Andrew's git - gitweb.git/blob

   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include <wchar.h>
   5#include "../strbuf.h"
   6#include "../run-command.h"
   7#include "../cache.h"
   8
   9#define HCAST(type, handle) ((type)(intptr_t)handle)
  10
  11static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13int err_win_to_posix(DWORD winerr)
  14{
  15        int error = ENOSYS;
  16        switch(winerr) {
  17        case ERROR_ACCESS_DENIED: error = EACCES; break;
  18        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23        case ERROR_BAD_COMMAND: error = EIO; break;
  24        case ERROR_BAD_DEVICE: error = ENODEV; break;
  25        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28        case ERROR_BAD_LENGTH: error = EINVAL; break;
  29        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30        case ERROR_BAD_PIPE: error = EPIPE; break;
  31        case ERROR_BAD_UNIT: error = ENODEV; break;
  32        case ERROR_BAD_USERNAME: error = EINVAL; break;
  33        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35        case ERROR_BUSY: error = EBUSY; break;
  36        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38        case ERROR_CANNOT_MAKE: error = EACCES; break;
  39        case ERROR_CANTOPEN: error = EIO; break;
  40        case ERROR_CANTREAD: error = EIO; break;
  41        case ERROR_CANTWRITE: error = EIO; break;
  42        case ERROR_CRC: error = EIO; break;
  43        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46        case ERROR_DIRECTORY: error = EINVAL; break;
  47        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48        case ERROR_DISK_CHANGE: error = EIO; break;
  49        case ERROR_DISK_FULL: error = ENOSPC; break;
  50        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54        case ERROR_FILE_EXISTS: error = EEXIST; break;
  55        case ERROR_FILE_INVALID: error = ENODEV; break;
  56        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57        case ERROR_GEN_FAILURE: error = EIO; break;
  58        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60        case ERROR_INVALID_ACCESS: error = EACCES; break;
  61        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63        case ERROR_INVALID_DATA: error = EINVAL; break;
  64        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68        case ERROR_INVALID_HANDLE: error = EBADF; break;
  69        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70        case ERROR_INVALID_NAME: error = EINVAL; break;
  71        case ERROR_INVALID_OWNER: error = EINVAL; break;
  72        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78        case ERROR_IO_DEVICE: error = EIO; break;
  79        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80        case ERROR_LOCKED: error = EBUSY; break;
  81        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82        case ERROR_LOGON_FAILURE: error = EACCES; break;
  83        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85        case ERROR_MORE_DATA: error = EPIPE; break;
  86        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87        case ERROR_NOACCESS: error = EFAULT; break;
  88        case ERROR_NONE_MAPPED: error = EINVAL; break;
  89        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90        case ERROR_NOT_READY: error = EAGAIN; break;
  91        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92        case ERROR_NO_DATA: error = EPIPE; break;
  93        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96        case ERROR_OPEN_FAILED: error = EIO; break;
  97        case ERROR_OPEN_FILES: error = EBUSY; break;
  98        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101        case ERROR_PATH_BUSY: error = EBUSY; break;
 102        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103        case ERROR_PIPE_BUSY: error = EBUSY; break;
 104        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108        case ERROR_READ_FAULT: error = EIO; break;
 109        case ERROR_SEEK: error = EIO; break;
 110        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114        case ERROR_SWAPERROR: error = ENOENT; break;
 115        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120        case ERROR_WRITE_FAULT: error = EIO; break;
 121        case ERROR_WRITE_PROTECT: error = EROFS; break;
 122        }
 123        return error;
 124}
 125
 126static inline int is_file_in_use_error(DWORD errcode)
 127{
 128        switch (errcode) {
 129        case ERROR_SHARING_VIOLATION:
 130        case ERROR_ACCESS_DENIED:
 131                return 1;
 132        }
 133
 134        return 0;
 135}
 136
 137static int read_yes_no_answer(void)
 138{
 139        char answer[1024];
 140
 141        if (fgets(answer, sizeof(answer), stdin)) {
 142                size_t answer_len = strlen(answer);
 143                int got_full_line = 0, c;
 144
 145                /* remove the newline */
 146                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 147                        answer[answer_len-2] = '\0';
 148                        got_full_line = 1;
 149                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 150                        answer[answer_len-1] = '\0';
 151                        got_full_line = 1;
 152                }
 153                /* flush the buffer in case we did not get the full line */
 154                if (!got_full_line)
 155                        while ((c = getchar()) != EOF && c != '\n')
 156                                ;
 157        } else
 158                /* we could not read, return the
 159                 * default answer which is no */
 160                return 0;
 161
 162        if (tolower(answer[0]) == 'y' && !answer[1])
 163                return 1;
 164        if (!strncasecmp(answer, "yes", sizeof(answer)))
 165                return 1;
 166        if (tolower(answer[0]) == 'n' && !answer[1])
 167                return 0;
 168        if (!strncasecmp(answer, "no", sizeof(answer)))
 169                return 0;
 170
 171        /* did not find an answer we understand */
 172        return -1;
 173}
 174
 175static int ask_yes_no_if_possible(const char *format, ...)
 176{
 177        char question[4096];
 178        const char *retry_hook[] = { NULL, NULL, NULL };
 179        va_list args;
 180
 181        va_start(args, format);
 182        vsnprintf(question, sizeof(question), format, args);
 183        va_end(args);
 184
 185        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 186                retry_hook[1] = question;
 187                return !run_command_v_opt(retry_hook, 0);
 188        }
 189
 190        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 191                return 0;
 192
 193        while (1) {
 194                int answer;
 195                fprintf(stderr, "%s (y/n) ", question);
 196
 197                if ((answer = read_yes_no_answer()) >= 0)
 198                        return answer;
 199
 200                fprintf(stderr, "Sorry, I did not understand your answer. "
 201                                "Please type 'y' or 'n'\n");
 202        }
 203}
 204
 205int mingw_unlink(const char *pathname)
 206{
 207        int ret, tries = 0;
 208        wchar_t wpathname[MAX_PATH];
 209        if (xutftowcs_path(wpathname, pathname) < 0)
 210                return -1;
 211
 212        /* read-only files cannot be removed */
 213        _wchmod(wpathname, 0666);
 214        while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 215                if (!is_file_in_use_error(GetLastError()))
 216                        break;
 217                /*
 218                 * We assume that some other process had the source or
 219                 * destination file open at the wrong moment and retry.
 220                 * In order to give the other process a higher chance to
 221                 * complete its operation, we give up our time slice now.
 222                 * If we have to retry again, we do sleep a bit.
 223                 */
 224                Sleep(delay[tries]);
 225                tries++;
 226        }
 227        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 228               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 229                        "Should I try again?", pathname))
 230               ret = _wunlink(wpathname);
 231        return ret;
 232}
 233
 234static int is_dir_empty(const wchar_t *wpath)
 235{
 236        WIN32_FIND_DATAW findbuf;
 237        HANDLE handle;
 238        wchar_t wbuf[MAX_PATH + 2];
 239        wcscpy(wbuf, wpath);
 240        wcscat(wbuf, L"\\*");
 241        handle = FindFirstFileW(wbuf, &findbuf);
 242        if (handle == INVALID_HANDLE_VALUE)
 243                return GetLastError() == ERROR_NO_MORE_FILES;
 244
 245        while (!wcscmp(findbuf.cFileName, L".") ||
 246                        !wcscmp(findbuf.cFileName, L".."))
 247                if (!FindNextFileW(handle, &findbuf)) {
 248                        DWORD err = GetLastError();
 249                        FindClose(handle);
 250                        return err == ERROR_NO_MORE_FILES;
 251                }
 252        FindClose(handle);
 253        return 0;
 254}
 255
 256int mingw_rmdir(const char *pathname)
 257{
 258        int ret, tries = 0;
 259        wchar_t wpathname[MAX_PATH];
 260        if (xutftowcs_path(wpathname, pathname) < 0)
 261                return -1;
 262
 263        while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 264                if (!is_file_in_use_error(GetLastError()))
 265                        errno = err_win_to_posix(GetLastError());
 266                if (errno != EACCES)
 267                        break;
 268                if (!is_dir_empty(wpathname)) {
 269                        errno = ENOTEMPTY;
 270                        break;
 271                }
 272                /*
 273                 * We assume that some other process had the source or
 274                 * destination file open at the wrong moment and retry.
 275                 * In order to give the other process a higher chance to
 276                 * complete its operation, we give up our time slice now.
