Andrew's git / gitweb.git / compat/mingw.c
?
compat / mingw.con commit Merge branch 'jc/checkout-detached' (25666af)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6int err_win_to_posix(DWORD winerr)
   7{
   8        int error = ENOSYS;
   9        switch(winerr) {
  10        case ERROR_ACCESS_DENIED: error = EACCES; break;
  11        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16        case ERROR_BAD_COMMAND: error = EIO; break;
  17        case ERROR_BAD_DEVICE: error = ENODEV; break;
  18        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21        case ERROR_BAD_LENGTH: error = EINVAL; break;
  22        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23        case ERROR_BAD_PIPE: error = EPIPE; break;
  24        case ERROR_BAD_UNIT: error = ENODEV; break;
  25        case ERROR_BAD_USERNAME: error = EINVAL; break;
  26        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28        case ERROR_BUSY: error = EBUSY; break;
  29        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31        case ERROR_CANNOT_MAKE: error = EACCES; break;
  32        case ERROR_CANTOPEN: error = EIO; break;
  33        case ERROR_CANTREAD: error = EIO; break;
  34        case ERROR_CANTWRITE: error = EIO; break;
  35        case ERROR_CRC: error = EIO; break;
  36        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39        case ERROR_DIRECTORY: error = EINVAL; break;
  40        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41        case ERROR_DISK_CHANGE: error = EIO; break;
  42        case ERROR_DISK_FULL: error = ENOSPC; break;
  43        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47        case ERROR_FILE_EXISTS: error = EEXIST; break;
  48        case ERROR_FILE_INVALID: error = ENODEV; break;
  49        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50        case ERROR_GEN_FAILURE: error = EIO; break;
  51        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53        case ERROR_INVALID_ACCESS: error = EACCES; break;
  54        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56        case ERROR_INVALID_DATA: error = EINVAL; break;
  57        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61        case ERROR_INVALID_HANDLE: error = EBADF; break;
  62        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63        case ERROR_INVALID_NAME: error = EINVAL; break;
  64        case ERROR_INVALID_OWNER: error = EINVAL; break;
  65        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71        case ERROR_IO_DEVICE: error = EIO; break;
  72        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73        case ERROR_LOCKED: error = EBUSY; break;
  74        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75        case ERROR_LOGON_FAILURE: error = EACCES; break;
  76        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78        case ERROR_MORE_DATA: error = EPIPE; break;
  79        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80        case ERROR_NOACCESS: error = EFAULT; break;
  81        case ERROR_NONE_MAPPED: error = EINVAL; break;
  82        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83        case ERROR_NOT_READY: error = EAGAIN; break;
  84        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85        case ERROR_NO_DATA: error = EPIPE; break;
  86        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89        case ERROR_OPEN_FAILED: error = EIO; break;
  90        case ERROR_OPEN_FILES: error = EBUSY; break;
  91        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94        case ERROR_PATH_BUSY: error = EBUSY; break;
  95        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96        case ERROR_PIPE_BUSY: error = EBUSY; break;
  97        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98        case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101        case ERROR_READ_FAULT: error = EIO; break;
 102        case ERROR_SEEK: error = EIO; break;
 103        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107        case ERROR_SWAPERROR: error = ENOENT; break;
 108        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113        case ERROR_WRITE_FAULT: error = EIO; break;
 114        case ERROR_WRITE_PROTECT: error = EROFS; break;
 115        }
 116        return error;
 117}
 118
 119#undef open
 120int mingw_open (const char *filename, int oflags, ...)
 121{
 122        va_list args;
 123        unsigned mode;
 124        int fd;
 125
 126        va_start(args, oflags);
 127        mode = va_arg(args, int);
 128        va_end(args);
 129
 130        if (!strcmp(filename, "/dev/null"))
 131                filename = "nul";
 132
 133        fd = open(filename, oflags, mode);
 134
 135        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                DWORD attrs = GetFileAttributes(filename);
 137                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                        errno = EISDIR;
 139        }
 140        return fd;
 141}
 142
 143/*
 144 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 145 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 146 */
 147static inline long long filetime_to_hnsec(const FILETIME *ft)
 148{
 149        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 150        /* Windows to Unix Epoch conversion */
 151        return winTime - 116444736000000000LL;
 152}
 153
 154static inline time_t filetime_to_time_t(const FILETIME *ft)
 155{
 156        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 157}
 158
 159/* We keep the do_lstat code in a separate function to avoid recursion.
 160 * When a path ends with a slash, the stat will fail with ENOENT. In
 161 * this case, we strip the trailing slashes and stat again.
 162 */
 163static int do_lstat(const char *file_name, struct stat *buf)
 164{
 165        WIN32_FILE_ATTRIBUTE_DATA fdata;
 166
 167        if (!(errno = get_file_attr(file_name, &fdata))) {
 168                buf->st_ino = 0;
 169                buf->st_gid = 0;
 170                buf->st_uid = 0;
 171                buf->st_nlink = 1;
 172                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 173                buf->st_size = fdata.nFileSizeLow |
 174                        (((off_t)fdata.nFileSizeHigh)<<32);
 175                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 176                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 177                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 178                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 179                return 0;
 180        }
 181        return -1;
 182}
 183
 184/* We provide our own lstat/fstat functions, since the provided
 185 * lstat/fstat functions are so slow. These stat functions are
 186 * tailored for Git's usage (read: fast), and are not meant to be
 187 * complete. Note that Git stat()s are redirected to mingw_lstat()
 188 * too, since Windows doesn't really handle symlinks that well.
