Add mem_heap_dup().

include/mem0mem.h

@@ -322,6 +322,17 @@ mem_heap_strcat(
 	const char*	s1,	/* in: string 1 */
 	const char*	s2);	/* in: string 2 */
 
+/**************************************************************************
+Duplicate a block of data, allocated from a memory heap. */
+
+void*
+mem_heap_dup(
+/*=========*/
+				/* out, own: a copy of the data */
+	mem_heap_t*	heap,	/* in: memory heap where copy is allocated */
+	const void*	data,	/* in: data to be copied */
+	ulint		len);	/* in: length of data, in bytes */
+
 #ifdef MEM_PERIODIC_CHECK
 /**********************************************************************
 Goes through the list of all allocated mem blocks, checks their magic

mem/mem0mem.c

@@ -110,8 +110,21 @@ mem_heap_strdup(
 	mem_heap_t*	heap,	/* in: memory heap where string is allocated */
 	const char*	str)	/* in: string to be copied */
 {
-	ulint	len = strlen(str) + 1;
-	return(memcpy(mem_heap_alloc(heap, len), str, len));
+	return(mem_heap_dup(heap, str, strlen(str) + 1));
+}
+
+/**************************************************************************
+Duplicate a block of data, allocated from a memory heap. */
+
+void*
+mem_heap_dup(
+/*=========*/
+				/* out, own: a copy of the data */
+	mem_heap_t*	heap,	/* in: memory heap where copy is allocated */
+	const void*	data,	/* in: data to be copied */
+	ulint		len)	/* in: length of data, in bytes */
+{
+	return(memcpy(mem_heap_alloc(heap, len), data, len));
 }
 
 /**************************************************************************