Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit revision: Turn off history simplification in --ancestry-path mode (cb7529e)
   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#undef fopen
 144FILE *mingw_fopen (const char *filename, const char *otype)
 145{
 146        if (!strcmp(filename, "/dev/null"))
 147                filename = "nul";
 148        return fopen(filename, otype);
 149}
 150
 151#undef freopen
 152FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 153{
 154        if (filename && !strcmp(filename, "/dev/null"))
 155                filename = "nul";
 156        return freopen(filename, otype, stream);
 157}
 158
 159/*
 160 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 161 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 162 */
 163static inline long long filetime_to_hnsec(const FILETIME *ft)
 164{
 165        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 166        /* Windows to Unix Epoch conversion */
 167        return winTime - 116444736000000000LL;
 168}
 169
 170static inline time_t filetime_to_time_t(const FILETIME *ft)
 171{
 172        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 173}
 174
 175/* We keep the do_lstat code in a separate function to avoid recursion.
 176 * When a path ends with a slash, the stat will fail with ENOENT. In
 177 * this case, we strip the trailing slashes and stat again.
 178 */
 179static int do_lstat(const char *file_name, struct stat *buf)
 180{
 181        WIN32_FILE_ATTRIBUTE_DATA fdata;
 182
 183        if (!(errno = get_file_attr(file_name, &fdata))) {
 184                buf->st_ino = 0;
 185                buf->st_gid = 0;
 186                buf->st_uid = 0;
 187                buf->st_nlink = 1;
 188                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 189                buf->st_size = fdata.nFileSizeLow |
 190                        (((off_t)fdata.nFileSizeHigh)<<32);
 191                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 192                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 193                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 194                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 195                return 0;
 196        }
 197        return -1;
 198}
 199
 200/* We provide our own lstat/fstat functions, since the provided
 201 * lstat/fstat functions are so slow. These stat functions are
 202 * tailored for Git's usage (read: fast), and are not meant to be
 203 * complete. Note that Git stat()s are redirected to mingw_lstat()
 204 * too, since Windows doesn't really handle symlinks that well.
 205 */
 206int mingw_lstat(const char *file_name, struct stat *buf)
 207{
 208        int namelen;
 209        static char alt_name[PATH_MAX];
 210
 211        if (!do_lstat(file_name, buf))
 212                return 0;
 213
 214        /* if file_name ended in a '/', Windows returned ENOENT;
 215         * try again without trailing slashes
 216         */
 217        if (errno != ENOENT)
 218                return -1;
 219
 220        namelen = strlen(file_name);
 221        if (namelen && file_name[namelen-1] != '/')
 222                return -1;
 223        while (namelen && file_name[namelen-1] == '/')
 224                --namelen;
 225        if (!namelen || namelen >= PATH_MAX)
 226                return -1;
 227
 228        memcpy(alt_name, file_name, namelen);
 229        alt_name[namelen] = 0;
 230        return do_lstat(alt_name, buf);
 231}
 232
 233#undef fstat
 234int mingw_fstat(int fd, struct stat *buf)
 235{
 236        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 237        BY_HANDLE_FILE_INFORMATION fdata;
 238
 239        if (fh == INVALID_HANDLE_VALUE) {
 240                errno = EBADF;
 241                return -1;
 242        }
 243        /* direct non-file handles to MS's fstat() */
 244        if (GetFileType(fh) != FILE_TYPE_DISK)
 245                return _fstati64(fd, buf);
 246
 247        if (GetFileInformationByHandle(fh, &fdata)) {
 248                buf->st_ino = 0;
 249                buf->st_gid = 0;
 250                buf->st_uid = 0;
 251                buf->st_nlink = 1;
 252                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 253                buf->st_size = fdata.nFileSizeLow |
 254                        (((off_t)fdata.nFileSizeHigh)<<32);
 255                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 256                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 257                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 258                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 259                return 0;
 260        }
 261        errno = EBADF;
 262        return -1;
 263}
 264
 265static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 266{
 267        long long winTime = t * 10000000LL + 116444736000000000LL;
 268        ft->dwLowDateTime = winTime;
 269        ft->dwHighDateTime = winTime >> 32;
 270}
 271
 272int mingw_utime (const char *file_name, const struct utimbuf *times)
 273{
 274        FILETIME mft, aft;
