src/win32/posix_w32.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "common.h"
   9
  10 #include "../posix.h"
  11 #include "../fileops.h"
  12 #include "path.h"
  13 #include "path_w32.h"
  14 #include "utf-conv.h"
  15 #include "repository.h"
  16 #include "reparse.h"
  17 #include "global.h"
  18 #include "buffer.h"
  19 #include <errno.h>
  20 #include <io.h>
  21 #include <fcntl.h>
  22 #include <ws2tcpip.h>
  23
  24 #ifndef FILE_NAME_NORMALIZED
  25 # define FILE_NAME_NORMALIZED 0
  26 #endif
  27
  28 #ifndef IO_REPARSE_TAG_SYMLINK
  29 #define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
  30 #endif
  31
  32 #ifndef SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
  33 # define SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE 0x02
  34 #endif
  35
  36 #ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
  37 # define SYMBOLIC_LINK_FLAG_DIRECTORY 0x01
  38 #endif
  39
  40 /* Allowable mode bits on Win32.  Using mode bits that are not supported on
  41  * Win32 (eg S_IRWXU) is generally ignored, but Wine warns loudly about it
  42  * so we simply remove them.
  43  */
  44 #define WIN32_MODE_MASK (_S_IREAD | _S_IWRITE)
  45
  46 unsigned long git_win32__createfile_sharemode =
  47  FILE_SHARE_READ | FILE_SHARE_WRITE;
  48 int git_win32__retries = 10;
  49
  50 GIT_INLINE(void) set_errno(void)
  51 {
  52         switch (GetLastError()) {
  53         case ERROR_FILE_NOT_FOUND:
  54         case ERROR_PATH_NOT_FOUND:
  55         case ERROR_INVALID_DRIVE:
  56         case ERROR_NO_MORE_FILES:
  57         case ERROR_BAD_NETPATH:
  58         case ERROR_BAD_NET_NAME:
  59         case ERROR_BAD_PATHNAME:
  60         case ERROR_FILENAME_EXCED_RANGE:
  61                 errno = ENOENT;
  62                 break;
  63         case ERROR_BAD_ENVIRONMENT:
  64                 errno = E2BIG;
  65                 break;
  66         case ERROR_BAD_FORMAT:
  67         case ERROR_INVALID_STARTING_CODESEG:
  68         case ERROR_INVALID_STACKSEG:
  69         case ERROR_INVALID_MODULETYPE:
  70         case ERROR_INVALID_EXE_SIGNATURE:
  71         case ERROR_EXE_MARKED_INVALID:
  72         case ERROR_BAD_EXE_FORMAT:
  73         case ERROR_ITERATED_DATA_EXCEEDS_64k:
  74         case ERROR_INVALID_MINALLOCSIZE:
  75         case ERROR_DYNLINK_FROM_INVALID_RING:
  76         case ERROR_IOPL_NOT_ENABLED:
  77         case ERROR_INVALID_SEGDPL:
  78         case ERROR_AUTODATASEG_EXCEEDS_64k:
  79         case ERROR_RING2SEG_MUST_BE_MOVABLE:
  80         case ERROR_RELOC_CHAIN_XEEDS_SEGLIM:
  81         case ERROR_INFLOOP_IN_RELOC_CHAIN:
  82                 errno = ENOEXEC;
  83                 break;
  84         case ERROR_INVALID_HANDLE:
  85         case ERROR_INVALID_TARGET_HANDLE:
  86         case ERROR_DIRECT_ACCESS_HANDLE:
  87                 errno = EBADF;
  88                 break;
  89         case ERROR_WAIT_NO_CHILDREN:
  90         case ERROR_CHILD_NOT_COMPLETE:
  91                 errno = ECHILD;
  92                 break;
  93         case ERROR_NO_PROC_SLOTS:
  94         case ERROR_MAX_THRDS_REACHED:
  95         case ERROR_NESTING_NOT_ALLOWED:
  96                 errno = EAGAIN;
  97                 break;
  98         case ERROR_ARENA_TRASHED:
  99         case ERROR_NOT_ENOUGH_MEMORY:
 100         case ERROR_INVALID_BLOCK:
 101         case ERROR_NOT_ENOUGH_QUOTA:
 102                 errno = ENOMEM;
 103                 break;
 104         case ERROR_ACCESS_DENIED:
 105         case ERROR_CURRENT_DIRECTORY:
 106         case ERROR_WRITE_PROTECT:
 107         case ERROR_BAD_UNIT:
 108         case ERROR_NOT_READY:
 109         case ERROR_BAD_COMMAND:
 110         case ERROR_CRC:
 111         case ERROR_BAD_LENGTH:
 112         case ERROR_SEEK:
 113         case ERROR_NOT_DOS_DISK:
