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 && hide && set_hidden_flag(wfilename, 1))
 427                warning("could not mark '%s' as hidden.", filename);
 428        return file;
 429}
 430
 431FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 432{
 433        int hide = needs_hiding(filename);
 434        FILE *file;
 435        wchar_t wfilename[MAX_PATH], wotype[4];
 436        if (filename && !strcmp(filename, "/dev/null"))
 437                filename = "nul";
 438        if (xutftowcs_path(wfilename, filename) < 0 ||
 439                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 440                return NULL;
 441        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 442                error("could not unhide %s", filename);
 443                return NULL;
 444        }
 445        file = _wfreopen(wfilename, wotype, stream);
 446        if (file && hide && set_hidden_flag(wfilename, 1))
 447                warning("could not mark '%s' as hidden.", filename);
 448        return file;
 449}
 450
 451#undef fflush
 452int mingw_fflush(FILE *stream)
 453{
 454        int ret = fflush(stream);
 455
 456        /*
 457         * write() is used behind the scenes of stdio output functions.
 458         * Since git code does not check for errors after each stdio write
 459         * operation, it can happen that write() is called by a later
 460         * stdio function even if an earlier write() call failed. In the
 461         * case of a pipe whose readable end was closed, only the first
 462         * call to write() reports EPIPE on Windows. Subsequent write()
 463         * calls report EINVAL. It is impossible to notice whether this
 464         * fflush invocation triggered such a case, therefore, we have to
 465         * catch all EINVAL errors whole-sale.
 466         */
 467        if (ret && errno == EINVAL)
 468                errno = EPIPE;
 469
 470        return ret;
 471}
 472
 473#undef write
 474ssize_t mingw_write(int fd, const void *buf, size_t len)
 475{
 476        ssize_t result = write(fd, buf, len);
 477
 478        if (result < 0 && errno == EINVAL && buf) {
 479                /* check if fd is a pipe */
 480                HANDLE h = (HANDLE) _get_osfhandle(fd);
 481                if (GetFileType(h) == FILE_TYPE_PIPE)
 482                        errno = EPIPE;
 483                else
 484                        errno = EINVAL;
 485        }
 486
 487        return result;
 488}
 489
 490int mingw_access(const char *filename, int mode)
 491{
 492        wchar_t wfilename[MAX_PATH];
 493        if (xutftowcs_path(wfilename, filename) < 0)
 494                return -1;
 495        /* X_OK is not supported by the MSVCRT version */
 496        return _waccess(wfilename, mode & ~X_OK);
 497}
 498
 499int mingw_chdir(const char *dirname)
 500{
 501        wchar_t wdirname[MAX_PATH];
 502        if (xutftowcs_path(wdirname, dirname) < 0)
 503                return -1;
 504        return _wchdir(wdirname);
 505}
 506
 507int mingw_chmod(const char *filename, int mode)
 508{
 509        wchar_t wfilename[MAX_PATH];
 510        if (xutftowcs_path(wfilename, filename) < 0)
 511                return -1;
 512        return _wchmod(wfilename, mode);
 513}
 514
 515/*
 516 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 517 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 518 */
 519static inline long long filetime_to_hnsec(const FILETIME *ft)
 520{
 521        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 522        /* Windows to Unix Epoch conversion */
 523        return winTime - 116444736000000000LL;
 524}
 525
 526static inline time_t filetime_to_time_t(const FILETIME *ft)
 527{
 528        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 529}
 530
 531/**
 532 * Verifies that safe_create_leading_directories() would succeed.
 533 */
 534static int has_valid_directory_prefix(wchar_t *wfilename)
 535{
 536        int n = wcslen(wfilename);
 537
 538        while (n > 0) {
 539                wchar_t c = wfilename[--n];
 540                DWORD attributes;
 541
 542                if (!is_dir_sep(c))
 543                        continue;
 544
 545                wfilename[n] = L'\0';
 546                attributes = GetFileAttributesW(wfilename);
 547                wfilename[n] = c;
 548                if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 549                                attributes == FILE_ATTRIBUTE_DEVICE)
 550                        return 1;
 551                if (attributes == INVALID_FILE_ATTRIBUTES)
 552                        switch (GetLastError()) {
 553                        case ERROR_PATH_NOT_FOUND:
 554                                continue;
 555                        case ERROR_FILE_NOT_FOUND:
 556                                /* This implies parent directory exists. */
 557                                return 1;
 558                        }
 559                return 0;
 560        }
 561        return 1;
 562}
 563
 564/* We keep the do_lstat code in a separate function to avoid recursion.
 565 * When a path ends with a slash, the stat will fail with ENOENT. In
 566 * this case, we strip the trailing slashes and stat again.
 567 *
 568 * If follow is true then act like stat() and report on the link
 569 * target. Otherwise report on the link itself.
 570 */
 571static int do_lstat(int follow, const char *file_name, struct stat *buf)
 572{
 573        WIN32_FILE_ATTRIBUTE_DATA fdata;
 574        wchar_t wfilename[MAX_PATH];
 575        if (xutftowcs_path(wfilename, file_name) < 0)
 576                return -1;
 577
 578        if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 579                buf->st_ino = 0;
 580                buf->st_gid = 0;
 581                buf->st_uid = 0;
 582                buf->st_nlink = 1;
 583                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 584                buf->st_size = fdata.nFileSizeLow |
 585                        (((off_t)fdata.nFileSizeHigh)<<32);
 586                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 587                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 588                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 589                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 590                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 591                        WIN32_FIND_DATAW findbuf;
 592                        HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 593                        if (handle != INVALID_HANDLE_VALUE) {
 594                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 595                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 596                                        if (follow) {
 597                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 598                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 599                                        } else {
 600                                                buf->st_mode = S_IFLNK;
 601                                        }
 602                                        buf->st_mode |= S_IREAD;
 603                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 604                                                buf->st_mode |= S_IWRITE;
 605                                }
 606                                FindClose(handle);
 607                        }
 608                }
 609                return 0;
 610        }
 611        switch (GetLastError()) {
 612        case ERROR_ACCESS_DENIED:
 613        case ERROR_SHARING_VIOLATION:
 614        case ERROR_LOCK_VIOLATION:
 615        case ERROR_SHARING_BUFFER_EXCEEDED:
 616                errno = EACCES;
 617                break;
 618        case ERROR_BUFFER_OVERFLOW:
 619                errno = ENAMETOOLONG;
 620                break;
 621        case ERROR_NOT_ENOUGH_MEMORY:
 622                errno = ENOMEM;
 623                break;
 624        case ERROR_PATH_NOT_FOUND:
 625                if (!has_valid_directory_prefix(wfilename)) {
 626                        errno = ENOTDIR;
 627                        break;
 628                }
 629                /* fallthru */
 630        default:
 631                errno = ENOENT;
 632                break;
 633        }
 634        return -1;
 635}
 636
 637/* We provide our own lstat/fstat functions, since the provided
 638 * lstat/fstat functions are so slow. These stat functions are
 639 * tailored for Git's usage (read: fast), and are not meant to be
 640 * complete. Note that Git stat()s are redirected to mingw_lstat()
 641 * too, since Windows doesn't really handle symlinks that well.
