git.oblomov.eu Git - git/blob - compat/winansi.c

   1 /*
   2  * Copyright 2008 Peter Harris <git@peter.is-a-geek.org>
   3  */
   4
   5 #undef NOGDI
   6 #include "../git-compat-util.h"
   7 #include <wingdi.h>
   8 #include <winreg.h>
   9 #include "win32.h"
  10
  11 static int fd_is_interactive[3] = { 0, 0, 0 };
  12 #define FD_CONSOLE 0x1
  13 #define FD_SWAPPED 0x2
  14 #define FD_MSYS    0x4
  15
  16 /*
  17  ANSI codes used by git: m, K
  18
  19  This file is git-specific. Therefore, this file does not attempt
  20  to implement any codes that are not used by git.
  21 */
  22
  23 static HANDLE console;
  24 static WORD plain_attr;
  25 static WORD attr;
  26 static int negative;
  27 static int non_ascii_used = 0;
  28 static HANDLE hthread, hread, hwrite;
  29 static HANDLE hconsole1, hconsole2;
  30
  31 #ifdef __MINGW32__
  32 #if !defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 5
  33 typedef struct _CONSOLE_FONT_INFOEX {
  34         ULONG cbSize;
  35         DWORD nFont;
  36         COORD dwFontSize;
  37         UINT FontFamily;
  38         UINT FontWeight;
  39         WCHAR FaceName[LF_FACESIZE];
  40 } CONSOLE_FONT_INFOEX, *PCONSOLE_FONT_INFOEX;
  41 #endif
  42 #endif
  43
  44 typedef BOOL (WINAPI *PGETCURRENTCONSOLEFONTEX)(HANDLE, BOOL,
  45                 PCONSOLE_FONT_INFOEX);
  46
  47 static void warn_if_raster_font(void)
  48 {
  49         DWORD fontFamily = 0;
  50         PGETCURRENTCONSOLEFONTEX pGetCurrentConsoleFontEx;
  51
  52         /* don't bother if output was ascii only */
  53         if (!non_ascii_used)
  54                 return;
  55
  56         /* GetCurrentConsoleFontEx is available since Vista */
  57         pGetCurrentConsoleFontEx = (PGETCURRENTCONSOLEFONTEX) GetProcAddress(
  58                         GetModuleHandle("kernel32.dll"),
  59                         "GetCurrentConsoleFontEx");
  60         if (pGetCurrentConsoleFontEx) {
  61                 CONSOLE_FONT_INFOEX cfi;
  62                 cfi.cbSize = sizeof(cfi);
  63                 if (pGetCurrentConsoleFontEx(console, 0, &cfi))
  64                         fontFamily = cfi.FontFamily;
  65         } else {
  66                 /* pre-Vista: check default console font in registry */
  67                 HKEY hkey;
  68                 if (ERROR_SUCCESS == RegOpenKeyExA(HKEY_CURRENT_USER, "Console",
  69                                 0, KEY_READ, &hkey)) {
  70                         DWORD size = sizeof(fontFamily);
  71                         RegQueryValueExA(hkey, "FontFamily", NULL, NULL,
  72                                         (LPVOID) &fontFamily, &size);
  73                         RegCloseKey(hkey);
  74                 }
  75         }
  76
  77         if (!(fontFamily & TMPF_TRUETYPE)) {
  78                 const wchar_t *msg = L"\nWarning: Your console font probably "
  79                         L"doesn\'t support Unicode. If you experience strange "
  80                         L"characters in the output, consider switching to a "
  81                         L"TrueType font such as Consolas!\n";
  82                 DWORD dummy;
  83                 WriteConsoleW(console, msg, wcslen(msg), &dummy, NULL);
  84         }
  85 }
  86
  87 static int is_console(int fd)
  88 {
  89         CONSOLE_SCREEN_BUFFER_INFO sbi;
  90         DWORD mode;
  91         HANDLE hcon;
  92
  93         static int initialized = 0;
  94
  95         /* get OS handle of the file descriptor */
  96         hcon = (HANDLE) _get_osfhandle(fd);
  97         if (hcon == INVALID_HANDLE_VALUE)
  98                 return 0;
  99
 100         /* check if its a device (i.e. console, printer, serial port) */
 101         if (GetFileType(hcon) != FILE_TYPE_CHAR)
 102                 return 0;
 103
 104         /* check if its a handle to a console output screen buffer */
 105         if (!fd) {
 106                 if (!GetConsoleMode(hcon, &mode))
 107                         return 0;
 108                 /*
 109                  * This code path is only reached if there is no console
 110                  * attached to stdout/stderr, i.e. we will not need to output
 111                  * any text to any console, therefore we might just as well
 112                  * use black as foreground color.
