g_spawn.c

quakeIII源码这个不用我多说吧

	newb = G_Alloc( l );

	new_p = newb;

	// turn \n into a real linefeed
	for ( i=0 ; i< l ; i++ ) {
		if (string[i] == '\\' && i < l-1) {
			i++;
			if (string[i] == 'n') {
				*new_p++ = '\n';
			} else {
				*new_p++ = '\\';
			}
		} else {
			*new_p++ = string[i];
		}
	}
	
	return newb;
}




/*
===============
G_ParseField

Takes a key/value pair and sets the binary values
in a gentity
===============
*/
void G_ParseField( const char *key, const char *value, gentity_t *ent ) {
	field_t	*f;
	byte	*b;
	float	v;
	vec3_t	vec;

	for ( f=fields ; f->name ; f++ ) {
		if ( !Q_stricmp(f->name, key) ) {
			// found it
			b = (byte *)ent;

			switch( f->type ) {
			case F_LSTRING:
				*(char **)(b+f->ofs) = G_NewString (value);
				break;
			case F_VECTOR:
				sscanf (value, "%f %f %f", &vec[0], &vec[1], &vec[2]);
				((float *)(b+f->ofs))[0] = vec[0];
				((float *)(b+f->ofs))[1] = vec[1];
				((float *)(b+f->ofs))[2] = vec[2];
				break;
			case F_INT:
				*(int *)(b+f->ofs) = atoi(value);
				break;
			case F_FLOAT:
				*(float *)(b+f->ofs) = atof(value);
				break;
			case F_ANGLEHACK:
				v = atof(value);
				((float *)(b+f->ofs))[0] = 0;
				((float *)(b+f->ofs))[1] = v;
				((float *)(b+f->ofs))[2] = 0;
				break;
			default:
			case F_IGNORE:
				break;
			}
			return;
		}
	}
}




/*
===================
G_SpawnGEntityFromSpawnVars

Spawn an entity and fill in all of the level fields from
level.spawnVars[], then call the class specfic spawn function
===================
*/
void G_SpawnGEntityFromSpawnVars( void ) {
	int			i;
	gentity_t	*ent;
	char		*s, *value, *gametypeName;
	static char *gametypeNames[] = {"ffa", "tournament", "single", "team", "ctf", "oneflag", "obelisk", "harvester", "teamtournament"};

	// get the next free entity
	ent = G_Spawn();

	for ( i = 0 ; i < level.numSpawnVars ; i++ ) {
		G_ParseField( level.spawnVars[i][0], level.spawnVars[i][1], ent );
	}

	// check for "notsingle" flag
	if ( g_gametype.integer == GT_SINGLE_PLAYER ) {
		G_SpawnInt( "notsingle", "0", &i );
		if ( i ) {
			G_FreeEntity( ent );
			return;
		}
	}
	// check for "notteam" flag (GT_FFA, GT_TOURNAMENT, GT_SINGLE_PLAYER)
	if ( g_gametype.integer >= GT_TEAM ) {
		G_SpawnInt( "notteam", "0", &i );
		if ( i ) {
			G_FreeEntity( ent );
			return;
		}
	} else {
		G_SpawnInt( "notfree", "0", &i );
		if ( i ) {
			G_FreeEntity( ent );
			return;
		}
	}

#ifdef MISSIONPACK
	G_SpawnInt( "notta", "0", &i );
	if ( i ) {
		G_FreeEntity( ent );
		return;
	}
#else
	G_SpawnInt( "notq3a", "0", &i );
	if ( i ) {
		G_FreeEntity( ent );
		return;
	}
#endif

	if( G_SpawnString( "gametype", NULL, &value ) ) {
		if( g_gametype.integer >= GT_FFA && g_gametype.integer < GT_MAX_GAME_TYPE ) {
			gametypeName = gametypeNames[g_gametype.integer];

			s = strstr( value, gametypeName );
			if( !s ) {
				G_FreeEntity( ent );
				return;
			}
		}
	}

	// move editor origin to pos
	VectorCopy( ent->s.origin, ent->s.pos.trBase );
	VectorCopy( ent->s.origin, ent->r.currentOrigin );

	// if we didn't get a classname, don't bother spawning anything
	if ( !G_CallSpawn( ent ) ) {
		G_FreeEntity( ent );
	}
}



/*
====================
G_AddSpawnVarToken
====================
*/
char *G_AddSpawnVarToken( const char *string ) {
	int		l;
	char	*dest;

	l = strlen( string );
	if ( level.numSpawnVarChars + l + 1 > MAX_SPAWN_VARS_CHARS ) {
		G_Error( "G_AddSpawnVarToken: MAX_SPAWN_CHARS" );
	}

	dest = level.spawnVarChars + level.numSpawnVarChars;
	memcpy( dest, string, l+1 );

	level.numSpawnVarChars += l + 1;

	return dest;
}

/*
====================
G_ParseSpawnVars

Parses a brace bounded set of key / value pairs out of the
level's entity strings into level.spawnVars[]

