Created
May 11, 2025 06:14
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Ben Olmstead's Malbolge language (1998) implementation in Zig language; kinda translated C implementation into Zig
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| const std = @import("std"); | |
| pub const xlat1 = | |
| "+b(29e*j1VMEKLyC})8&m#~W>qxdRp0wkrUo[D7,XTcA\"lI" | |
| ++ ".v%{gJh4G\\-=O@5`_3i<?Z';FNQuY]szf$!BS/|t:Pn6^Ha"; | |
| pub const xlat2 = | |
| "5z]&gqtyfr$(we4{WP)H-Zn,[%\\3dL+Q;>U!pJS72FhOA1C" | |
| ++ "B6v^=I_0/8|jsb9m<.TVac`uY*MK'X~xDl}REokN:#?G\"i@"; | |
| pub fn main() !void { | |
| // WONTFIX: POSIX only | |
| var args = std.process.ArgIterator.init(); | |
| _ = args.next(); | |
| const arg1 = args.next() orelse return error.InvalidCommandLine; | |
| var i: u16 = 0; | |
| var mem: [59049]u16 = undefined; | |
| { | |
| var f = try std.fs.cwd().openFile(arg1, .{}); | |
| defer f.close(); | |
| while (f.reader().any().readByte()) |x| { | |
| if (std.ascii.isWhitespace(x)) continue; | |
| if (x < 127 and x > 32) { | |
| _ = std.mem.indexOfScalar(u8, "ji*p</vo", xlat1[(x-33+i)%94]) | |
| orelse return error.InvalidCharacterInSourceCode; | |
| } | |
| if (i == 59049) return error.InputFileTooLong; | |
| mem[i] = x; | |
| i += 1; | |
| } else |e| { | |
| if (e != error.EndOfStream) return e; | |
| } | |
| } | |
| while (i < 59049) : (i+=1) | |
| mem[i] = op(mem[i-1], mem[i-2]); | |
| exec(&mem); | |
| } | |
| pub fn exec(mem: *[59049]u16) void { | |
| var a: u16 = 0; | |
| var c: u16 = 0; | |
| var d: u16 = 0; | |
| while (true) { | |
| if (mem[c] < 33 or mem[c] > 126) continue; | |
| switch ( xlat1[(mem[c]-33+c)%94] ) { | |
| 'j' => { d = mem[d]; }, | |
| 'i' => { c = mem[d]; }, | |
| '*' => { | |
| mem[d] = mem[d]/3 + mem[d]%3 * 19683; | |
| a = mem[d]; | |
| }, | |
| 'p' => { | |
| mem[d] = op(a, mem[d]); | |
| a = mem[d]; | |
| }, | |
| '<' => { | |
| _ = &std.io.getStdOut() | |
| .writer().any().writeByte(@intCast(a&0xff)); | |
| }, | |
| '/' => { | |
| a = std.io.getStdIn().reader().any().readByte() | |
| catch 59048; | |
| }, | |
| 'v' => return, | |
| else => {}, | |
| } | |
| mem[c] = xlat2[mem[c]-33]; | |
| c = if (c==59048) 0 else c + 1; | |
| d = if (d==59048) 0 else d + 1; | |
| } | |
| } | |
| pub fn op(x: u16, y: u16) u16 { | |
| var i: u16 = 0; | |
| const p9: [5]u16 = .{ 1, 9, 81, 729, 6561 }; | |
| const o: [9][9]u16 = | |
| .{ | |
| .{ 4, 3, 3, 1, 0, 0, 1, 0, 0 }, | |
| .{ 4, 3, 5, 1, 0, 2, 1, 0, 2 }, | |
| .{ 5, 5, 4, 2, 2, 1, 2, 2, 1 }, | |
| .{ 4, 3, 3, 1, 0, 0, 7, 6, 6 }, | |
| .{ 4, 3, 5, 1, 0, 2, 7, 6, 8 }, | |
| .{ 5, 5, 4, 2, 2, 1, 8, 8, 7 }, | |
| .{ 7, 6, 6, 7, 6, 6, 4, 3, 3 }, | |
| .{ 7, 6, 8, 7, 6, 8, 4, 3, 5 }, | |
| .{ 8, 8, 7, 8, 8, 7, 5, 5, 4 }, | |
| }; | |
| for (0..5) |j| | |
| i += o[y/p9[j]%9][x/p9[j]%9]*p9[j]; | |
| return i; | |
| } |
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