 189 */
 190int mingw_lstat(const char *file_name, struct stat *buf)
 191{
 192        int namelen;
 193        static char alt_name[PATH_MAX];
 194
 195        if (!do_lstat(file_name, buf))
 196                return 0;
 197
 198        /* if file_name ended in a '/', Windows returned ENOENT;
 199         * try again without trailing slashes
 200         */
 201        if (errno != ENOENT)
 202                return -1;
 203
 204        namelen = strlen(file_name);
 205        if (namelen && file_name[namelen-1] != '/')
 206                return -1;
 207        while (namelen && file_name[namelen-1] == '/')
 208                --namelen;
 209        if (!namelen || namelen >= PATH_MAX)
 210                return -1;
 211
 212        memcpy(alt_name, file_name, namelen);
 213        alt_name[namelen] = 0;
 214        return do_lstat(alt_name, buf);
 215}
 216
 217#undef fstat
 218int mingw_fstat(int fd, struct stat *buf)
 219{
 220        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 221        BY_HANDLE_FILE_INFORMATION fdata;
 222
 223        if (fh == INVALID_HANDLE_VALUE) {
 224                errno = EBADF;
 225                return -1;
 226        }
 227        /* direct non-file handles to MS's fstat() */
 228        if (GetFileType(fh) != FILE_TYPE_DISK)
 229                return _fstati64(fd, buf);
 230
 231        if (GetFileInformationByHandle(fh, &fdata)) {
 232                buf->st_ino = 0;
 233                buf->st_gid = 0;
 234                buf->st_uid = 0;
 235                buf->st_nlink = 1;
 236                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 237                buf->st_size = fdata.nFileSizeLow |
 238                        (((off_t)fdata.nFileSizeHigh)<<32);
 239                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 240                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 241                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 242                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 243                return 0;
 244        }
 245        errno = EBADF;
 246        return -1;
 247}
 248
 249static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 250{
 251        long long winTime = t * 10000000LL + 116444736000000000LL;
 252        ft->dwLowDateTime = winTime;
 253        ft->dwHighDateTime = winTime >> 32;
 254}
 255
 256int mingw_utime (const char *file_name, const struct utimbuf *times)
 257{
 258        FILETIME mft, aft;
 259        int fh, rc;
 260
 261        /* must have write permission */
 262        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 263                return -1;
 264
 265        time_t_to_filetime(times->modtime, &mft);
 266        time_t_to_filetime(times->actime, &aft);
 267        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 268                errno = EINVAL;
 269                rc = -1;
 270        } else
 271                rc = 0;
 272        close(fh);
 273        return rc;
 274}
 275
 276unsigned int sleep (unsigned int seconds)
 277{
 278        Sleep(seconds*1000);
 279        return 0;
 280}
 281
 282int mkstemp(char *template)
 283{
 284        char *filename = mktemp(template);
 285        if (filename == NULL)
 286                return -1;
 287        return open(filename, O_RDWR | O_CREAT, 0600);
 288}
 289
 290int gettimeofday(struct timeval *tv, void *tz)
 291{
 292        FILETIME ft;
 293        long long hnsec;
 294
 295        GetSystemTimeAsFileTime(&ft);
 296        hnsec = filetime_to_hnsec(&ft);
 297        tv->tv_sec = hnsec / 10000000;
 298        tv->tv_usec = (hnsec % 10000000) / 10;
 299        return 0;
 300}
 301
 302int pipe(int filedes[2])
 303{
 304        HANDLE h[2];
 305
 306        /* this creates non-inheritable handles */
 307        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 308                errno = err_win_to_posix(GetLastError());
 309                return -1;
 310        }
 311        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 312        if (filedes[0] < 0) {
 313                CloseHandle(h[0]);
 314                CloseHandle(h[1]);
 315                return -1;
 316        }
 317        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 318        if (filedes[0] < 0) {
 319                close(filedes[0]);
 320                CloseHandle(h[1]);
 321                return -1;
 322        }
 323        return 0;
 324}
 325
 326int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 327{
 328        int i, pending;
 329
 330        if (timeout >= 0) {
 331                if (nfds == 0) {
 332                        Sleep(timeout);
 333                        return 0;
 334                }
 335                return errno = EINVAL, error("poll timeout not supported");
 336        }
 337
 338        /* When there is only one fd to wait for, then we pretend that
 339         * input is available and let the actual wait happen when the
 340         * caller invokes read().
