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

[David Gibson]

On Sun, Aug 27, 2017 at 09:40:57PM +0200, Damien Grassart wrote:
> This module currently supports removing but not inserting at a
> specified index, so this adds that along with some tests. Inserting a
> value moves all existing data beyond index over one element.
> 
> Signed-off-by: Damien Grassart <damien at grassart.com>

Applied, thanks.

> ---
>  ccan/darray/darray.h   |  7 +++++++
>  ccan/darray/test/run.c | 22 ++++++++++++++++++++--
>  2 files changed, 27 insertions(+), 2 deletions(-)
> 
> 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__)
>  
>  
> diff --git a/ccan/darray/test/run.c b/ccan/darray/test/run.c
> index 3d96fa56..5888af60 100644
> --- a/ccan/darray/test/run.c
> +++ b/ccan/darray/test/run.c
> @@ -38,7 +38,7 @@ int main(void) {
>  	trace("Generating amalgams (internal)");
>  	generateAmalgams();
>  	
> -	plan_tests(41);
> +	plan_tests(47);
>  	
>  	testLits();
>  	
> @@ -70,7 +70,25 @@ int main(void) {
>  		ok1(darray_size(arr) == 0);
>  	}
>  	reset(arr);
> -	
> +
> +	testing(darray_insert);
> +	{
> +		size_t middle_i;
> +
> +		for (i=0; i < ARRAY_SIZE(lotsOfNumbers); i++)
> +			darray_insert(arr, i, lotsOfNumbers[i]);
> +		ok1(darray_size(arr) == ARRAY_SIZE(lotsOfNumbers));
> +		ok1(darray_alloc(arr) >= darray_size(arr));
> +		ok1(!memcmp(arr.item, lotsOfNumbers, sizeof(lotsOfNumbers)));
> +
> +		middle_i = ARRAY_SIZE(lotsOfNumbers) / 2;
> +		darray_insert(arr, middle_i, 42);
> +		ok1(darray_size(arr) == ARRAY_SIZE(lotsOfNumbers) + 1);
> +		ok1(arr.item[middle_i] == 42);
> +		ok1(arr.item[middle_i + 1] == lotsOfNumbers[middle_i]);
> +	}
> +	reset(arr);
> +
>  	testing(darray_from_c, darray_foreach, darray_foreach_reverse);
>  	{
>  		long   *i;

-- 
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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