 275        int fh, rc;
 276
 277        /* must have write permission */
 278        DWORD attrs = GetFileAttributes(file_name);
 279        if (attrs != INVALID_FILE_ATTRIBUTES &&
 280            (attrs & FILE_ATTRIBUTE_READONLY)) {
 281                /* ignore errors here; open() will report them */
 282                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 283        }
 284
 285        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 286                rc = -1;
 287                goto revert_attrs;
 288        }
 289
 290        time_t_to_filetime(times->modtime, &mft);
 291        time_t_to_filetime(times->actime, &aft);
 292        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 293                errno = EINVAL;
 294                rc = -1;
 295        } else
 296                rc = 0;
 297        close(fh);
 298
 299revert_attrs:
 300        if (attrs != INVALID_FILE_ATTRIBUTES &&
 301            (attrs & FILE_ATTRIBUTE_READONLY)) {
 302                /* ignore errors again */
 303                SetFileAttributes(file_name, attrs);
 304        }
 305        return rc;
 306}
 307
 308unsigned int sleep (unsigned int seconds)
 309{
 310        Sleep(seconds*1000);
 311        return 0;
 312}
 313
 314int mkstemp(char *template)
 315{
 316        char *filename = mktemp(template);
 317        if (filename == NULL)
 318                return -1;
 319        return open(filename, O_RDWR | O_CREAT, 0600);
 320}
 321
 322int gettimeofday(struct timeval *tv, void *tz)
 323{
 324        FILETIME ft;
 325        long long hnsec;
 326
 327        GetSystemTimeAsFileTime(&ft);
 328        hnsec = filetime_to_hnsec(&ft);
 329        tv->tv_sec = hnsec / 10000000;
 330        tv->tv_usec = (hnsec % 10000000) / 10;
 331        return 0;
 332}
 333
 334int pipe(int filedes[2])
 335{
 336        HANDLE h[2];
 337
 338        /* this creates non-inheritable handles */
 339        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 340                errno = err_win_to_posix(GetLastError());
 341                return -1;
 342        }
 343        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 344        if (filedes[0] < 0) {
 345                CloseHandle(h[0]);
 346                CloseHandle(h[1]);
 347                return -1;
 348        }
 349        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 350        if (filedes[0] < 0) {
 351                close(filedes[0]);
 352                CloseHandle(h[1]);
 353                return -1;
 354        }
 355        return 0;
 356}
 357
 358int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 359{
 360        int i, pending;
 361
 362        if (timeout >= 0) {
 363                if (nfds == 0) {
 364                        Sleep(timeout);
 365                        return 0;
 366                }
 367                return errno = EINVAL, error("poll timeout not supported");
 368        }
 369
 370        /* When there is only one fd to wait for, then we pretend that
 371         * input is available and let the actual wait happen when the
 372         * caller invokes read().
 373         */
 374        if (nfds == 1) {
 375                if (!(ufds[0].events & POLLIN))
 376                        return errno = EINVAL, error("POLLIN not set");
 377                ufds[0].revents = POLLIN;
 378                return 0;
 379        }
 380
 381repeat:
 382        pending = 0;
 383        for (i = 0; i < nfds; i++) {
 384                DWORD avail = 0;
 385                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 386                if (h == INVALID_HANDLE_VALUE)
 387                        return -1;      /* errno was set */
 388
 389                if (!(ufds[i].events & POLLIN))
 390                        return errno = EINVAL, error("POLLIN not set");
 391
 392                /* this emulation works only for pipes */
 393                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 394                        int err = GetLastError();
 395                        if (err == ERROR_BROKEN_PIPE) {
 396                                ufds[i].revents = POLLHUP;
 397                                pending++;
 398                        } else {
 399                                errno = EINVAL;
 400                                return error("PeekNamedPipe failed,"
 401                                        " GetLastError: %u", err);
 402                        }
 403                } else if (avail) {
 404                        ufds[i].revents = POLLIN;
 405                        pending++;
 406                } else
 407                        ufds[i].revents = 0;
 408        }
 409        if (!pending) {
 410                /* The only times that we spin here is when the process
 411                 * that is connected through the pipes is waiting for
 412                 * its own input data to become available. But since
 413                 * the process (pack-objects) is itself CPU intensive,
 414                 * it will happily pick up the time slice that we are
 415                 * relinquishing here.