 113                  */
 114                 sbi.wAttributes = 0;
 115         } else if (!GetConsoleScreenBufferInfo(hcon, &sbi))
 116                 return 0;
 117
 118         if (fd >= 0 && fd <= 2)
 119                 fd_is_interactive[fd] |= FD_CONSOLE;
 120
 121         /* initialize attributes */
 122         if (!initialized) {
 123                 console = hcon;
 124                 attr = plain_attr = sbi.wAttributes;
 125                 negative = 0;
 126                 initialized = 1;
 127         }
 128
 129         return 1;
 130 }
 131
 132 #define BUFFER_SIZE 4096
 133 #define MAX_PARAMS 16
 134
 135 static void write_console(unsigned char *str, size_t len)
 136 {
 137         /* only called from console_thread, so a static buffer will do */
 138         static wchar_t wbuf[2 * BUFFER_SIZE + 1];
 139         DWORD dummy;
 140
 141         /* convert utf-8 to utf-16 */
 142         int wlen = xutftowcsn(wbuf, (char*) str, ARRAY_SIZE(wbuf), len);
 143         if (wlen < 0) {
 144                 wchar_t *err = L"[invalid]";
 145                 WriteConsoleW(console, err, wcslen(err), &dummy, NULL);
 146                 return;
 147         }
 148
 149         /* write directly to console */
 150         WriteConsoleW(console, wbuf, wlen, &dummy, NULL);
 151
 152         /* remember if non-ascii characters are printed */
 153         if (wlen != len)
 154                 non_ascii_used = 1;
 155 }
 156
 157 #define FOREGROUND_ALL (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE)
 158 #define BACKGROUND_ALL (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE)
 159
 160 static void set_console_attr(void)
 161 {
 162         WORD attributes = attr;
 163         if (negative) {
 164                 attributes &= ~FOREGROUND_ALL;
 165                 attributes &= ~BACKGROUND_ALL;
 166
 167                 /* This could probably use a bitmask
 168                    instead of a series of ifs */
 169                 if (attr & FOREGROUND_RED)
 170                         attributes |= BACKGROUND_RED;
 171                 if (attr & FOREGROUND_GREEN)
 172                         attributes |= BACKGROUND_GREEN;
 173                 if (attr & FOREGROUND_BLUE)
 174                         attributes |= BACKGROUND_BLUE;
 175
 176                 if (attr & BACKGROUND_RED)
 177                         attributes |= FOREGROUND_RED;
 178                 if (attr & BACKGROUND_GREEN)
 179                         attributes |= FOREGROUND_GREEN;
 180                 if (attr & BACKGROUND_BLUE)
 181                         attributes |= FOREGROUND_BLUE;
 182         }
 183         SetConsoleTextAttribute(console, attributes);
 184 }
 185
 186 static void erase_in_line(void)
 187 {
 188         CONSOLE_SCREEN_BUFFER_INFO sbi;
 189         DWORD dummy; /* Needed for Windows 7 (or Vista) regression */
 190
 191         if (!console)
 192                 return;
 193
 194         GetConsoleScreenBufferInfo(console, &sbi);
 195         FillConsoleOutputCharacterA(console, ' ',
 196                 sbi.dwSize.X - sbi.dwCursorPosition.X, sbi.dwCursorPosition,
 197                 &dummy);
 198 }
 199
 200 static void set_attr(char func, const int *params, int paramlen)
 201 {
 202         int i;
 203         switch (func) {
 204         case 'm':
 205                 for (i = 0; i < paramlen; i++) {
 206                         switch (params[i]) {
 207                         case 0: /* reset */
 208                                 attr = plain_attr;
 209                                 negative = 0;
 210                                 break;
 211                         case 1: /* bold */
 212                                 attr |= FOREGROUND_INTENSITY;
 213                                 break;
 214                         case 2:  /* faint */
 215                         case 22: /* normal */
 216                                 attr &= ~FOREGROUND_INTENSITY;
 217                                 break;
 218                         case 3:  /* italic */
 219                                 /* Unsupported */
 220                                 break;
 221                         case 4:  /* underline */
 222                         case 21: /* double underline */
 223                                 /* Wikipedia says this flag does nothing */
 224                                 /* Furthermore, mingw doesn't define this flag
 225                                 attr |= COMMON_LVB_UNDERSCORE; */
 226                                 break;
 227                         case 24: /* no underline */
 228                                 /* attr &= ~COMMON_LVB_UNDERSCORE; */
 229                                 break;
 230                         case 5:  /* slow blink */
 231                         case 6:  /* fast blink */
 232                                 /* We don't have blink, but we do have
 233                                    background intensity */
 234                                 attr |= BACKGROUND_INTENSITY;
 235                                 break;
 236                         case 25: /* no blink */
 237                                 attr &= ~BACKGROUND_INTENSITY;
 238                                 break;
 239                         case 7:  /* negative */
 240                                 negative = 1;
 241                                 break;
 242                         case 27: /* positive */
 243                                 negative = 0;