 277                 * If we have to retry again, we do sleep a bit.
 278                 */
 279                Sleep(delay[tries]);
 280                tries++;
 281        }
 282        while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 283               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 284                        "Should I try again?", pathname))
 285               ret = _wrmdir(wpathname);
 286        return ret;
 287}
 288
 289static inline int needs_hiding(const char *path)
 290{
 291        const char *basename;
 292
 293        if (hide_dotfiles == HIDE_DOTFILES_FALSE)
 294                return 0;
 295
 296        /* We cannot use basename(), as it would remove trailing slashes */
 297        mingw_skip_dos_drive_prefix((char **)&path);
 298        if (!*path)
 299                return 0;
 300
 301        for (basename = path; *path; path++)
 302                if (is_dir_sep(*path)) {
 303                        do {
 304                                path++;
 305                        } while (is_dir_sep(*path));
 306                        /* ignore trailing slashes */
 307                        if (*path)
 308                                basename = path;
 309                }
 310
 311        if (hide_dotfiles == HIDE_DOTFILES_TRUE)
 312                return *basename == '.';
 313
 314        assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
 315        return !strncasecmp(".git", basename, 4) &&
 316                (!basename[4] || is_dir_sep(basename[4]));
 317}
 318
 319static int set_hidden_flag(const wchar_t *path, int set)
 320{
 321        DWORD original = GetFileAttributesW(path), modified;
 322        if (set)
 323                modified = original | FILE_ATTRIBUTE_HIDDEN;
 324        else
 325                modified = original & ~FILE_ATTRIBUTE_HIDDEN;
 326        if (original == modified || SetFileAttributesW(path, modified))
 327                return 0;
 328        errno = err_win_to_posix(GetLastError());
 329        return -1;
 330}
 331
 332int mingw_mkdir(const char *path, int mode)
 333{
 334        int ret;
 335        wchar_t wpath[MAX_PATH];
 336        if (xutftowcs_path(wpath, path) < 0)
 337                return -1;
 338        ret = _wmkdir(wpath);
 339        if (!ret && needs_hiding(path))
 340                return set_hidden_flag(wpath, 1);
 341        return ret;
 342}
 343
 344int mingw_open (const char *filename, int oflags, ...)
 345{
 346        va_list args;
 347        unsigned mode;
 348        int fd;
 349        wchar_t wfilename[MAX_PATH];
 350
 351        va_start(args, oflags);
 352        mode = va_arg(args, int);
 353        va_end(args);
 354
 355        if (filename && !strcmp(filename, "/dev/null"))
 356                filename = "nul";
 357
 358        if (xutftowcs_path(wfilename, filename) < 0)
 359                return -1;
 360        fd = _wopen(wfilename, oflags, mode);
 361
 362        if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 363                DWORD attrs = GetFileAttributesW(wfilename);
 364                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 365                        errno = EISDIR;
 366        }
 367        if ((oflags & O_CREAT) && needs_hiding(filename)) {
 368                /*
 369                 * Internally, _wopen() uses the CreateFile() API which errors
 370                 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
 371                 * specified and an already existing file's attributes do not
 372                 * match *exactly*. As there is no mode or flag we can set that
 373                 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
 374                 * again *without* the O_CREAT flag (that corresponds to the
 375                 * CREATE_ALWAYS flag of CreateFile()).
 376                 */
 377                if (fd < 0 && errno == EACCES)
 378                        fd = _wopen(wfilename, oflags & ~O_CREAT, mode);
 379                if (fd >= 0 && set_hidden_flag(wfilename, 1))
 380                        warning("could not mark '%s' as hidden.", filename);
 381        }
 382        return fd;
 383}
 384
 385static BOOL WINAPI ctrl_ignore(DWORD type)
 386{
 387        return TRUE;
 388}
 389
 390#undef fgetc
 391int mingw_fgetc(FILE *stream)
 392{
 393        int ch;
 394        if (!isatty(_fileno(stream)))
 395                return fgetc(stream);
 396
 397        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 398        while (1) {
 399                ch = fgetc(stream);
 400                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 401                        break;
 402
 403                /* Ctrl+C was pressed, simulate SIGINT and retry */
 404                mingw_raise(SIGINT);
 405        }
 406        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 407        return ch;
 408}
 409
 410#undef fopen
 411FILE *mingw_fopen (const char *filename, const char *otype)
 412{
 413        int hide = needs_hiding(filename);
 414        FILE *file;
 415        wchar_t wfilename[MAX_PATH], wotype[4];
 416        if (filename && !strcmp(filename, "/dev/null"))
 417                filename = "nul";
 418        if (xutftowcs_path(wfilename, filename) < 0 ||
 419                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 420                return NULL;
 421        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 422                error("could not unhide %s", filename);
 423                return NULL;
 424        }
 425        file = _wfopen(wfilename, wotype);
 426        if (!file && GetLastError() == ERROR_INVALID_NAME)
 427                errno = ENOENT;
 428        if (file && hide && set_hidden_flag(wfilename, 1))
 429                warning("could not mark '%s' as hidden.", filename);
 430        return file;
 431}
 432
 433FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 434{
 435        int hide = needs_hiding(filename);
 436        FILE *file;
 437        wchar_t wfilename[MAX_PATH], wotype[4];
 438        if (filename && !strcmp(filename, "/dev/null"))
 439                filename = "nul";
 440        if (xutftowcs_path(wfilename, filename) < 0 ||
 441                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 442                return NULL;
 443        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 444                error("could not unhide %s", filename);
 445                return NULL;
 446        }
 447        file = _wfreopen(wfilename, wotype, stream);
 448        if (file && hide && set_hidden_flag(wfilename, 1))
 449                warning("could not mark '%s' as hidden.", filename);
 450        return file;
 451}
 452
 453#undef fflush
 454int mingw_fflush(FILE *stream)
 455{
 456        int ret = fflush(stream);
 457
 458        /*
 459         * write() is used behind the scenes of stdio output functions.
 460         * Since git code does not check for errors after each stdio write
 461         * operation, it can happen that write() is called by a later
 462         * stdio function even if an earlier write() call failed. In the
 463         * case of a pipe whose readable end was closed, only the first
 464         * call to write() reports EPIPE on Windows. Subsequent write()
 465         * calls report EINVAL. It is impossible to notice whether this
 466         * fflush invocation triggered such a case, therefore, we have to
 467         * catch all EINVAL errors whole-sale.
 468         */
 469        if (ret && errno == EINVAL)
 470                errno = EPIPE;
 471
 472        return ret;
 473}
 474
 475#undef write
 476ssize_t mingw_write(int fd, const void *buf, size_t len)
 477{
 478        ssize_t result = write(fd, buf, len);
 479
 480        if (result < 0 && errno == EINVAL && buf) {
 481                /* check if fd is a pipe */
 482                HANDLE h = (HANDLE) _get_osfhandle(fd);
 483                if (GetFileType(h) == FILE_TYPE_PIPE)
 484                        errno = EPIPE;
 485                else
 486                        errno = EINVAL;
 487        }
 488
 489        return result;
 490}
 491
 492int mingw_access(const char *filename, int mode)
 493{
 494        wchar_t wfilename[MAX_PATH];
 495        if (xutftowcs_path(wfilename, filename) < 0)
 496                return -1;
 497        /* X_OK is not supported by the MSVCRT version */
 498        return _waccess(wfilename, mode & ~X_OK);
 499}
 500
 501int mingw_chdir(const char *dirname)
 502{
 503        wchar_t wdirname[MAX_PATH];
 504        if (xutftowcs_path(wdirname, dirname) < 0)
 505                return -1;
 506        return _wchdir(wdirname);
 507}
 508
 509int mingw_chmod(const char *filename, int mode)
 510{
 511        wchar_t wfilename[MAX_PATH];
 512        if (xutftowcs_path(wfilename, filename) < 0)
 513                return -1;
 514        return _wchmod(wfilename, mode);
 515}
 516
 517/*
 518 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 519 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 520 */
 521static inline long long filetime_to_hnsec(const FILETIME *ft)
 522{
 523        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 524        /* Windows to Unix Epoch conversion */
 525        return winTime - 116444736000000000LL;
 526}
 527
 528static inline time_t filetime_to_time_t(const FILETIME *ft)
 529{
 530        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 531}
 532
 533/**
 534 * Verifies that safe_create_leading_directories() would succeed.
