]> git.lizzy.rs Git - dragonfireclient.git/blobdiff - src/porting.cpp
Patch built-in Lua to fix miscompile on Android (#12347)
[dragonfireclient.git] / src / porting.cpp
index 84df15b3093d166670a3b268e6c2354ad899989f..09627431c7e8bd501498d9ef147b92c93da787a4 100644 (file)
@@ -23,27 +23,60 @@ with this program; if not, write to the Free Software Foundation, Inc.,
        See comments in porting.h
 */
 
-#if defined(linux)
-       #include <unistd.h>
-#elif defined(__APPLE__)
-       #include <unistd.h>
-       #include <mach-o/dyld.h>
-#elif defined(__FreeBSD__)
-       #include <unistd.h>
+#include "porting.h"
+
+#if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__DragonFly__) || defined(__OpenBSD__)
        #include <sys/types.h>
        #include <sys/sysctl.h>
+       extern char **environ;
+#elif defined(_WIN32)
+       #include <windows.h>
+       #include <wincrypt.h>
+       #include <algorithm>
+       #include <shlwapi.h>
+       #include <shellapi.h>
+       #include <mmsystem.h>
+#endif
+#if !defined(_WIN32)
+       #include <unistd.h>
+       #include <sys/utsname.h>
+       #if !defined(__ANDROID__)
+               #include <spawn.h>
+       #endif
+#endif
+#if defined(__hpux)
+       #define _PSTAT64
+       #include <sys/pstat.h>
+#endif
+#if defined(__ANDROID__)
+       #include "porting_android.h"
+#endif
+#if defined(__APPLE__)
+       // For _NSGetEnviron()
+       // Related: https://gitlab.haskell.org/ghc/ghc/issues/2458
+       #include <crt_externs.h>
+#endif
+
+#if defined(__HAIKU__)
+        #include <FindDirectory.h>
 #endif
 
-#include "porting.h"
 #include "config.h"
 #include "debug.h"
 #include "filesys.h"
 #include "log.h"
 #include "util/string.h"
 #include <list>
-
-#ifdef __APPLE__
-       #include "CoreFoundation/CoreFoundation.h"
+#include <cstdarg>
+#include <cstdio>
+
+#if !defined(SERVER) && defined(_WIN32)
+// On Windows export some driver-specific variables to encourage Minetest to be
+// executed on the discrete GPU in case of systems with two. Portability is fun.
+extern "C" {
+       __declspec(dllexport) DWORD NvOptimusEnablement = 1;
+       __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 1;
+}
 #endif
 
 namespace porting
@@ -55,7 +88,7 @@ namespace porting
 
 bool g_killed = false;
 
-bool * signal_handler_killstatus(void)
+bool *signal_handler_killstatus()
 {
        return &g_killed;
 }
@@ -63,429 +96,696 @@ bool * signal_handler_killstatus(void)
 #if !defined(_WIN32) // POSIX
        #include <signal.h>
 
-void sigint_handler(int sig)
+void signal_handler(int sig)
 {
-       if(g_killed == false)
-       {
-               dstream<<DTIME<<"INFO: sigint_handler(): "
-                               <<"Ctrl-C pressed, shutting down."<<std::endl;
+       if (!g_killed) {
+               if (sig == SIGINT) {
+                       dstream << "INFO: signal_handler(): "
+                               << "Ctrl-C pressed, shutting down." << std::endl;
+               } else if (sig == SIGTERM) {
+                       dstream << "INFO: signal_handler(): "
+                               << "got SIGTERM, shutting down." << std::endl;
+               }
 
                // Comment out for less clutter when testing scripts
-               /*dstream<<DTIME<<"INFO: sigint_handler(): "
-                               <<"Printing debug stacks"<<std::endl;
+               /*dstream << "INFO: sigint_handler(): "
+                               << "Printing debug stacks" << std::endl;
                debug_stacks_print();*/
 
                g_killed = true;
-       }
-       else
-       {
-               (void)signal(SIGINT, SIG_DFL);
+       } else {
+               (void)signal(sig, SIG_DFL);
        }
 }
 
 void signal_handler_init(void)
 {
-       (void)signal(SIGINT, sigint_handler);
+       (void)signal(SIGINT, signal_handler);
+       (void)signal(SIGTERM, signal_handler);
 }
 
