// slices — generic slice helpers, written without generics.
//
// CLAUDE.md forbids generics, so we mint per-element-type variants.
// Hare's `append` builtin is what these stand in for: each takes a
// *[]T plus an item, grows the storage if needed, and updates the
// slice header in place. The user passes `&s` because we mutate
// through the pointer.

use os;

export fn appendu8(s: *[]u8, v: u8) void = {
	if (s.len >= s.cap) {
		let nc: i32 = s.cap * 2;
		if (nc < 8) { nc = 8; };
		let np: *u8 = os.alloc(nc: u64): *u8;
		let i: i32 = 0;
		for (i < s.len) {
			np[i] = s.ptr[i];
			i += 1;
		};
		if (s.cap > 0) {
			os.free(s.ptr: *void, s.cap: u64);
		};
		s.ptr = np;
		s.cap = nc;
	};
	s.ptr[s.len] = v;
	s.len += 1;
};

export fn appendi64(s: *[]i64, v: i64) void = {
	if (s.len >= s.cap) {
		let nc: i32 = s.cap * 2;
		if (nc < 8) { nc = 8; };
		let np: *i64 = os.alloc((nc * 8): u64): *i64;
		let i: i32 = 0;
		for (i < s.len) {
			np[i] = s.ptr[i];
			i += 1;
		};
		if (s.cap > 0) {
			os.free(s.ptr: *void, (s.cap * 8): u64);
		};
		s.ptr = np;
		s.cap = nc;
	};
	s.ptr[s.len] = v;
	s.len += 1;
};