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| 68 | |
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