Re: [PATCH 1/3] stringlist-functions: add sorted insert

Re: [PATCH 1/3] stringlist-functions: add sorted insert

[Sascha Hauer]

On Thu, Dec 15, 2011 at 10:23:03AM +0100, Alexander Aring wrote:
> Add sorted insert in stringlist functions.
> Also added function to checked if string is already
> in string list.
> 
> Signed-off-by: Alexander Aring <a.aring@phytec.de>
> ---
>  include/stringlist.h |    2 ++
>  lib/stringlist.c     |   40 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 42 insertions(+), 0 deletions(-)
> 
> diff --git a/include/stringlist.h b/include/stringlist.h
> index 3453e9a..c923542 100644
> --- a/include/stringlist.h
> +++ b/include/stringlist.h
> @@ -9,6 +9,8 @@ struct string_list {
>  };
>  
>  int string_list_add(struct string_list *sl, char *str);
> +int string_list_add_sorted(struct string_list *sl, char *str);
> +int string_list_contains(struct string_list *sl, char *str);
>  void string_list_print_by_column(struct string_list *sl);
>  
>  static inline void string_list_init(struct string_list *sl)
> diff --git a/lib/stringlist.c b/lib/stringlist.c
> index 9ccf8fa..65c0117 100644
> --- a/lib/stringlist.c
> +++ b/lib/stringlist.c
> @@ -3,6 +3,21 @@
>  #include <malloc.h>
>  #include <stringlist.h>
>  
> +static int string_list_compare(struct list_head *a, struct list_head *b)
> +{
> +	int result = 0;
> +	char *astr, *bstr;
> +	astr = ((struct string_list *)(a))->str;
> +	bstr = ((struct string_list *)(b))->str;

Please do not cast to pointers of different types directly. Use
container_of or list_entry.

> +
> +	result = strcmp(astr, bstr);
> +
> +	/* Avoid a endless loop because >=0 insert str in list
> +	 * Insert string if strings are equal or is equal,
> +	 * but lengths are not the same */
> +	return result;

I don't understand this comment. Is it valid?

> +}
> +
>  int string_list_add(struct string_list *sl, char *str)
>  {
>  	struct string_list *new;
> @@ -16,6 +31,31 @@ int string_list_add(struct string_list *sl, char *str)
>  	return 0;
>  }
>  
> +int string_list_add_sorted(struct string_list *sl, char *str)
> +{
> +	struct string_list *new;
> +
> +	new = xmalloc(sizeof(struct string_list) + strlen(str) + 1);
> +
> +	strcpy(new->str, str);
> +
> +	list_add_sort(&new->list, &sl->list, string_list_compare);
> +
> +	return 0;
> +}
> +
> +int string_list_contains(struct string_list *sl, char *str)
> +{
> +	struct string_list *entry;
> +
> +	list_for_each_entry(entry, &sl->list, list) {
> +		if (!strcmp(str, entry->str))
> +			return 1;
> +	}
> +
> +	return 0;
> +}
> +
>  void string_list_print_by_column(struct string_list *sl)
>  {
>  	int len = 0, num, i;
> -- 
> 1.7.0.4
> 
> 

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