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/*
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 * DOS interrupt 21h handler
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 */

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#include <time.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_SYS_FILE_H
# include <sys/file.h>
#endif
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#include <string.h>
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#include <sys/time.h>
#include <sys/types.h>
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#include <unistd.h>
#include <utime.h>
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#include <ctype.h>
#include "windef.h"
#include "winbase.h"
#include "winuser.h" /* SW_NORMAL */
#include "wine/winbase16.h"
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#include "drive.h"
#include "file.h"
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#include "msdos.h"
#include "options.h"
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#include "miscemu.h"
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#if defined(__svr4__) || defined(_SCO_DS)
/* SVR4 DOESNT do locking the same way must implement properly */
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#define LOCK_EX 0
#define LOCK_SH  1
#define LOCK_NB  8
#endif
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#define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())

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/* Define the drive parameter block, as used by int21/1F
 * and int21/32.  This table can be accessed through the
 * global 'dpb' pointer, which points into the local dos
 * heap.
 */
struct DPB
{
    BYTE drive_num;         /* 0=A, etc. */
    BYTE unit_num;          /* Drive's unit number (?) */
    WORD sector_size;       /* Sector size in bytes */
    BYTE high_sector;       /* Highest sector in a cluster */
    BYTE shift;             /* Shift count (?) */
    WORD reserved;          /* Number of reserved sectors at start */
    BYTE num_FAT;           /* Number of FATs */
    WORD dir_entries;       /* Number of root dir entries */
    WORD first_data;        /* First data sector */
    WORD high_cluster;      /* Highest cluster number */
    WORD sectors_in_FAT;    /* Number of sectors per FAT */
    WORD start_dir;         /* Starting sector of first dir */
    DWORD driver_head;      /* Address of device driver header (?) */
    BYTE media_ID;          /* Media ID */
    BYTE access_flag;       /* Prev. accessed flag (0=yes,0xFF=no) */
    DWORD next;             /* Pointer to next DPB in list */
    WORD free_search;       /* Free cluster search start */
    WORD free_clusters;     /* Number of free clusters (0xFFFF=unknown) */
};

struct EDPB			/* FAT32 extended Drive Parameter Block */
{				/* from Ralf Brown's Interrupt List */
	struct DPB dpb;		/* first 24 bytes = original DPB */

	BYTE edpb_flags;	/* undocumented/unknown flags */
	DWORD next_edpb;	/* pointer to next EDPB */
	WORD free_cluster;	/* cluster to start search for free space on write, typically
	                           the last cluster allocated */
	WORD clusters_free;	/* number of free clusters on drive or FFFF = unknown */
	WORD clusters_free_hi;	/* hiword of clusters_free */
	WORD mirroring_flags;	/* mirroring flags: bit 7 set = do not mirror active FAT */
				/* bits 0-3 = 0-based number of the active FAT */
	WORD info_sector;	/* sector number of file system info sector, or FFFF for none */
	WORD spare_boot_sector;	/* sector number of backup boot sector, or FFFF for none */
	DWORD first_cluster;	/* sector number of the first cluster */
	DWORD max_cluster;	/* sector number of the last cluster */
	DWORD fat_clusters;	/* number of clusters occupied by FAT */
	DWORD root_cluster;	/* cluster number of start of root directory */
	DWORD free_cluster2;	/* same as free_cluster: cluster at which to start
	                           search for free space when writing */

};

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WORD CodePage = 437;
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DWORD dpbsegptr;
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struct DosHeap {
	BYTE InDosFlag;
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        BYTE mediaID;
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	BYTE biosdate[8];
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        struct DPB dpb;
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};
static struct DosHeap *heap;
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static WORD DosHeapHandle;
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extern char TempDirectory[];
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static void INT21_ReadConfigSys(void)
{
    static int done;
    if (!done) DOSCONF_ReadConfig();
    done = 1;
}

static BOOL INT21_CreateHeap(void)
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{
    if (!(DosHeapHandle = GlobalAlloc16(GMEM_FIXED,sizeof(struct DosHeap))))
    {
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        return FALSE;
    }
    heap = (struct DosHeap *) GlobalLock16(DosHeapHandle);
    dpbsegptr = MAKESEGPTR(DosHeapHandle,(int)&heap->dpb-(int)heap);
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    heap->InDosFlag = 0;
    strcpy(heap->biosdate, "01/01/80");
    memset(heap->DummyDBCSLeadTable, 0, 6);
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    return TRUE;
}

