static void tidy_load_file(const char* file)
{
int fd = rb->open(file, O_RDONLY);
char buf[MAX_PATH], *str, *remove;
char last_group[MAX_PATH] = "";
if (fd < 0)
return;
while ((tidy_type_count < sizeof(tidy_types) / sizeof(tidy_types[0])) && rb->read_line(fd, buf, MAX_PATH))
{
if (!rb->settings_parseline(buf, &str, &remove))
continue;
if (*str == '\\') /* escape first character ? */
str++;
unsigned i = find_file_string(str, last_group);
tidy_types[i].remove = rb->strcmp(remove, "yes");
if (i >= tidy_type_count)
{
i = tidy_type_count;
add_item(str, i);
tidy_type_count++;
}
if (str[0] == '<')
rb->strcpy(last_group, str);
}
rb->close(fd);
}
static ssize_t mychardrv_write (struct file * f, const char __user * address,
size_t size, loff_t * offset)
{
struct strings_representation * sr = f->private_data;
ssize_t res = 0;
long result;
struct file_string * fstr = find_file_string(f);
if (fstr ==NULL) {
// add a new string
fstr = kzalloc(sizeof(struct file_string), GFP_USER);
if (fstr == NULL) {
res = -ENOMEM;
goto error;
}
fstr->string = kzalloc(size, GFP_USER);
if (fstr->string==NULL) {
kfree (fstr);
res = -ENOMEM;
goto error;
}
fstr->id = sr->current_id;
fstr->next = sr->next;
sr->next = fstr;
}
else {
char * tmp = kzalloc(size, GFP_USER);
if (tmp==NULL) {
res = -ENOMEM;
goto error;
}
kfree (fstr->string);
fstr->string = tmp;
}
result = probe_kernel_read(fstr->string, address, size);
printk (KERN_DEBUG "probe_kernel_write returns %ld\n", result);
res = result;
if (result < 0) {
printk (KERN_DEBUG "string is nullified\n");
fstr->string = NULL;
goto error;
}
res = copy_from_user(fstr->string, address, size);
if (res == 0) {
printk(KERN_DEBUG "copied %ld bytes from the user at offset %ld\n", size, offset);
res = size;
*offset += size;
}
else {
printk(KERN_DEBUG "error: %ld bytes could not be copied from user at offset %ld\n", res, offset);
res = (ssize_t) -EFAULT;
}
error:
return res;
}
static ssize_t mychardrv_read(struct file * f, char __user * address,
size_t size, loff_t * offset)
{
ssize_t res = 0;
ssize_t copy_size;
struct file_string * fstr = find_file_string(f);
printk(KERN_DEBUG "device read to user address %p\n", address);
printk(KERN_DEBUG " requested size %ld bytes\n", size);
if (offset==NULL)
printk(KERN_DEBUG " current file offset not provided (NULL)\n");
else
printk(KERN_DEBUG " current file offset %lld\n", *offset);
if (fstr!=NULL) {
if (fstr->string!=NULL) {
copy_size = min(size, strlen(fstr->string)+1);
res = copy_to_user (address, fstr->string, copy_size);
if (res == 0)
printk(KERN_DEBUG "copied %ld bytes to the user\n", copy_size);
else {
printk(KERN_DEBUG "error: %ld bytes could not be copied to user\n", res);
copy_size = (ssize_t) -EFAULT;
}
}
else {
copy_size = 0;
}
}
else if (size < sizeof (num_opens)) copy_size = (ssize_t) -ENOBUFS;
else {
// implementation, copy the num_opens number into the user buffer
copy_size = sizeof(num_opens);
res = copy_to_user (address, &num_opens, copy_size);
if (res == 0)
printk(KERN_DEBUG "copied %ld bytes to the user\n", copy_size);
else {
printk(KERN_DEBUG "error: %ld bytes could not be copied to user\n", res);
copy_size = (ssize_t) -EFAULT;
}
}
return copy_size;
}