Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'bg/format-patch-doc-update' (1a02a85)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6#include <shellapi.h>
   7
   8static int err_win_to_posix(DWORD winerr)
   9{
  10        int error = ENOSYS;
  11        switch(winerr) {
  12        case ERROR_ACCESS_DENIED: error = EACCES; break;
  13        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  14        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  15        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  16        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  17        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  18        case ERROR_BAD_COMMAND: error = EIO; break;
  19        case ERROR_BAD_DEVICE: error = ENODEV; break;
  20        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  21        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  22        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  23        case ERROR_BAD_LENGTH: error = EINVAL; break;
  24        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  25        case ERROR_BAD_PIPE: error = EPIPE; break;
  26        case ERROR_BAD_UNIT: error = ENODEV; break;
  27        case ERROR_BAD_USERNAME: error = EINVAL; break;
  28        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  29        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  30        case ERROR_BUSY: error = EBUSY; break;
  31        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  32        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  33        case ERROR_CANNOT_MAKE: error = EACCES; break;
  34        case ERROR_CANTOPEN: error = EIO; break;
  35        case ERROR_CANTREAD: error = EIO; break;
  36        case ERROR_CANTWRITE: error = EIO; break;
  37        case ERROR_CRC: error = EIO; break;
  38        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  39        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  40        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  41        case ERROR_DIRECTORY: error = EINVAL; break;
  42        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  43        case ERROR_DISK_CHANGE: error = EIO; break;
  44        case ERROR_DISK_FULL: error = ENOSPC; break;
  45        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  46        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  47        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  48        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  49        case ERROR_FILE_EXISTS: error = EEXIST; break;
  50        case ERROR_FILE_INVALID: error = ENODEV; break;
  51        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  52        case ERROR_GEN_FAILURE: error = EIO; break;
  53        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  54        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  55        case ERROR_INVALID_ACCESS: error = EACCES; break;
  56        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  57        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  58        case ERROR_INVALID_DATA: error = EINVAL; break;
  59        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  60        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  61        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  62        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  63        case ERROR_INVALID_HANDLE: error = EBADF; break;
  64        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  65        case ERROR_INVALID_NAME: error = EINVAL; break;
  66        case ERROR_INVALID_OWNER: error = EINVAL; break;
  67        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  68        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  69        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  70        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  71        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  72        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  73        case ERROR_IO_DEVICE: error = EIO; break;
  74        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  75        case ERROR_LOCKED: error = EBUSY; break;
  76        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  77        case ERROR_LOGON_FAILURE: error = EACCES; break;
  78        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  79        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  80        case ERROR_MORE_DATA: error = EPIPE; break;
  81        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  82        case ERROR_NOACCESS: error = EFAULT; break;
  83        case ERROR_NONE_MAPPED: error = EINVAL; break;
  84        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  85        case ERROR_NOT_READY: error = EAGAIN; break;
  86        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  87        case ERROR_NO_DATA: error = EPIPE; break;
  88        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  89        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  90        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  91        case ERROR_OPEN_FAILED: error = EIO; break;
  92        case ERROR_OPEN_FILES: error = EBUSY; break;
  93        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  94        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  95        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  96        case ERROR_PATH_BUSY: error = EBUSY; break;
  97        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  98        case ERROR_PIPE_BUSY: error = EBUSY; break;
  99        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 100        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 101        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 102        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 103        case ERROR_READ_FAULT: error = EIO; break;
 104        case ERROR_SEEK: error = EIO; break;
 105        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 106        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 107        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 108        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 109        case ERROR_SWAPERROR: error = ENOENT; break;
 110        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 111        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 112        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 113        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 114        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 115        case ERROR_WRITE_FAULT: error = EIO; break;
 116        case ERROR_WRITE_PROTECT: error = EROFS; break;
 117        }
 118        return error;
 119}
 120
 121#undef open
 122int mingw_open (const char *filename, int oflags, ...)
 123{
 124        va_list args;
 125        unsigned mode;
 126        int fd;
 127
 128        va_start(args, oflags);
 129        mode = va_arg(args, int);
 130        va_end(args);
 131
 132        if (!strcmp(filename, "/dev/null"))
 133                filename = "nul";
 134
 135        fd = open(filename, oflags, mode);
 136
 137        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 138                DWORD attrs = GetFileAttributes(filename);
 139                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 140                        errno = EISDIR;
 141        }
 142        return fd;
 143}
 144
 145static inline time_t filetime_to_time_t(const FILETIME *ft)
 146{
 147        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 148        winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 149        winTime /= 10000000;             /* Nano to seconds resolution */
 150        return (time_t)winTime;
 151}
 152
 153/* We keep the do_lstat code in a separate function to avoid recursion.