 114         case ERROR_SECTOR_NOT_FOUND:
 115         case ERROR_OUT_OF_PAPER:
 116         case ERROR_WRITE_FAULT:
 117         case ERROR_READ_FAULT:
 118         case ERROR_GEN_FAILURE:
 119         case ERROR_SHARING_VIOLATION:
 120         case ERROR_LOCK_VIOLATION:
 121         case ERROR_WRONG_DISK:
 122         case ERROR_SHARING_BUFFER_EXCEEDED:
 123         case ERROR_NETWORK_ACCESS_DENIED:
 124         case ERROR_CANNOT_MAKE:
 125         case ERROR_FAIL_I24:
 126         case ERROR_DRIVE_LOCKED:
 127         case ERROR_SEEK_ON_DEVICE:
 128         case ERROR_NOT_LOCKED:
 129         case ERROR_LOCK_FAILED:
 130                 errno = EACCES;
 131                 break;
 132         case ERROR_FILE_EXISTS:
 133         case ERROR_ALREADY_EXISTS:
 134                 errno = EEXIST;
 135                 break;
 136         case ERROR_NOT_SAME_DEVICE:
 137                 errno = EXDEV;
 138                 break;
 139         case ERROR_INVALID_FUNCTION:
 140         case ERROR_INVALID_ACCESS:
 141         case ERROR_INVALID_DATA:
 142         case ERROR_INVALID_PARAMETER:
 143         case ERROR_NEGATIVE_SEEK:
 144                 errno = EINVAL;
 145                 break;
 146         case ERROR_TOO_MANY_OPEN_FILES:
 147                 errno = EMFILE;
 148                 break;
 149         case ERROR_DISK_FULL:
 150                 errno = ENOSPC;
 151                 break;
 152         case ERROR_BROKEN_PIPE:
 153                 errno = EPIPE;
 154                 break;
 155         case ERROR_DIR_NOT_EMPTY:
 156                 errno = ENOTEMPTY;
 157                 break;
 158         default:
 159                 errno = EINVAL;
 160         }
 161 }
 162
 163 GIT_INLINE(bool) last_error_retryable(void)
 164 {
 165         int os_error = GetLastError();
 166
 167         return (os_error == ERROR_SHARING_VIOLATION ||
 168                 os_error == ERROR_ACCESS_DENIED);
 169 }
 170
 171 #define do_with_retries(fn, remediation) \
 172         do {                                                             \
 173                 int __retry, __ret;                                          \
 174                 for (__retry = git_win32__retries; __retry; __retry--) {     \
 175                         if ((__ret = (fn)) != GIT_RETRY)                         \
 176                                 return __ret;                                        \
 177                         if (__retry > 1 && (__ret = (remediation)) != 0) {       \
 178                                 if (__ret == GIT_RETRY)                              \
 179                                         continue;                                        \
 180                                 return __ret;                                        \
 181                         }                                                        \
 182                         Sleep(5);                                                \
 183                 }                                                            \
 184                 return -1;                                                   \
 185         } while (0)                                                      \
 186
 187 static int ensure_writable(wchar_t *path)
 188 {
 189         DWORD attrs;
 190
 191         if ((attrs = GetFileAttributesW(path)) == INVALID_FILE_ATTRIBUTES)
 192                 goto on_error;
 193
 194         if ((attrs & FILE_ATTRIBUTE_READONLY) == 0)
 195                 return 0;
 196
 197         if (!SetFileAttributesW(path, (attrs & ~FILE_ATTRIBUTE_READONLY)))
 198                 goto on_error;
 199
 200         return GIT_RETRY;
 201
 202 on_error:
 203         set_errno();
 204         return -1;
 205 }
 206
 207 /**
 208  * Truncate or extend file.
