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/*
copyright 20016-2017 Paul Dreik (earlier Paul Sundvall)
Distributed under GPL v 2.0 or later, at your option.
See LICENSE for further details.
*/
#include "config.h"
// std
#include <cerrno>
#include <cstring>
#include <iostream>
#include <string>
// os
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
// project
#include "Dirlist.hh"
#include "RdfindDebug.hh" //debug macros
static const int maxdepth = 50;
int
Dirlist::walk(const std::string& dir, const int recursionlevel)
{
RDDEBUG("Now in walk with dir=" << dir.c_str() << " and recursionlevel="
<< recursionlevel << std::endl);
if (recursionlevel >= maxdepth) {
std::cerr << "recursion limit exceeded\n";
return -1;
}
// open the directory
DIR* dirp = opendir(dir.c_str());
if (dirp == NULL) {
// failed to open directory
RDDEBUG("failed to open directory" << std::endl);
// this can be due to rights, or some other error.
handlepossiblefile(dir, recursionlevel);
return 1; // its a file (or something else)
}
// we opened the directory. let us read the content.
RDDEBUG("opened directory" << std::endl);
struct dirent* dp = NULL;
while (NULL != (dp = readdir(dirp))) {
// is the directory . or ..?
if (0 == strcmp(".", dp->d_name) || 0 == strcmp("..", dp->d_name)) {
continue;
}
// investigate what kind of file it is, dont follow any
// symlinks when doing this (lstat instead of stat).
struct stat info;
const int statval =
lstat((dir + "/" + std::string(dp->d_name)).c_str(), &info);
if (statval != 0) {
// failed to do stat
continue;
}
// investigate what kind of item it was.
bool dowalk = false;
if (S_ISLNK(info.st_mode)) {
// symlink
if (m_followsymlinks) {
(*m_callback)(dir, std::string(dp->d_name), recursionlevel);
}
if (m_followsymlinks) {
dowalk = true;
}
} else if (S_ISDIR(info.st_mode)) {
// directory
dowalk = true;
} else if (S_ISREG(info.st_mode)) {
// regular file
(*m_callback)(dir, std::string(dp->d_name), recursionlevel);
}
// try to open directory
if (dowalk) {
walk(dir + "/" + dp->d_name, recursionlevel + 1);
}
} // while
// close the directory
(void)closedir(dirp);
return 2; // its a directory
}
// splits inputstring into path and filename. if no / character is found,
// empty string is returned as path and filename is set to inputstring.
int
splitfilename(std::string& path,
std::string& filename,
const std::string& inputstring)
{
const auto pos = inputstring.rfind('/');
if (pos == std::string::npos) {
path = "";
filename = inputstring;
return -1;
}
path = inputstring.substr(0, pos + 1);
filename = inputstring.substr(pos + 1, std::string::npos);
return 0;
}
// this function is called for files that were believed to be directories,
// or failed re
int
Dirlist::handlepossiblefile(const std::string& possiblefile, int recursionlevel)
{
struct stat info;
RDDEBUG("Now in handlepossiblefile with name "
<< possiblefile.c_str() << " and recursionlevel " << recursionlevel
<< std::endl);
// split filename into path and filename
std::string path, filename;
splitfilename(path, filename, possiblefile);
RDDEBUG("split filename is path=" << path.c_str() << " filename="
<< filename.c_str() << std::endl);
// investigate what kind of file it is, dont follow symlink
int statval = 0;
do {
statval = lstat(possiblefile.c_str(), &info);
} while (statval < 0 && errno == EINTR);
if (statval < 0) {
// probably file does not exist, or trouble with rights.
RDDEBUG("got negative statval " << statval << std::endl);
//(*m_report_failed_on_stat)(path, filename, recursionlevel);
return -1;
} else {
RDDEBUG("got positive statval " << statval << std::endl);
}
if (S_ISLNK(info.st_mode)) {
RDDEBUG("found symlink" << std::endl);
if (m_followsymlinks) {
(*m_callback)(path, filename, recursionlevel);
}
return 0;
} else {
RDDEBUG("not a symlink" << std::endl);
}
if (S_ISDIR(info.st_mode)) {
std::cerr << "Dirlist.cc::handlepossiblefile: This should never happen. "
"FIXME! details on the next row:\n";
std::cerr << "possiblefile=\"" << possiblefile << "\"\n";
// this should never happen, because this function is only to be called
// for items that can not be opened with opendir.
// maybe it happens if someone else is changing the file while we
// are reading it?
return -2;
} else {
RDDEBUG("not a dir\n");
}
if (S_ISREG(info.st_mode)) {
RDDEBUG("it is a regular file" << std::endl);
(*m_callback)(path, filename, recursionlevel);
return 0;
} else {
RDDEBUG("not a regular file" << std::endl);
}
std::cout
<< "Dirlist.cc::handlepossiblefile(): found something else than a dir or "
"a regular file."
<< std::endl;
return -1;
}
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