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pidof: Use ArgsParser to validate arguments

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The built in functionality of ArgsParser is now used to validate the
options given. All options are now grouped into a struct.
This commit is contained in:
Tim Ledbetter 2023-05-14 06:05:54 +01:00 committed by Andreas Kling
parent bde96640ac
commit 8be7b16c42
Notes: sideshowbarker 2024-07-16 23:57:20 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/8be7b16c42
Pull-request: https://github.com/SerenityOS/serenity/pull/18823
1 changed files with 40 additions and 31 deletions
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71
Userland/Utilities/pidof.cpp
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@ -13,22 +13,27 @@
#include <string.h>
#include <unistd.h>
static ErrorOr<int> pid_of(DeprecatedString const& process_name, bool single_shot, bool omit_pid, pid_t pid)
struct Options {
bool single_shot { false };
Optional<pid_t> pid_to_omit;
StringView process_name;
};
static ErrorOr<int> pid_of(Options const& options)
{
bool displayed_at_least_one = false;
auto all_processes = TRY(Core::ProcessStatisticsReader::get_all());
for (auto& it : all_processes.processes) {
if (it.name == process_name) {
if (!omit_pid || it.pid != pid) {
out(displayed_at_least_one ? " {}"sv : "{}"sv, it.pid);
displayed_at_least_one = true;
if (it.name != options.process_name || options.pid_to_omit == it.pid)
continue;
if (single_shot)
break;
}
}
out(displayed_at_least_one ? " {}"sv : "{}"sv, it.pid);
displayed_at_least_one = true;
if (options.single_shot)
break;
}
if (displayed_at_least_one)
@ -44,30 +49,34 @@ ErrorOr<int> serenity_main(Main::Arguments args)
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
bool single_shot = false;
StringView omit_pid_value;
StringView process_name;
Options options;
Core::ArgsParser args_parser;
args_parser.add_option(single_shot, "Only return one pid", nullptr, 's');
args_parser.add_option(omit_pid_value, "Omit the given PID, or the parent process if the special value %PPID is passed", nullptr, 'o', "pid");
args_parser.add_positional_argument(process_name, "Process name to search for", "process-name");
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Omit the given PID, or the parent process if the special value %PPID is passed",
.short_name = 'o',
.value_name = "pid",
.accept_value = [&options](auto omit_pid_value) {
if (omit_pid_value.is_empty())
return false;
if (omit_pid_value == "%PPID"sv) {
options.pid_to_omit = getppid();
return true;
}
auto number = omit_pid_value.to_uint();
if (!number.has_value())
return false;
options.pid_to_omit = number.value();
return true;
},
});
args_parser.add_option(options.single_shot, "Only return one pid", nullptr, 's');
args_parser.add_positional_argument(options.process_name, "Process name to search for", "process-name");
args_parser.parse(args);
pid_t pid_to_omit = 0;
if (!omit_pid_value.is_empty()) {
if (omit_pid_value == "%PPID"sv) {
pid_to_omit = getppid();
} else {
auto number = omit_pid_value.to_uint();
if (!number.has_value()) {
warnln("Invalid value for -o");
args_parser.print_usage(stderr, args.strings[0]);
return 1;
}
pid_to_omit = number.value();
}
}
return pid_of(process_name, single_shot, !omit_pid_value.is_empty(), pid_to_omit);
return pid_of(options);
}