 642 */
 643static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 644{
 645        int namelen;
 646        char alt_name[PATH_MAX];
 647
 648        if (!do_lstat(follow, file_name, buf))
 649                return 0;
 650
 651        /* if file_name ended in a '/', Windows returned ENOENT;
 652         * try again without trailing slashes
 653         */
 654        if (errno != ENOENT)
 655                return -1;
 656
 657        namelen = strlen(file_name);
 658        if (namelen && file_name[namelen-1] != '/')
 659                return -1;
 660        while (namelen && file_name[namelen-1] == '/')
 661                --namelen;
 662        if (!namelen || namelen >= PATH_MAX)
 663                return -1;
 664
 665        memcpy(alt_name, file_name, namelen);
 666        alt_name[namelen] = 0;
 667        return do_lstat(follow, alt_name, buf);
 668}
 669
 670int mingw_lstat(const char *file_name, struct stat *buf)
 671{
 672        return do_stat_internal(0, file_name, buf);
 673}
 674int mingw_stat(const char *file_name, struct stat *buf)
 675{
 676        return do_stat_internal(1, file_name, buf);
 677}
 678
 679int mingw_fstat(int fd, struct stat *buf)
 680{
 681        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 682        BY_HANDLE_FILE_INFORMATION fdata;
 683
 684        if (fh == INVALID_HANDLE_VALUE) {
 685                errno = EBADF;
 686                return -1;
 687        }
 688        /* direct non-file handles to MS's fstat() */
 689        if (GetFileType(fh) != FILE_TYPE_DISK)
 690                return _fstati64(fd, buf);
 691
 692        if (GetFileInformationByHandle(fh, &fdata)) {
 693                buf->st_ino = 0;
 694                buf->st_gid = 0;
 695                buf->st_uid = 0;
 696                buf->st_nlink = 1;
 697                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 698                buf->st_size = fdata.nFileSizeLow |
 699                        (((off_t)fdata.nFileSizeHigh)<<32);
 700                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 701                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 702                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 703                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 704                return 0;
 705        }
 706        errno = EBADF;
 707        return -1;
 708}
 709
 710static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 711{
 712        long long winTime = t * 10000000LL + 116444736000000000LL;
 713        ft->dwLowDateTime = winTime;
 714        ft->dwHighDateTime = winTime >> 32;
 715}
 716
 717int mingw_utime (const char *file_name, const struct utimbuf *times)
 718{
 719        FILETIME mft, aft;
 720        int fh, rc;
 721        DWORD attrs;
 722        wchar_t wfilename[MAX_PATH];
 723        if (xutftowcs_path(wfilename, file_name) < 0)
 724                return -1;
 725
 726        /* must have write permission */
 727        attrs = GetFileAttributesW(wfilename);
 728        if (attrs != INVALID_FILE_ATTRIBUTES &&
 729            (attrs & FILE_ATTRIBUTE_READONLY)) {
 730                /* ignore errors here; open() will report them */
 731                SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 732        }
 733
 734        if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 735                rc = -1;
 736                goto revert_attrs;
 737        }
 738
 739        if (times) {
 740                time_t_to_filetime(times->modtime, &mft);
 741                time_t_to_filetime(times->actime, &aft);
 742        } else {
 743                GetSystemTimeAsFileTime(&mft);
 744                aft = mft;
 745        }
 746        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 747                errno = EINVAL;
 748                rc = -1;
 749        } else
 750                rc = 0;
 751        close(fh);
 752
 753revert_attrs:
 754        if (attrs != INVALID_FILE_ATTRIBUTES &&
 755            (attrs & FILE_ATTRIBUTE_READONLY)) {
 756                /* ignore errors again */
 757                SetFileAttributesW(wfilename, attrs);
 758        }
 759        return rc;
 760}
 761
 762unsigned int sleep (unsigned int seconds)
 763{
 764        Sleep(seconds*1000);
 765        return 0;
 766}
 767
 768char *mingw_mktemp(char *template)
 769{
 770        wchar_t wtemplate[MAX_PATH];
 771        if (xutftowcs_path(wtemplate, template) < 0)
 772                return NULL;
 773        if (!_wmktemp(wtemplate))
 774                return NULL;
 775        if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 776                return NULL;
 777        return template;
 778}
 779
 780int mkstemp(char *template)
 781{
 782        char *filename = mktemp(template);
 783        if (filename == NULL)
 784                return -1;
 785        return open(filename, O_RDWR | O_CREAT, 0600);
 786}
 787
 788int gettimeofday(struct timeval *tv, void *tz)
 789{
 790        FILETIME ft;
 791        long long hnsec;
 792
 793        GetSystemTimeAsFileTime(&ft);
 794        hnsec = filetime_to_hnsec(&ft);
 795        tv->tv_sec = hnsec / 10000000;
 796        tv->tv_usec = (hnsec % 10000000) / 10;
 797        return 0;
 798}
 799
 800int pipe(int filedes[2])
 801{
 802        HANDLE h[2];
 803
 804        /* this creates non-inheritable handles */
 805        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 806                errno = err_win_to_posix(GetLastError());
 807                return -1;
 808        }
 809        filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 810        if (filedes[0] < 0) {
 811                CloseHandle(h[0]);
 812                CloseHandle(h[1]);
 813                return -1;
 814        }
 815        filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 816        if (filedes[1] < 0) {
 817                close(filedes[0]);
 818                CloseHandle(h[1]);
 819                return -1;
 820        }
 821        return 0;
 822}
 823
 824struct tm *gmtime_r(const time_t *timep, struct tm *result)
 825{
 826        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 827        memcpy(result, gmtime(timep), sizeof(struct tm));
 828        return result;
 829}
 830
 831struct tm *localtime_r(const time_t *timep, struct tm *result)
 832{
 833        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 834        memcpy(result, localtime(timep), sizeof(struct tm));
 835        return result;
 836}
 837
 838char *mingw_getcwd(char *pointer, int len)
 839{
 840        wchar_t wpointer[MAX_PATH];
 841        if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 842                return NULL;
 843        if (xwcstoutf(pointer, wpointer, len) < 0)
 844                return NULL;
 845        convert_slashes(pointer);
 846        return pointer;
 847}
 848
 849/*
 850 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 851 * (Parsing C++ Command-Line Arguments)
 852 */
 853static const char *quote_arg(const char *arg)
 854{
 855        /* count chars to quote */
 856        int len = 0, n = 0;
 857        int force_quotes = 0;
 858        char *q, *d;
 859        const char *p = arg;
 860        if (!*p) force_quotes = 1;
 861        while (*p) {
 862                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 863                        force_quotes = 1;
 864                else if (*p == '"')
 865                        n++;
 866                else if (*p == '\\') {
 867                        int count = 0;
 868                        while (*p == '\\') {
 869                                count++;
 870                                p++;
 871                                len++;
 872                        }
 873                        if (*p == '"')
 874                                n += count*2 + 1;
 875                        continue;
 876                }
 877                len++;
 878                p++;
 879        }
 880        if (!force_quotes && n == 0)
 881                return arg;
 882
 883        /* insert \ where necessary */
 884        d = q = xmalloc(st_add3(len, n, 3));
 885        *d++ = '"';
 886        while (*arg) {
 887                if (*arg == '"')
 888                        *d++ = '\\';
 889                else if (*arg == '\\') {
 890                        int count = 0;
 891                        while (*arg == '\\') {
 892                                count++;
 893                                *d++ = *arg++;
 894                        }
 895                        if (*arg == '"') {
 896                                while (count-- > 0)
 897                                        *d++ = '\\';
 898                                *d++ = '\\';
 899                        }
 900                }
 901                *d++ = *arg++;
 902        }
 903        *d++ = '"';
 904        *d++ = 0;
 905        return q;
 906}
 907
 908static const char *parse_interpreter(const char *cmd)
 909{
 910        static char buf[100];
 911        char *p, *opt;
 912        int n, fd;
 913
 914        /* don't even try a .exe */
 915        n = strlen(cmd);
 916        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 917                return NULL;
 918
 919        fd = open(cmd, O_RDONLY);
 920        if (fd < 0)
 921                return NULL;
 922        n = read(fd, buf, sizeof(buf)-1);
 923        close(fd);
 924        if (n < 4)      /* at least '#!/x' and not error */
 925                return NULL;
 926
 927        if (buf[0] != '#' || buf[1] != '!')