 341         */
 342        if (nfds == 1) {
 343                if (!(ufds[0].events & POLLIN))
 344                        return errno = EINVAL, error("POLLIN not set");
 345                ufds[0].revents = POLLIN;
 346                return 0;
 347        }
 348
 349repeat:
 350        pending = 0;
 351        for (i = 0; i < nfds; i++) {
 352                DWORD avail = 0;
 353                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 354                if (h == INVALID_HANDLE_VALUE)
 355                        return -1;      /* errno was set */
 356
 357                if (!(ufds[i].events & POLLIN))
 358                        return errno = EINVAL, error("POLLIN not set");
 359
 360                /* this emulation works only for pipes */
 361                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 362                        int err = GetLastError();
 363                        if (err == ERROR_BROKEN_PIPE) {
 364                                ufds[i].revents = POLLHUP;
 365                                pending++;
 366                        } else {
 367                                errno = EINVAL;
 368                                return error("PeekNamedPipe failed,"
 369                                        " GetLastError: %u", err);
 370                        }
 371                } else if (avail) {
 372                        ufds[i].revents = POLLIN;
 373                        pending++;
 374                } else
 375                        ufds[i].revents = 0;
 376        }
 377        if (!pending) {
 378                /* The only times that we spin here is when the process
 379                 * that is connected through the pipes is waiting for
 380                 * its own input data to become available. But since
 381                 * the process (pack-objects) is itself CPU intensive,
 382                 * it will happily pick up the time slice that we are
 383                 * relinquishing here.
 384                 */
 385                Sleep(0);
 386                goto repeat;
 387        }
 388        return 0;
 389}
 390
 391struct tm *gmtime_r(const time_t *timep, struct tm *result)
 392{
 393        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 394        memcpy(result, gmtime(timep), sizeof(struct tm));
 395        return result;
 396}
 397
 398struct tm *localtime_r(const time_t *timep, struct tm *result)
 399{
 400        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 401        memcpy(result, localtime(timep), sizeof(struct tm));
 402        return result;
 403}
 404
 405#undef getcwd
 406char *mingw_getcwd(char *pointer, int len)
 407{
 408        int i;
 409        char *ret = getcwd(pointer, len);
 410        if (!ret)
 411                return ret;
 412        for (i = 0; pointer[i]; i++)
 413                if (pointer[i] == '\\')
 414                        pointer[i] = '/';
 415        return ret;
 416}
 417
 418#undef getenv
 419char *mingw_getenv(const char *name)
 420{
 421        char *result = getenv(name);
 422        if (!result && !strcmp(name, "TMPDIR")) {
 423                /* on Windows it is TMP and TEMP */
 424                result = getenv("TMP");
 425                if (!result)
 426                        result = getenv("TEMP");
 427        }
 428        return result;
 429}
 430
 431/*
 432 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 433 * (Parsing C++ Command-Line Arguments)
 434 */
 435static const char *quote_arg(const char *arg)
 436{
 437        /* count chars to quote */
 438        int len = 0, n = 0;
 439        int force_quotes = 0;
 440        char *q, *d;
 441        const char *p = arg;
 442        if (!*p) force_quotes = 1;
 443        while (*p) {
 444                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 445                        force_quotes = 1;
 446                else if (*p == '"')
 447                        n++;
 448                else if (*p == '\\') {
 449                        int count = 0;
 450                        while (*p == '\\') {
 451                                count++;
 452                                p++;
 453                                len++;
 454                        }
 455                        if (*p == '"')
 456                                n += count*2 + 1;
 457                        continue;
 458                }
 459                len++;
 460                p++;
 461        }
 462        if (!force_quotes && n == 0)
 463                return arg;
 464
 465        /* insert \ where necessary */
 466        d = q = xmalloc(len+n+3);
 467        *d++ = '"';
 468        while (*arg) {
 469                if (*arg == '"')
 470                        *d++ = '\\';
 471                else if (*arg == '\\') {
 472                        int count = 0;
 473                        while (*arg == '\\') {
 474                                count++;
 475                                *d++ = *arg++;
 476                        }
 477                        if (*arg == '"') {
 478                                while (count-- > 0)
 479                                        *d++ = '\\';
 480                                *d++ = '\\';
 481                        }
 482                }
 483                *d++ = *arg++;
 484        }
 485        *d++ = '"';
 486        *d++ = 0;
 487        return q;
 488}
 489
 490static const char *parse_interpreter(const char *cmd)
 491{
 492        static char buf[100];
 493        char *p, *opt;
 494        int n, fd;
 495
 496        /* don't even try a .exe */
 497        n = strlen(cmd);
 498        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 499                return NULL;
 500
 501        fd = open(cmd, O_RDONLY);
 502        if (fd < 0)
 503                return NULL;
 504        n = read(fd, buf, sizeof(buf)-1);
 505        close(fd);
 506        if (n < 4)      /* at least '#!/x' and not error */
 507                return NULL;
 508
 509        if (buf[0] != '#' || buf[1] != '!')
 510                return NULL;
 511        buf[n] = '\0';
 512        p = buf + strcspn(buf, "\r\n");
 513        if (!*p)
 514                return NULL;
 515
 516        *p = '\0';
 517        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 518                return NULL;
 519        /* strip options */
 520        if ((opt = strchr(p+1, ' ')))
 521                *opt = '\0';
 522        return p+1;
 523}
 524
 525/*
 526 * Splits the PATH into parts.
