From 4606672f2340d4945654701b043284dc0a868a6d Mon Sep 17 00:00:00 2001
From: Mosder <git@mosder.eu>
Date: Fri, 11 Sep 2026 16:32:15 +0200
Subject: feat: added some (very little) implementation for hashmap

---
 src/ds/hashmap.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 2 deletions(-)

diff --git a/src/ds/hashmap.c b/src/ds/hashmap.c
index b0e13ac..8a3608a 100644
--- a/src/ds/hashmap.c
+++ b/src/ds/hashmap.c
@@ -1,11 +1,85 @@
 #define MOS_FORCE_PREFIXES
 #include "moslib/ds/hashmap.h"
 
+#include <string.h>
+
+#include "moslib/safe.h"
+#include "moslib/string.h"
+
+typedef struct {
+    size_t size;
+    size_t cap;
+    uint32_t (*hash)(const void *key);
+    int (*eq)(const void *key1, const void *key2);
+} Header;
+
+Header *hm2hdr(const void *hm) {
+    return (Header *)hm - 1;
+}
+
+void *hdr2hm(Header *hdr) {
+    return hdr + 1;
+}
+
+uint32_t default_hash(const void *key, size_t key_size) {
+    return 0;
+}
+
+int default_eq(const void *key1, const void *key2, size_t key_size) {
+    return memcmp(key1, key2, key_size) == 0;
+}
+
+uint32_t string_hash(const void *key) {
+    return 0;
+}
+
+int string_eq(const void *key1, const void *key2) {
+    return strcmp(key1, key2) == 0;
+}
+
+uint32_t slice_hash(const void *key) {
+    return 0;
+}
+
+int slice_eq(const void *key1, const void *key2) {
+    return mos_ss_eq(*(MosStringSlice *)key1, *(MosStringSlice *)key2);
+}
+
 void *mos_hm_new_fn(MosHmInitArgs args) {
-    (void)args;
-    return NULL;
+    Header *hdr = mos_safe_malloc(sizeof(Header));
+    hdr->cap = 0;
+    hdr->size = 0;
+
+    switch (args.key) {
+        case DEFAULT:
+            hdr->hash = NULL;
+            hdr->eq = NULL;
+            break;
+        case STR:
+            hdr->hash = string_hash;
+            hdr->eq = string_eq;
+            break;
+        case SS:
+            hdr->hash = slice_hash;
+            hdr->eq = slice_eq;
+            break;
+    }
+
+    if (args.eq != NULL)
+        hdr->eq = args.eq;
+    if (args.hash != NULL)
+        hdr->hash = args.hash;
+
+    return hdr;
 }
 
+#define mos_hm_put(hm, key, ...)
+#define mos_hm_put_e(hm, ...)
+#define mos_hm_get(hm, key) 0
+#define mos_hm_get_e(hm, key) NULL
+#define mos_hm_first(hm) NULL
+#define mos_hm_next(hm, curr) NULL
+
 void mos_hm_free(void *hm) {
     (void)hm;
 }
-- 
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