static BYTE *GetCurrentDTA( CONTEXT86 *context )
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{
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    /* FIXME: This assumes DTA was set correctly! */
    return (BYTE *)CTX_SEG_OFF_TO_LIN( context, SELECTOROF(pTask->dta), 
                                                (DWORD)OFFSETOF(pTask->dta) );
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void CreateBPB(int drive, BYTE *data, BOOL16 limited)
/* limited == TRUE is used with INT 0x21/0x440d */
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{
	if (drive > 1) {
		setword(data, 512);
		data[2] = 2;
		setword(&data[3], 0);
		data[5] = 2;
		setword(&data[6], 240);
		setword(&data[8], 64000);
		data[0x0a] = 0xf8;
		setword(&data[0x0b], 40);
		setword(&data[0x0d], 56);
		setword(&data[0x0f], 2);
		setword(&data[0x11], 0);
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		if (!limited) {
		    setword(&data[0x1f], 800);
		    data[0x21] = 5;
		    setword(&data[0x22], 1);
		}
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	} else { /* 1.44mb */
		setword(data, 512);
		data[2] = 2;
		setword(&data[3], 0);
		data[5] = 2;
		setword(&data[6], 240);
		setword(&data[8], 2880);
		data[0x0a] = 0xf8;
		setword(&data[0x0b], 6);
		setword(&data[0x0d], 18);
		setword(&data[0x0f], 2);
		setword(&data[0x11], 0);
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		if (!limited) {
		    setword(&data[0x1f], 80);
		    data[0x21] = 7;
		    setword(&data[0x22], 2);
		}
static int INT21_GetFreeDiskSpace( CONTEXT86 *context )
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{
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    DWORD cluster_sectors, sector_bytes, free_clusters, total_clusters;
    char root[] = "A:\\";

    *root += DOS_GET_DRIVE( DL_reg(context) );
    if (!GetDiskFreeSpaceA( root, &cluster_sectors, &sector_bytes,
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                              &free_clusters, &total_clusters )) return 0;
    AX_reg(context) = cluster_sectors;
    BX_reg(context) = free_clusters;
    CX_reg(context) = sector_bytes;
    DX_reg(context) = total_clusters;
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    return 1;
static int INT21_GetDriveAllocInfo( CONTEXT86 *context )
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{
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    if (!INT21_GetFreeDiskSpace( context )) return 0;
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    if (!heap && !INT21_CreateHeap()) return 0;
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    heap->mediaID = 0xf0;
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    BX_reg(context) = (int)&heap->mediaID - (int)heap;
    return 1;
static int FillInDrivePB( int drive )
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{
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        if(!DRIVE_IsValid(drive))
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        {
            SetLastError( ERROR_INVALID_DRIVE );
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        }
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        else if (heap || INT21_CreateHeap())
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        {
                /* FIXME: I have no idea what a lot of this information should
                 * say or whether it even really matters since we're not allowing
                 * direct block access.  However, some programs seem to depend on
                 * getting at least _something_ back from here.  The 'next' pointer
                 * does worry me, though.  Should we have a complete table of
                 * separate DPBs per drive?  Probably, but I'm lazy. :-)  -CH
                 */
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                heap->dpb.drive_num = heap->dpb.unit_num = drive; /*The same?*/
                heap->dpb.sector_size = 512;
                heap->dpb.high_sector = 1;
                heap->dpb.shift = drive < 2 ? 0 : 6; /*6 for HD, 0 for floppy*/
                heap->dpb.reserved = 0;
                heap->dpb.num_FAT = 1;
                heap->dpb.dir_entries = 2;
                heap->dpb.first_data = 2;
                heap->dpb.high_cluster = 64000;
                heap->dpb.sectors_in_FAT = 1;
                heap->dpb.start_dir = 1;
                heap->dpb.driver_head = 0;
                heap->dpb.media_ID = (drive > 1) ? 0xF8 : 0xF0;
                heap->dpb.access_flag = 0;
                heap->dpb.next = 0;
                heap->dpb.free_search = 0;
                heap->dpb.free_clusters = 0xFFFF;    /* unknown */
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		return 0;
}

