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/*
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* Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* FUNCTION
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* <<strncmp>>---character string compare
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* INDEX
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* strncmp
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* ANSI_SYNOPSIS
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* #include <string.h>
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* int strncmp(const char *<[a]>, const char * <[b]>, size_t <[length]>);
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* TRAD_SYNOPSIS
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* #include <string.h>
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* int strncmp(<[a]>, <[b]>, <[length]>)
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* char *<[a]>;
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* char *<[b]>;
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* size_t <[length]>
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* <<strncmp>> compares up to <[length]> characters
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* from the string at <[a]> to the string at <[b]>.
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* RETURNS
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* If <<*<[a]>>> sorts lexicographically after <<*<[b]>>>,
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* <<strncmp>> returns a number greater than zero. If the two
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* strings are equivalent, <<strncmp>> returns zero. If <<*<[a]>>>
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* sorts lexicographically before <<*<[b]>>>, <<strncmp>> returns a
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* number less than zero.
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* PORTABILITY
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* <<strncmp>> is ANSI C.
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* <<strncmp>> requires no supporting OS subroutines.
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* QUICKREF
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* strncmp ansi pure
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*
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*
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*/
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#include <string.h>
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/**
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Compare some characters of two strings.
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Compares the first num characters of string1 to the first num characters of string2.
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The comparison is performed character by character.
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If a character that is not equal in both strings is found the function ends
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and returns a value that determines which of them was greater.
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@return a value indicating the lexicographical relation between the strings.
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@param s1 Null-terminated string to compare
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@param s2 Null-terminated string to compare.
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@param n Maximum number of characters to compare.
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*/
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EXPORT_C int
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strncmp (const char *s1, const char *s2, size_t n)
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{
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const unsigned char* p1 = (const unsigned char*)s1;
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const unsigned char* p2 = (const unsigned char*)s2;
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if (n == 0)
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return 0;
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for (;;)
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{
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int c1 = *p1++;
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int d = c1 - *p2++;
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if (d != 0)
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return d;
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if (c1 == 0)
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return d;
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if (--n == 0)
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return d;
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}
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}
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