pascal OSErr ExchangeFiles(short vRefNum,
long srcDirID,
ConstStr255Param srcName,
long dstDirID,
ConstStr255Param dstName)
{
HParamBlockRec pb;
pb.fidParam.ioVRefNum = vRefNum;
pb.fidParam.ioSrcDirID = srcDirID;
pb.fidParam.ioNamePtr = (StringPtr)srcName;
pb.fidParam.ioDestDirID = dstDirID;
pb.fidParam.ioDestNamePtr = (StringPtr)dstName;
return ( PBExchangeFilesSync(&pb) );
}
pascal OSErr FSpExchangeFilesCompat(const FSSpec *source,
const FSSpec *dest)
{
#if !__MACOSSEVENFIVEORLATER
if (
#if !__MACOSSEVENORLATER
!FSHasFSSpecCalls() ||
#endif /* !__MACOSSEVENORLATER */
!HasFSpExchangeFilesCompatibilityFix() )
{
HParamBlockRec pb;
CInfoPBRec catInfoSource, catInfoDest;
OSErr result, result2;
Str31 unique1, unique2;
StringPtr unique1Ptr, unique2Ptr, swapola;
GetVolParmsInfoBuffer volInfo;
long theSeed, temp;
/* Make sure the source and destination are on the same volume */
if ( source->vRefNum != dest->vRefNum )
{
result = diffVolErr;
goto errorExit3;
}
/* Try PBExchangeFiles first since it preserves the file ID reference */
pb.fidParam.ioNamePtr = (StringPtr) &(source->name);
pb.fidParam.ioVRefNum = source->vRefNum;
pb.fidParam.ioDestNamePtr = (StringPtr) &(dest->name);
pb.fidParam.ioDestDirID = dest->parID;
pb.fidParam.ioSrcDirID = source->parID;
result = PBExchangeFilesSync(&pb);
/* Note: The compatibility case won't work for files with *Btree control blocks. */
/* Right now the only *Btree files are created by the system. */
if ( result != noErr )
{
pb.ioParam.ioNamePtr = NULL;
pb.ioParam.ioBuffer = (Ptr) &volInfo;
pb.ioParam.ioReqCount = sizeof(volInfo);
result2 = PBHGetVolParmsSync(&pb);
/* continue if volume has no fileID support (or no GetVolParms support) */
if ( (result2 == noErr) && hasFileIDs(volInfo) )
{
goto errorExit3;
}
/* Get the catalog information for each file */
/* and make sure both files are *really* files */
catInfoSource.hFileInfo.ioVRefNum = source->vRefNum;
catInfoSource.hFileInfo.ioFDirIndex = 0;
catInfoSource.hFileInfo.ioNamePtr = (StringPtr) &(source->name);
catInfoSource.hFileInfo.ioDirID = source->parID;
catInfoSource.hFileInfo.ioACUser = 0; /* ioACUser used to be filler2 */
result = PBGetCatInfoSync(&catInfoSource);
if ( result != noErr )
{
goto errorExit3;
}
if ( (catInfoSource.hFileInfo.ioFlAttrib & kioFlAttribDirMask) != 0 )
{
result = notAFileErr;
goto errorExit3;
}
catInfoDest.hFileInfo.ioVRefNum = dest->vRefNum;
catInfoDest.hFileInfo.ioFDirIndex = 0;
catInfoDest.hFileInfo.ioNamePtr = (StringPtr) &(dest->name);
catInfoDest.hFileInfo.ioDirID = dest->parID;
catInfoDest.hFileInfo.ioACUser = 0; /* ioACUser used to be filler2 */
result = PBGetCatInfoSync(&catInfoDest);
if ( result != noErr )
{
goto errorExit3;
}
if ( (catInfoDest.hFileInfo.ioFlAttrib & kioFlAttribDirMask) != 0 )
{
result = notAFileErr;
goto errorExit3;
}
/* generate 2 filenames that are unique in both directories */
theSeed = 0x64666A6C; /* a fine unlikely filename */
unique1Ptr = (StringPtr)&unique1;
unique2Ptr = (StringPtr)&unique2;
result = GenerateUniqueName(source->vRefNum, &theSeed, source->parID, dest->parID, unique1Ptr);
if ( result != noErr )
{
goto errorExit3;
}
GenerateUniqueName(source->vRefNum, &theSeed, source->parID, dest->parID, unique2Ptr);
if ( result != noErr )
{
goto errorExit3;
}
