[svn-r23190] HDFFV-8285: Add suppress ddl option.

Tested: local linux

21 files changed, 516 insertions, 270 deletions

diff --git a/tools/h5dump/CMakeLists.txt b/tools/h5dump/CMakeLists.txt
index c446948..321b446 100644
--- a/tools/h5dump/CMakeLists.txt
+++ b/tools/h5dump/CMakeLists.txt
@@ -137,11 +137,12 @@ IF (BUILD_TESTING)
       #${HDF5_TOOLS_SRC_DIR}/testfiles/tqmarkfile.ddl
       #${HDF5_TOOLS_SRC_DIR}/testfiles/tstarfile.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tnamed_dtype_attr.ddl
-      ${HDF5_TOOLS_SRC_DIR}/testfiles/tnestcomp
-SET (HDF4_ENABLE_DEPRECATED_SYMBOLS ON CACHE BOOL "Enable deprecated public API symbols" FORCE)
-      -1.ddl
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/tnestcomp-1.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tnestedcmpddt.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tnbit.ddl
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/tnoattrdata.ddl
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/tnoattrddl.ddl
+      ${HDF5_TOOLS_SRC_DIR}/testfiles/tnodata.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tnoddl.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tnoddlfile.ddl
       ${HDF5_TOOLS_SRC_DIR}/testfiles/tno-subset.ddl
@@ -1141,6 +1142,12 @@ SET (HDF4_ENABLE_DEPRECATED_SYMBOLS ON CACHE BOOL "Enable deprecated public API
           tnestedcmpddt.out.err
           tnbit.out
           tnbit.out.err
+          tnoattrdata.out
+          tnoattrdata.out.err
+          tnoattrddl.out
+          tnoattrddl.out.err
+          tnodata.out
+          tnodata.out.err
           tnoddl.out
           tnoddl.out.err
           tnoddlfile.out
@@ -1255,30 +1262,33 @@ SET (HDF4_ENABLE_DEPRECATED_SYMBOLS ON CACHE BOOL "Enable deprecated public API
   ADD_HELP_TEST(help 0 -h)
 
   # test data output redirection
-#  ADD_H5_TEST (tnoddl 0 --enable-error-stack --ddl=NULL -y packedbits.h5)
-#  ADD_H5_TEST_EXPORT (trawdatafile packedbits.h5 0 --enable-error-stack -y -o)
-#  ADD_H5_TEST_EXPORT (tnoddlfile packedbits.h5 0 --enable-error-stack --ddl=NULL -y -o)
-#  ADD_TEST (
-#      NAME H5DUMP-clear-twithddlfile-export
-#      COMMAND    ${CMAKE_COMMAND}
-#          -E remove twithddl.txt
-#  )
-#  SET_TESTS_PROPERTIES (H5DUMP-clear-twithddlfile-export PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/std")
-#  IF (NOT "${last_test}" STREQUAL "")
-#    SET_TESTS_PROPERTIES (H5DUMP-clear-twithddlfile-export PROPERTIES DEPENDS ${last_test})
-#  ENDIF (NOT "${last_test}" STREQUAL "")
-#  SET (last_test "H5DUMP-clear-twithddlfile-export")
-#  ADD_H5_TEST_EXPORT (twithddlfile packedbits.h5 0 --enable-error-stack --ddl=twithddl.txt -y -o)
-#  ADD_TEST (
-#      NAME H5DUMP-output-cmp-meta-twithddlfile
-#      COMMAND ${CMAKE_COMMAND}
-#          -E compare_files twithddl.txt twithddl.ddl
-#  )
-#  SET_TESTS_PROPERTIES (H5DUMP-output-cmp-meta-twithddlfile PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/std")
-#  IF (NOT "${last_test}" STREQUAL "")
-#    SET_TESTS_PROPERTIES (H5DUMP-output-cmp-meta-twithddlfile PROPERTIES DEPENDS ${last_test})
-#  ENDIF (NOT "${last_test}" STREQUAL "")
-#  SET (last_test "H5DUMP-output-cmp-meta-twithddlfile")
+  ADD_H5_TEST (tnoddl 0 --enable-error-stack --ddl=NULL -y packedbits.h5)
+  ADD_H5_TEST (tnodata 0 --enable-error-stack --output=NULL packedbits.h5)
+  ADD_H5_TEST (tnoattrddl 0 --enable-error-stack --ddl=NULL -y tattr.h5)
+  ADD_H5_TEST (tnoattrdata 0 --enable-error-stack -A --output=NULL tattr.h5)
+  ADD_H5_TEST_EXPORT (trawdatafile packedbits.h5 0 --enable-error-stack -y -o)
+  ADD_H5_TEST_EXPORT (tnoddlfile packedbits.h5 0 --enable-error-stack --ddl=NULL -y -o)
+  ADD_TEST (
+      NAME H5DUMP-clear-twithddlfile-export
+      COMMAND    ${CMAKE_COMMAND}
+          -E remove twithddl.txt
+  )
+  SET_TESTS_PROPERTIES (H5DUMP-clear-twithddlfile-export PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/std")
+  IF (NOT "${last_test}" STREQUAL "")
+    SET_TESTS_PROPERTIES (H5DUMP-clear-twithddlfile-export PROPERTIES DEPENDS ${last_test})
+  ENDIF (NOT "${last_test}" STREQUAL "")
+  SET (last_test "H5DUMP-clear-twithddlfile-export")
+  ADD_H5_TEST_EXPORT (twithddlfile packedbits.h5 0 --enable-error-stack --ddl=twithddl.txt -y -o)
+  ADD_TEST (
+      NAME H5DUMP-output-cmp-meta-twithddlfile
+      COMMAND ${CMAKE_COMMAND}
+          -E compare_files twithddl.txt twithddl.ddl
+  )
+  SET_TESTS_PROPERTIES (H5DUMP-output-cmp-meta-twithddlfile PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles/std")
+  IF (NOT "${last_test}" STREQUAL "")
+    SET_TESTS_PROPERTIES (H5DUMP-output-cmp-meta-twithddlfile PROPERTIES DEPENDS ${last_test})
+  ENDIF (NOT "${last_test}" STREQUAL "")
+  SET (last_test "H5DUMP-output-cmp-meta-twithddlfile")
   
   # test for maximum display datasets
   ADD_H5_TEST (twidedisplay 0 --enable-error-stack -w0 packedbits.h5)
diff --git a/tools/h5dump/h5dump.c b/tools/h5dump/h5dump.c
index 34b8bc4..0d667df 100644
--- a/tools/h5dump/h5dump.c
+++ b/tools/h5dump/h5dump.c
@@ -71,7 +71,7 @@ struct handler_t {
  */
 /* The following initialization makes use of C language cancatenating */
 /* "xxx" "yyy" into "xxxyyy". */
-static const char *s_opts = "hn*peyBHirVa:c:d:f:g:k:l:t:w:xD:uX:o:b*F:s:S:Aq:z:m:RECM:";
+static const char *s_opts = "hn*peyBHirVa:c:d:f:g:k:l:t:w:xD:uX:o:b*F:s:S:Aq:z:m:RECM:O:";
 static struct long_options l_opts[] = {
     { "help", no_arg, 'h' },
     { "hel", no_arg, 'h' },
@@ -187,6 +187,7 @@ static struct long_options l_opts[] = {
     { "enable-error-stack", no_arg, 'E' },
     { "packed-bits", require_arg, 'M' },
     { "no-compact-subset", no_arg, 'C' },
+    { "ddl", require_arg, 'O' },
     { NULL, 0, '\0' }
 };
 
