genericopenlibs/cstdlib/LCHAR/STRNCPY.C
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 02:01:42 +0200
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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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* <<strncpy>>---counted copy string
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* INDEX
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* strncpy
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* ANSI_SYNOPSIS
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* #include <string.h>
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* char *strncpy(char *<[dst]>, const char *<[src]>, size_t <[length]>);
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* TRAD_SYNOPSIS
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* #include <string.h>
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* char *strncpy(<[dst]>, <[src]>, <[length]>)
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* char *<[dst]>;
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* char *<[src]>;
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* size_t <[length]>;
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* <<strncpy>> copies not more than <[length]> characters from the
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* the string pointed to by <[src]> (including the terminating
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* null character) to the array pointed to by <[dst]>.  If the
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* string pointed to by <[src]> is shorter than <[length]>
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* characters, null characters are appended to the destination
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* array until a total of <[length]> characters have been
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* RETURNS
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* This function returns the initial value of <[dst]>.
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* PORTABILITY
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* <<strncpy>> is ANSI C.
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* <<strncpy>> requires no supporting OS subroutines.
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* QUICKREF
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* strncpy 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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Copy characters from one string to another.
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Copies the first num characters of src to dest.
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No null-character is implicitly appended to dest after copying process.
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So dest may not be null-terminated if no null-caracters are copied from src.
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If num is greater than the length of src, dest is padded with zeros until num.
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@return dst is returned.
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@param dst Destination string. Space allocated should be at least 
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num characters long. 
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@param src Null-terminated string. 
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@param n Number of characters to be copied.
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*/
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EXPORT_C char *strncpy (char *dst, const char *src, size_t n)
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	{
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	char *dscan;
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	const char *sscan;
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	size_t count;
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	dscan = dst;
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	sscan = src;
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   	count = n;
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   	while (count > 0)
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    	{
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       	--count;
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       	if ((*dscan++ = *sscan++) == '\0')
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 		break;
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     	}
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   	while (count-- > 0)
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    	*dscan++ = '\0';
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   	return dst;
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	}