 209  *
 210  * We now take a "git_off_t" rather than "long" because
 211  * files may be longer than 2Gb.
 212  */
 213 int p_ftruncate(int fd, git_off_t size)
 214 {
 215         if (size < 0) {
 216                 errno = EINVAL;
 217                 return -1;
 218         }
 219
 220 #if !defined(__MINGW32__) || defined(MINGW_HAS_SECURE_API)
 221         return ((_chsize_s(fd, size) == 0) ? 0 : -1);
 222 #else
 223         /* TODO MINGW32 Find a replacement for _chsize() that handles big files. */
 224         if (size > INT32_MAX) {
 225                 errno = EFBIG;
 226                 return -1;
 227         }
 228         return _chsize(fd, (long)size);
 229 #endif
 230 }
 231
 232 int p_mkdir(const char *path, mode_t mode)
 233 {
 234         git_win32_path buf;
 235
 236         GIT_UNUSED(mode);
 237
 238         if (git_win32_path_from_utf8(buf, path) < 0)
 239                 return -1;
 240
 241         return _wmkdir(buf);
 242 }
 243
 244 int p_link(const char *old, const char *new)
 245 {
 246         GIT_UNUSED(old);
 247         GIT_UNUSED(new);
 248         errno = ENOSYS;
 249         return -1;
 250 }
 251
 252 GIT_INLINE(int) unlink_once(const wchar_t *path)
 253 {
 254         if (DeleteFileW(path))
 255                 return 0;
 256
 257         if (last_error_retryable())
 258                 return GIT_RETRY;
 259
 260         set_errno();
 261         return -1;
 262 }
 263
 264 int p_unlink(const char *path)
 265 {
 266         git_win32_path wpath;
 267
 268         if (git_win32_path_from_utf8(wpath, path) < 0)
 269                 return -1;
 270
 271         do_with_retries(unlink_once(wpath), ensure_writable(wpath));
 272 }
 273
 274 int p_fsync(int fd)
 275 {
 276         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 277
 278         p_fsync__cnt++;
 279
 280         if (fh == INVALID_HANDLE_VALUE) {
 281                 errno = EBADF;
 282                 return -1;
 283         }
 284
 285         if (!FlushFileBuffers(fh)) {
 286                 DWORD code = GetLastError();
 287
 288                 if (code == ERROR_INVALID_HANDLE)
 289                         errno = EINVAL;
 290                 else
 291                         errno = EIO;
 292
 293                 return -1;
 294         }
 295
 296         return 0;
 297 }
 298
 299 #define WIN32_IS_WSEP(CH) ((CH) == L'/' || (CH) == L'\\')
 300
 301 static int lstat_w(
 302         wchar_t *path,
 303         struct stat *buf,
 304         bool posix_enotdir)
 305 {
 306         WIN32_FILE_ATTRIBUTE_DATA fdata;
 307
 308         if (GetFileAttributesExW(path, GetFileExInfoStandard, &fdata)) {
 309                 if (!buf)
 310                         return 0;
 311
 312                 return git_win32__file_attribute_to_stat(buf, &fdata, path);
 313         }
 314
 315         switch (GetLastError()) {
 316         case ERROR_ACCESS_DENIED:
 317                 errno = EACCES;
 318                 break;
 319         default:
 320                 errno = ENOENT;
 321                 break;
 322         }
 323
 324         /* To match POSIX behavior, set ENOTDIR when any of the folders in the
 325          * file path is a regular file, otherwise set ENOENT.
