Questions tagged [io]
In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer) and the outside world (possibly a display, an information storage system, or another information processing system).
496
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Append Buffer for Buffering Small write(2) Calls
The purpose of this is written in the comment below (it is meant to be used in a text editor):
abuf.h:
...
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2
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A small header-only input output library
The library (inspired by stb libraries) attempts to provide some commonly used functions (reading a file into memory, determining the size of a file) that are missing from the C standard library ...
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1
answer
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Read a line from a stream
Since the standard fgets() does not suffice for my use cases, as it doesn't automatically enlarge the target buffer if needed, and ...
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6
votes
2
answers
647
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C- Reading and Parsing textfile
I'm relatively new to C programming and currently tackling exercises on Advent of Code. The challenge I'm working on involves calculating the sum of integers within each group from a file and ...
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votes
2
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Simple GPIO design module in SystemVerilog
I am designing a very crude general-purpose input/output (GPIO) module to provide IO pin control to a RISC-V (like) architecture microprocessor I am currently playing with.
This is the code so far:
<...
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1
answer
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Multithreaded O_DIRECT file read-and-process program
Here is my code. It reads a file and returns the sum of all the bytes in the file:
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2
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Detecting when a user stops typing
I wanted to detect when a user stops typing. I encountered this answer from SO (Not the selected answer, but the second one which seem to be better):
https://stackoverflow.com/a/5926782/17746636
But I ...
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vote
3
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C++ getline implementation for custom stdlib
I'm writing my own "standard library". It relies on nothing but syscalls, so I've had to make my own implementations of everything, including getline (...
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5
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Python code using *args to print warnings in color
I have this code, which works for the simple tasks I want. But I have questions.
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1
answer
647
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Crossword puzzle app
I was hoping someone could give me any tips or advice on this program I wrote for my high school class. The point of the program is to create a workable crossword puzzle in the console. If it works ...
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1
answer
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pure Bash way to trim
How can I improve this? I added the while read loop to handle preceding newlines.
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- 75
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votes
2
answers
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Capture stdout output of a function call
Are there any major flaws to implement this test helper function?
I know that the preferred way (refactoring) would simply make the function to be tested return its value and delegate printing to ...
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votes
1
answer
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Readlines abstraction for Golang
I've just started learning Golang and was solving some problems which required me to read lines of text from a file. I decided to abstract away the reading part so that I can use Go's ...
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2
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Sort todo.txt items by due date in Python 3
I am using the following format for my task management: https://github.com/todotxt/todo.txt
Do some stuff +uni due:2022-12-31
Write some paper +uni due:2023-01-10
...
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answers
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Code lines counter
It is a Windows command line utility for counting lines of code in a source code directory.
It will count loc and sloc.
I read from a file character by character using fgetc in the CountLines(...) ...
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2
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K&R Exercise 5-11. Modify the "detab" - to accept a list of tab stops as arguments
So far I have reached chapter 5 of the K&R Book, Edition 2 from which I have been learning C. I spent a few days thinking of a solution to this program. I wrote two or three versions of the same ...
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2
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generate lottery numbers to store in a text file
I scripted a program in python to generate lottery numbers for user. There are two playing methods:
Lotto6aus49: User can choose any 6 numbers out of 49.
Eurojackpot: User can choose 5 numbers out of ...
2
votes
1
answer
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K&R Exercise 1.22 - "fold" long input lines
Until recently, I decided to go back to Chapter 1 of the K&R Book, Edition 2, to try to "improve" the code I've already done. I have also made some changes since I was limited to just ...
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K&R Exercise 4-6. Add commands for handling variables
For the following exercise (Chapter 4, Ex-4.6) of the Book (K&R 2nd Edition):
Exercise 4-6. Add commands for handling variables. (It's easy to
provide twenty-six variables with single-letter ...
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3
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K&R Exercise 3-3. Expands shorthand notations (e.g., a-z to abc..xyz, 0-9 to 012..789)
I have been learning C with K&R Book 2nd Ed. So far I have completed quite a few exercises.
For the following exercise (Chapter 3, Ex-3.3):
Exercise 3-3. Write a function expand(s1, s2) that ...
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votes
1
answer
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streaming / low memory groupby in julia
I am working on a groupby-aggregation function that will work without RAM overflow issues. Essentially, I want it to run as fast as possible, while not necessarily loading the entire data structure ...
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2
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Game loop using Future.wait_for to check for input
I started writing this game from scratch yesterday, and I wasn't completely new to C++'s future library.
I only use the ...
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2
answers
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Re-designing c-style Input Output
Re - designing c-style input output [ btw I use printf() and scanf() in the core ]
Reasons for redesigning it :-
Needs 2 functions for input output [ namely ...
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1
answer
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improved "tee" utility
We have modified the tee program with your suggestions from the previous pull request. Did I implement well? I would like to optimize the program even more, what ...