static void GetDrivePB( CONTEXT86 *context, int drive )
{
	if (FillInDrivePB( drive ))
	{
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                AL_reg(context) = 0x00;
                context->SegDs = SELECTOROF(dpbsegptr);
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                BX_reg(context) = OFFSETOF(dpbsegptr);
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        }
	else
	{
        AX_reg(context) = 0x00ff;
	}
static void ioctlGetDeviceInfo( CONTEXT86 *context )
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{
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    int curr_drive;
    const DOS_DEVICE *dev;
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    RESET_CFLAG(context);

    /* DOS device ? */
    if ((dev = DOSFS_GetDeviceByHandle( DosFileHandleToWin32Handle(BX_reg(context)) )))
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    {
        DX_reg(context) = dev->flags;
        return;
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    }

    /* it seems to be a file */
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    curr_drive = DRIVE_GetCurrentDrive();
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    DX_reg(context) = 0x0140 + curr_drive + ((curr_drive > 1) ? 0x0800 : 0); 
    /* no floppy */
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    /* bits 0-5 are current drive
     * bit 6 - file has NOT been written..FIXME: correct?
     * bit 8 - generate int24 if no diskspace on write/ read past end of file
     * bit 11 - media not removable
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     * bit 14 - don't set file date/time on closing
     * bit 15 - file is remote
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     */
static BOOL ioctlGenericBlkDevReq( CONTEXT86 *context )
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{
	BYTE *dataptr = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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	int drive = DOS_GET_DRIVE( BL_reg(context) );
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	if (!DRIVE_IsValid(drive))
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        {
            SetLastError( ERROR_FILE_NOT_FOUND );
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            return TRUE;
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	if (CH_reg(context) != 0x08)
        {
            INT_BARF( context, 0x21 );
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            return FALSE;
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	}
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	switch (CL_reg(context)) 
	{
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		case 0x4a: /* lock logical volume */
			TRACE("lock logical volume (%d) level %d mode %d\n",drive,BH_reg(context),DX_reg(context));
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			break;

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		case 0x60: /* get device parameters */
			   /* used by w4wgrp's winfile */
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			memset(dataptr, 0, 0x20); /* DOS 6.22 uses 0x20 bytes */
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			dataptr[0] = 0x04;
			dataptr[6] = 0; /* media type */
			if (drive > 1) 
			{
				dataptr[1] = 0x05; /* fixed disk */
				setword(&dataptr[2], 0x01); /* non removable */
				setword(&dataptr[4], 0x300); /* # of cylinders */
			}
			else
			{
				dataptr[1] = 0x07; /* block dev, floppy */
				setword(&dataptr[2], 0x02); /* removable */
				setword(&dataptr[4], 80); /* # of cylinders */
			}
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			CreateBPB(drive, &dataptr[7], TRUE);
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			RESET_CFLAG(context);
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			break;

		case 0x41: /* write logical device track */
		case 0x61: /* read logical device track */
			{
				BYTE drive = BL_reg(context) ?
						BL_reg(context) : DRIVE_GetCurrentDrive(); 
				WORD head   = *(WORD *)dataptr+1;
				WORD cyl    = *(WORD *)dataptr+3;
				WORD sect   = *(WORD *)dataptr+5;
				WORD nrsect = *(WORD *)dataptr+7;
				BYTE *data  =  (BYTE *)dataptr+9;
				int (*raw_func)(BYTE, DWORD, DWORD, BYTE *, BOOL);

				raw_func = (CL_reg(context) == 0x41) ?
								DRIVE_RawWrite : DRIVE_RawRead;

				if (raw_func(drive, head*cyl*sect, nrsect, data, FALSE))
					RESET_CFLAG(context);
				else
				{
					AX_reg(context) = 0x1e; /* read fault */
					SET_CFLAG(context);
				}
			}
			break;
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		case 0x66:/*  get disk serial number */
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			{	
				char	label[12],fsname[9],path[4];
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				DWORD	serial;

				strcpy(path,"x:\\");path[0]=drive+'A';
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					path,label,12,&serial,NULL,NULL,fsname,9
				);
				*(WORD*)dataptr		= 0;
				memcpy(dataptr+2,&serial,4);
				memcpy(dataptr+6,label	,11);
				memcpy(dataptr+17,fsname,8);
			}
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			break;

