65 lines
1.5 KiB
Zig
65 lines
1.5 KiB
Zig
const std = @import("std");
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const testing = std.testing;
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const c = @cImport({
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@cInclude("erl_nif.h");
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});
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// https://andrealeopardi.com/posts/using-c-from-elixir-with-nifs/
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export fn fast_compare(
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env: ?*c.ErlNifEnv,
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argc: c_int,
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argv: [*c]const c.ERL_NIF_TERM,
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) c.ERL_NIF_TERM {
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// cool stuff here
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var a: c_int = undefined;
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var b: c_int = undefined;
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var res: c_int = undefined;
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_ = c.enif_get_int(env, argv[0], &a);
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_ = c.enif_get_int(env, argv[1], &b);
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if (a == b) {
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res = 0;
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} else {
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if (a > b) {
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res = 1;
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} else {
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res = -1;
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}
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}
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return c.enif_make_int(env, res);
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}
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// this can't be saved
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// i hand-translated the ERL_NIF_INIT macro manually, still reached some
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// bad spots.
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var nif_funcs = []c.ErlNifFunc{c.ErlNifFunc{
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.name = c"fast_compare",
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.arity = 2,
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.fptr = fast_compare,
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.flags = 0,
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}};
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export fn nif_init() *c.ErlNifEntry {
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comptime var entry: c.ErlNifEntry = c.ErlNifEntry{
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.major = 10,
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.minor = 4,
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.name = c"Elixir.FastCompare",
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.num_of_funcs = nif_funcs.len,
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.funcs = @ptrCast([*c]c.ErlNifFunc, &nif_funcs),
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.load = null,
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.reload = null,
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.upgrade = null,
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.unload = null,
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.vm_variant = c"beam.vanilla",
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.options = 1,
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.sizeof_ErlNifResourceTypeInit = @sizeOf(c.ErlNifResourceTypeInit),
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.min_erts = c"erts-10.4",
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};
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return &entry;
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}
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