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}
if (!longpath[0]) {
SetLastError(ERROR_BAD_PATHNAME);
return 0;
if ( ( tmpshortpath = HeapAlloc ( GetProcessHeap(), 0, MAX_PATHNAME_LEN ) ) == NULL ) {
SetLastError ( ERROR_NOT_ENOUGH_MEMORY );
return 0;
if ( longpath[1] == ':' ) {
tmpshortpath[0] = longpath[0];
tmpshortpath[1] = ':';
sp = 2;
}
if ( ( drive = DOSFS_GetPathDrive ( &longpath )) == -1 ) return 0;
flags = DRIVE_GetFlags ( drive );
while ( longpath[lp] ) {
/* check for path delimiters and reproduce them */
if ( longpath[lp] == '\\' || longpath[lp] == '/' ) {
if (!sp || tmpshortpath[sp-1]!= '\\')
{
/* strip double "\\" */
tmpshortpath[sp] = '\\';
sp++;
}
tmpshortpath[sp]=0;/*terminate string*/
tmplen = strcspn ( longpath + lp, "\\/" );
lstrcpynA ( tmpshortpath+sp, longpath + lp, tmplen+1 );
/* Check, if the current element is a valid dos name */
if ( DOSFS_ValidDOSName ( longpath + lp, !(flags & DRIVE_CASE_SENSITIVE) ) ) {
sp += tmplen;
lp += tmplen;
continue;
/* Check if the file exists and use the existing file name */
if ( DOSFS_GetFullName ( tmpshortpath, TRUE, &full_name ) ) {
strcpy( tmpshortpath+sp, strrchr ( full_name.short_name, '\\' ) + 1 );
sp += strlen ( tmpshortpath+sp );
lp += tmplen;
continue;
}
TRACE("not found!\n" );
SetLastError ( ERROR_FILE_NOT_FOUND );
return 0;
tmpshortpath[sp] = 0;
lstrcpynA ( shortpath, tmpshortpath, shortlen );
TRACE("returning %s\n", debugstr_a(shortpath) );
tmplen = strlen ( tmpshortpath );
HeapFree ( GetProcessHeap(), 0, tmpshortpath );
}
/***********************************************************************
* GetShortPathNameW (KERNEL32.272)
DWORD WINAPI GetShortPathNameW( LPCWSTR longpath, LPWSTR shortpath,
LPSTR longpathA, shortpathA;
longpathA = HEAP_strdupWtoA( GetProcessHeap(), 0, longpath );
shortpathA = HeapAlloc ( GetProcessHeap(), 0, shortlen );
ret = GetShortPathNameA ( longpathA, shortpathA, shortlen );
lstrcpynAtoW ( shortpath, shortpathA, shortlen );
HeapFree( GetProcessHeap(), 0, shortpathA );
return ret;
/***********************************************************************
* GetLongPathNameA (KERNEL32.xxx)
DWORD WINAPI GetLongPathNameA( LPCSTR shortpath, LPSTR longpath,
DWORD longlen )
{
DOS_FULL_NAME full_name;
if (!DOSFS_GetFullName( shortpath, TRUE, &full_name )) return 0;
lstrcpynA( longpath, full_name.short_name, longlen );
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/* Do some hackery to get the long filename. */
if (longpath) {
ss=longpath+strlen(longpath);
ll=full_name.long_name+strlen(full_name.long_name);
p=NULL;
while (ss>=longpath)
{
/* FIXME: aren't we more paranoid, than needed? */
while ((ss[0]=='\\') && (ss>=longpath)) ss--;
p=ss;
while ((ss[0]!='\\') && (ss>=longpath)) ss--;
if (ss>=longpath)
{
/* FIXME: aren't we more paranoid, than needed? */
while ((ll[0]=='/') && (ll>=full_name.long_name)) ll--;
while ((ll[0]!='/') && (ll>=full_name.long_name)) ll--;
if (ll<full_name.long_name)
{
ERR("Bad longname! (ss=%s ll=%s)\n This should never happen !\n"
,ss ,ll );
return 0;
}
}
}
/* FIXME: fix for names like "C:\\" (ie. with more '\'s) */
