619 lines
12 KiB
C
619 lines
12 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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#define _LOGGABLE_C
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#include "Loggable.H"
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#undef _LOGABLE_C
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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FILE *Loggable::_fp;
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int Loggable::_log_id = 0;
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int Loggable::_level = 0;
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int Loggable::_undo_index = 1;
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vector <Loggable *> Loggable::_loggables;
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map <string, create_func*> Loggable::_class_map;
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queue <char *> Loggable::_transaction;
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bool
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Loggable::open ( const char *filename )
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{
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FILE *fp;
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if ( ! ( fp = fopen( filename, "a+" ) ) )
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{
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printf( "Could not open log file for writing!" );
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return false;
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}
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/* replay log */
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{
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char buf[BUFSIZ];
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while ( fscanf( fp, "%[^\n]\n", buf ) == 1 )
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{
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if ( ! ( ! strcmp( buf, "{" ) || ! strcmp( buf, "}" ) ) )
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{
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if ( *buf == '\t' )
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do_this( buf + 1, false );
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else
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do_this( buf, false );
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}
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}
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}
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Loggable::_fp = fp;
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return true;
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}
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/** sigh. parse a string of ":name value :name value" pairs into an
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* array of strings, one per pair */
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// FIXME: doesn't handle the case of :name ":foo bar", nested quotes
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// or other things it should. Also, quotes should be removed here, not
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// in client code.
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static
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char **
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parse_alist( const char *s )
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{
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// FIXME: bogus over allocation...
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int tl = strlen( s );
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char **r = (char**)malloc( sizeof( char* ) * tl );
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const char *e = s + tl;
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const char *c = NULL;
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int i = 0;
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for ( ; ; s++ )
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{
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/* if ( *s == '\n' ) */
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/* break; */
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// if ( *s == ':' || s == e )
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if ( *s == ':' || *s == '\0' )
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{
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if ( c )
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{
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int l = s - c;
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char *pair = (char*)malloc( l + 1 );
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/* remove trailing space */
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if ( c[ l - 1 ] == ' ' )
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--l;
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strncpy( pair, c, l );
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pair[ l ] = '\0';
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r[ i++ ] = pair;
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/* split */
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strtok( pair, " " );
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/* remove quotes */
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char *v = pair + strlen( pair ) + 1;
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if ( *v == '"' )
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{
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// v++;
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if ( v[ strlen( v ) - 1 ] != '"' )
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printf( "error: invalid quoting in log entry!\n" );
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else
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{
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v[ strlen( v ) - 1 ] = '\0';
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memmove( v, v + 1, strlen( v ) + 1 );
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}
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}
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}
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c = s;
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if ( *s == '\0' )
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break;
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}
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}
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r[ i ] = NULL;
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return r;
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}
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static
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void free_sa ( char **sa )
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{
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char **a = sa;
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for ( ; *a; a++ )
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free( *a );
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free( sa );
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}
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/** 'do' a message like "Region 0xF1 set :r 123" */
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bool
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Loggable::do_this ( const char *s, bool reverse )
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{
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int id;
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if ( ! ( sscanf( s, "%*s %X ", &id ) > 0 ) )
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return false;
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Loggable *l = find( id );
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// assert( l );
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char classname[40];
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char command[40];
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char *arguments;
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const char *create, *destroy;
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if ( reverse )
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{
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sscanf( s, "%s %*X %s %*[^\n<]<< %a[^\n]", classname, command, &arguments );
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create = "destroy";
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destroy = "create";
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}
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else
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{
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sscanf( s, "%s %*X %s %a[^\n<]", classname, command, &arguments );
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create = "create";
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destroy = "destroy";
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}
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if ( ! strcmp( command, destroy ) )
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{
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/* deleting eg. a track, which contains a list of other
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widgets, causes destroy messages to be emitted for all those
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widgets, but when replaying the journal the destroy message
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causes the children to be deleted also... This is a temporary
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hack. Would it be better to queue up objects for deletion
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(when?) */
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if ( l )
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{
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int id = l->id();
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delete l;
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_loggables[ id ] = NULL;
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}
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}
