109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/*
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* implement arrays for dc
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*
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* Copyright (C) 1994 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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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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*
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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, you can either send email to this
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* program's author (see below) or write to: The Free Software Foundation,
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* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
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*/
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/* This module is the only one that knows what arrays look like. */
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#include "config.h"
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#include <stdio.h> /* "dc-proto.h" wants this */
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#ifdef HAVE_STDLIB_H
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/* get size_t definition from "almost ANSI" compiling environments. */
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#include <stdlib.h>
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#endif
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#include "dc.h"
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#include "dc-proto.h"
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#include "dc-regdef.h"
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/* what's most useful: quick access or sparse arrays? */
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/* I'll go with sparse arrays for now */
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struct dc_array {
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int Index;
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dc_data value;
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struct dc_array *next;
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};
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typedef struct dc_array dc_array;
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/* I can find no reason not to place arrays in their own namespace... */
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static dc_array *dc_array_register[DC_REGCOUNT];
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/* initialize the arrays to their initial values */
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void
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dc_array_init DC_DECLVOID()
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{
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int i;
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for (i=0; i<DC_REGCOUNT; ++i)
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dc_array_register[i] = NULL;
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}
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/* store value into array_id[Index] */
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void
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dc_array_set DC_DECLARG((array_id, Index, value))
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int array_id DC_DECLSEP
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int Index DC_DECLSEP
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dc_data value DC_DECLEND
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{
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dc_array *cur;
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dc_array *prev=NULL;
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dc_array *newentry;
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array_id = regmap(array_id);
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cur = dc_array_register[array_id];
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while (cur && cur->Index < Index){
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prev = cur;
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cur = cur->next;
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}
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if (cur && cur->Index == Index){
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if (cur->value.dc_type == DC_NUMBER)
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dc_free_num(&cur->value.v.number);
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else if (cur->value.dc_type == DC_STRING)
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dc_free_str(&cur->value.v.string);
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else
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dc_garbage(" in array", array_id);
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cur->value = value;
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}else{
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newentry = dc_malloc(sizeof *newentry);
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newentry->Index = Index;
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newentry->value = value;
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newentry->next = cur;
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if (prev)
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prev->next = newentry;
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else
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dc_array_register[array_id] = newentry;
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}
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}
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/* retrieve a dup of a value from array_id[Index] */
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/* A zero value is returned if the specified value is unintialized. */
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dc_data
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dc_array_get DC_DECLARG((array_id, Index))
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int array_id DC_DECLSEP
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int Index DC_DECLEND
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{
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dc_array *cur;
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for (cur=dc_array_register[regmap(array_id)]; cur; cur=cur->next)
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if (cur->Index == Index)
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return dc_dup(cur->value);
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return dc_int2data(0);
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}
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