 535 */
 536static int has_valid_directory_prefix(wchar_t *wfilename)
 537{
 538        int n = wcslen(wfilename);
 539
 540        while (n > 0) {
 541                wchar_t c = wfilename[--n];
 542                DWORD attributes;
 543
 544                if (!is_dir_sep(c))
 545                        continue;
 546
 547                wfilename[n] = L'\0';
 548                attributes = GetFileAttributesW(wfilename);
 549                wfilename[n] = c;
 550                if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 551                                attributes == FILE_ATTRIBUTE_DEVICE)
 552                        return 1;
 553                if (attributes == INVALID_FILE_ATTRIBUTES)
 554                        switch (GetLastError()) {
 555                        case ERROR_PATH_NOT_FOUND:
 556                                continue;
 557                        case ERROR_FILE_NOT_FOUND:
 558                                /* This implies parent directory exists. */
 559                                return 1;
 560                        }
 561                return 0;
 562        }
 563        return 1;
 564}
 565
 566/* We keep the do_lstat code in a separate function to avoid recursion.
 567 * When a path ends with a slash, the stat will fail with ENOENT. In
 568 * this case, we strip the trailing slashes and stat again.
 569 *
 570 * If follow is true then act like stat() and report on the link
 571 * target. Otherwise report on the link itself.
 572 */
 573static int do_lstat(int follow, const char *file_name, struct stat *buf)
 574{
 575        WIN32_FILE_ATTRIBUTE_DATA fdata;
 576        wchar_t wfilename[MAX_PATH];
 577        if (xutftowcs_path(wfilename, file_name) < 0)
 578                return -1;
 579
 580        if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 581                buf->st_ino = 0;
 582                buf->st_gid = 0;
 583                buf->st_uid = 0;
 584                buf->st_nlink = 1;
 585                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 586                buf->st_size = fdata.nFileSizeLow |
 587                        (((off_t)fdata.nFileSizeHigh)<<32);
 588                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 589                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 590                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 591                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 592                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 593                        WIN32_FIND_DATAW findbuf;
 594                        HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 595                        if (handle != INVALID_HANDLE_VALUE) {
 596                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 597                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 598                                        if (follow) {
 599                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 600                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 601                                        } else {
 602                                                buf->st_mode = S_IFLNK;
 603                                        }
 604                                        buf->st_mode |= S_IREAD;
 605                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 606                                                buf->st_mode |= S_IWRITE;
 607                                }
 608                                FindClose(handle);
 609                        }
 610                }
 611                return 0;
 612        }
 613        switch (GetLastError()) {
 614        case ERROR_ACCESS_DENIED:
 615        case ERROR_SHARING_VIOLATION:
 616        case ERROR_LOCK_VIOLATION:
 617        case ERROR_SHARING_BUFFER_EXCEEDED:
 618                errno = EACCES;
 619                break;
 620        case ERROR_BUFFER_OVERFLOW:
 621                errno = ENAMETOOLONG;
 622                break;
 623        case ERROR_NOT_ENOUGH_MEMORY:
 624                errno = ENOMEM;
 625                break;
 626        case ERROR_PATH_NOT_FOUND:
 627                if (!has_valid_directory_prefix(wfilename)) {
 628                        errno = ENOTDIR;
 629                        break;
 630                }
 631                /* fallthru */
 632        default:
 633                errno = ENOENT;
 634                break;
 635        }
 636        return -1;
 637}
 638
 639/* We provide our own lstat/fstat functions, since the provided
 640 * lstat/fstat functions are so slow. These stat functions are
 641 * tailored for Git's usage (read: fast), and are not meant to be
 642 * complete. Note that Git stat()s are redirected to mingw_lstat()
 643 * too, since Windows doesn't really handle symlinks that well.
 644 */
 645static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 646{
 647        int namelen;
 648        char alt_name[PATH_MAX];
 649
 650        if (!do_lstat(follow, file_name, buf))
 651                return 0;
 652
 653        /* if file_name ended in a '/', Windows returned ENOENT;
 654         * try again without trailing slashes
 655         */
 656        if (errno != ENOENT)
 657                return -1;
 658
 659        namelen = strlen(file_name);
 660        if (namelen && file_name[namelen-1] != '/')
 661                return -1;
 662        while (namelen && file_name[namelen-1] == '/')
 663                --namelen;
 664        if (!namelen || namelen >= PATH_MAX)
 665                return -1;
 666
 667        memcpy(alt_name, file_name, namelen);
 668        alt_name[namelen] = 0;
 669        return do_lstat(follow, alt_name, buf);
 670}
 671
 672int mingw_lstat(const char *file_name, struct stat *buf)
 673{
 674        return do_stat_internal(0, file_name, buf);
 675}
 676int mingw_stat(const char *file_name, struct stat *buf)
 677{
 678        return do_stat_internal(1, file_name, buf);
 679}
 680
 681int mingw_fstat(int fd, struct stat *buf)
 682{
 683        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 684        BY_HANDLE_FILE_INFORMATION fdata;
 685
 686        if (fh == INVALID_HANDLE_VALUE) {
 687                errno = EBADF;
 688                return -1;
 689        }
 690        /* direct non-file handles to MS's fstat() */
 691        if (GetFileType(fh) != FILE_TYPE_DISK)
 692                return _fstati64(fd, buf);
 693
 694        if (GetFileInformationByHandle(fh, &fdata)) {
 695                buf->st_ino = 0;
 696                buf->st_gid = 0;
 697                buf->st_uid = 0;
 698                buf->st_nlink = 1;
 699                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 700                buf->st_size = fdata.nFileSizeLow |
 701                        (((off_t)fdata.nFileSizeHigh)<<32);
 702                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 703                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 704                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 705                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 706                return 0;
 707        }
 708        errno = EBADF;
 709        return -1;
 710}
 711
 712static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 713{
 714        long long winTime = t * 10000000LL + 116444736000000000LL;
 715        ft->dwLowDateTime = winTime;
 716        ft->dwHighDateTime = winTime >> 32;
 717}
 718
 719int mingw_utime (const char *file_name, const struct utimbuf *times)
 720{
 721        FILETIME mft, aft;
 722        int fh, rc;
 723        DWORD attrs;
 724        wchar_t wfilename[MAX_PATH];
 725        if (xutftowcs_path(wfilename, file_name) < 0)
 726                return -1;
 727
 728        /* must have write permission */
 729        attrs = GetFileAttributesW(wfilename);
 730        if (attrs != INVALID_FILE_ATTRIBUTES &&
 731            (attrs & FILE_ATTRIBUTE_READONLY)) {
 732                /* ignore errors here; open() will report them */
 733                SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 734        }
 735
 736        if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 737                rc = -1;
 738                goto revert_attrs;
 739        }
 740
 741        if (times) {
 742                time_t_to_filetime(times->modtime, &mft);
 743                time_t_to_filetime(times->actime, &aft);
 744        } else {
 745                GetSystemTimeAsFileTime(&mft);
 746                aft = mft;
 747        }
 748        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 749                errno = EINVAL;
 750                rc = -1;
 751        } else
 752                rc = 0;
 753        close(fh);
 754
 755revert_attrs:
 756        if (attrs != INVALID_FILE_ATTRIBUTES &&
 757            (attrs & FILE_ATTRIBUTE_READONLY)) {
 758                /* ignore errors again */
 759                SetFileAttributesW(wfilename, attrs);
 760        }
 761        return rc;
 762}
 763
 764unsigned int sleep (unsigned int seconds)
 765{
 766        Sleep(seconds*1000);
 767        return 0;
 768}
 769
 770char *mingw_mktemp(char *template)
 771{
 772        wchar_t wtemplate[MAX_PATH];
 773        if (xutftowcs_path(wtemplate, template) < 0)
 774                return NULL;
 775        if (!_wmktemp(wtemplate))
 776                return NULL;
 777        if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 778                return NULL;
 779        return template;
 780}
 781
 782int mkstemp(char *template)
 783{
 784        char *filename = mktemp(template);
 785        if (filename == NULL)
 786                return -1;
 787        return open(filename, O_RDWR | O_CREAT, 0600);
 788}
 789
 790int gettimeofday(struct timeval *tv, void *tz)
 791{
 792        FILETIME ft;
 793        long long hnsec;
 794
 795        GetSystemTimeAsFileTime(&ft);
 796        hnsec = filetime_to_hnsec(&ft);