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		case 0x6a:
			TRACE("logical volume %d unlocked.\n",drive);
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			break;

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		case 0x6f:
			memset(dataptr+1, '\0', dataptr[0]-1);
			dataptr[1] = dataptr[0]; 
			dataptr[2] = 0x07; /* protected mode driver; no eject; no notification */
			dataptr[3] = 0xFF; /* no physical drive */
			break;

		case 0x72:
			/* Trail on error implementation */
			AX_reg(context) = GetDriveType16(BL_reg(context)) == DRIVE_UNKNOWN ? 0x0f : 0x01;
			SET_CFLAG(context);	/* Seems to be set all the time */
			break;

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		default:
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                        INT_BARF( context, 0x21 );
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	}
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	return FALSE;
static void INT21_ParseFileNameIntoFCB( CONTEXT86 *context )
        CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Esi );
        CTX_SEG_OFF_TO_LIN(context, context->SegEs, context->Edi );
    char *buffer, *s, *d;

    AL_reg(context) = 0xff; /* failed */

    TRACE("filename: '%s'\n", filename);
    buffer = HeapAlloc( GetProcessHeap(), 0, strlen(filename) + 1);

    s = filename;
    d = buffer;
    while (*s)
    {
        if ((*s != ' ') && (*s != '\r') && (*s != '\n'))
            *d++ = *s++;
        else
            break;
    }

    *d = '\0';
    DOSFS_ToDosFCBFormat(buffer, fcb + 1);
    *fcb = 0;
    TRACE("FCB: '%s'\n", ((CHAR *)fcb + 1));

    HeapFree( GetProcessHeap(), 0, buffer);

    AL_reg(context) =
        ((strchr(filename, '*')) || (strchr(filename, '$'))) != 0;

    /* point DS:SI to first unparsed character */
    SI_reg(context) += (int)s - (int)filename;
}

static void INT21_GetSystemDate( CONTEXT86 *context )
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{
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    SYSTEMTIME systime;
    GetLocalTime( &systime );
    CX_reg(context) = systime.wYear;
    DX_reg(context) = (systime.wMonth << 8) | systime.wDay;
    AX_reg(context) = systime.wDayOfWeek;
static void INT21_GetSystemTime( CONTEXT86 *context )
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{
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    SYSTEMTIME systime;
    GetLocalTime( &systime );
    CX_reg(context) = (systime.wHour << 8) | systime.wMinute;
    DX_reg(context) = (systime.wSecond << 8) | (systime.wMilliseconds / 10);
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/* Many calls translate a drive argument like this:
   drive number (00h = default, 01h = A:, etc)
   */  
static char drivestring[]="default";

char *INT21_DriveName(int drive)
{

    if(drive >0)
      {
	drivestring[0]= (unsigned char)drive + '@';
	drivestring[1]=':';
	drivestring[2]=0;
      }
    return drivestring;
}
static BOOL INT21_CreateFile( CONTEXT86 *context )
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{
    AX_reg(context) = _lcreat16( CTX_SEG_OFF_TO_LIN(context, context->SegDs,
                                          context->Edx ), CX_reg(context) );
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    return (AX_reg(context) == (WORD)HFILE_ERROR16);
static HFILE16 _lcreat16_uniq( LPCSTR path, INT attr )
{
    /* Mask off all flags not explicitly allowed by the doc */
    attr &= FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM;
    return Win32HandleToDosFileHandle( CreateFileA( path, GENERIC_READ | GENERIC_WRITE,
                                             FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                                             CREATE_NEW, attr, 0 ));
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static void OpenExistingFile( CONTEXT86 *context )
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{
    AX_reg(context) = _lopen16( CTX_SEG_OFF_TO_LIN(context, context->SegDs,context->Edx),
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                               AL_reg(context) );
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    if (AX_reg(context) == (WORD)HFILE_ERROR16)
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    {
        AX_reg(context) = GetLastError();
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        SET_CFLAG(context);
    }
static BOOL INT21_ExtendedOpenCreateFile(CONTEXT86 *context )
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{
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  BYTE action = DL_reg(context);