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else if ( ! strcmp( command, "set" ) )
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{
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// printf( "got set command (%s).\n", arguments );
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char **sa = parse_alist( arguments );
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Log_Entry e( sa );
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l->log_start();
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l->set( e );
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l->log_end();
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}
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else if ( ! strcmp( command, create ) )
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{
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char **sa = NULL;
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if ( arguments )
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sa = parse_alist( arguments );
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Log_Entry e( sa );
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assert( _class_map[ string( classname ) ] );
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/* if ( ! _class_map[ string( classname ) ] ) */
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/* printf( "error class %s is unregistered!\n", classname ); */
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/* else */
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{
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/* create */
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Loggable *l = _class_map[ string( classname ) ]( e );
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l->update_id( id );
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l->log_create();
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}
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}
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return true;
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}
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void
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Loggable::undo ( void )
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{
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char *buf = new char[ BUFSIZ ];
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// fflush( _fp );
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/* FIXME: handle more than the first block!!! */
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fseek( _fp, 0, SEEK_END );
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size_t len = ftell( _fp );
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fseek( _fp, 0 - (BUFSIZ > len ? len : BUFSIZ), SEEK_END );
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len = fread( buf, 1, BUFSIZ, _fp );
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char *s = buf + len - 1;
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int i = 1;
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/* move back _undo_index items from the end */
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for ( int j = _undo_index; j-- ; )
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for ( --s; *s && s >= buf; --s, ++i )
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{
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if ( *s == '\n' )
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{
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if ( *(s + 1) == '\t' )
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continue;
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if ( *(s + 1) == '}' )
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{
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*(s + 1) = NULL;
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continue;
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}
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break;
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}
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}
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s++;
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buf[ len ] = NULL;
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if ( ! strlen( s ) )
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{
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printf( "corrupt undo file or no undo entries.\n" );
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return;
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}
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char *b = s;
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s += strlen( s ) - 1;
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if ( strtok( b, "\n" ) == NULL )
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{
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printf( "error, empty undo transaction!\n" );
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abort();
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}
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int n = 1;
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while ( strtok( NULL, "\n" ) )
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++n;
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int ui = _undo_index;
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block_start();
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if ( strcmp( b, "{" ) )
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{
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/* It's a single undo, get rid of trailing messages in this block */
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n = 1;
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s = b + 2;
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s += strlen( s ) - 1;
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}
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while ( n-- )
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{
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while ( s >= b && *(--s) );
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s++;
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if ( ! strcmp( s, "{" ) )
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break;
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if ( *s == '\t' )
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s++;
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printf( "undoing \"%s\"\n", s );
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do_this( s, true );
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s -= 2;
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}
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block_end();
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_undo_index = ui + 2;
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delete[] buf;
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}
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/** write a snapshot of the state of all loggable objects, sufficient
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* for later reconstruction, to /fp/ */
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bool
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Loggable::snapshot( FILE *fp )
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{
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FILE *ofp = _fp;
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if ( ! ( _fp = fp ) )
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{
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_fp = ofp;
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return false;
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}
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for ( int i = 0; i < _log_id; ++i )
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{
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const Loggable * l = _loggables[ i ];
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if ( l && _class_map[ string( l->class_name() ) ] )
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l->log_create();
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}
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_fp = ofp;
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return true;
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}
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void
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Loggable::compact ( void )
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{
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fseek( _fp, 0, SEEK_SET );
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ftruncate( fileno( _fp ), 0 );
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snapshot( _fp );
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_undo_index = 1;
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}
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void
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Loggable::log ( const char *fmt, ... )
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{
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/* FIXME: bogus limit */
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static char buf[1024];
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static int i = 0;
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va_list args;
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if ( fmt )
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{
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va_start( args, fmt );
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i += vsprintf( buf + i, fmt, args );
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va_end( args );
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}
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if ( rindex( buf, '\n' ) )
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{
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_transaction.push( strdup( buf ) );
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i = 0;
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}
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}
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void
