DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (b66b287a2650)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bill Law       law@netscape.com
 *   IBM Corp.
 *   Rich Walsh     dragtext@e-vertise.com
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifdef MOZ_OS2_HIGH_MEMORY
// os2safe.h has to be included before os2.h, needed for high mem
#include <os2safe.h>
#endif

#define INCL_PM
#define INCL_GPI
#define INCL_DOS
#define INCL_DOSERRORS
#include <os2.h>

#include "nsNativeAppSupportBase.h"
#include "nsNativeAppSupportOS2.h"
#include "nsAppRunner.h"
#include "nsXULAppAPI.h"
#include "nsString.h"
#include "nsIBrowserDOMWindow.h"
#include "nsICommandLineRunner.h"
#include "nsCOMPtr.h"
#include "nsXPIDLString.h"
#include "nsIComponentManager.h"
#include "nsIServiceManager.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMChromeWindow.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsISupportsArray.h"
#include "nsIWindowWatcher.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIBaseWindow.h"
#include "nsIWidget.h"
#include "nsIAppShellService.h"
#include "nsIXULWindow.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIPromptService.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"

// These are needed to load a URL in a browser window.
#include "nsIDOMLocation.h"
#include "nsIJSContextStack.h"
#include "nsIWebNavigation.h"
#include "nsIWindowMediator.h"

#include <stdlib.h>
#include "prprf.h"

#define kMailtoUrlScheme "mailto:"

/* trying to keep this like Window's COPYDATASTRUCT, but a compiler error is
 * forcing me to add chBuff so that we can append the data to the end of the
 * structure
 */
typedef struct _COPYDATASTRUCT
{
   ULONG   dwData;
   ULONG   cbData;
   PVOID   lpData;
   CHAR    chBuff;
}COPYDATASTRUCT, *PCOPYDATASTRUCT;
#define WM_COPYDATA             (WM_USER + 60)

char szCommandLine[2*CCHMAXPATH];

static HWND hwndForDOMWindow( nsISupports * );

static
nsresult
GetMostRecentWindow(const PRUnichar* aType, nsIDOMWindowInternal** aWindow) {
    nsresult rv;
    nsCOMPtr<nsIWindowMediator> med( do_GetService( NS_WINDOWMEDIATOR_CONTRACTID, &rv ) );
    if ( NS_FAILED( rv ) )
        return rv;

    if ( med )
        return med->GetMostRecentWindow( aType, aWindow );

    return NS_ERROR_FAILURE;
}

static
void
activateWindow( nsIDOMWindowInternal *win ) {
    // Try to get native window handle.
    HWND hwnd = hwndForDOMWindow( win );
    if ( hwnd ) {

        /* if we are looking at a client window, then we really probably want
         * the frame so that we can manipulate THAT
         */
        LONG id = WinQueryWindowUShort( hwnd, QWS_ID );
        if( id == FID_CLIENT )
        {
           hwnd = WinQueryWindow( hwnd, QW_PARENT );
        }

        // Restore the window in case it is minimized.
        // Use the OS call, if possible.
        WinSetWindowPos( hwnd, 0L, 0L, 0L, 0L, 0L, 
                         SWP_SHOW | SWP_RESTORE | SWP_ACTIVATE );
    } else {
        // Use internal method.
        win->Focus();
    }
}


#ifdef DEBUG_law
#undef MOZ_DEBUG_DDE
#define MOZ_DEBUG_DDE 1
#endif

// Simple Win32 mutex wrapper.
struct Mutex {
    Mutex( const char *name )
        : mName( name ),
          mHandle( 0 ),
          mState( 0xFFFF ) {
        /* OS/2 named semaphores must begin with "\\SEM32\\" to be valid */
        mName.Insert("\\SEM32\\", 0);
        APIRET rc = DosCreateMutexSem(mName.get(), &mHandle, 0, FALSE);
        if (rc != NO_ERROR) {
#if MOZ_DEBUG_DDE
            printf("CreateMutex error = 0x%08X\n", (int)rc);
#endif
        }
    }
    ~Mutex() {
        if ( mHandle ) {
            // Make sure we release it if we own it.
            Unlock();

            APIRET rc = DosCloseMutexSem(mHandle);
            if (rc != NO_ERROR) {
#if MOZ_DEBUG_DDE
                printf("CloseHandle error = 0x%08X\n", (int)rc);
#endif
            }
        }
    }
    BOOL Lock( DWORD timeout ) {
        if ( mHandle ) {
#if MOZ_DEBUG_DDE
            printf( "Waiting (%d msec) for DDE mutex...\n", (int)timeout );
#endif
            mState = DosRequestMutexSem( mHandle, timeout );
#if MOZ_DEBUG_DDE
            printf( "...wait complete, result = 0x%08X\n", (int)mState );
#endif
            return (mState == NO_ERROR);
        } else {
            return FALSE;
        }
    }
    void Unlock() {
        if ( mHandle && mState == NO_ERROR ) {
#if MOZ_DEBUG_DDE
            printf( "Releasing DDE mutex\n" );
#endif
            DosReleaseMutexSem( mHandle );
            mState = 0xFFFF;
        }
    }
private:
    nsCString mName;
    HMTX      mHandle;
    DWORD     mState;
};

/* DDE Notes
 *
 * This section describes the Win32 DDE service implementation for
 * Mozilla.  DDE is used on Win32 platforms to communicate between
 * separate instances of mozilla.exe (or other Mozilla-based
 * executables), or, between the Win32 desktop shell and Mozilla.
 *
 * The first instance of Mozilla will become the "server" and
 * subsequent executables (and the shell) will use DDE to send
 * requests to that process.  The requests are DDE "execute" requests
 * that pass the command line arguments.
 *
 * Mozilla registers the DDE application "Mozilla" and currently
 * supports only the "WWW_OpenURL" topic.  This should be reasonably
 * compatible with applications that interfaced with Netscape
 * Communicator (and its predecessors?).  Note that even that topic
 * may not be supported in a compatible fashion as the command-line
 * options for Mozilla are different than for Communiator.
 *
 * It is imperative that at most one instance of Mozilla execute in
 * "server mode" at any one time.  The "native app support" in Mozilla
 * on Win32 ensures that only the server process performs XPCOM
 * initialization (that is not required for subsequent client processes
 * to communicate with the server process).
 *
 * To guarantee that only one server starts up, a Win32 "mutex" is used
 * to ensure only one process executes the server-detection code.  That
 * code consists of initializing DDE and doing a DdeConnect to Mozilla's
 * application/topic.  If that connection succeeds, then a server process
 * must be running already.
 *
 * Otherwise, no server has started.  In that case, the current process
 * calls DdeNameService to register that application/topic.  Only at that
 * point does the mutex get released.
 *
 * There are a couple of subtleties that one should be aware of:
 *
 * 1. It is imperative that DdeInitialize be called only after the mutex
 *    lock has been obtained.  The reason is that at shutdown, DDE
 *    notifications go out to all initialized DDE processes.  Thus, if
 *    the mutex is owned by a terminating intance of Mozilla, then
 *    calling DdeInitialize and then WaitForSingleObject will cause the
 *    DdeUninitialize from the terminating process to "hang" until the
 *    process waiting for the mutex times out (and can then service the
 *    notification that the DDE server is terminating).  So, don't mess
 *    with the sequence of things in the startup/shutdown logic.
 *
 * 2. All mutex requests are made with a reasonably long timeout value and
 *    are designed to "fail safe" (i.e., a timeout is treated as failure).
 *
 * 3. An attempt has been made to minimize the degree to which the main
 *    Mozilla application logic needs to be aware of the DDE mechanisms
 *    implemented herein.  As a result, this module surfaces a very
 *    large-grained interface, consisting of simple start/stop methods.
 *    As a consequence, details of certain scenarios can be "lost."
 *    Particularly, incoming DDE requests can arrive after this module
 *    initiates the DDE server, but before Mozilla is initialized to the
 *    point where those requests can be serviced (e.g., open a browser
 *    window to a particular URL).  Since the client process sends the
 *    request early on, it may not be prepared to respond to that error.
 *    Thus, such situations may fail silently.  The design goal is that
 *    they fail harmlessly.  Refinements on this point will be made as
 *    details emerge (and time permits).
 */

