static HTTP_HEADERS_RESULT headers_ReplaceHeaderNameValuePair()

in src/httpheaders.c [70:172]
87 lines of code
19 McCabe index (conditional complexity)

static HTTP_HEADERS_RESULT headers_ReplaceHeaderNameValuePair(HTTP_HEADERS_HANDLE handle, const char* name, const char* value, bool replace)
{
    HTTP_HEADERS_RESULT result;
    /*Codes_SRS_HTTP_HEADERS_99_014:[ The function shall return when the handle is not valid or when name parameter is NULL or when value parameter is NULL.]*/
    if (
        (handle == NULL) ||
        (name == NULL) ||
        (value == NULL)
        )
    {
        result = HTTP_HEADERS_INVALID_ARG;
        LogError("invalid arg (NULL) , result= %" PRI_MU_ENUM "", MU_ENUM_VALUE(HTTP_HEADERS_RESULT, result));
    }
    else
    {
        /*Codes_SRS_HTTP_HEADERS_99_036:[ If name contains the characters outside character codes 33 to 126 then the return value shall be HTTP_HEADERS_INVALID_ARG]*/
        /*Codes_SRS_HTTP_HEADERS_99_031:[ If name contains the character ":" then the return value shall be HTTP_HEADERS_INVALID_ARG.]*/
        size_t i;
        size_t nameLen = strlen(name);
        for (i = 0; i < nameLen; i++)
        {
            if ((name[i] < 33) || (126 < name[i]) || (name[i] == ':'))
            {
                break;
            }
        }

        if (i < nameLen)
        {
            result = HTTP_HEADERS_INVALID_ARG;
            LogError("(result = %" PRI_MU_ENUM ")", MU_ENUM_VALUE(HTTP_HEADERS_RESULT, result));
        }
        else
        {
            HTTP_HEADERS_HANDLE_DATA* handleData = (HTTP_HEADERS_HANDLE_DATA*)handle;
            const char* existingValue = Map_GetValueFromKey(handleData->headers, name);
            /*eat up the whitespaces from value, as per RFC 2616, chapter 4.2 "The field value MAY be preceded by any amount of LWS, though a single SP is preferred."*/
            /*Codes_SRS_HTTP_HEADERS_02_002: [The LWS from the beginning of the value shall not be stored.] */
            while ((value[0] == ' ') || (value[0] == '\t') || (value[0] == '\r') || (value[0] == '\n'))
            {
                value++;
            }

            if (!replace && (existingValue != NULL))
            {
                char* newValue;
                size_t existingValueLen = strlen(existingValue);
                size_t valueLen = strlen(value);
                size_t malloc_size = safe_add_size_t(existingValueLen, /*COMMA_AND_SPACE_LENGTH*/ 2);
                malloc_size = safe_add_size_t(malloc_size, valueLen);
                malloc_size = safe_add_size_t(malloc_size, /*EOL*/ 1);
                malloc_size = safe_multiply_size_t(malloc_size, sizeof(char));
                if (malloc_size == SIZE_MAX ||
                    (newValue = (char*)malloc(malloc_size)) == NULL)
                {
                    /*Codes_SRS_HTTP_HEADERS_99_015:[ The function shall return HTTP_HEADERS_ALLOC_FAILED when an internal request to allocate memory fails.]*/
                    result = HTTP_HEADERS_ALLOC_FAILED;
                    LogError("failed to malloc, size= %zu, result= %" PRI_MU_ENUM "", malloc_size, MU_ENUM_VALUE(HTTP_HEADERS_RESULT, result));
                }
                else
                {
                    char* runNewValue;
                    /*Codes_SRS_HTTP_HEADERS_99_017:[ If the name already exists in the collection of headers, the function shall concatenate the new value after the existing value, separated by a comma and a space as in: old-value+", "+new-value.]*/
                    (void)memcpy(newValue, existingValue, existingValueLen);
                    runNewValue = newValue + existingValueLen;
                    (*runNewValue++) = ',';
                    (*runNewValue++) = ' ';
                    (void)memcpy(runNewValue, value, valueLen + /*EOL*/ 1);

                    /*Codes_SRS_HTTP_HEADERS_99_016:[ The function shall store the name:value pair in such a way that when later retrieved by a call to GetHeader it will return a string that shall strcmp equal to the name+": "+value.]*/
                    if (Map_AddOrUpdate(handleData->headers, name, newValue) != MAP_OK)
                    {
                        /*Codes_SRS_HTTP_HEADERS_99_015:[ The function shall return HTTP_HEADERS_ALLOC_FAILED when an internal request to allocate memory fails.]*/
                        result = HTTP_HEADERS_ERROR;
                        LogError("failed to Map_AddOrUpdate, result= %" PRI_MU_ENUM "", MU_ENUM_VALUE(HTTP_HEADERS_RESULT, result));
                    }
                    else
                    {
                        /*Codes_SRS_HTTP_HEADERS_99_013:[ The function shall return HTTP_HEADERS_OK when execution is successful.]*/
                        result = HTTP_HEADERS_OK;
                    }
                    free(newValue);
                }
            }
            else
            {
                /*Codes_SRS_HTTP_HEADERS_99_016:[ The function shall store the name:value pair in such a way that when later retrieved by a call to GetHeader it will return a string that shall strcmp equal to the name+": "+value.]*/
                if (Map_AddOrUpdate(handleData->headers, name, value) != MAP_OK)
                {
                    /*Codes_SRS_HTTP_HEADERS_99_015:[ The function shall return HTTP_HEADERS_ALLOC_FAILED when an internal request to allocate memory fails.]*/
                    result = HTTP_HEADERS_ALLOC_FAILED;
                    LogError("failed to Map_AddOrUpdate, result= %" PRI_MU_ENUM "", MU_ENUM_VALUE(HTTP_HEADERS_RESULT, result));
                }
                else
                {
                    result = HTTP_HEADERS_OK;
                }
            }
        }
    }

    return result;
}