 154 * When a path ends with a slash, the stat will fail with ENOENT. In
 155 * this case, we strip the trailing slashes and stat again.
 156 */
 157static int do_lstat(const char *file_name, struct stat *buf)
 158{
 159        WIN32_FILE_ATTRIBUTE_DATA fdata;
 160
 161        if (!(errno = get_file_attr(file_name, &fdata))) {
 162                buf->st_ino = 0;
 163                buf->st_gid = 0;
 164                buf->st_uid = 0;
 165                buf->st_nlink = 1;
 166                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 167                buf->st_size = fdata.nFileSizeLow |
 168                        (((off_t)fdata.nFileSizeHigh)<<32);
 169                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 170                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 171                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 172                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 173                return 0;
 174        }
 175        return -1;
 176}
 177
 178/* We provide our own lstat/fstat functions, since the provided
 179 * lstat/fstat functions are so slow. These stat functions are
 180 * tailored for Git's usage (read: fast), and are not meant to be
 181 * complete. Note that Git stat()s are redirected to mingw_lstat()
 182 * too, since Windows doesn't really handle symlinks that well.
 183 */
 184int mingw_lstat(const char *file_name, struct stat *buf)
 185{
 186        int namelen;
 187        static char alt_name[PATH_MAX];
 188
 189        if (!do_lstat(file_name, buf))
 190                return 0;
 191
 192        /* if file_name ended in a '/', Windows returned ENOENT;
 193         * try again without trailing slashes
 194         */
 195        if (errno != ENOENT)
 196                return -1;
 197
 198        namelen = strlen(file_name);
 199        if (namelen && file_name[namelen-1] != '/')
 200                return -1;
 201        while (namelen && file_name[namelen-1] == '/')
 202                --namelen;
 203        if (!namelen || namelen >= PATH_MAX)
 204                return -1;
 205
 206        memcpy(alt_name, file_name, namelen);
 207        alt_name[namelen] = 0;
 208        return do_lstat(alt_name, buf);
 209}
 210
 211#undef fstat
 212int mingw_fstat(int fd, struct stat *buf)
 213{
 214        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 215        BY_HANDLE_FILE_INFORMATION fdata;
 216
 217        if (fh == INVALID_HANDLE_VALUE) {
 218                errno = EBADF;
 219                return -1;
 220        }
 221        /* direct non-file handles to MS's fstat() */
 222        if (GetFileType(fh) != FILE_TYPE_DISK)
 223                return _fstati64(fd, buf);
 224
 225        if (GetFileInformationByHandle(fh, &fdata)) {
 226                buf->st_ino = 0;
 227                buf->st_gid = 0;
 228                buf->st_uid = 0;
 229                buf->st_nlink = 1;
 230                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 231                buf->st_size = fdata.nFileSizeLow |
 232                        (((off_t)fdata.nFileSizeHigh)<<32);
 233                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 234                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 235                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 236                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 237                return 0;
 238        }
 239        errno = EBADF;
 240        return -1;
 241}
 242
 243static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 244{
 245        long long winTime = t * 10000000LL + 116444736000000000LL;
 246        ft->dwLowDateTime = winTime;
 247        ft->dwHighDateTime = winTime >> 32;
 248}
 249
 250int mingw_utime (const char *file_name, const struct utimbuf *times)
 251{
 252        FILETIME mft, aft;
 253        int fh, rc;
 254
 255        /* must have write permission */
 256        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 257                return -1;
 258
 259        time_t_to_filetime(times->modtime, &mft);
 260        time_t_to_filetime(times->actime, &aft);
 261        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 262                errno = EINVAL;
 263                rc = -1;
 264        } else
 265                rc = 0;
 266        close(fh);
 267        return rc;
 268}
 269
 270unsigned int sleep (unsigned int seconds)
 271{
 272        Sleep(seconds*1000);
 273        return 0;
 274}
 275
 276int mkstemp(char *template)
 277{
 278        char *filename = mktemp(template);
 279        if (filename == NULL)
 280                return -1;
 281        return open(filename, O_RDWR | O_CREAT, 0600);
 282}
 283
 284int gettimeofday(struct timeval *tv, void *tz)
 285{
 286        SYSTEMTIME st;
 287        struct tm tm;
 288        GetSystemTime(&st);
 289        tm.tm_year = st.wYear-1900;
 290        tm.tm_mon = st.wMonth-1;
 291        tm.tm_mday = st.wDay;
 292        tm.tm_hour = st.wHour;
 293        tm.tm_min = st.wMinute;
 294        tm.tm_sec = st.wSecond;
 295        tv->tv_sec = tm_to_time_t(&tm);
 296        if (tv->tv_sec < 0)
 297                return -1;
 298        tv->tv_usec = st.wMilliseconds*1000;
 299        return 0;
 300}
 301
 302int pipe(int filedes[2])
