non/Timeline/Log_Entry.C

/*******************************************************************************/
/* Copyright (C) 2008 Jonathan Moore Liles                                     */
/*                                                                             */
/* This program is free software; you can redistribute it and/or modify it     */
/* under the terms of the GNU General Public License as published by the       */
/* Free Software Foundation; either version 2 of the License, or (at your      */
/* option) any later version.                                                  */
/*                                                                             */
/* This program is distributed in the hope that it will be useful, but WITHOUT */
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
/* more details.                                                               */
/*                                                                             */
/* You should have received a copy of the GNU General Public License along     */
/* with This program; see the file COPYING.  If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
/*******************************************************************************/

#include "Log_Entry.H"

Log_Entry::Log_Entry ( )
{
    _sa = (char**)malloc( sizeof( char * ) );
    *_sa = NULL;
    _i = 0;
}

Log_Entry::Log_Entry ( char **sa )
{
    _sa = sa;
    _i = 0;

    if ( _sa )
        while ( _sa[ _i ] ) ++_i;

}

Log_Entry::Log_Entry ( const char *s )
{
    _i = 0;
    _sa = s ? parse_alist( s ) : NULL;

    if ( _sa )
        while ( _sa[ _i ] ) ++_i;
}

Log_Entry::~Log_Entry ( )
{
    if ( ! _sa )
        return;

    for ( _i = 0; _sa[ _i ]; ++_i )
    {
        free( _sa[ _i ] );
    }

    free( _sa );
}


/** remove escapes from string /s/ in-place */
static void
unescape ( char *s )
{
    char *r = s;
    for ( ; *s; s++, r++ )
    {
        if ( '\\' == *s )
        {
            switch ( *(++s) )
            {
                case 'n':
                    *r = '\n';
                    break;
                case '"':
                    *r = '"';
                    break;
                default:
                    break;
            }
        }
        else
            *r = *s;
    }

    *r = '\0';
}

/** sigh. parse a string of ":name value :name value" pairs into an
 * array of strings, one per pair */
// FIXME: doesn't handle the case of :name ":foo bar", nested quotes
// or other things it should.
char **
Log_Entry::parse_alist( const char *s )
{

// FIXME: bogus over allocation...

    int tl = strlen( s );
    char **r = (char**)malloc( sizeof( char* ) * tl );

//    const char *e = s + tl;

    const char *c = NULL;
    int i = 0;
    for ( ; ; s++ )
    {

/*         if ( *s == '\n' ) */
/*             break; */

//        if ( *s == ':' || s == e )
        if ( *s == ':' || *s == '\0' )
        {
            if ( c )
            {
                int l = s - c;

                char *pair = (char*)malloc( l + 1 );

                /* remove trailing space */
                if ( c[ l  - 1 ] == ' ' )
                    --l;

                strncpy( pair, c, l );

                pair[ l ] = '\0';

                r[ i++ ] = pair;

                /* split */

                strtok( pair, " " );

                /* remove quotes */
                char *v = pair + strlen( pair ) + 1;

                unescape( v );

                if  ( *v == '"' )
                {
//                    v++;
                    if ( v[ strlen( v ) - 1 ] != '"' )
                        WARNING( "invalid quoting in log entry!" );
                    else
                    {
                        v[ strlen( v ) - 1 ] = '\0';
                        memmove( v, v + 1, strlen( v ) + 1 );
                    }
                }
            }

            c = s;

            if ( *s == '\0' )
                break;
        }
    }

    r[ i ] = NULL;

    return r;
}

/** compare elements of dumps s1 and s2, removing those elements
    of dst which are not changed from src */
bool
Log_Entry::log_diff (  char **sa1, char **sa2 )
{
    if ( ! sa1 )
        return true;

    int w = 0;
    for ( int i = 0; sa1[ i ]; ++i )
    {
        const char *v1 = sa1[ i ] + strlen( sa1[ i ] ) + 1;
        const char *v2 = sa2[ i ] + strlen( sa2[ i ] ) + 1;

        if ( ! strcmp( sa1[ i ], sa2[ i ] ) && ! strcmp( v1, v2 ) )
        {
            free( sa2[ i ] );
            free( sa1[ i ] );
        }
        else
        {
            sa2[ w ] = sa2[ i ];
            sa1[ w ] = sa1[ i ];

            w++;
        }
    }

    sa1[ w ] = NULL;
    sa2[ w ] = NULL;

    return w == 0 ? false : true;
}

bool
Log_Entry::operator!= ( const Log_Entry &rhs ) const
{
    return log_diff( this->_sa, rhs._sa );
}

void
Log_Entry::grow (  )
{
    _sa = (char**)realloc( _sa, sizeof( char * ) * (_i + 2) );
    _sa[ _i + 1 ] = NULL;
}

int
Log_Entry::size ( void ) const
{
    return _i;
}

void
Log_Entry::get ( int n, const char **name, const char **value ) const
{
    *name = _sa[ n ];
    *value = *name + strlen( *name ) + 1;
}


char **
Log_Entry::sa ( void )
{
    return _sa;

/*   char **sa = _sa; */

/* //    _sa = NULL; */

/*     return sa; */
/* } */

}