int DeviceInfoMmiGet()

in src/modules/deviceinfo/src/lib/DeviceInfo.c [181:320]
125 lines of code
33 McCabe index (conditional complexity)

int DeviceInfoMmiGet(MMI_HANDLE clientSession, const char* componentName, const char* objectName, MMI_JSON_STRING* payload, int* payloadSizeBytes)
{
    int status = MMI_OK;
    char* value = NULL;
    bool isStringValue = true;
    char buffer[10] = {0};

    if ((NULL == componentName) || (NULL == objectName) || (NULL == payload) || (NULL == payloadSizeBytes))
    {
        OsConfigLogError(DeviceInfoGetLog(), "MmiGet(%s, %s, %p, %p) called with invalid arguments", componentName, objectName, payload, payloadSizeBytes);
        status = EINVAL;
        return status;
    }

    *payload = NULL;
    *payloadSizeBytes = 0;

    if (!IsValidSession(clientSession))
    {
        OsConfigLogError(DeviceInfoGetLog(), "MmiGet(%s, %s) called outside of a valid session", componentName, objectName);
        status = EINVAL;
    }

    if ((MMI_OK == status) && (strcmp(componentName, g_deviceInfoComponentName)))
    {
        OsConfigLogError(DeviceInfoGetLog(), "MmiGet called for an unsupported component name (%s)", componentName);
        status = EINVAL;
    }

    if (MMI_OK == status)
    {
        if (0 == strcmp(objectName, g_osNameObject))
        {
            value = g_osName;
        }
        else if (0 == strcmp(objectName, g_osVersionObject))
        {
            value = g_osVersion;
        }
        else if (0 == strcmp(objectName, g_cpuTypeObject))
        {
            value = g_cpuType;
        }
        else if (0 == strcmp(objectName, g_cpuVendorObject))
        {
            value = g_cpuVendor;
        }
        else if (0 == strcmp(objectName, g_cpuModelObject))
        {
            value = g_cpuModel;
        }
        else if (0 == strcmp(objectName, g_totalMemoryObject))
        {
            isStringValue = false;
            snprintf(buffer, sizeof(buffer), "%lu", g_totalMemory);
            value = buffer;
        }
        else if (0 == strcmp(objectName, g_freeMemoryObject))
        {
            // Refresh this one at every MmiGet
            g_freeMemory = GetFreeMemory(DeviceInfoGetLog());

            isStringValue = false;
            snprintf(buffer, sizeof(buffer), "%lu", g_freeMemory);
            value = buffer;
        }
        else if (0 == strcmp(objectName, g_kernelNameObject))
        {
            value = g_kernelName;
        }
        else if (0 == strcmp(objectName, g_kernelReleaseObject))
        {
            value = g_kernelRelease;
        }
        else if (0 == strcmp(objectName, g_kernelVersionObject))
        {
            value = g_kernelVersion;
        }
        else if (0 == strcmp(objectName, g_productVendorObject))
        {
            value = g_productVendor;
        }
        else if (0 == strcmp(objectName, g_productNameObject))
        {
            value = g_productName;
        }
        else if (0 == strcmp(objectName, g_productVersionObject))
        {
            value = g_productVersion;
        }
        else if (0 == strcmp(objectName, g_systemCapabilitiesObject))
        {
            value = g_systemCapabilities;
        }
        else if (0 == strcmp(objectName, g_systemConfigurationObject))
        {
            value = g_systemConfiguration;
        }
        else if (0 == strcmp(objectName, g_osConfigVersionObject))
        {
            value = OSCONFIG_VERSION;
        }
        else
        {
            OsConfigLogError(DeviceInfoGetLog(), "MmiGet called for an unsupported object name (%s)", objectName);
            status = EINVAL;
        }
    }

    if (MMI_OK == status)
    {
        // The string value (can be empty string) is wrapped in "" and is not null terminated
        *payloadSizeBytes = (value ? strlen(value) : 0) + (isStringValue ? 2 : 0);

        if ((g_maxPayloadSizeBytes > 0) && ((unsigned)*payloadSizeBytes > g_maxPayloadSizeBytes))
        {
            OsConfigLogError(DeviceInfoGetLog(), "MmiGet(%s, %s) insufficient maxmimum size (%d bytes) versus data size (%d bytes), reported value will be truncated",
                componentName, objectName, g_maxPayloadSizeBytes, *payloadSizeBytes);

            *payloadSizeBytes = g_maxPayloadSizeBytes;
        }

        *payload = (MMI_JSON_STRING)malloc(*payloadSizeBytes + 1);
        if (*payload)
        {
            // snprintf counts in the null terminator for the target string (terminator that is excluded from payload)
            snprintf(*payload, *payloadSizeBytes + 1, (isStringValue ? "\"%s\"" : "%s"), value ? value : "");
        }
        else
        {
            OsConfigLogError(DeviceInfoGetLog(), "MmiGet: failed to allocate %d bytes", *payloadSizeBytes + 1);
            *payloadSizeBytes = 0;
            status = ENOMEM;
        }
    }

    OsConfigLogDebug(DeviceInfoGetLog(), "MmiGet(%p, %s, %s, %.*s, %d) returning %d", clientSession, componentName, objectName, *payloadSizeBytes, *payload, *payloadSizeBytes, status);

    return status;
}