C

Memory Allocation

Arena Bump Allocator
Mid
Fixed-Size Memory Pool Allocator
Senior
Static-Pool Allocator With Coalescing
Senior
Leak-Tracking malloc/free Wrapper
Senior
Aligned Allocator With aligned_malloc
Senior
Implement my_realloc From Scratch
Senior
Custom Heap Allocator With Coalescing
Senior

Embedded Hardware

Volatile Register Bit Manipulation
Junior
Two-Point Linear ADC Calibration
Junior
Software GPIO Debouncer
Mid
Virtual UART Driver With FIFOs
Mid
Health-Gated Watchdog Kick
Mid
Interrupt-Safe SPSC Ring Buffer
Senior
Virtual-Clock Software Timer Module
Senior
Glitch-Free Software PWM Generator
Senior
Cooperative Round-Robin Task Scheduler
Senior

Bit Manipulation

Fixed-Size Bitset Library
Junior
Byte-Swap Integer Endianness
Junior
Reverse Bits of an Integer
Junior
Swap High and Low Nibbles
Junior
Extract Bit Range From Integer
Junior
Pack and Unpack Bytes
Junior
Canonical Hex Dump Renderer
Junior
Gray Code Conversion Functions
Junior
Bit-Field Extract and Replace
Mid
Bit-Packed Packet Parser
Mid
CRC-8 Checksum Over a Buffer
Mid
Pack Three 10-Bit Integers
Mid
Base64 Encoder and Decoder
Mid
Mirror 1-bpp Bitmap Horizontally
Senior

Threads Synchronization

Counting Semaphore With Mutex and Condvar
Mid
Double Buffer With Atomic Swap
Mid
C11 Atomic Spinlock
Senior
Thread Pool With Work Queue
Senior
Reader-Writer Lock With Pthreads
Senior
Thread-Safe Logger With Mutex
Senior
Thread-Safe Bounded Task Queue
Senior
Reusable Barrier Synchronization Primitive
Senior

Pointers Data Structures Cleanup

Pointer Alignment Helpers
Junior
Implement my_memcpy and my_memmove
Mid
Generic Linked List With void* Data
Mid
Generic Dynamic Array With void*
Mid
AUTO_FREE Scope Cleanup Macro
Mid
Type-Safe Tagged Union
Mid
Reference-Counted Shared Resource
Mid
Intrusive Doubly Linked List
Mid
Memory-Mapped GPIO Register Block
Mid
Leak-Free Nested Deep Copy
Senior

String Parsing

Nibble to Hex Character
Junior
Custom strstr Without string.h
Junior
Safe Bounded String Copy
Junior
Variadic Sum With Sentinel Terminator
Junior
Tiny printf Subset With stdarg.h
Mid
Byte-Stream Packet Parser State Machine
Mid
Binary Blob Header Parser
Mid
Reimplement strtok In Place
Mid
Bounded snprintf-Style Formatter
Mid
Getopt-Style Argument Parser
Mid
CSV Parser With Quoted Fields
Mid

Processes Signals Ipc

Robust EINTR-Safe I/O Wrappers
Mid
Async-Signal-Safe In-Memory Logger
Senior

Numeric Floating Point

Integer to String in Arbitrary Base
Junior
16.16 Fixed-Point Math Library
Mid
Robust my_atoi With Overflow Status
Mid
Logical NOT With Arithmetic Only
Mid
Saturating 8-Bit Add and Subtract
Mid
Checked Integer Arithmetic
Mid
Decompose IEEE-754 Single-Precision Floats
Mid

Endianness Serialization

Endianness Detection and Byte Swapping
Junior
Runtime Endianness Detection and Byte Swapping
Junior
Pack and Unpack a CAN 2.0A Frame
Mid
Manual Big-Endian Packet Serialization
Senior

Control Flow Dispatch

Command Dispatch Table
Junior
Device Finite State Machine
Mid
Cooperative Coroutines via Context Switching
Senior
Try/Catch With setjmp and longjmp
Senior

Lock Free Atomics

Thread-Safe Circular Ring Buffer
Senior
Thread-Safe Atomic Reference Count
Senior
Lock-Free SPSC Queue With C11 Atomics
Senior
Lock-Free Stack With CAS
Senior

Macros Metaprogramming

Compile-Time Assertion Macros
Junior
Variadic Logging Macro
Junior
Reimplement offsetof With a Macro
Mid
Lower a For Loop With goto
Mid
X-Macro Enum and Name Table
Mid
container_of and Intrusive Lists
Mid
Type-Safe Generic Swap Macro
Mid
Double-Evaluation-Safe MAX Macro
Senior

Logging Diagnostics

Size-Rotating File Logger
Mid

C

Memory Allocation

Arena Bump Allocator

Fixed-Size Memory Pool Allocator

Static-Pool Allocator With Coalescing

Leak-Tracking malloc/free Wrapper

Aligned Allocator With aligned_malloc

Implement my_realloc From Scratch

Custom Heap Allocator With Coalescing

Embedded Hardware

Volatile Register Bit Manipulation

Two-Point Linear ADC Calibration

Software GPIO Debouncer

Virtual UART Driver With FIFOs

Health-Gated Watchdog Kick

Interrupt-Safe SPSC Ring Buffer

Virtual-Clock Software Timer Module

Glitch-Free Software PWM Generator

Cooperative Round-Robin Task Scheduler

Bit Manipulation

Fixed-Size Bitset Library

Byte-Swap Integer Endianness

Reverse Bits of an Integer

Swap High and Low Nibbles

Extract Bit Range From Integer

Pack and Unpack Bytes

Canonical Hex Dump Renderer

Gray Code Conversion Functions

Bit-Field Extract and Replace

Bit-Packed Packet Parser

CRC-8 Checksum Over a Buffer

Pack Three 10-Bit Integers

Base64 Encoder and Decoder

Mirror 1-bpp Bitmap Horizontally

Threads Synchronization

Counting Semaphore With Mutex and Condvar

Double Buffer With Atomic Swap

C11 Atomic Spinlock

Thread Pool With Work Queue

Reader-Writer Lock With Pthreads

Thread-Safe Logger With Mutex

Thread-Safe Bounded Task Queue

Reusable Barrier Synchronization Primitive

Pointers Data Structures Cleanup

Pointer Alignment Helpers

Implement my_memcpy and my_memmove

Generic Linked List With void* Data

Generic Dynamic Array With void*

AUTO_FREE Scope Cleanup Macro

Type-Safe Tagged Union

Reference-Counted Shared Resource

Intrusive Doubly Linked List

Memory-Mapped GPIO Register Block

Leak-Free Nested Deep Copy

String Parsing

Nibble to Hex Character

Custom strstr Without string.h

Safe Bounded String Copy

Variadic Sum With Sentinel Terminator

Tiny printf Subset With stdarg.h

Byte-Stream Packet Parser State Machine

Binary Blob Header Parser

Reimplement strtok In Place

Bounded snprintf-Style Formatter

Getopt-Style Argument Parser

CSV Parser With Quoted Fields

Processes Signals Ipc

Robust EINTR-Safe I/O Wrappers

Async-Signal-Safe In-Memory Logger

Numeric Floating Point

Integer to String in Arbitrary Base

16.16 Fixed-Point Math Library

Robust my_atoi With Overflow Status

Logical NOT With Arithmetic Only

Saturating 8-Bit Add and Subtract

Checked Integer Arithmetic

Decompose IEEE-754 Single-Precision Floats

Endianness Serialization

Endianness Detection and Byte Swapping

Runtime Endianness Detection and Byte Swapping