 #else // _WIN32
        #include <signal.h>
 
-       BOOL WINAPI event_handler(DWORD sig)
-       {
-               switch(sig)
-               {
-               case CTRL_C_EVENT:
-               case CTRL_CLOSE_EVENT:
-               case CTRL_LOGOFF_EVENT:
-               case CTRL_SHUTDOWN_EVENT:
-
-                       if(g_killed == false)
-                       {
-                               dstream<<DTIME<<"INFO: event_handler(): "
-                                               <<"Ctrl+C, Close Event, Logoff Event or Shutdown Event, shutting down."<<std::endl;
-                               // Comment out for less clutter when testing scripts
-                               /*dstream<<DTIME<<"INFO: event_handler(): "
-                                               <<"Printing debug stacks"<<std::endl;
-                               debug_stacks_print();*/
-
-                               g_killed = true;
-                       }
-                       else
-                       {
-                               (void)signal(SIGINT, SIG_DFL);
-                       }
-
-                       break;
-               case CTRL_BREAK_EVENT:
-                       break;
+BOOL WINAPI event_handler(DWORD sig)
+{
+       switch (sig) {
+       case CTRL_C_EVENT:
+       case CTRL_CLOSE_EVENT:
+       case CTRL_LOGOFF_EVENT:
+       case CTRL_SHUTDOWN_EVENT:
+               if (!g_killed) {
+                       dstream << "INFO: event_handler(): "
+                               << "Ctrl+C, Close Event, Logoff Event or Shutdown Event,"
+                               " shutting down." << std::endl;
+                       g_killed = true;
+               } else {
+                       (void)signal(SIGINT, SIG_DFL);
                }
-
-               return TRUE;
+               break;
+       case CTRL_BREAK_EVENT:
+               break;
        }
 
+       return TRUE;
+}
+
 void signal_handler_init(void)
 {
-       SetConsoleCtrlHandler( (PHANDLER_ROUTINE)event_handler,TRUE);
+       SetConsoleCtrlHandler((PHANDLER_ROUTINE)event_handler, TRUE);
 }
 
 #endif
 
 
 /*
-       Multithreading support
+       Path mangler
 */
-int getNumberOfProcessors() {
-#if defined(_SC_NPROCESSORS_ONLN)
 
-       return sysconf(_SC_NPROCESSORS_ONLN);
+// Default to RUN_IN_PLACE style relative paths
+std::string path_share = "..";
+std::string path_user = "..";
+std::string path_locale = path_share + DIR_DELIM + "locale";
+std::string path_cache = path_user + DIR_DELIM + "cache";
+
+
+std::string getDataPath(const char *subpath)
+{
+       return path_share + DIR_DELIM + subpath;
+}
+
+void pathRemoveFile(char *path, char delim)
+{
+       // Remove filename and path delimiter
+       int i;
+       for(i = strlen(path)-1; i>=0; i--)
+       {
+               if(path[i] == delim)
+                       break;
+       }
+       path[i] = 0;
+}
+
+bool detectMSVCBuildDir(const std::string &path)
+{
+       const char *ends[] = {
+               "bin\\Release",
+               "bin\\MinSizeRel",
+               "bin\\RelWithDebInfo",
+               "bin\\Debug",
+               "bin\\Build",
+               NULL
+       };
+       return (!removeStringEnd(path, ends).empty());
+}
 
-#elif defined(__FreeBSD__) || defined(__APPLE__)
+std::string get_sysinfo()
+{
+#ifdef _WIN32
 
-       unsigned int len, count;
-       len = sizeof(count);
-       return sysctlbyname("hw.ncpu", &count, &len, NULL, 0);
+       std::ostringstream oss;
+       LPSTR filePath = new char[MAX_PATH];
+       UINT blockSize;
+       VS_FIXEDFILEINFO *fixedFileInfo;
 
-#elif defined(_GNU_SOURCE)
+       GetSystemDirectoryA(filePath, MAX_PATH);
+       PathAppendA(filePath, "kernel32.dll");
 
-       return get_nprocs();
+       DWORD dwVersionSize = GetFileVersionInfoSizeA(filePath, NULL);
+       LPBYTE lpVersionInfo = new BYTE[dwVersionSize];
 
-#elif defined(_WIN32)
+       GetFileVersionInfoA(filePath, 0, dwVersionSize, lpVersionInfo);
+       VerQueryValueA(lpVersionInfo, "\\", (LPVOID *)&fixedFileInfo, &blockSize);
 
-       SYSTEM_INFO sysinfo;
-       GetSystemInfo(&sysinfo);
-       return sysinfo.dwNumberOfProcessors;
+       oss << "Windows/"
+               << HIWORD(fixedFileInfo->dwProductVersionMS) << '.' // Major
+               << LOWORD(fixedFileInfo->dwProductVersionMS) << '.' // Minor
+               << HIWORD(fixedFileInfo->dwProductVersionLS) << ' '; // Build
 