 244                                 break;
 245                         case 8:  /* conceal */
 246                         case 28: /* reveal */
 247                                 /* Unsupported */
 248                                 break;
 249                         case 30: /* Black */
 250                                 attr &= ~FOREGROUND_ALL;
 251                                 break;
 252                         case 31: /* Red */
 253                                 attr &= ~FOREGROUND_ALL;
 254                                 attr |= FOREGROUND_RED;
 255                                 break;
 256                         case 32: /* Green */
 257                                 attr &= ~FOREGROUND_ALL;
 258                                 attr |= FOREGROUND_GREEN;
 259                                 break;
 260                         case 33: /* Yellow */
 261                                 attr &= ~FOREGROUND_ALL;
 262                                 attr |= FOREGROUND_RED | FOREGROUND_GREEN;
 263                                 break;
 264                         case 34: /* Blue */
 265                                 attr &= ~FOREGROUND_ALL;
 266                                 attr |= FOREGROUND_BLUE;
 267                                 break;
 268                         case 35: /* Magenta */
 269                                 attr &= ~FOREGROUND_ALL;
 270                                 attr |= FOREGROUND_RED | FOREGROUND_BLUE;
 271                                 break;
 272                         case 36: /* Cyan */
 273                                 attr &= ~FOREGROUND_ALL;
 274                                 attr |= FOREGROUND_GREEN | FOREGROUND_BLUE;
 275                                 break;
 276                         case 37: /* White */
 277                                 attr |= FOREGROUND_RED |
 278                                         FOREGROUND_GREEN |
 279                                         FOREGROUND_BLUE;
 280                                 break;
 281                         case 38: /* Unknown */
 282                                 break;
 283                         case 39: /* reset */
 284                                 attr &= ~FOREGROUND_ALL;
 285                                 attr |= (plain_attr & FOREGROUND_ALL);
 286                                 break;
 287                         case 40: /* Black */
 288                                 attr &= ~BACKGROUND_ALL;
 289                                 break;
 290                         case 41: /* Red */
 291                                 attr &= ~BACKGROUND_ALL;
 292                                 attr |= BACKGROUND_RED;
 293                                 break;
 294                         case 42: /* Green */
 295                                 attr &= ~BACKGROUND_ALL;
 296                                 attr |= BACKGROUND_GREEN;
 297                                 break;
 298                         case 43: /* Yellow */
 299                                 attr &= ~BACKGROUND_ALL;
 300                                 attr |= BACKGROUND_RED | BACKGROUND_GREEN;
 301                                 break;
 302                         case 44: /* Blue */
 303                                 attr &= ~BACKGROUND_ALL;
 304                                 attr |= BACKGROUND_BLUE;
 305                                 break;
 306                         case 45: /* Magenta */
 307                                 attr &= ~BACKGROUND_ALL;
 308                                 attr |= BACKGROUND_RED | BACKGROUND_BLUE;
 309                                 break;
 310                         case 46: /* Cyan */
 311                                 attr &= ~BACKGROUND_ALL;
 312                                 attr |= BACKGROUND_GREEN | BACKGROUND_BLUE;
 313                                 break;
 314                         case 47: /* White */
 315                                 attr |= BACKGROUND_RED |
 316                                         BACKGROUND_GREEN |
 317                                         BACKGROUND_BLUE;
 318                                 break;
 319                         case 48: /* Unknown */
 320                                 break;
 321                         case 49: /* reset */
 322                                 attr &= ~BACKGROUND_ALL;
 323                                 attr |= (plain_attr & BACKGROUND_ALL);
 324                                 break;
 325                         default:
 326                                 /* Unsupported code */
 327                                 break;
 328                         }
 329                 }
 330                 set_console_attr();
 331                 break;
 332         case 'K':
 333                 erase_in_line();
 334                 break;
 335         default:
 336                 /* Unsupported code */
 337                 break;
 338         }
 339 }
 340
 341 enum {
 342         TEXT = 0, ESCAPE = 033, BRACKET = '['
 343 };
 344
 345 static DWORD WINAPI console_thread(LPVOID unused)
 346 {
 347         unsigned char buffer[BUFFER_SIZE];
 348         DWORD bytes;
 349         int start, end = 0, c, parampos = 0, state = TEXT;
 350         int params[MAX_PARAMS];
 351
 352         while (1) {
 353                 /* read next chunk of bytes from the pipe */
 354                 if (!ReadFile(hread, buffer + end, BUFFER_SIZE - end, &bytes,
