113 lines
3.4 KiB
Zig
113 lines
3.4 KiB
Zig
const std = @import("std");
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pub fn loadFromStream(alloc: *std.mem.Allocator, stream: *std.fs.File.InStream.Stream) anyerror![]i32 {
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var program = try alloc.alloc(i32, 1024);
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var buf = [_]u8{0} ** 255;
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var i: u32 = 0;
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while (try stream.readUntilDelimiterOrEof(&buf, ',')) |num| {
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var trimmed = std.mem.trimRight(u8, num, "\r\n");
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program[i] = try std.fmt.parseInt(i32, trimmed, 10);
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std.debug.warn("{},", program[i]);
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i += 1;
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}
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std.debug.warn("\n");
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return program[0..program.len];
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}
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pub fn loadFromStdIn(alloc: *std.mem.Allocator) anyerror![]i32 {
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const file = std.io.getStdIn();
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const stream = &file.inStream().stream;
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return loadFromStream(alloc, stream);
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}
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pub fn run(program: []i32) void {
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// Initial program state
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var ip: u32 = 0;
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var exit: bool = false;
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// TODO: create a nice struct
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while (!exit) {
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// std.debug.warn(" IP {d:4}: ", ip);
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const opcode = switch (program[ip]) {
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1 => {
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var a = program[@intCast(usize, program[ip + 1])];
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var b = program[@intCast(usize, program[ip + 2])];
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var dest = program[ip + 3];
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var result = a + b;
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// std.debug.warn("ADD: [{}] + [{}] => {} : {} + {} = {} => {}\n", ip + 1, ip + 2, dest, a, b, result, dest);
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program[@intCast(usize, dest)] = result;
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ip += 4;
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},
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2 => {
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var a = program[@intCast(usize, program[ip + 1])];
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var b = program[@intCast(usize, program[ip + 2])];
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var dest = program[ip + 3];
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var result = a * b;
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// std.debug.warn("MULT: [{}] + [{}] => {} : {} + {} = {} => {}\n", ip + 1, ip + 2, dest, a, b, result, dest);
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program[@intCast(usize, dest)] = result;
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ip += 4;
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},
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99 => {
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// std.debug.warn("EXIT\n");
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exit = true;
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},
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else => {
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std.debug.warn("Unknown opcode at IP {}: {}", ip, program[ip]);
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exit = true;
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},
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};
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}
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}
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const assert = std.debug.assert;
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test "day 2 example 1" {
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var before: [12]i32 = .{ 1, 9, 10, 3, 2, 3, 11, 0, 99, 30, 40, 50 };
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var after: [12]i32 = .{ 3500, 9, 10, 70, 2, 3, 11, 0, 99, 30, 40, 50 };
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run(before[0..before.len]);
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assert(std.mem.eql(i32, before[0..before.len], after[0..after.len]));
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}
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test "day 2 example 2" {
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var before: [5]i32 = .{ 1, 0, 0, 0, 99 };
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var after: [5]i32 = .{ 2, 0, 0, 0, 99 };
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run(before[0..before.len]);
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assert(std.mem.eql(i32, before[0..before.len], after[0..after.len]));
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}
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test "day 2 example 3" {
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var before: [5]i32 = .{ 2, 3, 0, 3, 99 };
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var after: [5]i32 = .{ 2, 3, 0, 6, 99 };
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run(before[0..before.len]);
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assert(std.mem.eql(i32, before[0..before.len], after[0..after.len]));
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}
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test "day 2 example 4" {
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var before: [6]i32 = .{ 2, 4, 4, 5, 99, 0 };
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var after: [6]i32 = .{ 2, 4, 4, 5, 99, 9801 };
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run(before[0..before.len]);
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assert(std.mem.eql(i32, before[0..before.len], after[0..after.len]));
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}
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test "day 2 example 5" {
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var before: [9]i32 = .{ 1, 1, 1, 4, 99, 5, 6, 0, 99 };
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var after: [9]i32 = .{ 30, 1, 1, 4, 2, 5, 6, 0, 99 };
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run(before[0..before.len]);
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assert(std.mem.eql(i32, before[0..before.len], after[0..after.len]));
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}
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