 797        tv->tv_sec = hnsec / 10000000;
 798        tv->tv_usec = (hnsec % 10000000) / 10;
 799        return 0;
 800}
 801
 802int pipe(int filedes[2])
 803{
 804        HANDLE h[2];
 805
 806        /* this creates non-inheritable handles */
 807        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 808                errno = err_win_to_posix(GetLastError());
 809                return -1;
 810        }
 811        filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 812        if (filedes[0] < 0) {
 813                CloseHandle(h[0]);
 814                CloseHandle(h[1]);
 815                return -1;
 816        }
 817        filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 818        if (filedes[1] < 0) {
 819                close(filedes[0]);
 820                CloseHandle(h[1]);
 821                return -1;
 822        }
 823        return 0;
 824}
 825
 826struct tm *gmtime_r(const time_t *timep, struct tm *result)
 827{
 828        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 829        memcpy(result, gmtime(timep), sizeof(struct tm));
 830        return result;
 831}
 832
 833struct tm *localtime_r(const time_t *timep, struct tm *result)
 834{
 835        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 836        memcpy(result, localtime(timep), sizeof(struct tm));
 837        return result;
 838}
 839
 840char *mingw_getcwd(char *pointer, int len)
 841{
 842        wchar_t wpointer[MAX_PATH];
 843        if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 844                return NULL;
 845        if (xwcstoutf(pointer, wpointer, len) < 0)
 846                return NULL;
 847        convert_slashes(pointer);
 848        return pointer;
 849}
 850
 851/*
 852 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 853 * (Parsing C++ Command-Line Arguments)
 854 */
 855static const char *quote_arg(const char *arg)
 856{
 857        /* count chars to quote */
 858        int len = 0, n = 0;
 859        int force_quotes = 0;
 860        char *q, *d;
 861        const char *p = arg;
 862        if (!*p) force_quotes = 1;
 863        while (*p) {
 864                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 865                        force_quotes = 1;
 866                else if (*p == '"')
 867                        n++;
 868                else if (*p == '\\') {
 869                        int count = 0;
 870                        while (*p == '\\') {
 871                                count++;
 872                                p++;
 873                                len++;
 874                        }
 875                        if (*p == '"')
 876                                n += count*2 + 1;
 877                        continue;
 878                }
 879                len++;
 880                p++;
 881        }
 882        if (!force_quotes && n == 0)
 883                return arg;
 884
 885        /* insert \ where necessary */
 886        d = q = xmalloc(st_add3(len, n, 3));
 887        *d++ = '"';
 888        while (*arg) {
 889                if (*arg == '"')
 890                        *d++ = '\\';
 891                else if (*arg == '\\') {
 892                        int count = 0;
 893                        while (*arg == '\\') {
 894                                count++;
 895                                *d++ = *arg++;
 896                        }
 897                        if (*arg == '"') {
 898                                while (count-- > 0)
 899                                        *d++ = '\\';
 900                                *d++ = '\\';
 901                        }
 902                }
 903                *d++ = *arg++;
 904        }
 905        *d++ = '"';
 906        *d++ = 0;
 907        return q;
 908}
 909
 910static const char *parse_interpreter(const char *cmd)
 911{
 912        static char buf[100];
 913        char *p, *opt;
 914        int n, fd;
 915
 916        /* don't even try a .exe */
 917        n = strlen(cmd);
 918        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 919                return NULL;
 920
 921        fd = open(cmd, O_RDONLY);
 922        if (fd < 0)
 923                return NULL;
 924        n = read(fd, buf, sizeof(buf)-1);
 925        close(fd);
 926        if (n < 4)      /* at least '#!/x' and not error */
 927                return NULL;
 928
 929        if (buf[0] != '#' || buf[1] != '!')
 930                return NULL;
 931        buf[n] = '\0';
 932        p = buf + strcspn(buf, "\r\n");
 933        if (!*p)
 934                return NULL;
 935
 936        *p = '\0';
 937        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 938                return NULL;
 939        /* strip options */
 940        if ((opt = strchr(p+1, ' ')))
 941                *opt = '\0';
 942        return p+1;
 943}
 944
 945/*
 946 * exe_only means that we only want to detect .exe files, but not scripts
 947 * (which do not have an extension)
 948 */
 949static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
 950                         int isexe, int exe_only)
 951{
 952        char path[MAX_PATH];
 953        snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
 954
 955        if (!isexe && access(path, F_OK) == 0)
 956                return xstrdup(path);
 957        path[strlen(path)-4] = '\0';
 958        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 959                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 960                        return xstrdup(path);
 961        return NULL;
 962}
 963
 964/*
 965 * Determines the absolute path of cmd using the split path in path.
 966 * If cmd contains a slash or backslash, no lookup is performed.
 967 */
 968static char *path_lookup(const char *cmd, int exe_only)
 969{
 970        const char *path;
 971        char *prog = NULL;
 972        int len = strlen(cmd);
 973        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 974
 975        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 976                return xstrdup(cmd);
 977
 978        path = mingw_getenv("PATH");
 979        if (!path)
 980                return NULL;
 981
 982        while (!prog) {
 983                const char *sep = strchrnul(path, ';');
 984                int dirlen = sep - path;
 985                if (dirlen)
 986                        prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
 987                if (!*sep)
 988                        break;
 989                path = sep + 1;
 990        }
 991
 992        return prog;
 993}
 994
 995static int do_putenv(char **env, const char *name, int size, int free_old);
 996
 997/* used number of elements of environ array, including terminating NULL */
 998static int environ_size = 0;
 999/* allocated size of environ array, in bytes */
1000static int environ_alloc = 0;
1001
1002/*
1003 * Create environment block suitable for CreateProcess. Merges current
1004 * process environment and the supplied environment changes.
1005 */
1006static wchar_t *make_environment_block(char **deltaenv)
1007{
1008        wchar_t *wenvblk = NULL;
1009        char **tmpenv;
1010        int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1011
1012        while (deltaenv && deltaenv[i])
1013                i++;
1014
1015        /* copy the environment, leaving space for changes */
1016        ALLOC_ARRAY(tmpenv, size + i);
1017        memcpy(tmpenv, environ, size * sizeof(char*));
1018
1019        /* merge supplied environment changes into the temporary environment */
1020        for (i = 0; deltaenv && deltaenv[i]; i++)
1021                size = do_putenv(tmpenv, deltaenv[i], size, 0);
1022
1023        /* create environment block from temporary environment */
1024        for (i = 0; tmpenv[i]; i++) {
1025                size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1026                ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1027                wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1028        }
1029        /* add final \0 terminator */
1030        wenvblk[wenvpos] = 0;
1031        free(tmpenv);
1032        return wenvblk;
1033}
1034
1035struct pinfo_t {
1036        struct pinfo_t *next;
1037        pid_t pid;
1038        HANDLE proc;
1039};
1040static struct pinfo_t *pinfo = NULL;
1041CRITICAL_SECTION pinfo_cs;
1042
1043static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1044                              const char *dir,
1045                              int prepend_cmd, int fhin, int fhout, int fherr)
1046{
1047        STARTUPINFOW si;
1048        PROCESS_INFORMATION pi;
1049        struct strbuf args;
1050        wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1051        unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1052        BOOL ret;
1053
1054        /* Determine whether or not we are associated to a console */
1055        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1056                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1057                        FILE_ATTRIBUTE_NORMAL, NULL);
1058        if (cons == INVALID_HANDLE_VALUE) {
1059                /* There is no console associated with this process.
1060                 * Since the child is a console process, Windows
1061                 * would normally create a console window. But
1062                 * since we'll be redirecting std streams, we do
1063                 * not need the console.
1064                 * It is necessary to use DETACHED_PROCESS
1065                 * instead of CREATE_NO_WINDOW to make ssh
1066                 * recognize that it has no console.
1067                 */
1068                flags |= DETACHED_PROCESS;
1069        } else {
1070                /* There is already a console. If we specified
1071                 * DETACHED_PROCESS here, too, Windows would
1072                 * disassociate the child from the console.
1073                 * The same is true for CREATE_NO_WINDOW.
1074                 * Go figure!
