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/*
* esh, the Unix shell with Lisp-like syntax.
* Copyright (C) 1999 Ivan Tkatchev
* This source code is under the GPL.
*/
#include <stdlib.h>
#include <string.h>
#include "gc.h"
#include "list.h"
#include "hash.h"
#define HASH_SIZE 1024
/*
* A simple but braindead hasher function.
*/
static int hash(char* key) {
int i = 0, j = 0;
if (!key) return 0;
while (key[j]) {
i += key[j++];
}
return i % HASH_SIZE;
}
static void* hash_put_aux(hash_table* _hash_array, char* key, void* data,
int doinc) {
hash_entry* hs_ent;
void* ret;
int idx = hash(key);
list* bucket = (*_hash_array)[idx];
list* iter;
int refs = gc_refs((*_hash_array));
int i;
for (iter = bucket; iter != NULL; iter = ls_next(iter)) {
if (strcmp(((hash_entry*)ls_data(iter))->key, key) == 0) {
hs_ent = (hash_entry*)ls_data(iter);
ret = hs_ent->data;
hs_ent->data = data;
if (doinc) {
for (i = 1; i < refs; i++) {
hs_ent->data = ls_copy(hs_ent->data);
ls_free_all(ret);
}
}
return ret;
}
}
hs_ent = (hash_entry*)gc_alloc(sizeof(hash_entry), "hash_put");
hs_ent->key = key;
hs_ent->data = data;
(*_hash_array)[idx] = ls_cons(hs_ent, bucket);
if (doinc) {
gc_add_ref((*_hash_array)[idx], refs-1);
gc_add_ref(hs_ent, refs-1);
gc_add_ref(hs_ent->key, refs-1);
for (i = 1; i < refs; i++) {
hs_ent->data = ls_copy(hs_ent->data);
}
}
return NULL;
}
inline void* hash_put(hash_table* tab, char* key, void* data) {
return hash_put_aux(tab, key, data, 0);
}
inline void* hash_put_inc_ref(hash_table* tab, char* key, void* data) {
return hash_put_aux(tab, key, data, 1);
}
void* hash_get(hash_table* _hash_array, char* key) {
int idx = hash(key);
list* bucket = (*_hash_array)[idx];
list* iter;
for (iter = bucket; iter != NULL; iter = ls_next(iter)) {
if (strcmp(((hash_entry*)ls_data(iter))->key, key) == 0)
return ((hash_entry*)ls_data(iter))->data;
}
return NULL;
}
void hash_init(hash_table* _hash_array, hash_entry data[]) {
int i;
(*_hash_array) = (list**)gc_alloc(sizeof(list*) * HASH_SIZE,
"hash_init");
for (i = 0; i < HASH_SIZE; i++)
(*_hash_array)[i] = NULL;
i = 0;
if (!data) return;
while (data[i].key != NULL) {
hash_put(_hash_array, data[i].key, data[i].data);
i++;
}
}
void hash_free(hash_table* tab,
void (*func1)(),
void (*func2)()) {
int i;
list* iter;
for (i = 0; i < HASH_SIZE; i++) {
for (iter = (*tab)[i]; iter != NULL; iter = ls_next(iter)) {
hash_entry* he = (hash_entry*)(ls_data(iter));
if (func1)
func1(he->key);
if (func2)
func2(he->data);
gc_free(he);
}
ls_free((*tab)[i]);
}
gc_free((*tab));
}
void hash_inc_ref(hash_table* tab) {
int i;
list* iter;
for (i = 0; i < HASH_SIZE; i++) {
for (iter = (*tab)[i]; iter != NULL; iter = ls_next(iter)) {
hash_entry* he = (hash_entry*)(ls_data(iter));
gc_inc_ref(iter);
gc_inc_ref(he);
gc_inc_ref(he->key);
he->data = ls_copy(he->data);
}
}
gc_inc_ref((*tab));
}
list* hash_keys(hash_table* tab) {
int i;
list* iter;
list* ret = NULL;
for (i = 0; i < HASH_SIZE; i++) {
for (iter = (*tab)[i]; iter != NULL; iter = ls_next(iter)) {
hash_entry* he = (hash_entry*)(ls_data(iter));
gc_inc_ref(he->key);
ret = ls_cons(he->key, ret);
}
}
return ret;
}
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