/* Update 2001 March
 *
 * A significant DDE bug in Windows is causing Mozilla to get wedged at
 * startup.  This is detailed in Bugzill bug 53952
 * (http://bugzilla.mozilla.org/show_bug.cgi?id=53952).
 *
 * To resolve this, we are using a new strategy:
 *   o Use a "message window" to detect that Mozilla is already running and
 *     to pass requests from a second instance back to the first;
 *   o Run only as a "DDE server" (not as DDE client); this avoids the
 *     problematic call to DDEConnect().
 *
 * We still use the mutex semaphore to protect the code that detects
 * whether Mozilla is already running.
 */

class nsNativeAppSupportOS2 : public nsNativeAppSupportBase,
                              public nsIObserver
{
public:
    NS_DECL_NSIOBSERVER
    NS_DECL_ISUPPORTS_INHERITED

    // Overrides of base implementation.
    NS_IMETHOD Start( PRBool *aResult );
    NS_IMETHOD Stop( PRBool *aResult );
    NS_IMETHOD Quit();
    NS_IMETHOD Enable();

    // The "old" Start method (renamed).
    NS_IMETHOD StartDDE();

    // Utility function to handle a Win32-specific command line
    // option: "-console", which dynamically creates a Windows
    // console.
    void CheckConsole();

private:
    static HDDEDATA APIENTRY HandleDDENotification( ULONG    idInst,
                                                    USHORT   uType,
                                                    USHORT   uFmt,
                                                    HCONV    hconv,
                                                    HSZ      hsz1,
                                                    HSZ      hsz2,
                                                    HDDEDATA hdata,
                                                    ULONG    dwData1,
                                                    ULONG    dwData2 );
    static void HandleCommandLine(const char* aCmdLineString, nsIFile* aWorkingDir, PRUint32 aState);
    static void ParseDDEArg( HSZ args, int index, nsCString& string);
    static void ParseDDEArg( const char* args, int index, nsCString& aString);
    static void ActivateLastWindow();
    static HDDEDATA CreateDDEData( DWORD value );
    static HDDEDATA CreateDDEData( LPBYTE value, DWORD len );
    static PRBool   InitTopicStrings();
    static int      FindTopic( HSZ topic );
    static nsresult OpenWindow( const char *urlstr, const char *args );
    static nsresult OpenBrowserWindow();

    static int   mConversations;
    enum {
        topicOpenURL,
        topicActivate,
        topicCancelProgress,
        topicVersion,
        topicRegisterViewer,
        topicUnRegisterViewer,
        topicGetWindowInfo,
        // Note: Insert new values above this line!!!!!
        topicCount // Count of the number of real topics
    };

    static HSZ   mApplication, mTopics[ topicCount ];
    static DWORD mInstance;
    static PRBool mCanHandleRequests;
    static char mMutexName[];
    static PRBool mUseDDE;
    friend struct MessageWindow;
}; // nsNativeAppSupportOS2

NS_INTERFACE_MAP_BEGIN(nsNativeAppSupportOS2)
    NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_END_INHERITING(nsNativeAppSupportBase)

NS_IMPL_ADDREF_INHERITED(nsNativeAppSupportOS2, nsNativeAppSupportBase)
NS_IMPL_RELEASE_INHERITED(nsNativeAppSupportOS2, nsNativeAppSupportBase)

void
nsNativeAppSupportOS2::CheckConsole() {
    return;
}


// Create and return an instance of class nsNativeAppSupportOS2.
nsresult
NS_CreateNativeAppSupport( nsINativeAppSupport **aResult ) {
    nsNativeAppSupportOS2 *pNative = new nsNativeAppSupportOS2;
    if (!pNative) return NS_ERROR_OUT_OF_MEMORY;

    // Check for dynamic console creation request.
    pNative->CheckConsole();

    *aResult = pNative;
    NS_ADDREF( *aResult );

    return NS_OK;
}

// Constants
#define MOZ_DDE_APPLICATION    "Mozilla"
#define MOZ_STARTUP_MUTEX_NAME "StartupMutex"
#define MOZ_DDE_START_TIMEOUT 30000
#define MOZ_DDE_STOP_TIMEOUT  15000
#define MOZ_DDE_EXEC_TIMEOUT  15000

// The array entries must match the enum ordering!
const char * const topicNames[] = { "WWW_OpenURL",
                                    "WWW_Activate",
                                    "WWW_CancelProgress",
                                    "WWW_Version",
                                    "WWW_RegisterViewer",
                                    "WWW_UnRegisterViewer",
                                    "WWW_GetWindowInfo" };

// Static member definitions.
int   nsNativeAppSupportOS2::mConversations = 0;
HSZ   nsNativeAppSupportOS2::mApplication   = 0;
HSZ   nsNativeAppSupportOS2::mTopics[nsNativeAppSupportOS2::topicCount] = { 0 };
DWORD nsNativeAppSupportOS2::mInstance      = 0;
PRBool nsNativeAppSupportOS2::mCanHandleRequests   = PR_FALSE;

// Added this as pmddeml has no api like this
int DdeCmpStringHandles( HSZ hsz1, HSZ hsz2 )
{
  char chhsz1[CCHMAXPATH], chhsz2[CCHMAXPATH];
  int rc = -1;

  /* I am assuming that the strings will never be more that CCHMAXPATH in
   * length.  Safe bet (for now).  To find true length, call WinDdeQueryString
   * and pass in (hsz, NULL, 0L, 0) and it will return iLength.  Passing 0
   * for codepage will use the codepage of the current thread.
   */
  WinDdeQueryString( hsz1, chhsz1, sizeof( chhsz1 ), 0 );
  WinDdeQueryString( hsz2, chhsz2, sizeof( chhsz2 ),0 );

  rc = stricmp( chhsz1, chhsz2 );

  return(rc);
}


char *GetCommandLine()
{
   /* This function is meant to be like the Window's GetCommandLine() function.
    * The value returned by pPIB->pib_pchcmd is of the format:
    * <executable>\0<command line parameters>.  So the first string is the
    * .exe and the second string is what followed on the command line.  Dorky,
    * but I guess it'll have to do.
    */
   PTIB pTIB = NULL;
   PPIB pPIB = NULL;
   APIRET rc = NO_ERROR;
   char *pchParam = NULL;

   rc = DosGetInfoBlocks( &pTIB, &pPIB );
   if( rc == NO_ERROR )
   {
      INT iLen = 0;
      char *pchTemp = NULL;
      pchParam = pPIB->pib_pchcmd;
      strcpy( szCommandLine, pchParam );
      iLen = strlen( pchParam );

      /* szCommandLine[iLen] is '\0', so see what's next.  Probably be another
       * '\0', a space or start of the arguments
       */
      pchTemp = &(pchParam[iLen+1]);

      /* At this point, szCommandLine holds just the program name.  Now we
       * go for the parameters.  If our next value is a space, ignore it
       * and go for the next character
       */
      if( *pchTemp )
      {
         szCommandLine[iLen] = ' ';
         iLen++;
         if( *pchTemp == ' ' )
         {
            pchTemp++;
         }
         strcpy( &(szCommandLine[iLen]), pchTemp );
      }

   }

   return( szCommandLine );
}

typedef struct _DDEMLFN
{
   PFN   *fn;
   ULONG ord; 
} DDEMLFN, *PDDEMLFN;