 326          */
 327         if (errno == ENOENT && posix_enotdir) {
 328                 size_t path_len = wcslen(path);
 329
 330                 /* scan up path until we find an existing item */
 331                 while (1) {
 332                         DWORD attrs;
 333
 334                         /* remove last directory component */
 335                         for (path_len--; path_len > 0 && !WIN32_IS_WSEP(path[path_len]); path_len--);
 336
 337                         if (path_len <= 0)
 338                                 break;
 339
 340                         path[path_len] = L'\0';
 341                         attrs = GetFileAttributesW(path);
 342
 343                         if (attrs != INVALID_FILE_ATTRIBUTES) {
 344                                 if (!(attrs & FILE_ATTRIBUTE_DIRECTORY))
 345                                         errno = ENOTDIR;
 346                                 break;
 347                         }
 348                 }
 349         }
 350
 351         return -1;
 352 }
 353
 354 static int do_lstat(const char *path, struct stat *buf, bool posixly_correct)
 355 {
 356         git_win32_path path_w;
 357         int len;
 358
 359         if ((len = git_win32_path_from_utf8(path_w, path)) < 0)
 360                 return -1;
 361
 362         git_win32_path_trim_end(path_w, len);
 363
 364         return lstat_w(path_w, buf, posixly_correct);
 365 }
 366
 367 int p_lstat(const char *filename, struct stat *buf)
 368 {
 369         return do_lstat(filename, buf, false);
 370 }
 371
 372 int p_lstat_posixly(const char *filename, struct stat *buf)
 373 {
 374         return do_lstat(filename, buf, true);
 375 }
 376
 377 int p_readlink(const char *path, char *buf, size_t bufsiz)
 378 {
 379         git_win32_path path_w, target_w;
 380         git_win32_utf8_path target;
 381         int len;
 382
 383         /* readlink(2) does not NULL-terminate the string written
 384          * to the target buffer. Furthermore, the target buffer need
 385          * not be large enough to hold the entire result. A truncated
 386          * result should be written in this case. Since this truncation
 387          * could occur in the middle of the encoding of a code point,
 388          * we need to buffer the result on the stack. */
 389
 390         if (git_win32_path_from_utf8(path_w, path) < 0 ||
 391                 git_win32_path_readlink_w(target_w, path_w) < 0 ||
 392                 (len = git_win32_path_to_utf8(target, target_w)) < 0)
 393                 return -1;
 394
 395         bufsiz = min((size_t)len, bufsiz);
 396         memcpy(buf, target, bufsiz);
 397
 398         return (int)bufsiz;
 399 }
 400
 401 int p_symlink(const char *target, const char *path)
 402 {
 403         git_win32_path target_w, path_w;
 404         DWORD dwFlags;
 405
 406         if (git_win32_path_from_utf8(path_w, path) < 0 ||
 407                 git__utf8_to_16(target_w, MAX_PATH, target) < 0)
 408                 return -1;
 409
 410         dwFlags = SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
 411
 412         if (GetFileAttributesW(target_w) & FILE_ATTRIBUTE_DIRECTORY)
 413                 dwFlags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
 414
 415         if (!CreateSymbolicLinkW(path_w, target_w, dwFlags))
 416                 return -1;
 417
 418         return 0;
 419 }
 420
 421 struct open_opts {
 422         DWORD access;
 423         DWORD sharing;
 424         SECURITY_ATTRIBUTES security;
 425         DWORD creation_disposition;
 426         DWORD attributes;
 427         int osf_flags;
 428 };
 429
 430 GIT_INLINE(void) open_opts_from_posix(struct open_opts *opts, int flags, mode_t mode)
 431 {
 432         memset(opts, 0, sizeof(struct open_opts));
 433
 434         switch (flags & (O_WRONLY | O_RDWR)) {
 435         case O_WRONLY:
 436                 opts->access = GENERIC_WRITE;
 437                 break;
 438         case O_RDWR:
 439                 opts->access = GENERIC_READ | GENERIC_WRITE;
 440                 break;
 441         default:
 442                 opts->access = GENERIC_READ;
 443                 break;
 444         }
 445
 446         opts->sharing = (DWORD)git_win32__createfile_sharemode;
 447
 448         switch (flags & (O_CREAT | O_TRUNC | O_EXCL)) {
 449         case O_CREAT | O_EXCL:
 450         case O_CREAT | O_TRUNC | O_EXCL:
 451                 opts->creation_disposition = CREATE_NEW;
 452                 break;
 453         case O_CREAT | O_TRUNC:
 454                 opts->creation_disposition = CREATE_ALWAYS;
 455                 break;
 456         case O_TRUNC:
 457                 opts->creation_disposition = TRUNCATE_EXISTING;
 458                 break;
 459         case O_CREAT:
 460                 opts->creation_disposition = OPEN_ALWAYS;
 461                 break;
 462         default:
 463                 opts->creation_disposition = OPEN_EXISTING;
 464                 break;
 465         }
 466
 467         opts->attributes = ((flags & O_CREAT) && !(mode & S_IWRITE)) ?