-#elif defined(PTW32_VERSION) || defined(__hpux)
+       #ifdef _WIN64
+       oss << "x86_64";
+       #else
+       BOOL is64 = FALSE;
+       if (IsWow64Process(GetCurrentProcess(), &is64) && is64)
+               oss << "x86_64"; // 32-bit app on 64-bit OS
+       else
+               oss << "x86";
+       #endif
 
-       return pthread_num_processors_np();
+       delete[] lpVersionInfo;
+       delete[] filePath;
 
+       return oss.str();
 #else
+       struct utsname osinfo;
+       uname(&osinfo);
+       return std::string(osinfo.sysname) + "/"
+               + osinfo.release + " " + osinfo.machine;
+#endif
+}
 
-       return 1;
 
+bool getCurrentWorkingDir(char *buf, size_t len)
+{
+#ifdef _WIN32
+       DWORD ret = GetCurrentDirectory(len, buf);
+       return (ret != 0) && (ret <= len);
+#else
+       return getcwd(buf, len);
 #endif
 }
 
 
-bool threadBindToProcessor(threadid_t tid, int pnumber) {
-#if defined(_WIN32)
+bool getExecPathFromProcfs(char *buf, size_t buflen)
+{
+#ifndef _WIN32
+       buflen--;
 
-       HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, 0, tid);
-       if (!hThread)
+       ssize_t len;
+       if ((len = readlink("/proc/self/exe",     buf, buflen)) == -1 &&
+               (len = readlink("/proc/curproc/file", buf, buflen)) == -1 &&
+               (len = readlink("/proc/curproc/exe",  buf, buflen)) == -1)
                return false;
 
-       bool success = SetThreadAffinityMask(hThread, 1 << pnumber) != 0;
-
-       CloseHandle(hThread);
-       return success;
+       buf[len] = '\0';
+       return true;
+#else
+       return false;
+#endif
+}
 
-#elif (defined(__FreeBSD__) && (__FreeBSD_version >= 702106)) \
-       || defined(__linux) || defined(linux)
+//// Windows
+#if defined(_WIN32)
 
-       cpu_set_t cpuset;
+bool getCurrentExecPath(char *buf, size_t len)
+{
+       DWORD written = GetModuleFileNameA(NULL, buf, len);
+       if (written == 0 || written == len)
+               return false;
 
-       CPU_ZERO(&cpuset);
-       CPU_SET(pnumber, &cpuset);
-       return pthread_setaffinity_np(tid, sizeof(cpuset), &cpuset) == 0;
+       return true;
+}
 
-#elif defined(__sun) || defined(sun)
 
-       return processor_bind(P_LWPID, MAKE_LWPID_PTHREAD(tid), 
-                                               pnumber, NULL) == 0;
+//// Linux
+#elif defined(__linux__)
 
-#elif defined(_AIX)
-       
-       return bindprocessor(BINDTHREAD, (tid_t)tid, pnumber) == 0;
+bool getCurrentExecPath(char *buf, size_t len)
+{
+       if (!getExecPathFromProcfs(buf, len))
+               return false;
 
-#elif defined(__hpux) || defined(hpux)
+       return true;
+}
 
-       pthread_spu_t answer;
 
-       return pthread_processor_bind_np(PTHREAD_BIND_ADVISORY_NP,
-                                                                       &answer, pnumber, tid) == 0;
-       
+//// Mac OS X, Darwin
 #elif defined(__APPLE__)
 
-       struct thread_affinity_policy tapol;
-       
-       thread_port_t threadport = pthread_mach_thread_np(tid);
-       tapol.affinity_tag = pnumber + 1;
-       return thread_policy_set(threadport, THREAD_AFFINITY_POLICY,
-                       (thread_policy_t)&tapol, THREAD_AFFINITY_POLICY_COUNT) == KERN_SUCCESS;
-
-#else
-
-       return false;
+bool getCurrentExecPath(char *buf, size_t len)
+{
+       uint32_t lenb = (uint32_t)len;
+       if (_NSGetExecutablePath(buf, &lenb) == -1)
+               return false;
 
-#endif
+       return true;
 }
 
 
-bool threadSetPriority(threadid_t tid, int prio) {
-#if defined(_WIN32)
+//// FreeBSD, NetBSD, DragonFlyBSD
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 
-       HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, 0, tid);
-       if (!hThread)
-               return false;
+bool getCurrentExecPath(char *buf, size_t len)
+{
+       // Try getting path from procfs first, since valgrind
+       // doesn't work with the latter
+       if (getExecPathFromProcfs(buf, len))
+               return true;
 
-       bool success = SetThreadPriority(hThread, prio) != 0;
+       int mib[4];
 