DDEMLFN ddemlfnTable[] = 
{
   { (PFN *)&WinDdeAbandonTransaction   ,100 },
   { (PFN *)&WinDdeAccessData           ,101 },
   { (PFN *)&WinDdeAddData              ,102 },
   { (PFN *)&WinDdeSubmitTransaction    ,103 },
   { (PFN *)&WinDdeCompareStringHandles ,104 },
   { (PFN *)&WinDdeConnect              ,105 },
   { (PFN *)&WinDdeConnectList          ,106 },
   { (PFN *)&WinDdeCreateDataHandle     ,107 },
   { (PFN *)&WinDdeCreateStringHandle   ,108 },
   { (PFN *)&WinDdeDisconnect           ,109 },
   { (PFN *)&WinDdeDisconnectList       ,110 },
   { (PFN *)&WinDdeEnableCallback       ,111 },
   { (PFN *)&WinDdeFreeDataHandle       ,112 },
   { (PFN *)&WinDdeFreeStringHandle     ,113 },
   { (PFN *)&WinDdeGetData              ,114 },
   { (PFN *)&WinDdeInitialize           ,116 },
   { (PFN *)&WinDdeKeepStringHandle     ,117 },
   { (PFN *)&WinDdeNameService          ,118 },
   { (PFN *)&WinDdePostAdvise           ,119 },
   { (PFN *)&WinDdeQueryConvInfo        ,120 },
   { (PFN *)&WinDdeQueryNextServer      ,121 },
   { (PFN *)&WinDdeQueryString          ,122 },
   { (PFN *)&WinDdeReconnect            ,123 },
   { (PFN *)&WinDdeSetUserHandle        ,124 },
   { (PFN *)&WinDdeUninitialize         ,126 },
   { (PFN *)NULL                           ,  0 }
};

/* SetupOS2ddeml makes sure that we can get pointers to all of the DDEML 
 * functions in demlfnTable using entrypoints.  If we can't find one of them
 * or can't load pmddeml.dll, then returns FALSE
 */
BOOL SetupOS2ddeml()
{
    BOOL bRC = FALSE;
    HMODULE hmodDDEML = NULLHANDLE;
    APIRET rc = NO_ERROR;

    rc = DosLoadModule( NULL, 0, "PMDDEML", &hmodDDEML );
    if( rc == NO_ERROR )
    {
       int i;
       /* all of this had better work.  Get ready to be a success! */
       bRC = TRUE;
       for( i=0; ddemlfnTable[i].ord != 0; i++ )
       {
          rc = DosQueryProcAddr( hmodDDEML, ddemlfnTable[i].ord, NULL,
                                 ddemlfnTable[i].fn );
          if( rc != NO_ERROR )
          {
             /* we're horked.  Return rc = horked */
             bRC = FALSE;
             break;
          }
       }
    } /* load PMDDEML */

    return( bRC );
}

char nsNativeAppSupportOS2::mMutexName[ 128 ] = { 0 };


// Message window encapsulation.
struct MessageWindow {
    // ctor/dtor are simplistic
    MessageWindow() {
        // Try to find window.
        HATOMTBL  hatomtbl;
        HENUM     henum;
        HWND      hwndNext;
        char      classname[CCHMAXPATH];

        mHandle = NULLHANDLE;

        hatomtbl = WinQuerySystemAtomTable();
        mMsgWindowAtom = WinFindAtom(hatomtbl, className());
        if (mMsgWindowAtom == 0)
        {
          // If there is not atom in the system table for this class name, then
          // we can assume that the app is not currently running.
          mMsgWindowAtom = WinAddAtom(hatomtbl, className());
        } else {
          // Found an existing atom for this class name.  Cycle through existing
          // windows and see if one with our window id and class name already 
          // exists
          henum = WinBeginEnumWindows(HWND_OBJECT);
          while ((hwndNext = WinGetNextWindow(henum)) != NULLHANDLE)
          {
            if (WinQueryWindowUShort(hwndNext, QWS_ID) == (USHORT)mMsgWindowAtom)
            {
              WinQueryClassName(hwndNext, CCHMAXPATH, classname);
              if (strcmp(classname, className()) == 0)
              {
                mHandle = hwndNext;
                break;
              }
            }
          }
        }
    }

    HWND getHWND() {
        return mHandle;
    }

    // Class name: appName + "MessageWindow"
    static const char *className() {
        static char classNameBuffer[128];
        static char *mClassName = 0;
        if ( !mClassName ) { 
            sprintf( classNameBuffer,
                         "%s%s",
                         gAppData->name,
                         "MessageWindow" );
            mClassName = classNameBuffer;
        }
        return mClassName;
    }

    // Create: Register class and create window.
    NS_IMETHOD Create() {

        // Register the window class.
        NS_ENSURE_TRUE( WinRegisterClass( 0, className(), 
                                          (PFNWP)&MessageWindow::WindowProc, 
                                          0L, 0 ), 
                        NS_ERROR_FAILURE );

        /* Giving a size but offscreen so that won't be seen, even if all
         * goes wrong.  Giving a size so that can be seen and understood by
         * tools
         */
        const char * pszClassName = className();
        mHandle = WinCreateWindow( HWND_OBJECT,
                                   pszClassName,
                                   NULL,        // name
                                   WS_DISABLED, // style
                                   0,0,     // x, y
                                   0,0,       // cx,cy
                                   HWND_DESKTOP,// owner
                                   HWND_BOTTOM,  // hwndbehind
                                   (USHORT)mMsgWindowAtom, // id
                                   NULL,        // pCtlData
                                   NULL );      // pres params

#if MOZ_DEBUG_DDE
        printf( "Message window = 0x%08X\n", (int)mHandle );
#endif

        return NS_OK;
    }

    // Destory:  Get rid of window and reset mHandle.
    NS_IMETHOD Destroy() {
        nsresult retval = NS_OK;

        if ( mHandle ) {
           HATOMTBL hatomtbl = WinQuerySystemAtomTable();
           WinDeleteAtom(hatomtbl, mMsgWindowAtom);
           
            // DestroyWindow can only destroy windows created from
            //  the same thread.
            BOOL desRes = WinDestroyWindow( mHandle );
            if ( FALSE != desRes ) {
                mHandle = NULL;
            }
            else {
                retval = NS_ERROR_FAILURE;
            }
        }

        return retval;
    }

    // SendRequest: Construct a data buffer <commandline>\0<workingdir>\0,
    // then pass the string via WM_COPYDATA to the message window.

    NS_IMETHOD SendRequest( const char *cmd )
    {
    /* Nothing like WM_COPYDATA in OS/2, where the OS allows pointers to be
     * passed to a different process and automatically accessible by that
     * process.  So we have to create shared mem on our side and then the
     * process that gets the WM_COPYDATA message has to do a 
     * DosGetSharedMem on this pointer to be able to access the data
    */

        COPYDATASTRUCT *pcds;
        PVOID pvData = NULL;

        if (!cmd)
            return NS_ERROR_FAILURE;

        ULONG ulSize = sizeof(COPYDATASTRUCT)+strlen(cmd)+1+CCHMAXPATH;
#ifdef MOZ_OS2_HIGH_MEMORY
        APIRET rc = DosAllocSharedMem( &pvData, NULL, ulSize,
                                       PAG_COMMIT | PAG_READ | PAG_WRITE | OBJ_GETTABLE | OBJ_ANY);
        if (rc != NO_ERROR) { // Did the kernel handle OBJ_ANY?
            // Try again without OBJ_ANY and if the first failure was not caused
            // by OBJ_ANY then we will get the same failure, else we have taken
            // care of pre-FP13 systems where the kernel couldn't handle it.
            rc = DosAllocSharedMem( &pvData, NULL, ulSize,
                                    PAG_COMMIT | PAG_READ | PAG_WRITE | OBJ_GETTABLE);
            if (rc != NO_ERROR) {
                return NS_ERROR_OUT_OF_MEMORY;
            }
        }
#else
        if (DosAllocSharedMem( &pvData, NULL, ulSize,
                               PAG_COMMIT | PAG_READ | PAG_WRITE | OBJ_GETTABLE | OBJ_ANY))
            return NS_ERROR_OUT_OF_MEMORY;
#endif