/* rename source to unique1 */
pb.fileParam.ioNamePtr = (StringPtr) &(source->name);
pb.ioParam.ioMisc = (Ptr) unique1Ptr;
pb.ioParam.ioVersNum = 0;
result = PBHRenameSync(&pb);
if ( result != noErr )
{
goto errorExit3;
}
/* rename dest to unique2 */
pb.ioParam.ioMisc = (Ptr) unique2Ptr;
pb.ioParam.ioVersNum = 0;
pb.fileParam.ioNamePtr = (StringPtr) &(dest->name);
pb.fileParam.ioDirID = dest->parID;
result = PBHRenameSync(&pb);
if ( result != noErr )
{
goto errorExit2; /* back out gracefully by renaming unique1 back to source */
}
/* If files are not in same directory, swap their locations */
if ( source->parID != dest->parID )
{
/* move source file to dest directory */
pb.copyParam.ioNamePtr = unique1Ptr;
pb.copyParam.ioNewName = NULL;
pb.copyParam.ioNewDirID = dest->parID;
pb.copyParam.ioDirID = source->parID;
result = PBCatMoveSync((CMovePBPtr) &pb);
if ( result != noErr )
{
goto errorExit1; /* back out gracefully by renaming both files to original names */
}
/* move dest file to source directory */
pb.copyParam.ioNamePtr = unique2Ptr;
pb.copyParam.ioNewDirID = source->parID;
pb.copyParam.ioDirID = dest->parID;
result = PBCatMoveSync((CMovePBPtr) &pb);
if ( result != noErr)
{
/* life is very bad. We'll at least try to move source back */
pb.copyParam.ioNamePtr = unique1Ptr;
pb.copyParam.ioNewName = NULL;
pb.copyParam.ioNewDirID = source->parID;
pb.copyParam.ioDirID = dest->parID;
(void) PBCatMoveSync((CMovePBPtr) &pb); /* ignore errors */
goto errorExit1; /* back out gracefully by renaming both files to original names */
}
}
/* Make unique1Ptr point to file in source->parID */
/* and unique2Ptr point to file in dest->parID */
/* This lets us fall through to the rename code below */
swapola = unique1Ptr;
unique1Ptr = unique2Ptr;
unique2Ptr = swapola;
/* At this point, the files are in their new locations (if they were moved) */
/* Source is named Unique1 (name pointed to by unique2Ptr) and is in dest->parID */
/* Dest is named Unique2 (name pointed to by unique1Ptr) and is in source->parID */
/* Need to swap attributes except mod date and swap names */
/* swap the catalog info by re-aiming the CInfoPB's */
catInfoSource.hFileInfo.ioNamePtr = unique1Ptr;
catInfoDest.hFileInfo.ioNamePtr = unique2Ptr;
catInfoSource.hFileInfo.ioDirID = source->parID;
catInfoDest.hFileInfo.ioDirID = dest->parID;
/* Swap the original mod dates with each file */
temp = catInfoSource.hFileInfo.ioFlMdDat;
catInfoSource.hFileInfo.ioFlMdDat = catInfoDest.hFileInfo.ioFlMdDat;
catInfoDest.hFileInfo.ioFlMdDat = temp;
/* Here's the swap (ignore errors) */
(void) PBSetCatInfoSync(&catInfoSource);
(void) PBSetCatInfoSync(&catInfoDest);
/* rename unique2 back to dest */
errorExit1:
pb.ioParam.ioMisc = (Ptr) &(dest->name);
pb.ioParam.ioVersNum = 0;
pb.fileParam.ioNamePtr = unique2Ptr;
pb.fileParam.ioDirID = dest->parID;
(void) PBHRenameSync(&pb); /* ignore errors */
/* rename unique1 back to source */
errorExit2:
pb.ioParam.ioMisc = (Ptr) &(source->name);
pb.ioParam.ioVersNum = 0;
pb.fileParam.ioNamePtr = unique1Ptr;
pb.fileParam.ioDirID = source->parID;
(void) PBHRenameSync(&pb); /* ignore errors */
}
errorExit3: {
/* null statement */
}
return ( result );
}
else
#endif /* !__MACOSSEVENFIVEORLATER */
{
return ( FSpExchangeFiles(source, dest) );
}
}