Use include <cstring> and std::memcpy etc

style.md

@@ -22,6 +22,39 @@ This document describes the C++ coding style used in the WeaselDB project. These
 - Use modern C++ features: RAII, move semantics, constexpr, concepts where appropriate
 - Prefer standard library containers and algorithms over custom implementations
 
+### C Library Functions and Headers
+- **Always use std:: prefixed versions** of C library functions for consistency and clarity
+- **Use C++ style headers** (`<cstring>`, `<cstdlib>`, etc.) instead of C style headers (`<string.h>`, `<stdlib.h>`, etc.)
+- This applies to all standard libc functions: `std::abort()`, `std::fprintf()`, `std::free()`, `std::memcpy()`, `std::strlen()`, `std::strncpy()`, `std::memset()`, `std::signal()`, etc.
+- Exception: Functions with no std:: equivalent (e.g., `perror()`, `gai_strerror()`) and system-specific headers (e.g., `<unistd.h>`, `<fcntl.h>`)
+```cpp
+// Preferred - C++ style
+#include <cstring>
+#include <cstdlib>
+#include <csignal>
+std::abort();
+std::fprintf(stderr, "Error message\n");
+std::free(ptr);
+std::memcpy(dest, src, size);
+std::strlen(str);
+std::strncpy(dest, src, n);
+std::memset(ptr, value, size);
+std::signal(SIGTERM, handler);
+
+// Avoid - C style
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+abort();
+fprintf(stderr, "Error message\n");
+free(ptr);
+memcpy(dest, src, size);
+strlen(str);
+strncpy(dest, src, n);
+memset(ptr, value, size);
+signal(SIGTERM, handler);
+```
+
 ### Data Types
 - **Almost always signed** - prefer `int`, `int64_t`, `size_t` over unsigned types except for:
   - Bit manipulation operations