datalogging.cpp

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/**
 * @file    datalogging.cpp
 * @brief   Buffered console output stream code
 *
 * Here we have a memory buffer and methods related to
 * printing messages into this buffer. The purpose of the
 * buffer is to allow fast, non-blocking, thread-safe logging.
 *
 * The idea is that each interrupt handler would have it's own logging buffer. You can add
 * stuff into this buffer without any locking since it's you own buffer, and once you get
 * the whole message you invoke the scheduleLogging() method which appends your local content
 * into the global logging buffer, from which it is later dispatched to the console by our
 * main console thread.
 *
 * @date Feb 25, 2013
 * @author Andrey Belomutskiy, (c) 2012-2020
 *
 * This file is part of rusEfi - see http://rusefi.com
 *
 * rusEfi 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.
 *
 * rusEfi 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/>.
 *
 */
 
#include "pch.h"
 
#if ! EFI_UNIT_TEST
 
#include "chmtx.h"
#include "memstreams.h"
#include "console_io.h"
#endif // EFI_UNIT_TEST
 
/**
 * @returns true if data does not fit into this buffer
 */
bool Logging::validateBuffer(uint32_t extraLen) {
    if (remainingSize() < extraLen + 1) {
#if EFI_PROD_CODE
        warning(ObdCode::CUSTOM_LOGGING_BUFFER_OVERFLOW, "output overflow %s %d", name, extraLen);
#endif /* EFI_PROD_CODE */
        return true;
    }
 
    return false;
}
 
void Logging::append(const char *text) {
    efiAssertVoid(ObdCode::CUSTOM_APPEND_NULL, text != NULL, "append NULL");
    uint32_t extraLen = efiStrlen(text);
    bool isCapacityProblem = validateBuffer(extraLen);
    if (isCapacityProblem) {
        return;
    }
    strcpy(linePointer, text);
    /**
     * And now we are pointing at the zero char at the end of the buffer again
     */
    linePointer += extraLen;
}
 
/**
 * @note This method if fast because it does not validate much, be sure what you are doing
 */
void Logging::appendFast(const char *text) {
    char *s = linePointer;
    while ((*s++ = *text++) != 0)
        ;
    linePointer = s - 1;
}
 
void Logging::appendPrintf(const char *fmt, ...) {
    efiAssertVoid(ObdCode::CUSTOM_APPEND_STACK, hasLotsOfRemainingStack(), "lowstck#4");
 
    size_t available = remainingSize();
 
    va_list ap;
    va_start(ap, fmt);
    size_t written = chvsnprintf(linePointer, available, fmt, ap);
    va_end(ap);
 
    // chvnsprintf returns how many bytes WOULD HAVE been written if it fit,
    // so clip it to the available space if necessary
    linePointer += (written > available) ? available : written;
    // ensure buffer is always null terminated
    buffer[bufferSize - 1] = '\0';
}
 
void Logging::appendFloat(float value, int precision) {
    /**
     * todo: #1 this implementation is less than perfect
     * todo: #2 The only way to avoid double promotion would probably be using *float instead of float
     * See also http://stackoverflow.com/questions/5522051/printing-a-float-in-c-while-avoiding-variadic-parameter-promotion-to-double
     */
    switch (precision) {
    case 1:
        appendPrintf("%.1f", value);
        break;
    case 2:
        appendPrintf("%.2f", value);
        break;
    case 3:
        appendPrintf("%.3f", value);
        break;
    case 4:
        appendPrintf("%.4f", value);
        break;
    case 5:
        appendPrintf("%.5f", value);
        break;
    case 6:
        appendPrintf("%.6f", value);
        break;
 
    default:
        appendPrintf("%.2f", value);
    }
}
 
void Logging::reset() {
    linePointer = buffer;
    *linePointer = 0;
}
 
Logging::Logging(char const *p_name, char *p_buffer, int p_bufferSize)
    : name(p_name)
    , buffer(p_buffer)
    , bufferSize(p_bufferSize)
{
    reset();
}
 
LoggingWithStorage::LoggingWithStorage(const char *p_name) : Logging(p_name, DEFAULT_BUFFER, sizeof(DEFAULT_BUFFER))   {
}