 527 */
 528static char **get_path_split(void)
 529{
 530        char *p, **path, *envpath = getenv("PATH");
 531        int i, n = 0;
 532
 533        if (!envpath || !*envpath)
 534                return NULL;
 535
 536        envpath = xstrdup(envpath);
 537        p = envpath;
 538        while (p) {
 539                char *dir = p;
 540                p = strchr(p, ';');
 541                if (p) *p++ = '\0';
 542                if (*dir) {     /* not earlier, catches series of ; */
 543                        ++n;
 544                }
 545        }
 546        if (!n)
 547                return NULL;
 548
 549        path = xmalloc((n+1)*sizeof(char *));
 550        p = envpath;
 551        i = 0;
 552        do {
 553                if (*p)
 554                        path[i++] = xstrdup(p);
 555                p = p+strlen(p)+1;
 556        } while (i < n);
 557        path[i] = NULL;
 558
 559        free(envpath);
 560
 561        return path;
 562}
 563
 564static void free_path_split(char **path)
 565{
 566        char **p = path;
 567
 568        if (!path)
 569                return;
 570
 571        while (*p)
 572                free(*p++);
 573        free(path);
 574}
 575
 576/*
 577 * exe_only means that we only want to detect .exe files, but not scripts
 578 * (which do not have an extension)
 579 */
 580static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 581{
 582        char path[MAX_PATH];
 583        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 584
 585        if (!isexe && access(path, F_OK) == 0)
 586                return xstrdup(path);
 587        path[strlen(path)-4] = '\0';
 588        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 589                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 590                        return xstrdup(path);
 591        return NULL;
 592}
 593
 594/*
 595 * Determines the absolute path of cmd using the the split path in path.
 596 * If cmd contains a slash or backslash, no lookup is performed.
 597 */
 598static char *path_lookup(const char *cmd, char **path, int exe_only)
 599{
 600        char *prog = NULL;
 601        int len = strlen(cmd);
 602        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 603
 604        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 605                prog = xstrdup(cmd);
 606
 607        while (!prog && *path)
 608                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 609
 610        return prog;
 611}
 612
 613static int env_compare(const void *a, const void *b)
 614{
 615        char *const *ea = a;
 616        char *const *eb = b;
 617        return strcasecmp(*ea, *eb);
 618}
 619
 620static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 621                              int prepend_cmd, int fhin, int fhout, int fherr)
 622{
 623        STARTUPINFO si;
 624        PROCESS_INFORMATION pi;
 625        struct strbuf envblk, args;
 626        unsigned flags;
 627        BOOL ret;
 628
 629        /* Determine whether or not we are associated to a console */
 630        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 631                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 632                        FILE_ATTRIBUTE_NORMAL, NULL);
 633        if (cons == INVALID_HANDLE_VALUE) {
 634                /* There is no console associated with this process.
 635                 * Since the child is a console process, Windows
 636                 * would normally create a console window. But
 637                 * since we'll be redirecting std streams, we do
 638                 * not need the console.
 639                 * It is necessary to use DETACHED_PROCESS
 640                 * instead of CREATE_NO_WINDOW to make ssh
 641                 * recognize that it has no console.
 642                 */
 643                flags = DETACHED_PROCESS;
 644        } else {
 645                /* There is already a console. If we specified
 646                 * DETACHED_PROCESS here, too, Windows would
 647                 * disassociate the child from the console.
 648                 * The same is true for CREATE_NO_WINDOW.
 649                 * Go figure!
 650                 */
 651                flags = 0;
 652                CloseHandle(cons);
 653        }
 654        memset(&si, 0, sizeof(si));
 655        si.cb = sizeof(si);
 656        si.dwFlags = STARTF_USESTDHANDLES;
 657        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 658        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 659        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 660
 661        /* concatenate argv, quoting args as we go */
 662        strbuf_init(&args, 0);
 663        if (prepend_cmd) {
 664                char *quoted = (char *)quote_arg(cmd);
 665                strbuf_addstr(&args, quoted);
 666                if (quoted != cmd)
 667                        free(quoted);
 668        }
 669        for (; *argv; argv++) {
 670                char *quoted = (char *)quote_arg(*argv);
 671                if (*args.buf)
 672                        strbuf_addch(&args, ' ');
 673                strbuf_addstr(&args, quoted);
 674                if (quoted != *argv)
 675                        free(quoted);
 676        }
 677
 678        if (env) {
 679                int count = 0;
 680                char **e, **sorted_env;
 681
 682                for (e = env; *e; e++)
 683                        count++;
 684
 685                /* environment must be sorted */
 686                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 687                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 688                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 689
 690                strbuf_init(&envblk, 0);
 691                for (e = sorted_env; *e; e++) {
 692                        strbuf_addstr(&envblk, *e);
 693                        strbuf_addch(&envblk, '\0');
 694                }
 695                free(sorted_env);
 696        }
 697
 698        memset(&pi, 0, sizeof(pi));
 699        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 700                env ? envblk.buf : NULL, NULL, &si, &pi);
 701
 702        if (env)
 703                strbuf_release(&envblk);
 704        strbuf_release(&args);
 705
