ardupilot/libraries/AP_Filesystem/AP_Filesystem_Sys.h

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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "AP_Filesystem_backend.h"
class ExpandingString;
class AP_Filesystem_Sys : public AP_Filesystem_Backend
{
public:
// functions that closely match the equivalent posix calls
int open(const char *fname, int flags, bool allow_absolute_paths = false) override;
int close(int fd) override;
int32_t read(int fd, void *buf, uint32_t count) override;
int32_t lseek(int fd, int32_t offset, int whence) override;
int stat(const char *pathname, struct stat *stbuf) override;
void *opendir(const char *pathname) override;
struct dirent *readdir(void *dirp) override;
int closedir(void *dirp) override;
private:
// only allow up to 4 files at a time
static constexpr uint8_t max_open_file = 4;
int8_t file_in_sysfs(const char *fname);
struct DirReadTracker {
size_t file_offset;
struct dirent curr_file;
};
struct rfile {
bool open;
uint32_t file_ofs;
ExpandingString *str;
} file[max_open_file];
};