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  /* Shuffle arguments to call OpenExistingFile */
  AL_reg(context) = BL_reg(context);
  DX_reg(context) = SI_reg(context);
  /* BX,CX and DX should be preserved */
  OpenExistingFile(context);
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  if ((context->EFlags & 0x0001) == 0) /* File exists */
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  {
      UINT16	uReturnCX = 0;

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      /* Now decide what do do */
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      if ((action & 0x07) == 0)
      {
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	  AX_reg(context) = 0x0050;	/*File exists*/
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	  SET_CFLAG(context);
	  WARN("extended open/create: failed because file exists \n");
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      }
      else if ((action & 0x07) == 2) 
      {
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	/* Truncate it, but first check if opened for write */
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	if ((BL_reg(context) & 0x0007)== 0) 
	{
            WARN("extended open/create: failed, trunc on ro file\n");
            AX_reg(context) = 0x000C;	/*Access code invalid*/
            SET_CFLAG(context);
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	}
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	else
	{
		TRACE("extended open/create: Closing before truncate\n");
                if (_lclose16( AX_reg(context) ))
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		{
		   WARN("extended open/create: close before trunc failed\n");
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		   AX_reg(context) = 0x0019;	/*Seek Error*/
		   CX_reg(context) = 0;
		   SET_CFLAG(context);
		}
		/* Shuffle arguments to call CreateFile */

		TRACE("extended open/create: Truncating\n");
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		AL_reg(context) = BL_reg(context);
		/* CX is still the same */
		DX_reg(context) = SI_reg(context);
		bExtendedError = INT21_CreateFile(context);

		if (context->EFlags & 0x0001) 	/*no file open, flags set */
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		{
		    WARN("extended open/create: trunc failed\n");
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		    return bExtendedError;
		}
		uReturnCX = 0x3;
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	}
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      } 
      else uReturnCX = 0x1;

      CX_reg(context) = uReturnCX;
  }
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  else /* file does not exist */
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  {
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      RESET_CFLAG(context); /* was set by OpenExistingFile(context) */
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      if ((action & 0xF0)== 0)
      {
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	CX_reg(context) = 0;
	SET_CFLAG(context);
	WARN("extended open/create: failed, file dosen't exist\n");
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      }
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      else
      {
        /* Shuffle arguments to call CreateFile */
        TRACE("extended open/create: Creating\n");
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        AL_reg(context) = BL_reg(context);
        /* CX should still be the same */
        DX_reg(context) = SI_reg(context);
        bExtendedError = INT21_CreateFile(context);
        if (context->EFlags & 0x0001)  /*no file open, flags set */
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	{
  	    WARN("extended open/create: create failed\n");
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	    return bExtendedError;
        }
        CX_reg(context) = 2;
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      }
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  }

