starting with sections
This commit is contained in:
Motiejus Jakštys
parent
40deb3f0be
commit
3eec9a3274
@ -8,7 +8,13 @@ const mem = std.mem;
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const Allocator = mem.Allocator;
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const ArrayList = std.ArrayList;
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const Group = struct {
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pub const Group = struct {
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gid: u32,
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name: []const u8,
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members: std.BufSet,
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};
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const GroupStored = struct {
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gid: u32,
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name: []const u8,
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members_offset: u32,
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@ -92,7 +98,7 @@ const PackedGroup = struct {
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pub fn packTo(
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arr: *ArrayList(u8),
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group: Group,
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group: GroupStored,
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) packErr!void {
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const groupname_len = try validate.downCast(u5, group.name.len - 1);
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@ -121,13 +127,13 @@ test "construct PackedGroups" {
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var buf = ArrayList(u8).init(testing.allocator);
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defer buf.deinit();
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const groups = [_]Group{
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Group{
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const groups = [_]GroupStored{
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.{
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.gid = 1000,
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.name = "sudo",
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.members_offset = 1,
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},
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Group{
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.{
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.gid = std.math.maxInt(u32),
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.name = "Name" ** 8, // 32
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.members_offset = std.math.maxInt(u32),
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221
src/sections.zig
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221
src/sections.zig
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@ -0,0 +1,221 @@
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const std = @import("std");
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const unicode = std.unicode;
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const sort = std.sort;
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const Allocator = std.mem.Allocator;
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const ArrayList = std.ArrayList;
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const StringHashMap = std.StringHashMap;
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const AutoHashMap = std.AutoHashMap;
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const BufSet = std.BufSet;
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const pad = @import("padding.zig");
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const userImport = @import("user.zig");
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const groupImport = @import("group.zig");
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const User = userImport.User;
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const Group = groupImport.Group;
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const Corpus = struct {
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allocator: Allocator,
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// sorted by name, by unicode codepoint
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users: []User,
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// sorted by gid
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groups: []Group,
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// pointing to `users` and `groups` slices above.
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name2user: StringHashMap(*const User),
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uid2user: AutoHashMap(u32, *const User),
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name2group: StringHashMap(*const Group),
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gid2group: AutoHashMap(u32, *const Group),
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groupname2users: StringHashMap(ArrayList(*const User)),
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username2groups: StringHashMap(ArrayList(*const Group)),
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pub const initErr = Allocator.Error ||
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error{InvalidUtf8} ||
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error{Duplicate} ||
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error{NotFound};
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pub fn init(
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allocator: Allocator,
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usersConst: []const User,
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groupsConst: []const Group,
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) initErr!Corpus {
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var users = try allocator.alloc(User, usersConst.len);
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var groups = try allocator.alloc(Group, groupsConst.len);
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std.mem.copy(User, users, usersConst);
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std.mem.copy(Group, groups, groupsConst);
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sort.sort(User, users, {}, cmpUser);
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sort.sort(Group, groups, {}, cmpGroup);
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var name2user = StringHashMap(*const User).init(allocator);
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var uid2user = AutoHashMap(u32, *const User).init(allocator);
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var name2group = StringHashMap(*const Group).init(allocator);
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var gid2group = AutoHashMap(u32, *const Group).init(allocator);
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for (users) |user| {
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var res1 = try name2user.getOrPut(user.name);
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if (res1.found_existing) {
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return error.Duplicate;
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}
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res1.value_ptr.* = &user;
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var res2 = try uid2user.getOrPut(user.uid);
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if (res2.found_existing) {
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return error.Duplicate;
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}
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res2.value_ptr.* = &user;
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}
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for (groups) |group| {
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var res1 = try name2group.getOrPut(group.name);
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if (res1.found_existing) {
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return error.Duplicate;
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}
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res1.value_ptr.* = &group;
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var res2 = try gid2group.getOrPut(group.gid);
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if (res2.found_existing) {
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return error.Duplicate;
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}
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res2.value_ptr.* = &group;
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}
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var groupname2users = StringHashMap(ArrayList(*const User)).init(allocator);
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var username2groups = StringHashMap(ArrayList(*const Group)).init(allocator);
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for (groups) |group| {
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const cnt = group.members.count();
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var members = try ArrayList(*const User).initCapacity(allocator, cnt);
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var it = group.members.iterator();
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while (it.next()) |memberName| {
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if (name2user.get(memberName.*)) |user| {
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members.appendAssumeCapacity(user);
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} else {
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return error.NotFound;
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}
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var groupUsers: ArrayList(*const Group) = undefined;
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var result = try username2groups.getOrPut(memberName.*);
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if (result.found_existing) {
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groupUsers = ArrayList(*const Group).init(allocator);
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result.value_ptr.* = groupUsers;
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} else {
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groupUsers = result.value_ptr.*;
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}
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try groupUsers.append(&group);
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}
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var result = try groupname2users.getOrPut(group.name);
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if (result.found_existing) {
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return error.Duplicate;
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}
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result.value_ptr.* = members;
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}
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return Corpus{
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.allocator = allocator,
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.users = users,
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.groups = groups,
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.name2user = name2user,
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.uid2user = uid2user,
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.name2group = name2group,
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.gid2group = gid2group,
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.groupname2users = groupname2users,
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.username2groups = username2groups,
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};
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}
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};
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// cmpUser compares two users for sorting. By username's utf8 codepoints, ascending.
