🚀 Mini-libc: A Minimalist Standard C Library Implementation

🌟 Overview

Welcome to mini-libc, a lightweight and freestanding implementation of the standard C library for Linux systems! This project is built from the ground up to replace the default system libc, relying solely on Linux system calls. By crafting a minimal yet functional libc, you'll dive deep into string manipulation, memory management, and low-level file I/O operations.

🎯 Objectives

• 🔍 Understand the structure and purpose of the C standard library
• 🏗️ Develop a freestanding implementation using only syscalls
• 📝 Implement fundamental string and memory functions
• 📂 Provide essential file I/O and process utilities
• ⚙️ Gain insights into Linux syscall interfaces

🔧 Core Features

📜 String Manipulation (<string.h>)

Efficient string-handling functions:

• strcpy() / strncpy() ✅
• strcat() / strncat() ✅
• strlen() ✅
• strcmp() / strncmp() ✅
• strstr() / strrstr() ✅
• memcpy() / memmove() ✅
• memset() / memcmp() ✅

📝 Input/Output (<stdio.h>)

• puts() – Simple string printing via syscall(__NR_write) 📢

📂 File & Process Control (<unistd.h>, <sys/fcntl.h>, <sys/stat.h>)

Essential POSIX-compliant file operations:

• open() / close() 🔑
• lseek() 🔄
• stat() / fstat() 📊
• truncate() / ftruncate() ✂️

⏳ Time Utilities (<time.h>)

• nanosleep() / sleep() 💤

🧠 Memory Management (<stdlib.h>, <sys/mman.h>)

Lightweight dynamic memory allocation:

• malloc() / free() 🔄
• calloc() ✅
• realloc() / reallocarray() 🔧
• mmap() / mremap() / munmap() 🗂️

🚨 Error Handling (<errno.h>)

• errno variable management for system call failures ❌

🏗️ Build & Installation

🔨 Compiling mini-libc

cd src/
make

📚 Resources & References

• 🔗 GNU libc manual
• 🔗 musl libc source
• 🔗 Linux man pages