 416                 */
 417                Sleep(0);
 418                goto repeat;
 419        }
 420        return 0;
 421}
 422
 423struct tm *gmtime_r(const time_t *timep, struct tm *result)
 424{
 425        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 426        memcpy(result, gmtime(timep), sizeof(struct tm));
 427        return result;
 428}
 429
 430struct tm *localtime_r(const time_t *timep, struct tm *result)
 431{
 432        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 433        memcpy(result, localtime(timep), sizeof(struct tm));
 434        return result;
 435}
 436
 437#undef getcwd
 438char *mingw_getcwd(char *pointer, int len)
 439{
 440        int i;
 441        char *ret = getcwd(pointer, len);
 442        if (!ret)
 443                return ret;
 444        for (i = 0; pointer[i]; i++)
 445                if (pointer[i] == '\\')
 446                        pointer[i] = '/';
 447        return ret;
 448}
 449
 450#undef getenv
 451char *mingw_getenv(const char *name)
 452{
 453        char *result = getenv(name);
 454        if (!result && !strcmp(name, "TMPDIR")) {
 455                /* on Windows it is TMP and TEMP */
 456                result = getenv("TMP");
 457                if (!result)
 458                        result = getenv("TEMP");
 459        }
 460        return result;
 461}
 462
 463/*
 464 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 465 * (Parsing C++ Command-Line Arguments)
 466 */
 467static const char *quote_arg(const char *arg)
 468{
 469        /* count chars to quote */
 470        int len = 0, n = 0;
 471        int force_quotes = 0;
 472        char *q, *d;
 473        const char *p = arg;
 474        if (!*p) force_quotes = 1;
 475        while (*p) {
 476                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 477                        force_quotes = 1;
 478                else if (*p == '"')
 479                        n++;
 480                else if (*p == '\\') {
 481                        int count = 0;
 482                        while (*p == '\\') {
 483                                count++;
 484                                p++;
 485                                len++;
 486                        }
 487                        if (*p == '"')
 488                                n += count*2 + 1;
 489                        continue;
 490                }
 491                len++;
 492                p++;
 493        }
 494        if (!force_quotes && n == 0)
 495                return arg;
 496
 497        /* insert \ where necessary */
 498        d = q = xmalloc(len+n+3);
 499        *d++ = '"';
 500        while (*arg) {
 501                if (*arg == '"')
 502                        *d++ = '\\';
 503                else if (*arg == '\\') {
 504                        int count = 0;
 505                        while (*arg == '\\') {
 506                                count++;
 507                                *d++ = *arg++;
 508                        }
 509                        if (*arg == '"') {
 510                                while (count-- > 0)
 511                                        *d++ = '\\';
 512                                *d++ = '\\';
 513                        }
 514                }
 515                *d++ = *arg++;
 516        }
 517        *d++ = '"';
 518        *d++ = 0;
 519        return q;
 520}
 521
 522static const char *parse_interpreter(const char *cmd)
 523{
 524        static char buf[100];
 525        char *p, *opt;
 526        int n, fd;
 527
 528        /* don't even try a .exe */
 529        n = strlen(cmd);
 530        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 531                return NULL;
 532
 533        fd = open(cmd, O_RDONLY);
 534        if (fd < 0)
 535                return NULL;
 536        n = read(fd, buf, sizeof(buf)-1);
 537        close(fd);
 538        if (n < 4)      /* at least '#!/x' and not error */
 539                return NULL;
 540
 541        if (buf[0] != '#' || buf[1] != '!')
 542                return NULL;
 543        buf[n] = '\0';
 544        p = buf + strcspn(buf, "\r\n");
 545        if (!*p)
 546                return NULL;
 547
 548        *p = '\0';
 549        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 550                return NULL;
 551        /* strip options */
 552        if ((opt = strchr(p+1, ' ')))
 553                *opt = '\0';
 554        return p+1;
 555}
 556
 557/*
 558 * Splits the PATH into parts.
 559 */
 560static char **get_path_split(void)
 561{
 562        char *p, **path, *envpath = getenv("PATH");
 563        int i, n = 0;
 564
 565        if (!envpath || !*envpath)
 566                return NULL;
 567
 568        envpath = xstrdup(envpath);
 569        p = envpath;
 570        while (p) {
 571                char *dir = p;
 572                p = strchr(p, ';');
 573                if (p) *p++ = '\0';
 574                if (*dir) {     /* not earlier, catches series of ; */
 575                        ++n;
 576                }
 577        }
 578        if (!n)
 579                return NULL;
 580
 581        path = xmalloc((n+1)*sizeof(char *));
 582        p = envpath;
 583        i = 0;
 584        do {
 585                if (*p)
 586                        path[i++] = xstrdup(p);
 587                p = p+strlen(p)+1;
 588        } while (i < n);
 589        path[i] = NULL;
 590
 591        free(envpath);
 592
 593        return path;
 594}
 595
 596static void free_path_split(char **path)
 597{
 598        char **p = path;
 599
 600        if (!path)
 601                return;
 602
 603        while (*p)
 604                free(*p++);
 605        free(path);
 606}
 607
 608/*
 609 * exe_only means that we only want to detect .exe files, but not scripts
 610 * (which do not have an extension)
 611 */
 612static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 613{
 614        char path[MAX_PATH];
 615        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 616
 617        if (!isexe && access(path, F_OK) == 0)
 618                return xstrdup(path);
 619        path[strlen(path)-4] = '\0';
 620        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 621                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 622                        return xstrdup(path);
 623        return NULL;
 624}
 625
 626/*
 627 * Determines the absolute path of cmd using the the split path in path.
 628 * If cmd contains a slash or backslash, no lookup is performed.
 629 */
 630static char *path_lookup(const char *cmd, char **path, int exe_only)
 631{
 632        char *prog = NULL;
 633        int len = strlen(cmd);
 634        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 635
 636        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 637                prog = xstrdup(cmd);
 638
 639        while (!prog && *path)
 640                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 641
 642        return prog;
 643}
 644
 645static int env_compare(const void *a, const void *b)
 646{
 647        char *const *ea = a;
 648        char *const *eb = b;
 649        return strcasecmp(*ea, *eb);
 650}
 651
 652static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 653                              const char *dir,
 654                              int prepend_cmd, int fhin, int fhout, int fherr)
 655{
 656        STARTUPINFO si;
 657        PROCESS_INFORMATION pi;
 658        struct strbuf envblk, args;
 659        unsigned flags;
 660        BOOL ret;
 661
 662        /* Determine whether or not we are associated to a console */
 663        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 664                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 665                        FILE_ATTRIBUTE_NORMAL, NULL);
 666        if (cons == INVALID_HANDLE_VALUE) {
 667                /* There is no console associated with this process.