        // We used to set dwData to zero, when we didn't send the
        // working dir.  Now we're using it as a version number.
        // The commandline goes in the buffer space immediately after
        // the COPYDATASTRUCT;  the current directory follows that.
        pcds = (COPYDATASTRUCT *)(pvData);
        pcds->dwData = 1;

        char * ptr = &(pcds->chBuff);
        pcds->lpData = ptr;
        strcpy( ptr, cmd);
        pcds->cbData = strlen( ptr) + 1;
        ptr += pcds->cbData;

        if (DosQueryPathInfo( ".", FIL_QUERYFULLNAME, ptr, CCHMAXPATH)) {
            ptr[0] = '.';
            ptr[1] = '\0';
        }
        pcds->cbData += strlen( ptr) + 1;

        WinSendMsg( mHandle, WM_COPYDATA, 0, (MPARAM)pcds );
        DosFreeMem( pvData );

        return NS_OK;
    }

    // Window proc.
    static
    MRESULT EXPENTRY WindowProc( HWND msgWindow, ULONG msg, MPARAM wp, MPARAM lp )
    {
        // We have to return a FALSE from WM_CREATE
        if ( msg == WM_CREATE )
            return (MRESULT)FALSE;

        if ( msg != WM_COPYDATA ) 
            return (MRESULT)TRUE;

        // This is an incoming request.
        COPYDATASTRUCT *cds = (COPYDATASTRUCT*)lp;
        DosGetSharedMem( (PVOID)cds, PAG_READ|PAG_WRITE );

        nsCOMPtr<nsILocalFile> workingDir;

        // a "1" or greater indicates that the other process's working
        // directory follows the commandline string - locate & convert it
        if (cds->dwData >= 1) {
            char* wdpath = strchr( (char*)cds->lpData, 0) + 1;
            NS_NewNativeLocalFile(nsDependentCString(wdpath),
                                  PR_FALSE, getter_AddRefs(workingDir));
        }

        nsNativeAppSupportOS2::HandleCommandLine((char*)cds->lpData,
                                workingDir, nsICommandLine::STATE_REMOTE_AUTO);

        return (MRESULT)TRUE;
    }

private:
    HWND mHandle;
    USHORT   mMsgWindowAtom;
}; // struct MessageWindow

PRBool nsNativeAppSupportOS2::mUseDDE = PR_FALSE;

/* Start: Tries to find the "message window" to determine if it
 *        exists.  If so, then Mozilla is already running.  In that
 *        case, we use the handle to the "message" window and send
 *        a request corresponding to this process's command line
 *        options.
 *
 *        If not, then this is the first instance of Mozilla.  In
 *        that case, we create and set up the message window.
 *
 *        The checking for existance of the message window must
 *        be protected by use of a mutex semaphore.
 */
NS_IMETHODIMP
nsNativeAppSupportOS2::Start( PRBool *aResult ) {
    NS_ENSURE_ARG( aResult );
    NS_ENSURE_TRUE( mInstance == 0, NS_ERROR_NOT_INITIALIZED );

    nsresult rv = NS_ERROR_FAILURE;
    *aResult = PR_FALSE;

    // see if DDE should be enabled AND remove OS/2-specific
    // options the app's commandline handler won't recognize
    // (-console was handled earlier by StartOS2App())
    for (int i = 1; i < gArgc; i++) {
        if (stricmp("-dde", gArgv[i]) == 0 ||
            stricmp("/dde", gArgv[i]) == 0)
            mUseDDE = PR_TRUE;
        else
            if (stricmp("-console", gArgv[i]) != 0 &&
                stricmp("/console", gArgv[i]) != 0)
                continue;

        for (int j = i; j < gArgc; j++)
            gArgv[j] = gArgv[j+1];
        gArgc--;
        i--;
    }

    // if this is a standalone instance, turn off DDE regardless of the
    // commandline, then skip out before we look for another instance
    if (getenv("MOZ_NO_REMOTE")) {
        mUseDDE = PR_FALSE;
        *aResult = PR_TRUE;
        return NS_OK;
    }

    // Grab mutex first.

    // Build mutex name from app name.
    PR_snprintf( mMutexName, sizeof mMutexName, "%s%s", gAppData->name, MOZ_STARTUP_MUTEX_NAME );
    Mutex startupLock = Mutex( mMutexName );

    NS_ENSURE_TRUE( startupLock.Lock( MOZ_DDE_START_TIMEOUT ), NS_ERROR_FAILURE );

    /* We need to have a message queue to do the MessageWindow stuff (for both
     * Create() and SendRequest()).  If we don't have one, make it now.
     * If we are going to end up going away right after ::Start() returns,
     * then make sure to clean up the message queue.
     */
    MQINFO mqinfo;
    HAB hab;
    HMQ hmqCurrent = WinQueryQueueInfo( HMQ_CURRENT, &mqinfo, 
                                        sizeof( MQINFO ) );
    if( !hmqCurrent ) {
        hab = WinInitialize( 0 );
        hmqCurrent = WinCreateMsgQueue( hab, 0 );
    }

    // Search for existing message window.
    MessageWindow msgWindow;
    if ( msgWindow.getHWND() ) {
        // We are a client process.  Pass request to message window.
        char *cmd = GetCommandLine();
        rv = msgWindow.SendRequest( cmd );
    } else {
        // We will be server.
        rv = msgWindow.Create();
        if ( NS_SUCCEEDED( rv ) ) {
            // Start up DDE server
            if (mUseDDE)
                this->StartDDE();
            // Tell caller to spin message loop.
            *aResult = PR_TRUE;
        }
    }

    startupLock.Unlock();

    if( *aResult == PR_FALSE )
    {
        /* This process isn't going to continue much longer.  Make sure that we
         * clean up the message queue
         */
        if (hmqCurrent)
           WinDestroyMsgQueue(hmqCurrent);
        if (hab)
           WinTerminate(hab);
    }

    return rv;
}

PRBool
nsNativeAppSupportOS2::InitTopicStrings() {
    for ( int i = 0; i < topicCount; i++ ) {
        if ( !( mTopics[ i ] = WinDdeCreateStringHandle( (PSZ)topicNames[ i ], CP_WINANSI ) ) ) {
            return PR_FALSE;
        }
    }
    return PR_TRUE;
}

int
nsNativeAppSupportOS2::FindTopic( HSZ topic ) {
    for ( int i = 0; i < topicCount; i++ ) {
        if ( DdeCmpStringHandles( topic, mTopics[i] ) == 0 ) {
            return i;
        }
    }
    return -1;
}

// Start DDE server.
//
// This used to be the Start() method when we were using DDE as the
// primary IPC mechanism between secondary Mozilla processes and the
// initial "server" process.
//
// Now, it simply initializes the DDE server.  The caller must check
// that this process is to be the server, and, must acquire the DDE
// startup mutex semaphore prior to calling this routine.  See ::Start(),
// above.
NS_IMETHODIMP
nsNativeAppSupportOS2::StartDDE() {
    NS_ENSURE_TRUE( mInstance == 0, NS_ERROR_NOT_INITIALIZED );

    /* Get entrypoints for PMDDEML */
    BOOL bDDEML = SetupOS2ddeml();

    /* If we couldn't initialize DDEML, set mUSEDDE to PR_FALSE */
    /* so we don't do anything else DDE related */
    if (!bDDEML) {
       mUseDDE = PR_FALSE;
       return NS_OK;
    }

    // Initialize DDE.
    NS_ENSURE_TRUE( DDEERR_NO_ERROR == WinDdeInitialize( &mInstance,
                                                         nsNativeAppSupportOS2::HandleDDENotification,
                                                         APPCLASS_STANDARD,
                                                         0 ),
                    NS_ERROR_FAILURE );

    // Allocate DDE strings.
    NS_ENSURE_TRUE( ( mApplication = WinDdeCreateStringHandle( (char*) gAppData->name, CP_WINANSI ) ) && InitTopicStrings(),
                    NS_ERROR_FAILURE );

    // Next step is to register a DDE service.
    NS_ENSURE_TRUE( WinDdeNameService( mInstance, mApplication, 0, DNS_REGISTER ), NS_ERROR_FAILURE );