  return bExtendedError;
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}
static BOOL INT21_ChangeDir( CONTEXT86 *context )
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{
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    int drive;
    char *dirname = CTX_SEG_OFF_TO_LIN(context, context->SegDs,context->Edx);
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    if (dirname[0] && (dirname[1] == ':'))
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    {
        drive = toupper(dirname[0]) - 'A';
        dirname += 2;
    }
    else drive = DRIVE_GetCurrentDrive();
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    return DRIVE_Chdir( drive, dirname );
static int INT21_FindFirst( CONTEXT86 *context )
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{
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    char *p;
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    const char *path;
    DOS_FULL_NAME full_name;
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    FINDFILE_DTA *dta = (FINDFILE_DTA *)GetCurrentDTA(context);
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    path = (const char *)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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    dta->unixPath = NULL;
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    if (!DOSFS_GetFullName( path, FALSE, &full_name ))
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    {
        AX_reg(context) = GetLastError();
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        SET_CFLAG(context);
        return 0;
    }
    dta->unixPath = HeapAlloc( GetProcessHeap(), 0, strlen(full_name.long_name)+1 );
    strcpy( dta->unixPath, full_name.long_name );
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    p = strrchr( dta->unixPath, '/' );
    *p = '\0';
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    /* Note: terminating NULL in dta->mask overwrites dta->search_attr
     *       (doesn't matter as it is set below anyway)
     */
    if (!DOSFS_ToDosFCBFormat( p + 1, dta->mask ))
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    {
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        HeapFree( GetProcessHeap(), 0, dta->unixPath );
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        dta->unixPath = NULL;
        SetLastError( ERROR_FILE_NOT_FOUND );
        AX_reg(context) = ERROR_FILE_NOT_FOUND;
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        SET_CFLAG(context);
        return 0;
    }
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    dta->drive = (path[0] && (path[1] == ':')) ? toupper(path[0]) - 'A'
                                               : DRIVE_GetCurrentDrive();
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    dta->count = 0;
    dta->search_attr = CL_reg(context);
    return 1;
static int INT21_FindNext( CONTEXT86 *context )
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{
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    FINDFILE_DTA *dta = (FINDFILE_DTA *)GetCurrentDTA(context);
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    int count;
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    if (!dta->unixPath) return 0;
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    if (!(count = DOSFS_FindNext( dta->unixPath, dta->mask, NULL, dta->drive,
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                                  dta->search_attr, dta->count, &entry )))
    {
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        HeapFree( GetProcessHeap(), 0, dta->unixPath );
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        dta->unixPath = NULL;
        return 0;
    }
    if ((int)dta->count + count > 0xffff)
    {
        WARN("Too many directory entries in %s\n", dta->unixPath );
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        HeapFree( GetProcessHeap(), 0, dta->unixPath );
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        dta->unixPath = NULL;
        return 0;
    }
    dta->count += count;
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    dta->fileattr = entry.dwFileAttributes;
    dta->filesize = entry.nFileSizeLow;
    FileTimeToDosDateTime( &entry.ftLastWriteTime,
                           &dta->filedate, &dta->filetime );
    strcpy( dta->filename, entry.cAlternateFileName );
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    if (!memchr(dta->mask,'?',11)) {
	/* wildcardless search, release resources in case no findnext will
	 * be issued, and as a workaround in case file creation messes up
	 * findnext, as sometimes happens with pkunzip */
        HeapFree( GetProcessHeap(), 0, dta->unixPath );
        dta->unixPath = NULL;
    }
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    return 1;
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static BOOL INT21_CreateTempFile( CONTEXT86 *context )
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{
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    static int counter = 0;
    char *name = CTX_SEG_OFF_TO_LIN(context,  context->SegDs, context->Edx );
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    char *p = name + strlen(name);
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    /* despite what Ralf Brown says, some programs seem to call without 
     * ending backslash (DOS accepts that, so we accept it too) */
    if ((p == name) || (p[-1] != '\\')) *p++ = '\\';

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    for (;;)
    {
        sprintf( p, "wine%04x.%03d", (int)getpid(), counter );
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        counter = (counter + 1) % 1000;
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        if ((AX_reg(context) = _lcreat16_uniq( name, 0 )) != (WORD)HFILE_ERROR16)
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        {
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            return TRUE;
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        }
        if (GetLastError() != ERROR_FILE_EXISTS) return FALSE;
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    }
static BOOL INT21_GetCurrentDirectory( CONTEXT86 *context ) 
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{
    int drive = DOS_GET_DRIVE( DL_reg(context) );
    char *ptr = (char *)CTX_SEG_OFF_TO_LIN(context,  context->SegDs, context->Esi );
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    if (!DRIVE_IsValid(drive))
    {
        SetLastError( ERROR_INVALID_DRIVE );
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        return FALSE;
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    }
    lstrcpynA( ptr, DRIVE_GetDosCwd(drive), 64 );
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    AX_reg(context) = 0x0100;			     /* success return code */
    return TRUE;
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static void INT21_GetDBCSLeadTable( CONTEXT86 *context )
{
    if (heap || INT21_CreateHeap())
    { /* return an empty table just as DOS 4.0+ does */
	SI_reg(context) = (int)&heap->DummyDBCSLeadTable - (int)heap;
    }
    else
    {
        AX_reg(context) = 0x1; /* error */
        SET_CFLAG(context);
    }
}


static int INT21_GetDiskSerialNumber( CONTEXT86 *context )
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{
    BYTE *dataptr = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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    int drive = DOS_GET_DRIVE( BL_reg(context) );
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    if (!DRIVE_IsValid(drive))
    {
        SetLastError( ERROR_INVALID_DRIVE );
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        return 0;
    }
    
