| 1 | /* |
|---|
| 2 | FUNCTION |
|---|
| 3 | <<wcsncmp>>---compare part of two wide-character strings |
|---|
| 4 | |
|---|
| 5 | SYNOPSIS |
|---|
| 6 | #include <wchar.h> |
|---|
| 7 | int wcsncmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>); |
|---|
| 8 | |
|---|
| 9 | DESCRIPTION |
|---|
| 10 | The <<wcsncmp>> function compares not more than <[n]> wide-character |
|---|
| 11 | codes (wide-character codes that follow a null wide-character code are |
|---|
| 12 | not compared) from the array pointed to by <[s1]> to the array pointed |
|---|
| 13 | to by <[s2]>. |
|---|
| 14 | |
|---|
| 15 | The sign of a non-zero return value is determined by the sign of the |
|---|
| 16 | difference between the values of the first pair of wide-character codes |
|---|
| 17 | that differ in the objects being compared. |
|---|
| 18 | |
|---|
| 19 | RETURNS |
|---|
| 20 | Upon successful completion, <<wcsncmp>> returns an integer greater than, |
|---|
| 21 | equal to or less than 0, if the possibly null-terminated array pointed |
|---|
| 22 | to by <[s1]> is greater than, equal to or less than the possibly |
|---|
| 23 | null-terminated array pointed to by <[s2]> respectively. |
|---|
| 24 | |
|---|
| 25 | PORTABILITY |
|---|
| 26 | <<wcsncmp>> is ISO/IEC 9899/AMD1:1995 (ISO C). |
|---|
| 27 | |
|---|
| 28 | No supporting OS subroutines are required. |
|---|
| 29 | */ |
|---|
| 30 | |
|---|
| 31 | /* $NetBSD$ */ |
|---|
| 32 | |
|---|
| 33 | /* |
|---|
| 34 | * Copyright (c) 1989, 1993 |
|---|
| 35 | * The Regents of the University of California. All rights reserved. |
|---|
| 36 | * |
|---|
| 37 | * Redistribution and use in source and binary forms, with or without |
|---|
| 38 | * modification, are permitted provided that the following conditions |
|---|
| 39 | * are met: |
|---|
| 40 | * 1. Redistributions of source code must retain the above copyright |
|---|
| 41 | * notice, this list of conditions and the following disclaimer. |
|---|
| 42 | * 2. Redistributions in binary form must reproduce the above copyright |
|---|
| 43 | * notice, this list of conditions and the following disclaimer in the |
|---|
| 44 | * documentation and/or other materials provided with the distribution. |
|---|
| 45 | * 3. Neither the name of the University nor the names of its contributors |
|---|
| 46 | * may be used to endorse or promote products derived from this software |
|---|
| 47 | * without specific prior written permission. |
|---|
| 48 | * |
|---|
| 49 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
|---|
| 50 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|---|
| 51 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|---|
| 52 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
|---|
| 53 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|---|
| 54 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
|---|
| 55 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|---|
| 56 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|---|
| 57 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|---|
| 58 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
|---|
| 59 | * SUCH DAMAGE. |
|---|
| 60 | */ |
|---|
| 61 | |
|---|
| 62 | #include <_ansi.h> |
|---|
| 63 | #include <wchar.h> |
|---|
| 64 | |
|---|
| 65 | int |
|---|
| 66 | wcsncmp (const wchar_t * s1, |
|---|
| 67 | const wchar_t * s2, |
|---|
| 68 | size_t n) |
|---|
| 69 | { |
|---|
| 70 | |
|---|
| 71 | if (n == 0) |
|---|
| 72 | return (0); |
|---|
| 73 | do |
|---|
| 74 | { |
|---|
| 75 | if (*s1 != *s2++) |
|---|
| 76 | { |
|---|
| 77 | return (*s1 - *--s2); |
|---|
| 78 | } |
|---|
| 79 | if (*s1++ == 0) |
|---|
| 80 | break; |
|---|
| 81 | } |
|---|
| 82 | while (--n != 0); |
|---|
| 83 | return (0); |
|---|
| 84 | } |
|---|