 468                 FILE_ATTRIBUTE_READONLY : FILE_ATTRIBUTE_NORMAL;
 469         opts->osf_flags = flags & (O_RDONLY | O_APPEND);
 470
 471         opts->security.nLength = sizeof(SECURITY_ATTRIBUTES);
 472         opts->security.lpSecurityDescriptor = NULL;
 473         opts->security.bInheritHandle = 0;
 474 }
 475
 476 GIT_INLINE(int) open_once(
 477         const wchar_t *path,
 478         struct open_opts *opts)
 479 {
 480         int fd;
 481
 482         HANDLE handle = CreateFileW(path, opts->access, opts->sharing,
 483                 &opts->security, opts->creation_disposition, opts->attributes, 0);
 484
 485         if (handle == INVALID_HANDLE_VALUE) {
 486                 if (last_error_retryable())
 487                         return GIT_RETRY;
 488
 489                 set_errno();
 490                 return -1;
 491         }
 492
 493         if ((fd = _open_osfhandle((intptr_t)handle, opts->osf_flags)) < 0)
 494                 CloseHandle(handle);
 495
 496         return fd;
 497 }
 498
 499 int p_open(const char *path, int flags, ...)
 500 {
 501         git_win32_path wpath;
 502         mode_t mode = 0;
 503         struct open_opts opts = {0};
 504
 505         if (git_win32_path_from_utf8(wpath, path) < 0)
 506                 return -1;
 507
 508         if (flags & O_CREAT) {
 509                 va_list arg_list;
 510
 511                 va_start(arg_list, flags);
 512                 mode = (mode_t)va_arg(arg_list, int);
 513                 va_end(arg_list);
 514         }
 515
 516         open_opts_from_posix(&opts, flags, mode);
 517
 518         do_with_retries(
 519                 open_once(wpath, &opts),
 520                 0);
 521 }
 522
 523 int p_creat(const char *path, mode_t mode)
 524 {
 525         return p_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
 526 }
 527
 528 int p_utimes(const char *path, const struct p_timeval times[2])
 529 {
 530         git_win32_path wpath;
 531         int fd, error;
 532         DWORD attrs_orig, attrs_new = 0;
 533         struct open_opts opts = { 0 };
 534
 535         if (git_win32_path_from_utf8(wpath, path) < 0)
 536                 return -1;
 537
 538         attrs_orig = GetFileAttributesW(wpath);
 539
 540         if (attrs_orig & FILE_ATTRIBUTE_READONLY) {
 541                 attrs_new = attrs_orig & ~FILE_ATTRIBUTE_READONLY;
 542
 543                 if (!SetFileAttributesW(wpath, attrs_new)) {
 544                         git_error_set(GIT_ERROR_OS, "failed to set attributes");
 545                         return -1;
 546                 }
 547         }
 548
 549         open_opts_from_posix(&opts, O_RDWR, 0);
 550
 551         if ((fd = open_once(wpath, &opts)) < 0) {
 552                 error = -1;
 553                 goto done;
 554         }
 555
 556         error = p_futimes(fd, times);
 557         close(fd);
 558
 559 done:
 560         if (attrs_orig != attrs_new) {
 561                 DWORD os_error = GetLastError();
 562                 SetFileAttributesW(wpath, attrs_orig);
 563                 SetLastError(os_error);
 564         }
 565
 566         return error;
 567 }
 568
 569 int p_futimes(int fd, const struct p_timeval times[2])
 570 {
 571         HANDLE handle;
 572         FILETIME atime = { 0 }, mtime = { 0 };
 573
 574         if (times == NULL) {
 575                 SYSTEMTIME st;
 576
 577                 GetSystemTime(&st);
 578                 SystemTimeToFileTime(&st, &atime);
 579                 SystemTimeToFileTime(&st, &mtime);
 580         }
 581         else {
 582                 git_win32__timeval_to_filetime(&atime, times[0]);
 583                 git_win32__timeval_to_filetime(&mtime, times[1]);
 584         }
 585
 586         if ((handle = (HANDLE)_get_osfhandle(fd)) == INVALID_HANDLE_VALUE)
 587                 return -1;
 588
 589         if (SetFileTime(handle, NULL, &atime, &mtime) == 0)
 590                 return -1;
 591
 592         return 0;
 593 }
 594
 595 int p_getcwd(char *buffer_out, size_t size)
 596 {
 597         git_win32_path buf;