 303{
 304        int fd;
 305        HANDLE h[2], parent;
 306
 307        if (_pipe(filedes, 8192, 0) < 0)
 308                return -1;
 309
 310        parent = GetCurrentProcess();
 311
 312        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 313                        parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 314                close(filedes[0]);
 315                close(filedes[1]);
 316                return -1;
 317        }
 318        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 319                        parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 320                close(filedes[0]);
 321                close(filedes[1]);
 322                CloseHandle(h[0]);
 323                return -1;
 324        }
 325        fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 326        if (fd < 0) {
 327                close(filedes[0]);
 328                close(filedes[1]);
 329                CloseHandle(h[0]);
 330                CloseHandle(h[1]);
 331                return -1;
 332        }
 333        close(filedes[0]);
 334        filedes[0] = fd;
 335        fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 336        if (fd < 0) {
 337                close(filedes[0]);
 338                close(filedes[1]);
 339                CloseHandle(h[1]);
 340                return -1;
 341        }
 342        close(filedes[1]);
 343        filedes[1] = fd;
 344        return 0;
 345}
 346
 347int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 348{
 349        int i, pending;
 350
 351        if (timeout >= 0) {
 352                if (nfds == 0) {
 353                        Sleep(timeout);
 354                        return 0;
 355                }
 356                return errno = EINVAL, error("poll timeout not supported");
 357        }
 358
 359        /* When there is only one fd to wait for, then we pretend that
 360         * input is available and let the actual wait happen when the
 361         * caller invokes read().
 362         */
 363        if (nfds == 1) {
 364                if (!(ufds[0].events & POLLIN))
 365                        return errno = EINVAL, error("POLLIN not set");
 366                ufds[0].revents = POLLIN;
 367                return 0;
 368        }
 369
 370repeat:
 371        pending = 0;
 372        for (i = 0; i < nfds; i++) {
 373                DWORD avail = 0;
 374                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 375                if (h == INVALID_HANDLE_VALUE)
 376                        return -1;      /* errno was set */
 377
 378                if (!(ufds[i].events & POLLIN))
 379                        return errno = EINVAL, error("POLLIN not set");
 380
 381                /* this emulation works only for pipes */
 382                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 383                        int err = GetLastError();
 384                        if (err == ERROR_BROKEN_PIPE) {
 385                                ufds[i].revents = POLLHUP;
 386                                pending++;
 387                        } else {
 388                                errno = EINVAL;
 389                                return error("PeekNamedPipe failed,"
 390                                        " GetLastError: %u", err);
 391                        }
 392                } else if (avail) {
 393                        ufds[i].revents = POLLIN;
 394                        pending++;
 395                } else
 396                        ufds[i].revents = 0;
 397        }
 398        if (!pending) {
 399                /* The only times that we spin here is when the process
 400                 * that is connected through the pipes is waiting for
 401                 * its own input data to become available. But since
 402                 * the process (pack-objects) is itself CPU intensive,
 403                 * it will happily pick up the time slice that we are
 404                 * relinquishing here.
 405                 */
 406                Sleep(0);
 407                goto repeat;
 408        }
 409        return 0;
 410}
 411
 412struct tm *gmtime_r(const time_t *timep, struct tm *result)
 413{
 414        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 415        memcpy(result, gmtime(timep), sizeof(struct tm));
 416        return result;
 417}
 418
 419struct tm *localtime_r(const time_t *timep, struct tm *result)
 420{
 421        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 422        memcpy(result, localtime(timep), sizeof(struct tm));
 423        return result;
 424}
 425
 426#undef getcwd
 427char *mingw_getcwd(char *pointer, int len)
 428{
 429        int i;
 430        char *ret = getcwd(pointer, len);
 431        if (!ret)
 432                return ret;
 433        for (i = 0; pointer[i]; i++)
 434                if (pointer[i] == '\\')
 435                        pointer[i] = '/';
 436        return ret;
 437}
 438
 439#undef getenv
 440char *mingw_getenv(const char *name)
 441{
 442        char *result = getenv(name);
 443        if (!result && !strcmp(name, "TMPDIR")) {
 444                /* on Windows it is TMP and TEMP */
 445                result = getenv("TMP");
 446                if (!result)
