logprint.c

Android 一些工具

            eventDataLen -= strLen;
            break;
        }
    case EVENT_TYPE_LIST:
        /* N items, all different types */
        {
            unsigned char count;
            int i;

            if (eventDataLen < 1)
                return -1;

            count = *eventData++;
            eventDataLen--;

            if (outBufLen > 0) {
                *outBuf++ = '[';
                outBufLen--;
            } else {
                goto no_room;
            }

            for (i = 0; i < count; i++) {
                result = android_log_printBinaryEvent(&eventData, &eventDataLen,
                        &outBuf, &outBufLen);
                if (result != 0)
                    goto bail;

                if (i < count-1) {
                    if (outBufLen > 0) {
                        *outBuf++ = ',';
                        outBufLen--;
                    } else {
                        goto no_room;
                    }
                }
            }

            if (outBufLen > 0) {
                *outBuf++ = ']';
                outBufLen--;
            } else {
                goto no_room;
            }
        }
        break;
    default:
        fprintf(stderr, "Unknown binary event type %d\n", type);
        return -1;
    }

bail:
    *pEventData = eventData;
    *pEventDataLen = eventDataLen;
    *pOutBuf = outBuf;
    *pOutBufLen = outBufLen;
    return result;

no_room:
    result = 1;
    goto bail;
}

/**
 * Convert a binary log entry to ASCII form.
 *
 * For convenience we mimic the processLogBuffer API.  There is no
 * pre-defined output length for the binary data, since we're free to format
 * it however we choose, which means we can't really use a fixed-size buffer
 * here.
 */
int android_log_processBinaryLogBuffer(struct logger_entry *buf,
    AndroidLogEntry *entry, const EventTagMap* map, char* messageBuf,
    int messageBufLen)
{
    size_t inCount;
    unsigned int tagIndex;
    const unsigned char* eventData;

    entry->tv_sec = buf->sec;
    entry->tv_nsec = buf->nsec;
    entry->priority = ANDROID_LOG_INFO;
    entry->pid = buf->pid;
    entry->tid = buf->tid;

    /*
     * Pull the tag out.
     */
    eventData = (const unsigned char*) buf->msg;
    inCount = buf->len;
    if (inCount < 4)
        return -1;
    tagIndex = get4LE(eventData);
    eventData += 4;
    inCount -= 4;

    if (map != NULL) {
        entry->tag = android_lookupEventTag(map, tagIndex);
    } else {
        entry->tag = NULL;
    }

    /*
     * If we don't have a map, or didn't find the tag number in the map,
     * stuff a generated tag value into the start of the output buffer and
     * shift the buffer pointers down.
     */
    if (entry->tag == NULL) {
        int tagLen;

        tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
        entry->tag = messageBuf;
        messageBuf += tagLen+1;
        messageBufLen -= tagLen+1;
    }

    /*
     * Format the event log data into the buffer.
     */
    char* outBuf = messageBuf;
    size_t outRemaining = messageBufLen-1;      /* leave one for nul byte */
    int result;
    result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
                &outRemaining);
    if (result < 0) {
        fprintf(stderr, "Binary log entry conversion failed\n");
        return -1;
    } else if (result == 1) {
        if (outBuf > messageBuf) {
            /* leave an indicator */
            *(outBuf-1) = '!';
        } else {
            /* no room to output anything at all */
            *outBuf++ = '!';
            outRemaining--;
        }
        /* pretend we ate all the data */
        inCount = 0;
    }

    /* eat the silly terminating '\n' */
    if (inCount == 1 && *eventData == '\n') {
        eventData++;
        inCount--;
    }

    if (inCount != 0) {
        fprintf(stderr,
            "Warning: leftover binary log data (%d bytes)\n", inCount);
    }

    /*
     * Terminate the buffer.  The NUL byte does not count as part of
     * entry->messageLen.
     */
    *outBuf = '\0';
    entry->messageLen = outBuf - messageBuf;
    assert(entry->messageLen == (messageBufLen-1) - outRemaining);

    entry->message = messageBuf;

    return 0;
}

/**
 * Formats a log message into a buffer
 *
 * Uses defaultBuffer if it can, otherwise malloc()'s a new buffer
 * If return value != defaultBuffer, caller must call free()
 * Returns NULL on malloc error
 */

char *android_log_formatLogLine (
    AndroidLogFormat *p_format,
    char *defaultBuffer,
    size_t defaultBufferSize,
    const AndroidLogEntry *entry,
    size_t *p_outLength)
{
#if defined(HAVE_LOCALTIME_R)
    struct tm tmBuf;
#endif
    struct tm* ptm;
    char timeBuf[32];
    char headerBuf[128];
    char prefixBuf[128], suffixBuf[128];
    char priChar;
    int prefixSuffixIsHeaderFooter = 0;
    char * ret = NULL;

    priChar = filterPriToChar(entry->priority);