if (p && p[2])
{
p+=1;
if ((p-longpath)>0) longlen -= (p-longpath);
lstrcpynA( p, ll , longlen);
/* Now, change all '/' to '\' */
for (r=p; r<(p+longlen); r++ )
if (r[0]=='/') r[0]='\\';
return strlen(longpath) - strlen(p) + longlen;
}
}
}
/***********************************************************************
* GetLongPathNameW (KERNEL32.269)
DWORD WINAPI GetLongPathNameW( LPCWSTR shortpath, LPWSTR longpath,
DWORD longlen )
{
DOS_FULL_NAME full_name;
DWORD ret = 0;
LPSTR shortpathA = HEAP_strdupWtoA( GetProcessHeap(), 0, shortpath );
/* FIXME: is it correct to always return a fully qualified short path? */
if (DOSFS_GetFullName( shortpathA, TRUE, &full_name ))
{
ret = strlen( full_name.short_name );
lstrcpynAtoW( longpath, full_name.long_name, longlen );
}
HeapFree( GetProcessHeap(), 0, shortpathA );
return ret;
}
/***********************************************************************
* DOSFS_DoGetFullPathName
* Implementation of GetFullPathNameA/W.
* bon@elektron 000331:
* A test for GetFullPathName with many patholotical case
* gives now identical output for Wine and OSR2
static DWORD DOSFS_DoGetFullPathName( LPCSTR name, DWORD len, LPSTR result,
BOOL unicode )
DOS_FULL_NAME full_name;
char *p,*q;
const char * root;
char drivecur[]="c:.";
char driveletter=0;
int namelen,drive=0;
if ((strlen(name) >1)&& (name[1]==':'))
/*drive letter given */
{
driveletter = name[0];
}
if ((strlen(name) >2)&& (name[1]==':') &&
((name[2]=='\\') || (name[2]=='/')))
/*absolute path given */
lstrcpynA(full_name.short_name,name,MAX_PATHNAME_LEN);
drive = (int)toupper(name[0]) - 'A';
}
else
{
if (driveletter)
drivecur[0]=driveletter;
else
strcpy(drivecur,".");
if (!DOSFS_GetFullName( drivecur, FALSE, &full_name ))
{
FIXME("internal: error getting drive/path\n");
return 0;
}
/* find path that drive letter substitutes*/
drive = (int)toupper(full_name.short_name[0]) -0x41;
root= DRIVE_GetRoot(drive);
if (!root)
{
FIXME("internal: error getting DOS Drive Root\n");
return 0;
}
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p= full_name.long_name +strlen(root);
/* append long name (= unix name) to drive */
lstrcpynA(full_name.short_name+2,p,MAX_PATHNAME_LEN-3);
/* append name to treat */
namelen= strlen(full_name.short_name);
p = (char*)name;
if (driveletter)
p += +2; /* skip drive name when appending */
if (namelen +2 + strlen(p) > MAX_PATHNAME_LEN)
{
FIXME("internal error: buffer too small\n");
return 0;
}
full_name.short_name[namelen++] ='\\';
full_name.short_name[namelen] = 0;
lstrcpynA(full_name.short_name +namelen,p,MAX_PATHNAME_LEN-namelen);
}
/* reverse all slashes */
for (p=full_name.short_name;
p < full_name.short_name+strlen(full_name.short_name);
p++)
{
if ( *p == '/' )
*p = '\\';
}
/* Use memmove, as areas overlap*/
/* Delete .. */
while ((p = strstr(full_name.short_name,"\\..\\")))
{
if (p > full_name.short_name+2)
{
*p = 0;
q = strrchr(full_name.short_name,'\\');
memmove(q+1,p+4,strlen(p+4)+1);
}
else
{
memmove(full_name.short_name+3,p+4,strlen(p+4)+1);
}
}
if ((full_name.short_name[2]=='.')&&(full_name.short_name[3]=='.'))
