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turbo-getent group implementation (no tests)

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Motiejus Jakštys 2022-07-12 12:55:46 +03:00
parent d2407685a0
commit c4e8f1f02c
1 changed files with 25 additions and 3 deletions
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28
src/turbo-getent.zig
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@ -5,6 +5,7 @@ const mem = std.mem;
const fmt = std.fmt; const fmt = std.fmt;
const ArrayList = std.ArrayList; const ArrayList = std.ArrayList;
const compress = @import("compress.zig");
const flags = @import("flags.zig"); const flags = @import("flags.zig");
const DB = @import("DB.zig"); const DB = @import("DB.zig");
const File = @import("File.zig"); const File = @import("File.zig");
@ -148,8 +149,29 @@ fn group(stdout: anytype, db: *const DB, keys: []const [*:0]const u8) u8 {
continue; continue;
}; };
// not converting to Group to avoid memory allocations. // not converting to Group to save a few memory allocations.
stdout.print("{s}:x:{d}:", .{ g.name(), g.gid() }) catch return 3; stdout.print("{s}:x:{d}:", .{ g.name(), g.gid() }) catch return 3;
// TODO: move member iteration from here and DB.packCGroup
// to a common place.
const members_slice = db.groupmembers[g.members_offset..];
var vit = compress.varintSliceIteratorMust(members_slice);
var it = compress.deltaDecompressionIterator(&vit);
// lines will be buffered, but flushed on every EOL.
var line_writer = io.BufferedWriter(65536, @TypeOf(stdout)){
.unbuffered_writer = stdout,
};
var i: usize = 0;
while (it.nextMust()) |member_offset| : (i += 1) {
const puser = PackedUser.fromBytes(db.users[member_offset << 3 ..]);
const name = puser.user.name();
if (i != 0)
_ = line_writer.write(",") catch return 3;
_ = line_writer.write(name) catch return 3;
}
_ = line_writer.write("\n") catch return 3;
line_writer.flush() catch return 3;
} }
return if (some_notfound) 2 else 0; return if (some_notfound) 2 else 0;
@ -163,7 +185,7 @@ fn group_all(stdout: anytype, db: *const DB) u8 {
const testing = std.testing; const testing = std.testing;
test "passwd" { test "turbo-getent passwd" {
var tf = try File.TestDB.init(testing.allocator); var tf = try File.TestDB.init(testing.allocator);
defer tf.deinit(); defer tf.deinit();
var stdout = ArrayList(u8).init(testing.allocator); var stdout = ArrayList(u8).init(testing.allocator);
@ -193,7 +215,7 @@ test "passwd" {
} }
} }
test "passwd_all" { test "turbo-getent passwd_all" {
var tf = try File.TestDB.init(testing.allocator); var tf = try File.TestDB.init(testing.allocator);
defer tf.deinit(); defer tf.deinit();
var stdout = ArrayList(u8).init(testing.allocator); var stdout = ArrayList(u8).init(testing.allocator);