/* ein Byte in das ???-Register des ST7036 senden */
void ST7036_write_byte( char data )
{
signed char u8_zahl = 8;
char c_data;
// Chip-Select auf log.0
Clear_Bit( ST7036_CSB );
c_data = data;
do
{
_delay_loop_2(6);
if ( c_data & 0x80 ) // oberstes Bit von c_data betrachten
Set_Bit(ST7036_SI); // und Datenleitung entsprechend setzen
else
Clear_Bit(ST7036_SI);
_delay_loop_2(5); // einen Clockpuls erzeugen
Clear_Bit(ST7036_CLK);
_delay_loop_2(6);
Set_Bit(ST7036_CLK);
c_data = c_data << 1;
u8_zahl --;
} while (u8_zahl > 0);
// Chip-Select wieder auf log.1
warte_ms( 2 );
Set_Bit( ST7036_CSB );
}
/* Reset durchführen */
void ST7036_reset(void)
{
#ifdef ST7036_RESET
Clear_Bit(lcdReset); // Hardware-Reset log.0 an den ST7036 anlegen
warte_ms( 100 );
Set_Bit(lcdReset);
#endif
}
/*
* Clears all of the bits in the superblock used for the file
*/
void Clear_File_Bits(void *bitmap, struct Block_Device *dev, GOSFSptr *entry) {
int index = 0;
int newIndex = 0;
GOSFSfileNode *node = &entry->node;
int *array = Safe_Calloc(PAGE_SIZE);
int *array2 = Safe_Calloc(PAGE_SIZE);
for (index = 0; index < (node->size/PAGE_SIZE); index++) {
memset(array, '\0', PAGE_SIZE);
memset(array2, '\0', PAGE_SIZE);
if (index < SINGLE_BLOCK) {
Clear_Bit(bitmap, node->blocks[index]);
} else if (index > SINGLE_MIN_INDEX && index < SINGLE_MAX_INDEX) {
GOSFS_Block_Read(dev, node->blocks[SINGLE_BLOCK], array);
Clear_Bit(bitmap, array[index - SINGLE_BLOCK]);
Clear_Bit(bitmap, node->blocks[SINGLE_BLOCK]);
} else {
GOSFS_Block_Read(dev, node->blocks[DBL_BLOCK], array);
newIndex = index - SINGLE_MAX_INDEX;
GOSFS_Block_Read(dev, array[newIndex/INT_ARR_SIZE], array2);
Clear_Bit(bitmap, array2[newIndex % INT_ARR_SIZE]);
Clear_Bit(bitmap, array[newIndex/INT_ARR_SIZE]);
Clear_Bit(bitmap, node->blocks[DBL_BLOCK]);
}
}
Free(array);
Free(array2);
}
int main() {
void *bitset = Create_Bit_Set(100);
assert(Find_First_Free_Bit(bitset,100) == 0);
Set_Bit(bitset, 0);
assert(Find_First_Free_Bit(bitset,100) == 1);
Set_Bit(bitset, 1);
assert(Find_First_Free_Bit(bitset,100) == 2);
Set_Bit(bitset, 3);
assert(Find_First_Free_Bit(bitset,100) == 2);
Set_Bit(bitset, 4);
Set_Bit(bitset, 5);
Set_Bit(bitset, 6);
Set_Bit(bitset, 7);
assert(Find_First_Free_Bit(bitset,100) == 2);
Set_Bit(bitset, 2);
assert(Find_First_Free_Bit(bitset,100) == 8);
Clear_Bit(bitset, 2);
assert(Find_First_Free_Bit(bitset,100) == 2);
}
int Destroy_Semaphore(int sid)
{
if (!validateSID(sid)) {
return EINVALID;
}
bool atomic = Begin_Int_Atomic();
KASSERT(0 < g_Semaphores[sid].references);
g_Semaphores[sid].references--;
Clear_Bit(g_currentThread->semaphores, sid);
if (g_Semaphores[sid].references == 0) {
g_Semaphores[sid].available = true; /* mark it available */
Wake_Up(&g_Semaphores[sid].waitingThreads); /* wake all threads */
}
End_Int_Atomic(atomic);
return 0;
}
/* ein Byte in das Control-Register des KS0073 senden */
void ST7036_write_command_byte( char data )
{
Clear_Bit( ST7036_RS );
_delay_loop_2( 1 );
ST7036_write_byte( data );
}
/*
* Delete the given file.
* Return > 0 on success, < 0 on failure.