 598         wchar_t *cwd = _wgetcwd(buf, GIT_WIN_PATH_UTF16);
 599
 600         if (!cwd)
 601                 return -1;
 602
 603         /* Convert the working directory back to UTF-8 */
 604         if (git__utf16_to_8(buffer_out, size, cwd) < 0) {
 605                 DWORD code = GetLastError();
 606
 607                 if (code == ERROR_INSUFFICIENT_BUFFER)
 608                         errno = ERANGE;
 609                 else
 610                         errno = EINVAL;
 611
 612                 return -1;
 613         }
 614
 615         return 0;
 616 }
 617
 618 static int getfinalpath_w(
 619         git_win32_path dest,
 620         const wchar_t *path)
 621 {
 622         HANDLE hFile;
 623         DWORD dwChars;
 624
 625         /* Use FILE_FLAG_BACKUP_SEMANTICS so we can open a directory. Do not
 626         * specify FILE_FLAG_OPEN_REPARSE_POINT; we want to open a handle to the
 627         * target of the link. */
 628         hFile = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_DELETE,
 629                 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
 630
 631         if (INVALID_HANDLE_VALUE == hFile)
 632                 return -1;
 633
 634         /* Call GetFinalPathNameByHandle */
 635         dwChars = GetFinalPathNameByHandleW(hFile, dest, GIT_WIN_PATH_UTF16, FILE_NAME_NORMALIZED);
 636         CloseHandle(hFile);
 637
 638         if (!dwChars || dwChars >= GIT_WIN_PATH_UTF16)
 639                 return -1;
 640
 641         /* The path may be delivered to us with a namespace prefix; remove */
 642         return (int)git_win32_path_remove_namespace(dest, dwChars);
 643 }
 644
 645 static int follow_and_lstat_link(git_win32_path path, struct stat* buf)
 646 {
 647         git_win32_path target_w;
 648
 649         if (getfinalpath_w(target_w, path) < 0)
 650                 return -1;
 651
 652         return lstat_w(target_w, buf, false);
 653 }
 654
 655 int p_fstat(int fd, struct stat *buf)
 656 {
 657         BY_HANDLE_FILE_INFORMATION fhInfo;
 658
 659         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 660
 661         if (fh == INVALID_HANDLE_VALUE ||
 662                 !GetFileInformationByHandle(fh, &fhInfo)) {
 663                 errno = EBADF;
 664                 return -1;
 665         }
 666
 667         git_win32__file_information_to_stat(buf, &fhInfo);
 668         return 0;
 669 }
 670
 671 int p_stat(const char* path, struct stat* buf)
 672 {
 673         git_win32_path path_w;
 674         int len;
 675
 676         if ((len = git_win32_path_from_utf8(path_w, path)) < 0 ||
 677                 lstat_w(path_w, buf, false) < 0)
 678                 return -1;
 679
 680         /* The item is a symbolic link or mount point. No need to iterate
 681          * to follow multiple links; use GetFinalPathNameFromHandle. */
 682         if (S_ISLNK(buf->st_mode))
 683                 return follow_and_lstat_link(path_w, buf);
 684
 685         return 0;
 686 }
 687
 688 int p_chdir(const char* path)
 689 {
 690         git_win32_path buf;
 691
 692         if (git_win32_path_from_utf8(buf, path) < 0)
 693                 return -1;
 694
 695         return _wchdir(buf);
 696 }
 697
 698 int p_chmod(const char* path, mode_t mode)
 699 {
 700         git_win32_path buf;
 701
 702         if (git_win32_path_from_utf8(buf, path) < 0)
 703                 return -1;
 704
 705         return _wchmod(buf, mode);
 706 }
 707
 708 int p_rmdir(const char* path)
 709 {
 710         git_win32_path buf;
 711         int error;
 712
 713         if (git_win32_path_from_utf8(buf, path) < 0)
 714                 return -1;
 715
 716         error = _wrmdir(buf);
 717
 718         if (error == -1) {
 719                 switch (GetLastError()) {
 720                         /* _wrmdir() is documented to return EACCES if "A program has an open
 721                          * handle to the directory."  This sounds like what everybody else calls
 722                          * EBUSY.  Let's convert appropriate error codes.
