nameCheck

int validateName (void)
{
    char buffer[81] = "";
    int valid = VALID;
    while(1)
    {
        valid = VALID;

        printf("Name: ");

        fgets(buffer, (BUFFER_SIZE -1), stdin);

        if(buffer[0] == '\n')
        {
            valid = QUIT_CONDITION;
            break;
        }
        else if(strlen(buffer) > 30 || strlen(buffer) < 1)
        {
            valid = INVALID;
        }
        else
        {
            for(int i = 0; i < strlen(buffer); ++i)
            {
                //A-Z range
                if((buffer[i] >= 0x41) && (buffer[i] <= 0x5A))
                {
                    continue;
                }
                //a-z range
                else if((buffer[i] >= 0x61) && (buffer[i] <= 0x7A))
                {
                    continue;
                }
                //Foreign characters
                else if((buffer[i] >= 0x80) && (buffer[i] <= 0x9A))
                {
                    continue;
                }
                //More foreign characters
                else if((buffer[i] >= 0xA0) && (buffer[i] <= 0xA5))
                {
                    continue;
                }
                //0-9 range
                else if((buffer[i] >= 0x30) && (buffer[i] <= 0x39))
                {
                    continue;
                }
                //Checks for special characters accepted as per the requirements.
                else if((buffer[i] == ' ') || (buffer[i] == '!') || (buffer[i] == '&') || (buffer[i] == '(') (buffer[i] == ')') ||(buffer[i] == '+'))
                {
                    continue;
                }
                //More special characters.
                else if((buffer[i] == '-') || (buffer[i] == '.') || (buffer[i] == '/') || (buffer[i] == '@') || (buffer[i] == '[') || (buffer[i] == ']'))
                {
                    continue;
                }
                else
                {
                    valid = INVALID;
                    break;
                }
            }
        }
        //If all characters are valid, or if ENTER was pressed, exit the loop.
        if (valid == VALID)
        {
            break;
        }
        else if(valid == QUIT_CONDITION)
        {
            break;
        }
        //If the input was invalid, check
        else
        {
            printf("\nSorry, that name isn't valid. Try again, or press ENTER to quit. \nName: ");
        }
    }

    return valid;
}