@@ -230,39 +231,39 @@ leave(int ret)
 static void
 usage(const char *prog)
 {
-    HDfflush(rawoutstream);
-    HDfprintf(rawoutstream, "usage: %s [OPTIONS] files\n", prog);
-    HDfprintf(rawoutstream, "  OPTIONS\n");
-    HDfprintf(rawoutstream, "     -h,   --help         Print a usage message and exit\n");
-    HDfprintf(rawoutstream, "     -n,   --contents     Print a list of the file contents and exit\n");
-    HDfprintf(rawoutstream, "                          Optional value 1 also prints attributes.\n");
-    HDfprintf(rawoutstream, "     -B,   --superblock   Print the content of the super block\n");
-    HDfprintf(rawoutstream, "     -H,   --header       Print the header only; no data is displayed\n");
-    HDfprintf(rawoutstream, "     -A,   --onlyattr     Print the header and value of attributes\n");
-    HDfprintf(rawoutstream, "     -i,   --object-ids   Print the object ids\n");
-    HDfprintf(rawoutstream, "     -r,   --string       Print 1-byte integer datasets as ASCII\n");
-    HDfprintf(rawoutstream, "     -e,   --escape       Escape non printing characters\n");
-    HDfprintf(rawoutstream, "     -V,   --version      Print version number and exit\n");
-    HDfprintf(rawoutstream, "     -a P, --attribute=P  Print the specified attribute\n");
-    HDfprintf(rawoutstream, "                          If an attribute name contains a slash (/), escape the\n");
-    HDfprintf(rawoutstream, "                          slash with a preceding backslash (\\).\n");
-    HDfprintf(rawoutstream, "                          (See example section below.)\n");
-    HDfprintf(rawoutstream, "     -d P, --dataset=P    Print the specified dataset\n");
-    HDfprintf(rawoutstream, "     -y,   --noindex      Do not print array indices with the data\n");
-    HDfprintf(rawoutstream, "     -p,   --properties   Print dataset filters, storage layout and fill value\n");
-    HDfprintf(rawoutstream, "     -f D, --filedriver=D Specify which driver to open the file with\n");
-    HDfprintf(rawoutstream, "     -g P, --group=P      Print the specified group and all members\n");
-    HDfprintf(rawoutstream, "     -l P, --soft-link=P  Print the value(s) of the specified soft link\n");
-    HDfprintf(rawoutstream, "     -o F, --output=F     Output raw data into file F\n");
-    HDfprintf(rawoutstream, "     -b B, --binary=B     Binary file output, of form B\n");
-    HDfprintf(rawoutstream, "     -t P, --datatype=P   Print the specified named datatype\n");
-    HDfprintf(rawoutstream, "     -w N, --width=N      Set the number of columns of output. A value of 0 (zero)\n");
-    HDfprintf(rawoutstream, "                          sets the number of columns to the maximum (65535).\n");
-    HDfprintf(rawoutstream, "                          Default width is 80 columns.\n");
-    HDfprintf(rawoutstream, "     -m T, --format=T     Set the floating point output format\n");
-    HDfprintf(rawoutstream, "     -q Q, --sort_by=Q    Sort groups and attributes by index Q\n");
-    HDfprintf(rawoutstream, "     -z Z, --sort_order=Z Sort groups and attributes by order Z\n");
-    HDfprintf(rawoutstream,
+    FLUSHSTREAM(rawoutstream);
+    PRINTSTREAM(rawoutstream, "usage: %s [OPTIONS] files\n", prog);
+    PRINTVALSTREAM(rawoutstream, "  OPTIONS\n");
+    PRINTVALSTREAM(rawoutstream, "     -h,   --help         Print a usage message and exit\n");
+    PRINTVALSTREAM(rawoutstream, "     -n,   --contents     Print a list of the file contents and exit\n");
+    PRINTVALSTREAM(rawoutstream, "                          Optional value 1 also prints attributes.\n");
+    PRINTVALSTREAM(rawoutstream, "     -B,   --superblock   Print the content of the super block\n");
+    PRINTVALSTREAM(rawoutstream, "     -H,   --header       Print the header only; no data is displayed\n");
+    PRINTVALSTREAM(rawoutstream, "     -A,   --onlyattr     Print the header and value of attributes\n");
+    PRINTVALSTREAM(rawoutstream, "     -i,   --object-ids   Print the object ids\n");
+    PRINTVALSTREAM(rawoutstream, "     -r,   --string       Print 1-byte integer datasets as ASCII\n");
+    PRINTVALSTREAM(rawoutstream, "     -e,   --escape       Escape non printing characters\n");
+    PRINTVALSTREAM(rawoutstream, "     -V,   --version      Print version number and exit\n");
+    PRINTVALSTREAM(rawoutstream, "     -a P, --attribute=P  Print the specified attribute\n");
+    PRINTVALSTREAM(rawoutstream, "                          If an attribute name contains a slash (/), escape the\n");
+    PRINTVALSTREAM(rawoutstream, "                          slash with a preceding backslash (\\).\n");
+    PRINTVALSTREAM(rawoutstream, "                          (See example section below.)\n");
+    PRINTVALSTREAM(rawoutstream, "     -d P, --dataset=P    Print the specified dataset\n");
+    PRINTVALSTREAM(rawoutstream, "     -y,   --noindex      Do not print array indices with the data\n");
+    PRINTVALSTREAM(rawoutstream, "     -p,   --properties   Print dataset filters, storage layout and fill value\n");
+    PRINTVALSTREAM(rawoutstream, "     -f D, --filedriver=D Specify which driver to open the file with\n");
+    PRINTVALSTREAM(rawoutstream, "     -g P, --group=P      Print the specified group and all members\n");
+    PRINTVALSTREAM(rawoutstream, "     -l P, --soft-link=P  Print the value(s) of the specified soft link\n");
+    PRINTVALSTREAM(rawoutstream, "     -o F, --output=F     Output raw data into file F\n");
+    PRINTVALSTREAM(rawoutstream, "     -b B, --binary=B     Binary file output, of form B\n");
+    PRINTVALSTREAM(rawoutstream, "     -t P, --datatype=P   Print the specified named datatype\n");
+    PRINTVALSTREAM(rawoutstream, "     -w N, --width=N      Set the number of columns of output. A value of 0 (zero)\n");
+    PRINTVALSTREAM(rawoutstream, "                          sets the number of columns to the maximum (65535).\n");
+    PRINTVALSTREAM(rawoutstream, "                          Default width is 80 columns.\n");
+    PRINTVALSTREAM(rawoutstream, "     -m T, --format=T     Set the floating point output format\n");
+    PRINTVALSTREAM(rawoutstream, "     -q Q, --sort_by=Q    Sort groups and attributes by index Q\n");
+    PRINTVALSTREAM(rawoutstream, "     -z Z, --sort_order=Z Sort groups and attributes by order Z\n");
+    PRINTVALSTREAM(rawoutstream,
   "     -M L, --packedbits=L Print packed bits as unsigned integers, using mask\n"
   "                          format L for an integer dataset specified with\n"
   "                          option -d. L is a list of offset,length values,\n"
@@ -270,92 +271,94 @@ usage(const char *prog)
   "                          the data value and length is the number of bits of\n"
   "                          the mask.\n"
   );
-    HDfprintf(rawoutstream, "     -R,   --region       Print dataset pointed by region references\n");
-    HDfprintf(rawoutstream, "     -x,   --xml          Output in XML using Schema\n");
-    HDfprintf(rawoutstream, "     -u,   --use-dtd      Output in XML using DTD\n");
-    HDfprintf(rawoutstream, "     -D U, --xml-dtd=U    Use the DTD or schema at U\n");
-    HDfprintf(rawoutstream, "     -X S, --xml-ns=S     (XML Schema) Use qualified names n the XML\n");
-    HDfprintf(rawoutstream, "                          \":\": no namespace, default: \"hdf5:\"\n");
-    HDfprintf(rawoutstream, "                          E.g., to dump a file called `-f', use h5dump -- -f\n");
-    HDfprintf(rawoutstream, "     --enable-error-stack Prints messages from the HDF5 error stack as they\n");
-    HDfprintf(rawoutstream, "                          occur.\n");
-    HDfprintf(rawoutstream, "     --no-compact-subset  Disable compact form of subsetting and allow the use\n");
-    HDfprintf(rawoutstream, "                          of \"[\" in dataset names.\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, " Subsetting is available by using the following options with a dataset\n");
-    HDfprintf(rawoutstream, " attribute. Subsetting is done by selecting a hyperslab from the data.\n");
-    HDfprintf(rawoutstream, " Thus, the options mirror those for performing a hyperslab selection.\n");
-    HDfprintf(rawoutstream, " One of the START, COUNT, STRIDE, or BLOCK parameters are mandatory if you do subsetting.\n");
-    HDfprintf(rawoutstream, " The STRIDE, COUNT, and BLOCK parameters are optional and will default to 1 in\n");
-    HDfprintf(rawoutstream, " each dimension. START is optional and will default to 0 in each dimension.\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      -s START,  --start=START    Offset of start of subsetting selection\n");
-    HDfprintf(rawoutstream, "      -S STRIDE, --stride=STRIDE  Hyperslab stride\n");
-    HDfprintf(rawoutstream, "      -c COUNT,  --count=COUNT    Number of blocks to include in selection\n");
-    HDfprintf(rawoutstream, "      -k BLOCK,  --block=BLOCK    Size of block in hyperslab\n");
-    HDfprintf(rawoutstream, "  START, COUNT, STRIDE, and BLOCK - is a list of integers the number of which are equal to the\n");
-    HDfprintf(rawoutstream, "      number of dimensions in the dataspace being queried\n");
-    HDfprintf(rawoutstream, "      (Alternate compact form of subsetting is described in the Reference Manual)\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  D - is the file driver to use in opening the file. Acceptable values\n");
-    HDfprintf(rawoutstream, "      are \"sec2\", \"family\", \"split\", \"multi\", \"direct\", and \"stream\". Without\n");
-    HDfprintf(rawoutstream, "      the file driver flag, the file will be opened with each driver in\n");
-    HDfprintf(rawoutstream, "      turn and in the order specified above until one driver succeeds\n");
-    HDfprintf(rawoutstream, "      in opening the file.\n");
-    HDfprintf(rawoutstream, "      These are the letters that are appended to the file name(without .h5) when opening\n");
-    HDfprintf(rawoutstream, "      names for the split(m,r) and multi(s,b,r,g,l,o) drivers. They are:\n");
-    HDfprintf(rawoutstream, "         m: All meta data when using the split driver.\n");
