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string_list: add a function string_list_remove_empty_items()

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Acked-by: Johan Herland <johan@herland.net>
Signed-off-by: Jeff King <peff@peff.net>
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commit 6bb2a1377b4b7a044f69d0107c38479180694fac 1 parent 9c50374
@mhagger mhagger authored peff committed
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9 Documentation/technical/api-string-list.txt
@@ -38,7 +38,8 @@ member (you need this if you add things later) and you should set the
`unsorted_string_list_delete_item`.
. Can remove items not matching a criterion from a sorted or unsorted
- list using `filter_string_list`.
+ list using `filter_string_list`, or remove empty strings using
+ `string_list_remove_empty_items`.
. Finally it should free the list using `string_list_clear`.
@@ -75,6 +76,12 @@ Functions
to be deleted. Preserve the order of the items that are
retained.
+`string_list_remove_empty_items`::
+
+ Remove any empty strings from the list. 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.
+
`string_list_longest_prefix`::
Return the longest string within a string_list that is a
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9 string-list.c
@@ -136,6 +136,15 @@ void filter_string_list(struct string_list *list, int free_util,
list->nr = dst;
}
+static int item_is_not_empty(struct string_list_item *item, void *unused)
+{
+ return *item->string != '\0';
+}
+
+void string_list_remove_empty_items(struct string_list *list, int free_util) {
+ filter_string_list(list, free_util, item_is_not_empty, NULL);
+}
+
char *string_list_longest_prefix(const struct string_list *prefixes,
const char *string)
{
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7 string-list.h
@@ -39,6 +39,13 @@ void filter_string_list(struct string_list *list, int free_util,
string_list_each_func_t want, void *cb_data);
/*
+ * Remove any empty strings from the list. 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 string_list_remove_empty_items(struct string_list *list, int free_util);
+
+/*
* Return the longest string in prefixes that is a prefix (in the
* sense of prefixcmp()) of string, or NULL if no such prefix exists.
* This function does not require the string_list to be sorted (it
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