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#include "read.hpp"
// io/read.cpp - Input from files
//
// Copyright © 2013-2014 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <fcntl.h>
#include "../strings/astring.hpp"
#include "../strings/mstring.hpp"
#include "../strings/zstring.hpp"
#include "../strings/literal.hpp"
#include "cxxstdio.hpp"
#include "../poison.hpp"
namespace tmwa
{
namespace io
{
ReadFile::ReadFile(FD f)
: fd(f), start(0), end(0)
// only for debug-sanity
, buf{}
{
}
ReadFile::ReadFile(ZString name)
: fd(FD::open(name, O_RDONLY | O_CLOEXEC)), start(0), end(0)
{
}
ReadFile::ReadFile(const DirFd& dir, ZString name)
: fd(dir.open_fd(name, O_RDONLY | O_CLOEXEC)), start(0), end(0)
{
}
ReadFile::ReadFile(read_file_from_string, XString content, FD f)
: fd(f), start(0), end(), extra()
{
if (content.size() <= 4096)
{
end = content.size();
auto z = std::copy(content.begin(), content.end(), buf);
// only for debug sanity
std::fill(z, std::end(buf), 0);
return;
}
auto base = content.base();
if (!base)
{
extra = content;
end = content.size();
return;
}
start = &*content.begin() - &*base->begin();
end = &*content.end() - &*base->begin();
extra = *base;
}
ReadFile::ReadFile(read_file_from_string, LString content, FD f)
: ReadFile(from_string, RString(content), f)
{
}
ReadFile::~ReadFile()
{
fd.close();
fd = FD();
}
bool ReadFile::get(char& c)
{
if (extra)
{
c = extra[start];
++start;
if (start == end)
extra = ""_s;
return true;
}
if (start == end)
{
if (fd == FD())
return false;
ssize_t rv = fd.read(&buf, sizeof(buf));
if (rv == 0 || rv == -1)
{
fd.close();
fd = FD();
return false;
}
start = 0;
end = rv;
}
c = buf[start++];
return true;
}
size_t ReadFile::get(char *out, size_t len)
{
for (size_t i = 0; i < len; ++i)
{
if (!get(out[i]))
return i;
}
return len;
}
bool ReadFile::getline(AString& line)
{
bool was_real_file = fd != FD();
MString tmp;
char c;
bool anything = false;
bool happy = false;
bool unhappy = false;
while (get(c))
{
anything = true;
if (c == '\r')
{
unhappy = true;
if (!get(c))
break;
if (c != '\n')
--start;
else
happy = true;
break;
}
if (c == '\n')
{
happy = true;
break;
}
tmp += c;
}
if (unhappy)
{
if (happy)
FPRINTF(stderr, "warning: file contains CR\n"_fmt);
else
FPRINTF(stderr, "warning: file contains bare CR\n"_fmt);
}
else if (!happy && anything && was_real_file)
{
FPRINTF(stderr, "warning: file does not contain a trailing newline\n"_fmt);
}
line = AString(tmp);
return anything;
}
bool ReadFile::is_open()
{
return fd != FD() || start != end;
}
} // namespace io
} // namespace tmwa
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