 928                return NULL;
 929        buf[n] = '\0';
 930        p = buf + strcspn(buf, "\r\n");
 931        if (!*p)
 932                return NULL;
 933
 934        *p = '\0';
 935        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 936                return NULL;
 937        /* strip options */
 938        if ((opt = strchr(p+1, ' ')))
 939                *opt = '\0';
 940        return p+1;
 941}
 942
 943/*
 944 * Splits the PATH into parts.
 945 */
 946static char **get_path_split(void)
 947{
 948        char *p, **path, *envpath = mingw_getenv("PATH");
 949        int i, n = 0;
 950
 951        if (!envpath || !*envpath)
 952                return NULL;
 953
 954        envpath = xstrdup(envpath);
 955        p = envpath;
 956        while (p) {
 957                char *dir = p;
 958                p = strchr(p, ';');
 959                if (p) *p++ = '\0';
 960                if (*dir) {     /* not earlier, catches series of ; */
 961                        ++n;
 962                }
 963        }
 964        if (!n)
 965                return NULL;
 966
 967        ALLOC_ARRAY(path, n + 1);
 968        p = envpath;
 969        i = 0;
 970        do {
 971                if (*p)
 972                        path[i++] = xstrdup(p);
 973                p = p+strlen(p)+1;
 974        } while (i < n);
 975        path[i] = NULL;
 976
 977        free(envpath);
 978
 979        return path;
 980}
 981
 982static void free_path_split(char **path)
 983{
 984        char **p = path;
 985
 986        if (!path)
 987                return;
 988
 989        while (*p)
 990                free(*p++);
 991        free(path);
 992}
 993
 994/*
 995 * exe_only means that we only want to detect .exe files, but not scripts
 996 * (which do not have an extension)
 997 */
 998static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 999{
1000        char path[MAX_PATH];
1001        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
1002
1003        if (!isexe && access(path, F_OK) == 0)
1004                return xstrdup(path);
1005        path[strlen(path)-4] = '\0';
1006        if ((!exe_only || isexe) && access(path, F_OK) == 0)
1007                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1008                        return xstrdup(path);
1009        return NULL;
1010}
1011
1012/*
1013 * Determines the absolute path of cmd using the split path in path.
1014 * If cmd contains a slash or backslash, no lookup is performed.
1015 */
1016static char *path_lookup(const char *cmd, char **path, int exe_only)
1017{
1018        char *prog = NULL;
1019        int len = strlen(cmd);
1020        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1021
1022        if (strchr(cmd, '/') || strchr(cmd, '\\'))
1023                prog = xstrdup(cmd);
1024
1025        while (!prog && *path)
1026                prog = lookup_prog(*path++, cmd, isexe, exe_only);
1027
1028        return prog;
1029}
1030
1031static int do_putenv(char **env, const char *name, int size, int free_old);
1032
1033/* used number of elements of environ array, including terminating NULL */
1034static int environ_size = 0;
1035/* allocated size of environ array, in bytes */
1036static int environ_alloc = 0;
1037
1038/*
1039 * Create environment block suitable for CreateProcess. Merges current
1040 * process environment and the supplied environment changes.
1041 */
1042static wchar_t *make_environment_block(char **deltaenv)
1043{
1044        wchar_t *wenvblk = NULL;
1045        char **tmpenv;
1046        int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1047
1048        while (deltaenv && deltaenv[i])
1049                i++;
1050
1051        /* copy the environment, leaving space for changes */
1052        ALLOC_ARRAY(tmpenv, size + i);
1053        memcpy(tmpenv, environ, size * sizeof(char*));
1054
1055        /* merge supplied environment changes into the temporary environment */
1056        for (i = 0; deltaenv && deltaenv[i]; i++)
1057                size = do_putenv(tmpenv, deltaenv[i], size, 0);
1058
1059        /* create environment block from temporary environment */
1060        for (i = 0; tmpenv[i]; i++) {
1061                size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1062                ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1063                wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1064        }
1065        /* add final \0 terminator */
1066        wenvblk[wenvpos] = 0;
1067        free(tmpenv);
1068        return wenvblk;
1069}
1070
1071struct pinfo_t {
1072        struct pinfo_t *next;
1073        pid_t pid;
1074        HANDLE proc;
1075};
1076static struct pinfo_t *pinfo = NULL;
1077CRITICAL_SECTION pinfo_cs;
1078
1079static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1080                              const char *dir,
1081                              int prepend_cmd, int fhin, int fhout, int fherr)
1082{
1083        STARTUPINFOW si;
1084        PROCESS_INFORMATION pi;
1085        struct strbuf args;
1086        wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1087        unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1088        BOOL ret;
1089
1090        /* Determine whether or not we are associated to a console */
1091        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1092                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1093                        FILE_ATTRIBUTE_NORMAL, NULL);
1094        if (cons == INVALID_HANDLE_VALUE) {
1095                /* There is no console associated with this process.
1096                 * Since the child is a console process, Windows
1097                 * would normally create a console window. But
1098                 * since we'll be redirecting std streams, we do
1099                 * not need the console.
1100                 * It is necessary to use DETACHED_PROCESS
1101                 * instead of CREATE_NO_WINDOW to make ssh
1102                 * recognize that it has no console.
1103                 */
1104                flags |= DETACHED_PROCESS;
1105        } else {
1106                /* There is already a console. If we specified
1107                 * DETACHED_PROCESS here, too, Windows would
1108                 * disassociate the child from the console.
1109                 * The same is true for CREATE_NO_WINDOW.
1110                 * Go figure!