1075                 */
1076                CloseHandle(cons);
1077        }
1078        memset(&si, 0, sizeof(si));
1079        si.cb = sizeof(si);
1080        si.dwFlags = STARTF_USESTDHANDLES;
1081        si.hStdInput = winansi_get_osfhandle(fhin);
1082        si.hStdOutput = winansi_get_osfhandle(fhout);
1083        si.hStdError = winansi_get_osfhandle(fherr);
1084
1085        if (xutftowcs_path(wcmd, cmd) < 0)
1086                return -1;
1087        if (dir && xutftowcs_path(wdir, dir) < 0)
1088                return -1;
1089
1090        /* concatenate argv, quoting args as we go */
1091        strbuf_init(&args, 0);
1092        if (prepend_cmd) {
1093                char *quoted = (char *)quote_arg(cmd);
1094                strbuf_addstr(&args, quoted);
1095                if (quoted != cmd)
1096                        free(quoted);
1097        }
1098        for (; *argv; argv++) {
1099                char *quoted = (char *)quote_arg(*argv);
1100                if (*args.buf)
1101                        strbuf_addch(&args, ' ');
1102                strbuf_addstr(&args, quoted);
1103                if (quoted != *argv)
1104                        free(quoted);
1105        }
1106
1107        ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1108        xutftowcs(wargs, args.buf, 2 * args.len + 1);
1109        strbuf_release(&args);
1110
1111        wenvblk = make_environment_block(deltaenv);
1112
1113        memset(&pi, 0, sizeof(pi));
1114        ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1115                wenvblk, dir ? wdir : NULL, &si, &pi);
1116
1117        free(wenvblk);
1118        free(wargs);
1119
1120        if (!ret) {
1121                errno = ENOENT;
1122                return -1;
1123        }
1124        CloseHandle(pi.hThread);
1125
1126        /*
1127         * The process ID is the human-readable identifier of the process
1128         * that we want to present in log and error messages. The handle
1129         * is not useful for this purpose. But we cannot close it, either,
1130         * because it is not possible to turn a process ID into a process
1131         * handle after the process terminated.
1132         * Keep the handle in a list for waitpid.
1133         */
1134        EnterCriticalSection(&pinfo_cs);
1135        {
1136                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1137                info->pid = pi.dwProcessId;
1138                info->proc = pi.hProcess;
1139                info->next = pinfo;
1140                pinfo = info;
1141        }
1142        LeaveCriticalSection(&pinfo_cs);
1143
1144        return (pid_t)pi.dwProcessId;
1145}
1146
1147static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1148{
1149        return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1150}
1151
1152pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1153                     const char *dir,
1154                     int fhin, int fhout, int fherr)
1155{
1156        pid_t pid;
1157        char *prog = path_lookup(cmd, 0);
1158
1159        if (!prog) {
1160                errno = ENOENT;
1161                pid = -1;
1162        }
1163        else {
1164                const char *interpr = parse_interpreter(prog);
1165
1166                if (interpr) {
1167                        const char *argv0 = argv[0];
1168                        char *iprog = path_lookup(interpr, 1);
1169                        argv[0] = prog;
1170                        if (!iprog) {
1171                                errno = ENOENT;
1172                                pid = -1;
1173                        }
1174                        else {
1175                                pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1176                                                       fhin, fhout, fherr);
1177                                free(iprog);
1178                        }
1179                        argv[0] = argv0;
1180                }
1181                else
1182                        pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1183                                               fhin, fhout, fherr);
1184                free(prog);
1185        }
1186        return pid;
1187}
1188
1189static int try_shell_exec(const char *cmd, char *const *argv)
1190{
1191        const char *interpr = parse_interpreter(cmd);
1192        char *prog;
1193        int pid = 0;
1194
1195        if (!interpr)
1196                return 0;
1197        prog = path_lookup(interpr, 1);
1198        if (prog) {
1199                int argc = 0;
1200                const char **argv2;
1201                while (argv[argc]) argc++;
1202                ALLOC_ARRAY(argv2, argc + 1);
1203                argv2[0] = (char *)cmd; /* full path to the script file */
1204                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1205                pid = mingw_spawnv(prog, argv2, 1);
1206                if (pid >= 0) {
1207                        int status;
1208                        if (waitpid(pid, &status, 0) < 0)
1209                                status = 255;
1210                        exit(status);
1211                }
1212                pid = 1;        /* indicate that we tried but failed */
1213                free(prog);
1214                free(argv2);
1215        }
1216        return pid;
1217}
1218
1219int mingw_execv(const char *cmd, char *const *argv)
1220{
1221        /* check if git_command is a shell script */
1222        if (!try_shell_exec(cmd, argv)) {
1223                int pid, status;
1224
1225                pid = mingw_spawnv(cmd, (const char **)argv, 0);
1226                if (pid < 0)
1227                        return -1;
1228                if (waitpid(pid, &status, 0) < 0)
1229                        status = 255;
1230                exit(status);
1231        }
1232        return -1;
1233}
1234
1235int mingw_execvp(const char *cmd, char *const *argv)
1236{
1237        char *prog = path_lookup(cmd, 0);
1238
1239        if (prog) {
1240                mingw_execv(prog, argv);
1241                free(prog);
1242        } else
1243                errno = ENOENT;
1244
1245        return -1;
1246}
1247
1248int mingw_kill(pid_t pid, int sig)
1249{
1250        if (pid > 0 && sig == SIGTERM) {
1251                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1252
1253                if (TerminateProcess(h, -1)) {
1254                        CloseHandle(h);
1255                        return 0;
1256                }
1257
1258                errno = err_win_to_posix(GetLastError());
1259                CloseHandle(h);
1260                return -1;
1261        } else if (pid > 0 && sig == 0) {
1262                HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1263                if (h) {
1264                        CloseHandle(h);
1265                        return 0;
1266                }
1267        }
1268
1269        errno = EINVAL;
1270        return -1;
1271}
1272
1273/*
1274 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1275 */
1276static int compareenv(const void *v1, const void *v2)
1277{
1278        const char *e1 = *(const char**)v1;
1279        const char *e2 = *(const char**)v2;
1280
1281        for (;;) {
1282                int c1 = *e1++;
1283                int c2 = *e2++;
1284                c1 = (c1 == '=') ? 0 : tolower(c1);
1285                c2 = (c2 == '=') ? 0 : tolower(c2);
1286                if (c1 > c2)
1287                        return 1;
1288                if (c1 < c2)
1289                        return -1;
1290                if (c1 == 0)
1291                        return 0;
1292        }
1293}
1294
1295static int bsearchenv(char **env, const char *name, size_t size)
1296{
1297        unsigned low = 0, high = size;
1298        while (low < high) {
1299                unsigned mid = low + ((high - low) >> 1);
1300                int cmp = compareenv(&env[mid], &name);
1301                if (cmp < 0)
1302                        low = mid + 1;
1303                else if (cmp > 0)
1304                        high = mid;
1305                else
1306                        return mid;
1307        }
1308        return ~low; /* not found, return 1's complement of insert position */
1309}
1310
1311/*
1312 * If name contains '=', then sets the variable, otherwise it unsets it
1313 * Size includes the terminating NULL. Env must have room for size + 1 entries
1314 * (in case of insert). Returns the new size. Optionally frees removed entries.
1315 */
1316static int do_putenv(char **env, const char *name, int size, int free_old)
1317{
1318        int i = bsearchenv(env, name, size - 1);
1319
1320        /* optionally free removed / replaced entry */
1321        if (i >= 0 && free_old)
1322                free(env[i]);
1323
1324        if (strchr(name, '=')) {
1325                /* if new value ('key=value') is specified, insert or replace entry */
1326                if (i < 0) {
1327                        i = ~i;
1328                        memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1329                        size++;
1330                }
1331                env[i] = (char*) name;
1332        } else if (i >= 0) {
1333                /* otherwise ('key') remove existing entry */
1334                size--;
1335                memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1336        }
1337        return size;
1338}
1339
1340char *mingw_getenv(const char *name)
1341{
1342        char *value;
1343        int pos = bsearchenv(environ, name, environ_size - 1);
1344        if (pos < 0)
1345                return NULL;
1346        value = strchr(environ[pos], '=');
1347        return value ? &value[1] : NULL;
1348}
1349
1350int mingw_putenv(const char *namevalue)
1351{
1352        ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1353        environ_size = do_putenv(environ, namevalue, environ_size, 1);
1354        return 0;
1355}
1356
1357/*
1358 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1359 * that service contains a numerical port, or that it is null. It
1360 * does a simple search using gethostbyname, and returns one IPv4 host
1361 * if one was found.
