expandtest.cxx

SIP（Session Initiation Protocol）是由IETF定义

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static const char* const ExpandTest_cxx_Version =
    "$Id: ExpandTest.cxx,v 1.6 2002/02/25 05:55:35 sprajpat Exp $";
#include "global.h"
#include <iostream>
#include <string>

static const string RecordRoute( "Record-Route: " );
static const string Route( "Route: " );
static const string Via( "Via: ");
static const string local_CRLF( "\r\n" );
static const string Comma( "," );
static const string ReplaceRecordRouteComma( local_CRLF + RecordRoute );
static const string ReplaceRouteComma( local_CRLF + Route );
static const string ReplaceViaComma( local_CRLF + Via );


static string
expand( string inString )
{
    string::size_type rrPos = inString.find( RecordRoute );
    // cout << "rrPos = " << rrPos << endl;
    if ( rrPos < string::npos )
    {
        string::size_type crlfPos = inString.find( local_CRLF, rrPos );
        //  cout << "crlfPos = " << crlfPos << endl;
        string::size_type commaPos = inString.find( Comma, rrPos );
        // cout << "commaPos = " << commaPos << endl;
        while ( commaPos < crlfPos )
        {
            // found comma
            inString.replace( commaPos, 1, ReplaceRecordRouteComma );

            // find next
            string::size_type newCommaPos = inString.find( Comma, commaPos );
            if ( (commaPos + 1) < inString.length() )
            {
                crlfPos = inString.find( local_CRLF, commaPos + 1 );
            }
            commaPos = newCommaPos;
            //  cout << "commaPos = " << commaPos << endl;
        }

    }

    {
        string::size_type rrPos = inString.find( Route );
        // cout << "rrPos = " << rrPos << endl;
        if ( rrPos < string::npos )
        {
            string::size_type crlfPos = inString.find( local_CRLF, rrPos );
            // cout << "crlfPos = " << crlfPos << endl;
            string::size_type commaPos = inString.find( Comma, rrPos );
            // cout << "commaPos = " << commaPos << endl;
            while ( commaPos < crlfPos )
            {
                // found comma
                inString.replace( commaPos, 1, ReplaceRouteComma );

                // find next
                string::size_type newCommaPos = inString.find( Comma, commaPos );
                if ( (commaPos + 1) < inString.length() )
                {
                    crlfPos = inString.find( local_CRLF, commaPos + 1 );
                }
                commaPos = newCommaPos;
                //  cout << "commaPos = " << commaPos << endl;
            }

        }
    }

    {
        string::size_type rrPos = inString.find( Via );
        // cout << "rrPos = " << rrPos << endl;
        if ( rrPos < string::npos )
        {
            string::size_type crlfPos = inString.find( local_CRLF, rrPos );
            // cout << "crlfPos = " << crlfPos << endl;
            string::size_type commaPos = inString.find( Comma, rrPos );
            // cout << "commaPos = " << commaPos << endl;
            while ( commaPos < crlfPos )
            {
                // found comma
                inString.replace( commaPos, 1, ReplaceViaComma );

                // find next
                string::size_type newCommaPos = inString.find( Comma, commaPos );
                if ( (commaPos + 1) < inString.length() )
                {
                    crlfPos = inString.find( local_CRLF, commaPos + 1 );
                }
                commaPos = newCommaPos;
                //  cout << "commaPos = " << commaPos << endl;
            }

        }

    }

    return inString;
}


int main()
{
    char buf[65000];

    cin.read(buf, 65000);

    string s = expand(buf);
    cout << s << endl;
}