1111                 */
1112                CloseHandle(cons);
1113        }
1114        memset(&si, 0, sizeof(si));
1115        si.cb = sizeof(si);
1116        si.dwFlags = STARTF_USESTDHANDLES;
1117        si.hStdInput = winansi_get_osfhandle(fhin);
1118        si.hStdOutput = winansi_get_osfhandle(fhout);
1119        si.hStdError = winansi_get_osfhandle(fherr);
1120
1121        if (xutftowcs_path(wcmd, cmd) < 0)
1122                return -1;
1123        if (dir && xutftowcs_path(wdir, dir) < 0)
1124                return -1;
1125
1126        /* concatenate argv, quoting args as we go */
1127        strbuf_init(&args, 0);
1128        if (prepend_cmd) {
1129                char *quoted = (char *)quote_arg(cmd);
1130                strbuf_addstr(&args, quoted);
1131                if (quoted != cmd)
1132                        free(quoted);
1133        }
1134        for (; *argv; argv++) {
1135                char *quoted = (char *)quote_arg(*argv);
1136                if (*args.buf)
1137                        strbuf_addch(&args, ' ');
1138                strbuf_addstr(&args, quoted);
1139                if (quoted != *argv)
1140                        free(quoted);
1141        }
1142
1143        ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1144        xutftowcs(wargs, args.buf, 2 * args.len + 1);
1145        strbuf_release(&args);
1146
1147        wenvblk = make_environment_block(deltaenv);
1148
1149        memset(&pi, 0, sizeof(pi));
1150        ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1151                wenvblk, dir ? wdir : NULL, &si, &pi);
1152
1153        free(wenvblk);
1154        free(wargs);
1155
1156        if (!ret) {
1157                errno = ENOENT;
1158                return -1;
1159        }
1160        CloseHandle(pi.hThread);
1161
1162        /*
1163         * The process ID is the human-readable identifier of the process
1164         * that we want to present in log and error messages. The handle
1165         * is not useful for this purpose. But we cannot close it, either,
1166         * because it is not possible to turn a process ID into a process
1167         * handle after the process terminated.
1168         * Keep the handle in a list for waitpid.
1169         */
1170        EnterCriticalSection(&pinfo_cs);
1171        {
1172                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1173                info->pid = pi.dwProcessId;
1174                info->proc = pi.hProcess;
1175                info->next = pinfo;
1176                pinfo = info;
1177        }
1178        LeaveCriticalSection(&pinfo_cs);
1179
1180        return (pid_t)pi.dwProcessId;
1181}
1182
1183static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1184{
1185        return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1186}
1187
1188pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1189                     const char *dir,
1190                     int fhin, int fhout, int fherr)
1191{
1192        pid_t pid;
1193        char **path = get_path_split();
1194        char *prog = path_lookup(cmd, path, 0);
1195
1196        if (!prog) {
1197                errno = ENOENT;
1198                pid = -1;
1199        }
1200        else {
1201                const char *interpr = parse_interpreter(prog);
1202
1203                if (interpr) {
1204                        const char *argv0 = argv[0];
1205                        char *iprog = path_lookup(interpr, path, 1);
1206                        argv[0] = prog;
1207                        if (!iprog) {
1208                                errno = ENOENT;
1209                                pid = -1;
1210                        }
1211                        else {
1212                                pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1213                                                       fhin, fhout, fherr);
1214                                free(iprog);
1215                        }
1216                        argv[0] = argv0;
1217                }
1218                else
1219                        pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1220                                               fhin, fhout, fherr);
1221                free(prog);
1222        }
1223        free_path_split(path);
1224        return pid;
1225}
1226
1227static int try_shell_exec(const char *cmd, char *const *argv)
1228{
1229        const char *interpr = parse_interpreter(cmd);
1230        char **path;
1231        char *prog;
1232        int pid = 0;
1233
1234        if (!interpr)
1235                return 0;
1236        path = get_path_split();
1237        prog = path_lookup(interpr, path, 1);
1238        if (prog) {
1239                int argc = 0;
1240                const char **argv2;
1241                while (argv[argc]) argc++;
1242                ALLOC_ARRAY(argv2, argc + 1);
1243                argv2[0] = (char *)cmd; /* full path to the script file */
1244                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1245                pid = mingw_spawnv(prog, argv2, 1);
1246                if (pid >= 0) {
1247                        int status;
1248                        if (waitpid(pid, &status, 0) < 0)
1249                                status = 255;
1250                        exit(status);
1251                }
1252                pid = 1;        /* indicate that we tried but failed */
1253                free(prog);
1254                free(argv2);
1255        }
1256        free_path_split(path);
1257        return pid;
1258}
1259
1260int mingw_execv(const char *cmd, char *const *argv)
1261{
1262        /* check if git_command is a shell script */
1263        if (!try_shell_exec(cmd, argv)) {
1264                int pid, status;
1265
1266                pid = mingw_spawnv(cmd, (const char **)argv, 0);
1267                if (pid < 0)
1268                        return -1;
1269                if (waitpid(pid, &status, 0) < 0)
1270                        status = 255;
1271                exit(status);
1272        }
1273        return -1;
1274}
1275
1276int mingw_execvp(const char *cmd, char *const *argv)
1277{
1278        char **path = get_path_split();
1279        char *prog = path_lookup(cmd, path, 0);
1280
1281        if (prog) {
1282                mingw_execv(prog, argv);
1283                free(prog);
1284        } else
1285                errno = ENOENT;
1286
1287        free_path_split(path);
1288        return -1;
1289}
1290
1291int mingw_kill(pid_t pid, int sig)
1292{
1293        if (pid > 0 && sig == SIGTERM) {
1294                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1295
1296                if (TerminateProcess(h, -1)) {
1297                        CloseHandle(h);
1298                        return 0;
1299                }
1300
1301                errno = err_win_to_posix(GetLastError());
1302                CloseHandle(h);
1303                return -1;
1304        } else if (pid > 0 && sig == 0) {
1305                HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1306                if (h) {
1307                        CloseHandle(h);
1308                        return 0;
1309                }
1310        }
1311
1312        errno = EINVAL;
1313        return -1;
1314}
1315
1316/*
1317 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1318 */
1319static int compareenv(const void *v1, const void *v2)
1320{
1321        const char *e1 = *(const char**)v1;
1322        const char *e2 = *(const char**)v2;
1323
1324        for (;;) {
1325                int c1 = *e1++;
1326                int c2 = *e2++;
1327                c1 = (c1 == '=') ? 0 : tolower(c1);
1328                c2 = (c2 == '=') ? 0 : tolower(c2);
1329                if (c1 > c2)
1330                        return 1;
1331                if (c1 < c2)
1332                        return -1;
1333                if (c1 == 0)
1334                        return 0;
1335        }
1336}
1337
1338static int bsearchenv(char **env, const char *name, size_t size)
1339{
1340        unsigned low = 0, high = size;
1341        while (low < high) {
1342                unsigned mid = low + ((high - low) >> 1);
1343                int cmp = compareenv(&env[mid], &name);
1344                if (cmp < 0)
1345                        low = mid + 1;
1346                else if (cmp > 0)
1347                        high = mid;
1348                else
1349                        return mid;
1350        }
1351        return ~low; /* not found, return 1's complement of insert position */
1352}
1353
1354/*
1355 * If name contains '=', then sets the variable, otherwise it unsets it
1356 * Size includes the terminating NULL. Env must have room for size + 1 entries
1357 * (in case of insert). Returns the new size. Optionally frees removed entries.