{
/* This case istn't treated yet : c:..\test */
memmove(full_name.short_name+2,full_name.short_name+4,
strlen(full_name.short_name+4)+1);
}
/* Delete . */
while ((p = strstr(full_name.short_name,"\\.\\")))
{
*(p+1) = 0;
memmove(p+1,p+3,strlen(p+3)+1);
if (!(DRIVE_GetFlags(drive) & DRIVE_CASE_PRESERVING))
_strupr( full_name.short_name );
namelen=strlen(full_name.short_name);
if (!strcmp(full_name.short_name+namelen-3,"\\.."))
{
/* one more starnge case: "c:\test\test1\.."
return "c:\test"*/
*(full_name.short_name+namelen-3)=0;
q = strrchr(full_name.short_name,'\\');
*q =0;
}
if (full_name.short_name[namelen-1]=='.')
full_name.short_name[(namelen--)-1] =0;
if (!driveletter)
if (full_name.short_name[namelen-1]=='\\')
full_name.short_name[(namelen--)-1] =0;
TRACE("got %s\n",full_name.short_name);
/* If the lpBuffer buffer is too small, the return value is the
size of the buffer, in characters, required to hold the path
plus the terminating \0 (tested against win95osr, bon 001118)
. */
ret = strlen(full_name.short_name);
if (ret >= len )
{
/* don't touch anything when the buffer is not large enough */
SetLastError( ERROR_INSUFFICIENT_BUFFER );
return ret+1;
}

Alexandre Julliard
committed
if (result)
{
if (unicode)
lstrcpynAtoW( (LPWSTR)result, full_name.short_name, len );

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else
lstrcpynA( result, full_name.short_name, len );

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}
TRACE("returning '%s'\n", full_name.short_name );
return ret;
}
/***********************************************************************
* GetFullPathNameA (KERNEL32.272)
* NOTES
* if the path closed with '\', *lastpart is 0
DWORD WINAPI GetFullPathNameA( LPCSTR name, DWORD len, LPSTR buffer,
{
DWORD ret = DOSFS_DoGetFullPathName( name, len, buffer, FALSE );
if (*p != '\\')
{
while ((p > buffer + 2) && (*p != '\\')) p--;
*lastpart = p + 1;
}
else *lastpart = NULL;
}
return ret;
}
/***********************************************************************
* GetFullPathNameW (KERNEL32.273)
DWORD WINAPI GetFullPathNameW( LPCWSTR name, DWORD len, LPWSTR buffer,
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
DWORD ret = DOSFS_DoGetFullPathName( nameA, len, (LPSTR)buffer, TRUE );
HeapFree( GetProcessHeap(), 0, nameA );
LPWSTR p = buffer + strlenW(buffer);
if (*p != (WCHAR)'\\')
{
while ((p > buffer + 2) && (*p != (WCHAR)'\\')) p--;
*lastpart = p + 1;
}
else *lastpart = NULL;
}
/***********************************************************************
static int DOSFS_FindNextEx( FIND_FIRST_INFO *info, WIN32_FIND_DATAA *entry )
DWORD attr = info->attr | FA_UNUSED | FA_ARCHIVE | FA_RDONLY | FILE_ATTRIBUTE_SYMLINK;
UINT flags = DRIVE_GetFlags( info->drive );
char *p, buffer[MAX_PATHNAME_LEN];
const char *drive_path;
int drive_root;
BY_HANDLE_FILE_INFORMATION fileinfo;
char dos_name[13];
if ((info->attr & ~(FA_UNUSED | FA_ARCHIVE | FA_RDONLY)) == FA_LABEL)