 706        if (!ret) {
 707                errno = ENOENT;
 708                return -1;
 709        }
 710        CloseHandle(pi.hThread);
 711        return (pid_t)pi.hProcess;
 712}
 713
 714static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 715                           int prepend_cmd)
 716{
 717        return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
 718}
 719
 720pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 721                     int fhin, int fhout, int fherr)
 722{
 723        pid_t pid;
 724        char **path = get_path_split();
 725        char *prog = path_lookup(cmd, path, 0);
 726
 727        if (!prog) {
 728                errno = ENOENT;
 729                pid = -1;
 730        }
 731        else {
 732                const char *interpr = parse_interpreter(prog);
 733
 734                if (interpr) {
 735                        const char *argv0 = argv[0];
 736                        char *iprog = path_lookup(interpr, path, 1);
 737                        argv[0] = prog;
 738                        if (!iprog) {
 739                                errno = ENOENT;
 740                                pid = -1;
 741                        }
 742                        else {
 743                                pid = mingw_spawnve_fd(iprog, argv, env, 1,
 744                                                       fhin, fhout, fherr);
 745                                free(iprog);
 746                        }
 747                        argv[0] = argv0;
 748                }
 749                else
 750                        pid = mingw_spawnve_fd(prog, argv, env, 0,
 751                                               fhin, fhout, fherr);
 752                free(prog);
 753        }
 754        free_path_split(path);
 755        return pid;
 756}
 757
 758static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 759{
 760        const char *interpr = parse_interpreter(cmd);
 761        char **path;
 762        char *prog;
 763        int pid = 0;
 764
 765        if (!interpr)
 766                return 0;
 767        path = get_path_split();
 768        prog = path_lookup(interpr, path, 1);
 769        if (prog) {
 770                int argc = 0;
 771                const char **argv2;
 772                while (argv[argc]) argc++;
 773                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 774                argv2[0] = (char *)cmd; /* full path to the script file */
 775                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 776                pid = mingw_spawnve(prog, argv2, env, 1);
 777                if (pid >= 0) {
 778                        int status;
 779                        if (waitpid(pid, &status, 0) < 0)
 780                                status = 255;
 781                        exit(status);
 782                }
 783                pid = 1;        /* indicate that we tried but failed */
 784                free(prog);
 785                free(argv2);
 786        }
 787        free_path_split(path);
 788        return pid;
 789}
 790
 791static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 792{
 793        /* check if git_command is a shell script */
 794        if (!try_shell_exec(cmd, argv, (char **)env)) {
 795                int pid, status;
 796
 797                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 798                if (pid < 0)
 799                        return;
 800                if (waitpid(pid, &status, 0) < 0)
 801                        status = 255;
 802                exit(status);
 803        }
 804}
 805
 806void mingw_execvp(const char *cmd, char *const *argv)
 807{
 808        char **path = get_path_split();
 809        char *prog = path_lookup(cmd, path, 0);
 810
 811        if (prog) {
 812                mingw_execve(prog, argv, environ);
 813                free(prog);
 814        } else
 815                errno = ENOENT;
 816
 817        free_path_split(path);
 818}
 819
 820static char **copy_environ(void)
 821{
 822        char **env;
 823        int i = 0;
 824        while (environ[i])
 825                i++;
 826        env = xmalloc((i+1)*sizeof(*env));
 827        for (i = 0; environ[i]; i++)
 828                env[i] = xstrdup(environ[i]);
 829        env[i] = NULL;
 830        return env;
 831}
 832
 833void free_environ(char **env)
 834{
 835        int i;
 836        for (i = 0; env[i]; i++)
 837                free(env[i]);
 838        free(env);
 839}
 840
 841static int lookup_env(char **env, const char *name, size_t nmln)
 842{
 843        int i;
 844
 845        for (i = 0; env[i]; i++) {
 846                if (0 == strncmp(env[i], name, nmln)
 847                    && '=' == env[i][nmln])
 848                        /* matches */
 849                        return i;
 850        }
 851        return -1;
 852}
 853
 854/*
 855 * If name contains '=', then sets the variable, otherwise it unsets it
 856 */
 857static char **env_setenv(char **env, const char *name)
 858{
 859        char *eq = strchrnul(name, '=');
 860        int i = lookup_env(env, name, eq-name);
 861
 862        if (i < 0) {
 863                if (*eq) {
 864                        for (i = 0; env[i]; i++)
 865                                ;
 866                        env = xrealloc(env, (i+2)*sizeof(*env));
 867                        env[i] = xstrdup(name);
 868                        env[i+1] = NULL;
 869                }
 870        }
 871        else {
 872                free(env[i]);
 873                if (*eq)
 874                        env[i] = xstrdup(name);
 875                else
 876                        for (; env[i]; i++)
 877                                env[i] = env[i+1];
 878        }
 879        return env;
 880}
 881
 882/*
 883 * Copies global environ and adjusts variables as specified by vars.
 884 */
 885char **make_augmented_environ(const char *const *vars)
 886{
 887        char **env = copy_environ();
 888
 889        while (*vars)
 890                env = env_setenv(env, *vars++);
 891        return env;
 892}
 893
 894/*
 895 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 896 * that service contains a numerical port, or that it it is null. It
 897 * does a simple search using gethostbyname, and returns one IPv4 host
 898 * if one was found.
