From: Damien Grassart <damien@grassart.com>
To: ccan@lists.ozlabs.org
Subject: [PATCH] darray: Add darray_insert() to insert a value at a specified index
Date: Sat, 26 Aug 2017 20:01:08 +0200 [thread overview]
Message-ID: <20170826180108.20693-1-damien@grassart.com> (raw)
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
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next reply other threads:[~2017-08-26 18:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-26 18:01 Damien Grassart [this message]
2017-08-27 2:59 ` [PATCH] darray: Add darray_insert() to insert a value at a specified index David Gibson
2017-08-27 19:40 ` Damien Grassart
2017-08-28 2:42 ` David Gibson
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