UUID_FROM_STRING_RESULT uuid_from_string()

in src/uuid_string.c [94:144]

• 35 lines of code
• 12 McCabe index (conditional complexity)

UUID_FROM_STRING_RESULT uuid_from_string(const char* uuid_string, UUID_T uuid) /*uuid_string is not necessarily null terminated*/
{
    UUID_FROM_STRING_RESULT result;

    if (
        /*Codes_SRS_UUID_STRING_02_001: [ If uuid_string is NULL then uuid_from_string shall fail and return UUID_FROM_STRING_RESULT_INVALID_ARG. ]*/
        (uuid_string == NULL) ||
        /*Codes_SRS_UUID_STRING_02_002: [ If uuid is NULL then uuid_from_string shall fail and return UUID_FROM_STRING_RESULT_INVALID_ARG. ]*/
        (uuid == NULL)
        )
    {
        LogError("Invalid argument (uuid_string=%s, uuid=%p)", MU_P_OR_NULL(uuid_string), uuid);
        result = UUID_FROM_STRING_RESULT_INVALID_ARG;
    }
    else
    {
        /*scan until either all characters are converted and deposited into the UUID_T or found a non-expected character (that includes '\0')*/


        /*the below test shows where offsets are in a UUID representation as string*/
        /*             1         2         3        */
        /*   012345678901234567890123456789012345   */
        /*   8C9F1E63-3F22-4AFD-BC7D-8D1B20F968D6   */

        /*Codes_SRS_UUID_STRING_02_003: [ If any character of uuid_string doesn't match the string representation hhhhhh-hhhh-hhhh-hhhh-hhhhhhhhhh then uuid_from_string shall succeed and return UUID_FROM_STRING_RESULT_INVALID_DATA. ]*/
        /*Codes_SRS_UUID_STRING_02_004: [ If any character of uuid_string is \0 instead of a hex digit then uuid_from_string shall succeed and return UUID_FROM_STRING_RESULT_INVALID_DATA. ]*/
        /*Codes_SRS_UUID_STRING_02_005: [ If any character of uuid_string is \0 instead of a - then uuid_from_string shall succeed and return UUID_FROM_STRING_RESULT_INVALID_DATA. ]*/
        if (
            (!parseHexString(uuid_string + 0, 4, uuid + 0)) ||
            (uuid_string[8] != '-') ||
            (!parseHexString(uuid_string + 9, 2, uuid + 4)) ||
            (uuid_string[13] != '-') ||
            (!parseHexString(uuid_string + 14, 2, uuid + 6)) ||
            (uuid_string[18] != '-') ||
            (!parseHexString(uuid_string + 19, 2, uuid + 8)) ||
            (uuid_string[23] != '-') ||
            (!parseHexString(uuid_string + 24, 6, uuid + 10))
            )
        {
            LogError("const char* uuid_string=%s cannot be parsed at UUID_T", uuid_string);
            result = UUID_FROM_STRING_RESULT_INVALID_DATA;
        }
        else
        {
            /*Codes_SRS_UUID_STRING_02_006: [ uuid_from_string shall convert the hex digits to the bytes of uuid, succeed and return UUID_FROM_STRING_RESULT_OK. ]*/
            result = UUID_FROM_STRING_RESULT_OK;
        }
    }

    return result;
}