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