src/filesys.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "filesys.h"
  21 #include "util/string.h"
  22 #include <iostream>
  23 #include <cstdio>
  24 #include <cstdlib>
  25 #include <cstring>
  26 #include <cerrno>
  27 #include <fstream>
  28 #include "log.h"
  29 #include "config.h"
  30 #include "porting.h"
  31 #ifndef SERVER
  32 #include "irr_ptr.h"
  33 #endif
  34
  35 namespace fs
  36 {
  37
  38 #ifdef _WIN32
  39
  40 /***********
  41  * Windows *
  42  ***********/
  43
  44 #ifndef _WIN32_WINNT
  45 #define _WIN32_WINNT 0x0501
  46 #endif
  47 #include <windows.h>
  48 #include <shlwapi.h>
  49 #include <io.h>
  50 #include <direct.h>
  51
  52 std::vector<DirListNode> GetDirListing(const std::string &pathstring)
  53 {
  54         std::vector<DirListNode> listing;
  55
  56         WIN32_FIND_DATA FindFileData;
  57         HANDLE hFind = INVALID_HANDLE_VALUE;
  58         DWORD dwError;
  59
  60         std::string dirSpec = pathstring + "\\*";
  61
  62         // Find the first file in the directory.
  63         hFind = FindFirstFile(dirSpec.c_str(), &FindFileData);
  64
  65         if (hFind == INVALID_HANDLE_VALUE) {
  66                 dwError = GetLastError();
  67                 if (dwError != ERROR_FILE_NOT_FOUND && dwError != ERROR_PATH_NOT_FOUND) {
  68                         errorstream << "GetDirListing: FindFirstFile error."
  69                                         << " Error is " << dwError << std::endl;
  70                 }
  71         } else {
  72                 // NOTE:
  73                 // Be very sure to not include '..' in the results, it will
  74                 // result in an epic failure when deleting stuff.
  75
  76                 DirListNode node;
  77                 node.name = FindFileData.cFileName;
  78                 node.dir = FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  79                 if (node.name != "." && node.name != "..")
  80                         listing.push_back(node);
  81
  82                 // List all the other files in the directory.
  83                 while (FindNextFile(hFind, &FindFileData) != 0) {
  84                         DirListNode node;
  85                         node.name = FindFileData.cFileName;
  86                         node.dir = FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  87                         if(node.name != "." && node.name != "..")
  88                                 listing.push_back(node);
  89                 }
  90
  91                 dwError = GetLastError();
  92                 FindClose(hFind);
  93                 if (dwError != ERROR_NO_MORE_FILES) {
  94                         errorstream << "GetDirListing: FindNextFile error."
  95                                         << " Error is " << dwError << std::endl;
  96                         listing.clear();
  97                         return listing;
  98                 }
  99         }
 100         return listing;
 101 }
 102
 103 bool CreateDir(const std::string &path)
 104 {
 105         bool r = CreateDirectory(path.c_str(), NULL);
 106         if(r == true)
 107                 return true;
 108         if(GetLastError() == ERROR_ALREADY_EXISTS)
 109                 return true;
 110         return false;
 111 }
 112
 113 bool PathExists(const std::string &path)
 114 {
 115         return (GetFileAttributes(path.c_str()) != INVALID_FILE_ATTRIBUTES);
 116 }
 117
 118 bool IsPathAbsolute(const std::string &path)
 119 {
 120         return !PathIsRelative(path.c_str());
 121 }
 122
 123 bool IsDir(const std::string &path)
 124 {
 125         DWORD attr = GetFileAttributes(path.c_str());
 126         return (attr != INVALID_FILE_ATTRIBUTES &&
 127                         (attr & FILE_ATTRIBUTE_DIRECTORY));
 128 }
 129
 130 bool IsDirDelimiter(char c)
 131 {
 132         return c == '/' || c == '\\';
 133 }
 134
 135 bool RecursiveDelete(const std::string &path)
 136 {
 137         infostream << "Recursively deleting \"" << path << "\"" << std::endl;
 138         if (!IsDir(path)) {
 139                 infostream << "RecursiveDelete: Deleting file  " << path << std::endl;
 140                 if (!DeleteFile(path.c_str())) {
 141                         errorstream << "RecursiveDelete: Failed to delete file "
 142                                         << path << std::endl;
 143                         return false;
