From 967be9e750221ab2ab783f95df79bb26d290a45e Mon Sep 17 00:00:00 2001
From: Martial Simon <msimon_fr@hotmail.com>
Date: Mon, 15 Sep 2025 01:07:58 +0200
Subject: add: added projects

---
 malloc/block_allocator/allocator.c | 61 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 malloc/block_allocator/allocator.c

(limited to 'malloc/block_allocator/allocator.c')

diff --git a/malloc/block_allocator/allocator.c b/malloc/block_allocator/allocator.c
new file mode 100644
index 0000000..0cf9af6
--- /dev/null
+++ b/malloc/block_allocator/allocator.c
@@ -0,0 +1,61 @@
+#include "allocator.h"
+
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+size_t align(size_t size, size_t al)
+{
+    size_t padding = size % al;
+    if (padding)
+        padding = al - padding;
+    size_t res;
+    if (__builtin_uaddl_overflow(size, padding, &res))
+        return 0;
+    return res;
+}
+
+struct blk_allocator *blka_new(void)
+{
+    struct blk_allocator *new = malloc(sizeof(struct blk_allocator));
+    new->meta = NULL;
+    return new;
+}
+
+struct blk_meta *blka_alloc(struct blk_allocator *blka, size_t size)
+{
+    long page_size = sysconf(_SC_PAGESIZE);
+    size_t aligned_size = align(size + sizeof(struct blk_meta), page_size);
+    struct blk_meta *meta = mmap(NULL, aligned_size, PROT_READ | PROT_WRITE,
+                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (meta == MAP_FAILED)
+        return NULL;
+    meta->size = aligned_size - sizeof(struct blk_meta);
+    meta->next = blka->meta;
+    blka->meta = meta;
+    return meta;
+}
+
+void blka_free(struct blk_meta *blk)
+{
+    munmap(blk, blk->size + sizeof(struct blk_meta));
+}
+
+void blka_pop(struct blk_allocator *blka)
+{
+    if (blka->meta == NULL)
+        return;
+
+    struct blk_meta *meta = blka->meta;
+    blka->meta = blka->meta->next;
+    blka_free(meta);
+}
+
+void blka_delete(struct blk_allocator *blka)
+{
+    while (blka->meta)
+    {
+        blka_pop(blka);
+    }
+    free(blka);
+}
-- 
cgit v1.2.3