| 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<wmemcmp>>---compare wide characters in memory |
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| 4 | |
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| 5 | SYNOPSIS |
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| 6 | #include <wchar.h> |
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| 7 | int wmemcmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>); |
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| 8 | |
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| 9 | DESCRIPTION |
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| 10 | The <<wmemcmp>> function compares the first <[n]> wide characters of the |
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| 11 | object pointed to by <[s1]> to the first <[n]> wide characters of the |
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| 12 | object pointed to by <[s2]>. This function is not affected by locale |
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| 13 | and all wchar_t values are treated identically. The null wide character |
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| 14 | and wchar_t values not corresponding to valid characters are not treated |
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| 15 | specially. |
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| 16 | |
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| 17 | If <[n]> is zero, <[s1]> and <[s2]> must be a valid pointers and the |
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| 18 | function behaves as if the two objects compare equal. |
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| 19 | |
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| 20 | RETURNS |
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| 21 | The <<wmemcmp>> function returns an integer greater than, equal to, |
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| 22 | or less than zero, accordingly as the object pointed to by <[s1]> is |
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| 23 | greater than, equal to, or less than the object pointed to by <[s2]>. |
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| 24 | |
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| 25 | PORTABILITY |
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| 26 | <<wmemcmp>> is ISO/IEC 9899/AMD1:1995 (ISO C). |
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| 27 | |
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| 28 | No supporting OS subroutines are required. |
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| 29 | */ |
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| 30 | |
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| 31 | /* $NetBSD: wmemcmp.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */ |
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| 32 | |
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| 33 | /*- |
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| 34 | * Copyright (c)1999 Citrus Project, |
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| 35 | * All rights reserved. |
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| 36 | * |
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| 37 | * Redistribution and use in source and binary forms, with or without |
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| 38 | * modification, are permitted provided that the following conditions |
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| 39 | * are met: |
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| 40 | * 1. Redistributions of source code must retain the above copyright |
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| 41 | * notice, this list of conditions and the following disclaimer. |
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| 42 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 43 | * notice, this list of conditions and the following disclaimer in the |
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| 44 | * documentation and/or other materials provided with the distribution. |
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| 45 | * |
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| 46 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 49 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 56 | * SUCH DAMAGE. |
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| 57 | * |
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| 58 | * citrus Id: wmemcmp.c,v 1.2 2000/12/20 14:08:31 itojun Exp |
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| 59 | */ |
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| 60 | |
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| 61 | #include <_ansi.h> |
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| 62 | #include <wchar.h> |
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| 63 | |
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| 64 | int |
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| 65 | wmemcmp (const wchar_t * s1, |
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| 66 | const wchar_t * s2, |
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| 67 | size_t n) |
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| 68 | { |
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| 69 | size_t i; |
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| 70 | |
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| 71 | for (i = 0; i < n; i++) |
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| 72 | { |
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| 73 | if (*s1 != *s2) |
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| 74 | { |
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| 75 | /* wchar might be unsigned */ |
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| 76 | return *s1 > *s2 ? 1 : -1; |
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| 77 | } |
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| 78 | s1++; |
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| 79 | s2++; |
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| 80 | } |
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| 81 | return 0; |
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| 82 | } |
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