grt-readline_none.adb: do not use getline(3)

Not available on windows.

1 files changed, 24 insertions, 19 deletions

diff --git a/src/grt/grt-readline_none.adb b/src/grt/grt-readline_none.adb
index cbcf35b19..4532e03b8 100644
--- a/src/grt/grt-readline_none.adb
+++ b/src/grt/grt-readline_none.adb
@@ -20,36 +20,41 @@
 --  covered by the GNU General Public License. This exception does not
 --  however invalidate any other reasons why the executable file might be
 --  covered by the GNU Public License.
-with System; use System;
 with Grt.C; use Grt.C;
 with Grt.Stdio; use Grt.Stdio;
 
 package body Grt.Readline_None is
-   function getline (Linep : Address; Linecapp : Address; Stream : FILEs)
-                    return ssize_t;
-   pragma Import (C, getline);
-
    function Readline (Prompt : Ghdl_C_String) return Ghdl_C_String
    is
-      Len : ssize_t;
       Linep : Ghdl_C_String;
-      Linecapp : size_t;
-      T : int;
+      Cap : size_t;
+      Len : Positive;
+      C : int;
    begin
-      T := fputs (To_Address (Prompt), stdout);
-      pragma Unreferenced (T);
+      C := fputs (To_Address (Prompt), stdout);
 
-      Linep := null;
-      Linecapp := 0;
-      Len := getline (Linep'Address, Linecapp'Address, stdin);
-      if Len <= 0 then
-         free (Linep);
+      --  Mimic getline(), which is not available on windows.
+      Cap := 64;
+      Linep := To_Ghdl_C_String (Malloc (Cap));
+      if Linep = null then
          return null;
       end if;
-      --  Remove end of line.
-      if Linep (Natural (Len)) = ASCII.LF then
-         Linep (Natural (Len)) := ASCII.NUL;
-      end if;
+
+      Len := 1;
+      loop
+         C := fgetc (stdin);
+         exit when C < 0 or C = Character'Pos (ASCII.LF);
+         Len := Len + 1;
+         if size_t (Len) = Cap then
+            Cap := Cap * 2;
+            Linep := To_Ghdl_C_String (Realloc (To_Address (Linep), Cap));
+            if Linep = null then
+               return null;
+            end if;
+         end if;
+         Linep (Len - 1) := Character'Val (C);
+      end loop;
+      Linep (Len) := ASCII.NUL;
       return Linep;
    end Readline;