Initial commit

libs/c/src/realloc.c

@@ -0,0 +1,33 @@
+/*
+ * K&R Malloc 
+ *
+ * System specifc code should implement `more_core'
+ */
+
+#include "k_r_malloc.h"
+#include <stdlib.h>
+#include <string.h>
+
+void *
+realloc(void *ptr, size_t size)
+{
+	Header *bp;
+	void *new_ptr;
+	size_t old_size;
+
+	if (ptr == NULL)
+		return malloc(size);
+	bp = (Header *) ptr - 1; /* point to block header */
+	old_size = sizeof(Header) * bp->s.size;
+	new_ptr = malloc(size);
+	if (new_ptr == NULL) {
+		return NULL;
+	}
+	if (old_size <= size) {
+		memcpy(new_ptr, ptr, old_size);
+	} else {
+		memcpy(new_ptr, ptr, size);
+	}
+	free(ptr);
+	return new_ptr;
+}