 447                        result = getenv("TEMP");
 448        }
 449        return result;
 450}
 451
 452/*
 453 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 454 * (Parsing C++ Command-Line Arguments)
 455 */
 456static const char *quote_arg(const char *arg)
 457{
 458        /* count chars to quote */
 459        int len = 0, n = 0;
 460        int force_quotes = 0;
 461        char *q, *d;
 462        const char *p = arg;
 463        if (!*p) force_quotes = 1;
 464        while (*p) {
 465                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 466                        force_quotes = 1;
 467                else if (*p == '"')
 468                        n++;
 469                else if (*p == '\\') {
 470                        int count = 0;
 471                        while (*p == '\\') {
 472                                count++;
 473                                p++;
 474                                len++;
 475                        }
 476                        if (*p == '"')
 477                                n += count*2 + 1;
 478                        continue;
 479                }
 480                len++;
 481                p++;
 482        }
 483        if (!force_quotes && n == 0)
 484                return arg;
 485
 486        /* insert \ where necessary */
 487        d = q = xmalloc(len+n+3);
 488        *d++ = '"';
 489        while (*arg) {
 490                if (*arg == '"')
 491                        *d++ = '\\';
 492                else if (*arg == '\\') {
 493                        int count = 0;
 494                        while (*arg == '\\') {
 495                                count++;
 496                                *d++ = *arg++;
 497                        }
 498                        if (*arg == '"') {
 499                                while (count-- > 0)
 500                                        *d++ = '\\';
 501                                *d++ = '\\';
 502                        }
 503                }
 504                *d++ = *arg++;
 505        }
 506        *d++ = '"';
 507        *d++ = 0;
 508        return q;
 509}
 510
 511static const char *parse_interpreter(const char *cmd)
 512{
 513        static char buf[100];
 514        char *p, *opt;
 515        int n, fd;
 516
 517        /* don't even try a .exe */
 518        n = strlen(cmd);
 519        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 520                return NULL;
 521
 522        fd = open(cmd, O_RDONLY);
 523        if (fd < 0)
 524                return NULL;
 525        n = read(fd, buf, sizeof(buf)-1);
 526        close(fd);
 527        if (n < 4)      /* at least '#!/x' and not error */
 528                return NULL;
 529
 530        if (buf[0] != '#' || buf[1] != '!')
 531                return NULL;
 532        buf[n] = '\0';
 533        p = buf + strcspn(buf, "\r\n");
 534        if (!*p)
 535                return NULL;
 536
 537        *p = '\0';
 538        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 539                return NULL;
 540        /* strip options */
 541        if ((opt = strchr(p+1, ' ')))
 542                *opt = '\0';
 543        return p+1;
 544}
 545
 546/*
 547 * Splits the PATH into parts.
 548 */
 549static char **get_path_split(void)
 550{
 551        char *p, **path, *envpath = getenv("PATH");
 552        int i, n = 0;
 553
 554        if (!envpath || !*envpath)
 555                return NULL;
 556
 557        envpath = xstrdup(envpath);
 558        p = envpath;
 559        while (p) {
 560                char *dir = p;
 561                p = strchr(p, ';');
 562                if (p) *p++ = '\0';
 563                if (*dir) {     /* not earlier, catches series of ; */
 564                        ++n;
 565                }
 566        }
 567        if (!n)
 568                return NULL;
 569
 570        path = xmalloc((n+1)*sizeof(char *));
 571        p = envpath;
 572        i = 0;
 573        do {
 574                if (*p)
 575                        path[i++] = xstrdup(p);
 576                p = p+strlen(p)+1;
 577        } while (i < n);
 578        path[i] = NULL;
 579
 580        free(envpath);
 581
 582        return path;
 583}
 584
 585static void free_path_split(char **path)
 586{
 587        char **p = path;
 588
 589        if (!path)
 590                return;
 591
 592        while (*p)
 593                free(*p++);
 594        free(path);
 595}
 596
 597/*
 598 * exe_only means that we only want to detect .exe files, but not scripts
 599 * (which do not have an extension)
 600 */
 601static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 602{
 603        char path[MAX_PATH];
 604        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 605
 606        if (!isexe && access(path, F_OK) == 0)
 607                return xstrdup(path);
 608        path[strlen(path)-4] = '\0';
 609        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 610                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 611                        return xstrdup(path);
 612        return NULL;
 613}
 614
 615/*
 616 * Determines the absolute path of cmd using the the split path in path.
 617 * If cmd contains a slash or backslash, no lookup is performed.
