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-rw-r--r--hash.inc65
1 files changed, 65 insertions, 0 deletions
diff --git a/hash.inc b/hash.inc
new file mode 100644
index 00000000..34766b54
--- /dev/null
+++ b/hash.inc
@@ -0,0 +1,65 @@
+#ifndef TYPE
+#error "Set TYPE to something before including this header"
+#else
+
+#include "err.h"
+
+int HASH_PUT(TYPE) ( TABLE(TYPE)* table, TYPE* value) {
+ // TODO genicify the hash function
+ unsigned long h = hash(value->key.mem) % table->size;
+ TYPE* mem = table->values[h];
+
+ // fprintf(stderr, "INFO: %i: [%s] := [%s]\n", table->item_count, value->key.mem, value->val.mem);
+
+ /* TODO conflict resolution */
+ if (mem != NULL) ERR("Hash collision");
+ mem = value;
+
+ ++table->item_count;
+ return 0;
+}
+
+int HASH_INIT(TYPE) ( TABLE(TYPE)* table, int init_size ) {
+ /*
+ * TODO parts of table might not get properly initialized to 0
+ */
+ table->values = calloc(sizeof(table->values), init_size);
+ table->size = init_size;
+ table->item_count = 0;
+ return 0;
+}
+
+TYPE* HASH_GET(TYPE) ( TABLE(TYPE)* table, char* key ) {
+ unsigned long h = hash(key) % table->size;
+ TYPE* mem = table->values[h];
+ if (mem == NULL) {
+ fprintf(stderr, "Trying to access %s\n", key);
+ ERR("Nothing in field");
+ return 0;
+ } else if (strcmp(mem->key.mem, key) == 0) {
+ return mem;
+ } else {
+ /* TODO fix retrival on invalid key */
+ ERR("Other error");
+ return 0;
+ }
+}
+
+int HASH_FREE(TYPE) ( TABLE(TYPE)* table ) {
+ /*
+ * TODO an early return is possible by checking if all items have
+ * been found. table->item_count
+ */
+ for (int i = 0; i < table->size; i++) {
+ TYPE* mem = table->values[i];
+ if (mem == NULL) continue;
+
+ free(mem);
+ }
+ free(table->values);
+ return 0;
+}
+
+#endif /* TYPE */
+
+// vim: ft=c