Added allocator using buddy system

tests/Makefile.am

@@ -1,6 +1,9 @@
 if BUILD_TESTS
-    noinst_PROGRAMS = test_bitmapalloc
+    noinst_PROGRAMS = test_bitmapalloc test_buddyalloc
 
     test_bitmapalloc_SOURCES = test_bitmapalloc.c
     test_bitmapalloc_LDADD = ../src/libmalloc.a
+
+    test_buddyalloc_SOURCES = test_buddyalloc.c
+    test_buddyalloc_LDADD = ../src/libmalloc.a
 endif

tests/test_buddyalloc.c

@@ -0,0 +1,102 @@
+#include "libmalloc/buddy_alloc.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct memblock_t
+{
+    unsigned long size;
+    unsigned long location;
+} memblock_t;
+
+void print_heap(FILE *file, buddy_descriptor_t *heap)
+{
+    unsigned long count = 1UL << heap->max_kval;
+    fprintf(file, "heap {\n");
+    fprintf(file, "\t.block_size = %lu\n", heap->block_size);
+    fprintf(file, "\t.max_kval = %lu\n", heap->max_kval);
+    fprintf(file, "\t.offset = %lu\n", heap->offset);
+    fprintf(file, "\t.block_map = {\n");
+    for(unsigned int i = 0; i < count; i++)
+    {
+        unsigned long linkf_diff = heap->block_map[i].linkf - heap->block_map;
+        unsigned long linkb_diff = heap->block_map[i].linkb - heap->block_map;
+        fprintf(file, "\t\t%u: {.tag = %s, .kval = %lu, .linkf = %li, .linkb = %li}\n",
+            i,
+            heap->block_map[i].tag ? "BLOCK_FREE" : "BLOCK_RESERVED",
+            heap->block_map[i].kval,
+            linkf_diff < count ? linkf_diff : -1,
+            linkb_diff < count ? linkb_diff : -1);
+    }
+    fprintf(file, "\t}\n");
+    fprintf(file, "\t.avail = {\n");
+    for(unsigned int i = 0; i <= heap->max_kval; i++)
+    {
+        fprintf(file, "\t\t%u: {.linkf = %lu, .linkb = %lu}\n",
+            i,
+            heap->avail[i].linkf - heap->block_map,
+            heap->avail[i].linkb - heap->block_map);
+    }
+    fprintf(file, "\t}\n}\n");
+}
+
+int main(int argc, char **argv)
+{
+    unsigned long mem_size;
+    unsigned long block_size;
+    sscanf(argv[1], "%lu", &mem_size);
+    sscanf(argv[2], "%lu", &block_size);
+
+    FILE *out = fopen("debug_output.txt", "w");
+    if(out == NULL)
+    {
+        fprintf(stderr, "Failed to open debug output.\n");
+        return 0;
+    }
+
+    memory_map_t memory_map = {
+        .array = malloc(sizeof(memory_region_t) * 16),
+        .capacity = 16,
+        .size = 0
+    };
+
+    buddy_descriptor_t heap = {
+        .avail = malloc(sizeof(buddy_block_t) * 20),
+        .block_map = malloc(buddy_map_size(&memory_map, block_size)),
+        .block_size = block_size,
+        .mmap = NULL,
+        .offset = 0
+    };
+
+    memmap_insert_region(&memory_map, 0, mem_size, M_AVAILABLE);
+    if(buddy_alloc_init(&heap, &memory_map))
+    {
+        fprintf(stderr, "Failed to initialize buddy allocator.\n");
+        return 0;
+    }
+
+    print_heap(out, &heap);
+
+    memblock_t *blocks = calloc(mem_size / block_size, sizeof(memblock_t));
+
+    for(int i = 0; i < 1024; i++)
+    {
+        int index = rand() % (mem_size / block_size);
+        if(blocks[index].size == 0)
+        {
+            blocks[index].size = 1;
+            blocks[index].location = buddy_reserve(&heap, 1);
+            fprintf(out, "RESERVED %lu\n", blocks[index].location / heap.block_size);
+        }
+        else
+        {
+            buddy_free(&heap, blocks[index].location);
+            blocks[index].size = 0;
+            fprintf(out, "FREED %lu\n", blocks[index].location / heap.block_size);
+        }
+        print_heap(out, &heap);
+    }
+
+    print_heap(out, &heap);
+
+    return 0;
+}