#if MOZ_DEBUG_DDE
    printf( "DDE server started\n" );
#endif

    return NS_OK;
}

// If no DDE conversations are pending, terminate DDE.
NS_IMETHODIMP
nsNativeAppSupportOS2::Stop( PRBool *aResult ) {
    NS_ENSURE_ARG( aResult );
    NS_ENSURE_TRUE( mInstance, NS_ERROR_NOT_INITIALIZED );

    nsresult rv = NS_OK;
    *aResult = PR_TRUE;

    if (!mUseDDE) {
       return rv;
    }

    Mutex ddeLock( mMutexName );

    if ( ddeLock.Lock( MOZ_DDE_STOP_TIMEOUT ) ) {
        if ( mConversations == 0 ) {
            this->Quit();
        } else {
            *aResult = PR_FALSE;
        }

        ddeLock.Unlock();
    }
    else {
        // No DDE application name specified, but that's OK.  Just
        // forge ahead.
        *aResult = PR_TRUE;
    }

    return rv;
}

NS_IMETHODIMP
nsNativeAppSupportOS2::Observe(nsISupports* aSubject, const char* aTopic,
                               const PRUnichar* aData)
{
    if (strcmp(aTopic, "quit-application") == 0) {
        Quit();
    } else {
        NS_ERROR("Unexpected observer topic.");
    }

    return NS_OK;
}

// Terminate DDE regardless.
NS_IMETHODIMP
nsNativeAppSupportOS2::Quit() {
    // If another process wants to look for the message window, they need
    // to wait to hold the lock, in which case they will not find the
    // window as we will destroy ours under our lock.
    // When the mutex goes off the stack, it is unlocked via destructor.
    Mutex mutexLock(mMutexName);
    NS_ENSURE_TRUE(mutexLock.Lock(MOZ_DDE_START_TIMEOUT), NS_ERROR_FAILURE);

    // If we've got a message window to receive IPC or new window requests,
    // get rid of it as we are shutting down.
    // Note:  Destroy calls DestroyWindow, which will only work on a window
    //  created by the same thread.
    MessageWindow mw;
    mw.Destroy();

    if ( mInstance ) {
        // Unregister application name.
        WinDdeNameService( mInstance, mApplication, 0, DNS_UNREGISTER );
        // Clean up strings.
        if ( mApplication ) {
            WinDdeFreeStringHandle( mApplication );
            mApplication = 0;
        }
        for ( int i = 0; i < topicCount; i++ ) {
            if ( mTopics[i] ) {
                WinDdeFreeStringHandle( mTopics[i] );
                mTopics[i] = 0;
            }
        }
        WinDdeUninitialize( mInstance );
        mInstance = 0;
    }

    return NS_OK;
}

NS_IMETHODIMP
nsNativeAppSupportOS2::Enable()
{
    mCanHandleRequests = PR_TRUE;
    nsCOMPtr<nsIObserverService> obs
        (do_GetService("@mozilla.org/observer-service;1"));
    if (obs) {
        obs->AddObserver(this, "quit-application", PR_FALSE);
    } else {
        NS_ERROR("No observer service?");
    }

    return NS_OK;
}

#if MOZ_DEBUG_DDE
// Macro to generate case statement for a given XTYP value.
#define XTYP_CASE(t) \
    case t: result = #t; break

static nsCString uTypeDesc( UINT uType ) {
    nsCString result;
    switch ( uType ) {
    XTYP_CASE(XTYP_ADVSTART);
    XTYP_CASE(XTYP_CONNECT);
    XTYP_CASE(XTYP_ADVREQ);
    XTYP_CASE(XTYP_REQUEST);
    XTYP_CASE(XTYP_WILDCONNECT);
    XTYP_CASE(XTYP_ADVDATA);
    XTYP_CASE(XTYP_EXECUTE);
    XTYP_CASE(XTYP_POKE);
    XTYP_CASE(XTYP_ADVSTOP);
    XTYP_CASE(XTYP_CONNECT_CONFIRM);
    XTYP_CASE(XTYP_DISCONNECT);
    XTYP_CASE(XTYP_ERROR);
    XTYP_CASE(XTYP_MONITOR);
    XTYP_CASE(XTYP_REGISTER);
    XTYP_CASE(XTYP_XACT_COMPLETE);
    XTYP_CASE(XTYP_UNREGISTER);
    default: result = "XTYP_?????";
    }
    return result;
}

static nsCString hszValue( DWORD instance, HSZ hsz ) {
    // Extract string from HSZ.
    nsCString result("[");
    DWORD len = WinDdeQueryString( hsz, NULL, NULL, CP_WINANSI );
    if ( len ) {
        char buffer[ 256 ];
        WinDdeQueryString( hsz, buffer, sizeof buffer, CP_WINANSI );
        result += buffer;
    }
    result += "]";
    return result;
}
#endif


// Utility function to escape double-quotes within a string.
static void escapeQuotes( nsAString &aString ) {
    PRInt32 offset = -1;
    while( 1 ) {
       // Find next '"'.
       offset = aString.FindChar( '"', ++offset );
       if ( offset == kNotFound ) {
           // No more quotes, exit.
           break;
       } else {
           // Insert back-slash ahead of the '"'.
           aString.Insert( PRUnichar('\\'), offset );
           // Increment offset because we just inserted a slash
           offset++;
       }
    }
    return;
}


HDDEDATA APIENTRY
nsNativeAppSupportOS2::HandleDDENotification( ULONG idInst,     // DDEML instance
                                              USHORT uType,     // transaction type
                                              USHORT uFmt,      // clipboard data format
                                              HCONV hconv,      // handle to the conversation
                                              HSZ hsz1,         // handle to a string
                                              HSZ hsz2,         // handle to a string
                                              HDDEDATA hdata,   // handle to a global memory object
                                              ULONG dwData1,    // transaction-specific data
                                              ULONG dwData2 ) { // transaction-specific data

#if MOZ_DEBUG_DDE
    printf( "DDE: uType  =%s\n",      uTypeDesc( uType ).get() );
    printf( "     uFmt   =%u\n",      (unsigned)uFmt );
    printf( "     hconv  =%08x\n",    (int)hconv );
    printf( "     hsz1   =%08x:%s\n", (int)hsz1, hszValue( mInstance, hsz1 ).get() );
    printf( "     hsz2   =%08x:%s\n", (int)hsz2, hszValue( mInstance, hsz2 ).get() );
    printf( "     hdata  =%08x\n",    (int)hdata );
    printf( "     dwData1=%08x\n",    (int)dwData1 );
    printf( "     dwData2=%08x\n",    (int)dwData2 );
#endif

    HDDEDATA result = 0;
    if ( uType & XCLASS_BOOL ) {
        switch ( uType ) {
            case XTYP_CONNECT:
                // Make sure its for our service/topic.
                if ( FindTopic( hsz1 ) != -1 ) {
                    // We support this connection.
                    result = (HDDEDATA)1;
                }
                break;
            case XTYP_CONNECT_CONFIRM:
                // We don't care about the conversation handle, at this point.
                result = (HDDEDATA)1;
                break;
        }
    } else if ( uType & XCLASS_DATA ) {
        if ( uType == XTYP_REQUEST ) {
            switch ( FindTopic( hsz1 ) ) {
                case topicOpenURL: {
                    // Open a given URL...

