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/*
* IFD manager
*
* Copyright (C) 2003, Olaf Kirch <okir@suse.de>
*/
#include "internal.h"
#include <string.h>
#include <stdlib.h>
static ifd_reader_t *ifd_readers[OPENCT_MAX_READERS];
static unsigned int ifd_reader_handle = 1;
/*
* Return number of readers available
*/
int ifd_reader_count(void)
{
return OPENCT_MAX_READERS;
}
/*
* Register a reader
*/
int ifd_attach(ifd_reader_t * reader)
{
unsigned int slot;
if (!reader)
return -1;
if (reader->num)
return 0;
for (slot = 0; slot < OPENCT_MAX_READERS; slot++) {
if (!ifd_readers[slot])
break;
}
if (slot >= OPENCT_MAX_READERS) {
ct_error("Too many readers");
return -1;
}
reader->handle = ifd_reader_handle++;
reader->num = slot;
ifd_readers[slot] = reader;
return 0;
}
/*
* Functions to look up registered readers
*/
ifd_reader_t *ifd_reader_by_handle(unsigned int handle)
{
ifd_reader_t *reader;
unsigned int i;
for (i = 0; i < OPENCT_MAX_READERS; i++) {
if ((reader = ifd_readers[i])
&& reader->handle == handle)
return reader;
}
return NULL;
}
ifd_reader_t *ifd_reader_by_index(unsigned int idx)
{
ifd_reader_t *reader;
if (idx >= OPENCT_MAX_READERS) {
ct_error("ifd_reader_by_index: invalid index %u", idx);
return NULL;
}
if (!(reader = ifd_readers[idx]))
return NULL;
return reader;
}
/*
* Unregister a reader
*/
void ifd_detach(ifd_reader_t * reader)
{
unsigned int slot;
if (reader->num == 0)
return;
if ((slot = reader->num) >= OPENCT_MAX_READERS
|| ifd_readers[slot] != reader) {
ct_error("ifd_detach: unknown reader");
return;
}
ifd_readers[slot] = NULL;
}
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