🚀 Assembly MinilibC

📝 Description

A minimalist implementation of the standard C library functions in x86-64 assembly language. This project provides low-level implementations of common string and memory manipulation functions.

✨ Implemented Functions

Category	Functions
String Operations	strlen, strchr, strrchr, strcmp, strncmp, strcasecmp, strstr, strpbrk, strcspn, strfry
Memory Operations	memset, memcpy, memmove, memfrob
Other Utilities	ffs (find first set bit)

🔎 Function Details

• strlen: Calculate the length of a string
• strchr/strrchr: Locate character in string (first/last occurrence)
• strcmp/strncmp: Compare strings (full/n characters)
• strcasecmp: Case-insensitive string comparison
• strstr: Locate a substring
• strpbrk: Search a string for any of a set of characters
• strcspn: Get span until character in string
• strfry: Randomize a string
• memset: Fill memory with a constant byte
• memcpy: Copy memory area
• memmove: Copy memory area with overlap handling
• memfrob: Frobnicate (encrypt) a memory area
• ffs: Find first bit set in a word

🛠️ Building the Library

# Build the shared library
make

# Clean object files
make clean

# Full clean (remove objects and binary)
make fclean

# Rebuild from scratch
make re

# Run tests
make test

📚 Usage

Once compiled, you can use the library by preloading it:

LD_PRELOAD=./libasm.so your_program

Or link it directly during compilation:

gcc -o your_program your_source.c -L. -lasm

📋 Requirements

• NASM assembler
• GCC compiler
• Linux environment (x86-64)

💡 Implementation Details

All functions are written in x86-64 assembly language following the System V AMD64 ABI calling convention, where:

• First integer/pointer argument: RDI
• Second integer/pointer argument: RSI
• Third integer/pointer argument: RDX
• Return value: RAX

📜 License

This project is part of an EPITECH school assignment.