                    // Get the URL from the first argument in the command.
                    nsCAutoString url;
                    ParseDDEArg(hsz2, 0, url);

                    // Read the 3rd argument in the command to determine if a
                    // new window is to be used.
                    nsCAutoString windowID;
                    ParseDDEArg(hsz2, 2, windowID);
                    // to open the URL in a new window, the old OS/2 code
                    // looks for "0" while the new Win32 code looks for "";
                    // not knowing which is correct, we'll look for both
                    if (windowID.Equals( "0" ) || windowID.Equals( "" ))
                        url.Insert("mozilla -new-window ", 0);
                    else
                        url.Insert("mozilla -url ", 0);

#if MOZ_DEBUG_DDE
                    printf( "Handling dde XTYP_REQUEST request: [%s]...\n", url.get() );
#endif
                    // Now handle it.
                    HandleCommandLine(url.get(), nsnull, nsICommandLine::STATE_REMOTE_EXPLICIT);
                    // Return pseudo window ID.
                    result = CreateDDEData( 1 );
                    break;
                }
                case topicGetWindowInfo: {
                    // This topic has to get the current URL, get the current
                    // page title and then format the output into the DDE
                    // return string.  The return value is "URL","Page Title",
                    // "Window ID" however the window ID is not used for this
                    // command, therefore it is returned as a null string

                    // This isn't really a loop.  We just use "break"
                    // statements to bypass the remaining steps when
                    // something goes wrong.
                    do {
                        // Get most recently used Nav window.
                        nsCOMPtr<nsIDOMWindowInternal> navWin;
                        GetMostRecentWindow( NS_LITERAL_STRING( "navigator:browser" ).get(),
                                             getter_AddRefs( navWin ) );
                        if ( !navWin ) {
                            // There is not a window open
                            break;
                        }
                        // Get content window.
                        nsCOMPtr<nsIDOMWindow> content;
                        navWin->GetContent( getter_AddRefs( content ) );
                        if ( !content ) {
                            break;
                        }
                        // Convert that to internal interface.
                        nsCOMPtr<nsPIDOMWindow> internalContent( do_QueryInterface( content ) );
                        if ( !internalContent ) {
                            break;
                        }
                        // Get location.
                        nsCOMPtr<nsIDOMLocation> location;
                        internalContent->GetLocation( getter_AddRefs( location ) );
                        if ( !location ) {
                            break;
                        }
                        // Get href for URL.
                        nsAutoString url;
                        if ( NS_FAILED( location->GetHref( url ) ) ) {
                            break;
                        }
                        // Escape any double-quotes.
                        escapeQuotes( url );

                        // Now for the title...

                        // Get the base window from the doc shell...
                        nsCOMPtr<nsIBaseWindow> baseWindow =
                          do_QueryInterface( internalContent->GetDocShell() );
                        if ( !baseWindow ) {
                            break;
                        }
                        // And from the base window we can get the title.
                        nsXPIDLString title;
                        if(!baseWindow) {
                            break;
                        }
                        baseWindow->GetTitle(getter_Copies(title));
                        // Escape any double-quotes in the title.
                        escapeQuotes( title );

                        // Use a string buffer for the output data, first
                        // save a quote.
                        nsCAutoString   outpt( NS_LITERAL_CSTRING("\"") );
                        // Now copy the URL converting the Unicode string
                        // to a single-byte ASCII string
                        outpt.Append( NS_LossyConvertUTF16toASCII( url ) );
                        // Add the "," used to separate the URL and the page
                        // title
                        outpt.Append( NS_LITERAL_CSTRING("\",\"") );
                        // Now copy the current page title to the return string
                        outpt.Append( NS_LossyConvertUTF16toASCII( title.get() ));
                        // Fill out the return string with the remainin ",""
                        outpt.Append( NS_LITERAL_CSTRING( "\",\"\"" ));

                        // Create a DDE handle to a char string for the data
                        // being returned, this copies and creates a "shared"
                        // copy of the DDE response until the calling APP
                        // reads it and says it can be freed.
                        result = CreateDDEData( (LPBYTE)(const char*)outpt.get(),
                                                outpt.Length() + 1 );
#if MOZ_DEBUG_DDE
                        printf( "WWW_GetWindowInfo->%s\n", outpt.get() );
#endif
                    } while ( PR_FALSE );
                    break;
                }
                case topicActivate: {
                    // Activate a Nav window...
                    nsCAutoString windowID;
                    ParseDDEArg(hsz2, 0, windowID);
                    // 4294967295 is decimal for 0xFFFFFFFF which is also a
                    //   correct value to do that Activate last window stuff
                    if ( windowID.Equals( "-1" ) ||
                         windowID.Equals( "4294967295" ) ) {
                        // We only support activating the most recent window (or a new one).
                        ActivateLastWindow();
                        // Return pseudo window ID.
                        result = CreateDDEData( 1 );
                    }
                    break;
                }
                case topicVersion: {
                    // Return version.  We're restarting at 1.0!
                    DWORD version = 1 << 16; // "1.0"
                    result = CreateDDEData( version );
                    break;
                }
                case topicRegisterViewer: {
                    // Register new viewer (not implemented).
                    result = CreateDDEData( PR_FALSE );
                    break;
                }
                case topicUnRegisterViewer: {
                    // Unregister new viewer (not implemented).
                    result = CreateDDEData( PR_FALSE );
                    break;
                }
                default:
                    break;
            }
        } else if ( uType & XTYP_POKE ) {
            switch ( FindTopic( hsz1 ) ) {
                case topicCancelProgress: {
                    // "Handle" progress cancel (actually, pretty much ignored).
                    result = (HDDEDATA)DDE_FACK;
                    break;
                }
                default:
                    break;
            }
        }
    } else if ( uType & XCLASS_FLAGS ) {
        if ( uType == XTYP_EXECUTE ) {
            // Prove that we received the request.
            DWORD bytes;
            LPBYTE request = (LPBYTE)WinDdeAccessData( hdata, &bytes );
#if MOZ_DEBUG_DDE
            printf( "Handling dde request: [%s]...\n", (char*)request );
#endif
            nsCAutoString url;
            ParseDDEArg((const char*) request, 0, url);

            // Read the 3rd argument in the command to determine if a
            // new window is to be used.
            nsCAutoString windowID;
            ParseDDEArg((const char*) request, 2, windowID);

            // to open the URL in a new window, the old OS/2 code
            // looks for "0" while the new Win32 code looks for "";
            // not knowing which is correct, we'll look for both
            if (windowID.Equals( "0" ) || windowID.Equals( "" ))
                url.Insert("mozilla -new-window ", 0);
            else
                url.Insert("mozilla -url ", 0);

#if MOZ_DEBUG_DDE
            printf( "Handling dde XTYP_REQUEST request: [%s]...\n", url.get() );
#endif
            // Now handle it.
            HandleCommandLine(url.get(), nsnull, nsICommandLine::STATE_REMOTE_EXPLICIT);

            // Release the data.
//            DdeUnaccessData( hdata );
            result = (HDDEDATA)DDE_FACK;
        } else {
            result = (HDDEDATA)DDE_NOTPROCESSED;
        }
    } else if ( uType & XCLASS_NOTIFICATION ) {
    }
#if MOZ_DEBUG_DDE
    printf( "DDE result=%d (0x%08X)\n", (int)result, (int)result );
#endif
    return result;
}


// Utility function to advance to end of quoted string.
// p+offset must point to the comma preceding the arg on entry.
// On return, p+result points to the closing '"' (or end of the string
// if the closing '"' is missing) if the arg is quoted.  If the arg
// is not quoted, then p+result will point to the first character
// of the arg.
static PRInt32 advanceToEndOfQuotedArg( const char *p, PRInt32 offset, PRInt32 len ) {
    // Check whether the current arg is quoted.
    if ( p[++offset] == '"' ) {
        // Advance past the closing quote.
        while ( offset < len && p[++offset] != '"' ) {
            // If the current character is a backslash, then the
            // next character can't be a *real* '"', so skip it.
            if ( p[offset] == '\\' ) {
                offset++;
            }
        }
    }
    return offset;
}

void nsNativeAppSupportOS2::ParseDDEArg( const char* args, int index, nsCString& aString) {
    if ( args ) {
        int argLen = strlen(args);
        nsDependentCString temp(args, argLen);