-       CloseHandle(hThread);
-       return success;
-       
-#else
+       mib[0] = CTL_KERN;
+       mib[1] = KERN_PROC;
+       mib[2] = KERN_PROC_PATHNAME;
+       mib[3] = -1;
 
-       struct sched_param sparam;
-       int policy;
-       
-       if (pthread_getschedparam(tid, &policy, &sparam) != 0)
+       if (sysctl(mib, 4, buf, &len, NULL, 0) == -1)
                return false;
-               
-       int min = sched_get_priority_min(policy);
-       int max = sched_get_priority_max(policy);
 
-       sparam.sched_priority = min + prio * (max - min) / THREAD_PRIORITY_HIGHEST;
-       return pthread_setschedparam(tid, policy, &sparam) == 0;
-       
-#endif
+       return true;
 }
 
+#elif defined(__HAIKU__)
 
-/*
-       Path mangler
-*/
+bool getCurrentExecPath(char *buf, size_t len)
+{
+       return find_path(B_APP_IMAGE_SYMBOL, B_FIND_PATH_IMAGE_PATH, NULL, buf, len) == B_OK;
+}
 
-// Default to RUN_IN_PLACE style relative paths
-std::string path_share = "..";
-std::string path_user = "..";
+//// Solaris
+#elif defined(__sun) || defined(sun)
 
-std::string getDataPath(const char *subpath)
+bool getCurrentExecPath(char *buf, size_t len)
 {
-       return path_share + DIR_DELIM + subpath;
+       const char *exec = getexecname();
+       if (exec == NULL)
+               return false;
+
+       if (strlcpy(buf, exec, len) >= len)
+               return false;
+
+       return true;
 }
 
-void pathRemoveFile(char *path, char delim)
+
+// HP-UX
+#elif defined(__hpux)
+
+bool getCurrentExecPath(char *buf, size_t len)
 {
-       // Remove filename and path delimiter
-       int i;
-       for(i = strlen(path)-1; i>=0; i--)
-       {
-               if(path[i] == delim)
-                       break;
-       }
-       path[i] = 0;
+       struct pst_status psts;
+
+       if (pstat_getproc(&psts, sizeof(psts), 0, getpid()) == -1)
+               return false;
+
+       if (pstat_getpathname(buf, len, &psts.pst_fid_text) == -1)
+               return false;
+
+       return true;
 }
 
-bool detectMSVCBuildDir(char *c_path)
+
+#else
+
+bool getCurrentExecPath(char *buf, size_t len)
 {
-       std::string path(c_path);
-       const char *ends[] = {"bin\\Release", "bin\\Build", NULL};
-       return (removeStringEnd(path, ends) != "");
+       return false;
 }
 
-void initializePaths()
+#endif
+
+
+//// Non-Windows
+#if !defined(_WIN32)
+
+const char *getHomeOrFail()
 {
-#if RUN_IN_PLACE
-       /*
-               Use relative paths if RUN_IN_PLACE
-       */
+       const char *home = getenv("HOME");
+       // In rare cases the HOME environment variable may be unset
+       FATAL_ERROR_IF(!home,
+               "Required environment variable HOME is not set");
+       return home;
+}
+
+#endif
 
-       infostream<<"Using relative paths (RUN_IN_PLACE)"<<std::endl;
 
-       /*
-               Windows
-       */
-       #if defined(_WIN32)
+//// Windows
+#if defined(_WIN32)
 
-       const DWORD buflen = 1000;
-       char buf[buflen];
-       DWORD len;
+bool setSystemPaths()
+{
+       char buf[BUFSIZ];
 
        // Find path of executable and set path_share relative to it
-       len = GetModuleFileName(GetModuleHandle(NULL), buf, buflen);
-       assert(len < buflen);
+       FATAL_ERROR_IF(!getCurrentExecPath(buf, sizeof(buf)),
+               "Failed to get current executable path");
        pathRemoveFile(buf, '\\');
 
-       if(detectMSVCBuildDir(buf)){
-               infostream<<"MSVC build directory detected"<<std::endl;
-               path_share = std::string(buf) + "\\..\\..";
-               path_user = std::string(buf) + "\\..\\..";
-       }
-       else{
-               path_share = std::string(buf) + "\\..";
-               path_user = std::string(buf) + "\\..";
-       }
+       std::string exepath(buf);
 
-       /*
-               Linux
-       */
-       #elif defined(linux)
+       // Use ".\bin\.."
+       path_share = exepath + "\\..";
+       if (detectMSVCBuildDir(exepath)) {
+               // The msvc build dir schould normaly not be present if properly installed,
+               // but its usefull for debugging.
+               path_share += DIR_DELIM "..";
+       }
 
