129 lines
2.7 KiB
C
129 lines
2.7 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* tod.c
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* Functions to manipulate the TOD
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* Copyright (C) 2004-2005 Simon Newton
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*/
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#include <stdlib.h>
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#include "tod.h"
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#include "misc.h"
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/*
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* adds a uid to the table of devices
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*/
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int add_tod_uid(tod_t *tod, uint8_t uid[ARTNET_RDM_UID_WIDTH]) {
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uint8_t *addr;
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int size;
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if (tod == NULL)
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return -1;
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if (tod->data == NULL) {
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// malloc
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tod->data = malloc(ARTNET_RDM_UID_WIDTH * ARTNET_TOD_INITIAL_SIZE);
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if (tod->data == NULL) {
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artnet_error_malloc();
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return ARTNET_EMEM;
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}
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tod->length = 1;
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tod->max_length = ARTNET_TOD_INITIAL_SIZE;
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} else if (tod->length == tod->max_length) {
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// realloc
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size = (tod->max_length + ARTNET_TOD_INCREMENT);
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tod->data = realloc(tod->data, size * ARTNET_RDM_UID_WIDTH);
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if (tod->data == NULL) {
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artnet_error_realloc();
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return ARTNET_EMEM;
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}
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tod->max_length = size;
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tod->length++;
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} else {
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tod->length++;
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}
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addr = tod->data + (tod->length-1) * ARTNET_RDM_UID_WIDTH;
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memcpy(addr, uid, ARTNET_RDM_UID_WIDTH);
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return 0;
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}
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/*
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* remove a uid from the table of devices
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*
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*/
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int remove_tod_uid(tod_t *tod, uint8_t uid[ARTNET_RDM_UID_WIDTH]) {
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int i;
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int offset = 0;
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uint8_t *last;
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if (tod == NULL)
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return -1;
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if (tod->data == NULL)
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return -1;
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for (i=0; i < tod->length; i++) {
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offset += ARTNET_RDM_UID_WIDTH;
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if (memcmp(tod->data + offset, uid, ARTNET_RDM_UID_WIDTH) == 0)
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break;
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}
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if (i == tod->length) {
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return -1;
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} else {
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last = tod->data + (tod->length-1) * ARTNET_RDM_UID_WIDTH;
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// copy the last entry over this one
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memcpy(tod->data + offset, last ,ARTNET_RDM_UID_WIDTH);
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tod->length--;
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return 0;
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}
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}
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/*
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* clear the table of devices
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*/
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int flush_tod(tod_t *tod) {
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if (tod == NULL)
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return -1;
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free(tod->data);
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tod->data = NULL;
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tod->length = 0;
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tod->max_length = 0;
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return 0;
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}
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int reset_tod(tod_t *tod) {
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if (tod == NULL)
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return -1;
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tod->data = NULL;
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tod->length = 0;
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tod->max_length = 0;
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return 0;
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}
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