Metis | efficiently circumventing censorship using existing tools | Proxy library

After using the compiler flags suggested by n. 1.8e9-where's-my-share m. to diagnose memory access violations I've discovered that the memory corruption is indeed caused by a function that is called just before the one in my original question.

The offending function reads in data from a text file using sscanf, and would allocate a 3-element array for each line of the file (for the 3 numbers to be read in per line). The next part is conjecture, but I think that the problem arose because sscanf returns a NULL at the end of a sequence it reads. I'm surmising that this NULL was written to the next byte along from the 3 allocated, such that the next time malloc tried to allocate data the first thing it saw was a NULL, causing it to return without actually having allocated any space. Then the next function to try and use the allocated memory would come along and crash because it's trying to access unassigned memory that malloc had reported to be allocated.

I was able to fix the bug by changing the size of the allocated array in the read function from 3 to 4 elements. This would seem to allow the NULL character to be stored without it interfering with subsequent memory allocations.

To expand on @HighPerformanceMark's comments, the best thing to do is to define an Asteroid type which holds all of the information about an asteroid, and then to create an array of Asteroids.

The Asteroid type should initially just contain the data about an asteroid,

There are two issues with your code:

1. This: if check_name == coins_list: will always return false, since check_name is a string and coins_list is a list. You want if check_name in coins_list:.
2. baseurl isn't defined in the code snippet. Change it to url.

Perform both these changes, and you should have a nonempty output in your text file. The URLs in this file appear to be well-formed.

Replace

I can't answer but maybe I can orient you.

First nmake is not make. It will not work with any makefile not written specifically as an nmake makefile. And it's only available on Windows. So, best to just forget it exists.

Second, it's important to understand how make works: rules in makefiles are a combination of targets/prerequisites, and a recipe. The recipe is not in "makefile" syntax, it's a shell script (batch file). So make works in tandem with the shell, to run commands. Which shell? On POSIX systems like GNU/Linux and MacOS it's very simple: a POSIX shell; by default /bin/sh.

On Windows systems it's much less simple: there are a lot of options. It could be cmd.exe. It could be PowerShell. It could be a POSIX shell, that was installed by the user. Which one is chosen by default, depends on how your version of make was compiled. That's why you see different behaviors for different "ports" of make to Windows.

So, if you look at the makefiles you are trying to use you can see they are unquestionably written specifically for a POSIX system and expect a POSIX shell and a POSIX environment. Any attempt to use a version of make that invokes cmd.exe as its default shell will fail immediately with syntax errors ("" was unexpected at this time.).

OK, so you find a version of make that invokes a POSIX shell, and you don't get that error anymore.

But then you have to contend with another difference: directory separators. In Windows they use backslash. In POSIX systems, they use forward slash and backslash is an escape character (so it's not just passed through the shell untouched). If you are going to use paths in a POSIX shell, you need to make sure your paths use forward slashes else the shell will remove them as escape characters. Luckily, most Windows programs accept forward slashes as well as backslashes as directory separators (but not all: for example cmd.exe built-in tools do not).

Then you have to contend with the Windows abomination known as drive letters. This is highly problematic for make because to make, the : character is special in various places. So when make sees a line like C:/foo:C:/bar its parser will get confused, and you get errors. Some versions of make compiled for Windows enable a heuristic which tries to see if a path looks like a drive letter or not. Some just assume POSIX-style paths. They can also be a problem for the POSIX shell: many POSIX environments on Windows map drive letters to standard POSIX paths, so C:\foo is written as /c/foo or /mnt/c/foo or something else. If you are adding paths to your makefile you need to figure out what the right mapping, if any, is and use that.

That's not even to start discussing the other differences between POSIX and Windows... there are so many.

From what you've shown above, this project was not written with any sort of portability to Windows in mind. Given the complexity of this, that's not surprising: it takes a huge amount of work. So you have these options that I can see:

1. Port it yourself to be Windows-compatible
2. Try to get it working inside cygwin (cygwin is intended to be a POSIX-style environment that runs on Windows)
3. Try to get it working in WSL
4. Install a virtual machine using VMWare, VirtualBox, etc. running a Linux distribution and build and run it there

Unfortunately I don't know much about the pros and cons of these approaches so I can't advise you as to the best course.

The route I chose, long long ago, was to get rid of Windows entirely and just use GNU/Linux. But of course that won't be possible for everyone :).

__imp_ prefix in unresolved external runtime library symbol from the linked library means the library was built with DLL runtime (/MD in C++ -> Code Generation -> Runtime Library).

If you build the application with static runtime (/MT) the symbols from the DLL runtime will be unresolved. Runtime settings should be the same for all compilation units.

The code below contains

• If user clicks on 'add to cart' button, if product already exists in cart, then redirect to the cart page url.
• If product is not already in cart, then add product into cart and go to cart page url.

However, there is one condition for the code to work, you need first in backend:

WooCommerce > Settings > Products > Display > Disable the checkbox: “Enable AJAX add to cart buttons on archives” option (See image)

Then you get

The issue seems to be that $cart is null, maybe try:

for example in App.js make :