 618 */
 619static char *path_lookup(const char *cmd, char **path, int exe_only)
 620{
 621        char *prog = NULL;
 622        int len = strlen(cmd);
 623        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 624
 625        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 626                prog = xstrdup(cmd);
 627
 628        while (!prog && *path)
 629                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 630
 631        return prog;
 632}
 633
 634static int env_compare(const void *a, const void *b)
 635{
 636        char *const *ea = a;
 637        char *const *eb = b;
 638        return strcasecmp(*ea, *eb);
 639}
 640
 641static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 642                           int prepend_cmd)
 643{
 644        STARTUPINFO si;
 645        PROCESS_INFORMATION pi;
 646        struct strbuf envblk, args;
 647        unsigned flags;
 648        BOOL ret;
 649
 650        /* Determine whether or not we are associated to a console */
 651        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 652                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 653                        FILE_ATTRIBUTE_NORMAL, NULL);
 654        if (cons == INVALID_HANDLE_VALUE) {
 655                /* There is no console associated with this process.
 656                 * Since the child is a console process, Windows
 657                 * would normally create a console window. But
 658                 * since we'll be redirecting std streams, we do
 659                 * not need the console.
 660                 * It is necessary to use DETACHED_PROCESS
 661                 * instead of CREATE_NO_WINDOW to make ssh
 662                 * recognize that it has no console.
 663                 */
 664                flags = DETACHED_PROCESS;
 665        } else {
 666                /* There is already a console. If we specified
 667                 * DETACHED_PROCESS here, too, Windows would
 668                 * disassociate the child from the console.
 669                 * The same is true for CREATE_NO_WINDOW.
 670                 * Go figure!
 671                 */
 672                flags = 0;
 673                CloseHandle(cons);
 674        }
 675        memset(&si, 0, sizeof(si));
 676        si.cb = sizeof(si);
 677        si.dwFlags = STARTF_USESTDHANDLES;
 678        si.hStdInput = (HANDLE) _get_osfhandle(0);
 679        si.hStdOutput = (HANDLE) _get_osfhandle(1);
 680        si.hStdError = (HANDLE) _get_osfhandle(2);
 681
 682        /* concatenate argv, quoting args as we go */
 683        strbuf_init(&args, 0);
 684        if (prepend_cmd) {
 685                char *quoted = (char *)quote_arg(cmd);
 686                strbuf_addstr(&args, quoted);
 687                if (quoted != cmd)
 688                        free(quoted);
 689        }
 690        for (; *argv; argv++) {
 691                char *quoted = (char *)quote_arg(*argv);
 692                if (*args.buf)
 693                        strbuf_addch(&args, ' ');
 694                strbuf_addstr(&args, quoted);
 695                if (quoted != *argv)
 696                        free(quoted);
 697        }
 698
 699        if (env) {
 700                int count = 0;
 701                char **e, **sorted_env;
 702
 703                for (e = env; *e; e++)
 704                        count++;
 705
 706                /* environment must be sorted */
 707                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 708                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 709                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 710
 711                strbuf_init(&envblk, 0);
 712                for (e = sorted_env; *e; e++) {
 713                        strbuf_addstr(&envblk, *e);
 714                        strbuf_addch(&envblk, '\0');
 715                }
 716                free(sorted_env);
 717        }
 718
 719        memset(&pi, 0, sizeof(pi));
 720        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 721                env ? envblk.buf : NULL, NULL, &si, &pi);
 722
 723        if (env)
 724                strbuf_release(&envblk);
 725        strbuf_release(&args);
 726
 727        if (!ret) {
 728                errno = ENOENT;
 729                return -1;
 730        }
 731        CloseHandle(pi.hThread);
 732        return (pid_t)pi.hProcess;
 733}
 734
 735pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 736{
 737        pid_t pid;
 738        char **path = get_path_split();
 739        char *prog = path_lookup(cmd, path, 0);
 740
 741        if (!prog) {
 742                errno = ENOENT;
 743                pid = -1;
 744        }
 745        else {
 746                const char *interpr = parse_interpreter(prog);
 747
 748                if (interpr) {
 749                        const char *argv0 = argv[0];
 750                        char *iprog = path_lookup(interpr, path, 1);
 751                        argv[0] = prog;
 752                        if (!iprog) {
 753                                errno = ENOENT;
 754                                pid = -1;
 755                        }
 756                        else {
 757                                pid = mingw_spawnve(iprog, argv, env, 1);
 758                                free(iprog);
 759                        }
 760                        argv[0] = argv0;
 761                }
 762                else
 763                        pid = mingw_spawnve(prog, argv, env, 0);