*/
int GOSFS_Delete(struct Mount_Point *mountPoint, const char *path) {
int rc = 0;
int blockNum = 0; // The GOSFS block the fileNode(file or dir) exists in
int index = 0;
char name[MAX_NAME_SIZE] = {};
struct File *dir = 0;
bool found = 0;
GOSFSsuperblock *super = (GOSFSsuperblock *)mountPoint->fsData;
GOSFSptr *gosfsEntry = Safe_Calloc(sizeof(GOSFSptr));
GOSFSdirectory *currDir = Safe_Calloc(PAGE_SIZE);
GOSFSdirectory *tempDir = Safe_Calloc(PAGE_SIZE);
GOSFSfileNode *currNode = 0;
/* Grab root dir from disk */
blockNum = super->rootDir;
GOSFS_Block_Read(mountPoint->dev, blockNum, currDir);
/* Find file node */
while (*path != 0) {
memset(name, '\0', MAX_NAME_SIZE);
memset(gosfsEntry, '\0', sizeof(GOSFSptr));
Get_Next_Name_In_Path(&path, name);
found = GOSFS_Lookup(currDir, name, blockNum, gosfsEntry);
/* Entry exists but not a file and not end of path */
if (found == true && gosfsEntry->node.isDirectory == 0 && *path != 0) {
rc = ENOTDIR;
goto fail;
}
/* Entry exists but directory ,search in that dir */
if (found == true && gosfsEntry->node.isDirectory == 1 && *path != 0) {
blockNum = gosfsEntry->node.blocks[0];
GOSFS_Block_Read(mountPoint->dev, blockNum, currDir);
continue;
}
if (found == false) {
rc = ENOTFOUND;
goto fail;
}
}
/* If directory */
if (gosfsEntry->node.isDirectory == 1) {
/* Check if directory is empty and fail if it isn't */
GOSFS_Block_Read(mountPoint->dev, gosfsEntry->node.blocks[0], tempDir);
for (index = 0; index < MAX_FILES_PER_DIR; index++) {
currNode = &tempDir->files[index];
if (currNode->isUsed != 0) {
rc = EBUSY;
goto fail;
}
}
Clear_Bit(&super->bitmap, gosfsEntry->node.blocks[0]);
memset(&currDir->files[gosfsEntry->offset], '\0', sizeof(GOSFSfileNode));
}
/* Else file */
else {
Clear_File_Bits(&super->bitmap, mountPoint->dev, gosfsEntry);
memset(&currDir->files[gosfsEntry->offset], '\0', sizeof(GOSFSfileNode));
}
/* Copy changes back to disk */
GOSFS_Block_Write(mountPoint->dev, blockNum, currDir);
GOSFS_Block_Write(mountPoint->dev, 0, super);
fail:
done:
Free(tempDir);
Free(gosfsEntry);
Free(currDir);
return rc;
}
/*
* Delete the given file.
* Return > 0 on success, < 0 on failure.
*/
int GOSFS_Delete(struct Mount_Point *mountPoint, const char *path) {
GOSFSinstance *instance = (GOSFSinstance *) mountPoint->fsData;
GOSFSsuperblock *superblock = instance->superblock;
struct File *file = 0;
GOSFSdirectory *dir = 0;
GOSFSptr *filePtr;
ulong_t vblock, endBlock;
int physBlock, rc, i;
/* Psuedo-open the file */
rc = GOSFS_Open(mountPoint, path, 0, &file);
if (rc < 0)
goto fail;
dir = Malloc(sizeof(GOSFSdirectory));
if (!dir)
goto memfail;
filePtr = (GOSFSptr *) file->fsData;
/* Is this a directory? */
if (filePtr->node.isDirectory) {
/* Read in directory contents */
rc = readGOSFSBlock(instance->dev, filePtr->node.blocks[0], dir,
sizeof(GOSFSdirectory));
if (rc < 0)
goto fail;
/* Confirm this is empty */
rc = -1;
for (i = 0; i < MAX_FILES_PER_DIR; i++) {
if (dir->files[i].isUsed) {
rc = i;
break;
}
}
if (rc != -1) {
/* This directory isn't empty! */
rc = EINVALID;
goto fail;
}
/* Free single block */
Clear_Bit(superblock->freeBlocks, filePtr->node.blocks[0]);
} else {
/* We need to reclaim all of the blocks used by this file */
vblock = 0;
endBlock = (file->endPos + GOSFS_BLOCK_SIZE - 1) / GOSFS_BLOCK_SIZE;
while (vblock < endBlock) {
physBlock = getPhysicalBlockNum(instance, &filePtr->node, vblock);
Clear_Bit(superblock->freeBlocks, physBlock);
vblock++;
}
}
/* We should also clear out the file node in the directory */
memset(&filePtr->node, '\0', sizeof(GOSFSfileNode));
rc = readGOSFSBlock(instance->dev, filePtr->blockNum, dir,
sizeof(GOSFSdirectory));
if (rc < 0)
goto fail;
memcpy(&dir->files[filePtr->offset], &filePtr->node, sizeof(GOSFSfileNode));
rc = writeGOSFSBlock(instance->dev, filePtr->blockNum, dir,
sizeof(GOSFSdirectory));
/* Now we update the superblock */
rc = writeGOSFSBlock(instance->dev, GOSFS_SUPERBLOCK, superblock,
sizeof(GOSFSsuperblock));
if (rc < 0)
goto fail;
GOSFS_Close(file);
Free(file);
Free(dir);
return 1;
memfail: rc = ENOMEM;
goto fail;
fail: if (file) {
GOSFS_Close(file);
Free(file);
}
if (dir)
Free(dir);
return rc;
}