-    HDfprintf(rawoutstream, "         s: The userblock, superblock, and driver info block\n");
-    HDfprintf(rawoutstream, "         b: B-tree nodes\n");
-    HDfprintf(rawoutstream, "         r: Dataset raw data\n");
-    HDfprintf(rawoutstream, "         g: Global heap\n");
-    HDfprintf(rawoutstream, "         l: local heap (object names)\n");
-    HDfprintf(rawoutstream, "         o: object headers\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  F - is a filename.\n");
-    HDfprintf(rawoutstream, "  P - is the full path from the root group to the object.\n");
-    HDfprintf(rawoutstream, "  N - is an integer greater than 1.\n");
-    HDfprintf(rawoutstream, "  T - is a string containing the floating point format, e.g '%%.3f'\n");
-    HDfprintf(rawoutstream, "  U - is a URI reference (as defined in [IETF RFC 2396],\n");
-    HDfprintf(rawoutstream, "        updated by [IETF RFC 2732])\n");
-    HDfprintf(rawoutstream, "  B - is the form of binary output: NATIVE for a memory type, FILE for the\n");
-    HDfprintf(rawoutstream, "        file type, LE or BE for pre-existing little or big endian types.\n");
-    HDfprintf(rawoutstream, "        Must be used with -o (output file) and it is recommended that\n");
-    HDfprintf(rawoutstream, "        -d (dataset) is used. B is an optional argument, defaults to NATIVE\n");
-    HDfprintf(rawoutstream, "  Q - is the sort index type. It can be \"creation_order\" or \"name\" (default)\n");
-    HDfprintf(rawoutstream, "  Z - is the sort order type. It can be \"descending\" or \"ascending\" (default)\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  Examples:\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  1) Attribute foo of the group /bar_none in file quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -a /bar_none/foo quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "     Attribute \"high/low\" of the group /bar_none in the file quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -a \"/bar_none/high\\/low\" quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  2) Selecting a subset from dataset /foo in file quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -d /foo -s \"0,1\" -S \"1,1\" -c \"2,3\" -k \"2,2\" quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  3) Saving dataset 'dset' in file quux.h5 to binary file 'out.bin'\n");
-    HDfprintf(rawoutstream, "        using a little-endian type\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -d /dset -b LE -o out.bin quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  4) Display two packed bits (bits 0-1 and bits 4-6) in the dataset /dset\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -d /dset -M 0,1,4,3 quux.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  5) Dataset foo in files file1.h5 file2.h5 file3.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -d /foo file1.h5 file2.h5 file3.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "  6) Dataset foo in split files splitfile-m.h5 splitfile-r.h5\n");
-    HDfprintf(rawoutstream, "\n");
-    HDfprintf(rawoutstream, "      h5dump -d /foo -f split splitfile\n");
-    HDfprintf(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "     -R,   --region       Print dataset pointed by region references\n");
+    PRINTVALSTREAM(rawoutstream, "     -x,   --xml          Output in XML using Schema\n");
+    PRINTVALSTREAM(rawoutstream, "     -u,   --use-dtd      Output in XML using DTD\n");
+    PRINTVALSTREAM(rawoutstream, "     -D U, --xml-dtd=U    Use the DTD or schema at U\n");
+    PRINTVALSTREAM(rawoutstream, "     -X S, --xml-ns=S     (XML Schema) Use qualified names n the XML\n");
+    PRINTVALSTREAM(rawoutstream, "                          \":\": no namespace, default: \"hdf5:\"\n");
+    PRINTVALSTREAM(rawoutstream, "                          E.g., to dump a file called `-f', use h5dump -- -f\n");
+    PRINTVALSTREAM(rawoutstream, "     --enable-error-stack Prints messages from the HDF5 error stack as they\n");
+    PRINTVALSTREAM(rawoutstream, "                          occur.\n");
+    PRINTVALSTREAM(rawoutstream, "     --no-compact-subset  Disable compact form of subsetting and allow the use\n");
+    PRINTVALSTREAM(rawoutstream, "                          of \"[\" in dataset names.\n");
+    PRINTVALSTREAM(rawoutstream, "     -O F, --ddl=F        Output ddl text into file F\n");
+    PRINTVALSTREAM(rawoutstream, "                          Use NULL as filename to suppress ddl display\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, " Subsetting is available by using the following options with a dataset\n");
+    PRINTVALSTREAM(rawoutstream, " attribute. Subsetting is done by selecting a hyperslab from the data.\n");
+    PRINTVALSTREAM(rawoutstream, " Thus, the options mirror those for performing a hyperslab selection.\n");
+    PRINTVALSTREAM(rawoutstream, " One of the START, COUNT, STRIDE, or BLOCK parameters are mandatory if you do subsetting.\n");
+    PRINTVALSTREAM(rawoutstream, " The STRIDE, COUNT, and BLOCK parameters are optional and will default to 1 in\n");
+    PRINTVALSTREAM(rawoutstream, " each dimension. START is optional and will default to 0 in each dimension.\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      -s START,  --start=START    Offset of start of subsetting selection\n");
+    PRINTVALSTREAM(rawoutstream, "      -S STRIDE, --stride=STRIDE  Hyperslab stride\n");
+    PRINTVALSTREAM(rawoutstream, "      -c COUNT,  --count=COUNT    Number of blocks to include in selection\n");
+    PRINTVALSTREAM(rawoutstream, "      -k BLOCK,  --block=BLOCK    Size of block in hyperslab\n");
+    PRINTVALSTREAM(rawoutstream, "  START, COUNT, STRIDE, and BLOCK - is a list of integers the number of which are equal to the\n");
+    PRINTVALSTREAM(rawoutstream, "      number of dimensions in the dataspace being queried\n");
+    PRINTVALSTREAM(rawoutstream, "      (Alternate compact form of subsetting is described in the Reference Manual)\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  D - is the file driver to use in opening the file. Acceptable values\n");
+    PRINTVALSTREAM(rawoutstream, "      are \"sec2\", \"family\", \"split\", \"multi\", \"direct\", and \"stream\". Without\n");
+    PRINTVALSTREAM(rawoutstream, "      the file driver flag, the file will be opened with each driver in\n");
+    PRINTVALSTREAM(rawoutstream, "      turn and in the order specified above until one driver succeeds\n");
+    PRINTVALSTREAM(rawoutstream, "      in opening the file.\n");
+    PRINTVALSTREAM(rawoutstream, "      These are the letters that are appended to the file name(without .h5) when opening\n");
+    PRINTVALSTREAM(rawoutstream, "      names for the split(m,r) and multi(s,b,r,g,l,o) drivers. They are:\n");
+    PRINTVALSTREAM(rawoutstream, "         m: All meta data when using the split driver.\n");
+    PRINTVALSTREAM(rawoutstream, "         s: The userblock, superblock, and driver info block\n");
+    PRINTVALSTREAM(rawoutstream, "         b: B-tree nodes\n");
+    PRINTVALSTREAM(rawoutstream, "         r: Dataset raw data\n");
+    PRINTVALSTREAM(rawoutstream, "         g: Global heap\n");
+    PRINTVALSTREAM(rawoutstream, "         l: local heap (object names)\n");
+    PRINTVALSTREAM(rawoutstream, "         o: object headers\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  F - is a filename.\n");
+    PRINTVALSTREAM(rawoutstream, "  P - is the full path from the root group to the object.\n");
+    PRINTVALSTREAM(rawoutstream, "  N - is an integer greater than 1.\n");
+    PRINTVALSTREAM(rawoutstream, "  T - is a string containing the floating point format, e.g '%%.3f'\n");
+    PRINTVALSTREAM(rawoutstream, "  U - is a URI reference (as defined in [IETF RFC 2396],\n");
+    PRINTVALSTREAM(rawoutstream, "        updated by [IETF RFC 2732])\n");
+    PRINTVALSTREAM(rawoutstream, "  B - is the form of binary output: NATIVE for a memory type, FILE for the\n");
+    PRINTVALSTREAM(rawoutstream, "        file type, LE or BE for pre-existing little or big endian types.\n");
+    PRINTVALSTREAM(rawoutstream, "        Must be used with -o (output file) and it is recommended that\n");
+    PRINTVALSTREAM(rawoutstream, "        -d (dataset) is used. B is an optional argument, defaults to NATIVE\n");
+    PRINTVALSTREAM(rawoutstream, "  Q - is the sort index type. It can be \"creation_order\" or \"name\" (default)\n");
+    PRINTVALSTREAM(rawoutstream, "  Z - is the sort order type. It can be \"descending\" or \"ascending\" (default)\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  Examples:\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  1) Attribute foo of the group /bar_none in file quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -a /bar_none/foo quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "     Attribute \"high/low\" of the group /bar_none in the file quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -a \"/bar_none/high\\/low\" quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  2) Selecting a subset from dataset /foo in file quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -d /foo -s \"0,1\" -S \"1,1\" -c \"2,3\" -k \"2,2\" quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  3) Saving dataset 'dset' in file quux.h5 to binary file 'out.bin'\n");
+    PRINTVALSTREAM(rawoutstream, "        using a little-endian type\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -d /dset -b LE -o out.bin quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  4) Display two packed bits (bits 0-1 and bits 4-6) in the dataset /dset\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -d /dset -M 0,1,4,3 quux.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  5) Dataset foo in files file1.h5 file2.h5 file3.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -d /foo file1.h5 file2.h5 file3.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "  6) Dataset foo in split files splitfile-m.h5 splitfile-r.h5\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "      h5dump -d /foo -f split splitfile\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
 }
 