 355                                 NULL)) {
 356                         /* exit if pipe has been closed or disconnected */
 357                         if (GetLastError() == ERROR_PIPE_NOT_CONNECTED ||
 358                                         GetLastError() == ERROR_BROKEN_PIPE)
 359                                 break;
 360                         /* ignore other errors */
 361                         continue;
 362                 }
 363
 364                 /* scan the bytes and handle ANSI control codes */
 365                 bytes += end;
 366                 start = end = 0;
 367                 while (end < bytes) {
 368                         c = buffer[end++];
 369                         switch (state) {
 370                         case TEXT:
 371                                 if (c == ESCAPE) {
 372                                         /* print text seen so far */
 373                                         if (end - 1 > start)
 374                                                 write_console(buffer + start,
 375                                                         end - 1 - start);
 376
 377                                         /* then start parsing escape sequence */
 378                                         start = end - 1;
 379                                         memset(params, 0, sizeof(params));
 380                                         parampos = 0;
 381                                         state = ESCAPE;
 382                                 }
 383                                 break;
 384
 385                         case ESCAPE:
 386                                 /* continue if "\033[", otherwise bail out */
 387                                 state = (c == BRACKET) ? BRACKET : TEXT;
 388                                 break;
 389
 390                         case BRACKET:
 391                                 /* parse [0-9;]* into array of parameters */
 392                                 if (c >= '0' && c <= '9') {
 393                                         params[parampos] *= 10;
 394                                         params[parampos] += c - '0';
 395                                 } else if (c == ';') {
 396                                         /*
 397                                          * next parameter, bail out if out of
 398                                          * bounds
 399                                          */
 400                                         parampos++;
 401                                         if (parampos >= MAX_PARAMS)
 402                                                 state = TEXT;
 403                                 } else {
 404                                         /*
 405                                          * end of escape sequence, change
 406                                          * console attributes
 407                                          */
 408                                         set_attr(c, params, parampos + 1);
 409                                         start = end;
 410                                         state = TEXT;
 411                                 }
 412                                 break;
 413                         }
 414                 }
 415
 416                 /* print remaining text unless parsing an escape sequence */
 417                 if (state == TEXT && end > start) {
 418                         /* check for incomplete UTF-8 sequences and fix end */
 419                         if (buffer[end - 1] >= 0x80) {
 420                                 if (buffer[end -1] >= 0xc0)
 421                                         end--;
 422                                 else if (end - 1 > start &&
 423                                                 buffer[end - 2] >= 0xe0)
 424                                         end -= 2;
 425                                 else if (end - 2 > start &&
 426                                                 buffer[end - 3] >= 0xf0)
 427                                         end -= 3;
 428                         }
 429
 430                         /* print remaining complete UTF-8 sequences */
 431                         if (end > start)
 432                                 write_console(buffer + start, end - start);
 433
 434                         /* move remaining bytes to the front */
 435                         if (end < bytes)
 436                                 memmove(buffer, buffer + end, bytes - end);
 437                         end = bytes - end;
 438                 } else {
 439                         /* all data has been consumed, mark buffer empty */
 440                         end = 0;
 441                 }
 442         }
 443
 444         /* check if the console font supports unicode */
 445         warn_if_raster_font();
 446
 447         CloseHandle(hread);
 448         return 0;
 449 }
 450
 451 static void winansi_exit(void)
 452 {
 453         /* flush all streams */
 454         _flushall();
 455
 456         /* signal console thread to exit */
 457         FlushFileBuffers(hwrite);
 458         DisconnectNamedPipe(hwrite);
 459
 460         /* wait for console thread to copy remaining data */
 461         WaitForSingleObject(hthread, INFINITE);
 462
 463         /* cleanup handles... */
 464         CloseHandle(hwrite);
 465         CloseHandle(hthread);
 466 }
 467
 468 static void die_lasterr(const char *fmt, ...)
