os/ossrv/genericopenlibs/cstdlib/LCHAR/STRNCPY.C
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib.
     1 /*
     2 * Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
     3 * All rights reserved.
     4 * This component and the accompanying materials are made available
     5 * under the terms of "Eclipse Public License v1.0"
     6 * which accompanies this distribution, and is available
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
     8 *
     9 * Initial Contributors:
    10 * Nokia Corporation - initial contribution.
    11 *
    12 * Contributors:
    13 *
    14 * Description:
    15 * FUNCTION
    16 * <<strncpy>>---counted copy string
    17 * INDEX
    18 * strncpy
    19 * ANSI_SYNOPSIS
    20 * #include <string.h>
    21 * char *strncpy(char *<[dst]>, const char *<[src]>, size_t <[length]>);
    22 * TRAD_SYNOPSIS
    23 * #include <string.h>
    24 * char *strncpy(<[dst]>, <[src]>, <[length]>)
    25 * char *<[dst]>;
    26 * char *<[src]>;
    27 * size_t <[length]>;
    28 * <<strncpy>> copies not more than <[length]> characters from the
    29 * the string pointed to by <[src]> (including the terminating
    30 * null character) to the array pointed to by <[dst]>.  If the
    31 * string pointed to by <[src]> is shorter than <[length]>
    32 * characters, null characters are appended to the destination
    33 * array until a total of <[length]> characters have been
    34 * RETURNS
    35 * This function returns the initial value of <[dst]>.
    36 * PORTABILITY
    37 * <<strncpy>> is ANSI C.
    38 * <<strncpy>> requires no supporting OS subroutines.
    39 * QUICKREF
    40 * strncpy ansi pure
    41 * 
    42 *
    43 */
    44 
    45 
    46 
    47 #include <string.h>
    48 
    49 /**
    50 Copy characters from one string to another.
    51 Copies the first num characters of src to dest.
    52 No null-character is implicitly appended to dest after copying process.
    53 So dest may not be null-terminated if no null-caracters are copied from src.
    54 If num is greater than the length of src, dest is padded with zeros until num.
    55 @return dst is returned.
    56 @param dst Destination string. Space allocated should be at least 
    57 num characters long. 
    58 @param src Null-terminated string. 
    59 @param n Number of characters to be copied.
    60 */
    61 EXPORT_C char *strncpy (char *dst, const char *src, size_t n)
    62 	{
    63 	char *dscan;
    64 	const char *sscan;
    65 	size_t count;
    66 
    67 	dscan = dst;
    68 	sscan = src;
    69    	count = n;
    70    	while (count > 0)
    71     	{
    72        	--count;
    73        	if ((*dscan++ = *sscan++) == '\0')
    74  		break;
    75      	}
    76    	while (count-- > 0)
    77     	*dscan++ = '\0';
    78  
    79    	return dst;
    80 	}