 
@@ -500,6 +503,7 @@ table_list_free(void)
 static int
 set_data_output_file(const char *fname, int is_bin)
 {
+    int     retvalue = FAIL;
     FILE    *f;    /* temporary holding place for the stream pointer
                     * so that rawdatastream is changed only when succeeded */
 
@@ -510,21 +514,68 @@ set_data_output_file(const char *fname, int is_bin)
             rawdatastream = NULL;
     }
 
-    /* binary output */
-    if (is_bin) {
-        if ((f = HDfopen(fname, "wb")) != NULL) {
-            rawdatastream = f;
-            return 0;
+    /* First check if filename is string "NULL" */
+    if (HDstrcmp(fname, "NULL") == 0) {
+        rawdatastream = NULL;
+        retvalue = SUCCEED;
+    }
+    else {
+        /* binary output */
+        if (is_bin) {
+            if ((f = HDfopen(fname, "wb")) != NULL) {
+                rawdatastream = f;
+                retvalue = SUCCEED;
+            }
+        }
+        else {
+            if ((f = HDfopen(fname, "w")) != NULL) {
+                rawdatastream = f;
+                retvalue = SUCCEED;
+            }
         }
     }
+
+    return retvalue;
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    set_attr_output_file
+ *
+ * Purpose:     Open fname as the output file for attribute raw data.
+ *      Set rawattrstream as its file stream.
+ *
+ * Return:      0 -- succeeded
+ *      negative -- failed
+ *
+ *-------------------------------------------------------------------------
+ */
+static int
+set_attr_output_file(const char *fname, int is_bin)
+{
+    int     retvalue = FAIL;
+    FILE    *f;    /* temporary holding place for the stream pointer
+                    * so that rawattrstream is changed only when succeeded */
+
+    if (rawattrstream && rawattrstream != stdout) {
+        if (HDfclose(rawattrstream))
+            HDperror("closing rawattrstream");
+        else
+            rawattrstream = NULL;
+    }
+
+    /* First check if filename is string "NULL" */
+    if (HDstrcmp(fname, "NULL") == 0) {
+        rawattrstream = NULL;
+        retvalue = SUCCEED;
+    }
     else {
         if ((f = HDfopen(fname, "w")) != NULL) {
-            rawdatastream = f;
-            return 0;
+            rawattrstream = f;
+            retvalue = SUCCEED;
         }
     }
 
-    return -1;
+    return retvalue;
 }
 
 /*-------------------------------------------------------------------------
@@ -541,6 +592,7 @@ set_data_output_file(const char *fname, int is_bin)
 static int
 set_output_file(const char *fname)
 {
+    int     retvalue = FAIL;
     FILE    *f;    /* temporary holding place for the stream pointer
                     * so that rawoutstream is changed only when succeeded */
 
@@ -550,13 +602,17 @@ set_output_file(const char *fname)
         else
             rawoutstream = NULL;
     }
-
-    if ((f = HDfopen(fname, "w")) != NULL) {
+    /* First check if filename is string "NULL" */
+    if (HDstrcmp(fname, "NULL") == 0) {
+        rawoutstream = NULL;
+        retvalue = SUCCEED;
+    }
+    else if ((f = HDfopen(fname, "w")) != NULL) {
         rawoutstream = f;
-        return 0;
+        retvalue = SUCCEED;
     }
 
-    return -1;
+    return retvalue;
 }
 
 /*-------------------------------------------------------------------------
@@ -573,6 +629,7 @@ set_output_file(const char *fname)
 static int
 set_error_file(const char *fname)
 {
+    int     retvalue = FAIL;
     FILE    *f;    /* temporary holding place for the stream pointer
                     * so that rawerrorstream is changed only when succeeded */
 
@@ -585,10 +642,10 @@ set_error_file(const char *fname)
 
     if ((f = HDfopen(fname, "w")) != NULL) {
         rawerrorstream = f;
-        return 0;
+        retvalue = SUCCEED;
     }
 
-    return -1;
+    return retvalue;
 }
 
 /*-------------------------------------------------------------------------
@@ -1125,6 +1182,13 @@ parse_start:
             last_was_dset = FALSE;
             break;
 
+        case 'O':
+            if (set_output_file(opt_arg) < 0) {
+                usage(h5tools_getprogname());
+                goto error;
+            }
+            break;
+
         case 'o':
             if ( bin_output ) {
                 if (set_data_output_file(opt_arg, 1) < 0) {
@@ -1133,9 +1197,17 @@ parse_start:
                 }
             }
             else {
-                if (set_data_output_file(opt_arg, 0) < 0) {
-                    usage(h5tools_getprogname());
-                    goto error;
+                if(display_attr_data && !display_data) {
+                    if (set_attr_output_file(opt_arg, 0) < 0) {
+                        usage(h5tools_getprogname());
+                        goto error;
+                    }
+                }
+                if(display_data || display_all) {
+                    if (set_data_output_file(opt_arg, 0) < 0) {
+                        usage(h5tools_getprogname());
+                        goto error;
+                    }
                 }
             }
 
@@ -1558,12 +1630,12 @@ main(int argc, const char *argv[])
             begin_obj(h5tools_dump_header_format->filebegin, fname, h5tools_dump_header_format->fileblockbegin);
         } 
         else {
-            HDfprintf(rawoutstream, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
+            PRINTVALSTREAM(rawoutstream, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
 
             /* alternative first element, depending on schema or DTD. */
             if (useschema) {
                 if (HDstrcmp(xmlnsprefix,"") == 0) {
-                    HDfprintf(rawoutstream, "<HDF5-File xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"%s\">\n",
+                    PRINTSTREAM(rawoutstream, "<HDF5-File xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"%s\">\n",
                             xml_dtd_uri);
                 } 
                 else {
@@ -1575,7 +1647,7 @@ main(int argc, const char *argv[])
                     indx = HDstrrchr(ns,(int)':');
                     if (indx) *indx = '\0';
 
-                    HDfprintf(rawoutstream, "<%sHDF5-File xmlns:%s=\"http://hdfgroup.org/HDF5/XML/schema/HDF5-File\" "
+                    PRINTSTREAM(rawoutstream, "<%sHDF5-File xmlns:%s=\"http://hdfgroup.org/HDF5/XML/schema/HDF5-File\" "
                             "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
                             "xsi:schemaLocation=\"http://hdfgroup.org/HDF5/XML/schema/HDF5-File "
                             "http://www.hdfgroup.org/HDF5/XML/schema/HDF5-File.xsd\">\n",xmlnsprefix,ns);
@@ -1583,17 +1655,17 @@ main(int argc, const char *argv[])
                 }
             } 
             else {
-                HDfprintf(rawoutstream, "<!DOCTYPE HDF5-File PUBLIC \"HDF5-File.dtd\" \"%s\">\n", xml_dtd_uri);
-                HDfprintf(rawoutstream, "<HDF5-File>\n");
+                PRINTSTREAM(rawoutstream, "<!DOCTYPE HDF5-File PUBLIC \"HDF5-File.dtd\" \"%s\">\n", xml_dtd_uri);
+                PRINTVALSTREAM(rawoutstream, "<HDF5-File>\n");
             }
         }
 
         if (!doxml) {
             if (display_fi) {
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 dump_fcontents(fid);
                 end_obj(h5tools_dump_header_format->fileend,h5tools_dump_header_format->fileblockend);
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 goto done;
             }
 
@@ -1612,7 +1684,7 @@ main(int argc, const char *argv[])
                 dump_function_table->dump_group_function(gid, "/" );
                 if (!doxml)
                     dump_indent -= COL;
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
             }
 
             if(H5Gclose(gid) < 0) {
@@ -1634,15 +1706,15 @@ main(int argc, const char *argv[])
                     hand[i].func(fid, hand[i].obj, hand[i].subset_info, 1, NULL);
                 }
             }
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
         }
 
         if (!doxml) {
             end_obj(h5tools_dump_header_format->fileend, h5tools_dump_header_format->fileblockend);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
         } 
         else {
-            HDfprintf(rawoutstream, "</%sHDF5-File>\n", xmlnsprefix);
+            PRINTSTREAM(rawoutstream, "</%sHDF5-File>\n", xmlnsprefix);
         }
         /* Free tables for objects */
         table_list_free();
diff --git a/tools/h5dump/h5dump_ddl.c b/tools/h5dump/h5dump_ddl.c
index 6f5fd3f..c4a9ecb 100644
--- a/tools/h5dump/h5dump_ddl.c
+++ b/tools/h5dump/h5dump_ddl.c
@@ -1168,23 +1168,23 @@ dump_fcpl(hid_t fid)
     * SUPER_BLOCK
     *-------------------------------------------------------------------------
     */
-    HDfprintf(rawoutstream, "\n%s %s\n",SUPER_BLOCK, BEGIN);
+    PRINTSTREAM(rawoutstream, "\n%s %s\n",SUPER_BLOCK, BEGIN);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","SUPERBLOCK_VERSION", finfo.super.version);
+    PRINTSTREAM(rawoutstream, "%s %u\n","SUPERBLOCK_VERSION", finfo.super.version);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","FREELIST_VERSION", finfo.free.version);
+    PRINTSTREAM(rawoutstream, "%s %u\n","FREELIST_VERSION", finfo.free.version);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","SYMBOLTABLE_VERSION", 0);  /* Retain this for backward compatibility, for now (QAK) */
+    PRINTSTREAM(rawoutstream, "%s %u\n","SYMBOLTABLE_VERSION", 0);  /* Retain this for backward compatibility, for now (QAK) */
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","OBJECTHEADER_VERSION", finfo.sohm.version);
+    PRINTSTREAM(rawoutstream, "%s %u\n","OBJECTHEADER_VERSION", finfo.sohm.version);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream,"%s %Hd\n","OFFSET_SIZE", (long long)off_size);
+    PRINTSTREAM(rawoutstream,"%s %Hd\n","OFFSET_SIZE", (long long)off_size);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream,"%s %Hd\n","LENGTH_SIZE", (long long)len_size);
+    PRINTSTREAM(rawoutstream,"%s %Hd\n","LENGTH_SIZE", (long long)len_size);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","BTREE_RANK", sym_ik);
+    PRINTSTREAM(rawoutstream, "%s %u\n","BTREE_RANK", sym_ik);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %d\n","BTREE_LEAF", sym_lk);
+    PRINTSTREAM(rawoutstream, "%s %d\n","BTREE_LEAF", sym_lk);
 
