util.c

电驴下载工具eMule0.47aVeryCD的源代码,可作分析测试也可用于P2P软件的开发研究.

///////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2000-2003 Intel Corporation 
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// this list of conditions and the following disclaimer. 
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///////////////////////////////////////////////////////////////////////////

/************************************************************************
* Purpose: This file contains functions for copying strings based on 
* different options.
************************************************************************/

#include "upnp.h"
#include "util.h"

/************************************************************************
*	Function :	linecopy
*
*	Parameters :
*		OUT char dest[LINE_SIZE] ;	output buffer
*		IN const char* src ;	input buffer
*
*	Description : Copy no of bytes spcified by the LINE_SIZE constant, 
*		from the source buffer. Null terminate the destination buffer
*
*	Return : void ;
*
*	Note :
************************************************************************/
void
linecopy( OUT char dest[LINE_SIZE],
          IN const char *src )
{
    strncpy( dest, src, LINE_SIZE - 1 );
    dest[LINE_SIZE - 1] = '\0'; // null-terminate if len(src) >= LINE_SIZE
}

/************************************************************************
*	Function :	namecopy
*
*	Parameters :
*		OUT char dest[UPNP_NAME_SIZE] ;	output buffer
*		IN const char* src ;	input buffer
*
*	Description : Copy no of bytes spcified by the UPNP_NAME_SIZE constant, 
*		from the source buffer. Null terminate the destination buffer
*
*	Return : void ;
*
*	Note :
************************************************************************/
void
namecopy( OUT char dest[UPNP_NAME_SIZE],
          IN const char *src )
{
    strncpy( dest, src, UPNP_NAME_SIZE - 1 );
    dest[UPNP_NAME_SIZE - 1] = '\0'; // null-terminate if len(src) >= UPNP_NAME_SIZE
}

/************************************************************************
*	Function :	linecopylen
*
*	Parameters :
*		OUT char dest[LINE_SIZE] ;	output buffer
*		IN const char* src ;	input buffer
*		IN size_t srclen ;	bytes to be copied.
*
*	Description : Determine if the srclen passed in paramter is less than 
*		the permitted LINE_SIZE. If it is use the passed parameter, if not
*		use the permitted LINE_SIZE as the length parameter
*		Copy no of bytes spcified by the LINE_SIZE constant, 
*		from the source buffer. Null terminate the destination buffer
*
*	Return : void ;
*
*	Note :
************************************************************************/
void
linecopylen( OUT char dest[LINE_SIZE],
             IN const char *src,
             IN size_t srclen )
{
    int len;

    len = srclen < ( LINE_SIZE - 1 ) ? srclen : ( LINE_SIZE - 1 );
    strncpy( dest, src, len );
    dest[len] = '\0';
}