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/*
IMMS: Intelligent Multimedia Management System
Copyright (C) 2001-2009 Michael Grigoriev
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h> // for (s)random
#include <signal.h>
#include <time.h>
#include <math.h>
#include <unistd.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <iostream>
#include <fstream>
#include "immsconf.h"
#include "immsutil.h"
using std::ifstream;
using std::ofstream;
using std::endl;
using std::ios_base;
// Random
int imms_random(int max)
{
int rand_num;
static bool initialized = false;
#ifdef INITSTATE_USABLE
static struct random_data rand_data;
static char rand_state[256];
if (!initialized)
{
rand_data.state = (int32_t*)rand_state;
initstate_r(time(0), rand_state, sizeof(rand_state), &rand_data);
initialized = true;
}
random_r(&rand_data, &rand_num);
#else
if (!initialized)
{
srandom(time(0));
initialized = true;
}
rand_num = random();
#endif
double cof = rand_num / (RAND_MAX + 1.0);
return (int)(max * cof);
}
uint64_t usec_diff(struct timeval &tv1, struct timeval &tv2)
{
return (tv2.tv_sec - tv1.tv_sec) * 1000000
+ tv2.tv_usec - tv1.tv_usec;
}
StackTimer::StackTimer()
{
#ifdef DEBUG
gettimeofday(&start, 0);
#endif
}
StackTimer::~StackTimer()
{
#ifdef DEBUG
struct timeval end;
gettimeofday(&end, 0);
std::cout << usec_diff(start, end) / 1000 << " msecs elapsed" << std::endl;
#endif
}
string get_imms_root(const string &file)
{
static string dotimms;
if (dotimms == "")
{
char *immsroot = getenv("IMMSROOT");
if (immsroot)
{
dotimms = immsroot;
dotimms.append("/");
}
else
{
dotimms = getenv("HOME");
dotimms.append("/.imms/");
}
}
return dotimms + file;
}
StackLockFile::StackLockFile(const string &_name) : name(_name)
{
while (1)
{
ifstream lockfile(name.c_str());
int pid = 0;
lockfile >> pid;
if (!pid)
break;
if (kill(pid, 0))
break;
name = "";
return;
}
ofstream lockfile(name.c_str(), ios_base::trunc | ios_base::out);
lockfile << getpid() << std::endl;
lockfile.close();
}
StackLockFile::~StackLockFile()
{
if (name != "")
unlink(name.c_str());
}
float rms_string_distance(const string &s1, const string &s2, int max)
{
if (s1 == "" || s2 == "")
return 0;
int len = s1.length();
if (len != (int)s2.length())
return 0;
len = std::min(len, max);
float distance = 0;
for (int i = 0; i < len; ++i)
distance += pow(s1[i] - s2[i], 2);
return sqrt(distance / len);
}
string path_normalize(const string &path)
{
const char *start = path.c_str();
while (isspace(*start))
start++;
if (access(start, R_OK))
return start;
char resolved[4096];
realpath(start, resolved);
return resolved;
}
int listdir(const string &dirname, vector<string> &files)
{
files.clear();
DIR *dir = opendir(dirname.c_str());
if (!dir)
return errno;
struct dirent *de;
while ((de = readdir(dir)))
files.push_back(de->d_name);
closedir(dir);
return 0;
}
int socket_connect(const string &sockname)
{
int fd = socket(PF_UNIX, SOCK_STREAM, 0);
struct sockaddr_un sun;
sun.sun_family = AF_UNIX;
strncpy(sun.sun_path, sockname.c_str(), sizeof(sun.sun_path));
if (connect(fd, (sockaddr*)&sun, sizeof(sun)))
{
close(fd);
return -1;
}
return fd;
}
bool file_exists(const string &filename) {
struct stat buf;
return !stat(filename.c_str(), &buf);
}
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