 #ifdef SHOW_FILE_DRIVER
     if (H5FD_CORE==fdriver)
@@ -1215,37 +1215,42 @@ dump_fcpl(hid_t fid)
     /* Take out this because the driver used can be different from the
      * standard output. */
     /*indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %s\n","FILE_DRIVER", dname);*/
+    PRINTSTREAM(rawoutstream, "%s %s\n","FILE_DRIVER", dname);*/
 #endif
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %u\n","ISTORE_K", istore_ik);
+    PRINTSTREAM(rawoutstream, "%s %u\n","ISTORE_K", istore_ik);
 
     indentation(dump_indent + COL);
-    if(fs_strategy == H5F_FILE_SPACE_ALL_PERSIST)
-        HDfprintf(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_ALL_PERSIST");
-    else if(fs_strategy == H5F_FILE_SPACE_ALL)
-        HDfprintf(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_ALL");
-    else if(fs_strategy == H5F_FILE_SPACE_AGGR_VFD)
-        HDfprintf(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_AGGR_VFD");
-    else if(fs_strategy == H5F_FILE_SPACE_VFD)
-        HDfprintf(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_VFD");
-    else
-        HDfprintf(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "Unknown strategy");
+    if(fs_strategy == H5F_FILE_SPACE_ALL_PERSIST) {
+        PRINTSTREAM(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_ALL_PERSIST");
+    }
+    else if(fs_strategy == H5F_FILE_SPACE_ALL) {
+        PRINTSTREAM(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_ALL");
+    }
+    else if(fs_strategy == H5F_FILE_SPACE_AGGR_VFD) {
+        PRINTSTREAM(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_AGGR_VFD");
+    }
+    else if(fs_strategy == H5F_FILE_SPACE_VFD) {
+        PRINTSTREAM(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "H5F_FILE_SPACE_VFD");
+    }
+    else {
+        PRINTSTREAM(rawoutstream, "%s %s\n", "FILE_SPACE_STRATEGY", "Unknown strategy");
+    }
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s %Hu\n","FREE_SPACE_THRESHOLD", fs_threshold);
+    PRINTSTREAM(rawoutstream, "%s %Hu\n","FREE_SPACE_THRESHOLD", fs_threshold);
 
     /*-------------------------------------------------------------------------
     * USER_BLOCK
     *-------------------------------------------------------------------------
     */
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "USER_BLOCK %s\n",BEGIN);
+    PRINTSTREAM(rawoutstream, "USER_BLOCK %s\n",BEGIN);
     indentation(dump_indent + COL + COL);
-    HDfprintf(rawoutstream,"%s %Hu\n","USERBLOCK_SIZE", userblock);
+    PRINTSTREAM(rawoutstream,"%s %Hu\n","USERBLOCK_SIZE", userblock);
     indentation(dump_indent + COL);
-    HDfprintf(rawoutstream, "%s\n",END);
+    PRINTSTREAM(rawoutstream, "%s\n",END);
 
-    HDfprintf(rawoutstream, "%s",END);
+    PRINTSTREAM(rawoutstream, "%s",END);
 }
 
 /*-------------------------------------------------------------------------
@@ -1264,7 +1269,7 @@ dump_fcpl(hid_t fid)
 void
 dump_fcontents(hid_t fid)
 {
-    HDfprintf(rawoutstream, "%s %s\n",FILE_CONTENTS, BEGIN);
+    PRINTSTREAM(rawoutstream, "%s %s\n",FILE_CONTENTS, BEGIN);
 
     /* special case of unamed types in root group */
     if (unamedtype) {
@@ -1272,14 +1277,14 @@ dump_fcontents(hid_t fid)
 
         for (u = 0; u < type_table->nobjs; u++) {
             if (!type_table->objs[u].recorded)
-                HDfprintf(rawoutstream, " %-10s /#"H5_PRINTF_HADDR_FMT"\n", "datatype", type_table->objs[u].objno);
+                PRINTSTREAM(rawoutstream, " %-10s /#"H5_PRINTF_HADDR_FMT"\n", "datatype", type_table->objs[u].objno);
         }
     }
 
     /* print objects in the files */
     h5trav_print(fid);
 
-    HDfprintf(rawoutstream, " %s\n",END);
+    PRINTSTREAM(rawoutstream, " %s\n",END);
 }
 
 /*-------------------------------------------------------------------------
@@ -1564,12 +1569,12 @@ handle_datasets(hid_t fid, const char *dset, void *data, int pe, const char *dis
 
         if(found_obj) {
             if (found_obj->displayed) {
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 indentation(dump_indent);
                 begin_obj(h5tools_dump_header_format->datasetbegin, real_name, h5tools_dump_header_format->datasetblockbegin);
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 indentation(dump_indent + COL);
-                HDfprintf(rawoutstream, "%s \"%s\"\n", HARDLINK, found_obj->objname);
+                PRINTSTREAM(rawoutstream, "%s \"%s\"\n", HARDLINK, found_obj->objname);
                 indentation(dump_indent);
                 end_obj(h5tools_dump_header_format->datasetend, h5tools_dump_header_format->datasetblockend);
             } 
@@ -1621,9 +1626,9 @@ handle_groups(hid_t fid, const char *group, void UNUSED *data, int pe, const cha
 
     if((gid = H5Gopen2(fid, group, H5P_DEFAULT)) < 0) {
         if (pe) {
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             begin_obj(h5tools_dump_header_format->groupbegin, real_name, h5tools_dump_header_format->groupblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             indentation(COL);
             error_msg("unable to open group \"%s\"\n", real_name);
             end_obj(h5tools_dump_header_format->groupend, h5tools_dump_header_format->groupblockend);
@@ -1678,15 +1683,15 @@ handle_links(hid_t fid, const char *links, void UNUSED * data, int UNUSED pe, co
     } 
     else {
         char *buf = (char *)HDmalloc(linfo.u.val_size);
-        HDfprintf(rawoutstream, "\n");
+        PRINTVALSTREAM(rawoutstream, "\n");
 
         switch(linfo.type) {
         case H5L_TYPE_SOFT:    /* Soft link */
             begin_obj(h5tools_dump_header_format->softlinkbegin, links, h5tools_dump_header_format->softlinkblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             indentation(COL);
             if(H5Lget_val(fid, links, buf, linfo.u.val_size, H5P_DEFAULT) >= 0)
-                HDfprintf(rawoutstream, "LINKTARGET \"%s\"\n", buf);
+                PRINTSTREAM(rawoutstream, "LINKTARGET \"%s\"\n", buf);
             else {
                 error_msg("h5dump error: unable to get link value for \"%s\"\n", links);
                 h5tools_setstatus(EXIT_FAILURE);
@@ -1696,21 +1701,21 @@ handle_links(hid_t fid, const char *links, void UNUSED * data, int UNUSED pe, co
 
         case H5L_TYPE_EXTERNAL:
             begin_obj(h5tools_dump_header_format->udlinkbegin, links, h5tools_dump_header_format->udlinkblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             indentation(COL);
             begin_obj(h5tools_dump_header_format->extlinkbegin, links, h5tools_dump_header_format->extlinkblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             if(H5Lget_val(fid, links, buf, linfo.u.val_size, H5P_DEFAULT) >= 0) {
                 const char *elink_file;
                 const char *elink_path;
 
                 if(H5Lunpack_elink_val(buf, linfo.u.val_size, NULL, &elink_file, &elink_path)>=0) {
                     indentation(COL);
-                    HDfprintf(rawoutstream, "LINKCLASS %d\n", linfo.type);
+                    PRINTSTREAM(rawoutstream, "LINKCLASS %d\n", linfo.type);
                     indentation(COL);
-                    HDfprintf(rawoutstream, "TARGETFILE \"%s\"\n", elink_file);
+                    PRINTSTREAM(rawoutstream, "TARGETFILE \"%s\"\n", elink_file);
                     indentation(COL);
-                    HDfprintf(rawoutstream, "TARGETPATH \"%s\"\n", elink_path);
+                    PRINTSTREAM(rawoutstream, "TARGETPATH \"%s\"\n", elink_path);
                 } 
                 else {
                     error_msg("h5dump error: unable to unpack external link value for \"%s\"\n", links);
@@ -1726,12 +1731,12 @@ handle_links(hid_t fid, const char *links, void UNUSED * data, int UNUSED pe, co
 
