Rebuild. C Standard Library (C language)
Overview
A custom implementation of core C standard library functionality, written from scratch in C.
Serves as the foundational library for all subsequent C-based projects.
Source Code
Purpose
- Reimplement standard C library primitives to understand their exact behavior
- Build a reliable, reusable base for systems-level development
- Practice disciplined memory management and low-level API design
Technical Highlights
- Memory manipulation (
memcpy,memmove,calloc,realloc) - String handling and parsing utilities
- Character classification and conversion
- Numeric conversions (
atoi,itoa, base conversion) - File-descriptor-based I/O helpers
- Custom implementations of:
printf(formatted output)get_next_line(line-by-line file reading)
Design Notes
- Matches standard C library semantics, including edge cases
- Explicit memory ownership and error handling
- No external dependencies beyond libc
- Extended with helper utilities reused in larger projects (shell, web server)
Outcome
- Stable, reusable library used across all C projects
- Deep familiarity with undefined behavior and memory edge cases
- Strong foundation for debugging, security research, and low-level development