-       char buf[BUFSIZ];
-       memset(buf, 0, BUFSIZ);
-       // Get path to executable
-       assert(readlink("/proc/self/exe", buf, BUFSIZ-1) != -1);
+       // Use "C:\Users\<user>\AppData\Roaming\<PROJECT_NAME_C>"
+       DWORD len = GetEnvironmentVariable("APPDATA", buf, sizeof(buf));
+       FATAL_ERROR_IF(len == 0 || len > sizeof(buf), "Failed to get APPDATA");
 
-       pathRemoveFile(buf, '/');
+       path_user = std::string(buf) + DIR_DELIM + PROJECT_NAME_C;
+       return true;
+}
 
-       path_share = std::string(buf) + "/..";
-       path_user = std::string(buf) + "/..";
 
-       /*
-               OS X
-       */
-       #elif defined(__APPLE__)
+//// Linux
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 
-       //https://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/dyld.3.html
-       //TODO: Test this code
+bool setSystemPaths()
+{
        char buf[BUFSIZ];
-       uint32_t len = sizeof(buf);
-       assert(_NSGetExecutablePath(buf, &len) != -1);
+
+       if (!getCurrentExecPath(buf, sizeof(buf))) {
+#ifdef __ANDROID__
+               errorstream << "Unable to read bindir "<< std::endl;
+#else
+               FATAL_ERROR("Unable to read bindir");
+#endif
+               return false;
+       }
 
        pathRemoveFile(buf, '/');
+       std::string bindir(buf);
+
+       // Find share directory from these.
+       // It is identified by containing the subdirectory "builtin".
+       std::list<std::string> trylist;
+       std::string static_sharedir = STATIC_SHAREDIR;
+       if (!static_sharedir.empty() && static_sharedir != ".")
+               trylist.push_back(static_sharedir);
 
-       path_share = std::string(buf) + "/..";
-       path_user = std::string(buf) + "/..";
+       trylist.push_back(bindir + DIR_DELIM ".." DIR_DELIM "share"
+               DIR_DELIM + PROJECT_NAME);
+       trylist.push_back(bindir + DIR_DELIM "..");
 
-       /*
-               FreeBSD
-       */
-       #elif defined(__FreeBSD__)
+#ifdef __ANDROID__
+       trylist.push_back(path_user);
+#endif
 
-       int mib[4];
-       char buf[BUFSIZ];
-       size_t len = sizeof(buf);
+       for (std::list<std::string>::const_iterator
+                       i = trylist.begin(); i != trylist.end(); ++i) {
+               const std::string &trypath = *i;
+               if (!fs::PathExists(trypath) ||
+                       !fs::PathExists(trypath + DIR_DELIM + "builtin")) {
+                       warningstream << "system-wide share not found at \""
+                                       << trypath << "\""<< std::endl;
+                       continue;
+               }
 
-       mib[0] = CTL_KERN;
-       mib[1] = KERN_PROC;
-       mib[2] = KERN_PROC_PATHNAME;
-       mib[3] = -1;
-       assert(sysctl(mib, 4, buf, &len, NULL, 0) != -1);
+               // Warn if was not the first alternative
+               if (i != trylist.begin()) {
+                       warningstream << "system-wide share found at \""
+                                       << trypath << "\"" << std::endl;
+               }
 
-       pathRemoveFile(buf, '/');
+               path_share = trypath;
+               break;
+       }
 
-       path_share = std::string(buf) + "/..";
-       path_user = std::string(buf) + "/..";
+#ifndef __ANDROID__
+       path_user = std::string(getHomeOrFail()) + DIR_DELIM "."
+               + PROJECT_NAME;
+#endif
 
-       #else
+       return true;
+}
 
-       //TODO: Get path of executable. This assumes working directory is bin/
-       dstream<<"WARNING: Relative path not properly supported on this platform"
-                       <<std::endl;
-       path_share = std::string("..");
-       path_user = std::string("..");
 
-       #endif
+//// Mac OS X
+#elif defined(__APPLE__)
 
-#else // RUN_IN_PLACE
+bool setSystemPaths()
+{
+       CFBundleRef main_bundle = CFBundleGetMainBundle();
+       CFURLRef resources_url = CFBundleCopyResourcesDirectoryURL(main_bundle);
+       char path[PATH_MAX];
+       if (CFURLGetFileSystemRepresentation(resources_url,
+                       TRUE, (UInt8 *)path, PATH_MAX)) {
+               path_share = std::string(path);
+       } else {
+               warningstream << "Could not determine bundle resource path" << std::endl;
+       }
+       CFRelease(resources_url);
 
