From c2ca6b3881cd00f7023720816b671c85c46337e6 Mon Sep 17 00:00:00 2001
From: tradke <tradke@10716dce-81a3-4424-a2c8-48026a0d3035>
Date: Wed, 17 Nov 2004 16:44:22 +0000
Subject: Allow negative extents in a definition for a global hyperslab mapping
 as a shortcut for the maximum extent.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusPUGH/PUGHSlab/trunk@131 10716dce-81a3-4424-a2c8-48026a0d3035
---
 src/Mapping.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/src/Mapping.c b/src/Mapping.c
index 9bc0c33..548db56 100644
--- a/src/Mapping.c
+++ b/src/Mapping.c
@@ -144,6 +144,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
   cGroup vinfo;
   char key[128];
   CCTK_INT type, nelems, with_ghostzones;
+  CCTK_INT *real_extent;
 
 
   /* prevent compiler warnings */
@@ -232,7 +233,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
       retval |= origin[vdim] < 0;
       if (vdim < hdim)
       {
-        retval |= extent[vdim] < 0;
+        retval |= extent[vdim] == 0;
         if (downsample)
         {
           retval |= downsample[vdim] <= 0;
@@ -363,13 +364,20 @@ static CCTK_INT DefineMapping (const cGH      *GH,
   extras = GA->extras;
 
   /* check extent */
+  real_extent = malloc (vinfo.dim * sizeof (CCTK_INT));
   for (vdim = dim = 0; vdim < vinfo.dim; vdim++)
   {
+    real_extent[vdim] = extent[vdim];
+    if (real_extent[vdim] < 0)
+    {
+      real_extent[vdim] = extras->nsize[vdim];
+    }
     if (mapping->do_dir[vdim] && dim < mapping->hdim)
     {
-      if (origin[vdim] + extent[dim] > extras->nsize[vdim])
+      if (origin[vdim] + real_extent[dim] > extras->nsize[vdim])
       {
         free (mapping->do_dir); free (mapping->global_hsize); free (mapping);
+        free (real_extent);
         CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                     "PUGHlab_GlobalMappingByIndex: extent in "
                     "%d-direction exceeds grid size", dim);
@@ -378,9 +386,10 @@ static CCTK_INT DefineMapping (const cGH      *GH,
       dim++;
     }
     else if (mapping->is_diagonal_in_3D &&
-             origin[vdim] + extent[0] > extras->nsize[vdim])
+             origin[vdim] + real_extent[0] > extras->nsize[vdim])
     {
       free (mapping->do_dir); free (mapping->global_hsize); free (mapping);
+      free (real_extent);
       CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
                   "PUGHlab_GlobalMappingByIndex: extent in "
                   "%d-direction exceeds grid size", vdim);
@@ -400,7 +409,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
         mapping->downsample[vdim] = downsample[dim];
       }
       mapping->global_hsize[dim] =
-        (extent[dim] + mapping->downsample[vdim]-1) / mapping->downsample[vdim];
+        (real_extent[dim] + mapping->downsample[vdim]-1) / mapping->downsample[vdim];
 
       /* subtract ghostzones for periodic BC */
       if (! with_ghostzones && GA->connectivity->perme[vdim])
@@ -412,7 +421,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
     else if (mapping->is_diagonal_in_3D)
     {
       mapping->totals =
-        (extent[0] + mapping->downsample[0]-1) / mapping->downsample[0];
+        (real_extent[0] + mapping->downsample[0]-1) / mapping->downsample[0];
 
       /* subtract ghostzones for periodic BC */
       if (! with_ghostzones && GA->connectivity->perme[vdim])
@@ -427,7 +436,7 @@ static CCTK_INT DefineMapping (const cGH      *GH,
   }
 
   /* check whether the full local data patch was requested as hyperslab */
-  mapping->is_full_hyperslab = IsFullHyperslab (GA, origin, extent, mapping);
+  mapping->is_full_hyperslab = IsFullHyperslab (GA, origin, real_extent, mapping);
   if (mapping->is_full_hyperslab)
   {
     memset (mapping->local_startpoint, 0, vinfo.dim * sizeof (int));
@@ -468,8 +477,8 @@ static CCTK_INT DefineMapping (const cGH      *GH,
     /* compute the global endpoint */
     for (vdim = dim = 0; vdim < vinfo.dim; vdim++)
     {
-      mapping->global_endpoint[vdim] = origin[vdim] +
-                                   (mapping->do_dir[vdim] ? extent[dim++] : 1);
+      mapping->global_endpoint[vdim] =
+        origin[vdim] + (mapping->do_dir[vdim] ? real_extent[dim++] : 1);
     }
 
     /* compute this processor's global startpoint from the global ranges */
@@ -566,6 +575,8 @@ static CCTK_INT DefineMapping (const cGH      *GH,
     }
   } /* end of else branch for 'if (mapping->is_full_hyperslab)' */
 
+  free (real_extent);
+
 #ifdef DEBUG
   fprintf (stderr, "total number of hyperslab data points: %d\n",
            mapping->totals);
-- 
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