[PATCH 2/4] Add a new function, filter_string_list()
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
Documentation/technical/api-string-list.txt | 8 ++++++++
string-list.c | 17 +++++++++++++++++
string-list.h | 9 +++++++++
3 files changed, 34 insertions(+)
diff --git a/Documentation/technical/api-string-list.txt b/Documentation/technical/api-string-list.txt
index 3b959a2..15b8072 100644
--- a/Documentation/technical/api-string-list.txt
+++ b/Documentation/technical/api-string-list.txt
@@ -60,6 +60,14 @@ Functions
* General ones (works with sorted and unsorted lists as well)
+`filter_string_list`::
+
+ Apply a function to each item in a list, retaining only the
+ items for which the function returns true. If free_util is
+ true, call free() on the util members of any items that have
+ to be deleted. Preserve the order of the items that are
+ retained.
+
`print_string_list`::
Dump a string_list to stdout, useful mainly for debugging purposes. It
diff --git a/string-list.c b/string-list.c
index 110449c..72610ce 100644
--- a/string-list.c
+++ b/string-list.c
@@ -102,6 +102,23 @@ int for_each_string_list(struct string_list *list,
return ret;
}
+void filter_string_list(struct string_list *list, int free_util,
+ string_list_each_func_t fn, void *cb_data)
+{
+ int src, dst = 0;
+ for (src = 0; src < list->nr; src++) {
+ if (fn(&list->items[src], cb_data)) {
+ list->items[dst++] = list->items[src];
+ } else {
+ if (list->strdup_strings)
+ free(list->items[src].string);
+ if (free_util)
+ free(list->items[src].util);
+ }
+ }
+ list->nr = dst;
+}
+
void string_list_clear(struct string_list *list, int free_util)
{
if (list->items) {
diff --git a/string-list.h b/string-list.h
index 7e51d03..84996aa 100644
--- a/string-list.h
+++ b/string-list.h
@@ -29,6 +29,15 @@ int for_each_string_list(struct string_list *list,
#define for_each_string_list_item(item,list) \
for (item = (list)->items; item < (list)->items + (list)->nr; ++item)
+/*
+ * Apply fn to each item in list, retaining only the ones for which
+ * the function returns true. If free_util is true, call free() on
+ * the util members of any items that have to be deleted. Preserve
+ * the order of the items that are retained.
+ */
+void filter_string_list(struct string_list *list, int free_util,
+ string_list_each_func_t fn, void *cb_data);
+
/* Use these functions only on sorted lists: */
int string_list_has_string(const struct string_list *list, const char *string);
int string_list_find_insert_index(const struct string_list *list, const char *string,
--
1.7.11.3
Michael Haggerty <mhagger@alum.mit.edu>