 723                          */
 724                         case ERROR_SHARING_VIOLATION:
 725                                 errno = EBUSY;
 726                                 break;
 727
 728                         /* This error can be returned when trying to rmdir an extant file. */
 729                         case ERROR_DIRECTORY:
 730                                 errno = ENOTDIR;
 731                                 break;
 732                 }
 733         }
 734
 735         return error;
 736 }
 737
 738 char *p_realpath(const char *orig_path, char *buffer)
 739 {
 740         git_win32_path orig_path_w, buffer_w;
 741
 742         if (git_win32_path_from_utf8(orig_path_w, orig_path) < 0)
 743                 return NULL;
 744
 745         /* Note that if the path provided is a relative path, then the current directory
 746          * is used to resolve the path -- which is a concurrency issue because the current
 747          * directory is a process-wide variable. */
 748         if (!GetFullPathNameW(orig_path_w, GIT_WIN_PATH_UTF16, buffer_w, NULL)) {
 749                 if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
 750                         errno = ENAMETOOLONG;
 751                 else
 752                         errno = EINVAL;
 753
 754                 return NULL;
 755         }
 756
 757         /* The path must exist. */
 758         if (GetFileAttributesW(buffer_w) == INVALID_FILE_ATTRIBUTES) {
 759                 errno = ENOENT;
 760                 return NULL;
 761         }
 762
 763         if (!buffer && !(buffer = git__malloc(GIT_WIN_PATH_UTF8))) {
 764                 errno = ENOMEM;
 765                 return NULL;
 766         }
 767
 768         /* Convert the path to UTF-8. If the caller provided a buffer, then it
 769          * is assumed to be GIT_WIN_PATH_UTF8 characters in size. If it isn't,
 770          * then we may overflow. */
 771         if (git_win32_path_to_utf8(buffer, buffer_w) < 0)
 772                 return NULL;
 773
 774         git_path_mkposix(buffer);
 775
 776         return buffer;
 777 }
 778
 779 int p_vsnprintf(char *buffer, size_t count, const char *format, va_list argptr)
 780 {
 781 #if defined(_MSC_VER)
 782         int len;
 783
 784         if (count == 0)
 785                 return _vscprintf(format, argptr);
 786
 787         #if _MSC_VER >= 1500
 788         len = _vsnprintf_s(buffer, count, _TRUNCATE, format, argptr);
 789         #else
 790         len = _vsnprintf(buffer, count, format, argptr);
 791         #endif
 792
 793         if (len < 0)
 794                 return _vscprintf(format, argptr);
 795
 796         return len;
 797 #else /* MinGW */
 798         return vsnprintf(buffer, count, format, argptr);
 799 #endif
 800 }
 801
 802 int p_snprintf(char *buffer, size_t count, const char *format, ...)
