nf | minimal programming language , designed as an interactive | Interpreter library

by luke8086 C Version: Current License: GPL-2.0

X-Ray Key Features Code Snippets(1)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | nf Summary

nf is a C library typically used in Utilities, Interpreter applications. nf has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

A minimal programming language, originally designed as an interactive environment for my os/64. Inspired by Forth, but not compatible. Easily portable to different platforms, including DOS and bare-bones x86. Main characteristics: imperative, stack-based, interpreted, compiled to bytecode.

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Support

nf has a low active ecosystem.

It has 7 star(s) with 2 fork(s). There are no watchers for this library.

It had no major release in the last 6 months.

nf has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of nf is current.

Quality

nf has no bugs reported.

Security

nf has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

nf is licensed under the GPL-2.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

nf releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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nf Key Features

No Key Features are available at this moment for nf.

nf Examples and Code Snippets

Queues an embedding batch .

python

Lines of Code : 50

License : Non-SPDX (Apache License 2.0)

Copy

def enqueue_tpu_embedding_sparse_batch(sample_indices,
                                       embedding_indices,
                                       aggregation_weights,
                                       device_ordinal,

Community Discussions

Trending Discussions on nf

Using std::atomic with futex system call

how to print per column use awk

Windows Api, COM port: transmit data after receiving

compiler problem with solidity and truffle

Debugging Memory Mapped Files

How to remove a country from intl-tel-input

Why CreateFileMappingA and CreateFileA uses different return values on error?

How to join with DB::table and orderBy jointable attribute set 0 if no join found

awk + how to get latest numbers in file but exclude number until 4 digit

How to add field separator based on headers length?

QUESTION

Using std::atomic with futex system call

Asked 2021-Jun-15 at 20:48

In C++20, we got the capability to sleep on atomic variables, waiting for their value to change. We do so by using the std::atomic::wait method.

Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.

Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.

Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*

On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says

The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.

Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.

Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.

So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?

(Solutions like mixing atomics and condition variables exist, but sub-optimal)

...

ANSWER

Answered 2021-Jun-15 at 20:48

You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.

Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.

For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values ^[1]. This is an assurance that will make it possible to extract out this value.

... and casting std::atomic to u/int* is UB

This isn't actually the case.

std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).

As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:

Source https://stackoverflow.com/questions/67034029

QUESTION

how to print per column use awk

Asked 2021-Jun-14 at 19:24

the content of a.txt

...

ANSWER

Answered 2021-Jun-14 at 04:43

Because your $i is only visible to bash, not awk. You need to pass it into your awk script as:

Source https://stackoverflow.com/questions/67964796

QUESTION

Windows Api, COM port: transmit data after receiving

Asked 2021-Jun-14 at 07:22

I have a microcontroller which I communicate with my windows pc, through FT232RL. On the computer side, I am making a C-library to send and receive data, using windows API.

I have managed to:

Receive data (or multiple receives),
Transmit data (or multiple transmits),
First transmit (or multiple transmits) and then receive data (or multiple receives)

But I have not managed to:

Transmit Data and then receive.

If I receive anything, and then try to transmit, I get error. So, I guess when I receive data, there is a change in configuration of the HANDLE hComm, which I cannot find.

So the question is, what changes to my HANDLE hComm configuration when I receive data, which does not allow me to transmit after that?

Here is my code/functions and the main() that give me the error. If I run this, I get this "error 6" -screenshot of the error down below-:

...

ANSWER

Answered 2021-Jun-14 at 01:17

According to MSDN:Sample, Maybe you need to set a pin's signal state to indicate the data has been sent/received in your microcontroller program. More details reside in your serial communication transmission of data standard. And you should write code according to the result of WaitCommEvent(hCom, &dwEvtMask, &o); like the linked sample.

Source https://stackoverflow.com/questions/67903175

QUESTION

compiler problem with solidity and truffle

Asked 2021-Jun-12 at 18:56

So I'm trying to learn to build NF token, and I cloned a repo. It's supposed to work with truffle. The thing is I have an error with the compiler, and I don't really understand. Indeed what I know is that the solidity compiler have problems with different versions, hence working with truffle CLI that works better with different versions projects.

So I tried to change to "pragma solidity >0.5.8 <0.6.0;", I did sudo truffle compile, and still have the error.

The error message I got is:

my typo `Source file requires different compiler version (current compiler is 0.7.4+commit.3f05b770.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version

I know that I need to find a good version of solidity and truffle, but I believe that my versions are okay :

Truffle v5.0.5 (core: 5.0.5) Solidity v0.5.0 (solc-js) Node v14.16.0

...

ANSWER

Answered 2021-Mar-16 at 11:01

Change the compiler version in the truffle-config.js file to match the one your are using in your smart contract

Source https://stackoverflow.com/questions/66644425

QUESTION

Debugging Memory Mapped Files

Asked 2021-Jun-11 at 12:51

I’m developing a .NET program which suppose to be communicate with other existing program in same machine using Shared Memory (Memory Mapped Files), The existing program itself include a native dll and .NET wrapper / bridge dll which I could consume to communicate with the other program.

The thing is the other program is very buggy and the source codes of the program and dll are long gone, so my goal is to recreate the other program. I could decompile .NET dll but it just straight P/Invoke the native dll.

