Merge PR #13137: [ltac] Avoid magic numbers

Reviewed-by: herbelin

2 files changed, 7 insertions, 0 deletions

diff --git a/clib/cString.ml b/clib/cString.ml
index dcada4c18f..9d2c3729b2 100644
--- a/clib/cString.ml
+++ b/clib/cString.ml
@@ -25,6 +25,7 @@ sig
   val ordinal : int -> string
   val is_sub : string -> string -> int -> bool
   val is_prefix : string -> string -> bool
+  val is_suffix : string -> string -> bool
   module Set : Set.S with type elt = t
   module Map : CMap.ExtS with type key = t and module Set := Set
   module List : CList.MonoS with type elt = t
@@ -105,6 +106,9 @@ let is_sub p s off =
 let is_prefix p s =
   is_sub p s 0
 
+let is_suffix p s =
+  is_sub p s (String.length s - String.length p)
+
 let plural n s = if n<>1 then s^"s" else s
 
 let conjugate_verb_to_be n = if n<>1 then "are" else "is"
diff --git a/clib/cString.mli b/clib/cString.mli
index 0f78e66573..be8a202b64 100644
--- a/clib/cString.mli
+++ b/clib/cString.mli
@@ -54,6 +54,9 @@ sig
   val is_prefix : string -> string -> bool
   (** [is_prefix p s] tests whether [p] is a prefix of [s]. *)
 
+  val is_suffix : string -> string -> bool
+  (** [is_suffix suf s] tests whether [suf] is a suffix of [s]. *)
+
   (** {6 Generic operations} **)
 
   module Set : Set.S with type elt = t