 144                 }
 145                 return true;
 146         }
 147         infostream << "RecursiveDelete: Deleting content of directory "
 148                         << path << std::endl;
 149         std::vector<DirListNode> content = GetDirListing(path);
 150         for (const DirListNode &n: content) {
 151                 std::string fullpath = path + DIR_DELIM + n.name;
 152                 if (!RecursiveDelete(fullpath)) {
 153                         errorstream << "RecursiveDelete: Failed to recurse to "
 154                                         << fullpath << std::endl;
 155                         return false;
 156                 }
 157         }
 158         infostream << "RecursiveDelete: Deleting directory " << path << std::endl;
 159         if (!RemoveDirectory(path.c_str())) {
 160                 errorstream << "Failed to recursively delete directory "
 161                                 << path << std::endl;
 162                 return false;
 163         }
 164         return true;
 165 }
 166
 167 bool DeleteSingleFileOrEmptyDirectory(const std::string &path)
 168 {
 169         DWORD attr = GetFileAttributes(path.c_str());
 170         bool is_directory = (attr != INVALID_FILE_ATTRIBUTES &&
 171                         (attr & FILE_ATTRIBUTE_DIRECTORY));
 172         if(!is_directory)
 173         {
 174                 bool did = DeleteFile(path.c_str());
 175                 return did;
 176         }
 177         else
 178         {
 179                 bool did = RemoveDirectory(path.c_str());
 180                 return did;
 181         }
 182 }
 183
 184 std::string TempPath()
 185 {
 186         DWORD bufsize = GetTempPath(0, NULL);
 187         if(bufsize == 0){
 188                 errorstream<<"GetTempPath failed, error = "<<GetLastError()<<std::endl;
 189                 return "";
 190         }
 191         std::string buf;
 192         buf.resize(bufsize);
 193         DWORD len = GetTempPath(bufsize, &buf[0]);
 194         if(len == 0 || len > bufsize){
 195                 errorstream<<"GetTempPath failed, error = "<<GetLastError()<<std::endl;
 196                 return "";
 197         }
 198         buf.resize(len);
 199         return buf;
 200 }
 201
 202 std::string CreateTempFile()
 203 {
 204         std::string path = TempPath() + DIR_DELIM "MT_XXXXXX";
 205         _mktemp_s(&path[0], path.size() + 1); // modifies path
 206         HANDLE file = CreateFile(path.c_str(), GENERIC_WRITE, 0, nullptr,
 207                 CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
 208         if (file == INVALID_HANDLE_VALUE)
 209                 return "";
 210         CloseHandle(file);
 211         return path;
 212 }
 213
 214 #else
 215
 216 /*********
 217  * POSIX *
 218  *********/
 219
 220 #include <sys/types.h>
 221 #include <dirent.h>
 222 #include <sys/stat.h>
 223 #include <sys/wait.h>
 224 #include <unistd.h>
 225
 226 std::vector<DirListNode> GetDirListing(const std::string &pathstring)
 227 {
 228         std::vector<DirListNode> listing;
 229
 230         DIR *dp;
 231         struct dirent *dirp;
 232         if((dp = opendir(pathstring.c_str())) == NULL) {
 233                 //infostream<<"Error("<<errno<<") opening "<<pathstring<<std::endl;
 234                 return listing;
 235         }
 236
 237         while ((dirp = readdir(dp)) != NULL) {
 238                 // NOTE:
 239                 // Be very sure to not include '..' in the results, it will
 240                 // result in an epic failure when deleting stuff.
 241                 if(strcmp(dirp->d_name, ".") == 0 || strcmp(dirp->d_name, "..") == 0)
 242                         continue;
 243
 244                 DirListNode node;
 245                 node.name = dirp->d_name;
 246
 247                 int isdir = -1; // -1 means unknown
 248
 249                 /*
 250                         POSIX doesn't define d_type member of struct dirent and
 251                         certain filesystems on glibc/Linux will only return
 252                         DT_UNKNOWN for the d_type member.
 253
 254                         Also we don't know whether symlinks are directories or not.
 255                 */
 256 #ifdef _DIRENT_HAVE_D_TYPE
 257                 if(dirp->d_type != DT_UNKNOWN && dirp->d_type != DT_LNK)
 258                         isdir = (dirp->d_type == DT_DIR);
