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string-list: Add API to remove an item from an unsorted list

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Teach the string-list API how to remove an entry in O(1) runtime by
moving the last entry to the vacated spot. As such, the routine works
only for unsorted lists.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Sixt 2011-08-11 23:20:00 -06:00 committed by Junio C Hamano
parent aacb82de3f
commit 86d4b528d8
3 changed files with 20 additions and 0 deletions
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10
Documentation/technical/api-string-list.txt
View File

@ -29,6 +29,9 @@ member (you need this if you add things later) and you should set the
. Can sort an unsorted list using `sort_string_list`.
. Can remove individual items of an unsorted list using
`unsorted_string_list_delete_item`.
. Finally it should free the list using `string_list_clear`.
Example:
@ -112,6 +115,13 @@ write `string_list_insert(...)->util = ...;`.
The above two functions need to look through all items, as opposed to their
counterpart for sorted lists, which performs a binary search.
`unsorted_string_list_delete_item`::
Remove an item from a string_list. The `string` pointer of the items
will be freed in case the `strdup_strings` member of the string_list
is set. The third parameter controls if the `util` pointer of the
items should be freed or not.
Data structures
---------------

9
string-list.c
View File

@ -185,3 +185,12 @@ int unsorted_string_list_has_string(struct string_list *list,
return unsorted_string_list_lookup(list, string) != NULL;
}
void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util)
{
if (list->strdup_strings)
free(list->items[i].string);
if (free_util)
free(list->items[i].util);
list->items[i] = list->items[list->nr-1];
list->nr--;
}

1
string-list.h
View File

@ -44,4 +44,5 @@ void sort_string_list(struct string_list *list);
int unsorted_string_list_has_string(struct string_list *list, const char *string);
struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
const char *string);
void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util);
#endif /* STRING_LIST_H */