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/* Copyright © 2003,2006 Roger Leigh <rleigh@debian.org>
*
* schroot 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 2 of the License, or
* (at your option) any later version.
*
* schroot 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*********************************************************************/
#include <config.h>
#include "sbuild-dirstream.h"
#include <cerrno>
#include <cstring>
using namespace sbuild;
namespace
{
typedef std::pair<dirstream::error_code,const char *> emap;
/**
* This is a list of the supported error codes. It's used to
* construct the real error codes map.
*/
emap init_errors[] =
{
emap(dirstream::DIR_OPEN, N_("Failed to open directory")),
emap(dirstream::DIR_READ, N_("Failed to read directory"))
};
}
template<>
error<dirstream::error_code>::map_type
error<dirstream::error_code>::error_strings
(init_errors,
init_errors + (sizeof(init_errors) / sizeof(init_errors[0])));
dirstream::dirstream(std::string const& dirname):
dirname(),
dir(0),
data(),
error_status(true),
eof_status(true)
{
open(dirname);
}
dirstream::~dirstream()
{
close();
}
void
dirstream::open(std::string const& dirname)
{
this->dir = opendir(dirname.c_str());
if (this->dir == 0)
{
this->dirname.clear();
this->error_status = true;
this->eof_status = true;
throw error(dirname, DIR_OPEN, strerror(errno));
}
this->dirname = dirname;
this->error_status = false;
this->eof_status = false;
read();
}
void
dirstream::read(int quantity)
{
int i;
if (this->dir == 0)
return;
for (i = 0; i < quantity; ++i)
{
struct dirent* entry;
errno = 0;
entry = readdir(dir);
if (entry == 0) // EOF or error
{
//std::cerr << "Directory read error: ";
if (errno) // error
{
this->error_status = true;
throw error(this->dirname, DIR_READ, strerror(errno));
}
return;
}
direntry newentry(entry); // make a direntry
this->data.push_back(newentry); // push onto the end of the list
}
}
// close the directory
// this also clears all the direntry data
void
dirstream::close()
{
if (this->dir)
closedir(this->dir); // don't throw an exception on failure -- it could
// be called in the destructor
this->dir = 0;
this->data.clear(); // clear all data
this->dirname.clear();
this->error_status = true;
this->eof_status = true;
}
bool
dirstream::eof() const
{
return this->eof_status;
}
bool
dirstream::bad() const
{
return this->error_status;
}
sbuild::dirstream::operator bool ()
{
return !(bad() || eof());
}
bool
sbuild::dirstream::operator ! ()
{
return bad() || eof();
}
dirstream&
sbuild::operator >> (dirstream& stream,
direntry& entry)
{
stream.read(); // read a new entry
if (stream && !stream.data.empty()) // not at end of file or bad.
{
entry = stream.data.front(); // assign next direntry to entry
stream.data.pop_front(); // remove the entry
}
else // blank the direntry and set EOF status
{
std::memset(&entry, 0, sizeof(direntry));
stream.eof_status = true;
}
return stream;
}
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