 764                free(prog);
 765        }
 766        free_path_split(path);
 767        return pid;
 768}
 769
 770static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 771{
 772        const char *interpr = parse_interpreter(cmd);
 773        char **path;
 774        char *prog;
 775        int pid = 0;
 776
 777        if (!interpr)
 778                return 0;
 779        path = get_path_split();
 780        prog = path_lookup(interpr, path, 1);
 781        if (prog) {
 782                int argc = 0;
 783                const char **argv2;
 784                while (argv[argc]) argc++;
 785                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 786                argv2[0] = (char *)cmd; /* full path to the script file */
 787                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 788                pid = mingw_spawnve(prog, argv2, env, 1);
 789                if (pid >= 0) {
 790                        int status;
 791                        if (waitpid(pid, &status, 0) < 0)
 792                                status = 255;
 793                        exit(status);
 794                }
 795                pid = 1;        /* indicate that we tried but failed */
 796                free(prog);
 797                free(argv2);
 798        }
 799        free_path_split(path);
 800        return pid;
 801}
 802
 803static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 804{
 805        /* check if git_command is a shell script */
 806        if (!try_shell_exec(cmd, argv, (char **)env)) {
 807                int pid, status;
 808
 809                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 810                if (pid < 0)
 811                        return;
 812                if (waitpid(pid, &status, 0) < 0)
 813                        status = 255;
 814                exit(status);
 815        }
 816}
 817
 818void mingw_execvp(const char *cmd, char *const *argv)
 819{
 820        char **path = get_path_split();
 821        char *prog = path_lookup(cmd, path, 0);
 822
 823        if (prog) {
 824                mingw_execve(prog, argv, environ);
 825                free(prog);
 826        } else
 827                errno = ENOENT;
 828
 829        free_path_split(path);
 830}
 831
 832static char **copy_environ(void)
 833{
 834        char **env;
 835        int i = 0;
 836        while (environ[i])
 837                i++;
 838        env = xmalloc((i+1)*sizeof(*env));
 839        for (i = 0; environ[i]; i++)
 840                env[i] = xstrdup(environ[i]);
 841        env[i] = NULL;
 842        return env;
 843}
 844
 845void free_environ(char **env)
 846{
 847        int i;
 848        for (i = 0; env[i]; i++)
 849                free(env[i]);
 850        free(env);
 851}
 852
 853static int lookup_env(char **env, const char *name, size_t nmln)
 854{
 855        int i;
 856
 857        for (i = 0; env[i]; i++) {
 858                if (0 == strncmp(env[i], name, nmln)
 859                    && '=' == env[i][nmln])
 860                        /* matches */
 861                        return i;
 862        }
 863        return -1;
 864}
 865
 866/*
 867 * If name contains '=', then sets the variable, otherwise it unsets it
 868 */
 869static char **env_setenv(char **env, const char *name)
 870{
 871        char *eq = strchrnul(name, '=');
 872        int i = lookup_env(env, name, eq-name);
 873
 874        if (i < 0) {
 875                if (*eq) {
 876                        for (i = 0; env[i]; i++)
 877                                ;
 878                        env = xrealloc(env, (i+2)*sizeof(*env));
 879                        env[i] = xstrdup(name);
 880                        env[i+1] = NULL;
 881                }
 882        }
 883        else {
 884                free(env[i]);
 885                if (*eq)
 886                        env[i] = xstrdup(name);
 887                else
 888                        for (; env[i]; i++)
 889                                env[i] = env[i+1];
 890        }
 891        return env;
 892}
 893
 894/*
 895 * Copies global environ and adjusts variables as specified by vars.
 896 */
 897char **make_augmented_environ(const char *const *vars)
 898{
 899        char **env = copy_environ();
 900
 901        while (*vars)
 902                env = env_setenv(env, *vars++);
 903        return env;
 904}
 905
 906/* this is the first function to call into WS_32; initialize it */
 907#undef gethostbyname
 908struct hostent *mingw_gethostbyname(const char *host)
 909{
 910        WSADATA wsa;
 911
 912        if (WSAStartup(MAKEWORD(2,2), &wsa))
 913                die("unable to initialize winsock subsystem, error %d",
 914                        WSAGetLastError());
 915        atexit((void(*)(void)) WSACleanup);
 916        return gethostbyname(host);
 917}
 918
 919int mingw_socket(int domain, int type, int protocol)
 920{
 921        int sockfd;
 922        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 923        if (s == INVALID_SOCKET) {
 924                /*
 925                 * WSAGetLastError() values are regular BSD error codes
 926                 * biased by WSABASEERR.
 927                 * However, strerror() does not know about networking
 928                 * specific errors, which are values beginning at 38 or so.
 929                 * Therefore, we choose to leave the biased error code
 930                 * in errno so that _if_ someone looks up the code somewhere,
 931                 * then it is at least the number that are usually listed.
