[PATCH 3/7] dir: add method to check if a dir_entry lexically contains another

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Introduce a method that allows us to check if one dir_entry corresponds
to a path which contains the path corresponding to another dir_entry.
---
 dir.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dir.c b/dir.c
index 6bd0350e9..25cb9eadf 100644
--- a/dir.c
+++ b/dir.c
@@ -1852,6 +1852,14 @@ static int cmp_name(const void *p1, const void *p2)
 	return name_compare(e1->name, e1->len, e2->name, e2->len);
 }
 
+// check if *out lexically contains *in
+static int check_contains(const struct dir_entry *out, const struct dir_entry *in)
+{
+	return (out->len < in->len) &&
+			(out->name[out->len - 1] == '/') &&
+			!memcmp(out->name, in->name, out->len);
+}
+
 static int treat_leading_path(struct dir_struct *dir,
 			      const char *path, int len,
 			      const struct pathspec *pathspec)
-- 
2.12.2




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