[ccan] [PATCH] darray: Add darray_insert() to insert a value at a specified index

[Damien Grassart]

This module currently supports removing but not inserting at a
specified index, so this adds that. Inserting a value moves all
existing data beyond index over one element.
---
 ccan/darray/darray.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ccan/darray/darray.h b/ccan/darray/darray.h
index 75112419..fca20b8a 100644
--- a/ccan/darray/darray.h
+++ b/ccan/darray/darray.h
@@ -56,6 +56,7 @@
  *
  *     void   darray_append(darray(T) arr, T item);
  *     void   darray_prepend(darray(T) arr, T item);
+ *     void   darray_insert(darray(T) arr, size_t index, T item);
  *     void   darray_push(darray(T) arr, T item); // same as darray_append
  *
  * Insertion (multiple items):
@@ -169,6 +170,12 @@ typedef darray(unsigned long)  darray_ulong;
 		memmove((arr).item+1, (arr).item, ((arr).size-1)*sizeof(*(arr).item)); \
 		(arr).item[0] = (__VA_ARGS__); \
 	} while(0)
+#define darray_insert(arr, index, ...) do { \
+		size_t __index = index; \
+		darray_resize(arr, (arr).size+1); \
+		memmove((arr).item+__index+1, (arr).item+__index, ((arr).size-__index-1)*sizeof(*(arr).item)); \
+		(arr).item[__index] = (__VA_ARGS__); \
+	} while(0)
 #define darray_push(arr, ...) darray_append(arr, __VA_ARGS__)
 
 
-- 
2.14.1