hashtest.zig

hashtest.zig

const std = @import("std");
const ustreamer = @cImport({
    @cInclude("hash.c");
});
pub fn main() !void {
    // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});

    // stdout is for the actual output of your application, for example if you
    // are implementing gzip, then only the compressed bytes should be sent to
    // stdout, not any debugging messages.
    const stdout_file = std.io.getStdOut().writer();
    var bw = std.io.bufferedWriter(stdout_file);
    const stdout = bw.writer();

    try stdout.print("Run `zig build test` to run the tests.\n", .{});

    try bw.flush(); // don't forget to flush!
    _ = ustreamer.main1();
}

test "simple test" {
    var list = std.ArrayList(i32).init(std.testing.allocator);
    defer list.deinit(); // try commenting this out and see if zig detects the memory leak!
    try list.append(42);
    try std.testing.expectEqual(@as(i32, 42), list.pop());
}
test "c1" {
    // hashtable_t *ht = ht_create(1024);
    // ht_put(ht, "foo", "bar");
    // printf("%s\n", (char*)ht_get(ht, "foo"));
    var ht = ustreamer.ht_create(1024);
    // var x: [*c]u8 = "foo";
    // var y: [*c]u8 = "bar";
    // var ff = "foo";
    // var bb = "bar";
    // var fp = ff[0..];
    // var bp = bb[0..];
    // const x: [*c]const u8 = "some c string";
    // const y: [*c]const u8 = "some c string";

    // const as_ptr: [*:0]const u8 = x;
    // _ = as_ptr;
    var x = "foo".*;
    var y = "bar".*;
    _ = ustreamer.ht_put(ht, &x, &y); //ff, bb); // fp, bp); //, bb.ptr); //ff, bb);
    if (ustreamer.ht_get(ht, &x)) |s| {
        var anyopaque_pointer: *anyopaque = s;  
        // var item_count: usize = 3;

        var result = @as([*:0]u8, @ptrCast(anyopaque_pointer)); //[0..item_count];
        // while(s)
        std.debug.print("{s}", .{result});
        // var us: usize = 3;
        // try std.testing.expectEqual(std.mem.eql(u8, result, "bar"), true);
    }
}
// 从zig传递字符串到c，是比较曲折的，从c返回的字符串转换为zig的，就更加曲折了。
// 就像它描述的一样：Transferring Zig String Literal to C: A Guide
// + How do I pass a string to a C function expecting char *
// + C code that uses string literals as non-const char *
// 相当曲折的过程：https://stackoverflow.com/questions/72607441/how-can-i-pass-a-zig-string-literal-to-c
// 想不到这个解决方法是管用的：https://stackoverflow.com/questions/74491882/how-can-i-cast-anyopaque-to-const-u8
// 我的方案比它更进一步，但是确实是借鉴它的做法的