1358 */
1359static int do_putenv(char **env, const char *name, int size, int free_old)
1360{
1361        int i = bsearchenv(env, name, size - 1);
1362
1363        /* optionally free removed / replaced entry */
1364        if (i >= 0 && free_old)
1365                free(env[i]);
1366
1367        if (strchr(name, '=')) {
1368                /* if new value ('key=value') is specified, insert or replace entry */
1369                if (i < 0) {
1370                        i = ~i;
1371                        memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1372                        size++;
1373                }
1374                env[i] = (char*) name;
1375        } else if (i >= 0) {
1376                /* otherwise ('key') remove existing entry */
1377                size--;
1378                memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1379        }
1380        return size;
1381}
1382
1383char *mingw_getenv(const char *name)
1384{
1385        char *value;
1386        int pos = bsearchenv(environ, name, environ_size - 1);
1387        if (pos < 0)
1388                return NULL;
1389        value = strchr(environ[pos], '=');
1390        return value ? &value[1] : NULL;
1391}
1392
1393int mingw_putenv(const char *namevalue)
1394{
1395        ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1396        environ_size = do_putenv(environ, namevalue, environ_size, 1);
1397        return 0;
1398}
1399
1400/*
1401 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1402 * that service contains a numerical port, or that it is null. It
1403 * does a simple search using gethostbyname, and returns one IPv4 host
1404 * if one was found.
1405 */
1406static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1407                                   const struct addrinfo *hints,
1408                                   struct addrinfo **res)
1409{
1410        struct hostent *h = NULL;
1411        struct addrinfo *ai;
1412        struct sockaddr_in *sin;
1413
1414        if (node) {
1415                h = gethostbyname(node);
1416                if (!h)
1417                        return WSAGetLastError();
1418        }
1419
1420        ai = xmalloc(sizeof(struct addrinfo));
1421        *res = ai;
1422        ai->ai_flags = 0;
1423        ai->ai_family = AF_INET;
1424        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1425        switch (ai->ai_socktype) {
1426        case SOCK_STREAM:
1427                ai->ai_protocol = IPPROTO_TCP;
1428                break;
1429        case SOCK_DGRAM:
1430                ai->ai_protocol = IPPROTO_UDP;
1431                break;
1432        default:
1433                ai->ai_protocol = 0;
1434                break;
1435        }
1436        ai->ai_addrlen = sizeof(struct sockaddr_in);
1437        if (hints && (hints->ai_flags & AI_CANONNAME))
1438                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1439        else
1440                ai->ai_canonname = NULL;
1441
1442        sin = xcalloc(1, ai->ai_addrlen);
1443        sin->sin_family = AF_INET;
1444        /* Note: getaddrinfo is supposed to allow service to be a string,
1445         * which should be looked up using getservbyname. This is
1446         * currently not implemented */
1447        if (service)
1448                sin->sin_port = htons(atoi(service));
1449        if (h)
1450                sin->sin_addr = *(struct in_addr *)h->h_addr;
1451        else if (hints && (hints->ai_flags & AI_PASSIVE))
1452                sin->sin_addr.s_addr = INADDR_ANY;
1453        else
1454                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1455        ai->ai_addr = (struct sockaddr *)sin;
1456        ai->ai_next = NULL;
1457        return 0;
1458}
1459
1460static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1461{
1462        free(res->ai_canonname);
1463        free(res->ai_addr);
1464        free(res);
1465}
1466
1467static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1468                                   char *host, DWORD hostlen,
1469                                   char *serv, DWORD servlen, int flags)
1470{
1471        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1472        if (sa->sa_family != AF_INET)
1473                return EAI_FAMILY;
1474        if (!host && !serv)
1475                return EAI_NONAME;
1476
1477        if (host && hostlen > 0) {
1478                struct hostent *ent = NULL;
1479                if (!(flags & NI_NUMERICHOST))
1480                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1481                                            sizeof(sin->sin_addr), AF_INET);
1482
1483                if (ent)
1484                        snprintf(host, hostlen, "%s", ent->h_name);
1485                else if (flags & NI_NAMEREQD)
1486                        return EAI_NONAME;
1487                else
1488                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1489        }
1490
1491        if (serv && servlen > 0) {
1492                struct servent *ent = NULL;
1493                if (!(flags & NI_NUMERICSERV))
1494                        ent = getservbyport(sin->sin_port,
1495                                            flags & NI_DGRAM ? "udp" : "tcp");
1496
1497                if (ent)
1498                        snprintf(serv, servlen, "%s", ent->s_name);
1499                else
1500                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1501        }
1502
1503        return 0;
1504}
1505
1506static HMODULE ipv6_dll = NULL;
1507static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1508static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1509                                      const struct addrinfo *hints,
1510                                      struct addrinfo **res);
1511static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1512                                      char *host, DWORD hostlen,
1513                                      char *serv, DWORD servlen, int flags);
1514/*
1515 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1516 * don't need to try to load that one dynamically.
1517 */
1518
1519static void socket_cleanup(void)
1520{
1521        WSACleanup();
1522        if (ipv6_dll)
1523                FreeLibrary(ipv6_dll);
1524        ipv6_dll = NULL;
1525        ipv6_freeaddrinfo = freeaddrinfo_stub;
1526        ipv6_getaddrinfo = getaddrinfo_stub;
1527        ipv6_getnameinfo = getnameinfo_stub;
1528}
1529
1530static void ensure_socket_initialization(void)
1531{
1532        WSADATA wsa;
1533        static int initialized = 0;
1534        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1535        const char **name;
1536
1537        if (initialized)
1538                return;
1539
1540        if (WSAStartup(MAKEWORD(2,2), &wsa))
1541                die("unable to initialize winsock subsystem, error %d",
1542                        WSAGetLastError());
1543
1544        for (name = libraries; *name; name++) {
1545                ipv6_dll = LoadLibrary(*name);
1546                if (!ipv6_dll)
1547                        continue;
1548
1549                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1550                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1551                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1552                                                   const struct addrinfo *,
1553                                                   struct addrinfo **))
1554                        GetProcAddress(ipv6_dll, "getaddrinfo");
1555                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1556                                                   socklen_t, char *, DWORD,
1557                                                   char *, DWORD, int))
1558                        GetProcAddress(ipv6_dll, "getnameinfo");
1559                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1560                        FreeLibrary(ipv6_dll);
1561                        ipv6_dll = NULL;
1562                } else
1563                        break;
1564        }
1565        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1566                ipv6_freeaddrinfo = freeaddrinfo_stub;
1567                ipv6_getaddrinfo = getaddrinfo_stub;
1568                ipv6_getnameinfo = getnameinfo_stub;
1569        }
1570
1571        atexit(socket_cleanup);
1572        initialized = 1;
1573}
1574
1575#undef gethostname
1576int mingw_gethostname(char *name, int namelen)
1577{
1578    ensure_socket_initialization();
1579    return gethostname(name, namelen);
1580}
1581
1582#undef gethostbyname
1583struct hostent *mingw_gethostbyname(const char *host)
1584{
1585        ensure_socket_initialization();
1586        return gethostbyname(host);
1587}
1588
1589void mingw_freeaddrinfo(struct addrinfo *res)
1590{
1591        ipv6_freeaddrinfo(res);
1592}
1593
1594int mingw_getaddrinfo(const char *node, const char *service,
1595                      const struct addrinfo *hints, struct addrinfo **res)
1596{
1597        ensure_socket_initialization();
1598        return ipv6_getaddrinfo(node, service, hints, res);
1599}
1600
1601int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1602                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1603                      int flags)
1604{
1605        ensure_socket_initialization();
1606        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1607}
1608
1609int mingw_socket(int domain, int type, int protocol)
1610{
1611        int sockfd;
1612        SOCKET s;
1613
1614        ensure_socket_initialization();
1615        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1616        if (s == INVALID_SOCKET) {
1617                /*
1618                 * WSAGetLastError() values are regular BSD error codes
1619                 * biased by WSABASEERR.