1362 */
1363static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1364                                   const struct addrinfo *hints,
1365                                   struct addrinfo **res)
1366{
1367        struct hostent *h = NULL;
1368        struct addrinfo *ai;
1369        struct sockaddr_in *sin;
1370
1371        if (node) {
1372                h = gethostbyname(node);
1373                if (!h)
1374                        return WSAGetLastError();
1375        }
1376
1377        ai = xmalloc(sizeof(struct addrinfo));
1378        *res = ai;
1379        ai->ai_flags = 0;
1380        ai->ai_family = AF_INET;
1381        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1382        switch (ai->ai_socktype) {
1383        case SOCK_STREAM:
1384                ai->ai_protocol = IPPROTO_TCP;
1385                break;
1386        case SOCK_DGRAM:
1387                ai->ai_protocol = IPPROTO_UDP;
1388                break;
1389        default:
1390                ai->ai_protocol = 0;
1391                break;
1392        }
1393        ai->ai_addrlen = sizeof(struct sockaddr_in);
1394        if (hints && (hints->ai_flags & AI_CANONNAME))
1395                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1396        else
1397                ai->ai_canonname = NULL;
1398
1399        sin = xcalloc(1, ai->ai_addrlen);
1400        sin->sin_family = AF_INET;
1401        /* Note: getaddrinfo is supposed to allow service to be a string,
1402         * which should be looked up using getservbyname. This is
1403         * currently not implemented */
1404        if (service)
1405                sin->sin_port = htons(atoi(service));
1406        if (h)
1407                sin->sin_addr = *(struct in_addr *)h->h_addr;
1408        else if (hints && (hints->ai_flags & AI_PASSIVE))
1409                sin->sin_addr.s_addr = INADDR_ANY;
1410        else
1411                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1412        ai->ai_addr = (struct sockaddr *)sin;
1413        ai->ai_next = NULL;
1414        return 0;
1415}
1416
1417static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1418{
1419        free(res->ai_canonname);
1420        free(res->ai_addr);
1421        free(res);
1422}
1423
1424static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1425                                   char *host, DWORD hostlen,
1426                                   char *serv, DWORD servlen, int flags)
1427{
1428        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1429        if (sa->sa_family != AF_INET)
1430                return EAI_FAMILY;
1431        if (!host && !serv)
1432                return EAI_NONAME;
1433
1434        if (host && hostlen > 0) {
1435                struct hostent *ent = NULL;
1436                if (!(flags & NI_NUMERICHOST))
1437                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1438                                            sizeof(sin->sin_addr), AF_INET);
1439
1440                if (ent)
1441                        snprintf(host, hostlen, "%s", ent->h_name);
1442                else if (flags & NI_NAMEREQD)
1443                        return EAI_NONAME;
1444                else
1445                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1446        }
1447
1448        if (serv && servlen > 0) {
1449                struct servent *ent = NULL;
1450                if (!(flags & NI_NUMERICSERV))
1451                        ent = getservbyport(sin->sin_port,
1452                                            flags & NI_DGRAM ? "udp" : "tcp");
1453
1454                if (ent)
1455                        snprintf(serv, servlen, "%s", ent->s_name);
1456                else
1457                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1458        }
1459
1460        return 0;
1461}
1462
1463static HMODULE ipv6_dll = NULL;
1464static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1465static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1466                                      const struct addrinfo *hints,
1467                                      struct addrinfo **res);
1468static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1469                                      char *host, DWORD hostlen,
1470                                      char *serv, DWORD servlen, int flags);
1471/*
1472 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1473 * don't need to try to load that one dynamically.
1474 */
1475
1476static void socket_cleanup(void)
1477{
1478        WSACleanup();
1479        if (ipv6_dll)
1480                FreeLibrary(ipv6_dll);
1481        ipv6_dll = NULL;
1482        ipv6_freeaddrinfo = freeaddrinfo_stub;
1483        ipv6_getaddrinfo = getaddrinfo_stub;
1484        ipv6_getnameinfo = getnameinfo_stub;
1485}
1486
1487static void ensure_socket_initialization(void)
1488{
1489        WSADATA wsa;
1490        static int initialized = 0;
1491        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1492        const char **name;
1493
1494        if (initialized)
1495                return;
1496
1497        if (WSAStartup(MAKEWORD(2,2), &wsa))
1498                die("unable to initialize winsock subsystem, error %d",
1499                        WSAGetLastError());
1500
1501        for (name = libraries; *name; name++) {
1502                ipv6_dll = LoadLibrary(*name);
1503                if (!ipv6_dll)
1504                        continue;
1505
1506                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1507                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1508                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1509                                                   const struct addrinfo *,
1510                                                   struct addrinfo **))
1511                        GetProcAddress(ipv6_dll, "getaddrinfo");
1512                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1513                                                   socklen_t, char *, DWORD,
1514                                                   char *, DWORD, int))
1515                        GetProcAddress(ipv6_dll, "getnameinfo");
1516                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1517                        FreeLibrary(ipv6_dll);
1518                        ipv6_dll = NULL;
1519                } else
1520                        break;
1521        }
1522        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1523                ipv6_freeaddrinfo = freeaddrinfo_stub;
1524                ipv6_getaddrinfo = getaddrinfo_stub;
1525                ipv6_getnameinfo = getnameinfo_stub;
1526        }
1527
1528        atexit(socket_cleanup);
1529        initialized = 1;
1530}
1531
1532#undef gethostname
1533int mingw_gethostname(char *name, int namelen)
1534{
1535    ensure_socket_initialization();
1536    return gethostname(name, namelen);
1537}
1538
1539#undef gethostbyname
1540struct hostent *mingw_gethostbyname(const char *host)
1541{
1542        ensure_socket_initialization();
1543        return gethostbyname(host);
1544}
1545
1546void mingw_freeaddrinfo(struct addrinfo *res)
1547{
1548        ipv6_freeaddrinfo(res);
1549}
1550
1551int mingw_getaddrinfo(const char *node, const char *service,
1552                      const struct addrinfo *hints, struct addrinfo **res)
1553{
1554        ensure_socket_initialization();
1555        return ipv6_getaddrinfo(node, service, hints, res);
1556}
1557
1558int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1559                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1560                      int flags)
1561{
1562        ensure_socket_initialization();
1563        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1564}
1565
1566int mingw_socket(int domain, int type, int protocol)
1567{
1568        int sockfd;
1569        SOCKET s;
1570
1571        ensure_socket_initialization();
1572        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1573        if (s == INVALID_SOCKET) {
1574                /*
1575                 * WSAGetLastError() values are regular BSD error codes
1576                 * biased by WSABASEERR.
1577                 * However, strerror() does not know about networking
1578                 * specific errors, which are values beginning at 38 or so.
1579                 * Therefore, we choose to leave the biased error code
1580                 * in errno so that _if_ someone looks up the code somewhere,
1581                 * then it is at least the number that are usually listed.
1582                 */
1583                errno = WSAGetLastError();
1584                return -1;
1585        }
1586        /* convert into a file descriptor */
1587        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1588                closesocket(s);
1589                return error("unable to make a socket file descriptor: %s",
1590                        strerror(errno));
1591        }
1592        return sockfd;
1593}
1594
1595#undef connect
1596int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1597{
1598        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1599        return connect(s, sa, sz);
1600}
1601
1602#undef bind
1603int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1604{
1605        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1606        return bind(s, sa, sz);
1607}
1608
1609#undef setsockopt
1610int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1611{
1612        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1613        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1614}
1615
1616#undef shutdown
1617int mingw_shutdown(int sockfd, int how)
1618{
1619        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1620        return shutdown(s, how);
1621}
1622
1623#undef listen
1624int mingw_listen(int sockfd, int backlog)
1625{
1626        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1627        return listen(s, backlog);
1628}
1629
1630#undef accept
1631int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1632{
1633        int sockfd2;
1634
1635        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1636        SOCKET s2 = accept(s1, sa, sz);
1637
1638        /* convert into a file descriptor */
1639        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1640                int err = errno;
1641                closesocket(s2);
1642                return error("unable to make a socket file descriptor: %s",
1643                        strerror(err));
1644        }
1645        return sockfd2;
1646}
1647
1648#undef rename
1649int mingw_rename(const char *pold, const char *pnew)
1650{
1651        DWORD attrs, gle;
1652        int tries = 0;
1653        wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1654        if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1655                return -1;
1656
1657        /*
1658         * Try native rename() first to get errno right.
1659         * It is based on MoveFile(), which cannot overwrite existing files.
