From 02abe1ac77d10434ed4aca9029bd33dc80a3d4f7 Mon Sep 17 00:00:00 2001
From: Orestis <orestis.malaspinas@pm.me>
Date: Tue, 27 Feb 2024 11:48:58 +0100
Subject: [PATCH] added hm
---
slides/exemples/hashmap/Makefile | 15 ++++++++
slides/exemples/hashmap/hm.c | 59 ++++++++++++++++++++++++++++++++
slides/exemples/hashmap/hm.h | 28 +++++++++++++++
slides/exemples/hashmap/main.c | 31 +++++++++++++++++
4 files changed, 133 insertions(+)
create mode 100644 slides/exemples/hashmap/Makefile
create mode 100644 slides/exemples/hashmap/hm.c
create mode 100644 slides/exemples/hashmap/hm.h
create mode 100644 slides/exemples/hashmap/main.c
diff --git a/slides/exemples/hashmap/Makefile b/slides/exemples/hashmap/Makefile
new file mode 100644
index 0000000..096c299
--- /dev/null
+++ b/slides/exemples/hashmap/Makefile
@@ -0,0 +1,15 @@
+CC:=clang
+CFLAGS:=-Wall -Wextra -pedantic -g -fsanitize=address,undefined
+LDFLAGS:=-fsanitize=address,undefined
+
+main: main.o hm.o
+ $(CC) main.o hm.o -o main $(LDFLAGS)
+
+main.o: main.c hm.h
+ $(CC) -c main.c -o main.o $(CFLAGS)
+
+hm.o: hm.c hm.h
+ $(CC) -c hm.c -o hm.o $(CFLAGS)
+
+clean:
+ rm -f *.o main
\ No newline at end of file
diff --git a/slides/exemples/hashmap/hm.c b/slides/exemples/hashmap/hm.c
new file mode 100644
index 0000000..631eafe
--- /dev/null
+++ b/slides/exemples/hashmap/hm.c
@@ -0,0 +1,59 @@
+#include <string.h>
+#include "hm.h"
+
+static size_t hash(char *key, size_t table_capacity) {
+ size_t h = 0;
+ for (size_t i = 0; i < strlen(key); ++i) {
+ h = (h + key[i] * 43) % table_capacity;
+ }
+ return h;
+}
+
+void hm_init(hm_t *hm, size_t table_capacity) {
+ hm->table = malloc(sizeof(*(hm->table)) * table_capacity);
+ hm->table_capacity = table_capacity;
+ hm->table_length = 0;
+ for (size_t i = 0; i < hm->table_capacity; ++i) {
+ hm->table[i].state = EMPTY;
+ }
+}
+
+void hm_destroy(hm_t *hm) {
+ free(hm->table);
+ hm->table = NULL;
+ hm->table_capacity = 0;
+ hm->table_length = 0;
+}
+
+void hm_insert(hm_t *hm, char *key, char *value) {
+ if (hm->table_capacity == hm->table_length) {
+ return;
+ }
+ size_t index = hash(key, hm->table_capacity);
+ while(hm->table[index].state == OCCUPIED && (0 != strcmp(key, hm->table[index].key))) {
+ index = (index + 1) % hm->table_capacity;
+ }
+ if (hm->table[index].state != OCCUPIED) {
+ hm->table_length += 1;
+ strcpy(hm->table[index].key, key);
+ hm->table[index].state = OCCUPIED;
+ }
+ strcpy(hm->table[index].value, value);
+}
+
+void hm_remove(hm_t *hm, char *key) {
+ if (0 == hm->table_length) {
+ return;
+ }
+ size_t index = hash(key, hm->table_capacity);
+ while (hm->table[index].state == EMPTY &&
+ (0 != strcmp(key, hm->table[index].key))) {
+ index = (index + 1) % hm->table_capacity;
+ }
+ if (0 == strcmp(key, hm->table[index].key)) {
+ hm->table[index].state = DELETED;
+ hm->table[index].key[0] = '\0';
+ hm->table_length -= 1;
+ }
+}
+
diff --git a/slides/exemples/hashmap/hm.h b/slides/exemples/hashmap/hm.h
new file mode 100644
index 0000000..5bec3ff
--- /dev/null
+++ b/slides/exemples/hashmap/hm.h
@@ -0,0 +1,28 @@
+#ifndef HM_H
+#define HM_H
+
+#include <stdlib.h>
+
+#define MAX_SIZE 80
+
+typedef enum _state_t { EMPTY, OCCUPIED, DELETED } state_t;
+
+typedef struct _entry_t {
+ char key[MAX_SIZE];
+ char value[MAX_SIZE];
+ state_t state;
+} entry_t;
+
+typedef struct _hm_t {
+ entry_t *table;
+ size_t table_capacity;
+ size_t table_length;
+} hm_t;
+
+void hm_init(hm_t *hm, size_t table_capacity);
+void hm_destroy(hm_t *hm);
+
+void hm_insert(hm_t *hm, char *key, char *value);
+void hm_remove(hm_t *hm, char *key);
+
+#endif
diff --git a/slides/exemples/hashmap/main.c b/slides/exemples/hashmap/main.c
new file mode 100644
index 0000000..95a782e
--- /dev/null
+++ b/slides/exemples/hashmap/main.c
@@ -0,0 +1,31 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "hm.h"
+
+int main(int argc, char *argv[]) {
+ hm_t hm;
+ hm_init(&hm, 50);
+ printf("capacity = %zu, length = %zu\n", hm.table_capacity, hm.table_length);
+ char key1[] = "Orestis";
+ char value1[] = "1234567";
+ hm_insert(&hm, key1, value1);
+ hm_remove(&hm, key1);
+ char value2[] = "2345678";
+ hm_insert(&hm, key1, value2);
+ for (int i = 0; i < 50; ++i) {
+ if (hm.table[i].state == OCCUPIED) {
+ printf("key: %s, value %s\n", hm.table[i].key, hm.table[i].value);
+ }
+ }
+ for (int i = 0; i < 50; ++i) {
+ if (hm.table[i].state == OCCUPIED) {
+ printf("key: %s, value %s\n", hm.table[i].key, hm.table[i].value);
+ }
+ }
+ printf("capacity = %zu, length = %zu\n", hm.table_capacity, hm.table_length);
+
+
+ hm_destroy(&hm);
+ printf("capacity = %zu, length = %zu\n", hm.table_capacity, hm.table_length);
+ return EXIT_SUCCESS;
+}
--
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