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106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef UTIL_H
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#define UTIL_H
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#include "common/scummsys.h"
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/* An excercise in bloated macro writing ;-)*/
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/*Declare a flexarray type*/
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#define FLEXARRAY(type, extra) struct{\
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type* data;\
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int used, size, itemsize;\
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extra\
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}
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/* [DJ] Declare a flexarray type without extra fields - Visual C++ complains
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** when the FLEXARRAY macro is used and extra parameter is not specified
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*/
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#define FLEXARRAY_NOEXTRA(type) struct{\
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type* data;\
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int used, size, itemsize;\
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}
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/*Initialize a flexarray*/
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#define FLEXARRAY_INIT(type, array) do {(array).itemsize=sizeof(type); (array).size=0; (array).used=0;} while(0)
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/*Prints an error message and returns (from the function using the macro)*/
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#define FLEXARRAY_PANIC(message, errorcode) do{\
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fprintf message;\
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errorcode;\
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} while(0)
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/*Use if the state of the array is incnsistent*/
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#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)
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/*Use if memory allocation fails*/
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#define FLEXARRAY_PANIC_MEMORY(array, bytes, errorcode) FLEXARRAY_PANIC((stderr, "PANIC: Unable to allocate %d bytes for flexarray"#array"\n", bytes), errorcode)
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/*Allocates an initial array*/
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#define FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode) do{\
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(array).data= (type*)sci_malloc(4*(array).itemsize);\
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if((array).data==0) FLEXARRAY_PANIC_MEMORY(array, 4*(array).itemsize, errorcode);\
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(array).size=4;\
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(array).used=0;\
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} while(0)
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/*Doubles the size of the allocated area*/
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#define FLEXARRAY_RESIZE(type, array, errorcode) do{\
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int size=(array).size*2*(array).itemsize;\
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(array).data= (type*)sci_realloc((array).data, size);\
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if((array).data==0) FLEXARRAY_PANIC_MEMORY(array, size, errorcode);\
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(array).size*=2;\
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} while(0)
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/*Appends /value/ at the end of the array, resizing as necessary*/
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#define FLEXARRAY_APPEND(type, array, value, errorcode) do\
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{\
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if((array).used>=(array).size)\
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{\
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if((array).size==0) FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode);\
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else {\
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if((array).used==(array).size) FLEXARRAY_RESIZE(type, array, errorcode);\
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else FLEXARRAY_PANIC_BADSTATE(array, errorcode);\
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}\
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}\
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(array).data[(array).used++]=(value);\
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}while(0)
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/*Adds space for a value at the end of the array, resizing as necessary, but
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*does not initialize the value*/
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#define FLEXARRAY_ADD_SPACE(type, array, items, errorcode) do{\
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if((array).used+items>(array).size)\
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{\
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if((array).size==0) FLEXARRAY_ALLOCATE_INITIAL(type, array, errorcode);\
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else if((array).used==(array).size) FLEXARRAY_RESIZE(type, array, errorcode);\
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else FLEXARRAY_PANIC_BADSTATE(array, errorcode);\
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}\
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(array).used++;\
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} while(0)
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#endif
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