1660         */
1661        if (!_wrename(wpold, wpnew))
1662                return 0;
1663        if (errno != EEXIST)
1664                return -1;
1665repeat:
1666        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1667                return 0;
1668        /* TODO: translate more errors */
1669        gle = GetLastError();
1670        if (gle == ERROR_ACCESS_DENIED &&
1671            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1672                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1673                        DWORD attrsold = GetFileAttributesW(wpold);
1674                        if (attrsold == INVALID_FILE_ATTRIBUTES ||
1675                            !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1676                                errno = EISDIR;
1677                        else if (!_wrmdir(wpnew))
1678                                goto repeat;
1679                        return -1;
1680                }
1681                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1682                    SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1683                        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1684                                return 0;
1685                        gle = GetLastError();
1686                        /* revert file attributes on failure */
1687                        SetFileAttributesW(wpnew, attrs);
1688                }
1689        }
1690        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1691                /*
1692                 * We assume that some other process had the source or
1693                 * destination file open at the wrong moment and retry.
1694                 * In order to give the other process a higher chance to
1695                 * complete its operation, we give up our time slice now.
1696                 * If we have to retry again, we do sleep a bit.
1697                 */
1698                Sleep(delay[tries]);
1699                tries++;
1700                goto repeat;
1701        }
1702        if (gle == ERROR_ACCESS_DENIED &&
1703               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1704                       "Should I try again?", pold, pnew))
1705                goto repeat;
1706
1707        errno = EACCES;
1708        return -1;
1709}
1710
1711/*
1712 * Note that this doesn't return the actual pagesize, but
1713 * the allocation granularity. If future Windows specific git code
1714 * needs the real getpagesize function, we need to find another solution.
1715 */
1716int mingw_getpagesize(void)
1717{
1718        SYSTEM_INFO si;
1719        GetSystemInfo(&si);
1720        return si.dwAllocationGranularity;
1721}
1722
1723struct passwd *getpwuid(int uid)
1724{
1725        static char user_name[100];
1726        static struct passwd p;
1727
1728        DWORD len = sizeof(user_name);
1729        if (!GetUserName(user_name, &len))
1730                return NULL;
1731        p.pw_name = user_name;
1732        p.pw_gecos = "unknown";
1733        p.pw_dir = NULL;
1734        return &p;
1735}
1736
1737static HANDLE timer_event;
1738static HANDLE timer_thread;
1739static int timer_interval;
1740static int one_shot;
1741static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1742
1743/* The timer works like this:
1744 * The thread, ticktack(), is a trivial routine that most of the time
1745 * only waits to receive the signal to terminate. The main thread tells
1746 * the thread to terminate by setting the timer_event to the signalled
1747 * state.
1748 * But ticktack() interrupts the wait state after the timer's interval
1749 * length to call the signal handler.
1750 */
1751
1752static unsigned __stdcall ticktack(void *dummy)
1753{
1754        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1755                mingw_raise(SIGALRM);
1756                if (one_shot)
1757                        break;
1758        }
1759        return 0;
1760}
1761
1762static int start_timer_thread(void)
1763{
1764        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1765        if (timer_event) {
1766                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1767                if (!timer_thread )
1768                        return errno = ENOMEM,
1769                                error("cannot start timer thread");
1770        } else
1771                return errno = ENOMEM,
1772                        error("cannot allocate resources for timer");
1773        return 0;
1774}
1775
1776static void stop_timer_thread(void)
1777{
1778        if (timer_event)
1779                SetEvent(timer_event);  /* tell thread to terminate */
1780        if (timer_thread) {
1781                int rc = WaitForSingleObject(timer_thread, 1000);
1782                if (rc == WAIT_TIMEOUT)
1783                        error("timer thread did not terminate timely");
1784                else if (rc != WAIT_OBJECT_0)
1785                        error("waiting for timer thread failed: %lu",
1786                              GetLastError());
1787                CloseHandle(timer_thread);
1788        }
1789        if (timer_event)
1790                CloseHandle(timer_event);
1791        timer_event = NULL;
1792        timer_thread = NULL;
1793}
1794
1795static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1796{
1797        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1798}
1799
1800int setitimer(int type, struct itimerval *in, struct itimerval *out)
1801{
1802        static const struct timeval zero;
1803        static int atexit_done;
1804
1805        if (out != NULL)
1806                return errno = EINVAL,
1807                        error("setitimer param 3 != NULL not implemented");
1808        if (!is_timeval_eq(&in->it_interval, &zero) &&
1809            !is_timeval_eq(&in->it_interval, &in->it_value))
1810                return errno = EINVAL,
1811                        error("setitimer: it_interval must be zero or eq it_value");
1812
1813        if (timer_thread)
1814                stop_timer_thread();
1815
1816        if (is_timeval_eq(&in->it_value, &zero) &&
1817            is_timeval_eq(&in->it_interval, &zero))
1818                return 0;
1819
1820        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1821        one_shot = is_timeval_eq(&in->it_interval, &zero);
1822        if (!atexit_done) {
1823                atexit(stop_timer_thread);
1824                atexit_done = 1;
1825        }
1826        return start_timer_thread();
1827}
1828
1829int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1830{
1831        if (sig != SIGALRM)
1832                return errno = EINVAL,
1833                        error("sigaction only implemented for SIGALRM");
1834        if (out != NULL)
1835                return errno = EINVAL,
1836                        error("sigaction: param 3 != NULL not implemented");
1837
1838        timer_fn = in->sa_handler;
1839        return 0;
1840}
1841
1842#undef signal
1843sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1844{
1845        sig_handler_t old;
1846
1847        switch (sig) {
1848        case SIGALRM:
1849                old = timer_fn;
1850                timer_fn = handler;
1851                break;
1852
1853        case SIGINT:
1854                old = sigint_fn;
1855                sigint_fn = handler;
1856                break;
1857
1858        default:
1859                return signal(sig, handler);
1860        }
1861
1862        return old;
1863}
1864
1865#undef raise
1866int mingw_raise(int sig)
1867{
1868        switch (sig) {
1869        case SIGALRM:
1870                if (timer_fn == SIG_DFL) {
1871                        if (isatty(STDERR_FILENO))
1872                                fputs("Alarm clock\n", stderr);
1873                        exit(128 + SIGALRM);
1874                } else if (timer_fn != SIG_IGN)
1875                        timer_fn(SIGALRM);
1876                return 0;
1877
1878        case SIGINT:
1879                if (sigint_fn == SIG_DFL)
1880                        exit(128 + SIGINT);
1881                else if (sigint_fn != SIG_IGN)
1882                        sigint_fn(SIGINT);
1883                return 0;
1884
1885        default:
1886                return raise(sig);
1887        }
1888}
1889
1890int link(const char *oldpath, const char *newpath)
1891{
1892        typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1893        static T create_hard_link = NULL;
1894        wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1895        if (xutftowcs_path(woldpath, oldpath) < 0 ||
1896                xutftowcs_path(wnewpath, newpath) < 0)
1897                return -1;
1898
1899        if (!create_hard_link) {
1900                create_hard_link = (T) GetProcAddress(
1901                        GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1902                if (!create_hard_link)
1903                        create_hard_link = (T)-1;
1904        }
1905        if (create_hard_link == (T)-1) {
1906                errno = ENOSYS;
1907                return -1;
1908        }
1909        if (!create_hard_link(wnewpath, woldpath, NULL)) {
1910                errno = err_win_to_posix(GetLastError());
1911                return -1;
1912        }
1913        return 0;
1914}
1915
1916pid_t waitpid(pid_t pid, int *status, int options)
1917{
1918        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1919            FALSE, pid);
1920        if (!h) {
1921                errno = ECHILD;
1922                return -1;
1923        }
1924
1925        if (pid > 0 && options & WNOHANG) {
1926                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1927                        CloseHandle(h);
1928                        return 0;
1929                }
1930                options &= ~WNOHANG;
1931        }
1932
1933        if (options == 0) {
1934                struct pinfo_t **ppinfo;
1935                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1936                        CloseHandle(h);
1937                        return 0;
1938                }
1939
1940                if (status)
1941                        GetExitCodeProcess(h, (LPDWORD)status);
