/*
start writing to a new log file
*/
uint16_t DataFlash_File::start_new_log(void)
{
stop_logging();
if (_open_error) {
// we have previously failed to open a file - don't try again
// to prevent us trying to open files while in flight
return 0xFFFF;
}
if (_read_fd != -1) {
::close(_read_fd);
_read_fd = -1;
}
uint16_t log_num = find_last_log();
// re-use empty logs if possible
if (_get_log_size(log_num) > 0 || log_num == 0) {
log_num++;
}
if (log_num > MAX_LOG_FILES) {
log_num = 1;
}
char *fname = _log_file_name(log_num);
_write_fd = ::open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (_write_fd == -1) {
_initialised = false;
_open_error = true;
int saved_errno = errno;
::printf("Log open fail for %s - %s\n",
fname, strerror(saved_errno));
hal.console->printf("Log open fail for %s - %s\n",
fname, strerror(saved_errno));
free(fname);
return 0xFFFF;
}
free(fname);
_write_offset = 0;
_writebuf_head = 0;
_writebuf_tail = 0;
log_write_started = true;
// now update lastlog.txt with the new log number
fname = _lastlog_file_name();
FILE *f = ::fopen(fname, "w");
fprintf(f, "%u\r\n", (unsigned)log_num);
fclose(f);
free(fname);
return log_num;
}
// remove all log files
void DataFlash_File::EraseAll()
{
uint16_t log_num;
for (log_num=0; log_num<MAX_LOG_FILES; log_num++) {
char *fname = _log_file_name(log_num);
if (fname == NULL) {
break;
}
unlink(fname);
free(fname);
}
char *fname = _lastlog_file_name();
if (fname != NULL) {
unlink(fname);
free(fname);
}
}
/*
find the highest log number
*/
uint16_t DataFlash_File::find_last_log(void)
{
unsigned ret = 0;
char *fname = _lastlog_file_name();
if (fname == NULL) {
return ret;
}
FILE *f = ::fopen(fname, "r");
free(fname);
if (f != NULL) {
char buf[10];
memset(buf, 0, sizeof(buf));
// PX4 doesn't have fscanf()
if (fread(buf, 1, sizeof(buf)-1, f) > 0) {
sscanf(buf, "%u", &ret);
}
fclose(f);
}
return ret;
}
/*
start writing to a new log file
*/
uint16_t DataFlash_File::start_new_log(void)
{
stop_logging();
if (_read_fd != -1) {
::close(_read_fd);
_read_fd = -1;
}
uint16_t log_num = find_last_log();
// re-use empty logs if possible
if (_get_log_size(log_num) > 0 || log_num == 0) {
log_num++;
}
if (log_num > MAX_LOG_FILES) {
log_num = 1;
}
char *fname = _log_file_name(log_num);
_write_fd = ::open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
free(fname);
if (_write_fd == -1) {
_initialised = false;
return 0xFFFF;
}
_write_offset = 0;
_writebuf_head = 0;
_writebuf_tail = 0;
log_write_started = true;
// now update lastlog.txt with the new log number
fname = _lastlog_file_name();
FILE *f = ::fopen(fname, "w");
fprintf(f, "%u\r\n", (unsigned)log_num);
fclose(f);
free(fname);
return log_num;
}
