1 files changed, 111 insertions, 5 deletions

diff --git a/string-list.c b/string-list.c
index d9810aba42..480173fe6d 100644
--- a/string-list.c
+++ b/string-list.c
@@ -92,6 +92,23 @@ struct string_list_item *string_list_lookup(struct string_list *list, const char
 	return list->items + i;
 }
 
+void string_list_remove_duplicates(struct string_list *list, int free_util)
+{
+	if (list->nr > 1) {
+		int src, dst;
+		for (src = dst = 1; src < list->nr; src++) {
+			if (!strcmp(list->items[dst - 1].string, list->items[src].string)) {
+				if (list->strdup_strings)
+					free(list->items[src].string);
+				if (free_util)
+					free(list->items[src].util);
+			} else
+				list->items[dst++] = list->items[src];
+		}
+		list->nr = dst;
+	}
+}
+
 int for_each_string_list(struct string_list *list,
 			 string_list_each_func_t fn, void *cb_data)
 {
@@ -102,6 +119,32 @@ 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 want, void *cb_data)
+{
+	int src, dst = 0;
+	for (src = 0; src < list->nr; src++) {
+		if (want(&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;
+}
+
+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);
+}
+
 void string_list_clear(struct string_list *list, int free_util)
 {
 	if (list->items) {
@@ -148,13 +191,23 @@ void print_string_list(const struct string_list *p, const char *text)
 		printf("%s:%p\n", p->items[i].string, p->items[i].util);
 }
 
-struct string_list_item *string_list_append(struct string_list *list, const char *string)
+struct string_list_item *string_list_append_nodup(struct string_list *list,
+						  char *string)
 {
+	struct string_list_item *retval;
 	ALLOC_GROW(list->items, list->nr + 1, list->alloc);
-	list->items[list->nr].string =
-		list->strdup_strings ? xstrdup(string) : (char *)string;
-	list->items[list->nr].util = NULL;
-	return list->items + list->nr++;
+	retval = &list->items[list->nr++];
+	retval->string = string;
+	retval->util = NULL;
+	return retval;
+}
+
+struct string_list_item *string_list_append(struct string_list *list,
+					    const char *string)
+{
+	return string_list_append_nodup(
+			list,
+			list->strdup_strings ? xstrdup(string) : (char *)string);
 }
 
 static int cmp_items(const void *a, const void *b)
@@ -194,3 +247,56 @@ void unsorted_string_list_delete_item(struct string_list *list, int i, int free_
 	list->items[i] = list->items[list->nr-1];
 	list->nr--;
 }
+
+int string_list_split(struct string_list *list, const char *string,
+		      int delim, int maxsplit)
+{
+	int count = 0;
+	const char *p = string, *end;
+
+	if (!list->strdup_strings)
+		die("internal error in string_list_split(): "
+		    "list->strdup_strings must be set");
+	for (;;) {
+		count++;
+		if (maxsplit >= 0 && count > maxsplit) {
+			string_list_append(list, p);
+			return count;
+		}
+		end = strchr(p, delim);
+		if (end) {
+			string_list_append_nodup(list, xmemdupz(p, end - p));
+			p = end + 1;
+		} else {
+			string_list_append(list, p);
+			return count;
+		}
+	}
+}
+
+int string_list_split_in_place(struct string_list *list, char *string,
+			       int delim, int maxsplit)
+{
+	int count = 0;
+	char *p = string, *end;
+
+	if (list->strdup_strings)
+		die("internal error in string_list_split_in_place(): "
+		    "list->strdup_strings must not be set");
+	for (;;) {
+		count++;
+		if (maxsplit >= 0 && count > maxsplit) {
+			string_list_append(list, p);
+			return count;
+		}
+		end = strchr(p, delim);
+		if (end) {
+			*end = '\0';
+			string_list_append(list, p);
+			p = end + 1;
+		} else {
+			string_list_append(list, p);
+			return count;
+		}
+	}
+}