        // offset points to the comma preceding the desired arg.
        PRInt32 offset = -1;
        // Skip commas till we get to the arg we want.
        while( index-- ) {
            // If this arg is quoted, then go to closing quote.
            offset = advanceToEndOfQuotedArg( args, offset, argLen);
            // Find next comma.
            offset = temp.FindChar( ',', offset );
            if ( offset == kNotFound ) {
                // No more commas, give up.
                aString = args;
                return;
            }
        }
        // The desired argument starts just past the preceding comma,
        // which offset points to, and extends until the following
        // comma (or the end of the string).
        //
        // Since the argument might be enclosed in quotes, we need to
        // deal with that before searching for the terminating comma.
        // We advance offset so it ends up pointing to the start of
        // the argument we want.
        PRInt32 end = advanceToEndOfQuotedArg( args, offset++, argLen );
        // Find next comma (or end of string).
        end = temp.FindChar( ',', end );
        if ( end == kNotFound ) {
            // Arg is the rest of the string.
            end = argLen;
        }
        // Extract result.
        aString.Assign( args + offset, end - offset );
    }
    return;
}

// Utility to parse out argument from a DDE item string.
void nsNativeAppSupportOS2::ParseDDEArg( HSZ args, int index, nsCString& aString) {
    DWORD argLen = WinDdeQueryString( args, NULL, NULL, CP_WINANSI );
    // there wasn't any string, so return empty string
    if ( !argLen ) return;
    nsCAutoString temp;
    // Ensure result's buffer is sufficiently big.
    temp.SetLength( argLen );
    // Now get the string contents.
    WinDdeQueryString( args, temp.BeginWriting(), temp.Length(), CP_WINANSI );
    // Parse out the given arg.
    ParseDDEArg(temp.get(), index, aString);
    return;
}

void nsNativeAppSupportOS2::ActivateLastWindow() {
    nsCOMPtr<nsIDOMWindowInternal> navWin;
    GetMostRecentWindow( NS_LITERAL_STRING("navigator:browser").get(), getter_AddRefs( navWin ) );
    if ( navWin )
        // Activate that window.
        activateWindow( navWin );
    else
        // Need to create a Navigator window, then.
        OpenBrowserWindow();
}

HDDEDATA nsNativeAppSupportOS2::CreateDDEData( DWORD value ) {
    return CreateDDEData( (LPBYTE)&value, sizeof value );
}

HDDEDATA nsNativeAppSupportOS2::CreateDDEData( LPBYTE value, DWORD len ) {
    HDDEDATA result = WinDdeCreateDataHandle( value,
                                              len,
                                              0,
                                              mApplication,
                                              CF_TEXT,
                                              0 );
    return result;
}


void
nsNativeAppSupportOS2::HandleCommandLine(const char* aCmdLineString,
                                         nsIFile* aWorkingDir,
                                         PRUint32 aState)
{
    nsresult rv;

    int justCounting = 1;
    char **argv = 0;
    // Flags, etc.
    int init = 1;
    int between, quoted, bSlashCount;
    int argc;
    const char *p;
    nsCAutoString arg;

    nsCOMPtr<nsICommandLineRunner> cmdLine
        (do_CreateInstance("@mozilla.org/toolkit/command-line;1"));
    if (!cmdLine) {
        NS_ERROR("Couldn't create command line!");
        return;
    }

    // We loop if we've not finished the second pass through.
    while ( 1 ) {
        // Initialize if required.
        if ( init ) {
            p = aCmdLineString;
            between = 1;
            argc = quoted = bSlashCount = 0;

            init = 0;
        }
        if ( between ) {
            // We are traversing whitespace between args.
            // Check for start of next arg.
            if (  *p != 0 && !isspace( *p ) ) {
                // Start of another arg.
                between = 0;
                arg = "";
                switch ( *p ) {
                    case '\\':
                        // Count the backslash.
                        bSlashCount = 1;
                        break;
                    case '"':
                        // Remember we're inside quotes.
                        quoted = 1;
                        break;
                    default:
                        // Add character to arg.
                        arg += *p;
                        break;
                }
            } else {
                // Another space between args, ignore it.
            }
        } else {
            // We are processing the contents of an argument.
            // Check for whitespace or end.

            // if the argument we are parsing is a mailto url then all
            // of the remaining command line data needs to be part of
            // the mailto url even if it has spaces. See Bug #231032
            nsDependentCString mailtoUrlScheme (kMailtoUrlScheme);

            if ( *p == 0 || ( !quoted && isspace( *p ) && !StringBeginsWith(arg, mailtoUrlScheme, nsCaseInsensitiveCStringComparator()) ) ) {
                // Process pending backslashes (interpret them
                // literally since they're not followed by a ").
                while( bSlashCount ) {
                    arg += '\\';
                    bSlashCount--;
                }
                // End current arg.
                if ( !justCounting ) {
                    argv[argc] = new char[ arg.Length() + 1 ];
                    strcpy( argv[argc], arg.get() );
                }
                argc++;
                // We're now between args.
                between = 1;
            } else {
                // Still inside argument, process the character.
                switch ( *p ) {
                    case '"':
                        // First, digest preceding backslashes (if any).
                        while ( bSlashCount > 1 ) {
                            // Put one backsplash in arg for each pair.
                            arg += '\\';
                            bSlashCount -= 2;
                        }
                        if ( bSlashCount ) {
                            // Quote is literal.
                            arg += '"';
                            bSlashCount = 0;
                        } else {
                            // Quote starts or ends a quoted section.
                            if ( quoted ) {
                                // Check for special case of consecutive double
                                // quotes inside a quoted section.
                                if ( *(p+1) == '"' ) {
                                    // This implies a literal double-quote.  Fake that
                                    // out by causing next double-quote to look as
                                    // if it was preceded by a backslash.
                                    bSlashCount = 1;
                                } else {
                                    quoted = 0;
                                }
                            } else {
                                quoted = 1;
                            }
                        }
                        break;
                    case '\\':
                        // Add to count.
                        bSlashCount++;
                        break;
                    default:
                        // Accept any preceding backslashes literally.
                        while ( bSlashCount ) {
                            arg += '\\';
                            bSlashCount--;
                        }
                        // Just add next char to the current arg.
                        arg += *p;
                        break;
                }
            }
        }
        // Check for end of input.
        if ( *p ) {
            // Go to next character.
            p++;
        } else {
            // If on first pass, go on to second.
            if ( justCounting ) {
                // Allocate argv array.
                argv = new char*[ argc ];

                // Start second pass
                justCounting = 0;
                init = 1;
            } else {
                // Quit.
                break;
            }
        }
    }

    rv = cmdLine->Init(argc, argv, aWorkingDir, aState);

    // if these OS/2-specific flags aren't removed,
    // any URL following them will be ignored
    PRBool found;
    cmdLine->HandleFlag(NS_LITERAL_STRING("console"), PR_FALSE, &found);
    cmdLine->HandleFlag(NS_LITERAL_STRING("dde"), PR_FALSE, &found);

    // Cleanup.
    while ( argc ) {
        delete [] argv[ --argc ];
    }
    delete [] argv;

    if (NS_FAILED(rv)) {
        NS_ERROR("Error initializing command line.");
        return;
    }

    cmdLine->Run();
}


nsresult
nsNativeAppSupportOS2::OpenWindow( const char*urlstr, const char *args ) {

  nsresult rv = NS_ERROR_FAILURE;

  nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID));
  nsCOMPtr<nsISupportsCString> sarg(do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
  if (sarg)
    sarg->SetData(nsDependentCString(args));

  if (wwatch && sarg) {
    nsCOMPtr<nsIDOMWindow> newWindow;
    rv = wwatch->OpenWindow(0, urlstr, "_blank", "chrome,dialog=no,all",
                   sarg, getter_AddRefs(newWindow));
#if MOZ_DEBUG_DDE
  } else {
      printf("Get WindowWatcher (or create string) failed\n");
#endif
  }
  return rv;
}

