mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-21 13:29:36 +00:00
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
/*
|
|
* hfsutils - tools for reading and writing Macintosh HFS volumes
|
|
* Copyright (C) 1996-1998 Robert Leslie
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id: darray.c,v 1.7 1998/11/02 22:08:26 rob Exp $
|
|
*/
|
|
|
|
# ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
# endif
|
|
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
|
|
# include "darray.h"
|
|
|
|
struct _darray_ {
|
|
char *mem;
|
|
size_t memsz;
|
|
char *eltend;
|
|
size_t elemsz;
|
|
};
|
|
|
|
/*
|
|
* NAME: darray->new()
|
|
* DESCRIPTION: allocate and return a new dynamic array
|
|
*/
|
|
darray *darr_new(size_t elemsz)
|
|
{
|
|
darray *array;
|
|
|
|
array = malloc(sizeof(darray));
|
|
if (array == 0)
|
|
return 0;
|
|
|
|
array->memsz = 8 * elemsz;
|
|
array->mem = malloc(array->memsz);
|
|
if (array->mem == 0)
|
|
{
|
|
free(array);
|
|
return 0;
|
|
}
|
|
|
|
array->eltend = array->mem;
|
|
array->elemsz = elemsz;
|
|
|
|
return array;
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->free()
|
|
* DESCRIPTION: dispose of a dynamic array
|
|
*/
|
|
void darr_free(darray *array)
|
|
{
|
|
free(array->mem);
|
|
free(array);
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->size()
|
|
* DESCRIPTION: return the number of elements in a dynamic array
|
|
*/
|
|
unsigned int darr_size(darray *array)
|
|
{
|
|
return (array->eltend - array->mem) / array->elemsz;
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->array()
|
|
* DESCRIPTION: return the array as an indexable block
|
|
*/
|
|
void *darr_array(darray *array)
|
|
{
|
|
return (void *) array->mem;
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->append()
|
|
* DESCRIPTION: add an element to the end of a dynamic array
|
|
*/
|
|
void *darr_append(darray *array, void *elem)
|
|
{
|
|
char *eltend = array->eltend;
|
|
size_t elemsz = array->elemsz;
|
|
|
|
if ((size_t) (eltend - array->mem) == array->memsz)
|
|
{
|
|
char *newmem;
|
|
size_t newsz;
|
|
|
|
newsz = array->memsz * 2;
|
|
newmem = realloc(array->mem, newsz);
|
|
if (newmem == 0)
|
|
return 0;
|
|
|
|
eltend = newmem + array->memsz;
|
|
|
|
array->mem = newmem;
|
|
array->memsz = newsz;
|
|
}
|
|
|
|
memcpy(eltend, elem, elemsz);
|
|
array->eltend = eltend + elemsz;
|
|
|
|
return eltend;
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->shrink()
|
|
* DESCRIPTION: truncate elements from the end of a dynamic array
|
|
*/
|
|
void darr_shrink(darray *array, unsigned int nelts)
|
|
{
|
|
if (nelts < (array->eltend - array->mem) / array->elemsz)
|
|
array->eltend = array->mem + nelts * array->elemsz;
|
|
}
|
|
|
|
/*
|
|
* NAME: darray->sort()
|
|
* DESCRIPTION: arrange items according to sorting criteria
|
|
*/
|
|
void darr_sort(darray *array, int (*compare)(const void *, const void *))
|
|
{
|
|
qsort(array->mem, (array->eltend - array->mem) / array->elemsz,
|
|
array->elemsz, compare);
|
|
}
|