1942
1943                EnterCriticalSection(&pinfo_cs);
1944
1945                ppinfo = &pinfo;
1946                while (*ppinfo) {
1947                        struct pinfo_t *info = *ppinfo;
1948                        if (info->pid == pid) {
1949                                CloseHandle(info->proc);
1950                                *ppinfo = info->next;
1951                                free(info);
1952                                break;
1953                        }
1954                        ppinfo = &info->next;
1955                }
1956
1957                LeaveCriticalSection(&pinfo_cs);
1958
1959                CloseHandle(h);
1960                return pid;
1961        }
1962        CloseHandle(h);
1963
1964        errno = EINVAL;
1965        return -1;
1966}
1967
1968int mingw_skip_dos_drive_prefix(char **path)
1969{
1970        int ret = has_dos_drive_prefix(*path);
1971        *path += ret;
1972        return ret;
1973}
1974
1975int mingw_offset_1st_component(const char *path)
1976{
1977        char *pos = (char *)path;
1978
1979        /* unc paths */
1980        if (!skip_dos_drive_prefix(&pos) &&
1981                        is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
1982                /* skip server name */
1983                pos = strpbrk(pos + 2, "\\/");
1984                if (!pos)
1985                        return 0; /* Error: malformed unc path */
1986
1987                do {
1988                        pos++;
1989                } while (*pos && !is_dir_sep(*pos));
1990        }
1991
1992        return pos + is_dir_sep(*pos) - path;
1993}
1994
1995int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
1996{
1997        int upos = 0, wpos = 0;
1998        const unsigned char *utf = (const unsigned char*) utfs;
1999        if (!utf || !wcs || wcslen < 1) {
2000                errno = EINVAL;
2001                return -1;
2002        }
2003        /* reserve space for \0 */
2004        wcslen--;
2005        if (utflen < 0)
2006                utflen = INT_MAX;
2007
2008        while (upos < utflen) {
2009                int c = utf[upos++] & 0xff;
2010                if (utflen == INT_MAX && c == 0)
2011                        break;
2012
2013                if (wpos >= wcslen) {
2014                        wcs[wpos] = 0;
2015                        errno = ERANGE;
2016                        return -1;
2017                }
2018
2019                if (c < 0x80) {
2020                        /* ASCII */
2021                        wcs[wpos++] = c;
2022                } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2023                                (utf[upos] & 0xc0) == 0x80) {
2024                        /* 2-byte utf-8 */
2025                        c = ((c & 0x1f) << 6);
2026                        c |= (utf[upos++] & 0x3f);
2027                        wcs[wpos++] = c;
2028                } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2029                                !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2030                                (utf[upos] & 0xc0) == 0x80 &&
2031                                (utf[upos + 1] & 0xc0) == 0x80) {
2032                        /* 3-byte utf-8 */
2033                        c = ((c & 0x0f) << 12);
2034                        c |= ((utf[upos++] & 0x3f) << 6);
2035                        c |= (utf[upos++] & 0x3f);
2036                        wcs[wpos++] = c;
2037                } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2038                                wpos + 1 < wcslen &&
2039                                !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2040                                !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2041                                (utf[upos] & 0xc0) == 0x80 &&
2042                                (utf[upos + 1] & 0xc0) == 0x80 &&
2043                                (utf[upos + 2] & 0xc0) == 0x80) {
2044                        /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2045                        c = ((c & 0x07) << 18);
2046                        c |= ((utf[upos++] & 0x3f) << 12);
2047                        c |= ((utf[upos++] & 0x3f) << 6);
2048                        c |= (utf[upos++] & 0x3f);
2049                        c -= 0x10000;
2050                        wcs[wpos++] = 0xd800 | (c >> 10);
2051                        wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2052                } else if (c >= 0xa0) {
2053                        /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2054                        wcs[wpos++] = c;
2055                } else {
2056                        /* invalid utf-8 byte, non-printable unicode: convert to hex */
2057                        static const char *hex = "0123456789abcdef";
2058                        wcs[wpos++] = hex[c >> 4];
2059                        if (wpos < wcslen)
2060                                wcs[wpos++] = hex[c & 0x0f];
2061                }
2062        }
2063        wcs[wpos] = 0;
2064        return wpos;
2065}
2066
2067int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2068{
2069        if (!wcs || !utf || utflen < 1) {
2070                errno = EINVAL;
2071                return -1;
2072        }
2073        utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2074        if (utflen)
2075                return utflen - 1;
2076        errno = ERANGE;
2077        return -1;
2078}
2079
2080static void setup_windows_environment(void)
2081{
2082        char *tmp = getenv("TMPDIR");
2083
2084        /* on Windows it is TMP and TEMP */
2085        if (!tmp) {
2086                if (!(tmp = getenv("TMP")))
2087                        tmp = getenv("TEMP");
2088                if (tmp) {
2089                        setenv("TMPDIR", tmp, 1);
2090                        tmp = getenv("TMPDIR");
2091                }
2092        }
2093
2094        if (tmp) {
2095                /*
2096                 * Convert all dir separators to forward slashes,
2097                 * to help shell commands called from the Git
2098                 * executable (by not mistaking the dir separators
2099                 * for escape characters).
2100                 */
2101                convert_slashes(tmp);
2102        }
2103
2104        /* simulate TERM to enable auto-color (see color.c) */
2105        if (!getenv("TERM"))
2106                setenv("TERM", "cygwin", 1);
2107}
2108
2109/*
2110 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2111 * mingw startup code, see init.c in mingw runtime).
2112 */
2113int _CRT_glob = 0;
2114
2115typedef struct {
2116        int newmode;
2117} _startupinfo;
2118
2119extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2120                _startupinfo *si);
2121
2122static NORETURN void die_startup(void)
2123{
2124        fputs("fatal: not enough memory for initialization", stderr);
2125        exit(128);
2126}
2127
2128static void *malloc_startup(size_t size)
2129{
2130        void *result = malloc(size);
2131        if (!result)
2132                die_startup();
2133        return result;
2134}
2135
2136static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2137{
2138        len = xwcstoutf(buffer, wcs, len) + 1;
2139        return memcpy(malloc_startup(len), buffer, len);
2140}
2141
2142void mingw_startup(void)
2143{
2144        int i, maxlen, argc;
2145        char *buffer;
2146        wchar_t **wenv, **wargv;
2147        _startupinfo si;
2148
2149        /* get wide char arguments and environment */
2150        si.newmode = 0;
2151        if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2152                die_startup();
2153
2154        /* determine size of argv and environ conversion buffer */
2155        maxlen = wcslen(_wpgmptr);
2156        for (i = 1; i < argc; i++)
2157                maxlen = max(maxlen, wcslen(wargv[i]));
2158        for (i = 0; wenv[i]; i++)
2159                maxlen = max(maxlen, wcslen(wenv[i]));
2160
2161        /*
2162         * nedmalloc can't free CRT memory, allocate resizable environment
2163         * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2164         * use it while initializing the environment itself.
2165         */
2166        environ_size = i + 1;
2167        environ_alloc = alloc_nr(environ_size * sizeof(char*));
2168        environ = malloc_startup(environ_alloc);
2169
2170        /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2171        maxlen = 3 * maxlen + 1;
2172        buffer = malloc_startup(maxlen);
2173
2174        /* convert command line arguments and environment to UTF-8 */
2175        __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2176        for (i = 1; i < argc; i++)
2177                __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2178        for (i = 0; wenv[i]; i++)
2179                environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2180        environ[i] = NULL;
2181        free(buffer);
2182
2183        /* sort environment for O(log n) getenv / putenv */
2184        qsort(environ, i, sizeof(char*), compareenv);
2185
2186        /* fix Windows specific environment settings */
2187        setup_windows_environment();
2188
2189        /* initialize critical section for waitpid pinfo_t list */
2190        InitializeCriticalSection(&pinfo_cs);
2191
2192        /* set up default file mode and file modes for stdin/out/err */
2193        _fmode = _O_BINARY;
2194        _setmode(_fileno(stdin), _O_BINARY);
2195        _setmode(_fileno(stdout), _O_BINARY);
2196        _setmode(_fileno(stderr), _O_BINARY);
2197
2198        /* initialize Unicode console */
2199        winansi_init();
2200}
2201
2202int uname(struct utsname *buf)
2203{
2204        unsigned v = (unsigned)GetVersion();
2205        memset(buf, 0, sizeof(*buf));
2206        xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2207        xsnprintf(buf->release, sizeof(buf->release),
2208                 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2209        /* assuming NT variants only.. */
2210        xsnprintf(buf->version, sizeof(buf->version),
2211                  "%u", (v >> 16) & 0x7fff);
2212        return 0;
2213}