mirror of https://github.com/ArduPilot/ardupilot
119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
// 2 or 3 structures, select one that is before target point, closest to target
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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ArduPilot filesystem interface for system information
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*/
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#include "AP_Filesystem.h"
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#include "AP_Filesystem_Sys.h"
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#include <AP_Math/AP_Math.h>
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extern const AP_HAL::HAL& hal;
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int AP_Filesystem_Sys::open(const char *fname, int flags)
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{
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if ((flags & O_ACCMODE) != O_RDONLY) {
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errno = EROFS;
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return -1;
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}
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uint8_t idx;
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for (idx=0; idx<max_open_file; idx++) {
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if (!file[idx].open) {
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break;
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}
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}
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if (idx == max_open_file) {
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errno = ENFILE;
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return -1;
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}
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struct rfile &r = file[idx];
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r.data = new file_data;
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if (r.data == nullptr) {
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errno = ENOMEM;
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return -1;
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}
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if (strcmp(fname, "threads.txt") == 0) {
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const uint32_t max_size = 1024;
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r.data->data = (char *)malloc(max_size);
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if (r.data->data) {
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r.data->length = hal.util->thread_info(r.data->data, max_size);
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}
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}
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if (r.data->data == nullptr) {
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delete r.data;
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errno = ENOENT;
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return -1;
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}
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r.file_ofs = 0;
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r.open = true;
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return idx;
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}
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int AP_Filesystem_Sys::close(int fd)
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{
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if (fd < 0 || fd >= max_open_file || !file[fd].open) {
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errno = EBADF;
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return -1;
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}
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struct rfile &r = file[fd];
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r.open = false;
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free(r.data->data);
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delete r.data;
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return 0;
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}
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int32_t AP_Filesystem_Sys::read(int fd, void *buf, uint32_t count)
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{
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if (fd < 0 || fd >= max_open_file || !file[fd].open) {
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errno = EBADF;
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return -1;
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}
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struct rfile &r = file[fd];
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count = MIN(count, r.data->length - r.file_ofs);
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memcpy(buf, &r.data->data[r.file_ofs], count);
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r.file_ofs += count;
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return count;
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}
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int32_t AP_Filesystem_Sys::lseek(int fd, int32_t offset, int seek_from)
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{
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if (fd < 0 || fd >= max_open_file || !file[fd].open) {
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errno = EBADF;
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return -1;
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}
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struct rfile &r = file[fd];
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switch (seek_from) {
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case SEEK_SET:
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r.file_ofs = MIN(offset, int32_t(r.data->length));
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break;
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case SEEK_CUR:
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r.file_ofs = MIN(r.data->length, offset+r.file_ofs);
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break;
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case SEEK_END:
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errno = EINVAL;
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return -1;
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}
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return r.file_ofs;
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}
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int AP_Filesystem_Sys::stat(const char *name, struct stat *stbuf)
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{
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memset(stbuf, 0, sizeof(*stbuf));
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// give fixed size, EOF on read gives real size
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stbuf->st_size = 1024*1024;
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return 0;
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}
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