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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef UTIL_H
#define UTIL_H
#include "common/scummsys.h"
/* An excercise in bloated macro writing ;-)*/
/*Declare a flexarray type*/
#define FLEXARRAY(type, extra) struct{\
type* data;\
int used, size, itemsize;\
extra\
}
/* [DJ] Declare a flexarray type without extra fields - Visual C++ complains
** when the FLEXARRAY macro is used and extra parameter is not specified
*/
#define FLEXARRAY_NOEXTRA(type) struct{\
type* data;\
int used, size, itemsize;\
}
/*Initialize a flexarray*/
#define FLEXARRAY_INIT(type, array) do {(array).itemsize=sizeof(type); (array).size=0; (array).used=0;} while(0)
/*Prints an error message and returns (from the function using the macro)*/
#define FLEXARRAY_PANIC(message, errorcode) do{\
fprintf message;\
errorcode;\
} while(0)
/*Use if the state of the array is incnsistent*/
#define FLEXARRAY_PANIC_BADSTATE(array, errorcode) FLEXARRAY_PANIC((stderr, "PANIC: flexarray "#array" is in an inconsistent state (%d,%d).\n", (array).used, (array).size), errorcode)
/*Use if memory allocation fails*/
#define FLEXARRAY_PANIC_MEMORY(array, bytes, errorcode) FLEXARRAY_PANIC((stderr, "PANIC: Unable to allocate %d bytes for flexarray"#array"\n", bytes), errorcode)
/*Allocates an initial array*/
#define FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode) do{\
(array).data= (type*)sci_malloc(4*(array).itemsize);\
if((array).data==0) FLEXARRAY_PANIC_MEMORY(array, 4*(array).itemsize, errorcode);\
(array).size=4;\
(array).used=0;\
} while(0)
/*Doubles the size of the allocated area*/
#define FLEXARRAY_RESIZE(type, array, errorcode) do{\
int size=(array).size*2*(array).itemsize;\
(array).data= (type*)sci_realloc((array).data, size);\
if((array).data==0) FLEXARRAY_PANIC_MEMORY(array, size, errorcode);\
(array).size*=2;\
} while(0)
/*Appends /value/ at the end of the array, resizing as necessary*/
#define FLEXARRAY_APPEND(type, array, value, errorcode) do\
{\
if((array).used>=(array).size)\
{\
if((array).size==0) FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode);\
else {\
if((array).used==(array).size) FLEXARRAY_RESIZE(type, array, errorcode);\
else FLEXARRAY_PANIC_BADSTATE(array, errorcode);\
}\
}\
(array).data[(array).used++]=(value);\
}while(0)
/*Adds space for a value at the end of the array, resizing as necessary, but
*does not initialize the value*/
#define FLEXARRAY_ADD_SPACE(type, array, items, errorcode) do{\
if((array).used+items>(array).size)\
{\
if((array).size==0) FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode);\
else if((array).used==(array).size) FLEXARRAY_RESIZE(type, array, errorcode);\
else FLEXARRAY_PANIC_BADSTATE(array, errorcode);\
}\
(array).used++;\
} while(0)
#endif
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