 932                 */
 933                errno = WSAGetLastError();
 934                return -1;
 935        }
 936        /* convert into a file descriptor */
 937        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 938                closesocket(s);
 939                return error("unable to make a socket file descriptor: %s",
 940                        strerror(errno));
 941        }
 942        return sockfd;
 943}
 944
 945#undef connect
 946int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 947{
 948        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 949        return connect(s, sa, sz);
 950}
 951
 952#undef rename
 953int mingw_rename(const char *pold, const char *pnew)
 954{
 955        DWORD attrs, gle;
 956        int tries = 0;
 957        static const int delay[] = { 0, 1, 10, 20, 40 };
 958
 959        /*
 960         * Try native rename() first to get errno right.
 961         * It is based on MoveFile(), which cannot overwrite existing files.
 962         */
 963        if (!rename(pold, pnew))
 964                return 0;
 965        if (errno != EEXIST)
 966                return -1;
 967repeat:
 968        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 969                return 0;
 970        /* TODO: translate more errors */
 971        gle = GetLastError();
 972        if (gle == ERROR_ACCESS_DENIED &&
 973            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
 974                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
 975                        errno = EISDIR;
 976                        return -1;
 977                }
 978                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
 979                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
 980                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 981                                return 0;
 982                        gle = GetLastError();
 983                        /* revert file attributes on failure */
 984                        SetFileAttributes(pnew, attrs);
 985                }
 986        }
 987        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
 988                /*
 989                 * We assume that some other process had the source or
 990                 * destination file open at the wrong moment and retry.
 991                 * In order to give the other process a higher chance to
 992                 * complete its operation, we give up our time slice now.
 993                 * If we have to retry again, we do sleep a bit.
 994                 */
 995                Sleep(delay[tries]);
 996                tries++;
 997                goto repeat;
 998        }
 999        errno = EACCES;
1000        return -1;
1001}
1002
1003struct passwd *getpwuid(int uid)
1004{
1005        static char user_name[100];
1006        static struct passwd p;
1007
1008        DWORD len = sizeof(user_name);
1009        if (!GetUserName(user_name, &len))
1010                return NULL;
1011        p.pw_name = user_name;
1012        p.pw_gecos = "unknown";
1013        p.pw_dir = NULL;
1014        return &p;
1015}
1016
1017static HANDLE timer_event;
1018static HANDLE timer_thread;
1019static int timer_interval;
1020static int one_shot;
1021static sig_handler_t timer_fn = SIG_DFL;
1022
1023/* The timer works like this:
1024 * The thread, ticktack(), is a trivial routine that most of the time
1025 * only waits to receive the signal to terminate. The main thread tells
1026 * the thread to terminate by setting the timer_event to the signalled
1027 * state.
1028 * But ticktack() interrupts the wait state after the timer's interval
1029 * length to call the signal handler.
1030 */
1031
1032static unsigned __stdcall ticktack(void *dummy)
1033{
1034        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1035                if (timer_fn == SIG_DFL)
1036                        die("Alarm");
1037                if (timer_fn != SIG_IGN)
1038                        timer_fn(SIGALRM);
1039                if (one_shot)
1040                        break;
1041        }
1042        return 0;
1043}
1044
1045static int start_timer_thread(void)
1046{
1047        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1048        if (timer_event) {
1049                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1050                if (!timer_thread )
1051                        return errno = ENOMEM,
1052                                error("cannot start timer thread");
1053        } else
1054                return errno = ENOMEM,
1055                        error("cannot allocate resources for timer");
1056        return 0;
1057}
1058
1059static void stop_timer_thread(void)
1060{
1061        if (timer_event)
1062                SetEvent(timer_event);  /* tell thread to terminate */
1063        if (timer_thread) {
1064                int rc = WaitForSingleObject(timer_thread, 1000);
1065                if (rc == WAIT_TIMEOUT)
1066                        error("timer thread did not terminate timely");
1067                else if (rc != WAIT_OBJECT_0)
1068                        error("waiting for timer thread failed: %lu",
1069                              GetLastError());
1070                CloseHandle(timer_thread);
1071        }
1072        if (timer_event)
1073                CloseHandle(timer_event);
1074        timer_event = NULL;
1075        timer_thread = NULL;
1076}
1077
1078static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1079{
1080        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1081}
1082
1083int setitimer(int type, struct itimerval *in, struct itimerval *out)
1084{
1085        static const struct timeval zero;
1086        static int atexit_done;
1087
1088        if (out != NULL)
1089                return errno = EINVAL,
1090                        error("setitimer param 3 != NULL not implemented");
