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/*
* Copyright (c) 2004 Tama Communications Corporation
*
* This file is part of GNU GLOBAL.
*
* GNU GLOBAL 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, or (at your option)
* any later version.
*
* GNU GLOBAL 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#include <stdio.h>
#include "die.h"
#include "varray.h"
/*
Virtual array: usage and memory status
_: allocated but not assigned.
@: assigned but the value is uncertainty.
Function call Memory status
----------------------------------------------------------
(not exist)
vb = varray_open(sizeof(int), 5); ||
int *a = varray_assign(vb, 0, 0); ||
a == NULL
int *a = varray_assign(vb, 0, 1); |@|_|_|_|_| // expand
printf("%d allocated, %d assigned.\n", vb->alloced, vb->length);
"5 allocated, 1 assigned."
v
*a = 3; |3|_|_|_|_|
v
int *a = varray_assign(vb, 3, 1); |3|@|@|@|_|
v
*a = 8; |3|@|@|8|_|
v
int *a = varray_assign(vb, 5, 1); |3|@|@|8|@|@|_|_|_|_| // expand
v
*a = 5; |3|@|@|8|@|5|_|_|_|_|
printf("%d allocated, %d assigned.\n", vb->alloced, vb->length);
"10 allocated, 6 assigned."
// After construction, you can treat it as a C array.
int i, *a = varray_assign(vb, 0, 0);
for (i = 0; i < vb->length; i++)
printf("%d: %d\n", i, a[i]); // a[1], a[2], a[4] is uncertainty.
*/
#define DEFAULT_EXPAND 100
static int debug = 0;
/*
* varray_open: open virtual array.
*
* i) size size of entry
* i) expand expand array size
* if 0 is specified then use DEFAULT_EXPAND.
* r) vb VARRAY structure
*/
VARRAY *
varray_open(size, expand)
int size;
int expand;
{
VARRAY *vb = (VARRAY *)malloc(sizeof(VARRAY));
if (vb == NULL)
die("short of memory.");
if (size < 1)
die("varray_open: size < 1.");
if (expand < 0)
die("varray_open: expand < 0.");
vb->size = size;
vb->alloced = vb->length = 0;
vb->expand = (expand == 0) ? DEFAULT_EXPAND : expand;
vb->vbuf = NULL;
return vb;
}
/*
* varray_assign: assign varray entry.
*
* i) vb VARRAY structure
* i) index index
* i) force if entry not found, create it.
* r) pointer of the entry
*
* If specified entry is found then it is returned, else it is allocated
* and returned.
* This procedure doesn't operate the contents of the array.
*/
void *
varray_assign(vb, index, force)
VARRAY *vb;
int index;
int force;
{
if (index < 0)
die("varray_assign: illegal index value.");
if (index >= vb->length) {
if (force)
vb->length = index + 1;
else if (index == 0 && vb->length == 0)
return NULL;
else
die("varray_assign: index(=%d) is out of range.", index);
}
/*
* Expand the area.
*/
if (index >= vb->alloced) {
int old_alloced = vb->alloced;
while (index >= vb->alloced)
vb->alloced += vb->expand;
/*
* Old implementations of realloc() may crash
* when a null pointer is passed.
* Therefore, we cannot use realloc(NULL, ...).
*/
if (vb->vbuf == NULL)
vb->vbuf = (char *)malloc(vb->size * vb->alloced);
else
vb->vbuf = (char *)realloc(vb->vbuf, vb->size * vb->alloced);
if (debug)
fprintf(stderr, "Expanded: from %d to %d.\n", old_alloced, vb->alloced);
}
return (void *)(vb->vbuf + vb->size * index);
}
/*
* varray_append: append varray entry.
*
* i) vb VARRAY structure
* r) pointer of the entry
*
* This procedure doesn't operate the contents of the array.
*/
void *
varray_append(vb)
VARRAY *vb;
{
return varray_assign(vb, vb->length, 1);
}
/*
* varray_reset: reset varray array.
*
* i) vb VARRAY structure
*/
void
varray_reset(vb)
VARRAY *vb;
{
vb->length = 0;
}
/*
* varray_close: close varray array.
*
* i) vb VARRAY structure
*/
void
varray_close(vb)
VARRAY *vb;
{
if (vb) {
if (vb->vbuf)
(void)free(vb->vbuf);
(void)free(vb);
}
}
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