         default:
             begin_obj(h5tools_dump_header_format->udlinkbegin, links, h5tools_dump_header_format->udlinkblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             indentation(COL);
             begin_obj(h5tools_dump_header_format->udlinkbegin, links, h5tools_dump_header_format->udlinkblockbegin);
-            HDfprintf(rawoutstream, "\n");
+            PRINTVALSTREAM(rawoutstream, "\n");
             indentation(COL);
-            HDfprintf(rawoutstream, "LINKCLASS %d\n", linfo.type);
+            PRINTSTREAM(rawoutstream, "LINKCLASS %d\n", linfo.type);
             end_obj(h5tools_dump_header_format->udlinkend, h5tools_dump_header_format->udlinkblockend);
             break;
         } /* end switch */
@@ -1785,9 +1790,9 @@ handle_datatypes(hid_t fid, const char *type, void UNUSED * data, int pe, const
         if(idx == type_table->nobjs) {
             if (pe) {
                 /* unknown type */
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 begin_obj(h5tools_dump_header_format->datatypebegin, real_name, h5tools_dump_header_format->datatypeblockbegin);
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
                 indentation(COL);
                 error_msg("unable to open datatype \"%s\"\n", real_name);
                 end_obj(h5tools_dump_header_format->datatypeend, h5tools_dump_header_format->datatypeblockend);
diff --git a/tools/h5dump/h5dump_defines.h b/tools/h5dump/h5dump_defines.h
index 4af5360..66d73e3 100644
--- a/tools/h5dump/h5dump_defines.h
+++ b/tools/h5dump/h5dump_defines.h
@@ -26,20 +26,20 @@
 #define begin_obj(obj,name,begin)                               \
     do {              \
         if (name)                                               \
-            HDfprintf(rawoutstream, "%s \"%s\" %s", (obj), (name), (begin));   \
+            PRINTSTREAM(rawoutstream, "%s \"%s\" %s", (obj), (name), (begin));   \
         else                                                    \
-            HDfprintf(rawoutstream, "%s %s", (obj), (begin));      \
+            PRINTSTREAM(rawoutstream, "%s %s", (obj), (begin));      \
     } while(0);
 
 #define end_obj(obj,end)                                        \
     do {              \
         if(HDstrlen(end)) {                                     \
-            HDfprintf(rawoutstream, "%s", end);                                  \
+            PRINTSTREAM(rawoutstream, "%s", end);                                  \
             if(HDstrlen(obj))                                   \
-                HDfprintf(rawoutstream, " ");                                    \
+                PRINTVALSTREAM(rawoutstream, " ");                                    \
         }                                                       \
         if(HDstrlen(obj))                                       \
-            HDfprintf(rawoutstream, "%s", obj);                                  \
+            PRINTSTREAM(rawoutstream, "%s", obj);                                  \
     } while(0);
 
 
diff --git a/tools/h5dump/testh5dump.sh.in b/tools/h5dump/testh5dump.sh.in
index 88ec698..667908b 100644
--- a/tools/h5dump/testh5dump.sh.in
+++ b/tools/h5dump/testh5dump.sh.in
@@ -261,6 +261,9 @@ $SRC_H5DUMP_TESTFILES/tnamed_dtype_attr.ddl
 $SRC_H5DUMP_TESTFILES/tnestcomp-1.ddl
 $SRC_H5DUMP_TESTFILES/tnestedcmpddt.ddl
 $SRC_H5DUMP_TESTFILES/tnbit.ddl
+$SRC_H5DUMP_TESTFILES/tnoattrdata.ddl
+$SRC_H5DUMP_TESTFILES/tnoattrddl.ddl
+$SRC_H5DUMP_TESTFILES/tnodata.ddl
 $SRC_H5DUMP_TESTFILES/tnoddl.ddl
 $SRC_H5DUMP_TESTFILES/tnoddlfile.ddl
 $SRC_H5DUMP_TESTFILES/tnoddlfile.exp
@@ -796,10 +799,13 @@ COPY_TESTFILES_TO_TESTDIR
 #TOOLTEST h5dump-help.txt -h
 
 # test data output redirection
-#TOOLTEST tnoddl.ddl --enable-error-stack --ddl=NULL -y packedbits.h5
-#TOOLTEST2 trawdatafile.exp --enable-error-stack -y -o trawdatafile.txt packedbits.h5
-#TOOLTEST2 tnoddlfile.exp --enable-error-stack --ddl=NULL -y -o tnoddlfile.txt packedbits.h5
-#TOOLTEST2A twithddlfile.exp twithddl.ddl --enable-error-stack --ddl=twithddl.txt -y -o twithddlfile.txt packedbits.h5
+TOOLTEST tnoddl.ddl --enable-error-stack --ddl=NULL -y packedbits.h5
+TOOLTEST tnodata.ddl --enable-error-stack --output=NULL packedbits.h5
+TOOLTEST tnoattrddl.ddl --enable-error-stack --ddl=NULL -y tattr.h5
+TOOLTEST tnoattrdata.ddl --enable-error-stack -A --output=NULL tattr.h5
+TOOLTEST2 trawdatafile.exp --enable-error-stack -y -o trawdatafile.txt packedbits.h5
+TOOLTEST2 tnoddlfile.exp --enable-error-stack --ddl=NULL -y -o tnoddlfile.txt packedbits.h5
+TOOLTEST2A twithddlfile.exp twithddl.ddl --enable-error-stack --ddl=twithddl.txt -y -o twithddlfile.txt packedbits.h5
 
 # test for maximum display datasets
 TOOLTEST twidedisplay.ddl --enable-error-stack -w0 packedbits.h5
diff --git a/tools/h5ls/h5ls.c b/tools/h5ls/h5ls.c
index 0fc0531..2266480 100644
--- a/tools/h5ls/h5ls.c
+++ b/tools/h5ls/h5ls.c
@@ -1453,7 +1453,7 @@ dump_dataset_values(hid_t dset)
 
     h5tools_str_close(&buffer);
     
-    HDfprintf(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
 }
 
 
@@ -1637,7 +1637,7 @@ list_attr(hid_t obj, const char *attr_name, const H5A_info_t UNUSED *ainfo,
     } 
     h5tools_str_close(&buffer);
 
-    HDfprintf(rawoutstream, "\n");
+    PRINTVALSTREAM(rawoutstream, "\n");
 
     return 0;
 }
@@ -2263,7 +2263,7 @@ list_lnk(const char *name, const H5L_info_t *linfo, void *_iter)
                 grp_literal_g = orig_grp_literal;
             }
             else
-                HDfprintf(rawoutstream, "\n");
+                PRINTVALSTREAM(rawoutstream, "\n");
             }
             break;
 
@@ -2749,7 +2749,7 @@ main(int argc, const char *argv[])
 
             if(file >= 0) {
                 if(verbose_g)
-                    HDfprintf(rawoutstream, "Opened \"%s\" with %s driver.\n", fname, drivername);
+                    PRINTSTREAM(rawoutstream, "Opened \"%s\" with %s driver.\n", fname, drivername);
                 break; /*success*/
             } /* end if */
 
diff --git a/tools/lib/h5tools.c b/tools/lib/h5tools.c
index 3e29cbd..254c8b4 100644
--- a/tools/lib/h5tools.c
+++ b/tools/lib/h5tools.c
@@ -40,6 +40,7 @@ hid_t H5tools_ERR_CLS_g = -1;
 hid_t H5E_tools_g = -1;
 hid_t H5E_tools_min_id_g = -1;
 int         compound_data;
+FILE       *rawattrstream;      /* should initialize to stdout but gcc moans about it */
 FILE       *rawdatastream;      /* should initialize to stdout but gcc moans about it */
 FILE       *rawoutstream;       /* should initialize to stdout but gcc moans about it */
 FILE       *rawerrorstream;     /* should initialize to stderr but gcc moans about it */
@@ -119,6 +120,8 @@ h5tools_init(void)
         H5tools_ERR_STACK_g = H5Ecreate_stack();
         H5TOOLS_INIT_ERROR()
 
+        if (!rawattrstream)
+            rawattrstream = stdout;
         if (!rawdatastream)
             rawdatastream = stdout;
         if (!rawoutstream)
@@ -157,6 +160,12 @@ h5tools_close(void)
         H5Eget_auto2(H5tools_ERR_STACK_g, &tools_func, &tools_edata);
         if(tools_func!=NULL)
             H5Eprint2(H5tools_ERR_STACK_g, rawerrorstream);
+        if (rawattrstream && rawattrstream != stdout) {
+            if (fclose(rawattrstream))
+                perror("closing rawattrstream");
+            else
+                rawattrstream = NULL;
+        }
         if (rawdatastream && rawdatastream != stdout) {
             if (fclose(rawdatastream))
                 perror("closing rawdatastream");
@@ -573,6 +582,9 @@ h5tools_simple_prefix(FILE *stream, const h5tool_format_t *info,
     size_t templength = 0;
     int i, indentlevel = 0;
 
+    if (stream == NULL)
+        return;
+
     if (!ctx->need_prefix)
         return;
 
@@ -581,9 +593,9 @@ h5tools_simple_prefix(FILE *stream, const h5tool_format_t *info,
 
     /* Terminate previous line, if any */
     if (ctx->cur_column) {
-        HDfputs(OPT(info->line_suf, ""), stream);
+        PUTSTREAM(OPT(info->line_suf, ""), stream);
         HDputc('\n', stream);
-        HDfputs(OPT(info->line_sep, ""), stream);
+        PUTSTREAM(OPT(info->line_sep, ""), stream);
     }
 