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fn cmpUser(_: void, a: User, b: User) bool {
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var utf8_a = (unicode.Utf8View.init(a.name) catch unreachable).iterator();
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var utf8_b = (unicode.Utf8View.init(b.name) catch unreachable).iterator();
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while (utf8_a.nextCodepoint()) |codepoint_a| {
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if (utf8_b.nextCodepoint()) |codepoint_b| {
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if (codepoint_a != codepoint_b) {
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return codepoint_a < codepoint_b;
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}
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} else {
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// a is a prefix of b. It is thus shorter.
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return false;
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}
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}
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// b is a prefix of a
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return true;
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}
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fn cmpGroup(_: void, a: Group, b: Group) bool {
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return a.gid < b.gid;
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}
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const testing = std.testing;
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fn someMembers(allocator: Allocator, members: []const []const u8) !BufSet {
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var bufset = BufSet.init(allocator);
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for (members) |member| {
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try bufset.insert(member);
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}
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return bufset;
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}
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test "test corpus" {
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const allocator = testing.allocator;
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var users = [_]User{ User{
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.uid = 1000,
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.gid = 1000,
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.name = "vidmantas",
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.gecos = "Vidmantas Kaminskas",
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.home = "/home/vidmantas",
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.shell = "/bin/bash",
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}, User{
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.uid = 0,
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.gid = std.math.maxInt(u32),
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.name = "Name" ** 8,
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.gecos = "Gecos" ** 51,
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.home = "Home" ** 16,
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.shell = "She.LllL" ** 8,
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}, User{
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.uid = 1002,
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.gid = 1002,
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.name = "svc-bar",
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.gecos = "",
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.home = "/",
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.shell = "/",
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} };
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var groups = [_]Group{ Group{
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.gid = 1000,
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.name = "vidmantas",
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.members = try someMembers(allocator, &[_][]const u8{"vidmantas"}),
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}, Group{
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.gid = 1234,
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.name = "service-account",
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.members = try someMembers(allocator, &[_][]const u8{ "svc-bar", "Name" ** 8 }),
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}, Group{
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.gid = 9999,
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.name = "empty",
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.members = try someMembers(allocator, &[_][]const u8{}),
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} };
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const corpus = try Corpus.init(allocator, users[0..], groups[0..]);
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try testing.expectEqualStrings(corpus.users[0].name, "svc-bar");
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try testing.expectEqualStrings(corpus.users[1].name, "vidmantas");
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try testing.expectEqualStrings(corpus.users[2].name, "Name" ** 8);
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}
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fn testUser(name: []const u8) User {
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var result = std.mem.zeroes(User);
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result.name = name;
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return result;
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}
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test "users compare function" {
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const a = testUser("a");
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const b = testUser("b");
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const bb = testUser("bb");
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try testing.expect(cmpUser({}, a, b));
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try testing.expect(!cmpUser({}, b, a));
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try testing.expect(cmpUser({}, a, bb));
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try testing.expect(!cmpUser({}, bb, a));
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try testing.expect(cmpUser({}, b, bb));
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try testing.expect(!cmpUser({}, bb, b));
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}
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20
src/so.zig
Normal file
20
src/so.zig
Normal file
@ -0,0 +1,20 @@
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const Passwd = extern struct {
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// zig fmt: off
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pw_name: [*:0]u8, // username
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pw_passwd: [*:0]const u8, // user password, always '*'
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pw_uid: u32, // user ID
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pw_gid: u32, // group ID
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pw_gecos: [*:0]const u8, // user information
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pw_dir: [*:0]const u8, // home directory
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pw_shell: [*:0]const u8, // shell program
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// zig fmt: on
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};
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const Group = extern struct {
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// zig fmt: off
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gr_name: [*:0]u8, // group name
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gr_passwd: [*:0]u8, // group password, always '*'
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gr_gid: u32, // group ID
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gr_mem: [*:0][*:0] const u8, // NULL-terminated array of pointers to group members
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// zig fmt: off
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};
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@ -1,7 +1,9 @@
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test "turbonss test suite" {
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_ = @import("main.zig");
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_ = @import("shell.zig");
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_ = @import("header.zig");
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_ = @import("so.zig");
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_ = @import("sections.zig");
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_ = @import("shell.zig");
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_ = @import("user.zig");
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_ = @import("group.zig");
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_ = @import("validate.zig");
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