    *(WORD *)dataptr = 0;
    *(DWORD *)(dataptr + 2) = DRIVE_GetSerialNumber( drive );
    memcpy( dataptr + 6, DRIVE_GetLabel( drive ), 11 );
    strncpy(dataptr + 0x11, "FAT16   ", 8);
    return 1;
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static int INT21_SetDiskSerialNumber( CONTEXT86 *context )
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{
    BYTE *dataptr = CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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    int drive = DOS_GET_DRIVE( BL_reg(context) );
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    if (!DRIVE_IsValid(drive))
    {
        SetLastError( ERROR_INVALID_DRIVE );
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        return 0;
    }
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    DRIVE_SetSerialNumber( drive, *(DWORD *)(dataptr + 2) );
    return 1;
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/* microsoft's programmers should be shot for using CP/M style int21
   calls in Windows for Workgroup's winfile.exe */

static int INT21_FindFirstFCB( CONTEXT86 *context )
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{
    BYTE *fcb = (BYTE *)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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    FINDFILE_FCB *pFCB;
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    LPCSTR root, cwd;
    int drive;
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    if (*fcb == 0xff) pFCB = (FINDFILE_FCB *)(fcb + 7);
    else pFCB = (FINDFILE_FCB *)fcb;
    drive = DOS_GET_DRIVE( pFCB->drive );
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    if (!DRIVE_IsValid( drive )) return 0;
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    root = DRIVE_GetRoot( drive );
    cwd  = DRIVE_GetUnixCwd( drive );
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    pFCB->unixPath = HeapAlloc( GetProcessHeap(), 0,
                                strlen(root)+strlen(cwd)+2 );
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    if (!pFCB->unixPath) return 0;
    strcpy( pFCB->unixPath, root );
    strcat( pFCB->unixPath, "/" );
    strcat( pFCB->unixPath, cwd );
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    pFCB->count = 0;
    return 1;
}
static int INT21_FindNextFCB( CONTEXT86 *context )
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{
    BYTE *fcb = (BYTE *)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx);
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    FINDFILE_FCB *pFCB;
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    DOS_DIRENTRY_LAYOUT *pResult = (DOS_DIRENTRY_LAYOUT *)GetCurrentDTA(context);
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    BYTE attr;
    int count;
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    if (*fcb == 0xff) /* extended FCB ? */
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    {
        attr = fcb[6];
        pFCB = (FINDFILE_FCB *)(fcb + 7);
    }
    else
    {
        attr = 0;
        pFCB = (FINDFILE_FCB *)fcb;
    }
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    if (!pFCB->unixPath) return 0;
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    if (!(count = DOSFS_FindNext( pFCB->unixPath, pFCB->filename, NULL,
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                                  DOS_GET_DRIVE( pFCB->drive ), attr,
                                  pFCB->count, &entry )))
    {
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        HeapFree( GetProcessHeap(), 0, pFCB->unixPath );
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        pFCB->unixPath = NULL;
        return 0;
    }
    pFCB->count += count;

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    if (*fcb == 0xff) { /* place extended FCB header before pResult if called with extended FCB */
	*(BYTE *)pResult = 0xff;
	(BYTE *)pResult +=6; /* leave reserved field behind */
	*(BYTE *)pResult = entry.dwFileAttributes;
	((BYTE *)pResult)++;
    }
    *(BYTE *)pResult = DOS_GET_DRIVE( pFCB->drive ); /* DOS_DIRENTRY_LAYOUT after current drive number */
    ((BYTE *)pResult)++;
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    pResult->fileattr = entry.dwFileAttributes;
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    pResult->cluster  = 0;  /* what else? */
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    pResult->filesize = entry.nFileSizeLow;
    memset( pResult->reserved, 0, sizeof(pResult->reserved) );
    FileTimeToDosDateTime( &entry.ftLastWriteTime,
                           &pResult->filedate, &pResult->filetime );

