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/*
* implement arrays for dc
*
* Copyright (C) 1994, 1997, 1998 Free Software Foundation, Inc.
*
* 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, 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, you can either send email to this
* program's author (see below) or write to: The Free Software Foundation,
* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
*/
/* This module is the only one that knows what arrays look like. */
#include "config.h"
#include <stdio.h> /* "dc-proto.h" wants this */
#ifdef HAVE_STDLIB_H
/* get size_t definition from "almost ANSI" compiling environments. */
#include <stdlib.h>
#endif
#include "dc.h"
#include "dc-proto.h"
#include "dc-regdef.h"
/* what's most useful: quick access or sparse arrays? */
/* I'll go with sparse arrays for now */
struct dc_array {
int Index;
dc_data value;
struct dc_array *next;
};
/* initialize the arrays */
void
dc_array_init DC_DECLVOID()
{
}
/* store value into array_id[Index] */
void
dc_array_set DC_DECLARG((array_id, Index, value))
int array_id DC_DECLSEP
int Index DC_DECLSEP
dc_data value DC_DECLEND
{
struct dc_array *cur;
struct dc_array *prev=NULL;
struct dc_array *newentry;
cur = dc_get_stacked_array(array_id);
while (cur && cur->Index < Index){
prev = cur;
cur = cur->next;
}
if (cur && cur->Index == Index){
if (cur->value.dc_type == DC_NUMBER)
dc_free_num(&cur->value.v.number);
else if (cur->value.dc_type == DC_STRING)
dc_free_str(&cur->value.v.string);
else
dc_garbage(" in array", array_id);
cur->value = value;
}else{
newentry = dc_malloc(sizeof *newentry);
newentry->Index = Index;
newentry->value = value;
newentry->next = cur;
if (prev)
prev->next = newentry;
else
dc_set_stacked_array(array_id, newentry);
}
}
/* retrieve a dup of a value from array_id[Index] */
/* A zero value is returned if the specified value is unintialized. */
dc_data
dc_array_get DC_DECLARG((array_id, Index))
int array_id DC_DECLSEP
int Index DC_DECLEND
{
struct dc_array *cur;
for (cur=dc_get_stacked_array(array_id); cur; cur=cur->next)
if (cur->Index == Index)
return dc_dup(cur->value);
return dc_int2data(0);
}
/* free an array chain */
void
dc_array_free DC_DECLARG((a_head))
struct dc_array *a_head DC_DECLEND
{
struct dc_array *cur;
struct dc_array *next;
for (cur=a_head; cur; cur=next) {
next = cur->next;
if (cur->value.dc_type == DC_NUMBER)
dc_free_num(&cur->value.v.number);
else if (cur->value.dc_type == DC_STRING)
dc_free_str(&cur->value.v.string);
else
dc_garbage("in stack", -1);
free(cur);
}
}
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