--- /dev/null
+const std = @import("std");
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) void {
+ // Standard target options allows the person running `zig build` to choose
+ // what target to build for. Here we do not override the defaults, which
+ // means any target is allowed, and the default is native. Other options
+ // for restricting supported target set are available.
+ const target = b.standardTargetOptions(.{});
+
+ // Standard optimization options allow the person running `zig build` to select
+ // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+ // set a preferred release mode, allowing the user to decide how to optimize.
+ const optimize = b.standardOptimizeOption(.{});
+
+ const exe = b.addExecutable(.{
+ .name = "lmdb",
+ // In this case the main source file is merely a path, however, in more
+ // complicated build scripts, this could be a generated file.
+ .root_source_file = .{ .path = "src/main.zig" },
+ .target = target,
+ .optimize = optimize,
+ });
+
+ exe.addIncludePath(.{ .path = "./lmdb/libraries/liblmdb" });
+
+ exe.addCSourceFiles(.{ .files = &.{
+ "./lmdb/libraries/liblmdb/midl.c",
+ "./lmdb/libraries/liblmdb/mdb.c",
+ } });
+
+ exe.linkLibC();
+
+ // This declares intent for the executable to be installed into the
+ // standard location when the user invokes the "install" step (the default
+ // step when running `zig build`).
+ b.installArtifact(exe);
+
+ // This *creates* a Run step in the build graph, to be executed when another
+ // step is evaluated that depends on it. The next line below will establish
+ // such a dependency.
+ const run_cmd = b.addRunArtifact(exe);
+
+ // By making the run step depend on the install step, it will be run from the
+ // installation directory rather than directly from within the cache directory.
+ // This is not necessary, however, if the application depends on other installed
+ // files, this ensures they will be present and in the expected location.
+ run_cmd.step.dependOn(b.getInstallStep());
+
+ // This allows the user to pass arguments to the application in the build
+ // command itself, like this: `zig build run -- arg1 arg2 etc`
+ if (b.args) |args| {
+ run_cmd.addArgs(args);
+ }
+
+ // This creates a build step. It will be visible in the `zig build --help` menu,
+ // and can be selected like this: `zig build run`
+ // This will evaluate the `run` step rather than the default, which is "install".
+ const run_step = b.step("run", "Run the app");
+ run_step.dependOn(&run_cmd.step);
+
+ // Creates a step for unit testing. This only builds the test executable
+ // but does not run it.
+ const unit_tests = b.addTest(.{
+ .root_source_file = .{ .path = "src/main.zig" },
+ .target = target,
+ .optimize = optimize,
+ });
+
+ const run_unit_tests = b.addRunArtifact(unit_tests);
+
+ // Similar to creating the run step earlier, this exposes a `test` step to
+ // the `zig build --help` menu, providing a way for the user to request
+ // running the unit tests.
+ const test_step = b.step("test", "Run unit tests");
+ test_step.dependOn(&run_unit_tests.step);
+}
--- /dev/null
+const std = @import("std");
+const lmdb = @cImport(@cInclude("lmdb.h"));
+
+const print = std.debug.print;
+
+pub fn Lmdb(comptime KeySize: comptime_int) type {
+ _ = KeySize;
+ return struct {
+ pub fn init(comptime path: []const u8) @This() {
+ var res: @This() = undefined;
+
+ _ = lmdb.mdb_env_create(&res.env);
+ // mdb_env_set_maxreaders(env, 1);
+ // mdb_env_set_maxdbs(env, 1); // named databases
+ // mdb_env_set_mapsize(env, 1024*1024);
+
+ _ = lmdb.mdb_env_open(res.env, path.ptr, 0, 0o664);
+ // /*MDB_FIXEDMAP |MDB_NOSYNC |MDB_NOSUBDIR*/
+
+ _ = lmdb.mdb_txn_begin(res.env, null, 0, &res.txn);
+ _ = lmdb.mdb_dbi_open(res.txn, null, 0, &res.dbi);
+
+ return res;
+ }
+
+ pub fn deinit(self: @This()) void {
+ _ = lmdb.mdb_txn_commit(self.txn);
+ _ = lmdb.mdb_dbi_close(self.env, self.dbi);
+ _ = lmdb.mdb_env_close(self.env);
+ }
+
+ pub fn get(self: @This(), comptime T: type, key: []const u8) ?T {
+ var k = lmdb.MDB_val{
+ .mv_data = @ptrFromInt(@intFromPtr(key.ptr)),
+ .mv_size = key.len,
+ };
+
+ var v: lmdb.MDB_val = undefined;
+
+ const res = lmdb.mdb_get(self.txn, self.dbi, &k, &v);
+
+ if (res == 0 and v.mv_size == @sizeOf(T)) {
+ if (v.mv_data) |data| {
+ return @as(*T, @ptrFromInt(@intFromPtr(data))).*;
+ }
+ }
+
+ return null;
+ }
+
+ pub fn put(self: @This(), comptime T: type, key: []const u8, val: T) void {
+ var k = lmdb.MDB_val{
+ .mv_data = @ptrFromInt(@intFromPtr(key.ptr)),
+ .mv_size = key.len,
+ };
+
+ var v = lmdb.MDB_val{
+ .mv_data = @ptrFromInt(@intFromPtr(&val)),
+ .mv_size = @sizeOf(T),
+ };
+
+ const res = lmdb.mdb_put(self.txn, self.dbi, &k, &v, 0);
+ _ = res;
+
+ // return val;
+ }
+
+ env: ?*lmdb.MDB_env,
+ dbi: lmdb.MDB_dbi,
+ txn: ?*lmdb.MDB_txn,
+ };
+}
+
+pub fn main() !void {
+ var db = Lmdb(16).init("./db");
+ defer db.deinit();
+
+ var testKey = [_]u8{0} ** 16;
+ @memcpy(testKey[0..5], "abcde");
+ // @memcpy(testKey[5..10], "abcde");
+
+ const u_1 = db.get(u8, &testKey);
+ print("u1: {?}\n", .{u_1});
+
+ var u_2 = db.get(u8, "abcde" ++ "12345");
+ db.put(u8, "abcde" ++ "12345", u_2.? + 1);
+
+ u_2 = db.get(u8, "abcde" ++ "12345");
+ print("u2: {?}\n", .{u_2});
+}
projects / ziglmdb / commitdiff