mmc_card_util.cpp

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#include "pch.h"
 
#if EFI_PROD_CODE && EFI_FILE_LOGGING
 
#include "ff.h"
#include "mmc_card_util.h"
#include "backup_ram.h"
#include "mmc_card.h"
 
#define LOG_INDEX_FILENAME "index.txt"
 
using namespace rusefi::stringutil;
 
// 10 because we want at least 4 character name (is that about TS protocol which we do not use any more?)
#define MIN_FILE_INDEX 10
int logFileIndex = MIN_FILE_INDEX;
 
void incLogFileName(FIL *fd) {
    // clear the memory
    memset(fd, 0, sizeof(FIL));
    // This file has the index for next log file name
    FRESULT ret = f_open(fd, LOG_INDEX_FILENAME, FA_READ);
 
    char data[_MAX_FILLER];
    memset(data, 0, sizeof(data));
 
    if (ret == FR_OK) {
        UINT readed = 0;
        // leave one byte for terminating 0
        ret = f_read(fd, (void*)data, sizeof(data) - 1, &readed);
 
        if (ret != FR_OK) {
            printFatFsError("log index file read", ret);
            logFileIndex = MIN_FILE_INDEX;
        } else {
            efiPrintf("Got content [%s] size %d", data, readed);
            logFileIndex = maxI(MIN_FILE_INDEX, atoi(data));
            if (absI(logFileIndex) == ATOI_ERROR_CODE) {
                logFileIndex = MIN_FILE_INDEX;
            } else {
                // next file would use next file name
                logFileIndex++;
            }
        }
        f_close(fd);
    } else if (ret == FR_NO_FILE) {
        // no index file - this is not an error, just an empty SD
        logFileIndex = MIN_FILE_INDEX;
    } else {
        printFatFsError("log index file open", ret);
        efiPrintf("%s: not found or error: %d", LOG_INDEX_FILENAME, ret);
        logFileIndex = MIN_FILE_INDEX;
    }
 
    // truncate or create new
    ret = f_open(fd, LOG_INDEX_FILENAME, FA_CREATE_ALWAYS | FA_WRITE);
    if (ret == FR_OK) {
        UINT writen = 0;
        size_t len = itoa10(data, logFileIndex) - data;
        ret = f_write(fd, (void*)data, len, &writen);
        if ((ret != FR_OK) || (len != writen)) {
            printFatFsError("log index write", ret);
        }
        f_close(fd);
    } else {
        printFatFsError("log index file write", ret);
    }
 
    efiPrintf("New log file index %d", logFileIndex);
}
 
#endif // EFI_PROD_CODE && EFI_FILE_LOGGING