71 lines
1.8 KiB
Zig
71 lines
1.8 KiB
Zig
const std = @import("std");
|
|
const shell = @import("shell.zig");
|
|
|
|
const Allocator = std.mem.Allocator;
|
|
|
|
pub const PackedUserSize = @sizeOf(PackedUser);
|
|
pub const PackedUser = packed struct {
|
|
uid: u32,
|
|
gid: u32,
|
|
additional_gids_offset: u29,
|
|
shell_here: u1,
|
|
shell_len_or_place: u6,
|
|
homedir_len: u6,
|
|
username_is_a_suffix: u1,
|
|
username_offset_or_len: u5,
|
|
gecos_len: u8,
|
|
};
|
|
|
|
pub const User = struct {
|
|
uid: u32,
|
|
gid: u32,
|
|
name: []const u8,
|
|
gecos: []const u8,
|
|
home: []const u8,
|
|
shell: []const u8,
|
|
};
|
|
|
|
// UserWriter accepts a naive User struct and returns a PackedUser
|
|
pub const UserWriter = struct {
|
|
allocator: Allocator,
|
|
|
|
pub fn init(allocator: Allocator) UserWriter {
|
|
return UserWriter{
|
|
.allocator = allocator,
|
|
};
|
|
}
|
|
|
|
pub fn fromUser(user: User, shellw: shell.ShellWriter) !PackedUser {
|
|
var shell_here: u1 = undefined;
|
|
var shell_len_or_place: u6 = undefined;
|
|
if (shellw.getIndex(user.shell)) |idx| {
|
|
shell_here = false;
|
|
shell_len_or_place = idx;
|
|
} else {
|
|
shell_here = true;
|
|
shell_len_or_place = user.shell.len;
|
|
}
|
|
|
|
var puser = PackedUser{
|
|
.uid = user.uid,
|
|
.gid = user.gid,
|
|
.additional_gids_offset = 0, // second pass
|
|
.shell_here = shell_here,
|
|
.shell_len_or_place = shell_len_or_place,
|
|
.homedir_len = undefined,
|
|
.username_is_a_suffix = undefined,
|
|
.username_offset_or_len = undefined,
|
|
.gecos_len = undefined,
|
|
};
|
|
|
|
_ = shellw;
|
|
return puser;
|
|
}
|
|
};
|
|
|
|
const testing = std.testing;
|
|
|
|
test "PackedUser is byte-aligned" {
|
|
try testing.expectEqual(0, @rem(@bitSizeOf(PackedUser), 8));
|
|
}
|