banan-os/userspace/ls/main.cpp

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#include <BAN/Sort.h>
#include <BAN/String.h>
#include <BAN/Time.h>
#include <BAN/Vector.h>
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#include <dirent.h>
#include <fcntl.h>
#include <pwd.h>
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#include <stdio.h>
#include <sys/stat.h>
struct config_t
{
bool list = false;
bool all = false;
bool directory = false;
};
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struct simple_entry_t
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{
BAN::String name;
struct stat st;
};
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struct full_entry_t
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{
BAN::String access;
BAN::String hard_links;
BAN::String owner_name;
BAN::String owner_group;
BAN::String size;
BAN::String month;
BAN::String day;
BAN::String time;
BAN::String full_name;
};
const char* entry_color(mode_t mode)
{
// TODO: handle suid, sgid, sticky
if (S_ISFIFO(mode) || S_ISCHR(mode) || S_ISBLK(mode))
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return "\e[33m";
if (S_ISDIR(mode))
return "\e[34m";
if (S_ISSOCK(mode))
return "\e[35m";
if (S_ISLNK(mode))
return "\e[36m";
if (mode & (S_IXUSR | S_IXGRP | S_IXOTH))
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return "\e[32m";
return "\e[0m";
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}
BAN::String build_access_string(mode_t mode)
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{
BAN::String access;
MUST(access.resize(10));
access[0] = S_ISBLK(mode) ? 'b' : S_ISCHR(mode) ? 'c' : S_ISDIR(mode) ? 'd' : S_ISFIFO(mode) ? 'f' : S_ISLNK(mode) ? 'l' : S_ISSOCK(mode) ? 's' : '-';
access[1] = (mode & S_IRUSR) ? 'r' : '-';
access[2] = (mode & S_IWUSR) ? 'w' : '-';
access[3] = (mode & S_ISUID) ? ((mode & S_IXUSR) ? 's' : 'S') : (mode & S_IXUSR) ? 'x' : '-';
access[4] = (mode & S_IRGRP) ? 'r' : '-';
access[5] = (mode & S_IWGRP) ? 'w' : '-';
access[6] = (mode & S_ISGID) ? ((mode & S_IXGRP) ? 's' : 'S') : (mode & S_IXGRP) ? 'x' : '-';
access[7] = (mode & S_IROTH) ? 'r' : '-';
access[8] = (mode & S_IWOTH) ? 'w' : '-';
access[9] = (mode & S_ISVTX) ? ((mode & S_IXOTH) ? 't' : 'T') : (mode & S_IXOTH) ? 'x' : '-';
return access;
}
BAN::String build_hard_links_string(nlink_t links)
{
return BAN::String::formatted("{}", links);
}
BAN::String build_owner_name_string(uid_t uid)
{
struct passwd* passwd = getpwuid(uid);
if (passwd == nullptr)
return BAN::String::formatted("{}", uid);
return BAN::String(BAN::StringView(passwd->pw_name));
}
BAN::String build_owner_group_string(gid_t gid)
{
return BAN::String::formatted("{}", gid);
}
BAN::String build_size_string(off_t size)
{
return BAN::String::formatted("{}", size);
}
BAN::String build_month_string(BAN::Time time)
{
static const char* months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
return BAN::String(BAN::StringView(months[(time.month - 1) % 12]));
}
BAN::String build_day_string(BAN::Time time)
{
return BAN::String::formatted("{}", time.day);
}
BAN::String build_time_string(BAN::Time time)
{
static uint32_t current_year = ({ timespec real_time; clock_gettime(CLOCK_REALTIME, &real_time); BAN::from_unix_time(real_time.tv_sec).year; });
if (time.year != current_year)
return BAN::String::formatted("{}", time.year);
return BAN::String::formatted("{2}:{2}", time.hour, time.minute);
}
int list_directory(const BAN::String& path, config_t config)
{
BAN::Vector<simple_entry_t> entries;
struct stat st;
auto stat_func = config.directory ? lstat : stat;
if (stat_func(path.data(), &st) == -1)
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{
perror("stat");
return 2;
}
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int ret = 0;
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if (!S_ISDIR(st.st_mode))
MUST(entries.emplace_back(path, st));
else
{
DIR* dirp = opendir(path.data());
if (dirp == NULL)
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{
perror("opendir");
return 2;
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}
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struct dirent* dirent;
while ((dirent = readdir(dirp)))
{
if (!config.all && dirent->d_name[0] == '.')