1091        if (!is_timeval_eq(&in->it_interval, &zero) &&
1092            !is_timeval_eq(&in->it_interval, &in->it_value))
1093                return errno = EINVAL,
1094                        error("setitimer: it_interval must be zero or eq it_value");
1095
1096        if (timer_thread)
1097                stop_timer_thread();
1098
1099        if (is_timeval_eq(&in->it_value, &zero) &&
1100            is_timeval_eq(&in->it_interval, &zero))
1101                return 0;
1102
1103        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1104        one_shot = is_timeval_eq(&in->it_interval, &zero);
1105        if (!atexit_done) {
1106                atexit(stop_timer_thread);
1107                atexit_done = 1;
1108        }
1109        return start_timer_thread();
1110}
1111
1112int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1113{
1114        if (sig != SIGALRM)
1115                return errno = EINVAL,
1116                        error("sigaction only implemented for SIGALRM");
1117        if (out != NULL)
1118                return errno = EINVAL,
1119                        error("sigaction: param 3 != NULL not implemented");
1120
1121        timer_fn = in->sa_handler;
1122        return 0;
1123}
1124
1125#undef signal
1126sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1127{
1128        sig_handler_t old = timer_fn;
1129        if (sig != SIGALRM)
1130                return signal(sig, handler);
1131        timer_fn = handler;
1132        return old;
1133}
1134
1135static const char *make_backslash_path(const char *path)
1136{
1137        static char buf[PATH_MAX + 1];
1138        char *c;
1139
1140        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1141                die("Too long path: %.*s", 60, path);
1142
1143        for (c = buf; *c; c++) {
1144                if (*c == '/')
1145                        *c = '\\';
1146        }
1147        return buf;
1148}
1149
1150void mingw_open_html(const char *unixpath)
1151{
1152        const char *htmlpath = make_backslash_path(unixpath);
1153        printf("Launching default browser to display HTML ...\n");
1154        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1155}
1156
1157int link(const char *oldpath, const char *newpath)
1158{
1159        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1160        static T create_hard_link = NULL;
1161        if (!create_hard_link) {
1162                create_hard_link = (T) GetProcAddress(
1163                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1164                if (!create_hard_link)
1165                        create_hard_link = (T)-1;
1166        }
1167        if (create_hard_link == (T)-1) {
1168                errno = ENOSYS;
1169                return -1;
1170        }
1171        if (!create_hard_link(newpath, oldpath, NULL)) {
1172                errno = err_win_to_posix(GetLastError());
1173                return -1;
1174        }
1175        return 0;
1176}
1177
1178char *getpass(const char *prompt)
1179{
1180        struct strbuf buf = STRBUF_INIT;
1181
1182        fputs(prompt, stderr);
1183        for (;;) {
1184                char c = _getch();
1185                if (c == '\r' || c == '\n')
1186                        break;
1187                strbuf_addch(&buf, c);
1188        }
1189        fputs("\n", stderr);
1190        return strbuf_detach(&buf, NULL);
1191}
1192
1193#ifndef NO_MINGW_REPLACE_READDIR
1194/* MinGW readdir implementation to avoid extra lstats for Git */
1195struct mingw_DIR
1196{
1197        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1198        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1199        long                    dd_handle;      /* _findnext handle */
1200        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1201        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1202};
1203
1204struct dirent *mingw_readdir(DIR *dir)
1205{
1206        WIN32_FIND_DATAA buf;
1207        HANDLE handle;
1208        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1209
1210        if (!dir->dd_handle) {
1211                errno = EBADF; /* No set_errno for mingw */
1212                return NULL;
1213        }
1214
1215        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1216        {
1217                DWORD lasterr;
1218                handle = FindFirstFileA(dir->dd_name, &buf);
1219                lasterr = GetLastError();
1220                dir->dd_handle = (long)handle;
1221                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1222                        errno = err_win_to_posix(lasterr);
1223                        return NULL;
1224                }
1225        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1226                return NULL;
1227        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1228                DWORD lasterr = GetLastError();
1229                FindClose((HANDLE)dir->dd_handle);
1230                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1231                /* POSIX says you shouldn't set errno when readdir can't
1232                   find any more files; so, if another error we leave it set. */
1233                if (lasterr != ERROR_NO_MORE_FILES)
1234                        errno = err_win_to_posix(lasterr);
1235                return NULL;
1236        }
1237
1238        /* We get here if `buf' contains valid data.  */
1239        strcpy(dir->dd_dir.d_name, buf.cFileName);
1240        ++dir->dd_stat;
1241
1242        /* Set file type, based on WIN32_FIND_DATA */
1243        mdir->dd_dir.d_type = 0;
1244        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1245                mdir->dd_dir.d_type |= DT_DIR;
1246        else
1247                mdir->dd_dir.d_type |= DT_REG;
1248
1249        return (struct dirent*)&dir->dd_dir;
1250}
1251#endif // !NO_MINGW_REPLACE_READDIR