Replaced arena

include/platform/mem/ci2_arena.h

@@ -23,16 +23,7 @@ SOFTWARE.
 #ifndef CI2_ARENA_H
 #define CI2_ARENA_H
 
-#include "../ci2_platform.h"
+#include <stddef.h>
-#include "../error/ci2_exception.h"
-
-enum
-{
-	DEFAULT = 0,				 /* default: fail-handler (throws) + zero */
-	SOFT_FAIL = 1u << 0, /* on failure return NULL */
-	HARD_FAIL = 1u << 1, /* on failure call abort() */
-	NO_ZERO = 1u << 2,	 /* do not zero memory on success */
-};
 
 struct Arena
 {
@@ -41,27 +32,24 @@ struct Arena
 };
 typedef struct Arena Arena;
 
-/* Forward definition of an exception */
+/* Initialize an Arena with an existing buffer  */
-CI2_API struct Exception arena_oom;
+extern void
+arena_back(struct Arena* a, char* buf, ptrdiff_t len);
 
-/* Initialize an Arena from a buffer. */
+/* Allocate a new Arena */
-CI2_API void
+extern struct Arena
-arena_init(struct Arena* a, void* buf, ptrdiff_t len);
-
-/* Dynamically allocate an Arena */
-CI2_API struct Arena
 arena_new(ptrdiff_t cap);
 
-/* Get the remaining capicity of an arena. */
+/* Get the current capacity of an Arena */
-CI2_API ptrdiff_t
+extern ptrdiff_t
-arena_size(struct Arena a);
+arena_capacity(struct Arena a);
 
-/* Make an allocation from an Arena. */
+/* Make an allocation from an Arena and do not zero.*/
-CI2_API void*
+extern void*
-arena_alloc(struct Arena* a,
+arena_malloc(struct Arena* a, ptrdiff_t size, ptrdiff_t align, ptrdiff_t count);
-						int flags,
+
-						ptrdiff_t size,
+/* Make an allocation from an Arena and zero.*/
-						ptrdiff_t align,
+extern void*
-						ptrdiff_t count);
+arena_calloc(struct Arena* a, ptrdiff_t size, ptrdiff_t align, ptrdiff_t count);
 
 #endif // ci2_arena.h

src/ci2_arena.c

@@ -21,21 +21,22 @@ SOFTWARE.
 
  * --------------------------------------------------------------------------*/
 #include "../include/platform/mem/ci2_arena.h"
-#include <string.h>
+#include <assert.h>
+#include <stdint.h>
 #include <stdlib.h>
-struct Exception arena_oom = {"Arena is out of memory!"};
+#include <string.h>
 
-/* Initialize an Arena from a buffer. */
+/* Initialize an Arena with an existing buffer  */
 void
-arena_init(struct Arena* a, void* buf, ptrdiff_t len)
+arena_back(struct Arena* a, char* buf, ptrdiff_t len)
 {
-	CI2_ASSERT(buf != NULL);
+  assert(a != NULL);
-	CI2_ASSERT(len > 0);
+  assert(buf != NULL);
-	a->beg = (char*)buf;
+  a->beg = buf;
-	a->end = (char*)buf + len;
+  a->end = buf + len;
 }
 
-/* Dynamically allocate an Arena */
+/* Allocate a new Arena */
 struct Arena
 arena_new(ptrdiff_t cap)
 {
@@ -45,36 +46,40 @@ arena_new(ptrdiff_t cap)
   return a;
 }
 
-/* Get the remaining capicity of an arena. */
+/* Get the current capacity of an Arena */
 ptrdiff_t
-arena_size(struct Arena a)
+arena_capacity(struct Arena a)
 {
   ptrdiff_t res = a.end - a.beg;
   return res;
 }
 
-/* Make an allocation from an Arena. */
+/* Make an allocation from an Arena and do not zero.*/
 void*
-arena_alloc(struct Arena* a,
+arena_calloc(struct Arena* a, ptrdiff_t size, ptrdiff_t align, ptrdiff_t count)
-						int flags,
-						ptrdiff_t size,
-						ptrdiff_t align,
-						ptrdiff_t count)
 {
   ptrdiff_t padding = -(uintptr_t)a->beg & (align - 1);
   ptrdiff_t available = a->end - a->beg - padding;
   if (available < 0 || count > available / size) {
-		if (flags & SOFT_FAIL)
+    return NULL;
-			return 0;
-
-		if (flags & HARD_FAIL)
-			CI2_DEBUG_TRAP();
-
-		CI2_RAISE(arena_oom);
   }
-	void* p = a->beg + padding;
   ptrdiff_t total = padding + count * size;
+  void* p = a->beg + total;
   a->beg += total;
-  return flags & NO_ZERO ? p : memset(p, 0, total);
+  return memset(p, 0, total);
 }
 
+/* Make an allocation from an Arena and zero.*/
+void*
+arena_malloc(struct Arena* a, ptrdiff_t size, ptrdiff_t align, ptrdiff_t count)
+{
+  ptrdiff_t padding = -(uintptr_t)a->beg & (align - 1);
+  ptrdiff_t available = a->end - a->beg - padding;
+  if (available < 0 || count > available / size) {
+    return NULL;
+  }
+  ptrdiff_t total = padding + count * size;
+  void* p = a->beg + total;
+  a->beg += total;
+  return p;
+}