 668                 * Since the child is a console process, Windows
 669                 * would normally create a console window. But
 670                 * since we'll be redirecting std streams, we do
 671                 * not need the console.
 672                 * It is necessary to use DETACHED_PROCESS
 673                 * instead of CREATE_NO_WINDOW to make ssh
 674                 * recognize that it has no console.
 675                 */
 676                flags = DETACHED_PROCESS;
 677        } else {
 678                /* There is already a console. If we specified
 679                 * DETACHED_PROCESS here, too, Windows would
 680                 * disassociate the child from the console.
 681                 * The same is true for CREATE_NO_WINDOW.
 682                 * Go figure!
 683                 */
 684                flags = 0;
 685                CloseHandle(cons);
 686        }
 687        memset(&si, 0, sizeof(si));
 688        si.cb = sizeof(si);
 689        si.dwFlags = STARTF_USESTDHANDLES;
 690        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 691        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 692        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 693
 694        /* concatenate argv, quoting args as we go */
 695        strbuf_init(&args, 0);
 696        if (prepend_cmd) {
 697                char *quoted = (char *)quote_arg(cmd);
 698                strbuf_addstr(&args, quoted);
 699                if (quoted != cmd)
 700                        free(quoted);
 701        }
 702        for (; *argv; argv++) {
 703                char *quoted = (char *)quote_arg(*argv);
 704                if (*args.buf)
 705                        strbuf_addch(&args, ' ');
 706                strbuf_addstr(&args, quoted);
 707                if (quoted != *argv)
 708                        free(quoted);
 709        }
 710
 711        if (env) {
 712                int count = 0;
 713                char **e, **sorted_env;
 714
 715                for (e = env; *e; e++)
 716                        count++;
 717
 718                /* environment must be sorted */
 719                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 720                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 721                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 722
 723                strbuf_init(&envblk, 0);
 724                for (e = sorted_env; *e; e++) {
 725                        strbuf_addstr(&envblk, *e);
 726                        strbuf_addch(&envblk, '\0');
 727                }
 728                free(sorted_env);
 729        }
 730
 731        memset(&pi, 0, sizeof(pi));
 732        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 733                env ? envblk.buf : NULL, dir, &si, &pi);
 734
 735        if (env)
 736                strbuf_release(&envblk);
 737        strbuf_release(&args);
 738
 739        if (!ret) {
 740                errno = ENOENT;
 741                return -1;
 742        }
 743        CloseHandle(pi.hThread);
 744        return (pid_t)pi.hProcess;
 745}
 746
 747static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 748                           int prepend_cmd)
 749{
 750        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 751}
 752
 753pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 754                     const char *dir,
 755                     int fhin, int fhout, int fherr)
 756{
 757        pid_t pid;
 758        char **path = get_path_split();
 759        char *prog = path_lookup(cmd, path, 0);
 760
 761        if (!prog) {
 762                errno = ENOENT;
 763                pid = -1;
 764        }
 765        else {
 766                const char *interpr = parse_interpreter(prog);
 767
 768                if (interpr) {
 769                        const char *argv0 = argv[0];
 770                        char *iprog = path_lookup(interpr, path, 1);
 771                        argv[0] = prog;
 772                        if (!iprog) {
 773                                errno = ENOENT;
 774                                pid = -1;
 775                        }
 776                        else {
 777                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 778                                                       fhin, fhout, fherr);
 779                                free(iprog);
 780                        }
 781                        argv[0] = argv0;
 782                }
 783                else
 784                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 785                                               fhin, fhout, fherr);
 786                free(prog);
 787        }
 788        free_path_split(path);
 789        return pid;
 790}
 791
 792static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 793{
 794        const char *interpr = parse_interpreter(cmd);
 795        char **path;
 796        char *prog;
 797        int pid = 0;
 798
 799        if (!interpr)
 800                return 0;
 801        path = get_path_split();
 802        prog = path_lookup(interpr, path, 1);
 803        if (prog) {
 804                int argc = 0;
 805                const char **argv2;
 806                while (argv[argc]) argc++;
 807                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 808                argv2[0] = (char *)cmd; /* full path to the script file */
 809                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 810                pid = mingw_spawnve(prog, argv2, env, 1);
 811                if (pid >= 0) {
 812                        int status;
 813                        if (waitpid(pid, &status, 0) < 0)
 814                                status = 255;
 815                        exit(status);
 816                }
 817                pid = 1;        /* indicate that we tried but failed */
 818                free(prog);
 819                free(argv2);
 820        }
 821        free_path_split(path);
 822        return pid;
 823}
 824
 825static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 826{
 827        /* check if git_command is a shell script */
 828        if (!try_shell_exec(cmd, argv, (char **)env)) {
 829                int pid, status;
 830
 831                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 832                if (pid < 0)
 833                        return;
 834                if (waitpid(pid, &status, 0) < 0)
 835                        status = 255;
 836                exit(status);
 837        }
