From f473fc5cb8a6e100141088568533e9973ad5d95e Mon Sep 17 00:00:00 2001
From: Quincey Koziol <koziol@hdfgroup.org>
Date: Wed, 10 Dec 2003 13:34:53 -0500
Subject: [svn-r7926] Purpose:     Bug fix

Description:
    Clean up a few allocations of zero-sized blocks that were detected with
the new free-list assertions.

Platforms tested:
    FreeBSD 4.9 (sleipnir) w & w/o parallel
    too minor to require h5committest
---
 src/H5S.c       | 18 ++++++++++++++----
 src/H5Sselect.c | 27 ++++++++++++++++++---------
 2 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/src/H5S.c b/src/H5S.c
index 60af326..f599213 100644
--- a/src/H5S.c
+++ b/src/H5S.c
@@ -1200,8 +1200,12 @@ H5S_read(H5G_entry_t *ent, hid_t dxpl_id)
         HGOTO_ERROR (H5E_DATASPACE, H5E_CANTSET, NULL, "unable to set all selection");
 
     /* Allocate space for the offset and set it to zeros */
-    if (NULL==(ds->select.offset = H5FL_ARR_CALLOC(hssize_t,ds->extent.u.simple.rank)))
-        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
+    if(ds->extent.u.simple.rank>0) {
+        if (NULL==(ds->select.offset = H5FL_ARR_CALLOC(hssize_t,ds->extent.u.simple.rank)))
+            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
+    } /* end if */
+    else
+        ds->select.offset = NULL;
 
     /* Set the value for successful return */
     ret_value=ds;
@@ -1380,8 +1384,12 @@ H5S_set_extent_simple (H5S_t *space, unsigned rank, const hsize_t *dims,
         space->select.offset=H5FL_ARR_FREE(hssize_t,space->select.offset);
 
     /* Allocate space for the offset and set it to zeros */
-    if (NULL==(space->select.offset = H5FL_ARR_CALLOC(hssize_t,rank)))
-        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
+    if(rank>0) {
+        if (NULL==(space->select.offset = H5FL_ARR_CALLOC(hssize_t,rank)))
+            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
+    } /* end if */
+    else
+        space->select.offset = NULL;
 
     /* shift out of the previous state to a "simple" dataspace */
     switch (space->extent.type) {
@@ -1917,6 +1925,8 @@ H5Soffset_simple(hid_t space_id, const hssize_t *offset)
     /* Check args */
     if (NULL == (space = H5I_object_verify(space_id, H5I_DATASPACE)))
         HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "not a data space");
+    if (space->extent.u.simple.rank==0 || space->extent.type==H5S_SCALAR)
+        HGOTO_ERROR(H5E_ATOM, H5E_UNSUPPORTED, FAIL, "can't set offset on scalar dataspace");
     if (offset == NULL)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no offset specified");
 
diff --git a/src/H5Sselect.c b/src/H5Sselect.c
index 494c956..422e9ed 100644
--- a/src/H5Sselect.c
+++ b/src/H5Sselect.c
@@ -126,6 +126,7 @@ H5S_select_offset(H5S_t *space, const hssize_t *offset)
 
     /* Check args */
     assert(space);
+    assert(space->extent.u.simple.rank);
     assert(offset);
 
     /* Allocate space for new offset */
@@ -178,10 +179,14 @@ H5S_select_copy (H5S_t *dst, const H5S_t *src)
 /* Need to copy order information still */
 
     /* Copy offset information */
-    if (NULL==(dst->select.offset = H5FL_ARR_CALLOC(hssize_t,src->extent.u.simple.rank)))
-        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
-    if(src->select.offset!=NULL)
-        HDmemcpy(dst->select.offset,src->select.offset,(src->extent.u.simple.rank*sizeof(hssize_t)));
+    if(src->extent.u.simple.rank>0) {
+        if (NULL==(dst->select.offset = H5FL_ARR_CALLOC(hssize_t,src->extent.u.simple.rank)))
+            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
+        if(src->select.offset!=NULL)
+            HDmemcpy(dst->select.offset,src->select.offset,(src->extent.u.simple.rank*sizeof(hssize_t)));
+    } /* end if */
+    else
+        dst->select.offset=NULL;
 
     /* Perform correct type of copy based on the type of selection */
     switch (src->extent.type) {
@@ -596,12 +601,16 @@ H5S_select_iter_init(H5S_sel_iter_t *sel_iter, const H5S_t *space, size_t elmt_s
     /* Save the dataspace's rank */
     sel_iter->rank=space->extent.u.simple.rank;
 
-    /* Allocate room for the dataspace dimensions */
-    sel_iter->dims = H5FL_ARR_MALLOC(hsize_t,sel_iter->rank);
-    assert(sel_iter->dims);
+    if(sel_iter->rank>0) {
+        /* Allocate room for the dataspace dimensions */
+        sel_iter->dims = H5FL_ARR_MALLOC(hsize_t,sel_iter->rank);
+        assert(sel_iter->dims);
 
-    /* Keep a copy of the dataspace dimensions */
-    HDmemcpy(sel_iter->dims,space->extent.u.simple.size,sel_iter->rank*sizeof(hsize_t));
+        /* Keep a copy of the dataspace dimensions */
+        HDmemcpy(sel_iter->dims,space->extent.u.simple.size,sel_iter->rank*sizeof(hsize_t));
+    } /* end if */
+    else
+        sel_iter->dims = NULL;
 
     /* Call initialization routine for selection type */
     ret_value= (*space->select.iter_init)(sel_iter, space, elmt_size);
-- 
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