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symtablehash.c
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symtablehash.c
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#include "symtable.h"
#define HASH_MULTIPLIER 65599
#define buckets 509
SymTable_T *htable[buckets];
struct node{
char *key;
void *value;
struct node *next;
};
/* Return a hash code for pcKey. */
static unsigned int SymTable_hash(const char *pcKey){
size_t ui;
unsigned int uiHash = 0U;
for (ui = 0U; pcKey[ui] != '\0'; ui++)
uiHash = uiHash * HASH_MULTIPLIER + pcKey[ui];
return uiHash;
}
/*H synarthsh auth epistrefei ena kainourgio SymTable_T pou einai adeio.*/
SymTable_T SymTable_new(void){
SymTable_T *cell;
int i;
for(i=0; i<509; i++)
cell[i]=NULL;
return (*cell);
}
/*H synarthsh auth prepei na eleu8erwnei olh th mnhmh pou xrhsimopoihtai apo to oSymtable
An to oSymtable einai NULL h ynarthsh den kanei tipota.*/
void SymTable_free( SymTable_T oSymTable){
assert(oSymTable != NULL);
SymTable_T *cell = &oSymTable;
int i;
for(i=0; i<509; i++){
if(cell[i] != NULL){
SymTable_T temp1 = cell[i];
SymTable_T temp2;
while(temp1->next != NULL){
temp2=temp1->next;
free(temp1);
temp1=temp2;
}
free(temp2);
}
}
}
/*H synarthsh auth prepei na epistrefei ton ari8mo twn bindings sto oSymtable*/
unsigned int SymTable_getLength(SymTable_T oSymTable){
assert(oSymTable != NULL);
SymTable_T *cell = &oSymTable;
unsigned int i, res=0;
for(i=0; i<509; i++){
if(cell[i] != NULL){
SymTable_T temp = cell[i];
while(temp->next != NULL){
res++;
temp=temp->next;
}
}
}
return res;
}
/*H synarthsh auth prepei an den yparxei binding me kleidi pcKey sto oSymtable , na pros8etei ena
kainourgio binding me kleidi to pcKey kai thn timh value kai 8a epistrefei 1.Alliws den allazei
to oSymtable kai epistrefei 0 */
int SymTable_put(SymTable_T oSymTable, const char *pcKey, const void *pvValue){
int i;
assert(oSymTable != NULL);
i=SymTable_contains( oSymTable, pcKey);
if(i==0){
SymTable_T newnode, *cell, temp;
cell = &oSymTable;
int index = SymTable_hash(pcKey);
temp=cell[index];
while( temp->next!=NULL )
temp=temp->next;
newnode=malloc(sizeof(struct node));
temp->next=newnode;
newnode->next=NULL;
newnode->key=malloc(sizeof(strlen(pcKey)+1)*sizeof(char));
strcpy( newnode->key, pcKey );
newnode->value=(void *)pvValue;
return 1;
}
return 0;
}
/*H synarthsh auth prepei an yparxei binding me kleidi pcKey sto oSymtable , na afairei to
binding apo to oSymtable kai na epistrefei 1.Alliws den allazei to oSymtable kai
epistrefei 0 */
int SymTable_remove(SymTable_T oSymTable, const char *pcKey){
return 0;
}
/*H synarthsh auth prepei na epistrefei 1 an to oSymtable periexei ena binding tou opoiou to
kleidi einai pcKey kai 0 diaforetika. */
int SymTable_contains(SymTable_T oSymTable, const char *pcKey){
return 0;
}
/*H synarthsh auth prepei na epistrefei thn timh tou binding sto oSymtable tou opoiou
to kleidi einai pcKey h NULL an den uparxei tetoio binding. */
void *SymTable_get(SymTable_T oSymTable, const char *pcKey){
}
/*H synarthsh auth prepei na efarmozei thn sunarthsh *pfAplly se ka8e binding sto oSymtable
pernontas to pvExtra ws epipleon parametro.*/
void SymTable_map(SymTable_T oSymTable,
void (*pfApply)(const char *pcKey, void *pvValue, void *pvExtra),
const void *pvExtra){
}