-       /*
-               Use platform-specific paths otherwise
-       */
+       path_user = std::string(getHomeOrFail())
+               + "/Library/Application Support/"
+               + PROJECT_NAME;
+       return true;
+}
 
-       infostream<<"Using system-wide paths (NOT RUN_IN_PLACE)"<<std::endl;
 
-       /*
-               Windows
-       */
-       #if defined(_WIN32)
+#else
 
-       const DWORD buflen = 1000;
-       char buf[buflen];
-       DWORD len;
+bool setSystemPaths()
+{
+       path_share = STATIC_SHAREDIR;
+       path_user  = std::string(getHomeOrFail()) + DIR_DELIM "."
+               + lowercase(PROJECT_NAME);
+       return true;
+}
 
-       // Find path of executable and set path_share relative to it
-       len = GetModuleFileName(GetModuleHandle(NULL), buf, buflen);
-       assert(len < buflen);
-       pathRemoveFile(buf, '\\');
 
-       // Use ".\bin\.."
-       path_share = std::string(buf) + "\\..";
+#endif
 
-       // Use "C:\Documents and Settings\user\Application Data\<PROJECT_NAME>"
-       len = GetEnvironmentVariable("APPDATA", buf, buflen);
-       assert(len < buflen);
-       path_user = std::string(buf) + DIR_DELIM + PROJECT_NAME;
+void migrateCachePath()
+{
+       const std::string local_cache_path = path_user + DIR_DELIM + "cache";
 
-       /*
-               Linux
-       */
-       #elif defined(linux)
+       // Delete tmp folder if it exists (it only ever contained
+       // a temporary ogg file, which is no longer used).
+       if (fs::PathExists(local_cache_path + DIR_DELIM + "tmp"))
+               fs::RecursiveDelete(local_cache_path + DIR_DELIM + "tmp");
 
-       // Get path to executable
-       std::string bindir = "";
-       {
-               char buf[BUFSIZ];
-               memset(buf, 0, BUFSIZ);
-               assert(readlink("/proc/self/exe", buf, BUFSIZ-1) != -1);
-               pathRemoveFile(buf, '/');
-               bindir = buf;
+       // Bail if migration impossible
+       if (path_cache == local_cache_path || !fs::PathExists(local_cache_path)
+                       || fs::PathExists(path_cache)) {
+               return;
        }
+       if (!fs::Rename(local_cache_path, path_cache)) {
+               errorstream << "Failed to migrate local cache path "
+                       "to system path!" << std::endl;
+       }
+}
 
-       // Find share directory from these.
-       // It is identified by containing the subdirectory "builtin".
-       std::list<std::string> trylist;
-       std::string static_sharedir = STATIC_SHAREDIR;
-       if(static_sharedir != "" && static_sharedir != ".")
-               trylist.push_back(static_sharedir);
-       trylist.push_back(bindir + "/../share/" + PROJECT_NAME);
-       trylist.push_back(bindir + "/..");
+void initializePaths()
+{
+#if RUN_IN_PLACE
+       char buf[BUFSIZ];
 