RtlSecondsSince1970ToTime( (time_t)0, &entry->ftCreationTime );
RtlSecondsSince1970ToTime( (time_t)0, &entry->ftLastAccessTime );
RtlSecondsSince1970ToTime( (time_t)0, &entry->ftLastWriteTime );
entry->nFileSizeHigh = 0;
entry->nFileSizeLow = 0;
entry->dwReserved0 = 0;
entry->dwReserved1 = 0;
DOSFS_ToDosDTAFormat( DRIVE_GetLabel( info->drive ), entry->cFileName );
strcpy( entry->cAlternateFileName, entry->cFileName );
info->cur_pos++;
TRACE("returning %s (%s) as label\n",
entry->cFileName, entry->cAlternateFileName);
drive_path = info->path + strlen(DRIVE_GetRoot( info->drive ));
while ((*drive_path == '/') || (*drive_path == '\\')) drive_path++;
drive_root = !*drive_path;
lstrcpynA( buffer, info->path, sizeof(buffer) - 1 );
strcat( buffer, "/" );
p = buffer + strlen(buffer);
while (DOSFS_ReadDir( info->dir, &long_name, &short_name ))
/* Don't return '.' and '..' in the root of the drive */
if (drive_root && (long_name[0] == '.') &&
(!long_name[1] || ((long_name[1] == '.') && !long_name[2])))
continue;
flags & DRIVE_CASE_SENSITIVE )) continue;
}
/* Check the short mask */
{
DOSFS_Hash( long_name, dos_name, TRUE,
!(flags & DRIVE_CASE_SENSITIVE) );
short_name = dos_name;
}
if (!DOSFS_MatchShort( info->short_mask, short_name )) continue;
lstrcpynA( p, long_name, sizeof(buffer) - (int)(p - buffer) );
WARN("can't stat %s\n", buffer);
if ((fileinfo.dwFileAttributes & FILE_ATTRIBUTE_SYMLINK) &&
(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
{
static int show_dir_symlinks = -1;
if (show_dir_symlinks == -1)
show_dir_symlinks = PROFILE_GetWineIniBool("wine", "ShowDirSymlinks", 0);
if (!show_dir_symlinks) continue;
}
/* We now have a matching entry; fill the result and return */
entry->dwFileAttributes = fileinfo.dwFileAttributes;
entry->ftCreationTime = fileinfo.ftCreationTime;
entry->ftLastAccessTime = fileinfo.ftLastAccessTime;
entry->ftLastWriteTime = fileinfo.ftLastWriteTime;
entry->nFileSizeHigh = fileinfo.nFileSizeHigh;
entry->nFileSizeLow = fileinfo.nFileSizeLow;
if (short_name)
DOSFS_ToDosDTAFormat( short_name, entry->cAlternateFileName );
else
DOSFS_Hash( long_name, entry->cAlternateFileName, FALSE,
!(flags & DRIVE_CASE_SENSITIVE) );
lstrcpynA( entry->cFileName, long_name, sizeof(entry->cFileName) );
if (!(flags & DRIVE_CASE_PRESERVING)) _strlwr( entry->cFileName );
TRACE("returning %s (%s) %02lx %ld\n",
entry->cFileName, entry->cAlternateFileName,
entry->dwFileAttributes, entry->nFileSizeLow );
/***********************************************************************
* DOSFS_FindNext
*
* Find the next matching file. Return the number of entries read to find
* the matching one, or 0 if no more entries.
* 'short_mask' is the 8.3 mask (in FCB format), 'long_mask' is the long
* file name mask. Either or both can be NULL.
*
* NOTE: This is supposed to be only called by the int21 emulation
* routines. Thus, we should own the Win16Mutex anyway.
* Nevertheless, we explicitly enter it to ensure the static
* directory cache is protected.