    /*
     * Get the current date/time in pretty form
     *
     * It's often useful when examining a log with "less" to jump to
     * a specific point in the file by searching for the date/time stamp.
     * For this reason it's very annoying to have regexp meta characters
     * in the time stamp.  Don't use forward slashes, parenthesis,
     * brackets, asterisks, or other special chars here.
     */
#if defined(HAVE_LOCALTIME_R)
    ptm = localtime_r(&(entry->tv_sec), &tmBuf);
#else
    ptm = localtime(&(entry->tv_sec));
#endif
    //strftime(timeBuf, sizeof(timeBuf), "%Y-%m-%d %H:%M:%S", ptm);
    strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);

    /*
     * Construct a buffer containing the log header and log message.
     */
    size_t prefixLen, suffixLen;

    switch (p_format->format) {
        case FORMAT_TAG:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%c/%-8s: ", priChar, entry->tag);
            strcpy(suffixBuf, "\n"); suffixLen = 1;
            break;
        case FORMAT_PROCESS:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%c(%5d) ", priChar, entry->pid);
            suffixLen = snprintf(suffixBuf, sizeof(suffixBuf),
                "  (%s)\n", entry->tag);
            break;
        case FORMAT_THREAD:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%c(%5d:%p) ", priChar, entry->pid, (void*)entry->tid);
            strcpy(suffixBuf, "\n");
            suffixLen = 1;
            break;
        case FORMAT_RAW:
            prefixBuf[0] = 0;
            prefixLen = 0;
            strcpy(suffixBuf, "\n");
            suffixLen = 1;
            break;
        case FORMAT_TIME:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%s.%03ld %c/%-8s(%5d): ", timeBuf, entry->tv_nsec / 1000000,
                priChar, entry->tag, entry->pid);
            strcpy(suffixBuf, "\n");
            suffixLen = 1;
            break;
        case FORMAT_THREADTIME:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%s.%03ld %5d %5d %c %-8s: ", timeBuf, entry->tv_nsec / 1000000,
                (int)entry->pid, (int)entry->tid, priChar, entry->tag);
            strcpy(suffixBuf, "\n");
            suffixLen = 1;
            break;
        case FORMAT_LONG:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "[ %s.%03ld %5d:%p %c/%-8s ]\n",
                timeBuf, entry->tv_nsec / 1000000, entry->pid,
                (void*)entry->tid, priChar, entry->tag);
            strcpy(suffixBuf, "\n\n");
            suffixLen = 2;
            prefixSuffixIsHeaderFooter = 1;
            break;
        case FORMAT_BRIEF:
        default:
            prefixLen = snprintf(prefixBuf, sizeof(prefixBuf),
                "%c/%-8s(%5d): ", priChar, entry->tag, entry->pid);
            strcpy(suffixBuf, "\n");
            suffixLen = 1;
            break;
    }

    /* the following code is tragically unreadable */

    size_t numLines;
    size_t i;
    char *p;
    size_t bufferSize;
    const char *pm;

    if (prefixSuffixIsHeaderFooter) {
        // we're just wrapping message with a header/footer
        numLines = 1;
    } else {
        pm = entry->message;
        numLines = 0;

        // The line-end finding here must match the line-end finding
        // in for ( ... numLines...) loop below
        while (pm < (entry->message + entry->messageLen)) {
            if (*pm++ == '\n') numLines++;
        }
        // plus one line for anything not newline-terminated at the end
        if (pm > entry->message && *(pm-1) != '\n') numLines++;
    }

    // this is an upper bound--newlines in message may be counted
    // extraneously
    bufferSize = (numLines * (prefixLen + suffixLen)) + entry->messageLen + 1;

    if (defaultBufferSize >= bufferSize) {
        ret = defaultBuffer;
    } else {
        ret = (char *)malloc(bufferSize);

        if (ret == NULL) {
            return ret;
        }
    }

    ret[0] = '\0';       /* to start strcat off */

    p = ret;
    pm = entry->message;

    if (prefixSuffixIsHeaderFooter) {
        strcat(p, prefixBuf);
        p += prefixLen;
        strncat(p, entry->message, entry->messageLen);
        p += entry->messageLen;
        strcat(p, suffixBuf);
        p += suffixLen;
    } else {
        while(pm < (entry->message + entry->messageLen)) {
            const char *lineStart;
            size_t lineLen;

            lineStart = pm;