Fortunately, I able to view the memory mapped file with System.IO.MemoryMappedFiles.MemoryMappedFile but that’s all I got, I have no idea in which offset the dll read the data from memory mapped file when I call certain functions from it (Most of the time the dll only doing read and no write)

I also tried to hook CreateFileMapping, OpenFileMapping and MapViewOfFile in C++ program and call certain functions inside the native dll but those hooked function only called once in during initialization and did not trigger when invoke function in dll that suppose to read data from memory mapped file. If I dare to guess, the dll must be has pointer to the memory mapped file.

So my question, is it possible to put breakpoint or detect when any process attempt to read / write of certain region of memory mapped file? For an instance, I'd like to know whether there's read process or pointer pointing at offset 0xdeadbeef in my memory mapped file. I'm open to alternative, so let me know if you had any better idea

...

ANSWER

Answered 2021-Jun-09 at 17:45

I'm not familiar with Memory Mapped File but if the two process share same memory, I believe it has same physical address, if this is true then you could probably use Cheat Engine with kernel mode.

Just keep in mind that it can cause system instability or crash so make sure to save all your works before proceeding. You can follow this steps:

First open one of the program, make sure that "shared memory" is created before proceeding into the next step.
Open Cheat Engine, make sure to enable kernel mode for OpenProcess in Settings -> Extra and enable kernel debugger in Settings -> Debugger Options (otherwise you won't be able to observe the instructions that access the memory)
Open the process in Cheat Engine, select the program that you launched in the first step
Now scan the memory inside cheat engine, since you mentioned that you able to view the memory, take out some chunk of bytes that you wish to monitor, change value type to array of byte and scan for those bytes
Scan result will appear in the left pane, you might found multiple result, there's only one correct address most of the time and the rest is accidentally match with the value you scan for, right click and select Browse this memory region, make sure that surrounding data match with what you expect
Back to main window, double click the correct ones and it will appear on the bottom pane, right click it and select "DBVM Find out what writes or access this address", a dialog will appear (or your system might crash), the most important part is ensure that the physical address there instead appearing at textbox
Select access type, you could watch only writes or both read and writes and hit "Start watch" button
Every time any process make an attempt to access or write into that memory region, new instruction will appear in the list.

In my opinion, this topic is close to reverse engineering. Since you're open to suggestion, here's my other two cents: if you had a plan to re-create the existing program which emit the data via shared memory and you're developing the client too, why not remake both of them from scratch so you don't have to deal with this?

Source https://stackoverflow.com/questions/67872555

QUESTION

How to remove a country from intl-tel-input

Asked 2021-Jun-11 at 12:14

(new in javascript)

I am asked to remove a country (China) from the dropdown menu of the plugin intl-tel-input

the code below displays the dropdown menu and it looks that it calls the utils.js file to retain the countries

...

ANSWER

Answered 2021-Jun-11 at 12:14

If you take a look at the intl-tel-input documentation regarding Initialisation Options. There is an option called excludeCountries.

We can modify your initialisation code to include this option to exclude China:

Source https://stackoverflow.com/questions/67935923

QUESTION

Why CreateFileMappingA and CreateFileA uses different return values on error?

Asked 2021-Jun-10 at 21:16

Both CreateFileMappingA and CreateFileA returns HANDLE type, but CreateFileMappingA returns NULL on error, and CreateFileA returns INVALID_HANDLE_VALUE instead.

I'm wondering why the API is designed like that, why won't those APIs both use NULL or INVALID_HANDLE_VALUE?

...

ANSWER

Answered 2021-Jun-10 at 21:16

As explained by Raymond Chen in Why are HANDLE return values so inconsistent?:

Why are the return values so inconsistent?

The reasons, as you may suspect, are historical.

The values were chosen to be compatible with 16-bit Windows

Source https://stackoverflow.com/questions/67746351

QUESTION

How to join with DB::table and orderBy jointable attribute set 0 if no join found

Asked 2021-Jun-10 at 10:50

I have a DB::table query that I make a join with. In case the join is not possible, I want to set the value of the attribute that I'm looking for with my join to 0 for the order. With my current query, entries that have no join are ignored.

...

ANSWER

Answered 2021-Jun-10 at 01:58

SELECT A.id,IFNULL(B.field_that_might_be_matched,0)
FROM table_a A
LEFT JOIN
     table_b B
ON
     A.id = B.table_a_id
ORDER BY 2

Source https://stackoverflow.com/questions/67913537

QUESTION

awk + how to get latest numbers in file but exclude number until 4 digit

Asked 2021-Jun-09 at 16:37

we have file like the following

more file

...

ANSWER

Answered 2021-Jun-09 at 09:41

Like this?:

Source https://stackoverflow.com/questions/67901338

QUESTION

How to add field separator based on headers length?

Asked 2021-Jun-08 at 07:19

I'm trying to add a delimiter to the following text format (actual file has many more fields).

What I see is the length of each field is given by the length of each underscores blocks ------------ that are below each header.

Input:

...

ANSWER

Answered 2021-Jun-08 at 07:19

You may use this awk that will with any version of awk:

Source https://stackoverflow.com/questions/67877995

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Vulnerabilities

No vulnerabilities reported

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