     /* Calculate new prefix */
@@ -607,23 +619,26 @@ h5tools_simple_prefix(FILE *stream, const h5tool_format_t *info,
        the prefix is printed one indentation level before */
     if (info->pindex) {
         for (i = 0; i < indentlevel - 1; i++) {
-            HDfputs(h5tools_str_fmt(&str, 0, info->line_indent), stream);
+            PUTSTREAM(h5tools_str_fmt(&str, 0, info->line_indent), stream);
         }
     }
 
-    if (elmtno == 0 && secnum == 0 && info->line_1st)
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_1st), stream);
-    else if (secnum && info->line_cont)
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_cont), stream);
-    else
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_pre), stream);
+    if (elmtno == 0 && secnum == 0 && info->line_1st) {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_1st), stream);
+    }
+    else if (secnum && info->line_cont) {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_cont), stream);
+    }
+    else {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_pre), stream);
+    }
 
     templength = h5tools_str_len(&prefix);
 
     for (i = 0; i < indentlevel; i++) {
         /*we already made the indent for the array indices case */
         if (!info->pindex) {
-            HDfputs(h5tools_str_fmt(&prefix, 0, info->line_indent), stream);
+            PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_indent), stream);
             templength += h5tools_str_len(&prefix);
         }
         else {
@@ -662,6 +677,9 @@ h5tools_region_simple_prefix(FILE *stream, const h5tool_format_t *info,
     size_t templength = 0;
     int i, indentlevel = 0;
 
+    if (stream == NULL)
+        return;
+
     if (!ctx->need_prefix)
         return;
 
@@ -670,9 +688,9 @@ h5tools_region_simple_prefix(FILE *stream, const h5tool_format_t *info,
 
     /* Terminate previous line, if any */
     if (ctx->cur_column) {
-        HDfputs(OPT(info->line_suf, ""), stream);
+        PUTSTREAM(OPT(info->line_suf, ""), stream);
         HDputc('\n', stream);
-        HDfputs(OPT(info->line_sep, ""), stream);
+        PUTSTREAM(OPT(info->line_sep, ""), stream);
     }
 
     /* Calculate new prefix */
@@ -696,23 +714,26 @@ h5tools_region_simple_prefix(FILE *stream, const h5tool_format_t *info,
        the prefix is printed one indentation level before */
     if (info->pindex) {
         for (i = 0; i < indentlevel - 1; i++) {
-            HDfputs(h5tools_str_fmt(&str, 0, info->line_indent), stream);
+            PUTSTREAM(h5tools_str_fmt(&str, 0, info->line_indent), stream);
         }
     }
 
-    if (elmtno == 0 && secnum == 0 && info->line_1st)
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_1st), stream);
-    else if (secnum && info->line_cont)
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_cont), stream);
-    else
-        HDfputs(h5tools_str_fmt(&prefix, 0, info->line_pre), stream);
+    if (elmtno == 0 && secnum == 0 && info->line_1st) {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_1st), stream);
+    }
+    else if (secnum && info->line_cont) {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_cont), stream);
+    }
+    else {
+        PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_pre), stream);
+    }
 
     templength = h5tools_str_len(&prefix);
 
     for (i = 0; i < indentlevel; i++) {
         /*we already made the indent for the array indices case */
         if (!info->pindex) {
-            HDfputs(h5tools_str_fmt(&prefix, 0, info->line_indent), stream);
+            PUTSTREAM(h5tools_str_fmt(&prefix, 0, info->line_indent), stream);
             templength += h5tools_str_len(&prefix);
         }
         else {
@@ -766,6 +787,9 @@ h5tools_render_element(FILE *stream, const h5tool_format_t *info,
     int      secnum; /*section sequence number */
     int      multiline; /*datum was multiline  */
 
+    if (stream == NULL)
+        return dimension_break;
+
     s = h5tools_str_fmt(buffer, 0, "%s");
 
     /*
@@ -870,12 +894,12 @@ h5tools_render_element(FILE *stream, const h5tool_format_t *info,
             h5tools_simple_prefix(stream, info, ctx, *curr_pos, secnum);
         }
         else if ((local_elmt_counter || ctx->continuation) && secnum == 0) {
-            HDfputs(OPT(info->elmt_suf2, " "), stream);
+            PUTSTREAM(OPT(info->elmt_suf2, " "), stream);
             ctx->cur_column += HDstrlen(OPT(info->elmt_suf2, " "));
         }
 
         /* Print the section */
-        HDfputs(section, stream);
+        PUTSTREAM(section, stream);
         ctx->cur_column += HDstrlen(section);
     }
 
@@ -1026,12 +1050,12 @@ h5tools_render_region_element(FILE *stream, const h5tool_format_t *info,
             h5tools_region_simple_prefix(stream, info, ctx, local_elmt_counter, ptdata, secnum);
         }
         else if ((local_elmt_counter || ctx->continuation) && secnum == 0) {
-            HDfputs(OPT(info->elmt_suf2, " "), stream);
+            PUTSTREAM(OPT(info->elmt_suf2, " "), stream);
             ctx->cur_column += HDstrlen(OPT(info->elmt_suf2, " "));
         }
 
         /* Print the section */
-        HDfputs(section, stream);
+        PUTSTREAM(section, stream);
         ctx->cur_column += HDstrlen(section);
     }
 
diff --git a/tools/lib/h5tools.h b/tools/lib/h5tools.h
index 4fbd84f..efadba4 100644
--- a/tools/lib/h5tools.h
+++ b/tools/lib/h5tools.h
@@ -36,6 +36,12 @@
 
 #define H5TOOLS_DUMP_MAX_RANK     H5S_MAX_RANK
 
+/* Stream macros */
+#define FLUSHSTREAM(S)           if(S != NULL) HDfflush(S)
+#define PRINTSTREAM(S, F, ...)   if(S != NULL) HDfprintf(S, F, __VA_ARGS__)
+#define PRINTVALSTREAM(S, V)   if(S != NULL) HDfprintf(S, V)
+#define PUTSTREAM(X,S)          if(S != NULL) HDfputs(X, S);
+
 /*
  * Strings for output - these were duplicated from the h5dump.h
  * file in order to support region reference data display
@@ -524,6 +530,7 @@ H5TOOLS_DLLVAR int     packed_bits_num;     /* number of packed bits to display
 H5TOOLS_DLLVAR int     packed_data_offset;  /* offset of packed bits to display */
 H5TOOLS_DLLVAR int     packed_data_length; /* lengtht of packed bits to display */
 H5TOOLS_DLLVAR unsigned long long packed_data_mask;  /* mask in which packed bits to display */
+H5TOOLS_DLLVAR FILE   *rawattrstream;       /* output stream for raw attribute data */
 H5TOOLS_DLLVAR FILE   *rawdatastream;       /* output stream for raw data */
 H5TOOLS_DLLVAR FILE   *rawoutstream;        /* output stream for raw output */
 H5TOOLS_DLLVAR FILE   *rawerrorstream;      /* output stream for raw error */
diff --git a/tools/lib/h5tools_dump.c b/tools/lib/h5tools_dump.c
index c68c699..f83c664 100644
--- a/tools/lib/h5tools_dump.c
+++ b/tools/lib/h5tools_dump.c
@@ -283,9 +283,9 @@ h5tools_dump_simple_data(FILE *stream, const h5tool_format_t *info, hid_t contai
                                      *to the ctx->size_last_dim.   */
 
     /* binary dump */
-    if (bin_output) {
+    if (bin_output && (rawdatastream != NULL)) {
         if (render_bin_output(rawdatastream, container, type, _mem, nelmts) < 0) {
-            HDfprintf(rawoutstream,"\nError in writing binary stream\n");
+            PRINTVALSTREAM(rawoutstream, "\nError in writing binary stream\n");
         }
     } /* end if */
     else {
@@ -1834,7 +1834,7 @@ h5tools_dump_mem(FILE *stream, const h5tool_format_t *info, h5tools_context_t *c
     if (H5Sis_simple(space) <= 0)
         H5E_THROW(FAIL, H5E_tools_min_id_g, "H5Sis_simple failed")
 
-     H5_LEAVE(h5tools_dump_simple_mem(stream, info, ctx, obj_id, type, space, mem))
+     H5_LEAVE(h5tools_dump_simple_mem(rawattrstream, info, ctx, obj_id, type, space, mem))
 
 CATCH
     return ret_value;
diff --git a/tools/lib/h5tools_utils.c b/tools/lib/h5tools_utils.c
index 79322bc..d45eab2 100644
--- a/tools/lib/h5tools_utils.c
+++ b/tools/lib/h5tools_utils.c
@@ -152,8 +152,9 @@ error_msg(const char *fmt, ...)
     va_list ap;
 
     HDva_start(ap, fmt);
-    HDfflush(rawdatastream);
-    HDfflush(rawoutstream);
+    FLUSHSTREAM(rawattrstream);
+    FLUSHSTREAM(rawdatastream);
+    FLUSHSTREAM(rawoutstream);
     HDfprintf(rawerrorstream, "%s error: ", h5tools_getprogname());
     HDvfprintf(rawerrorstream, fmt, ap);
 