 259 #endif /* _DIRENT_HAVE_D_TYPE */
 260
 261                 /*
 262                         Was d_type DT_UNKNOWN, DT_LNK or nonexistent?
 263                         If so, try stat().
 264                 */
 265                 if(isdir == -1) {
 266                         struct stat statbuf{};
 267                         if (stat((pathstring + "/" + node.name).c_str(), &statbuf))
 268                                 continue;
 269                         isdir = ((statbuf.st_mode & S_IFDIR) == S_IFDIR);
 270                 }
 271                 node.dir = isdir;
 272                 listing.push_back(node);
 273         }
 274         closedir(dp);
 275
 276         return listing;
 277 }
 278
 279 bool CreateDir(const std::string &path)
 280 {
 281         int r = mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
 282         if (r == 0) {
 283                 return true;
 284         }
 285
 286         // If already exists, return true
 287         if (errno == EEXIST)
 288                 return true;
 289         return false;
 290
 291 }
 292
 293 bool PathExists(const std::string &path)
 294 {
 295         struct stat st{};
 296         return (stat(path.c_str(),&st) == 0);
 297 }
 298
 299 bool IsPathAbsolute(const std::string &path)
 300 {
 301         return path[0] == '/';
 302 }
 303
 304 bool IsDir(const std::string &path)
 305 {
 306         struct stat statbuf{};
 307         if(stat(path.c_str(), &statbuf))
 308                 return false; // Actually error; but certainly not a directory
 309         return ((statbuf.st_mode & S_IFDIR) == S_IFDIR);
 310 }
 311
 312 bool IsDirDelimiter(char c)
 313 {
 314         return c == '/';
 315 }
 316
 317 bool RecursiveDelete(const std::string &path)
 318 {
 319         /*
 320                 Execute the 'rm' command directly, by fork() and execve()
 321         */
 322
 323         infostream<<"Removing \""<<path<<"\""<<std::endl;
 324
 325         pid_t child_pid = fork();
 326
 327         if(child_pid == 0)
 328         {
 329                 // Child
 330                 const char *argv[4] = {
 331 #ifdef __ANDROID__
 332                         "/system/bin/rm",
 333 #else
 334                         "/bin/rm",
 335 #endif
 336                         "-rf",
 337                         path.c_str(),
 338                         NULL
 339                 };
 340
 341                 verbosestream<<"Executing '"<<argv[0]<<"' '"<<argv[1]<<"' '"
 342                                 <<argv[2]<<"'"<<std::endl;
 343
 344                 execv(argv[0], const_cast<char**>(argv));
 345
 346                 // Execv shouldn't return. Failed.
 347                 _exit(1);
 348         }
 349         else
 350         {
 351                 // Parent
 352                 int child_status;
 353                 pid_t tpid;
 354                 do{
 355                         tpid = wait(&child_status);
 356                 }while(tpid != child_pid);
 357                 return (child_status == 0);
 358         }
 359 }
 360
 361 bool DeleteSingleFileOrEmptyDirectory(const std::string &path)
 362 {
 363         if (IsDir(path)) {
 364                 bool did = (rmdir(path.c_str()) == 0);
 365                 if (!did)
 366                         errorstream << "rmdir errno: " << errno << ": " << strerror(errno)
 367                                         << std::endl;
 368                 return did;
 369         }
 370
 371         bool did = (unlink(path.c_str()) == 0);
 372         if (!did)
 373                 errorstream << "unlink errno: " << errno << ": " << strerror(errno)
 374                                 << std::endl;
 375         return did;
 376 }
 377
 378 std::string TempPath()
 379 {
 380         /*
 381                 Should the environment variables TMPDIR, TMP and TEMP
 382                 and the macro P_tmpdir (if defined by stdio.h) be checked
 383                 before falling back on /tmp?
 384
 385                 Probably not, because this function is intended to be
 386                 compatible with lua's os.tmpname which under the default
 387                 configuration hardcodes mkstemp("/tmp/lua_XXXXXX").