continue;
if (fstatat(dirfd(dirp), dirent->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1)
{
perror("fstatat");
ret = 1;
continue;
}
MUST(entries.emplace_back(BAN::StringView(dirent->d_name), st));
}
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closedir(dirp);
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}
BAN::sort::sort(entries.begin(), entries.end(),
[](const simple_entry_t& lhs, const simple_entry_t& rhs)
{
// sort directories first
bool lhs_isdir = S_ISDIR(lhs.st.st_mode);
bool rhs_isdir = S_ISDIR(rhs.st.st_mode);
if (lhs_isdir != rhs_isdir)
return lhs_isdir;
// sort by name
for (size_t i = 0; i < BAN::Math::min(lhs.name.size(), rhs.name.size()); i++)
if (lhs.name[i] != rhs.name[i])
return lhs.name[i] < rhs.name[i];
return lhs.name.size() < rhs.name.size();
}
);
if (!config.list)
{
for (size_t i = 0; i < entries.size(); i++)
{
if (i > 0)
printf(" ");
printf("%s%s\e[m", entry_color(entries[i].st.st_mode), entries[i].name.data());
}
printf("\n");
return ret;
}
BAN::Vector<full_entry_t> full_entries;
MUST(full_entries.reserve(entries.size()));
full_entry_t max_entry;
for (const simple_entry_t& entry : entries)
{
full_entry_t full_entry;
#define GET_ENTRY_STRING(property, input) \
full_entry.property = build_ ## property ## _string(input); \
if (full_entry.property.size() > max_entry.property.size()) \
max_entry.property = full_entry.property;
GET_ENTRY_STRING(access, entry.st.st_mode);
GET_ENTRY_STRING(hard_links, entry.st.st_nlink);
GET_ENTRY_STRING(owner_name, entry.st.st_uid);
GET_ENTRY_STRING(owner_group, entry.st.st_gid);
GET_ENTRY_STRING(size, entry.st.st_size);
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BAN::Time time = BAN::from_unix_time(entry.st.st_mtim.tv_sec);
GET_ENTRY_STRING(month, time);
GET_ENTRY_STRING(day, time);
GET_ENTRY_STRING(time, time);
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full_entry.full_name = BAN::String::formatted("{}{}\e[m", entry_color(entry.st.st_mode), entry.name);
MUST(full_entries.push_back(BAN::move(full_entry)));
}
for (const auto& full_entry : full_entries)
printf("%*s %*s %*s %*s %*s %*s %*s %*s %s\n",
(int)max_entry.access.size(), full_entry.access.data(),
(int)max_entry.hard_links.size(), full_entry.hard_links.data(),
(int)max_entry.owner_name.size(), full_entry.owner_name.data(),
(int)max_entry.owner_group.size(), full_entry.owner_group.data(),
(int)max_entry.size.size(), full_entry.size.data(),
(int)max_entry.month.size(), full_entry.month.data(),
(int)max_entry.day.size(), full_entry.day.data(),
(int)max_entry.time.size(), full_entry.time.data(),
full_entry.full_name.data()
);
return ret;
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}
int usage(const char* argv0, int ret)
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{
FILE* fout = ret ? stderr : stdout;
fprintf(fout, "usage: %s [OPTION]... [FILE]...\n", argv0);
fprintf(fout, " -a, --all show hidden files\n");
fprintf(fout, " -l, --list use list format\n");
fprintf(fout, " -d, --directory show directories as directories, don't list their contents\n");
fprintf(fout, " -h, --help show this message and exit\n");
return ret;
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}
int main(int argc, const char* argv[])
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{
config_t config;
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int i = 1;
for (; i < argc; i++)
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{
if (argv[i][0] != '-')
break;
if (argv[i][1] == '\0')
break;
if (argv[i][1] == '-')
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{
if (strcmp(argv[i], "--help") == 0)
return usage(argv[0], 0);
else if (strcmp(argv[i], "--all") == 0)
config.all = true;
else if (strcmp(argv[i], "--list") == 0)
config.list = true;
else if (strcmp(argv[i], "--directory") == 0)
config.directory = true;
else
{
fprintf(stderr, "unrecognized option '%s'\n", argv[i]);
return usage(argv[0], 2);
}
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}
else
{
for (size_t j = 1; argv[i][j]; j++)
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{
if (argv[i][j] == 'h')
return usage(argv[0], 0);
else if (argv[i][j] == 'a')
config.all = true;
else if (argv[i][j] == 'l')
config.list = true;
else if (argv[i][j] == 'd')
config.directory = true;
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else
{
fprintf(stderr, "unrecognized option '%c'\n", argv[i][j]);
return usage(argv[0], 2);
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}
}
}
}
BAN::Vector<BAN::String> files;
if (i == argc)
MUST(files.emplace_back("."sv));
else for (; i < argc; i++)
MUST(files.emplace_back(BAN::StringView(argv[i])));
int ret = 0;
for (size_t i = 0; i < files.size(); i++)
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{
if (i > 0)
printf("\n");
if (files.size() > 1)
printf("%s:\n", files[i].data());
ret = BAN::Math::max(ret, list_directory(files[i], config));
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}
return ret;
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}