Add integers safely, and prove the safety
c++,c,standards,verification,correctness
OP's approach is optimally portably staying within type int as well as safe - no undefined behavior (UB) with any combination of int. It is independent of a particular int format (2's complement, 2's complement, sign-magnitude). In C, int overflow/(underflow) is undefined behavior. So code, if staying with int, must...
How to check data when using binding in WPF
You can still call your background checks if you call them right after the user has updated the textbox content. private string name; public string Name { get { return name; } set { CheckName(value); // Or whatever are you check functions name = value; PropertyChanged("Name"); } } I hope...
Can I access delayed value in SystemVerilog assertion
fpga,verification,system-verilog,assertion
You can use the $past(...) system task. Using $past(rdaddress) will return the value of rdaddress that was sampled in the previous cycle. You can specify how many cycle in the past to go with the second argument. In your case, calling $past(rdaddress, 2) will return the value of rdaddress 2...
Why there are verilog verification files not in the form of module?
It is common to include files of arbitrary content into Verilog modules. This is done using the include compiler directive, as described in IEEE Std 1800-2012, section "22.4 `include": The file inclusion (include) compiler directive is used to insert the entire contents of a source file in another file during...
Is there a way to prove properties about my C++ programs?
c++,verification,coq,proof-of-correctness
It depends on what you mean by "proving a property". As far as I know, there are many static analysis tools for checking simple properties of C programs, and they vary widely in terms of expressiveness, ease to use, soundness of the analysis, etc. They are typically used for checking...
Unable to set Read-Write permission for twitter app
mobile,twitter,permissions,verification,read-write
Thanks for your great efforts guys. But, It's already fixed by the twitter's own development team for me.
Python Requests POST to website with verification token
python,post,token,python-requests,verification
You should only need the data from the first page, and as you say, the __RequestVerificationToken changes with each request. You'll have to do something like: GET request to https://www.dspayments.com/FAIRFAX harvest __RequestVerificationToken value (Requests Session will take care of any associated cookies) POST using the data you scraped from the...
How to reason about array access in VST?
In "standard" Verifiable-C, memory references cannot occur in expressions except at top level within a load statement: x = a[e]; or x = *(e.field); (same as x = e->field;) where e is any expression that does not access memory. Or, a store statement, a[e1] = e2; or e1->field = e2;...
How to validate data in onCreateUser without losing the form data?
I went ahead and reproduced your code on a Meteorpad and from what I can tell, the form data does still persist. You just need to access it via the attributes variable in the client-side. There may be something I am missing, but i took what you posted above and...
URL in email body is being checked before email is sent
Might be a spam filter that checks the links in all emails. For example, gmail scans all emails for links to malicious websites. You can add a recaptcha to the verification page to make sure it is visited by a human, not some spam filtering bot....
Verification initialization failed: Sinch backend request failed with code: 40003 message: Invalid number
The number needs to be entered in international format +countrycode+number
How to ensure a user has a valid Paypal account to accept payments with?
php,paypal,payment,verification,account
You can use one of our classic API called GetVerifiedStatus. This API basically check against the status of PayPal Account, whether it is Verified or Unverified. You can even get whether the account is a Business account or Personal Account. There are a lot of other information which you could...
“openssl verify” gives OK for bad certificate chain
openssl,certificate,verification
The original answer proved to be wrong, so here's another one :) It looks like openssl verify does only the certificate chain verifications and it doesn't check any flags (even with correct -purpose set). The library however does check the flags when you actually do an ssl/tls connection: $ openssl...
The verification Procedure and making new users logic, parse.com
ios,objective-c,authentication,parse.com,verification
If you don't want to create a user in Parse before the validation is complete, you could save the validation token to NSUserDefaults. In the method in VerificationController that sends the verification code... NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:verificationCode forKey:@"code"]; [defaults synchronize]; Then, to check when the user enters...
Proof of stream's functor laws
verification,idris,coinduction
I was able to get a little help on IRC from Daniel Peebles (copumpkin) who explained that being able to use propositional equality over codata is just generally not something usually permitted. He pointed out that it's possible to define a custom equivalence relation, like how Agda defines ones for...
Hashing and password_verify
php,hash,login,passwords,verification
you do not hash the password the user types into the form rather you hash the password when the user is actually registering into your site $password = filter_var($_POST['aPass'] , FILTER_SANITIZE_STRING) ; $newPassword = password_hash($password , PASSWORD_DEFAULT); // input $newPassword into the database. For the login process and how to...
Verifying the authenticity of an Android App
android,authentication,google-play,verification
You could verify the package name and the installation manager package. You can use the method: public abstract String getInstallerPackageName (String packageName) Retrieve the package name of the application that installed a package. This identifies which market the package came from....
How to check for an @ in an email address from a form post
php,forms,email,login,verification
You can use the php function strpos http://php.net/strpos if(strpos($myEmailPostVariable, '@') === FALSE) { // do things here to say it failed } If you are fixed on using an array then you could use explode http://php.net/explode $parts = explode('@', $myEmailPostVariable); if(count($parts) != 2) { // do things here to say...
Multiple serial numbers using the code from user TLama ? (InnoSetup)
inno-setup,verification,serial-number
It didn't work as expected because you were overwriting the CanContinue value by the second line of code which led to work only for the second serial number. You should store the returned value of the GetSerialNumber function to some local variable to avoid multiple function calls and use the...
Javascript - verify empty inputs
javascript,forms,input,verification
you have an error in your code, there is one closing bracket too much change if (document.form['form']['name'].value != "" && document.form['form']['city'].value != "" )) { to if (document.form['form']['name'].value != "" && document.form['form']['city'].value != "" ) { ...
How to formulate a connection between pre-execution and post-execution state of a method?
You can use the old keyword. Let's take a look at an example. The following method sets to zero all positions of an array containing the element x and leaving the rest as they are. Here's the code: method setToZero(a: array<int>, x : int ) requires a != null; modifies...
Tactic failure: Use forward_call W. method signature
Your guess_sqrt_spec has an error in line 68 of verif_sqrt.v, where you give the return type as "tint" (signed integer) where the sqrt.c program has "tuint" (unsigned integer). Then the VST's forward_call tactic has a misleading and unhelpful error message, complaining about the witness type instead of the return-type mismatch....
How to display error in real-time on HTML form? (Javascript included)
javascript,php,html,forms,verification
Here is an example of how to test a form field using jQuery's blur() function - $('input[name="foo"]').blur(function() { var currentValue = $(this).val(); var testValue = 'crumple'; if(currentValue != testValue) { $(this).next('span').html('FAIL'); } else { $(this).next('span').html(''); } }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <input name="foo" type="text" /><span></span> ...
how to validate credit card info(billing, card number etc) through authorize.net?
php,validation,credit-card,verification,authorize.net
No. The only way to know a credit card is valid is to process a transaction. Only then is the bank contacted to validate the credit card. FYI, I am the author of the article you linked to....
Verify app purchase via Google Login
android,unity3d,verification,google-wallet
Yeah there's a licensing API. http://developer.android.com/google/play/licensing/index.html I think that meets your requirements?...
Google's new reCaptcha site verification returns no responce
javascript,recaptcha,verification
It is not possible to make XHRs ("AJAX requests") to hosts other than the one serving a website due to the so-called "same origin policy" (SOP) to prevent XSS attacks. However you can post to the reCaptcha site from a php proxy, that you run on your own host. An...