1620                 * However, strerror() does not know about networking
1621                 * specific errors, which are values beginning at 38 or so.
1622                 * Therefore, we choose to leave the biased error code
1623                 * in errno so that _if_ someone looks up the code somewhere,
1624                 * then it is at least the number that are usually listed.
1625                 */
1626                errno = WSAGetLastError();
1627                return -1;
1628        }
1629        /* convert into a file descriptor */
1630        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1631                closesocket(s);
1632                return error("unable to make a socket file descriptor: %s",
1633                        strerror(errno));
1634        }
1635        return sockfd;
1636}
1637
1638#undef connect
1639int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1640{
1641        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1642        return connect(s, sa, sz);
1643}
1644
1645#undef bind
1646int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1647{
1648        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1649        return bind(s, sa, sz);
1650}
1651
1652#undef setsockopt
1653int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1654{
1655        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1656        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1657}
1658
1659#undef shutdown
1660int mingw_shutdown(int sockfd, int how)
1661{
1662        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1663        return shutdown(s, how);
1664}
1665
1666#undef listen
1667int mingw_listen(int sockfd, int backlog)
1668{
1669        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1670        return listen(s, backlog);
1671}
1672
1673#undef accept
1674int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1675{
1676        int sockfd2;
1677
1678        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1679        SOCKET s2 = accept(s1, sa, sz);
1680
1681        /* convert into a file descriptor */
1682        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1683                int err = errno;
1684                closesocket(s2);
1685                return error("unable to make a socket file descriptor: %s",
1686                        strerror(err));
1687        }
1688        return sockfd2;
1689}
1690
1691#undef rename
1692int mingw_rename(const char *pold, const char *pnew)
1693{
1694        DWORD attrs, gle;
1695        int tries = 0;
1696        wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1697        if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1698                return -1;
1699
1700        /*
1701         * Try native rename() first to get errno right.
1702         * It is based on MoveFile(), which cannot overwrite existing files.
1703         */
1704        if (!_wrename(wpold, wpnew))
1705                return 0;
1706        if (errno != EEXIST)
1707                return -1;
1708repeat:
1709        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1710                return 0;
1711        /* TODO: translate more errors */
1712        gle = GetLastError();
1713        if (gle == ERROR_ACCESS_DENIED &&
1714            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1715                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1716                        DWORD attrsold = GetFileAttributesW(wpold);
1717                        if (attrsold == INVALID_FILE_ATTRIBUTES ||
1718                            !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1719                                errno = EISDIR;
1720                        else if (!_wrmdir(wpnew))
1721                                goto repeat;
1722                        return -1;
1723                }
1724                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1725                    SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1726                        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1727                                return 0;
1728                        gle = GetLastError();
1729                        /* revert file attributes on failure */
1730                        SetFileAttributesW(wpnew, attrs);
1731                }
1732        }
1733        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1734                /*
1735                 * We assume that some other process had the source or
1736                 * destination file open at the wrong moment and retry.
1737                 * In order to give the other process a higher chance to
1738                 * complete its operation, we give up our time slice now.
1739                 * If we have to retry again, we do sleep a bit.
1740                 */
1741                Sleep(delay[tries]);
1742                tries++;
1743                goto repeat;
1744        }
1745        if (gle == ERROR_ACCESS_DENIED &&
1746               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1747                       "Should I try again?", pold, pnew))
1748                goto repeat;
1749
1750        errno = EACCES;
1751        return -1;
1752}
1753
1754/*
1755 * Note that this doesn't return the actual pagesize, but
1756 * the allocation granularity. If future Windows specific git code
1757 * needs the real getpagesize function, we need to find another solution.
1758 */
1759int mingw_getpagesize(void)
1760{
1761        SYSTEM_INFO si;
1762        GetSystemInfo(&si);
1763        return si.dwAllocationGranularity;
1764}
1765
1766struct passwd *getpwuid(int uid)
1767{
1768        static char user_name[100];
1769        static struct passwd p;
1770
1771        DWORD len = sizeof(user_name);
1772        if (!GetUserName(user_name, &len))
1773                return NULL;
1774        p.pw_name = user_name;
1775        p.pw_gecos = "unknown";
1776        p.pw_dir = NULL;
1777        return &p;
1778}
1779
1780static HANDLE timer_event;
1781static HANDLE timer_thread;
1782static int timer_interval;
1783static int one_shot;
1784static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1785
1786/* The timer works like this:
1787 * The thread, ticktack(), is a trivial routine that most of the time
1788 * only waits to receive the signal to terminate. The main thread tells
1789 * the thread to terminate by setting the timer_event to the signalled
1790 * state.
1791 * But ticktack() interrupts the wait state after the timer's interval
1792 * length to call the signal handler.