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vote
1
answer
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Process a binary file by chunk using a read stream in nodejs
I want to process a file chunk by chunk to prevent memory exhaustion. I need to consume the file using a read stream. When trying it, this implementation seems to work fine.
I am asking your expert ...
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2
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another attempt to implement the tee command
I implemented the tee command from linux. The program implements the -a option
Reads standard input until end-of-file, write a ...
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1
vote
1
answer
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Passwords with C++ Console
I am really, really new to coding in general and especially c++. To get more familiar with c++ I am trying to do a series of projects with c++ console apps. One of my projects is with a database that ...
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3
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tee: copy standard input to both stdout and a file
I implemented the tee command from linux. The program also handles the -a option for adding text to the end of a file if it ...
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0
answers
765
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A POSIX getdelim() and getline() implementation for MSVC
Tired of always having problems in reading arbitrary length lines from file under Windows, I tried to write a POSIX getdelim() and ...
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votes
2
answers
327
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Read a file format with mixed CSV and non-CSV content
I have a file format that I need to read which contains blocks of CSV data interspersed by non-CSV (or at least, inconsistent CSV) lines. Other than the very first line of the file (which has comma-...
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0
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A Command Line To-Do List (CLI) application written in NodeJS
I wrote this code for myself so I can manage my personal to-do list easier. Considering, I spend most of my time in the terminal, it made sense.
I have worked on the project as a way of practising my ...
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1
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C++ intializing and saving mp4 ftyp box struct byte by byte
I'm unsure whether the way I'm performing initialization is recommended, and whether there is a simpler way to save out a struct like the one I'm using. The main points of feedback I'm looking for are ...
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60
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Quickly read numeric input
Do you have any criticisms or corrections or improvements?
I need to read only numbers(and this numbers could be from 0 to 1000000)
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2
answers
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Function that behaves as dup2
I am reading the book Advanced Programming in the UNIX Environment and I have tried to solve the following exercise: Write a function that performs the same actions as ...
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2
answers
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Retry read/write until all bytes are transferred or error occurs
Currently I have a wrapper function for the read/write system calls, the purpose of which is to eliminate partial transfer ...
user256024
3
votes
1
answer
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get_line(): An alternative implementation of standard C library's getline() function
get_line(): An alternative implementation of standard C library's getline() function.
Syntax: char *get_line(int fd, int *error_num);
I know that I can declare/...
user245050
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1
answer
3k
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Decompress tar.gz file in Go
I want to extract tar.gz file and store the contents in the same directory. I got below method which does the job but I wanted to see if there is any way to improve ...
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1
answer
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C# Async FileInfo Extensions (Copy, Move, Delete)
Here is my effort to implement extensions for FileInfo object:
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4
answers
845
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Generate HTML select tag and options using a text file having list of countries
The code below will generate an HTML select tag and options using a text file having list of countries. If the file doesn't exist or contains only empty / white space lines then generate an input box ...
user245050
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1
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295
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Optimized way to save list of files
I would like to optimize the way that I save files.
Each second I save lots of strings in different files. What I want to do is bunch up these IO tasks so they happen in bursts, instead of spread out ...
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1
answer
283
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Iterate through non-empty words from text files
Given a file or directory, create an iterator that returns the non-empty words from the file or from all files recursively in the directory. Only process ".txt" files. Words are sequence of ...
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3
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Reading 100,000 data files in Python
I need to manipulate data found in multiple data files (~100,000 files). One single data file has ~60,000 rows and looks something like this:
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2
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224
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File reader and writer
I was told that the following code of mine was poorly written. How bad is it? Do you have any recommendations?
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2
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485
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Word wrap with file input & ouput
As this is a very basic word wrap program, it has at least the following 3 limitations :-
The file should have a terminating newline.
The column number at which the lines are to be wrapped must be ...
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1
answer
329
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C++ simple type serialization for streaming primitive- / pod types over a web socket (e.g. asio)
I am experimenting with asio web sockets and tried to write a simple serializer / deserializer.
I am also thinking about an approach on how to serialize some type information alongside the actual data....
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1
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how to make inputs work well with special characters using the locale.h library? [closed]
for some reason the function setlocale(LC_ALL, "English") doesn't work when using an input function,(getchar, scanf, fgets,..), to get a special character, (Ç, ã, õ, é,...).
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Input validation
I am learning C from C Primer Plus, and am still a beginner. I have been introduced to only two functions for input, scanf() and ...
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Efficiently read a file into a (C) string using POSIX APIs
Exactly what the title says, this is a C++ class that attempts to read a file into a null-terminated string as efficiently as possible, using POSIX APIs. Obviously this is not intended to be portable ...
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2
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Filtering FASTQ file based on read names from other file (how to increase performance) Python
I have some code here that basically takes in a list of IDs (sequencing read names) using STDIN, and then filters fin (a gzipped FASTQ file) to just those reads ...
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2
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127
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Getline function
The following is my attempt at writing a getline() function that makes it a bit easier to work with. I suppose an easier way would be to use ...
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