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

[David Gibson]

On Sat, Aug 26, 2017 at 08:01:08PM +0200, Damien Grassart wrote:
> 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.

Looks good but I need an S-o-b.  Adding a testcase would also be good.

> ---
>  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__)
>  
>  

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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