 803 {
 804         va_list va;
 805         int r;
 806
 807         va_start(va, format);
 808         r = p_vsnprintf(buffer, count, format, va);
 809         va_end(va);
 810
 811         return r;
 812 }
 813
 814 /* TODO: wut? */
 815 int p_mkstemp(char *tmp_path)
 816 {
 817 #if defined(_MSC_VER) && _MSC_VER >= 1500
 818         if (_mktemp_s(tmp_path, strlen(tmp_path) + 1) != 0)
 819                 return -1;
 820 #else
 821         if (_mktemp(tmp_path) == NULL)
 822                 return -1;
 823 #endif
 824
 825         return p_open(tmp_path, O_RDWR | O_CREAT | O_EXCL, 0744); /* -V536 */
 826 }
 827
 828 int p_access(const char* path, mode_t mode)
 829 {
 830         git_win32_path buf;
 831
 832         if (git_win32_path_from_utf8(buf, path) < 0)
 833                 return -1;
 834
 835         return _waccess(buf, mode & WIN32_MODE_MASK);
 836 }
 837
 838 GIT_INLINE(int) rename_once(const wchar_t *from, const wchar_t *to)
 839 {
 840         if (MoveFileExW(from, to, MOVEFILE_REPLACE_EXISTING | MOVEFILE_COPY_ALLOWED))
 841                 return 0;
 842
 843         if (last_error_retryable())
 844                 return GIT_RETRY;
 845
 846         set_errno();
 847         return -1;
 848 }
 849
 850 int p_rename(const char *from, const char *to)
 851 {
 852         git_win32_path wfrom, wto;
 853
 854         if (git_win32_path_from_utf8(wfrom, from) < 0 ||
 855                 git_win32_path_from_utf8(wto, to) < 0)
 856                 return -1;
 857
 858         do_with_retries(rename_once(wfrom, wto), ensure_writable(wto));
 859 }
 860
 861 int p_recv(GIT_SOCKET socket, void *buffer, size_t length, int flags)
 862 {
 863         if ((size_t)((int)length) != length)
 864                 return -1; /* git_error_set will be done by caller */
 865
 866         return recv(socket, buffer, (int)length, flags);
 867 }
 868
 869 int p_send(GIT_SOCKET socket, const void *buffer, size_t length, int flags)
 870 {
 871         if ((size_t)((int)length) != length)
 872                 return -1; /* git_error_set will be done by caller */
 873
 874         return send(socket, buffer, (int)length, flags);
 875 }
 876
 877 /**
 878  * Borrowed from http://old.nabble.com/Porting-localtime_r-and-gmtime_r-td15282276.html
 879  * On Win32, `gmtime_r` doesn't exist but `gmtime` is threadsafe, so we can use that
 880  */
 881 struct tm *
 882 p_localtime_r (const time_t *timer, struct tm *result)
 883 {
 884         struct tm *local_result;
 885         local_result = localtime (timer);
 886
 887         if (local_result == NULL || result == NULL)
 888                 return NULL;
 889
 890         memcpy (result, local_result, sizeof (struct tm));
 891         return result;
 892 }
 893 struct tm *
 894 p_gmtime_r (const time_t *timer, struct tm *result)
 895 {
 896         struct tm *local_result;
 897         local_result = gmtime (timer);
 898
 899         if (local_result == NULL || result == NULL)
 900                 return NULL;
 901
 902         memcpy (result, local_result, sizeof (struct tm));
 903         return result;
 904 }
 905
 906 int p_inet_pton(int af, const char *src, void *dst)
 907 {
 908         struct sockaddr_storage sin;
 909         void *addr;
 910         int sin_len = sizeof(struct sockaddr_storage), addr_len;
 911         int error = 0;
 912
 913         if (af == AF_INET) {
 914                 addr = &((struct sockaddr_in *)&sin)->sin_addr;
 915                 addr_len = sizeof(struct in_addr);
 916         } else if (af == AF_INET6) {
 917                 addr = &((struct sockaddr_in6 *)&sin)->sin6_addr;
 918                 addr_len = sizeof(struct in6_addr);
 919         } else {
 920                 errno = EAFNOSUPPORT;
 921                 return -1;
 922         }
 923
 924         if ((error = WSAStringToAddressA((LPSTR)src, af, NULL, (LPSOCKADDR)&sin, &sin_len)) == 0) {
 925                 memcpy(dst, addr, addr_len);
 926                 return 1;
 927         }
 928
 929         switch(WSAGetLastError()) {
 930         case WSAEINVAL:
 931                 return 0;
 932         case WSAEFAULT:
 933                 errno = ENOSPC;
 934                 return -1;
 935         case WSA_NOT_ENOUGH_MEMORY:
 936                 errno = ENOMEM;
 937                 return -1;
 938         }
 939
 940         errno = EINVAL;
 941         return -1;
 942 }