            // Find the next end-of-line in message
            while (pm < (entry->message + entry->messageLen)
                    && *pm != '\n') pm++;
            lineLen = pm - lineStart;

            strcat(p, prefixBuf);
            p += prefixLen;
            strncat(p, lineStart, lineLen);
            p += lineLen;
            strcat(p, suffixBuf);
            p += suffixLen;

            if (*pm == '\n') pm++;
        }
    }

    if (p_outLength != NULL) {
        *p_outLength = p - ret;
    }

    return ret;
}

/**
 * Either print or do not print log line, based on filter
 *
 * Returns count bytes written
 */

int android_log_filterAndPrintLogLine(
    AndroidLogFormat *p_format,
    int fd,
    const AndroidLogEntry *entry)
{
    int ret;
    char defaultBuffer[512];
    char *outBuffer = NULL;
    size_t totalLen;

    if (0 == android_log_shouldPrintLine(p_format, entry->tag,
            entry->priority)) {
        return 0;
    }

    outBuffer = android_log_formatLogLine(p_format, defaultBuffer,
            sizeof(defaultBuffer), entry, &totalLen);

    if (!outBuffer)
        return -1;

    do {
        ret = write(fd, outBuffer, totalLen);
    } while (ret < 0 && errno == EINTR);

    if (ret < 0) {
        fprintf(stderr, "+++ LOG: write failed (errno=%d)\n", errno);
        ret = 0;
        goto done;
    }

    if (((size_t)ret) < totalLen) {
        fprintf(stderr, "+++ LOG: write partial (%d of %d)\n", ret,
                (int)totalLen);
        goto done;
    }

done:
    if (outBuffer != defaultBuffer) {
        free(outBuffer);
    }

    return ret;
}



void logprint_run_tests()
{
#if 0

    fprintf(stderr, "tests disabled\n");

#else

    int err;
    const char *tag;
    AndroidLogFormat *p_format;

    p_format = android_log_format_new();

    fprintf(stderr, "running tests\n");

    tag = "random";

    android_log_addFilterRule(p_format,"*:i");

    assert (ANDROID_LOG_INFO == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) == 0);
    android_log_addFilterRule(p_format, "*");
    assert (ANDROID_LOG_DEBUG == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) > 0);
    android_log_addFilterRule(p_format, "*:v");
    assert (ANDROID_LOG_VERBOSE == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) > 0);
    android_log_addFilterRule(p_format, "*:i");
    assert (ANDROID_LOG_INFO == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) == 0);

    android_log_addFilterRule(p_format, "random");
    assert (ANDROID_LOG_VERBOSE == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) > 0);
    android_log_addFilterRule(p_format, "random:v");
    assert (ANDROID_LOG_VERBOSE == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) > 0);
    android_log_addFilterRule(p_format, "random:d");
    assert (ANDROID_LOG_DEBUG == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) > 0);
    android_log_addFilterRule(p_format, "random:w");
    assert (ANDROID_LOG_WARN == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) == 0);

    android_log_addFilterRule(p_format, "crap:*");
    assert (ANDROID_LOG_VERBOSE== filterPriForTag(p_format, "crap"));
    assert(android_log_shouldPrintLine(p_format, "crap", ANDROID_LOG_VERBOSE) > 0);

    // invalid expression
    err = android_log_addFilterRule(p_format, "random:z");
    assert (err < 0);
    assert (ANDROID_LOG_WARN == filterPriForTag(p_format, "random"));
    assert(android_log_shouldPrintLine(p_format, tag, ANDROID_LOG_DEBUG) == 0);

    // Issue #550946
    err = android_log_addFilterString(p_format, " ");
    assert(err == 0);
    assert(ANDROID_LOG_WARN == filterPriForTag(p_format, "random"));

    // note trailing space
    err = android_log_addFilterString(p_format, "*:s random:d ");
    assert(err == 0);
    assert(ANDROID_LOG_DEBUG == filterPriForTag(p_format, "random"));

    err = android_log_addFilterString(p_format, "*:s random:z");
    assert(err < 0);


#if 0
    char *ret;
    char defaultBuffer[512];

    ret = android_log_formatLogLine(p_format,
        defaultBuffer, sizeof(defaultBuffer), 0, ANDROID_LOG_ERROR, 123,
        123, 123, "random", "nofile", strlen("Hello"), "Hello", NULL);
#endif


    fprintf(stderr, "tests complete\n");
#endif
}