-       for(std::list<std::string>::const_iterator i = trylist.begin();
-                       i != trylist.end(); i++)
-       {
-               const std::string &trypath = *i;
-               if(!fs::PathExists(trypath) || !fs::PathExists(trypath + "/builtin")){
-                       dstream<<"WARNING: system-wide share not found at \""
-                                       <<trypath<<"\""<<std::endl;
-                       continue;
+       infostream << "Using relative paths (RUN_IN_PLACE)" << std::endl;
+
+       bool success =
+               getCurrentExecPath(buf, sizeof(buf)) ||
+               getExecPathFromProcfs(buf, sizeof(buf));
+
+       if (success) {
+               pathRemoveFile(buf, DIR_DELIM_CHAR);
+               std::string execpath(buf);
+
+               path_share = execpath + DIR_DELIM "..";
+               path_user  = execpath + DIR_DELIM "..";
+
+               if (detectMSVCBuildDir(execpath)) {
+                       path_share += DIR_DELIM "..";
+                       path_user  += DIR_DELIM "..";
                }
-               // Warn if was not the first alternative
-               if(i != trylist.begin()){
-                       dstream<<"WARNING: system-wide share found at \""
-                                       <<trypath<<"\""<<std::endl;
+       } else {
+               errorstream << "Failed to get paths by executable location, "
+                       "trying cwd" << std::endl;
+
+               if (!getCurrentWorkingDir(buf, sizeof(buf)))
+                       FATAL_ERROR("Ran out of methods to get paths");
+
+               size_t cwdlen = strlen(buf);
+               if (cwdlen >= 1 && buf[cwdlen - 1] == DIR_DELIM_CHAR) {
+                       cwdlen--;
+                       buf[cwdlen] = '\0';
                }
-               path_share = trypath;
-               break;
+
+               if (cwdlen >= 4 && !strcmp(buf + cwdlen - 4, DIR_DELIM "bin"))
+                       pathRemoveFile(buf, DIR_DELIM_CHAR);
+
+               std::string execpath(buf);
+
+               path_share = execpath;
+               path_user  = execpath;
+       }
+       path_cache = path_user + DIR_DELIM + "cache";
+#else
+       infostream << "Using system-wide paths (NOT RUN_IN_PLACE)" << std::endl;
+
+       if (!setSystemPaths())
+               errorstream << "Failed to get one or more system-wide path" << std::endl;
+
+
+#  ifdef _WIN32
+       path_cache = path_user + DIR_DELIM + "cache";
+#  else
+       // Initialize path_cache
+       // First try $XDG_CACHE_HOME/PROJECT_NAME
+       const char *cache_dir = getenv("XDG_CACHE_HOME");
+       const char *home_dir = getenv("HOME");
+       if (cache_dir && cache_dir[0] != '\0') {
+               path_cache = std::string(cache_dir) + DIR_DELIM + PROJECT_NAME;
+       } else if (home_dir) {
+               // Then try $HOME/.cache/PROJECT_NAME
+               path_cache = std::string(home_dir) + DIR_DELIM + ".cache"
+                       + DIR_DELIM + PROJECT_NAME;
+       } else {
+               // If neither works, use $PATH_USER/cache
+               path_cache = path_user + DIR_DELIM + "cache";
+       }
+       // Migrate cache folder to new location if possible
+       migrateCachePath();
+#  endif // _WIN32
+#endif // RUN_IN_PLACE
+
+       infostream << "Detected share path: " << path_share << std::endl;
+       infostream << "Detected user path: " << path_user << std::endl;
+       infostream << "Detected cache path: " << path_cache << std::endl;
+
+#if USE_GETTEXT
+       bool found_localedir = false;
+#  ifdef STATIC_LOCALEDIR
+       /* STATIC_LOCALEDIR may be a generalized path such as /usr/share/locale that
+        * doesn't necessarily contain our locale files, so check data path first. */
+       path_locale = getDataPath("locale");
+       if (fs::PathExists(path_locale)) {
+               found_localedir = true;
+               infostream << "Using in-place locale directory " << path_locale
+                       << " even though a static one was provided." << std::endl;
+       } else if (STATIC_LOCALEDIR[0] && fs::PathExists(STATIC_LOCALEDIR)) {
+               found_localedir = true;
+               path_locale = STATIC_LOCALEDIR;
+               infostream << "Using static locale directory " << STATIC_LOCALEDIR
+                       << std::endl;
+       }
+#  else
+       path_locale = getDataPath("locale");
+       if (fs::PathExists(path_locale)) {
+               found_localedir = true;
+       }
+#  endif
+       if (!found_localedir) {
+               warningstream << "Couldn't find a locale directory!" << std::endl;
        }
+#endif  // USE_GETTEXT
+}
 
-       path_user = std::string(getenv("HOME")) + "/." + PROJECT_NAME;
+////
+//// OS-specific Secure Random
+////
 
-       /*
-               OS X
-       */
-       #elif defined(__APPLE__)
+#ifdef WIN32
 
