1 files changed, 110 insertions, 0 deletions
diff --git a/malloclab-handout/mm.c b/malloclab-handout/mm.c
new file mode 100644
index 0000000..a482a43
--- /dev/null
+++ b/malloclab-handout/mm.c
@@ -0,0 +1,110 @@
+/*
+ * mm-naive.c - The fastest, least memory-efficient malloc package.
+ * 
+ * In this naive approach, a block is allocated by simply incrementing
+ * the brk pointer.  A block is pure payload. There are no headers or
+ * footers.  Blocks are never coalesced or reused. Realloc is
+ * implemented directly using mm_malloc and mm_free.
+ *
+ * NOTE TO STUDENTS: Replace this header comment with your own header
+ * comment that gives a high level description of your solution.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "mm.h"
+#include "memlib.h"
+
+/*********************************************************
+ * NOTE TO STUDENTS: Before you do anything else, please
+ * provide your team information in the following struct.
+ ********************************************************/
+team_t team = {
+    /* Team name */
+    "ateam",
+    /* First member's full name */
+    "Harry Bovik",
+    /* First member's email address */
+    "bovik@cs.cmu.edu",
+    /* Second member's full name (leave blank if none) */
+    "",
+    /* Second member's email address (leave blank if none) */
+    ""
+};
+
+/* single word (4) or double word (8) alignment */
+#define ALIGNMENT 8
+
+/* rounds up to the nearest multiple of ALIGNMENT */
+#define ALIGN(size) (((size) + (ALIGNMENT-1)) & ~0x7)
+
+
+#define SIZE_T_SIZE (ALIGN(sizeof(size_t)))
+
+/* 
+ * mm_init - initialize the malloc package.
+ */
+int mm_init(void)
+{
+    return 0;
+}
+
+/* 
+ * mm_malloc - Allocate a block by incrementing the brk pointer.
+ *     Always allocate a block whose size is a multiple of the alignment.
+ */
+void *mm_malloc(size_t size)
+{
+    int newsize = ALIGN(size + SIZE_T_SIZE);
+    void *p = mem_sbrk(newsize);
+    if (p == (void *)-1)
+	return NULL;
+    else {
+        *(size_t *)p = size;
+        return (void *)((char *)p + SIZE_T_SIZE);
+    }
+}
+
+/*
+ * mm_free - Freeing a block does nothing.
+ */
+void mm_free(void *ptr)
+{
+}
+
+/*
+ * mm_realloc - Implemented simply in terms of mm_malloc and mm_free
+ */
+void *mm_realloc(void *ptr, size_t size)
+{
+    void *oldptr = ptr;
+    void *newptr;
+    size_t copySize;
+    
+    newptr = mm_malloc(size);
+    if (newptr == NULL)
+      return NULL;
+    copySize = *(size_t *)((char *)oldptr - SIZE_T_SIZE);
+    if (size < copySize)
+      copySize = size;
+    memcpy(newptr, oldptr, copySize);
+    mm_free(oldptr);
+    return newptr;
+}
+
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