 469 {
 470         va_list params;
 471         va_start(params, fmt);
 472         errno = err_win_to_posix(GetLastError());
 473         die_errno(fmt, params);
 474         va_end(params);
 475 }
 476
 477 #undef dup2
 478 int winansi_dup2(int oldfd, int newfd)
 479 {
 480         int ret = dup2(oldfd, newfd);
 481
 482         if (!ret && newfd >= 0 && newfd <= 2)
 483                 fd_is_interactive[newfd] = oldfd < 0 || oldfd > 2 ?
 484                         0 : fd_is_interactive[oldfd];
 485
 486         return ret;
 487 }
 488
 489 static HANDLE duplicate_handle(HANDLE hnd)
 490 {
 491         HANDLE hresult, hproc = GetCurrentProcess();
 492         if (!DuplicateHandle(hproc, hnd, hproc, &hresult, 0, TRUE,
 493                         DUPLICATE_SAME_ACCESS))
 494                 die_lasterr("DuplicateHandle(%li) failed",
 495                         (long) (intptr_t) hnd);
 496         return hresult;
 497 }
 498
 499 static HANDLE swap_osfhnd(int fd, HANDLE new_handle)
 500 {
 501         /*
 502          * Create a copy of the original handle associated with fd
 503          * because the original will get closed when we dup2().
 504          */
 505         HANDLE handle = (HANDLE)_get_osfhandle(fd);
 506         HANDLE duplicate = duplicate_handle(handle);
 507
 508         /* Create a temp fd associated with the already open "new_handle". */
 509         int new_fd = _open_osfhandle((intptr_t)new_handle, O_BINARY);
 510
 511         assert((fd == 1) || (fd == 2));
 512
 513         /*
 514          * Use stock dup2() to re-bind fd to the new handle.  Note that
 515          * this will implicitly close(1) and close both fd=1 and the
 516          * originally associated handle.  It will open a new fd=1 and
 517          * call DuplicateHandle() on the handle associated with new_fd.
 518          * It is because of this implicit close() that we created the
 519          * copy of the original.
 520          *
 521          * Note that we need to update the cached console handle to the
 522          * duplicated one because the dup2() call will implicitly close
 523          * the original one.
 524          *
 525          * Note that dup2() when given target := {0,1,2} will also
 526          * call SetStdHandle(), so we don't need to worry about that.
 527          */
 528         if (console == handle)
 529                 console = duplicate;
 530         dup2(new_fd, fd);
 531
 532         /* Close the temp fd.  This explicitly closes "new_handle"
 533          * (because it has been associated with it).