*/
int DOSFS_FindNext( const char *path, const char *short_mask,
const char *long_mask, int drive, BYTE attr,
int skip, WIN32_FIND_DATAA *entry )
static FIND_FIRST_INFO info;
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LPCSTR short_name, long_name;
int count;
SYSLEVEL_EnterWin16Lock();
/* Check the cached directory */
if (!(info.dir && info.path == path && info.short_mask == short_mask
&& info.long_mask == long_mask && info.drive == drive
&& info.attr == attr && info.cur_pos <= skip))
{
/* Not in the cache, open it anew */
if (info.dir) DOSFS_CloseDir( info.dir );
info.path = (LPSTR)path;
info.long_mask = (LPSTR)long_mask;
info.short_mask = (LPSTR)short_mask;
info.attr = attr;
info.drive = drive;
info.cur_pos = 0;
info.dir = DOSFS_OpenDir( info.path );
}
/* Skip to desired position */
while (info.cur_pos < skip)
if (info.dir && DOSFS_ReadDir( info.dir, &long_name, &short_name ))
if (info.dir && info.cur_pos == skip && DOSFS_FindNextEx( &info, entry ))
count = info.cur_pos - skip;
else
count = 0;
if (!count)
{
memset( &info, '\0', sizeof(info) );
}
SYSLEVEL_LeaveWin16Lock();
return count;
}
/*************************************************************************
* FindFirstFileExA (KERNEL32)
HANDLE WINAPI FindFirstFileExA(
LPCSTR lpFileName,
FINDEX_INFO_LEVELS fInfoLevelId,
LPVOID lpFindFileData,
FINDEX_SEARCH_OPS fSearchOp,
LPVOID lpSearchFilter,
DWORD dwAdditionalFlags)
HGLOBAL handle;
if ((fSearchOp != FindExSearchNameMatch) || (dwAdditionalFlags != 0))
{
FIXME("options not implemented 0x%08x 0x%08lx\n", fSearchOp, dwAdditionalFlags );
return INVALID_HANDLE_VALUE;
}
switch(fInfoLevelId)
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case FindExInfoStandard:
{
WIN32_FIND_DATAA * data = (WIN32_FIND_DATAA *) lpFindFileData;
data->dwReserved0 = data->dwReserved1 = 0x0;
if (!lpFileName) return 0;
if (!DOSFS_GetFullName( lpFileName, FALSE, &full_name )) break;
if (!(handle = GlobalAlloc(GMEM_MOVEABLE, sizeof(FIND_FIRST_INFO)))) break;
info = (FIND_FIRST_INFO *)GlobalLock( handle );
info->path = HEAP_strdupA( GetProcessHeap(), 0, full_name.long_name );
info->long_mask = strrchr( info->path, '/' );
*(info->long_mask++) = '\0';
info->short_mask = NULL;
info->attr = 0xff;
if (lpFileName[0] && (lpFileName[1] == ':'))
info->drive = toupper(*lpFileName) - 'A';
else info->drive = DRIVE_GetCurrentDrive();
info->cur_pos = 0;
info->dir = DOSFS_OpenDir( info->path );
GlobalUnlock( handle );
if (!FindNextFileA( handle, data ))
{
FindClose( handle );
SetLastError( ERROR_NO_MORE_FILES );
break;
}
return handle;
}
break;
default:
FIXME("fInfoLevelId 0x%08x not implemented\n", fInfoLevelId );
return INVALID_HANDLE_VALUE;
}
/*************************************************************************
* FindFirstFileA (KERNEL32.123)
HANDLE WINAPI FindFirstFileA(
LPCSTR lpFileName,
WIN32_FIND_DATAA *lpFindData )
return FindFirstFileExA(lpFileName, FindExInfoStandard, lpFindData,
FindExSearchNameMatch, NULL, 0);
}
/*************************************************************************
* FindFirstFileExW (KERNEL32)
HANDLE WINAPI FindFirstFileExW(
LPCWSTR lpFileName,
FINDEX_INFO_LEVELS fInfoLevelId,
LPVOID lpFindFileData,
FINDEX_SEARCH_OPS fSearchOp,
LPVOID lpSearchFilter,
DWORD dwAdditionalFlags)
HANDLE handle;
WIN32_FIND_DATAA dataA;
LPVOID _lpFindFileData;
LPSTR pathA;
switch(fInfoLevelId)
{