 388         */
 389
 390 #ifdef __ANDROID__
 391         return porting::path_cache;
 392 #else
 393         return DIR_DELIM "tmp";
 394 #endif
 395 }
 396
 397 std::string CreateTempFile()
 398 {
 399         std::string path = TempPath() + DIR_DELIM "MT_XXXXXX";
 400         int fd = mkstemp(&path[0]); // modifies path
 401         if (fd == -1)
 402                 return "";
 403         close(fd);
 404         return path;
 405 }
 406
 407 #endif
 408
 409 /****************************
 410  * portable implementations *
 411  ****************************/
 412
 413 void GetRecursiveDirs(std::vector<std::string> &dirs, const std::string &dir)
 414 {
 415         static const std::set<char> chars_to_ignore = { '_', '.' };
 416         if (dir.empty() || !IsDir(dir))
 417                 return;
 418         dirs.push_back(dir);
 419         fs::GetRecursiveSubPaths(dir, dirs, false, chars_to_ignore);
 420 }
 421
 422 std::vector<std::string> GetRecursiveDirs(const std::string &dir)
 423 {
 424         std::vector<std::string> result;
 425         GetRecursiveDirs(result, dir);
 426         return result;
 427 }
 428
 429 void GetRecursiveSubPaths(const std::string &path,
 430                   std::vector<std::string> &dst,
 431                   bool list_files,
 432                   const std::set<char> &ignore)
 433 {
 434         std::vector<DirListNode> content = GetDirListing(path);
 435         for (const auto &n : content) {
 436                 std::string fullpath = path + DIR_DELIM + n.name;
 437                 if (ignore.count(n.name[0]))
 438                         continue;
 439                 if (list_files || n.dir)
 440                         dst.push_back(fullpath);
 441                 if (n.dir)
 442                         GetRecursiveSubPaths(fullpath, dst, list_files, ignore);
 443         }
 444 }
 445
 446 bool RecursiveDeleteContent(const std::string &path)
 447 {
 448         infostream<<"Removing content of \""<<path<<"\""<<std::endl;
 449         std::vector<DirListNode> list = GetDirListing(path);
 450         for (const DirListNode &dln : list) {
 451                 if(trim(dln.name) == "." || trim(dln.name) == "..")
 452                         continue;
 453                 std::string childpath = path + DIR_DELIM + dln.name;
 454                 bool r = RecursiveDelete(childpath);
 455                 if(!r) {
 456                         errorstream << "Removing \"" << childpath << "\" failed" << std::endl;
 457                         return false;
 458                 }
 459         }
 460         return true;
 461 }
 462
 463 bool CreateAllDirs(const std::string &path)
 464 {
 465
 466         std::vector<std::string> tocreate;
 467         std::string basepath = path;
 468         while(!PathExists(basepath))
 469         {
 470                 tocreate.push_back(basepath);
 471                 basepath = RemoveLastPathComponent(basepath);
 472                 if(basepath.empty())
 473                         break;
 474         }
 475         for(int i=tocreate.size()-1;i>=0;i--)
 476                 if(!CreateDir(tocreate[i]))
 477                         return false;
 478         return true;
 479 }
 480
 481 bool CopyFileContents(const std::string &source, const std::string &target)
 482 {
 483         FILE *sourcefile = fopen(source.c_str(), "rb");
 484         if(sourcefile == NULL){
 485                 errorstream<<source<<": can't open for reading: "
 486                         <<strerror(errno)<<std::endl;
 487                 return false;
 488         }
 489
 490         FILE *targetfile = fopen(target.c_str(), "wb");
 491         if(targetfile == NULL){
 492                 errorstream<<target<<": can't open for writing: "
 493                         <<strerror(errno)<<std::endl;
 494                 fclose(sourcefile);
 495                 return false;
 496         }
 497
 498         size_t total = 0;
 499         bool retval = true;
 500         bool done = false;
 501         char readbuffer[BUFSIZ];
 502         while(!done){
 503                 size_t readbytes = fread(readbuffer, 1,
 504                                 sizeof(readbuffer), sourcefile);
 505                 total += readbytes;
 506                 if(ferror(sourcefile)){
 507                         errorstream<<source<<": IO error: "
 508                                 <<strerror(errno)<<std::endl;
 509                         retval = false;
 510                         done = true;
 511                 }
 512                 if(readbytes > 0){
 513                         fwrite(readbuffer, 1, readbytes, targetfile);
 514                 }
 515                 if(feof(sourcefile) || ferror(sourcefile)){
 516                         // flush destination file to catch write errors
 517                         // (e.g. disk full)
 518                         fflush(targetfile);
 519                         done = true;
 520                 }
 521                 if(ferror(targetfile)){
 522                         errorstream<<target<<": IO error: "