 534          */
 535         close(new_fd);
 536
 537         if (fd == 2)
 538                 setvbuf(stderr, NULL, _IONBF, BUFSIZ);
 539         fd_is_interactive[fd] |= FD_SWAPPED;
 540
 541         return duplicate;
 542 }
 543
 544 #ifdef DETECT_MSYS_TTY
 545
 546 #include <winternl.h>
 547 #include <ntstatus.h>
 548
 549 static void detect_msys_tty(int fd)
 550 {
 551         ULONG result;
 552         BYTE buffer[1024];
 553         POBJECT_NAME_INFORMATION nameinfo = (POBJECT_NAME_INFORMATION) buffer;
 554         PWSTR name;
 555
 556         /* check if fd is a pipe */
 557         HANDLE h = (HANDLE) _get_osfhandle(fd);
 558         if (GetFileType(h) != FILE_TYPE_PIPE)
 559                 return;
 560
 561         /* get pipe name */
 562         if (!NT_SUCCESS(NtQueryObject(h, ObjectNameInformation,
 563                         buffer, sizeof(buffer) - 2, &result)))
 564                 return;
 565         name = nameinfo->Name.Buffer;
 566         name[nameinfo->Name.Length / sizeof(*name)] = 0;
 567
 568         /*
 569          * Check if this could be a MSYS2 pty pipe ('msys-XXXX-ptyN-XX')
 570          * or a cygwin pty pipe ('cygwin-XXXX-ptyN-XX')
 571          */
 572         if ((!wcsstr(name, L"msys-") && !wcsstr(name, L"cygwin-")) ||
 573                         !wcsstr(name, L"-pty"))
 574                 return;
 575
 576         if (fd == 2)
 577                 setvbuf(stderr, NULL, _IONBF, BUFSIZ);
 578         fd_is_interactive[fd] |= FD_MSYS;
 579 }
 580
 581 #endif
 582
 583 /*
 584  * Wrapper for isatty().  Most calls in the main git code
 585  * call isatty(1 or 2) to see if the instance is interactive
 586  * and should: be colored, show progress, paginate output.
 587  * We lie and give results for what the descriptor WAS at
 588  * startup (and ignore any pipe redirection we internally
 589  * do).
 590  */
 591 #undef isatty
 592 int winansi_isatty(int fd)
 593 {
 594         if (fd >= 0 && fd <= 2)
 595                 return fd_is_interactive[fd] != 0;
 596         return isatty(fd);
 597 }
 598
 599 void winansi_init(void)
 600 {
 601         int con1, con2;
 602         char name[32];
 603
 604         /* check if either stdout or stderr is a console output screen buffer */
 605         con1 = is_console(1);
 606         con2 = is_console(2);
 607
 608         /* Also compute console bit for fd 0 even though we don't need the result here. */
 609         is_console(0);
 610
 611         if (!con1 && !con2) {
 612 #ifdef DETECT_MSYS_TTY
 613                 /* check if stdin / stdout / stderr are MSYS2 pty pipes */
 614                 detect_msys_tty(0);
 615                 detect_msys_tty(1);
 616                 detect_msys_tty(2);
 617 #endif
 618                 return;
 619         }
 620
 621         /* create a named pipe to communicate with the console thread */
 622         xsnprintf(name, sizeof(name), "\\\\.\\pipe\\winansi%lu", GetCurrentProcessId());
 623         hwrite = CreateNamedPipe(name, PIPE_ACCESS_OUTBOUND,
 624                 PIPE_TYPE_BYTE | PIPE_WAIT, 1, BUFFER_SIZE, 0, 0, NULL);
 625         if (hwrite == INVALID_HANDLE_VALUE)
 626                 die_lasterr("CreateNamedPipe failed");
 627
 628         hread = CreateFile(name, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
 629         if (hread == INVALID_HANDLE_VALUE)
 630                 die_lasterr("CreateFile for named pipe failed");
 631
 632         /* start console spool thread on the pipe's read end */
 633         hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
 634         if (hthread == INVALID_HANDLE_VALUE)
 635                 die_lasterr("CreateThread(console_thread) failed");
 636
 637         /* schedule cleanup routine */
 638         if (atexit(winansi_exit))
 639                 die_errno("atexit(winansi_exit) failed");
 640
 641         /* redirect stdout / stderr to the pipe */
 642         if (con1)
 643                 hconsole1 = swap_osfhnd(1, duplicate_handle(hwrite));
 644         if (con2)
 645                 hconsole2 = swap_osfhnd(2, duplicate_handle(hwrite));
 646 }
 647
 648 /*
 649  * Returns the real console handle if stdout / stderr is a pipe redirecting
 650  * to the console. Allows spawn / exec to pass the console to the next process.
 651  */
 652 HANDLE winansi_get_osfhandle(int fd)
 653 {
 654         if (fd == 1 && (fd_is_interactive[1] & FD_SWAPPED))
 655                 return hconsole1;
 656         if (fd == 2 && (fd_is_interactive[2] & FD_SWAPPED))
 657                 return hconsole2;
 658
 659         return (HANDLE)_get_osfhandle(fd);
 660 }