case FindExInfoStandard:
{
_lpFindFileData = &dataA;
}
break;
default:
FIXME("fInfoLevelId 0x%08x not implemented\n", fInfoLevelId );
return INVALID_HANDLE_VALUE;
}
pathA = HEAP_strdupWtoA( GetProcessHeap(), 0, lpFileName );
handle = FindFirstFileExA(pathA, fInfoLevelId, _lpFindFileData, fSearchOp, lpSearchFilter, dwAdditionalFlags);
if (handle == INVALID_HANDLE_VALUE) return handle;
switch(fInfoLevelId)
case FindExInfoStandard:
{
WIN32_FIND_DATAW *dataW = (WIN32_FIND_DATAW*) lpFindFileData;
dataW->dwFileAttributes = dataA.dwFileAttributes;
dataW->ftCreationTime = dataA.ftCreationTime;
dataW->ftLastAccessTime = dataA.ftLastAccessTime;
dataW->ftLastWriteTime = dataA.ftLastWriteTime;
dataW->nFileSizeHigh = dataA.nFileSizeHigh;
dataW->nFileSizeLow = dataA.nFileSizeLow;
MultiByteToWideChar( CP_ACP, 0, dataA.cFileName, -1,
dataW->cFileName, sizeof(dataW->cFileName)/sizeof(WCHAR) );
MultiByteToWideChar( CP_ACP, 0, dataA.cAlternateFileName, -1,
dataW->cAlternateFileName,
sizeof(dataW->cAlternateFileName)/sizeof(WCHAR) );
}
break;
default:
FIXME("fInfoLevelId 0x%08x not implemented\n", fInfoLevelId );
return INVALID_HANDLE_VALUE;
/*************************************************************************
* FindFirstFileW (KERNEL32.124)
*/
HANDLE WINAPI FindFirstFileW( LPCWSTR lpFileName, WIN32_FIND_DATAW *lpFindData )
{
return FindFirstFileExW(lpFileName, FindExInfoStandard, lpFindData,
FindExSearchNameMatch, NULL, 0);
}
/*************************************************************************
* FindNextFileA (KERNEL32.126)
BOOL WINAPI FindNextFileA( HANDLE handle, WIN32_FIND_DATAA *data )
if ((handle == INVALID_HANDLE_VALUE) ||
!(info = (FIND_FIRST_INFO *)GlobalLock( handle )))
SetLastError( ERROR_INVALID_HANDLE );
GlobalUnlock( handle );
SetLastError( ERROR_NO_MORE_FILES );
HeapFree( GetProcessHeap(), 0, info->path );
SetLastError( ERROR_NO_MORE_FILES );
return FALSE;
}
return TRUE;
}
/*************************************************************************
* FindNextFileW (KERNEL32.127)
BOOL WINAPI FindNextFileW( HANDLE handle, WIN32_FIND_DATAW *data )
WIN32_FIND_DATAA dataA;
if (!FindNextFileA( handle, &dataA )) return FALSE;
data->dwFileAttributes = dataA.dwFileAttributes;
data->ftCreationTime = dataA.ftCreationTime;
data->ftLastAccessTime = dataA.ftLastAccessTime;
data->ftLastWriteTime = dataA.ftLastWriteTime;
data->nFileSizeHigh = dataA.nFileSizeHigh;
data->nFileSizeLow = dataA.nFileSizeLow;
MultiByteToWideChar( CP_ACP, 0, dataA.cFileName, -1,
data->cFileName, sizeof(data->cFileName)/sizeof(WCHAR) );
MultiByteToWideChar( CP_ACP, 0, dataA.cAlternateFileName, -1,
data->cAlternateFileName,
sizeof(data->cAlternateFileName)/sizeof(WCHAR) );
return TRUE;
}
/*************************************************************************
* FindClose (KERNEL32.119)
BOOL WINAPI FindClose( HANDLE handle )
if ((handle == INVALID_HANDLE_VALUE) ||
!(info = (FIND_FIRST_INFO *)GlobalLock( handle )))
SetLastError( ERROR_INVALID_HANDLE );
if (info->path) HeapFree( GetProcessHeap(), 0, info->path );
GlobalUnlock( handle );
GlobalFree( handle );
/***********************************************************************
* DOSFS_UnixTimeToFileTime
*
* Convert a Unix time to FILETIME format.
* The FILETIME structure is a 64-bit value representing the number of
* 100-nanosecond intervals since January 1, 1601, 0:00.