 899 */
 900static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 901                                   const struct addrinfo *hints,
 902                                   struct addrinfo **res)
 903{
 904        struct hostent *h = gethostbyname(node);
 905        struct addrinfo *ai;
 906        struct sockaddr_in *sin;
 907
 908        if (!h)
 909                return WSAGetLastError();
 910
 911        ai = xmalloc(sizeof(struct addrinfo));
 912        *res = ai;
 913        ai->ai_flags = 0;
 914        ai->ai_family = AF_INET;
 915        ai->ai_socktype = hints->ai_socktype;
 916        switch (hints->ai_socktype) {
 917        case SOCK_STREAM:
 918                ai->ai_protocol = IPPROTO_TCP;
 919                break;
 920        case SOCK_DGRAM:
 921                ai->ai_protocol = IPPROTO_UDP;
 922                break;
 923        default:
 924                ai->ai_protocol = 0;
 925                break;
 926        }
 927        ai->ai_addrlen = sizeof(struct sockaddr_in);
 928        ai->ai_canonname = strdup(h->h_name);
 929
 930        sin = xmalloc(ai->ai_addrlen);
 931        memset(sin, 0, ai->ai_addrlen);
 932        sin->sin_family = AF_INET;
 933        if (service)
 934                sin->sin_port = htons(atoi(service));
 935        sin->sin_addr = *(struct in_addr *)h->h_addr;
 936        ai->ai_addr = (struct sockaddr *)sin;
 937        ai->ai_next = 0;
 938        return 0;
 939}
 940
 941static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 942{
 943        free(res->ai_canonname);
 944        free(res->ai_addr);
 945        free(res);
 946}
 947
 948static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 949                                   char *host, DWORD hostlen,
 950                                   char *serv, DWORD servlen, int flags)
 951{
 952        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 953        if (sa->sa_family != AF_INET)
 954                return EAI_FAMILY;
 955        if (!host && !serv)
 956                return EAI_NONAME;
 957
 958        if (host && hostlen > 0) {
 959                struct hostent *ent = NULL;
 960                if (!(flags & NI_NUMERICHOST))
 961                        ent = gethostbyaddr((const char *)&sin->sin_addr,
 962                                            sizeof(sin->sin_addr), AF_INET);
 963
 964                if (ent)
 965                        snprintf(host, hostlen, "%s", ent->h_name);
 966                else if (flags & NI_NAMEREQD)
 967                        return EAI_NONAME;
 968                else
 969                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
 970        }
 971
 972        if (serv && servlen > 0) {
 973                struct servent *ent = NULL;
 974                if (!(flags & NI_NUMERICSERV))
 975                        ent = getservbyport(sin->sin_port,
 976                                            flags & NI_DGRAM ? "udp" : "tcp");
 977
 978                if (ent)
 979                        snprintf(serv, servlen, "%s", ent->s_name);
 980                else
 981                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 982        }
 983
 984        return 0;
 985}
 986
 987static HMODULE ipv6_dll = NULL;
 988static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
 989static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
 990                                      const struct addrinfo *hints,
 991                                      struct addrinfo **res);
 992static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
 993                                      char *host, DWORD hostlen,
 994                                      char *serv, DWORD servlen, int flags);
 995/*
 996 * gai_strerror is an inline function in the ws2tcpip.h header, so we
 997 * don't need to try to load that one dynamically.
 998 */
 999
1000static void socket_cleanup(void)
1001{
1002        WSACleanup();
1003        if (ipv6_dll)
1004                FreeLibrary(ipv6_dll);
1005        ipv6_dll = NULL;
1006        ipv6_freeaddrinfo = freeaddrinfo_stub;
1007        ipv6_getaddrinfo = getaddrinfo_stub;
1008        ipv6_getnameinfo = getnameinfo_stub;
1009}
1010
1011static void ensure_socket_initialization(void)
1012{
1013        WSADATA wsa;
1014        static int initialized = 0;
1015        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1016        const char **name;
1017
1018        if (initialized)
1019                return;
1020
1021        if (WSAStartup(MAKEWORD(2,2), &wsa))
1022                die("unable to initialize winsock subsystem, error %d",
1023                        WSAGetLastError());
1024
1025        for (name = libraries; *name; name++) {
1026                ipv6_dll = LoadLibrary(*name);
1027                if (!ipv6_dll)
1028                        continue;
1029
1030                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1031                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1032                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1033                                                   const struct addrinfo *,
1034                                                   struct addrinfo **))
1035                        GetProcAddress(ipv6_dll, "getaddrinfo");
1036                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1037                                                   socklen_t, char *, DWORD,
1038                                                   char *, DWORD, int))
1039                        GetProcAddress(ipv6_dll, "getnameinfo");
1040                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1041                        FreeLibrary(ipv6_dll);
1042                        ipv6_dll = NULL;
1043                } else
1044                        break;
1045        }
1046        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1047                ipv6_freeaddrinfo = freeaddrinfo_stub;
1048                ipv6_getaddrinfo = getaddrinfo_stub;
1049                ipv6_getnameinfo = getnameinfo_stub;
1050        }
1051
1052        atexit(socket_cleanup);
1053        initialized = 1;
1054}
1055
1056#undef gethostbyname
1057struct hostent *mingw_gethostbyname(const char *host)
1058{
1059        ensure_socket_initialization();
1060        return gethostbyname(host);
1061}
1062
1063void mingw_freeaddrinfo(struct addrinfo *res)
1064{
1065        ipv6_freeaddrinfo(res);
1066}
1067
1068int mingw_getaddrinfo(const char *node, const char *service,
1069                      const struct addrinfo *hints, struct addrinfo **res)
1070{
1071        ensure_socket_initialization();
1072        return ipv6_getaddrinfo(node, service, hints, res);
1073}
1074
1075int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1076                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1077                      int flags)
1078{
1079        ensure_socket_initialization();
1080        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1081}
1082
1083int mingw_socket(int domain, int type, int protocol)
1084{
1085        int sockfd;
1086        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1087        if (s == INVALID_SOCKET) {
1088                /*
1089                 * WSAGetLastError() values are regular BSD error codes
1090                 * biased by WSABASEERR.