 523                                         <<strerror(errno)<<std::endl;
 524                         retval = false;
 525                         done = true;
 526                 }
 527         }
 528         infostream<<"copied "<<total<<" bytes from "
 529                 <<source<<" to "<<target<<std::endl;
 530         fclose(sourcefile);
 531         fclose(targetfile);
 532         return retval;
 533 }
 534
 535 bool CopyDir(const std::string &source, const std::string &target)
 536 {
 537         if(PathExists(source)){
 538                 if(!PathExists(target)){
 539                         fs::CreateAllDirs(target);
 540                 }
 541                 bool retval = true;
 542                 std::vector<DirListNode> content = fs::GetDirListing(source);
 543
 544                 for (const auto &dln : content) {
 545                         std::string sourcechild = source + DIR_DELIM + dln.name;
 546                         std::string targetchild = target + DIR_DELIM + dln.name;
 547                         if(dln.dir){
 548                                 if(!fs::CopyDir(sourcechild, targetchild)){
 549                                         retval = false;
 550                                 }
 551                         }
 552                         else {
 553                                 if(!fs::CopyFileContents(sourcechild, targetchild)){
 554                                         retval = false;
 555                                 }
 556                         }
 557                 }
 558                 return retval;
 559         }
 560
 561         return false;
 562 }
 563
 564 bool MoveDir(const std::string &source, const std::string &target)
 565 {
 566         infostream << "Moving \"" << source << "\" to \"" << target << "\"" << std::endl;
 567
 568         // If target exists as empty folder delete, otherwise error
 569         if (fs::PathExists(target)) {
 570                 if (rmdir(target.c_str()) != 0) {
 571                         errorstream << "MoveDir: target \"" << target
 572                                 << "\" exists as file or non-empty folder" << std::endl;
 573                         return false;
 574                 }
 575         }
 576
 577         // Try renaming first which is instant
 578         if (fs::Rename(source, target))
 579                 return true;
 580
 581         infostream << "MoveDir: rename not possible, will copy instead" << std::endl;
 582         bool retval = fs::CopyDir(source, target);
 583         if (retval)
 584                 retval &= fs::RecursiveDelete(source);
 585         return retval;
 586 }
 587
 588 bool PathStartsWith(const std::string &path, const std::string &prefix)
 589 {
 590         size_t pathsize = path.size();
 591         size_t pathpos = 0;
 592         size_t prefixsize = prefix.size();
 593         size_t prefixpos = 0;
 594         for(;;){
 595                 bool delim1 = pathpos == pathsize
 596                         || IsDirDelimiter(path[pathpos]);
 597                 bool delim2 = prefixpos == prefixsize
 598                         || IsDirDelimiter(prefix[prefixpos]);
 599
 600                 if(delim1 != delim2)
 601                         return false;
 602
 603                 if(delim1){
 604                         while(pathpos < pathsize &&
 605                                         IsDirDelimiter(path[pathpos]))
 606                                 ++pathpos;
 607                         while(prefixpos < prefixsize &&
 608                                         IsDirDelimiter(prefix[prefixpos]))
 609                                 ++prefixpos;
 610                         if(prefixpos == prefixsize)
 611                                 return true;
 612                         if(pathpos == pathsize)
 613                                 return false;
 614                 }
 615                 else{
 616                         size_t len = 0;
 617                         do{
 618                                 char pathchar = path[pathpos+len];
 619                                 char prefixchar = prefix[prefixpos+len];
 620                                 if(FILESYS_CASE_INSENSITIVE){
 621                                         pathchar = tolower(pathchar);
 622                                         prefixchar = tolower(prefixchar);
 623                                 }
 624                                 if(pathchar != prefixchar)
 625                                         return false;
 626                                 ++len;
 627                         } while(pathpos+len < pathsize
 628                                         && !IsDirDelimiter(path[pathpos+len])
 629                                         && prefixpos+len < prefixsize
 630                                         && !IsDirDelimiter(
 631                                                 prefix[prefixpos+len]));
 632                         pathpos += len;
 633                         prefixpos += len;
 634                 }
 635         }
 636 }
 637
 638 std::string RemoveLastPathComponent(const std::string &path,
