[Libguestfs] [PATCH 1/2] utils: import parse_size from libguestfs

[Pino Toscano]

---
 src/utils.ml  | 21 +++++++++++++++++++++
 src/utils.mli |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/src/utils.ml b/src/utils.ml
index 3e81c21..7ae24bd 100644
--- a/src/utils.ml
+++ b/src/utils.ml
@@ -204,3 +204,24 @@ let compare_architecture a1 a2 =
       exit 1
   in
   compare (index_of_architecture a1) (index_of_architecture a2)
+
+(* Parse a size field, eg. "10G". *)
+let parse_size =
+  let const_re = Str.regexp "^\\([.0-9]+\\)\\([bKMG]\\)$" in
+  fun field ->
+    let matches rex = Str.string_match rex field 0 in
+    let sub i = Str.matched_group i field in
+    let size_scaled f = function
+      | "b" -> Int64.of_float f
+      | "K" -> Int64.of_float (f *. 1024.)
+      | "M" -> Int64.of_float (f *. 1024. *. 1024.)
+      | "G" -> Int64.of_float (f *. 1024. *. 1024. *. 1024.)
+      | _ -> assert false
+    in
+
+    if matches const_re then (
+      size_scaled (float_of_string (sub 1)) (sub 2)
+    ) else (
+      eprintf "supermin: cannot parse size field '%s'\n" field;
+      exit 1
+    )
diff --git a/src/utils.mli b/src/utils.mli
index 5de940d..7896e34 100644
--- a/src/utils.mli
+++ b/src/utils.mli
@@ -90,3 +90,6 @@ val compare_version : string -> string -> int
 
 val compare_architecture : string -> string -> int
   (** Compare two architecture strings. *)
+
+val parse_size : string -> int64
+(** Parse a size field, eg. [10G] *)
-- 
2.1.0