1091                 * However, strerror() does not know about networking
1092                 * specific errors, which are values beginning at 38 or so.
1093                 * Therefore, we choose to leave the biased error code
1094                 * in errno so that _if_ someone looks up the code somewhere,
1095                 * then it is at least the number that are usually listed.
1096                 */
1097                errno = WSAGetLastError();
1098                return -1;
1099        }
1100        /* convert into a file descriptor */
1101        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1102                closesocket(s);
1103                return error("unable to make a socket file descriptor: %s",
1104                        strerror(errno));
1105        }
1106        return sockfd;
1107}
1108
1109#undef connect
1110int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1111{
1112        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1113        return connect(s, sa, sz);
1114}
1115
1116#undef rename
1117int mingw_rename(const char *pold, const char *pnew)
1118{
1119        DWORD attrs, gle;
1120        int tries = 0;
1121        static const int delay[] = { 0, 1, 10, 20, 40 };
1122
1123        /*
1124         * Try native rename() first to get errno right.
1125         * It is based on MoveFile(), which cannot overwrite existing files.
1126         */
1127        if (!rename(pold, pnew))
1128                return 0;
1129        if (errno != EEXIST)
1130                return -1;
1131repeat:
1132        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1133                return 0;
1134        /* TODO: translate more errors */
1135        gle = GetLastError();
1136        if (gle == ERROR_ACCESS_DENIED &&
1137            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1138                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1139                        errno = EISDIR;
1140                        return -1;
1141                }
1142                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1143                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1144                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1145                                return 0;
1146                        gle = GetLastError();
1147                        /* revert file attributes on failure */
1148                        SetFileAttributes(pnew, attrs);
1149                }
1150        }
1151        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1152                /*
1153                 * We assume that some other process had the source or
1154                 * destination file open at the wrong moment and retry.
1155                 * In order to give the other process a higher chance to
1156                 * complete its operation, we give up our time slice now.
1157                 * If we have to retry again, we do sleep a bit.
1158                 */
1159                Sleep(delay[tries]);
1160                tries++;
1161                goto repeat;
1162        }
1163        errno = EACCES;
1164        return -1;
1165}
1166
1167/*
1168 * Note that this doesn't return the actual pagesize, but
1169 * the allocation granularity. If future Windows specific git code
1170 * needs the real getpagesize function, we need to find another solution.
1171 */
1172int mingw_getpagesize(void)
1173{
1174        SYSTEM_INFO si;
1175        GetSystemInfo(&si);
1176        return si.dwAllocationGranularity;
1177}
1178
1179struct passwd *getpwuid(int uid)
1180{
1181        static char user_name[100];
1182        static struct passwd p;
1183
1184        DWORD len = sizeof(user_name);
1185        if (!GetUserName(user_name, &len))
1186                return NULL;
1187        p.pw_name = user_name;
1188        p.pw_gecos = "unknown";
1189        p.pw_dir = NULL;
1190        return &p;
1191}
1192
1193static HANDLE timer_event;
1194static HANDLE timer_thread;
1195static int timer_interval;
1196static int one_shot;
1197static sig_handler_t timer_fn = SIG_DFL;
1198
1199/* The timer works like this:
1200 * The thread, ticktack(), is a trivial routine that most of the time
1201 * only waits to receive the signal to terminate. The main thread tells
1202 * the thread to terminate by setting the timer_event to the signalled
1203 * state.
1204 * But ticktack() interrupts the wait state after the timer's interval
1205 * length to call the signal handler.
1206 */
1207
1208static unsigned __stdcall ticktack(void *dummy)
1209{
1210        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1211                if (timer_fn == SIG_DFL)
1212                        die("Alarm");
1213                if (timer_fn != SIG_IGN)
1214                        timer_fn(SIGALRM);
1215                if (one_shot)
1216                        break;
1217        }
1218        return 0;
1219}
1220
1221static int start_timer_thread(void)
1222{
1223        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1224        if (timer_event) {
1225                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1226                if (!timer_thread )
1227                        return errno = ENOMEM,
1228                                error("cannot start timer thread");
1229        } else
1230                return errno = ENOMEM,
1231                        error("cannot allocate resources for timer");
1232        return 0;
1233}
1234
1235static void stop_timer_thread(void)
1236{
1237        if (timer_event)
1238                SetEvent(timer_event);  /* tell thread to terminate */
1239        if (timer_thread) {
1240                int rc = WaitForSingleObject(timer_thread, 1000);
1241                if (rc == WAIT_TIMEOUT)
1242                        error("timer thread did not terminate timely");
1243                else if (rc != WAIT_OBJECT_0)
1244                        error("waiting for timer thread failed: %lu",
1245                              GetLastError());
1246                CloseHandle(timer_thread);
1247        }
1248        if (timer_event)
1249                CloseHandle(timer_event);
1250        timer_event = NULL;
1251        timer_thread = NULL;
1252}
1253
1254static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1255{
1256        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1257}
1258
1259int setitimer(int type, struct itimerval *in, struct itimerval *out)
1260{
1261        static const struct timeval zero;
1262        static int atexit_done;
1263