 639                 std::string *removed, int count)
 640 {
 641         if(removed)
 642                 removed->clear();
 643
 644         size_t remaining = path.size();
 645
 646         for(int i = 0; i < count; ++i){
 647                 // strip a dir delimiter
 648                 while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
 649                         remaining--;
 650                 // strip a path component
 651                 size_t component_end = remaining;
 652                 while(remaining != 0 && !IsDirDelimiter(path[remaining-1]))
 653                         remaining--;
 654                 size_t component_start = remaining;
 655                 // strip a dir delimiter
 656                 while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
 657                         remaining--;
 658                 if(removed){
 659                         std::string component = path.substr(component_start,
 660                                         component_end - component_start);
 661                         if(i)
 662                                 *removed = component + DIR_DELIM + *removed;
 663                         else
 664                                 *removed = component;
 665                 }
 666         }
 667         return path.substr(0, remaining);
 668 }
 669
 670 std::string RemoveRelativePathComponents(std::string path)
 671 {
 672         size_t pos = path.size();
 673         size_t dotdot_count = 0;
 674         while (pos != 0) {
 675                 size_t component_with_delim_end = pos;
 676                 // skip a dir delimiter
 677                 while (pos != 0 && IsDirDelimiter(path[pos-1]))
 678                         pos--;
 679                 // strip a path component
 680                 size_t component_end = pos;
 681                 while (pos != 0 && !IsDirDelimiter(path[pos-1]))
 682                         pos--;
 683                 size_t component_start = pos;
 684
 685                 std::string component = path.substr(component_start,
 686                                 component_end - component_start);
 687                 bool remove_this_component = false;
 688                 if (component == ".") {
 689                         remove_this_component = true;
 690                 } else if (component == "..") {
 691                         remove_this_component = true;
 692                         dotdot_count += 1;
 693                 } else if (dotdot_count != 0) {
 694                         remove_this_component = true;
 695                         dotdot_count -= 1;
 696                 }
 697
 698                 if (remove_this_component) {
 699                         while (pos != 0 && IsDirDelimiter(path[pos-1]))
 700                                 pos--;
 701                         if (component_start == 0) {
 702                                 // We need to remove the delemiter too
 703                                 path = path.substr(component_with_delim_end, std::string::npos);
 704                         } else {
 705                                 path = path.substr(0, pos) + DIR_DELIM +
 706                                         path.substr(component_with_delim_end, std::string::npos);
 707                         }
 708                         if (pos > 0)
 709                                 pos++;
 710                 }
 711         }
 712
 713         if (dotdot_count > 0)
 714                 return "";
 715
 716         // remove trailing dir delimiters
 717         pos = path.size();
 718         while (pos != 0 && IsDirDelimiter(path[pos-1]))
 719                 pos--;
 720         return path.substr(0, pos);
 721 }
 722
 723 std::string AbsolutePath(const std::string &path)
 724 {
 725 #ifdef _WIN32
 726         char *abs_path = _fullpath(NULL, path.c_str(), MAX_PATH);
 727 #else
 728         char *abs_path = realpath(path.c_str(), NULL);
 729 #endif
 730         if (!abs_path) return "";
 731         std::string abs_path_str(abs_path);
 732         free(abs_path);
 733         return abs_path_str;
 734 }
 735
 736 const char *GetFilenameFromPath(const char *path)
 737 {
 738         const char *filename = strrchr(path, DIR_DELIM_CHAR);
 739         // Consistent with IsDirDelimiter this function handles '/' too
 740         if (DIR_DELIM_CHAR != '/') {
 741                 const char *tmp = strrchr(path, '/');
 742                 if (tmp && tmp > filename)
 743                         filename = tmp;
 744         }
 745         return filename ? filename + 1 : path;
 746 }
 747
 748 bool safeWriteToFile(const std::string &path, const std::string &content)
 749 {
 750         std::string tmp_file = path + ".~mt";
 751
 752         // Write to a tmp file
 753         std::ofstream os(tmp_file.c_str(), std::ios::binary);
 754         if (!os.good())
 755                 return false;
 756         os << content;
 757         os.flush();
 758         os.close();
 759         if (os.fail()) {
 760                 // Remove the temporary file because writing it failed and it's useless.