This does not actually spawn an entity.
====================
*/
qboolean G_ParseSpawnVars( void ) {
	char		keyname[MAX_TOKEN_CHARS];
	char		com_token[MAX_TOKEN_CHARS];

	level.numSpawnVars = 0;
	level.numSpawnVarChars = 0;

	// parse the opening brace
	if ( !trap_GetEntityToken( com_token, sizeof( com_token ) ) ) {
		// end of spawn string
		return qfalse;
	}
	if ( com_token[0] != '{' ) {
		G_Error( "G_ParseSpawnVars: found %s when expecting {",com_token );
	}

	// go through all the key / value pairs
	while ( 1 ) {	
		// parse key
		if ( !trap_GetEntityToken( keyname, sizeof( keyname ) ) ) {
			G_Error( "G_ParseSpawnVars: EOF without closing brace" );
		}

		if ( keyname[0] == '}' ) {
			break;
		}
		
		// parse value	
		if ( !trap_GetEntityToken( com_token, sizeof( com_token ) ) ) {
			G_Error( "G_ParseSpawnVars: EOF without closing brace" );
		}

		if ( com_token[0] == '}' ) {
			G_Error( "G_ParseSpawnVars: closing brace without data" );
		}
		if ( level.numSpawnVars == MAX_SPAWN_VARS ) {
			G_Error( "G_ParseSpawnVars: MAX_SPAWN_VARS" );
		}
		level.spawnVars[ level.numSpawnVars ][0] = G_AddSpawnVarToken( keyname );
		level.spawnVars[ level.numSpawnVars ][1] = G_AddSpawnVarToken( com_token );
		level.numSpawnVars++;
	}

	return qtrue;
}



/*QUAKED worldspawn (0 0 0) ?

Every map should have exactly one worldspawn.
"music"		music wav file
"gravity"	800 is default gravity
"message"	Text to print during connection process
*/
void SP_worldspawn( void ) {
	char	*s;

	G_SpawnString( "classname", "", &s );
	if ( Q_stricmp( s, "worldspawn" ) ) {
		G_Error( "SP_worldspawn: The first entity isn't 'worldspawn'" );
	}

	// make some data visible to connecting client
	trap_SetConfigstring( CS_GAME_VERSION, GAME_VERSION );

	trap_SetConfigstring( CS_LEVEL_START_TIME, va("%i", level.startTime ) );

	G_SpawnString( "music", "", &s );
	trap_SetConfigstring( CS_MUSIC, s );

	G_SpawnString( "message", "", &s );
	trap_SetConfigstring( CS_MESSAGE, s );				// map specific message

	trap_SetConfigstring( CS_MOTD, g_motd.string );		// message of the day

	G_SpawnString( "gravity", "800", &s );
	trap_Cvar_Set( "g_gravity", s );

	G_SpawnString( "enableDust", "0", &s );
	trap_Cvar_Set( "g_enableDust", s );

	G_SpawnString( "enableBreath", "0", &s );
	trap_Cvar_Set( "g_enableBreath", s );

	g_entities[ENTITYNUM_WORLD].s.number = ENTITYNUM_WORLD;
	g_entities[ENTITYNUM_WORLD].classname = "worldspawn";

	// see if we want a warmup time
	trap_SetConfigstring( CS_WARMUP, "" );
	if ( g_restarted.integer ) {
		trap_Cvar_Set( "g_restarted", "0" );
		level.warmupTime = 0;
	} else if ( g_doWarmup.integer ) { // Turn it on
		level.warmupTime = -1;
		trap_SetConfigstring( CS_WARMUP, va("%i", level.warmupTime) );
		G_LogPrintf( "Warmup:\n" );
	}

}


/*
==============
G_SpawnEntitiesFromString

Parses textual entity definitions out of an entstring and spawns gentities.
==============
*/
void G_SpawnEntitiesFromString( void ) {
	// allow calls to G_Spawn*()
	level.spawning = qtrue;
	level.numSpawnVars = 0;

	// the worldspawn is not an actual entity, but it still
	// has a "spawn" function to perform any global setup
	// needed by a level (setting configstrings or cvars, etc)
	if ( !G_ParseSpawnVars() ) {
		G_Error( "SpawnEntities: no entities" );
	}
	SP_worldspawn();

	// parse ents
	while( G_ParseSpawnVars() ) {
		G_SpawnGEntityFromSpawnVars();
	}	

	level.spawning = qfalse;			// any future calls to G_Spawn*() will be errors
}