    /* Convert file name to FCB format */

    memset( pResult->filename, ' ', sizeof(pResult->filename) );
    if (!strcmp( entry.cAlternateFileName, "." )) pResult->filename[0] = '.';
    else if (!strcmp( entry.cAlternateFileName, ".." ))
        pResult->filename[0] = pResult->filename[1] = '.';
    else
    {
        char *p = strrchr( entry.cAlternateFileName, '.' );
        if (p && p[1] && (p != entry.cAlternateFileName))
        {
            memcpy( pResult->filename, entry.cAlternateFileName,
                    min( (p - entry.cAlternateFileName), 8 ) );
            memcpy( pResult->filename + 8, p + 1, min( strlen(p), 3 ) );
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        }
        else
            memcpy( pResult->filename, entry.cAlternateFileName,
                    min( strlen(entry.cAlternateFileName), 8 ) );
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    }
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    return 1;
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static void DeleteFileFCB( CONTEXT86 *context )
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{
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}
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static void RenameFileFCB( CONTEXT86 *context )
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{
static void fLock( CONTEXT86 * context )
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    switch ( AX_reg(context) & 0xff )
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    {
        case 0x00: /* LOCK */
	  TRACE("lock handle %d offset %ld length %ld\n",
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		BX_reg(context),
		MAKELONG(DX_reg(context),CX_reg(context)),
		MAKELONG(DI_reg(context),SI_reg(context))) ;
          if (!LockFile(DosFileHandleToWin32Handle(BX_reg(context)),
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                        MAKELONG(DX_reg(context),CX_reg(context)), 0,
                        MAKELONG(DI_reg(context),SI_reg(context)), 0)) {
	    AX_reg(context) = GetLastError();
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	    SET_CFLAG(context);
	  }
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          break;

	case 0x01: /* UNLOCK */
	  TRACE("unlock handle %d offset %ld length %ld\n",
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		BX_reg(context),
		MAKELONG(DX_reg(context),CX_reg(context)),
		MAKELONG(DI_reg(context),SI_reg(context))) ;
          if (!UnlockFile(DosFileHandleToWin32Handle(BX_reg(context)),
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                          MAKELONG(DX_reg(context),CX_reg(context)), 0,
                          MAKELONG(DI_reg(context),SI_reg(context)), 0)) {
	    AX_reg(context) = GetLastError();
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	    SET_CFLAG(context);
	  }
	  return;
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	default:
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	  AX_reg(context) = 0x0001;
	  SET_CFLAG(context);
INT21_networkfunc (CONTEXT86 *context)
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{
     switch (AL_reg(context)) {
     case 0x00: /* Get machine name. */
     {
	  char *dst = CTX_SEG_OFF_TO_LIN (context,context->SegDs,context->Edx);
	  TRACE("getting machine name to %p\n", dst);
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	  if (gethostname (dst, 15))
	  {
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	       return TRUE;
	  } else {
	       int len = strlen (dst);
	       while (len < 15)
		    dst[len++] = ' ';
	       dst[15] = 0;
	       CH_reg(context) = 1; /* Valid */
	       CL_reg(context) = 1; /* NETbios number??? */
	       TRACE("returning %s\n", debugstr_an (dst, 16));
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	       return FALSE;
	  }
     }

     default:
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	  return TRUE;
     }
}

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static void ASPI_DOS_HandleInt( CONTEXT86 *context )
    if (!Dosvm.ASPIHandler && !DPMI_LoadDosSystem())
    {
        ERR("could not setup ASPI handler\n");
        return;
    }
    Dosvm.ASPIHandler( context );
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/***********************************************************************
 *           INT21_GetExtendedError
 */
static void INT21_GetExtendedError( CONTEXT86 *context )
{
    BYTE class, action, locus;
    WORD error = GetLastError();

    switch(error)
    {
    case ERROR_SUCCESS:
        class = action = locus = 0;
        break;
    case ERROR_DIR_NOT_EMPTY:
        class  = EC_Exists;
        action = SA_Ignore;
        locus  = EL_Disk;
        break;
    case ERROR_ACCESS_DENIED:
        class  = EC_AccessDenied;
        action = SA_Abort;
        locus  = EL_Disk;
        break;
    case ERROR_CANNOT_MAKE:
        class  = EC_AccessDenied;
        action = SA_Abort;
        locus  = EL_Unknown;
        break;
    case ERROR_HANDLE_DISK_FULL:
        class  = EC_MediaError;
        action = SA_Abort;
        locus  = EL_Disk;
        break;
    case ERROR_FILE_EXISTS: