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LibCore: Define and use a fallible, OS-independent getgrent(_r) wrapper

Browse source 
Rather than maintaining a list of #ifdef guards to check systems that do
not provide the reentrant version of getgrent, we can use C++ concepts
to let the compiler perform this check for us.

While we're at it, we can also provide this wrapper as fallible to let
the caller TRY calling it.
This commit is contained in:
Timothy Flynn 2022-12-13 15:08:58 -05:00 • committed by Tim Flynn
parent 1ee808fae6
commit d09266237d
3 changed files with 61 additions and 31 deletions
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52
Userland/Libraries/LibCore/Group.cpp
View file

@ -19,32 +19,27 @@ namespace Core {
ErrorOr<DeprecatedString> Group::generate_group_file() const
{
StringBuilder builder;
char buffer[1024] = { 0 };
ScopeGuard grent_guard([] { endgrent(); });
setgrent();
errno = 0;
#ifndef AK_OS_MACOS
struct group group;
struct group* gr = nullptr;
char buffer[1024] = { 0 };
while (getgrent_r(&group, buffer, sizeof(buffer), &gr) == 0 && gr) {
#else
for (auto const* gr = getgrent(); gr; gr = getgrent()) {
#endif
if (gr->gr_name == m_name)
while (true) {
auto group = TRY(Core::System::getgrent({ buffer, sizeof(buffer) }));
if (!group.has_value())
break;
if (group->gr_name == m_name)
builder.appendff("{}:x:{}:{}\n", m_name, m_id, DeprecatedString::join(',', m_members));
else {
Vector<DeprecatedString> members;
for (size_t i = 0; gr->gr_mem[i]; ++i)
members.append(gr->gr_mem[i]);
for (size_t i = 0; group->gr_mem[i]; ++i)
members.append(group->gr_mem[i]);
builder.appendff("{}:x:{}:{}\n", gr->gr_name, gr->gr_gid, DeprecatedString::join(',', members));
builder.appendff("{}:x:{}:{}\n", group->gr_name, group->gr_gid, DeprecatedString::join(',', members));
}
}
if (errno)
return Error::from_errno(errno);
return builder.to_deprecated_string();
}
@ -123,28 +118,23 @@ ErrorOr<void> Group::add_group(Group& group)
ErrorOr<Vector<Group>> Group::all()
{
Vector<Group> groups;
char buffer[1024] = { 0 };
ScopeGuard grent_guard([] { endgrent(); });
setgrent();
errno = 0;
#ifndef AK_OS_MACOS
struct group group;
struct group* gr = nullptr;
char buffer[1024] = { 0 };
while (getgrent_r(&group, buffer, sizeof(buffer), &gr) == 0 && gr) {
#else
for (auto const* gr = getgrent(); gr; gr = getgrent()) {
#endif
while (true) {
auto group = TRY(Core::System::getgrent({ buffer, sizeof(buffer) }));
if (!group.has_value())
break;
Vector<DeprecatedString> members;
for (size_t i = 0; gr->gr_mem[i]; ++i)
members.append(gr->gr_mem[i]);
for (size_t i = 0; group->gr_mem[i]; ++i)
members.append(group->gr_mem[i]);
groups.append({ gr->gr_name, gr->gr_gid, members });
groups.append({ group->gr_name, group->gr_gid, members });
}
if (errno)
return Error::from_errno(errno);
return groups;
}