1793 */
1794
1795static unsigned __stdcall ticktack(void *dummy)
1796{
1797        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1798                mingw_raise(SIGALRM);
1799                if (one_shot)
1800                        break;
1801        }
1802        return 0;
1803}
1804
1805static int start_timer_thread(void)
1806{
1807        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1808        if (timer_event) {
1809                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1810                if (!timer_thread )
1811                        return errno = ENOMEM,
1812                                error("cannot start timer thread");
1813        } else
1814                return errno = ENOMEM,
1815                        error("cannot allocate resources for timer");
1816        return 0;
1817}
1818
1819static void stop_timer_thread(void)
1820{
1821        if (timer_event)
1822                SetEvent(timer_event);  /* tell thread to terminate */
1823        if (timer_thread) {
1824                int rc = WaitForSingleObject(timer_thread, 1000);
1825                if (rc == WAIT_TIMEOUT)
1826                        error("timer thread did not terminate timely");
1827                else if (rc != WAIT_OBJECT_0)
1828                        error("waiting for timer thread failed: %lu",
1829                              GetLastError());
1830                CloseHandle(timer_thread);
1831        }
1832        if (timer_event)
1833                CloseHandle(timer_event);
1834        timer_event = NULL;
1835        timer_thread = NULL;
1836}
1837
1838static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1839{
1840        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1841}
1842
1843int setitimer(int type, struct itimerval *in, struct itimerval *out)
1844{
1845        static const struct timeval zero;
1846        static int atexit_done;
1847
1848        if (out != NULL)
1849                return errno = EINVAL,
1850                        error("setitimer param 3 != NULL not implemented");
1851        if (!is_timeval_eq(&in->it_interval, &zero) &&
1852            !is_timeval_eq(&in->it_interval, &in->it_value))
1853                return errno = EINVAL,
1854                        error("setitimer: it_interval must be zero or eq it_value");
1855
1856        if (timer_thread)
1857                stop_timer_thread();
1858
1859        if (is_timeval_eq(&in->it_value, &zero) &&
1860            is_timeval_eq(&in->it_interval, &zero))
1861                return 0;
1862
1863        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1864        one_shot = is_timeval_eq(&in->it_interval, &zero);
1865        if (!atexit_done) {
1866                atexit(stop_timer_thread);
1867                atexit_done = 1;
1868        }
1869        return start_timer_thread();
1870}
1871
1872int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1873{
1874        if (sig != SIGALRM)
1875                return errno = EINVAL,
1876                        error("sigaction only implemented for SIGALRM");
1877        if (out != NULL)
1878                return errno = EINVAL,
1879                        error("sigaction: param 3 != NULL not implemented");
1880
1881        timer_fn = in->sa_handler;
1882        return 0;
1883}
1884
1885#undef signal
1886sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1887{
1888        sig_handler_t old;
1889
1890        switch (sig) {
1891        case SIGALRM:
1892                old = timer_fn;
1893                timer_fn = handler;
1894                break;
1895
1896        case SIGINT:
1897                old = sigint_fn;
1898                sigint_fn = handler;
1899                break;
1900
1901        default:
1902                return signal(sig, handler);
1903        }
1904
1905        return old;
1906}
1907
1908#undef raise
1909int mingw_raise(int sig)
1910{
1911        switch (sig) {
1912        case SIGALRM:
1913                if (timer_fn == SIG_DFL) {
1914                        if (isatty(STDERR_FILENO))
1915                                fputs("Alarm clock\n", stderr);
1916                        exit(128 + SIGALRM);
1917                } else if (timer_fn != SIG_IGN)
1918                        timer_fn(SIGALRM);
1919                return 0;
1920
1921        case SIGINT:
1922                if (sigint_fn == SIG_DFL)
1923                        exit(128 + SIGINT);
1924                else if (sigint_fn != SIG_IGN)
1925                        sigint_fn(SIGINT);
1926                return 0;
1927
1928        default:
1929                return raise(sig);
1930        }
1931}
1932
1933
1934static const char *make_backslash_path(const char *path)
1935{
1936        static char buf[PATH_MAX + 1];
1937        char *c;
1938
1939        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1940                die("Too long path: %.*s", 60, path);
1941
1942        for (c = buf; *c; c++) {
1943                if (*c == '/')
1944                        *c = '\\';
1945        }
1946        return buf;
1947}
1948
1949void mingw_open_html(const char *unixpath)
1950{
1951        const char *htmlpath = make_backslash_path(unixpath);
1952        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1953                        const char *, const char *, const char *, INT);
1954        T ShellExecute;
1955        HMODULE shell32;
1956        int r;
1957
1958        shell32 = LoadLibrary("shell32.dll");
1959        if (!shell32)
1960                die("cannot load shell32.dll");
1961        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1962        if (!ShellExecute)
1963                die("cannot run browser");
1964
1965        printf("Launching default browser to display HTML ...\n");
1966        r = HCAST(int, ShellExecute(NULL, "open", htmlpath,
1967                                NULL, "\\", SW_SHOWNORMAL));
1968        FreeLibrary(shell32);
1969        /* see the MSDN documentation referring to the result codes here */
1970        if (r <= 32) {
1971                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1972        }
1973}
1974
1975int link(const char *oldpath, const char *newpath)
1976{
1977        typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1978        static T create_hard_link = NULL;
1979        wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1980        if (xutftowcs_path(woldpath, oldpath) < 0 ||
1981                xutftowcs_path(wnewpath, newpath) < 0)
1982                return -1;
1983
1984        if (!create_hard_link) {
1985                create_hard_link = (T) GetProcAddress(
1986                        GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1987                if (!create_hard_link)
1988                        create_hard_link = (T)-1;
1989        }
1990        if (create_hard_link == (T)-1) {
1991                errno = ENOSYS;
1992                return -1;
1993        }
1994        if (!create_hard_link(wnewpath, woldpath, NULL)) {
1995                errno = err_win_to_posix(GetLastError());
1996                return -1;
1997        }
1998        return 0;
1999}
2000
2001pid_t waitpid(pid_t pid, int *status, int options)
2002{
2003        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2004            FALSE, pid);
2005        if (!h) {
2006                errno = ECHILD;
2007                return -1;
2008        }
2009
2010        if (pid > 0 && options & WNOHANG) {
2011                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2012                        CloseHandle(h);
2013                        return 0;
2014                }
2015                options &= ~WNOHANG;
2016        }
2017
2018        if (options == 0) {
2019                struct pinfo_t **ppinfo;
2020                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2021                        CloseHandle(h);
2022                        return 0;
2023                }
2024
2025                if (status)
2026                        GetExitCodeProcess(h, (LPDWORD)status);
2027
2028                EnterCriticalSection(&pinfo_cs);
2029
2030                ppinfo = &pinfo;
2031                while (*ppinfo) {
2032                        struct pinfo_t *info = *ppinfo;
2033                        if (info->pid == pid) {
2034                                CloseHandle(info->proc);
2035                                *ppinfo = info->next;
2036                                free(info);
2037                                break;
2038                        }
2039                        ppinfo = &info->next;
2040                }
2041
2042                LeaveCriticalSection(&pinfo_cs);
2043
2044                CloseHandle(h);
2045                return pid;
2046        }
2047        CloseHandle(h);
2048
2049        errno = EINVAL;
2050        return -1;
2051}
2052
2053int mingw_skip_dos_drive_prefix(char **path)
2054{
2055        int ret = has_dos_drive_prefix(*path);
2056        *path += ret;
2057        return ret;
2058}
2059
2060int mingw_offset_1st_component(const char *path)
2061{
2062        char *pos = (char *)path;
2063
2064        /* unc paths */
