/**
* open_buffer - function to open a direct-access buffer
* @secondary: secondary address used
*
* This function is called when the computer wants to open a direct
* access buffer (#).
*/
static void open_buffer(uint8_t secondary) {
buffer_t *buf,*prev;
uint8_t count;
if (command_length == 3 && command_buffer[1] == '#') {
/* Open a large buffer */
count = command_buffer[2] - '0';
if (count == 0)
return;
/* Allocate a chain of linked buffers */
buf = alloc_linked_buffers(count);
if (buf == NULL)
return;
do {
buf->secondary = BUFFER_SEC_CHAIN - secondary;
buf->refill = directbuffer_refill;
buf->cleanup = largebuffer_cleanup;
buf->read = 1;
buf->lastused = 255;
stick_buffer(buf);
mark_write_buffer(buf);
prev = buf;
buf = buf->pvt.buffer.next;
} while (buf != NULL);
prev->sendeoi = 1;
buf = prev->pvt.buffer.first;
/* Set the first buffer as active by using the real secondary */
buf->secondary = secondary;
} else {
/* Normal buffer request */
// FIXME: This command can specify a specific buffer number.
buf = alloc_buffer();
if (!buf)
return;
buf->secondary = secondary;
buf->read = 1;
buf->position = 1; /* Sic! */
buf->lastused = 255;
buf->sendeoi = 1;
buf->pvt.buffer.size = 1;
/* directbuffer_refill is used to check for # buffers in iec.c */
buf->refill = directbuffer_refill;
buf->pvt.buffer.first = buf;
mark_write_buffer(buf);
stick_buffer(buf);
}
return;
}
static void eefs_open_write(path_t *path, cbmdirent_t *dent, uint8_t type,
buffer_t *buf, uint8_t append) {
eefs_error_t res;
repad_filename(dent->name);
if (append) {
res = eepromfs_open(dent->name, &buf->pvt.eefh, EEFS_MODE_APPEND);
} else {
res = eepromfs_open(dent->name, &buf->pvt.eefh, EEFS_MODE_WRITE);
}
translate_error(res);
if (res != EEFS_ERROR_OK)
return;
/* set up buffer fields for writing */
mark_write_buffer(buf);
buf->position = 2;
buf->lastused = 2;
buf->data[2] = 0x0d;
buf->refill = eefs_refill_write;
buf->cleanup = eefs_cleanup_write;
}