-    // Code based on
-    // http://stackoverflow.com/questions/516200/relative-paths-not-working-in-xcode-c
-    CFBundleRef main_bundle = CFBundleGetMainBundle();
-    CFURLRef resources_url = CFBundleCopyResourcesDirectoryURL(main_bundle);
-    char path[PATH_MAX];
-    if(CFURLGetFileSystemRepresentation(resources_url, TRUE, (UInt8 *)path, PATH_MAX))
-       {
-               dstream<<"Bundle resource path: "<<path<<std::endl;
-               //chdir(path);
-               path_share = std::string(path) + "/share";
+bool secure_rand_fill_buf(void *buf, size_t len)
+{
+       HCRYPTPROV wctx;
+
+       if (!CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+               return false;
+
+       CryptGenRandom(wctx, len, (BYTE *)buf);
+       CryptReleaseContext(wctx, 0);
+       return true;
+}
+
+#else
+
+bool secure_rand_fill_buf(void *buf, size_t len)
+{
+       // N.B.  This function checks *only* for /dev/urandom, because on most
+       // common OSes it is non-blocking, whereas /dev/random is blocking, and it
+       // is exceptionally uncommon for there to be a situation where /dev/random
+       // exists but /dev/urandom does not.  This guesswork is necessary since
+       // random devices are not covered by any POSIX standard...
+       FILE *fp = fopen("/dev/urandom", "rb");
+       if (!fp)
+               return false;
+
+       bool success = fread(buf, len, 1, fp) == 1;
+
+       fclose(fp);
+       return success;
+}
+
+#endif
+
+void attachOrCreateConsole()
+{
+#ifdef _WIN32
+       static bool consoleAllocated = false;
+       const bool redirected = (_fileno(stdout) == -2 || _fileno(stdout) == -1); // If output is redirected to e.g a file
+       if (!consoleAllocated && redirected && (AttachConsole(ATTACH_PARENT_PROCESS) || AllocConsole())) {
+               freopen("CONOUT$", "w", stdout);
+               freopen("CONOUT$", "w", stderr);
+               consoleAllocated = true;
        }
-       else
-    {
-        // error!
-               dstream<<"WARNING: Could not determine bundle resource path"<<std::endl;
-    }
-    CFRelease(resources_url);
+#endif
+}
 
-       path_user = std::string(getenv("HOME")) + "/Library/Application Support/" + PROJECT_NAME;
+int mt_snprintf(char *buf, const size_t buf_size, const char *fmt, ...)
+{
+       // https://msdn.microsoft.com/en-us/library/bt7tawza.aspx
+       //  Many of the MSVC / Windows printf-style functions do not support positional
+       //  arguments (eg. "%1$s"). We just forward the call to vsnprintf for sane
+       //  platforms, but defer to _vsprintf_p on MSVC / Windows.
+       // https://github.com/FFmpeg/FFmpeg/blob/5ae9fa13f5ac640bec113120d540f70971aa635d/compat/msvcrt/snprintf.c#L46
+       //  _vsprintf_p has to be shimmed with _vscprintf_p on -1 (for an example see
+       //  above FFmpeg link).
+       va_list args;
+       va_start(args, fmt);
+#ifndef _MSC_VER
+       int c = vsnprintf(buf, buf_size, fmt, args);
+#else  // _MSC_VER
+       int c = _vsprintf_p(buf, buf_size, fmt, args);
+       if (c == -1)
+               c = _vscprintf_p(fmt, args);
+#endif // _MSC_VER
+       va_end(args);
+       return c;
+}
 
-       #elif defined(__FreeBSD__)
+static bool open_uri(const std::string &uri)
+{
+       if (uri.find_first_of("\r\n") != std::string::npos) {
+               errorstream << "Unable to open URI as it is invalid, contains new line: " << uri << std::endl;
+               return false;
+       }
 
-       path_share = STATIC_SHAREDIR;
-       path_user = std::string(getenv("HOME")) + "/." + PROJECT_NAME;
+#if defined(_WIN32)
+       return (intptr_t)ShellExecuteA(NULL, NULL, uri.c_str(), NULL, NULL, SW_SHOWNORMAL) > 32;
+#elif defined(__ANDROID__)
+       openURIAndroid(uri);
+       return true;
+#elif defined(__APPLE__)
+       const char *argv[] = {"open", uri.c_str(), NULL};
+       return posix_spawnp(NULL, "open", NULL, NULL, (char**)argv,
+               (*_NSGetEnviron())) == 0;
+#else
+       const char *argv[] = {"xdg-open", uri.c_str(), NULL};
+       return posix_spawnp(NULL, "xdg-open", NULL, NULL, (char**)argv, environ) == 0;
+#endif
+}
 
-       #endif
+bool open_url(const std::string &url)
+{
+       if (url.substr(0, 7) != "http://" && url.substr(0, 8) != "https://") {
+               errorstream << "Unable to open browser as URL is missing schema: " << url << std::endl;
+               return false;
+       }
 
-#endif // RUN_IN_PLACE
+       return open_uri(url);
 }
 
-} //namespace porting
+bool open_directory(const std::string &path)
+{
+       if (!fs::IsDir(path)) {
+               errorstream << "Unable to open directory as it does not exist: " << path << std::endl;
+               return false;
+       }
+
+       return open_uri(path);
+}
 
+// Load performance counter frequency only once at startup
+#ifdef _WIN32
+
+inline double get_perf_freq()
+{
+       // Also use this opportunity to enable high-res timers
+       timeBeginPeriod(1);
+
+       LARGE_INTEGER freq;
+       QueryPerformanceFrequency(&freq);
+       return freq.QuadPart;
+}
+
+double perf_freq = get_perf_freq();
+
+#endif
+
+} //namespace porting