2065        if (!skip_dos_drive_prefix(&pos) &&
2066                        is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2067                /* skip server name */
2068                pos = strpbrk(pos + 2, "\\/");
2069                if (!pos)
2070                        return 0; /* Error: malformed unc path */
2071
2072                do {
2073                        pos++;
2074                } while (*pos && !is_dir_sep(*pos));
2075        }
2076
2077        return pos + is_dir_sep(*pos) - path;
2078}
2079
2080int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2081{
2082        int upos = 0, wpos = 0;
2083        const unsigned char *utf = (const unsigned char*) utfs;
2084        if (!utf || !wcs || wcslen < 1) {
2085                errno = EINVAL;
2086                return -1;
2087        }
2088        /* reserve space for \0 */
2089        wcslen--;
2090        if (utflen < 0)
2091                utflen = INT_MAX;
2092
2093        while (upos < utflen) {
2094                int c = utf[upos++] & 0xff;
2095                if (utflen == INT_MAX && c == 0)
2096                        break;
2097
2098                if (wpos >= wcslen) {
2099                        wcs[wpos] = 0;
2100                        errno = ERANGE;
2101                        return -1;
2102                }
2103
2104                if (c < 0x80) {
2105                        /* ASCII */
2106                        wcs[wpos++] = c;
2107                } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2108                                (utf[upos] & 0xc0) == 0x80) {
2109                        /* 2-byte utf-8 */
2110                        c = ((c & 0x1f) << 6);
2111                        c |= (utf[upos++] & 0x3f);
2112                        wcs[wpos++] = c;
2113                } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2114                                !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2115                                (utf[upos] & 0xc0) == 0x80 &&
2116                                (utf[upos + 1] & 0xc0) == 0x80) {
2117                        /* 3-byte utf-8 */
2118                        c = ((c & 0x0f) << 12);
2119                        c |= ((utf[upos++] & 0x3f) << 6);
2120                        c |= (utf[upos++] & 0x3f);
2121                        wcs[wpos++] = c;
2122                } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2123                                wpos + 1 < wcslen &&
2124                                !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2125                                !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2126                                (utf[upos] & 0xc0) == 0x80 &&
2127                                (utf[upos + 1] & 0xc0) == 0x80 &&
2128                                (utf[upos + 2] & 0xc0) == 0x80) {
2129                        /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2130                        c = ((c & 0x07) << 18);
2131                        c |= ((utf[upos++] & 0x3f) << 12);
2132                        c |= ((utf[upos++] & 0x3f) << 6);
2133                        c |= (utf[upos++] & 0x3f);
2134                        c -= 0x10000;
2135                        wcs[wpos++] = 0xd800 | (c >> 10);
2136                        wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2137                } else if (c >= 0xa0) {
2138                        /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2139                        wcs[wpos++] = c;
2140                } else {
2141                        /* invalid utf-8 byte, non-printable unicode: convert to hex */
2142                        static const char *hex = "0123456789abcdef";
2143                        wcs[wpos++] = hex[c >> 4];
2144                        if (wpos < wcslen)
2145                                wcs[wpos++] = hex[c & 0x0f];
2146                }
2147        }
2148        wcs[wpos] = 0;
2149        return wpos;
2150}
2151
2152int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2153{
2154        if (!wcs || !utf || utflen < 1) {
2155                errno = EINVAL;
2156                return -1;
2157        }
2158        utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2159        if (utflen)
2160                return utflen - 1;
2161        errno = ERANGE;
2162        return -1;
2163}
2164
2165static void setup_windows_environment()
2166{
2167        char *tmp = getenv("TMPDIR");
2168
2169        /* on Windows it is TMP and TEMP */
2170        if (!tmp) {
2171                if (!(tmp = getenv("TMP")))
2172                        tmp = getenv("TEMP");
2173                if (tmp) {
2174                        setenv("TMPDIR", tmp, 1);
2175                        tmp = getenv("TMPDIR");
2176                }
2177        }
2178
2179        if (tmp) {
2180                /*
2181                 * Convert all dir separators to forward slashes,
2182                 * to help shell commands called from the Git
2183                 * executable (by not mistaking the dir separators
2184                 * for escape characters).
2185                 */
2186                convert_slashes(tmp);
2187        }
2188
2189        /* simulate TERM to enable auto-color (see color.c) */
2190        if (!getenv("TERM"))
2191                setenv("TERM", "cygwin", 1);
2192}
2193
2194/*
2195 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2196 * mingw startup code, see init.c in mingw runtime).
2197 */
2198int _CRT_glob = 0;
2199
2200typedef struct {
2201        int newmode;
2202} _startupinfo;
2203
2204extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2205                _startupinfo *si);
2206
2207static NORETURN void die_startup()
2208{
2209        fputs("fatal: not enough memory for initialization", stderr);
2210        exit(128);
2211}
2212
2213static void *malloc_startup(size_t size)
2214{
2215        void *result = malloc(size);
2216        if (!result)
2217                die_startup();
2218        return result;
2219}
2220
2221static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2222{
2223        len = xwcstoutf(buffer, wcs, len) + 1;
2224        return memcpy(malloc_startup(len), buffer, len);
2225}
2226
2227void mingw_startup()
2228{
2229        int i, maxlen, argc;
2230        char *buffer;
2231        wchar_t **wenv, **wargv;
2232        _startupinfo si;
2233
2234        /* get wide char arguments and environment */
2235        si.newmode = 0;
2236        if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2237                die_startup();
2238
2239        /* determine size of argv and environ conversion buffer */
2240        maxlen = wcslen(_wpgmptr);
2241        for (i = 1; i < argc; i++)
2242                maxlen = max(maxlen, wcslen(wargv[i]));
2243        for (i = 0; wenv[i]; i++)
2244                maxlen = max(maxlen, wcslen(wenv[i]));
2245
2246        /*
2247         * nedmalloc can't free CRT memory, allocate resizable environment
2248         * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2249         * use it while initializing the environment itself.
2250         */
2251        environ_size = i + 1;
2252        environ_alloc = alloc_nr(environ_size * sizeof(char*));
2253        environ = malloc_startup(environ_alloc);
2254
2255        /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2256        maxlen = 3 * maxlen + 1;
2257        buffer = malloc_startup(maxlen);
2258
2259        /* convert command line arguments and environment to UTF-8 */
2260        __argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
2261        for (i = 1; i < argc; i++)
2262                __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2263        for (i = 0; wenv[i]; i++)
2264                environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2265        environ[i] = NULL;
2266        free(buffer);
2267
2268        /* sort environment for O(log n) getenv / putenv */
2269        qsort(environ, i, sizeof(char*), compareenv);
2270
2271        /* fix Windows specific environment settings */
2272        setup_windows_environment();
2273
2274        /* initialize critical section for waitpid pinfo_t list */
2275        InitializeCriticalSection(&pinfo_cs);
2276
2277        /* set up default file mode and file modes for stdin/out/err */
2278        _fmode = _O_BINARY;
2279        _setmode(_fileno(stdin), _O_BINARY);
2280        _setmode(_fileno(stdout), _O_BINARY);
2281        _setmode(_fileno(stderr), _O_BINARY);
2282
2283        /* initialize Unicode console */
2284        winansi_init();
2285}
2286
2287int uname(struct utsname *buf)
2288{
2289        unsigned v = (unsigned)GetVersion();
2290        memset(buf, 0, sizeof(*buf));
2291        xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2292        xsnprintf(buf->release, sizeof(buf->release),
2293                 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2294        /* assuming NT variants only.. */
2295        xsnprintf(buf->version, sizeof(buf->version),
2296                  "%u", (v >> 16) & 0x7fff);
2297        return 0;
2298}