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Loggable::flush ( void )
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{
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if ( ! _fp )
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{
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// printf( "error: no log file open!\n" );
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while ( ! _transaction.empty() )
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{
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free( _transaction.front() );
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_transaction.pop();
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}
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return;
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}
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int n = _transaction.size();
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if ( n )
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/* something done, reset undo index */
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_undo_index = 1;
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if ( n > 1 )
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fprintf( _fp, "{\n" );
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while ( ! _transaction.empty() )
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{
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char *s = _transaction.front();
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_transaction.pop();
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if ( n > 1 )
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fprintf( _fp, "\t" );
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fprintf( _fp, "%s", s );
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free( s );
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}
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if ( n > 1 )
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fprintf( _fp, "}\n" );
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fflush( _fp );
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}
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void
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Loggable::log_print( char **o, char **n ) const
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{
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if ( n )
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for ( ; *n; n++ )
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log( "%s %s%s", *n, *n + strlen( *n ) + 1, *(n + 1) ? " " : "" );
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if ( o && *o )
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{
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if ( n ) log( " << " );
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for ( ; *o; o++ )
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log( "%s %s%s", *o, *o + strlen( *o ) + 1, *(o + 1) ? " " : "" );
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}
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log( "\n" );
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}
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/** compare elements of dumps s1 and s2, removing those elements
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of dst which are not changed from src */
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static
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bool
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log_diff ( char **sa1, char **sa2 )
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{
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if ( ! sa1 )
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return true;
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int w = 0;
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for ( int i = 0; sa1[ i ]; ++i )
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{
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const char *v1 = sa1[ i ] + strlen( sa1[ i ] ) + 1;
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const char *v2 = sa2[ i ] + strlen( sa2[ i ] ) + 1;
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if ( ! strcmp( sa1[ i ], sa2[ i ] ) && ! strcmp( v1, v2 ) )
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{
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free( sa2[ i ] );
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free( sa1[ i ] );
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}
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else
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{
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sa2[ w ] = sa2[ i ];
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sa1[ w ] = sa1[ i ];
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w++;
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}
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}
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sa1[ w ] = NULL;
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sa2[ w ] = NULL;
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return w == 0 ? false : true;
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}
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void
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Loggable::log_start ( void )
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{
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if ( ! _old_state )
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{
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Log_Entry e;
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get( e );
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_old_state = e.sa();
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}
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++_nest;
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}
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void
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Loggable::log_end ( void )
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{
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if ( --_nest > 0 )
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return;
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char **_new_state;
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{
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Log_Entry e;
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get( e );
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_new_state = e.sa();
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}
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if ( log_diff( _old_state, _new_state ) )
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{
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// indent();
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log( "%s 0x%X set ", class_name(), _id );
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log_print( _old_state, _new_state );
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}
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if ( _new_state )
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free_sa( _new_state );
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if ( _old_state )
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free_sa( _old_state );
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_old_state = NULL;
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if ( Loggable::_level == 0 )
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Loggable::flush();
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}
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void
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Loggable::log_create ( void ) const
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{
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// indent();
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/* if ( Loggable::_level ) */
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/* { */
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/* /\* defer until the block ends--this is really only required for capturing... *\/ */
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/* } */
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log( "%s 0x%X create ", class_name(), _id );
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char **sa;
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Log_Entry e;
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get( e );
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sa = e.sa();
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if ( sa )
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{
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log_print( NULL, sa );
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free_sa( sa );
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}
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else
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log( "\n" );
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if ( Loggable::_level == 0 )
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Loggable::flush();
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}
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void
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Loggable::log_destroy ( void ) const
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{
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// indent();
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log( "%s 0x%X destroy (nothing) << ", class_name(), _id );
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char **sa;
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Log_Entry e;
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get( e );
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sa = e.sa();
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// log_print( sa, NULL );
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log_print( NULL, sa );
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free_sa( sa );
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if ( Loggable::_level == 0 )
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Loggable::flush();
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}
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