* 'remainder' is the nonnegative number of 100-ns intervals
* corresponding to the time fraction smaller than 1 second that
* couldn't be stored in the time_t value.
void DOSFS_UnixTimeToFileTime( time_t unix_time, FILETIME *filetime,
DWORD remainder )
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/* NOTES:
CONSTANTS:
The time difference between 1 January 1601, 00:00:00 and
1 January 1970, 00:00:00 is 369 years, plus the leap years
from 1604 to 1968, excluding 1700, 1800, 1900.
This makes (1968 - 1600) / 4 - 3 = 89 leap days, and a total
of 134774 days.
Any day in that period had 24 * 60 * 60 = 86400 seconds.
The time difference is 134774 * 86400 * 10000000, which can be written
116444736000000000
27111902 * 2^32 + 3577643008
413 * 2^48 + 45534 * 2^32 + 54590 * 2^16 + 32768
If you find that these constants are buggy, please change them in all
instances in both conversion functions.
VERSIONS:
There are two versions, one of them uses long long variables and
is presumably faster but not ISO C. The other one uses standard C
data types and operations but relies on the assumption that negative
numbers are stored as 2's complement (-1 is 0xffff....). If this
assumption is violated, dates before 1970 will not convert correctly.
This should however work on any reasonable architecture where WINE
will run.
DETAILS:
Take care not to remove the casts. I have tested these functions
(in both versions) for a lot of numbers. I would be interested in
results on other compilers than GCC.
The operations have been designed to account for the possibility
of 64-bit time_t in future UNICES. Even the versions without
internal long long numbers will work if time_t only is 64 bit.
A 32-bit shift, which was necessary for that operation, turned out
not to work correctly in GCC, besides giving the warning. So I
used a double 16-bit shift instead. Numbers are in the ISO version
represented by three limbs, the most significant with 32 bit, the
other two with 16 bit each.
As the modulo-operator % is not well-defined for negative numbers,
negative divisors have been avoided in DOSFS_FileTimeToUnixTime.
There might be quicker ways to do this in C. Certainly so in
assembler.
Claus Fischer, fischer@iue.tuwien.ac.at
*/
#if SIZEOF_LONG_LONG >= 8
# define USE_LONG_LONG 1
#else
# define USE_LONG_LONG 0
#endif
#if USE_LONG_LONG /* gcc supports long long type */
long long int t = unix_time;
t *= 10000000;
t += 116444736000000000LL;
t += remainder;
filetime->dwLowDateTime = (UINT)t;
filetime->dwHighDateTime = (UINT)(t >> 32);
UINT a0; /* 16 bit, low bits */
UINT a1; /* 16 bit, medium bits */
UINT a2; /* 32 bit, high bits */
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/* Copy the unix time to a2/a1/a0 */
a0 = unix_time & 0xffff;
a1 = (unix_time >> 16) & 0xffff;
/* This is obsolete if unix_time is only 32 bits, but it does not hurt.
Do not replace this by >> 32, it gives a compiler warning and it does
not work. */
a2 = (unix_time >= 0 ? (unix_time >> 16) >> 16 :
~((~unix_time >> 16) >> 16));
/* Multiply a by 10000000 (a = a2/a1/a0)
Split the factor into 10000 * 1000 which are both less than 0xffff. */
a0 *= 10000;
a1 = a1 * 10000 + (a0 >> 16);
a2 = a2 * 10000 + (a1 >> 16);
a0 &= 0xffff;
a1 &= 0xffff;
a0 *= 1000;
a1 = a1 * 1000 + (a0 >> 16);
a2 = a2 * 1000 + (a1 >> 16);
a0 &= 0xffff;
a1 &= 0xffff;
/* Add the time difference and the remainder */
a0 += 32768 + (remainder & 0xffff);
a1 += 54590 + (remainder >> 16 ) + (a0 >> 16);
a2 += 27111902 + (a1 >> 16);
a0 &= 0xffff;
a1 &= 0xffff;
/* Set filetime */
filetime->dwLowDateTime = (a1 << 16) + a0;
filetime->dwHighDateTime = a2;
#endif
/***********************************************************************
* DOSFS_FileTimeToUnixTime
*
* Convert a FILETIME format to Unix time.
