refacto: vide-coding to get a terminal look

content/projects/systems.md

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+# Systems Programming Projects
+
+Low-level work: operating systems, compilers, networking, and performance engineering.
+
+---
+
+## Tiny HTTP/1.1 Server (C)
+
+A from-scratch HTTP server written in C that handles concurrent connections using `epoll` on Linux.
+
+**What it does:**
+
+- Serves static files with correct MIME types
+- Handles `keep-alive` connections
+- Parses request headers manually (no third-party parser)
+- ~1,200 lines of C — intentionally minimal
+
+**Interesting problems solved:**
+
+- Non-blocking I/O with an event loop
+- Incremental parsing of chunked request bodies
+- Safe path traversal (no `../` escapes from the document root)
+
+---
+
+## Shell Implementation (C)
+
+A POSIX-compatible shell (`mysh`) supporting pipelines, redirections, background jobs, and a small built-in set.
+
+**Supported features:**
+
+- Pipelines: `cmd1 | cmd2 | cmd3`
+- I/O redirections: `>`, `>>`, `<`, `2>`
+- Background jobs: `cmd &`
+- Job control: `fg`, `bg`, `jobs`
+- Signal handling (SIGINT, SIGTSTP, SIGHUP)
+
+**Focus areas:** `fork/exec` model, `waitpid`, file descriptor management, signal masking.
+
+---
+
+## Memory Allocator
+
+A drop-in `malloc` replacement using `mmap`-backed free lists with coalescing.
+
+**Algorithms implemented:**
+
+- First-fit and best-fit strategies (switchable at compile time)
+- Boundary-tag coalescing to reduce fragmentation
+- Thread-local caches for small allocations (reduces lock contention)
+
+**Benchmarked** against `glibc malloc` on synthetic workloads — within 2× for mixed-size allocations.
+
+---
+
+## Bytecode Interpreter (Python → C)
+
+A small virtual machine that executes a simple bytecode format, written in C. The front-end compiler is written in Python and produces `.bco` files.
+
+**VM features:**
+
+- Stack-based architecture (inspired by CPython)
+- 30 opcodes: arithmetic, comparisons, jumps, function calls, closures
+- Mark-and-sweep garbage collector
+- Disassembler for debugging (`--disasm` flag)
+
+---
+
+*Press Q or ESC to return.*