HWND hwndForDOMWindow( nsISupports *window ) {
    nsCOMPtr<nsPIDOMWindow> pidomwindow( do_QueryInterface(window) );
    if ( !pidomwindow ) {
        return 0;
    }

    nsCOMPtr<nsIBaseWindow> ppBaseWindow =
        do_QueryInterface( pidomwindow->GetDocShell() );
    if ( !ppBaseWindow ) {
        return 0;
    }

    nsCOMPtr<nsIWidget> ppWidget;
    ppBaseWindow->GetMainWidget( getter_AddRefs( ppWidget ) );

    return (HWND)( ppWidget->GetNativeData( NS_NATIVE_WIDGET ) );
}

static const char sJSStackContractID[] = "@mozilla.org/js/xpc/ContextStack;1";

class SafeJSContext {
public:
  SafeJSContext();
  ~SafeJSContext();

  nsresult   Push();
  JSContext *get() { return mContext; }

protected:
  nsCOMPtr<nsIThreadJSContextStack>  mService;
  JSContext                         *mContext;
};

SafeJSContext::SafeJSContext() : mContext(nsnull) {
}

SafeJSContext::~SafeJSContext() {
  JSContext *cx;
  nsresult   rv;

  if(mContext) {
    rv = mService->Pop(&cx);
    NS_ASSERTION(NS_SUCCEEDED(rv) && cx == mContext, "JSContext push/pop mismatch");
  }
}

nsresult SafeJSContext::Push() {
  if (mContext) // only once
    return NS_ERROR_FAILURE;

  mService = do_GetService(sJSStackContractID);
  if(mService) {
    JSContext *cx;
    if (NS_SUCCEEDED(mService->GetSafeJSContext(&cx)) &&
        cx &&
        NS_SUCCEEDED(mService->Push(cx))) {
      // Save cx in mContext to indicate need to pop.
      mContext = cx;
    }
  }
  return mContext ? NS_OK : NS_ERROR_FAILURE;
}


// As of Jan, 2005, most of the code in this method is pointless and
// will never be used.  It is only called by ActivateLastWindow() and
// only when there is no existing window.  Consequently, the first test
// below [if ( !navWin )] will always fail, bypassing everything in the
// dummy do..while() loop.  Given that this file is largely a port of
// the Win32 version, it is left in place to maintain concurrency.

nsresult
nsNativeAppSupportOS2::OpenBrowserWindow()
{
    nsresult rv = NS_OK;

    // Open the argument URL in the most recently used Navigator window.
    // If there is no Nav window, open a new one.

    // If at all possible, hand the request off to the most recent
    // browser window.

    nsCOMPtr<nsIDOMWindowInternal> navWin;
    GetMostRecentWindow( NS_LITERAL_STRING( "navigator:browser" ).get(), getter_AddRefs( navWin ) );

    // This isn't really a loop.  We just use "break" statements to fall
    // out to the OpenWindow call when things go awry.
    do {
        // If caller requires a new window, then don't use an existing one.
        if ( !navWin ) {
            // Have to open a new one.
            break;
        }

        nsCOMPtr<nsIBrowserDOMWindow> bwin;
        { // scope a bunch of temporary cruft used to generate bwin
          nsCOMPtr<nsIWebNavigation> navNav( do_GetInterface( navWin ) );
          nsCOMPtr<nsIDocShellTreeItem> navItem( do_QueryInterface( navNav ) );
          if ( navItem ) {
            nsCOMPtr<nsIDocShellTreeItem> rootItem;
            navItem->GetRootTreeItem( getter_AddRefs( rootItem ) );
            nsCOMPtr<nsIDOMWindow> rootWin( do_GetInterface( rootItem ) );
            nsCOMPtr<nsIDOMChromeWindow> chromeWin(do_QueryInterface(rootWin));
            if ( chromeWin )
              chromeWin->GetBrowserDOMWindow( getter_AddRefs ( bwin ) );
          }
        }
        if ( bwin ) {
          nsCOMPtr<nsIURI> uri;
          NS_NewURI( getter_AddRefs( uri ), NS_LITERAL_CSTRING("about:blank"), 0, 0 );
          if ( uri ) {
            nsCOMPtr<nsIDOMWindow> container;
            rv = bwin->OpenURI( uri, 0,
                                nsIBrowserDOMWindow::OPEN_DEFAULTWINDOW,
                                nsIBrowserDOMWindow::OPEN_EXTERNAL,
                                getter_AddRefs( container ) );
            if ( NS_SUCCEEDED( rv ) )
              return NS_OK;
          }
        }

        NS_ERROR("failed to hand off external URL to extant window\n");
    } while ( PR_FALSE );

    // open a new window if caller requested it or if anything above failed

    char* argv[] = { 0 };
    nsCOMPtr<nsICommandLineRunner> cmdLine
        (do_CreateInstance("@mozilla.org/toolkit/command-line;1"));
    NS_ENSURE_TRUE(cmdLine, NS_ERROR_FAILURE);

    rv = cmdLine->Init(0, argv, nsnull, nsICommandLine::STATE_REMOTE_EXPLICIT);
    NS_ENSURE_SUCCESS(rv, rv);

    return cmdLine->Run();
}

// This is a public function called by nsAppRunner.cpp.  Its primary
// purpose is to determine if any commandline options require a VIO
// ("console") window.  If so and one isn't present, it will restart
// the app in a VIO session.  It is intended to be called as early as
// possible during startup and before any other commandline processing.
// It returns TRUE if the current instance should continue running and
// FALSE if it should terminate upon this function's return.

PRBool     StartOS2App(int aArgc, char **aArgv)
{
  PRBool    rv = PR_TRUE;
  PPIB      ppib;
  PTIB      ptib;

  DosGetInfoBlocks(&ptib, &ppib);

  // if this isn't a PM session, reset the session type to enable use
  // of PM functions;  if it is PM, see if a VIO session is required
  if (ppib->pib_ultype != SSF_TYPE_PM)
    ppib->pib_ultype = SSF_TYPE_PM;
  else {
    for (int i = 1; i < aArgc; i++ ) {
      char *arg = aArgv[i];
      if (*arg != '-' && *arg != '/')
        continue;
      arg++;
      if (stricmp("?", arg) == 0 ||
        stricmp("h", arg) == 0 ||
        stricmp("v", arg) == 0 ||
        stricmp("help", arg) == 0 ||
        stricmp("version", arg) == 0 ||
        stricmp("console", arg) == 0) {
        rv = PR_FALSE;
        break;
      }
    }
  }

  // if the session type is OK, increase the number of 
  // file handles available to the app, then exit
  if (rv) {
    ULONG    ulMaxFH = 0;
    LONG     ulReqCount = 0;

    DosSetRelMaxFH(&ulReqCount, &ulMaxFH);
    if (ulMaxFH < 256)
      DosSetMaxFH(256);

    return rv;
  }

  // the app has to be restarted in a VIO session
  char        szErrObj[64] = "";
  STARTDATA   x;

  memset(&x, 0, sizeof(x));
  x.Length = sizeof(x);
  x.PgmTitle = (PSZ)gAppData->name;
  x.InheritOpt = SSF_INHERTOPT_PARENT;
  x.SessionType = SSF_TYPE_WINDOWABLEVIO;
  x.PgmControl = SSF_CONTROL_NOAUTOCLOSE;
  x.ObjectBuffer = szErrObj;
  x.ObjectBuffLen = sizeof(szErrObj);

  // the f/q exename is the string preceding ppib->pib_pchcmd;
  // the original commandline is the string following it
  char * ptr = ppib->pib_pchcmd - 2;
  while (*ptr)
    ptr--;
  x.PgmName = ptr + 1;
  x.PgmInputs = strchr(ppib->pib_pchcmd, 0) + 1;

  // restart the app;  if this session is in the background, trying
  // to start in the foreground will produce an error, but the app
  // will still start; if DosStartSession has a real failure, forget
  // the console and let the current instance keep running
  ULONG ulSession;
  PID   pid;
  ULONG rc = DosStartSession(&x, &ulSession, &pid);
  if (rc && rc != ERROR_SMG_START_IN_BACKGROUND)
    rv = PR_TRUE;

  return rv;
}