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Minilibc

Minilibc is a lightweight C library designed to reimplement key string and memory manipulation functions from the standard C library using assembly language.

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Features

The following functions are fully implemented in assembly:

• String Manipulation

  • strlen ✅ — Calculate the length of a string.
  • strchr ✅ — Locate the first occurrence of a character in a string.
  • strcmp ✅ — Compare two strings.
  • strncmp ✅ — Compare two strings up to a specified length.
  • strcasecmp ✅ — Compare two strings ignoring case.
  • strstr ✅ — Locate a substring within a string.
  • strpbrk ✅ — Find the first occurrence of any character from a set.
  • strcspn ✅ — Determine the length of a segment not containing specified characters.

• Memory Manipulation

  • memset ✅ — Set a block of memory to a specific value.
  • memmove ✅ — Safely copy memory areas that may overlap.

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Why Minilibc?

• Lightweight: Focused on essential functionality without the overhead of a full standard library.
• Educational: Ideal for learning about low-level programming and assembly language techniques.

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Installation

1. Clone the Repository:

   git clone https://github.com/yourusername/minilibc.git
   cd minilibc

2. Build the Library: Ensure you have an appropriate assembler and compiler toolchain installed.

   make

3. Include Minilibc in Your Project: Link the libasm.a archive with your application during the build process:

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

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Usage

Include the relevant headers in your C code, then call the functions as you would with the standard library:

#include "minilibc.h"

int main() {
    char str[] = "Hello, world!";
    size_t len = strlen(str);
    printf("Length: %zu\n", len);
    return 0;
}

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Roadmap

Completed

• Core functions implemented:
  • strlen, strchr, memset, strcmp, memmove, strncmp, strcasecmp, strstr, strpbrk, strcspn.

TODO

• Add Unit Testing: Implement testing using Unity to ensure function correctness.
• Release Library on GitHub: Provide pre-built binaries and documentation.
• Add SIMD Optimization: Extend functionality with libsimd for enhanced performance.