grep-dctrl: Allow distributing atom modifiers over a parenthesed predicate.

Signed-off-by: Antti-Juhani Kaijanaho <ajk@debian.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/lib/strlist.c b/lib/strlist.c
index c21a410..2877dc5 100644
--- a/lib/strlist.c
+++ b/lib/strlist.c
@@ -85,3 +85,17 @@ void strlist_iterator_next(struct strlist_iterator * it)
 {
         it->i++;
 }
+
+struct strlist_memento strlist_save(struct strlist *sl)
+{
+        struct strlist_memento rv = {
+                .sl = sl,
+                .n = sl->n
+        };
+        return rv;
+}
+void strlist_restore(struct strlist_memento mem)
+{
+        mem.sl->n = mem.n;
+}
+
diff --git a/lib/strlist.h b/lib/strlist.h
index da64623..d0de21a 100644
--- a/lib/strlist.h
+++ b/lib/strlist.h
@@ -24,12 +24,19 @@ struct strlist_iterator {
         struct strlist *sl;
         size_t i;
 };
+struct strlist_memento {
+        struct strlist *sl;
+        size_t n;
+};
 
 struct strlist *strlist_new(void);
 _Bool strlist_append(struct strlist *, const char *);
 _Bool strlist_is_empty(struct strlist *);
 void strlist_free(struct strlist *);
 
+struct strlist_memento strlist_save(struct strlist *);
+void strlist_restore(struct strlist_memento);
+
 struct strlist_iterator strlist_begin(struct strlist *);
 _Bool strlist_iterator_at_end(struct strlist_iterator);
 const char *strlist_iterator_get(struct strlist_iterator);