From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001
From: stainer_t <thomas.stainer@oecd-nea.org>
Date: Mon, 8 Sep 2025 13:48:49 +0200
Subject: Initial commit from Polytechnique Montreal

---
 Dragon/src/LIBIPS.f | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Dragon/src/LIBIPS.f

(limited to 'Dragon/src/LIBIPS.f')

diff --git a/Dragon/src/LIBIPS.f b/Dragon/src/LIBIPS.f
new file mode 100644
index 0000000..b56c375
--- /dev/null
+++ b/Dragon/src/LIBIPS.f
@@ -0,0 +1,64 @@
+*DECK LIBIPS
+      SUBROUTINE LIBIPS(IPLIB,NBISO,IPISO)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Construct the pointer array towards microlib isotopes.
+*
+*Copyright:
+* Copyright (C) 2017 Ecole Polytechnique de Montreal
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version
+*
+*Author(s): A. Hebert
+*
+*Parameters: input
+* IPLIB   pointer to the lattice microscopic cross section library
+*         (L_LIBRARY signature).
+* NBISO   number of isotopes present in the calculation domain.
+*
+*Parameters: output
+* IPISO   pointer array towards microlib isotopes.
+*
+*-----------------------------------------------------------------------
+*
+      USE GANLIB
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NBISO
+      TYPE(C_PTR) IPLIB,IPISO(NBISO)
+*----
+*  LOCAL VARIABLES
+*----
+      TYPE(C_PTR) JPLIB
+*----
+*  ALLOCATABLE ARRAYS
+*----
+      INTEGER, ALLOCATABLE, DIMENSION(:,:) :: ISONAM
+*
+      ALLOCATE(ISONAM(3,NBISO))
+      CALL LCMGET(IPLIB,'ISOTOPESUSED',ISONAM)
+      JPLIB=LCMGID(IPLIB,'ISOTOPESLIST')
+      DO 10 ISOT=1,NBISO
+      CALL LCMLEL(JPLIB,ISOT,LENGTH,ITYLCM)
+      IF(LENGTH.NE.0) THEN
+        IPISO(ISOT)=LCMGIL(JPLIB,ISOT) ! set ISOT-th isotope
+      ELSE
+        DO JSOT=1,ISOT-1
+          IF(ISONAM(1,ISOT).NE.ISONAM(1,JSOT)) CYCLE
+          IF(ISONAM(2,ISOT).NE.ISONAM(2,JSOT)) CYCLE
+          IF(ISONAM(3,ISOT).NE.ISONAM(3,JSOT)) CYCLE
+          IF(.NOT.C_ASSOCIATED(IPISO(JSOT))) CYCLE
+          IPISO(ISOT)=IPISO(JSOT) ! set JSOT-th isotope
+          GO TO 10
+        ENDDO
+        IPISO(ISOT)=C_NULL_PTR
+      ENDIF
+   10 CONTINUE
+      DEALLOCATE(ISONAM)
+      RETURN
+      END
-- 
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