* If not NULL, 'remainder' contains the fractional part of the filetime,
* in the range of [0..9999999] (even if time_t is negative).
time_t DOSFS_FileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder )
/* Read the comment in the function DOSFS_UnixTimeToFileTime. */
#if USE_LONG_LONG
long long int t = filetime->dwHighDateTime;
t <<= 32;
t += (UINT)filetime->dwLowDateTime;
t -= 116444736000000000LL;
if (t < 0)
{
if (remainder) *remainder = 9999999 - (-t - 1) % 10000000;
return -1 - ((-t - 1) / 10000000);
}
else
{
if (remainder) *remainder = t % 10000000;
return t / 10000000;
}
#else /* ISO version */
UINT a0; /* 16 bit, low bits */
UINT a1; /* 16 bit, medium bits */
UINT a2; /* 32 bit, high bits */
UINT r; /* remainder of division */
unsigned int carry; /* carry bit for subtraction */
int negative; /* whether a represents a negative value */
/* Copy the time values to a2/a1/a0 */
a2 = (UINT)filetime->dwHighDateTime;
a1 = ((UINT)filetime->dwLowDateTime ) >> 16;
a0 = ((UINT)filetime->dwLowDateTime ) & 0xffff;
/* Subtract the time difference */
if (a0 >= 32768 ) a0 -= 32768 , carry = 0;
else a0 += (1 << 16) - 32768 , carry = 1;
if (a1 >= 54590 + carry) a1 -= 54590 + carry, carry = 0;
else a1 += (1 << 16) - 54590 - carry, carry = 1;
a2 -= 27111902 + carry;
/* If a is negative, replace a by (-1-a) */
negative = (a2 >= ((UINT)1) << 31);
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if (negative)
{
/* Set a to -a - 1 (a is a2/a1/a0) */
a0 = 0xffff - a0;
a1 = 0xffff - a1;
a2 = ~a2;
}
/* Divide a by 10000000 (a = a2/a1/a0), put the rest into r.
Split the divisor into 10000 * 1000 which are both less than 0xffff. */
a1 += (a2 % 10000) << 16;
a2 /= 10000;
a0 += (a1 % 10000) << 16;
a1 /= 10000;
r = a0 % 10000;
a0 /= 10000;
a1 += (a2 % 1000) << 16;
a2 /= 1000;
a0 += (a1 % 1000) << 16;
a1 /= 1000;
r += (a0 % 1000) * 10000;
a0 /= 1000;
/* If a was negative, replace a by (-1-a) and r by (9999999 - r) */
if (negative)
{
/* Set a to -a - 1 (a is a2/a1/a0) */
a0 = 0xffff - a0;
a1 = 0xffff - a1;
a2 = ~a2;
r = 9999999 - r;
}
if (remainder) *remainder = r;
/* Do not replace this by << 32, it gives a compiler warning and it does
not work. */
return ((((time_t)a2) << 16) << 16) + (a1 << 16) + a0;
#endif
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/***********************************************************************
* MulDiv (KERNEL32.391)
* RETURNS
* Result of multiplication and division
* -1: Overflow occurred or Divisor was 0
*/
INT WINAPI MulDiv(
INT nMultiplicand,
INT nMultiplier,
INT nDivisor)
{
#if SIZEOF_LONG_LONG >= 8
long long ret;
if (!nDivisor) return -1;
/* We want to deal with a positive divisor to simplify the logic. */
if (nDivisor < 0)
{
nMultiplicand = - nMultiplicand;
nDivisor = -nDivisor;
}
/* If the result is positive, we "add" to round. else, we subtract to round. */
if ( ( (nMultiplicand < 0) && (nMultiplier < 0) ) ||
( (nMultiplicand >= 0) && (nMultiplier >= 0) ) )
ret = (((long long)nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
else
ret = (((long long)nMultiplicand * nMultiplier) - (nDivisor/2)) / nDivisor;
if ((ret > 2147483647) || (ret < -2147483647)) return -1;
return ret;
#else
if (!nDivisor) return -1;