 838}
 839
 840void mingw_execvp(const char *cmd, char *const *argv)
 841{
 842        char **path = get_path_split();
 843        char *prog = path_lookup(cmd, path, 0);
 844
 845        if (prog) {
 846                mingw_execve(prog, argv, environ);
 847                free(prog);
 848        } else
 849                errno = ENOENT;
 850
 851        free_path_split(path);
 852}
 853
 854static char **copy_environ(void)
 855{
 856        char **env;
 857        int i = 0;
 858        while (environ[i])
 859                i++;
 860        env = xmalloc((i+1)*sizeof(*env));
 861        for (i = 0; environ[i]; i++)
 862                env[i] = xstrdup(environ[i]);
 863        env[i] = NULL;
 864        return env;
 865}
 866
 867void free_environ(char **env)
 868{
 869        int i;
 870        for (i = 0; env[i]; i++)
 871                free(env[i]);
 872        free(env);
 873}
 874
 875static int lookup_env(char **env, const char *name, size_t nmln)
 876{
 877        int i;
 878
 879        for (i = 0; env[i]; i++) {
 880                if (0 == strncmp(env[i], name, nmln)
 881                    && '=' == env[i][nmln])
 882                        /* matches */
 883                        return i;
 884        }
 885        return -1;
 886}
 887
 888/*
 889 * If name contains '=', then sets the variable, otherwise it unsets it
 890 */
 891static char **env_setenv(char **env, const char *name)
 892{
 893        char *eq = strchrnul(name, '=');
 894        int i = lookup_env(env, name, eq-name);
 895
 896        if (i < 0) {
 897                if (*eq) {
 898                        for (i = 0; env[i]; i++)
 899                                ;
 900                        env = xrealloc(env, (i+2)*sizeof(*env));
 901                        env[i] = xstrdup(name);
 902                        env[i+1] = NULL;
 903                }
 904        }
 905        else {
 906                free(env[i]);
 907                if (*eq)
 908                        env[i] = xstrdup(name);
 909                else
 910                        for (; env[i]; i++)
 911                                env[i] = env[i+1];
 912        }
 913        return env;
 914}
 915
 916/*
 917 * Copies global environ and adjusts variables as specified by vars.
 918 */
 919char **make_augmented_environ(const char *const *vars)
 920{
 921        char **env = copy_environ();
 922
 923        while (*vars)
 924                env = env_setenv(env, *vars++);
 925        return env;
 926}
 927
 928/*
 929 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 930 * that service contains a numerical port, or that it it is null. It
 931 * does a simple search using gethostbyname, and returns one IPv4 host
 932 * if one was found.
 933 */
 934static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 935                                   const struct addrinfo *hints,
 936                                   struct addrinfo **res)
 937{
 938        struct hostent *h = gethostbyname(node);
 939        struct addrinfo *ai;
 940        struct sockaddr_in *sin;
 941
 942        if (!h)
 943                return WSAGetLastError();
 944
 945        ai = xmalloc(sizeof(struct addrinfo));
 946        *res = ai;
 947        ai->ai_flags = 0;
 948        ai->ai_family = AF_INET;
 949        ai->ai_socktype = hints->ai_socktype;
 950        switch (hints->ai_socktype) {
 951        case SOCK_STREAM:
 952                ai->ai_protocol = IPPROTO_TCP;
 953                break;
 954        case SOCK_DGRAM:
 955                ai->ai_protocol = IPPROTO_UDP;
 956                break;
 957        default:
 958                ai->ai_protocol = 0;
 959                break;
 960        }
 961        ai->ai_addrlen = sizeof(struct sockaddr_in);
 962        ai->ai_canonname = strdup(h->h_name);
 963
 964        sin = xmalloc(ai->ai_addrlen);
 965        memset(sin, 0, ai->ai_addrlen);
 966        sin->sin_family = AF_INET;
 967        if (service)
 968                sin->sin_port = htons(atoi(service));
 969        sin->sin_addr = *(struct in_addr *)h->h_addr;
 970        ai->ai_addr = (struct sockaddr *)sin;
 971        ai->ai_next = 0;
 972        return 0;
 973}
 974
 975static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 976{
 977        free(res->ai_canonname);
 978        free(res->ai_addr);
 979        free(res);
 980}
 981
 982static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 983                                   char *host, DWORD hostlen,
 984                                   char *serv, DWORD servlen, int flags)
 985{
 986        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 987        if (sa->sa_family != AF_INET)
 988                return EAI_FAMILY;
 989        if (!host && !serv)
 990                return EAI_NONAME;
 991
 992        if (host && hostlen > 0) {
 993                struct hostent *ent = NULL;
 994                if (!(flags & NI_NUMERICHOST))
 995                        ent = gethostbyaddr((const char *)&sin->sin_addr,
 996                                            sizeof(sin->sin_addr), AF_INET);
 997
 998                if (ent)
 999                        snprintf(host, hostlen, "%s", ent->h_name);
1000                else if (flags & NI_NAMEREQD)
1001                        return EAI_NONAME;
1002                else
1003                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1004        }
1005
1006        if (serv && servlen > 0) {
1007                struct servent *ent = NULL;
1008                if (!(flags & NI_NUMERICSERV))
1009                        ent = getservbyport(sin->sin_port,
1010                                            flags & NI_DGRAM ? "udp" : "tcp");
1011
1012                if (ent)
1013                        snprintf(serv, servlen, "%s", ent->s_name);
1014                else
1015                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1016        }
1017
1018        return 0;
1019}
1020
1021static HMODULE ipv6_dll = NULL;
1022static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1023static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1024                                      const struct addrinfo *hints,
1025                                      struct addrinfo **res);
1026static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1027                                      char *host, DWORD hostlen,
1028                                      char *serv, DWORD servlen, int flags);
1029/*
1030 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1031 * don't need to try to load that one dynamically.
1032 */
1033
1034static void socket_cleanup(void)
1035{
1036        WSACleanup();
1037        if (ipv6_dll)
1038                FreeLibrary(ipv6_dll);
1039        ipv6_dll = NULL;
1040        ipv6_freeaddrinfo = freeaddrinfo_stub;
1041        ipv6_getaddrinfo = getaddrinfo_stub;
1042        ipv6_getnameinfo = getnameinfo_stub;
1043}
1044
1045static void ensure_socket_initialization(void)
1046{
1047        WSADATA wsa;
1048        static int initialized = 0;
1049        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1050        const char **name;
1051
1052        if (initialized)
1053                return;
1054
1055        if (WSAStartup(MAKEWORD(2,2), &wsa))
1056                die("unable to initialize winsock subsystem, error %d",
1057                        WSAGetLastError());
1058
1059        for (name = libraries; *name; name++) {
1060                ipv6_dll = LoadLibrary(*name);
1061                if (!ipv6_dll)
1062                        continue;
1063
1064                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1065                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1066                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1067                                                   const struct addrinfo *,
1068                                                   struct addrinfo **))
1069                        GetProcAddress(ipv6_dll, "getaddrinfo");
1070                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1071                                                   socklen_t, char *, DWORD,
1072                                                   char *, DWORD, int))
1073                        GetProcAddress(ipv6_dll, "getnameinfo");
1074                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1075                        FreeLibrary(ipv6_dll);
1076                        ipv6_dll = NULL;
1077                } else
1078                        break;
1079        }
1080        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1081                ipv6_freeaddrinfo = freeaddrinfo_stub;
1082                ipv6_getaddrinfo = getaddrinfo_stub;
1083                ipv6_getnameinfo = getnameinfo_stub;
1084        }
1085
1086        atexit(socket_cleanup);
1087        initialized = 1;
1088}
1089
1090#undef gethostbyname
1091struct hostent *mingw_gethostbyname(const char *host)
1092{
1093        ensure_socket_initialization();
1094        return gethostbyname(host);
1095}
1096
1097void mingw_freeaddrinfo(struct addrinfo *res)
1098{
1099        ipv6_freeaddrinfo(res);
1100}
1101
1102int mingw_getaddrinfo(const char *node, const char *service,
1103                      const struct addrinfo *hints, struct addrinfo **res)
1104{
1105        ensure_socket_initialization();
1106        return ipv6_getaddrinfo(node, service, hints, res);
1107}
1108
1109int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1110                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1111                      int flags)
1112{
1113        ensure_socket_initialization();
1114        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1115}
1116
1117int mingw_socket(int domain, int type, int protocol)
1118{
1119        int sockfd;
1120        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1121        if (s == INVALID_SOCKET) {
1122                /*
1123                 * WSAGetLastError() values are regular BSD error codes
1124                 * biased by WSABASEERR.
1125                 * However, strerror() does not know about networking
1126                 * specific errors, which are values beginning at 38 or so.
1127                 * Therefore, we choose to leave the biased error code
1128                 * in errno so that _if_ someone looks up the code somewhere,
1129                 * then it is at least the number that are usually listed.
1130                 */
1131                errno = WSAGetLastError();
1132                return -1;
1133        }
1134        /* convert into a file descriptor */
1135        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1136                closesocket(s);
1137                return error("unable to make a socket file descriptor: %s",
1138                        strerror(errno));
1139        }
1140        return sockfd;
1141}
1142
1143#undef connect
1144int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1145{
1146        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1147        return connect(s, sa, sz);
1148}
1149
1150#undef rename
1151int mingw_rename(const char *pold, const char *pnew)
1152{
1153        DWORD attrs, gle;
1154        int tries = 0;
1155        static const int delay[] = { 0, 1, 10, 20, 40 };
1156
1157        /*
1158         * Try native rename() first to get errno right.
1159         * It is based on MoveFile(), which cannot overwrite existing files.
1160         */
1161        if (!rename(pold, pnew))
1162                return 0;
1163        if (errno != EEXIST)
1164                return -1;
1165repeat:
1166        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1167                return 0;
1168        /* TODO: translate more errors */
1169        gle = GetLastError();
1170        if (gle == ERROR_ACCESS_DENIED &&
1171            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1172                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1173                        errno = EISDIR;
1174                        return -1;
1175                }
1176                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1177                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1178                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1179                                return 0;
1180                        gle = GetLastError();
1181                        /* revert file attributes on failure */
1182                        SetFileAttributes(pnew, attrs);
1183                }
1184        }
1185        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1186                /*
1187                 * We assume that some other process had the source or
1188                 * destination file open at the wrong moment and retry.
1189                 * In order to give the other process a higher chance to
1190                 * complete its operation, we give up our time slice now.
1191                 * If we have to retry again, we do sleep a bit.
1192                 */
1193                Sleep(delay[tries]);
1194                tries++;
1195                goto repeat;
1196        }
1197        errno = EACCES;
1198        return -1;
1199}
1200
1201/*
1202 * Note that this doesn't return the actual pagesize, but
1203 * the allocation granularity. If future Windows specific git code
1204 * needs the real getpagesize function, we need to find another solution.
1205 */
1206int mingw_getpagesize(void)
1207{
1208        SYSTEM_INFO si;
1209        GetSystemInfo(&si);
1210        return si.dwAllocationGranularity;
1211}
1212
1213struct passwd *getpwuid(int uid)
1214{
1215        static char user_name[100];
1216        static struct passwd p;
1217
1218        DWORD len = sizeof(user_name);
1219        if (!GetUserName(user_name, &len))
1220                return NULL;
1221        p.pw_name = user_name;
1222        p.pw_gecos = "unknown";
1223        p.pw_dir = NULL;
1224        return &p;
1225}
1226
1227static HANDLE timer_event;
1228static HANDLE timer_thread;
1229static int timer_interval;
1230static int one_shot;
1231static sig_handler_t timer_fn = SIG_DFL;
1232
1233/* The timer works like this:
1234 * The thread, ticktack(), is a trivial routine that most of the time
1235 * only waits to receive the signal to terminate. The main thread tells
1236 * the thread to terminate by setting the timer_event to the signalled
1237 * state.
1238 * But ticktack() interrupts the wait state after the timer's interval
1239 * length to call the signal handler.
1240 */
1241
1242static unsigned __stdcall ticktack(void *dummy)
1243{
1244        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1245                if (timer_fn == SIG_DFL)
1246                        die("Alarm");
1247                if (timer_fn != SIG_IGN)
1248                        timer_fn(SIGALRM);
1249                if (one_shot)
1250                        break;
1251        }
1252        return 0;
1253}
1254
1255static int start_timer_thread(void)
1256{
1257        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1258        if (timer_event) {
1259                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1260                if (!timer_thread )
1261                        return errno = ENOMEM,
1262                                error("cannot start timer thread");
1263        } else
1264                return errno = ENOMEM,
1265                        error("cannot allocate resources for timer");
1266        return 0;
1267}
1268
1269static void stop_timer_thread(void)
1270{
1271        if (timer_event)
1272                SetEvent(timer_event);  /* tell thread to terminate */
1273        if (timer_thread) {
1274                int rc = WaitForSingleObject(timer_thread, 1000);
1275                if (rc == WAIT_TIMEOUT)
1276                        error("timer thread did not terminate timely");
1277                else if (rc != WAIT_OBJECT_0)
1278                        error("waiting for timer thread failed: %lu",
1279                              GetLastError());
1280                CloseHandle(timer_thread);
1281        }
1282        if (timer_event)
1283                CloseHandle(timer_event);
1284        timer_event = NULL;
1285        timer_thread = NULL;
1286}
1287
1288static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1289{
1290        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1291}
1292
1293int setitimer(int type, struct itimerval *in, struct itimerval *out)
1294{
1295        static const struct timeval zero;
1296        static int atexit_done;
1297
1298        if (out != NULL)
1299                return errno = EINVAL,
1300                        error("setitimer param 3 != NULL not implemented");
1301        if (!is_timeval_eq(&in->it_interval, &zero) &&
1302            !is_timeval_eq(&in->it_interval, &in->it_value))
1303                return errno = EINVAL,
1304                        error("setitimer: it_interval must be zero or eq it_value");
1305
1306        if (timer_thread)
1307                stop_timer_thread();
1308
1309        if (is_timeval_eq(&in->it_value, &zero) &&
1310            is_timeval_eq(&in->it_interval, &zero))
1311                return 0;
1312
