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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringUtils.h>
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#include <LibCore/Account.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <alloca.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <unistd.h>
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static int print_id_objects(Core::Account const&);
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static bool flag_print_uid = false;
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static bool flag_print_gid = false;
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static bool flag_print_name = false;
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static bool flag_print_gid_all = false;
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static ByteString user_str;
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::unveil("/etc/passwd", "r"));
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TRY(Core::System::unveil("/etc/group", "r"));
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TRY(Core::System::unveil(nullptr, nullptr));
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TRY(Core::System::pledge("stdio rpath"));
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Core::ArgsParser args_parser;
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args_parser.add_option(flag_print_uid, "Print UID", nullptr, 'u');
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args_parser.add_option(flag_print_gid, "Print GID", nullptr, 'g');
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args_parser.add_option(flag_print_gid_all, "Print all GIDs", nullptr, 'G');
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args_parser.add_option(flag_print_name, "Print name", nullptr, 'n');
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args_parser.add_positional_argument(user_str, "User name/UID to query", "USER", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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if (flag_print_name && !(flag_print_uid || flag_print_gid || flag_print_gid_all)) {
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warnln("cannot print only names or real IDs in default format");
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return 1;
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}
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if (flag_print_uid + flag_print_gid + flag_print_gid_all > 1) {
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warnln("cannot print \"only\" of more than one choice");
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return 1;
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}
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Optional<Core::Account> account;
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if (!user_str.is_empty()) {
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if (auto user_id = user_str.to_number<uid_t>(); user_id.has_value())
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account = TRY(Core::Account::from_uid(user_id.value(), Core::Account::Read::PasswdOnly));
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else
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account = TRY(Core::Account::from_name(user_str, Core::Account::Read::PasswdOnly));
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} else {
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account = TRY(Core::Account::self(Core::Account::Read::PasswdOnly));
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}
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return print_id_objects(account.value());
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}
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static bool print_uid_object(Core::Account const& account)
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{
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if (flag_print_name)
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out("{}", account.username());
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else
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out("{}", account.uid());
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return true;
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}
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static bool print_gid_object(Core::Account const& account)
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{
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if (flag_print_name) {
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struct group* gr = getgrgid(account.gid());
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out("{}", gr ? gr->gr_name : "n/a");
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} else
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out("{}", account.gid());
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return true;
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}
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static bool print_gid_list(Core::Account const& account)
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{
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auto& extra_gids = account.extra_gids();
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auto extra_gid_count = extra_gids.size();
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for (size_t g = 0; g < extra_gid_count; ++g) {
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auto gid = extra_gids[g];
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auto* gr = getgrgid(gid);
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if (flag_print_name && gr)
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out("{}", gr->gr_name);
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else
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out("{}", gid);
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if (g != extra_gid_count - 1)
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out(" ");
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}
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return true;
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}
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static bool print_full_id_list(Core::Account const& account)
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{
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auto uid = account.uid();
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auto gid = account.gid();
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struct passwd* pw = getpwuid(uid);
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struct group* gr = getgrgid(gid);
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out("uid={}({}) gid={}({})", uid, pw ? pw->pw_name : "n/a", gid, gr ? gr->gr_name : "n/a");
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for (auto extra_gid : account.extra_gids()) {
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auto* gr = getgrgid(extra_gid);
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if (gr)
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out(" {}({})", extra_gid, gr->gr_name);
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else
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out(" {}", extra_gid);
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}
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return true;
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}
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static int print_id_objects(Core::Account const& account)
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{
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if (flag_print_uid) {
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if (!print_uid_object(account))
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return 1;
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} else if (flag_print_gid) {
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if (!print_gid_object(account))
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return 1;
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} else if (flag_print_gid_all) {
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if (!print_gid_list(account))
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return 1;
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} else {
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if (!print_full_id_list(account))
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return 1;
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}
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outln();
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return 0;
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}
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