1264        if (out != NULL)
1265                return errno = EINVAL,
1266                        error("setitimer param 3 != NULL not implemented");
1267        if (!is_timeval_eq(&in->it_interval, &zero) &&
1268            !is_timeval_eq(&in->it_interval, &in->it_value))
1269                return errno = EINVAL,
1270                        error("setitimer: it_interval must be zero or eq it_value");
1271
1272        if (timer_thread)
1273                stop_timer_thread();
1274
1275        if (is_timeval_eq(&in->it_value, &zero) &&
1276            is_timeval_eq(&in->it_interval, &zero))
1277                return 0;
1278
1279        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1280        one_shot = is_timeval_eq(&in->it_interval, &zero);
1281        if (!atexit_done) {
1282                atexit(stop_timer_thread);
1283                atexit_done = 1;
1284        }
1285        return start_timer_thread();
1286}
1287
1288int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1289{
1290        if (sig != SIGALRM)
1291                return errno = EINVAL,
1292                        error("sigaction only implemented for SIGALRM");
1293        if (out != NULL)
1294                return errno = EINVAL,
1295                        error("sigaction: param 3 != NULL not implemented");
1296
1297        timer_fn = in->sa_handler;
1298        return 0;
1299}
1300
1301#undef signal
1302sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1303{
1304        sig_handler_t old = timer_fn;
1305        if (sig != SIGALRM)
1306                return signal(sig, handler);
1307        timer_fn = handler;
1308        return old;
1309}
1310
1311static const char *make_backslash_path(const char *path)
1312{
1313        static char buf[PATH_MAX + 1];
1314        char *c;
1315
1316        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1317                die("Too long path: %.*s", 60, path);
1318
1319        for (c = buf; *c; c++) {
1320                if (*c == '/')
1321                        *c = '\\';
1322        }
1323        return buf;
1324}
1325
1326void mingw_open_html(const char *unixpath)
1327{
1328        const char *htmlpath = make_backslash_path(unixpath);
1329        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1330                        const char *, const char *, const char *, INT);
1331        T ShellExecute;
1332        HMODULE shell32;
1333
1334        shell32 = LoadLibrary("shell32.dll");
1335        if (!shell32)
1336                die("cannot load shell32.dll");
1337        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1338        if (!ShellExecute)
1339                die("cannot run browser");
1340
1341        printf("Launching default browser to display HTML ...\n");
1342        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1343
1344        FreeLibrary(shell32);
1345}
1346
1347int link(const char *oldpath, const char *newpath)
1348{
1349        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1350        static T create_hard_link = NULL;
1351        if (!create_hard_link) {
1352                create_hard_link = (T) GetProcAddress(
1353                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1354                if (!create_hard_link)
1355                        create_hard_link = (T)-1;
1356        }
1357        if (create_hard_link == (T)-1) {
1358                errno = ENOSYS;
1359                return -1;
1360        }
1361        if (!create_hard_link(newpath, oldpath, NULL)) {
1362                errno = err_win_to_posix(GetLastError());
1363                return -1;
1364        }
1365        return 0;
1366}
1367
1368char *getpass(const char *prompt)
1369{
1370        struct strbuf buf = STRBUF_INIT;
1371
1372        fputs(prompt, stderr);
1373        for (;;) {
1374                char c = _getch();
1375                if (c == '\r' || c == '\n')
1376                        break;
1377                strbuf_addch(&buf, c);
1378        }
1379        fputs("\n", stderr);
1380        return strbuf_detach(&buf, NULL);
1381}
1382
1383#ifndef NO_MINGW_REPLACE_READDIR
1384/* MinGW readdir implementation to avoid extra lstats for Git */
1385struct mingw_DIR
1386{
1387        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1388        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1389        long                    dd_handle;      /* _findnext handle */
1390        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1391        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1392};
1393
1394struct dirent *mingw_readdir(DIR *dir)
1395{
1396        WIN32_FIND_DATAA buf;
1397        HANDLE handle;
1398        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1399
1400        if (!dir->dd_handle) {
1401                errno = EBADF; /* No set_errno for mingw */
1402                return NULL;
1403        }
1404
1405        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1406        {
1407                DWORD lasterr;
1408                handle = FindFirstFileA(dir->dd_name, &buf);
1409                lasterr = GetLastError();
1410                dir->dd_handle = (long)handle;
1411                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1412                        errno = err_win_to_posix(lasterr);
1413                        return NULL;
1414                }
1415        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1416                return NULL;
1417        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1418                DWORD lasterr = GetLastError();
1419                FindClose((HANDLE)dir->dd_handle);
1420                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1421                /* POSIX says you shouldn't set errno when readdir can't
1422                   find any more files; so, if another error we leave it set. */
1423                if (lasterr != ERROR_NO_MORE_FILES)
1424                        errno = err_win_to_posix(lasterr);
1425                return NULL;
1426        }
1427
1428        /* We get here if `buf' contains valid data.  */
1429        strcpy(dir->dd_dir.d_name, buf.cFileName);
1430        ++dir->dd_stat;
1431
1432        /* Set file type, based on WIN32_FIND_DATA */
1433        mdir->dd_dir.d_type = 0;
1434        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1435                mdir->dd_dir.d_type |= DT_DIR;
1436        else
1437                mdir->dd_dir.d_type |= DT_REG;
1438
1439        return (struct dirent*)&dir->dd_dir;
1440}
1441#endif // !NO_MINGW_REPLACE_READDIR