1313        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1314        one_shot = is_timeval_eq(&in->it_interval, &zero);
1315        if (!atexit_done) {
1316                atexit(stop_timer_thread);
1317                atexit_done = 1;
1318        }
1319        return start_timer_thread();
1320}
1321
1322int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1323{
1324        if (sig != SIGALRM)
1325                return errno = EINVAL,
1326                        error("sigaction only implemented for SIGALRM");
1327        if (out != NULL)
1328                return errno = EINVAL,
1329                        error("sigaction: param 3 != NULL not implemented");
1330
1331        timer_fn = in->sa_handler;
1332        return 0;
1333}
1334
1335#undef signal
1336sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1337{
1338        sig_handler_t old = timer_fn;
1339        if (sig != SIGALRM)
1340                return signal(sig, handler);
1341        timer_fn = handler;
1342        return old;
1343}
1344
1345static const char *make_backslash_path(const char *path)
1346{
1347        static char buf[PATH_MAX + 1];
1348        char *c;
1349
1350        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1351                die("Too long path: %.*s", 60, path);
1352
1353        for (c = buf; *c; c++) {
1354                if (*c == '/')
1355                        *c = '\\';
1356        }
1357        return buf;
1358}
1359
1360void mingw_open_html(const char *unixpath)
1361{
1362        const char *htmlpath = make_backslash_path(unixpath);
1363        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1364                        const char *, const char *, const char *, INT);
1365        T ShellExecute;
1366        HMODULE shell32;
1367
1368        shell32 = LoadLibrary("shell32.dll");
1369        if (!shell32)
1370                die("cannot load shell32.dll");
1371        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1372        if (!ShellExecute)
1373                die("cannot run browser");
1374
1375        printf("Launching default browser to display HTML ...\n");
1376        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1377
1378        FreeLibrary(shell32);
1379}
1380
1381int link(const char *oldpath, const char *newpath)
1382{
1383        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1384        static T create_hard_link = NULL;
1385        if (!create_hard_link) {
1386                create_hard_link = (T) GetProcAddress(
1387                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1388                if (!create_hard_link)
1389                        create_hard_link = (T)-1;
1390        }
1391        if (create_hard_link == (T)-1) {
1392                errno = ENOSYS;
1393                return -1;
1394        }
1395        if (!create_hard_link(newpath, oldpath, NULL)) {
1396                errno = err_win_to_posix(GetLastError());
1397                return -1;
1398        }
1399        return 0;
1400}
1401
1402char *getpass(const char *prompt)
1403{
1404        struct strbuf buf = STRBUF_INIT;
1405
1406        fputs(prompt, stderr);
1407        for (;;) {
1408                char c = _getch();
1409                if (c == '\r' || c == '\n')
1410                        break;
1411                strbuf_addch(&buf, c);
1412        }
1413        fputs("\n", stderr);
1414        return strbuf_detach(&buf, NULL);
1415}
1416
1417#ifndef NO_MINGW_REPLACE_READDIR
1418/* MinGW readdir implementation to avoid extra lstats for Git */
1419struct mingw_DIR
1420{
1421        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1422        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1423        long                    dd_handle;      /* _findnext handle */
1424        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1425        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1426};
1427
1428struct dirent *mingw_readdir(DIR *dir)
1429{
1430        WIN32_FIND_DATAA buf;
1431        HANDLE handle;
1432        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1433
1434        if (!dir->dd_handle) {
1435                errno = EBADF; /* No set_errno for mingw */
1436                return NULL;
1437        }
1438
1439        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1440        {
1441                DWORD lasterr;
1442                handle = FindFirstFileA(dir->dd_name, &buf);
1443                lasterr = GetLastError();
1444                dir->dd_handle = (long)handle;
1445                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1446                        errno = err_win_to_posix(lasterr);
1447                        return NULL;
1448                }
1449        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1450                return NULL;
1451        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1452                DWORD lasterr = GetLastError();
1453                FindClose((HANDLE)dir->dd_handle);
1454                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1455                /* POSIX says you shouldn't set errno when readdir can't
1456                   find any more files; so, if another error we leave it set. */
1457                if (lasterr != ERROR_NO_MORE_FILES)
1458                        errno = err_win_to_posix(lasterr);
1459                return NULL;
1460        }
1461
1462        /* We get here if `buf' contains valid data.  */
1463        strcpy(dir->dd_dir.d_name, buf.cFileName);
1464        ++dir->dd_stat;
1465
1466        /* Set file type, based on WIN32_FIND_DATA */
1467        mdir->dd_dir.d_type = 0;
1468        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1469                mdir->dd_dir.d_type |= DT_DIR;
1470        else
1471                mdir->dd_dir.d_type |= DT_REG;
1472
1473        return (struct dirent*)&dir->dd_dir;
1474}
1475#endif // !NO_MINGW_REPLACE_READDIR