 761                 remove(tmp_file.c_str());
 762                 return false;
 763         }
 764
 765         bool rename_success = false;
 766
 767         // Move the finished temporary file over the real file
 768 #ifdef _WIN32
 769         // When creating the file, it can cause Windows Search indexer, virus scanners and other apps
 770         // to query the file. This can make the move file call below fail.
 771         // We retry up to 5 times, with a 1ms sleep between, before we consider the whole operation failed
 772         int number_attempts = 0;
 773         while (number_attempts < 5) {
 774                 rename_success = MoveFileEx(tmp_file.c_str(), path.c_str(),
 775                                 MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH);
 776                 if (rename_success)
 777                         break;
 778                 sleep_ms(1);
 779                 ++number_attempts;
 780         }
 781 #else
 782         // On POSIX compliant systems rename() is specified to be able to swap the
 783         // file in place of the destination file, making this a truly error-proof
 784         // transaction.
 785         rename_success = rename(tmp_file.c_str(), path.c_str()) == 0;
 786 #endif
 787         if (!rename_success) {
 788                 warningstream << "Failed to write to file: " << path.c_str() << std::endl;
 789                 // Remove the temporary file because moving it over the target file
 790                 // failed.
 791                 remove(tmp_file.c_str());
 792                 return false;
 793         }
 794
 795         return true;
 796 }
 797
 798 #ifndef SERVER
 799 bool extractZipFile(io::IFileSystem *fs, const char *filename, const std::string &destination)
 800 {
 801         // Be careful here not to touch the global file hierarchy in Irrlicht
 802         // since this function needs to be thread-safe!
 803
 804         io::IArchiveLoader *zip_loader = nullptr;
 805         for (u32 i = 0; i < fs->getArchiveLoaderCount(); i++) {
 806                 if (fs->getArchiveLoader(i)->isALoadableFileFormat(io::EFAT_ZIP)) {
 807                         zip_loader = fs->getArchiveLoader(i);
 808                         break;
 809                 }
 810         }
 811         if (!zip_loader) {
 812                 warningstream << "fs::extractZipFile(): Irrlicht said it doesn't support ZIPs." << std::endl;
 813                 return false;
 814         }
 815
 816         irr_ptr<io::IFileArchive> opened_zip(zip_loader->createArchive(filename, false, false));
 817         const io::IFileList* files_in_zip = opened_zip->getFileList();
 818
 819         for (u32 i = 0; i < files_in_zip->getFileCount(); i++) {
 820                 std::string fullpath = destination + DIR_DELIM;
 821                 fullpath += files_in_zip->getFullFileName(i).c_str();
 822                 std::string fullpath_dir = fs::RemoveLastPathComponent(fullpath);
 823
 824                 if (files_in_zip->isDirectory(i))
 825                         continue; // ignore, we create dirs as necessary
 826
 827                 if (!fs::PathExists(fullpath_dir) && !fs::CreateAllDirs(fullpath_dir))
 828                         return false;
 829
 830                 irr_ptr<io::IReadFile> toread(opened_zip->createAndOpenFile(i));
 831
 832                 std::ofstream os(fullpath.c_str(), std::ios::binary);
 833                 if (!os.good())
 834                         return false;
 835
 836                 char buffer[4096];
 837                 long total_read = 0;
 838
 839                 while (total_read < toread->getSize()) {
 840                         long bytes_read = toread->read(buffer, sizeof(buffer));
 841                         bool error = true;
 842                         if (bytes_read != 0) {
 843                                 os.write(buffer, bytes_read);
 844                                 error = os.fail();
 845                         }
 846                         if (error) {
 847                                 os.close();
 848                                 remove(fullpath.c_str());
 849                                 return false;
 850                         }
 851                         total_read += bytes_read;
 852                 }
 853         }
 854
 855         return true;
 856 }
 857 #endif
 858
 859 bool ReadFile(const std::string &path, std::string &out)
 860 {
 861         std::ifstream is(path, std::ios::binary | std::ios::ate);
 862         if (!is.good()) {
 863                 return false;
 864         }
 865
 866         auto size = is.tellg();
 867         out.resize(size);
 868         is.seekg(0);
 869         is.read(&out[0], size);
 870
 871         return !is.fail();
 872 }
 873
 874 bool Rename(const std::string &from, const std::string &to)
 875 {
 876         return rename(from.c_str(), to.c_str()) == 0;
 877 }
 878
 879 } // namespace fs