55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
|
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
||
|
|
* A device that returns "hello world" when read from.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <system.h>
|
||
|
|
#include <fs.h>
|
||
|
|
|
||
|
|
uint32_t read_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
|
||
|
|
uint32_t write_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
|
||
|
|
void open_hello(fs_node_t *node, uint8_t read, uint8_t write);
|
||
|
|
void close_hello(fs_node_t *node);
|
||
|
|
|
||
|
|
char hello[] = "hello world";
|
||
|
|
|
||
|
|
uint32_t read_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
|
||
|
|
uint32_t s = 0;
|
||
|
|
int d = strlen(hello);
|
||
|
|
while (s < size) {
|
||
|
|
buffer[offset] = hello[offset % d];
|
||
|
|
offset++;
|
||
|
|
s++;
|
||
|
|
}
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t write_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
void open_hello(fs_node_t * node, uint8_t read, uint8_t write) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
void close_hello(fs_node_t * node) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
fs_node_t * hello_device_create() {
|
||
|
|
fs_node_t * fnode = malloc(sizeof(fs_node_t));
|
||
|
|
memset(fnode, 0x00, sizeof(fs_node_t));
|
||
|
|
fnode->inode = 0;
|
||
|
|
strcpy(fnode->name, "hello");
|
||
|
|
fnode->uid = 0;
|
||
|
|
fnode->gid = 0;
|
||
|
|
fnode->length = strlen(hello);
|
||
|
|
fnode->flags = FS_CHARDEVICE;
|
||
|
|
fnode->read = read_hello;
|
||
|
|
fnode->write = write_hello;
|
||
|
|
fnode->open = open_hello;
|
||
|
|
fnode->close = close_hello;
|
||
|
|
fnode->readdir = NULL;
|
||
|
|
fnode->finddir = NULL;
|
||
|
|
return fnode;
|
||
|
|
}
|