@@ -182,8 +183,9 @@ warn_msg(const char *fmt, ...)
     va_list ap;
 
     HDva_start(ap, fmt);
-    HDfflush(rawdatastream);
-    HDfflush(rawoutstream);
+    FLUSHSTREAM(rawattrstream);
+    FLUSHSTREAM(rawdatastream);
+    FLUSHSTREAM(rawoutstream);
     HDfprintf(rawerrorstream, "%s warning: ", h5tools_getprogname());
     HDvfprintf(rawerrorstream, fmt, ap);
     HDva_end(ap);
@@ -388,7 +390,7 @@ indentation(int x)
 {
     if (x < h5tools_nCols) {
         while (x-- > 0)
-            HDfprintf(rawoutstream, " ");
+            PRINTVALSTREAM(rawoutstream, " ");
     } 
     else {
         HDfprintf(rawerrorstream, "error: the indentation exceeds the number of cols.\n");
@@ -414,7 +416,7 @@ indentation(int x)
 void
 print_version(const char *progname)
 {
-    HDfprintf(rawoutstream, "%s: Version %u.%u.%u%s%s\n",
+    PRINTSTREAM(rawoutstream, "%s: Version %u.%u.%u%s%s\n",
            progname, H5_VERS_MAJOR, H5_VERS_MINOR, H5_VERS_RELEASE,
            ((char *)H5_VERS_SUBRELEASE)[0] ? "-" : "", H5_VERS_SUBRELEASE);
 }
@@ -494,9 +496,9 @@ dump_table(char* tablename, table_t *table)
 {
     unsigned u;
 
-    HDfprintf(rawoutstream,"%s: # of entries = %d\n", tablename,table->nobjs);
+    PRINTSTREAM(rawoutstream,"%s: # of entries = %d\n", tablename,table->nobjs);
     for (u = 0; u < table->nobjs; u++)
-    HDfprintf(rawoutstream,"%a %s %d %d\n", table->objs[u].objno,
+        PRINTSTREAM(rawoutstream,"%a %s %d %d\n", table->objs[u].objno,
            table->objs[u].objname,
            table->objs[u].displayed, table->objs[u].recorded);
 }
diff --git a/tools/testfiles/h5dump-help.txt b/tools/testfiles/h5dump-help.txt
index 74fc104..12629c9 100644
--- a/tools/testfiles/h5dump-help.txt
+++ b/tools/testfiles/h5dump-help.txt
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tnoattrdata.ddl b/tools/testfiles/tnoattrdata.ddl
new file mode 100644
index 0000000..a5d40fe
--- /dev/null
+++ b/tools/testfiles/tnoattrdata.ddl
@@ -0,0 +1,39 @@
+HDF5 "tattr.h5" {
+GROUP "/" {
+   ATTRIBUTE "/attr1" {
+      DATATYPE  H5T_STD_I8BE
+      DATASPACE  SIMPLE { ( 24 ) / ( 24 ) }
+      DATA {
+      }
+   }
+   ATTRIBUTE "attr2" {
+      DATATYPE  H5T_STD_I32BE
+      DATASPACE  SIMPLE { ( 10 ) / ( 10 ) }
+      DATA {
+      }
+   }
+   ATTRIBUTE "attr3" {
+      DATATYPE  H5T_IEEE_F64BE
+      DATASPACE  SIMPLE { ( 10 ) / ( 10 ) }
+      DATA {
+      }
+   }
+   ATTRIBUTE "attr4" {
+      DATATYPE  H5T_STD_I32BE
+      DATASPACE  SCALAR
+      DATA {
+      }
+   }
+   ATTRIBUTE "attr5" {
+      DATATYPE  H5T_STRING {
+         STRSIZE 17;
+         STRPAD H5T_STR_NULLTERM;
+         CSET H5T_CSET_ASCII;
+         CTYPE H5T_C_S1;
+      }
+      DATASPACE  SCALAR
+      DATA {
+      }
+   }
+}
+}
diff --git a/tools/testfiles/tnoattrddl.ddl b/tools/testfiles/tnoattrddl.ddl
new file mode 100644
index 0000000..c68877d
--- /dev/null
+++ b/tools/testfiles/tnoattrddl.ddl
@@ -0,0 +1,7 @@
+
+         97, 116, 116, 114, 105, 98, 117, 116, 101, 32, 111, 102, 32, 114, 111,
+         111, 116, 32, 103, 114, 111, 117, 112, 0
+         1, 2, 3, 4, 5, 6, 7, 8, 9, 10
+         0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9
+         100
+         "string attribute"
\ No newline at end of file
diff --git a/tools/testfiles/tnodata.ddl b/tools/testfiles/tnodata.ddl
new file mode 100644
index 0000000..f99d906
--- /dev/null
+++ b/tools/testfiles/tnodata.ddl
@@ -0,0 +1,58 @@
+HDF5 "packedbits.h5" {
+GROUP "/" {
+   DATASET "DS08BITS" {
+      DATATYPE  H5T_STD_I8LE
+      DATASPACE  SIMPLE { ( 8, 8 ) / ( 8, 8 ) }
+      DATA {
+      }
+   }
+   DATASET "DS16BITS" {
+      DATATYPE  H5T_STD_I16LE
+      DATASPACE  SIMPLE { ( 8, 16 ) / ( 8, 16 ) }
+      DATA {
+      }
+   }
+   DATASET "DS32BITS" {
+      DATATYPE  H5T_STD_I32LE
+      DATASPACE  SIMPLE { ( 8, 32 ) / ( 8, 32 ) }
+      DATA {
+      }
+   }
+   DATASET "DS64BITS" {
+      DATATYPE  H5T_STD_I64LE
+      DATASPACE  SIMPLE { ( 8, 64 ) / ( 8, 64 ) }
+      DATA {
+      }
+   }
+   DATASET "DU08BITS" {
+      DATATYPE  H5T_STD_U8LE
+      DATASPACE  SIMPLE { ( 8, 8 ) / ( 8, 8 ) }
+      DATA {
+      }
+   }
+   DATASET "DU16BITS" {
+      DATATYPE  H5T_STD_U16LE
+      DATASPACE  SIMPLE { ( 8, 16 ) / ( 8, 16 ) }
+      DATA {
+      }
+   }
+   DATASET "DU32BITS" {
+      DATATYPE  H5T_STD_U32LE
+      DATASPACE  SIMPLE { ( 8, 32 ) / ( 8, 32 ) }
+      DATA {
+      }
+   }
+   DATASET "DU64BITS" {
+      DATATYPE  H5T_STD_U64LE
+      DATASPACE  SIMPLE { ( 8, 64 ) / ( 8, 64 ) }
+      DATA {
+      }
+   }
+   DATASET "DummyDBL" {
+      DATATYPE  H5T_IEEE_F64BE
+      DATASPACE  SIMPLE { ( 8, 8 ) / ( 8, 8 ) }
+      DATA {
+      }
+   }
+}
+}
diff --git a/tools/testfiles/tnofilename-with-packed-bits.ddl b/tools/testfiles/tnofilename-with-packed-bits.ddl
index 5e6f580..e8b733c 100644
--- a/tools/testfiles/tnofilename-with-packed-bits.ddl
+++ b/tools/testfiles/tnofilename-with-packed-bits.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsIncomplete.ddl b/tools/testfiles/tpbitsIncomplete.ddl
index 10b5a23..0af7386 100644
--- a/tools/testfiles/tpbitsIncomplete.ddl
+++ b/tools/testfiles/tpbitsIncomplete.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsLengthExceeded.ddl b/tools/testfiles/tpbitsLengthExceeded.ddl
index 17dd963..bf1ced8 100644
--- a/tools/testfiles/tpbitsLengthExceeded.ddl
+++ b/tools/testfiles/tpbitsLengthExceeded.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsLengthPositive.ddl b/tools/testfiles/tpbitsLengthPositive.ddl
index 6d05b47..4aa79bd 100644
--- a/tools/testfiles/tpbitsLengthPositive.ddl
+++ b/tools/testfiles/tpbitsLengthPositive.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsMaxExceeded.ddl b/tools/testfiles/tpbitsMaxExceeded.ddl
index eca1248..89a767c 100644
--- a/tools/testfiles/tpbitsMaxExceeded.ddl
+++ b/tools/testfiles/tpbitsMaxExceeded.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsOffsetExceeded.ddl b/tools/testfiles/tpbitsOffsetExceeded.ddl
index b0c655d..2f89be6 100644
--- a/tools/testfiles/tpbitsOffsetExceeded.ddl
+++ b/tools/testfiles/tpbitsOffsetExceeded.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.
diff --git a/tools/testfiles/tpbitsOffsetNegative.ddl b/tools/testfiles/tpbitsOffsetNegative.ddl
index 213641b..e3bca0c 100644
--- a/tools/testfiles/tpbitsOffsetNegative.ddl
+++ b/tools/testfiles/tpbitsOffsetNegative.ddl
@@ -46,6 +46,8 @@ usage: h5dump [OPTIONS] files
                           occur.
      --no-compact-subset  Disable compact form of subsetting and allow the use
                           of "[" in dataset names.
+     -O F, --ddl=F        Output ddl text into file F
+                          Use NULL as filename to suppress ddl display
 
  Subsetting is available by using the following options with a dataset
  attribute. Subsetting is done by selecting a hyperslab from the data.