1 files changed, 59 insertions, 10 deletions

diff --git a/tools/h5diff/h5diff_common.c b/tools/h5diff/h5diff_common.c
index 9b6037e..a678b2f 100644
--- a/tools/h5diff/h5diff_common.c
+++ b/tools/h5diff/h5diff_common.c
@@ -42,6 +42,7 @@ static struct long_options l_opts[] = {
     { "use-system-epsilon", no_arg, 'e' },
     { "follow-symlinks", no_arg, 'l' },
     { "no-dangling-links", no_arg, 'x' },
+    { "exclude-path", require_arg, 'E' },
     { NULL, 0, '\0' }
 };
 
@@ -64,6 +65,7 @@ void parse_command_line(int argc,
 {
 
     int opt;
+    struct exclude_path_list *exclude_head, *exclude_prev, *exclude_node;
 
     /* process the command-line */
     memset(options, 0, sizeof (diff_opt_t));
@@ -74,6 +76,9 @@ void parse_command_line(int argc,
     /* NaNs are handled by default */
     options->do_nans = 1;
 
+    /* init for exclude-path option */
+    exclude_head = NULL;
+
     /* parse command line options */
     while ((opt = get_option(argc, argv, s_opts, l_opts)) != EOF)
     {
@@ -104,6 +109,35 @@ void parse_command_line(int argc,
         case 'x':
             options->no_dangle_links = 1;
             break;
+        case 'E':
+            options->exclude_path = 1;
+            
+            /* create linked list of excluding objects */
+            if( (exclude_node = (struct exclude_path_list*) malloc(sizeof(struct exclude_path_list))) == NULL)
+            {
+                printf("Error: lack of memory!\n");
+                h5diff_exit(EXIT_FAILURE);
+            }
+
+            /* init */
+            exclude_node->obj_path = opt_arg;
+            exclude_node->obj_type = H5TRAV_TYPE_UNKNOWN;
+            exclude_prev = exclude_head;
+            
+            if (NULL == exclude_head)            
+            {
+                exclude_head = exclude_node;
+                exclude_head->next = NULL;
+            }
+            else
+            {
+                while(NULL != exclude_prev->next)
+                    exclude_prev=exclude_prev->next;
+
+                exclude_node->next = NULL;
+                exclude_prev->next = exclude_node;
+            }            
+            break;
         case 'd':
             options->d=1;
 
@@ -163,6 +197,10 @@ void parse_command_line(int argc,
         }
     }
 
+    /* if exclude-path option is used, keep the exclude path list */
+    if (options->exclude_path)
+        options->exclude = exclude_head;
+
     /* if use system epsilon, unset -p and -d option */
     if (options->use_system_epsilon)
         options->d = options->p = 0;
@@ -351,7 +389,7 @@ check_d_input( const char *str )
 
 void usage(void)
 {
- printf("usage: h5diff [OPTIONS] file1 file2 [obj1[obj2]] \n");
+ printf("usage: h5diff [OPTIONS] file1 file2 [obj1[ obj2]] \n");
  printf("  file1                    File name of the first HDF5 file\n");
  printf("  file2                    File name of the second HDF5 file\n");
  printf("  [obj1]                   Name of an HDF5 object, in absolute path\n");
@@ -425,18 +463,29 @@ void usage(void)
 
  printf("\n");
 
- printf(" Compare criteria\n");
- printf("  If no objects [obj1[obj2]] are specified, h5diff only compares objects\n");
- printf("  with the same absolute path in both files\n");
+ printf(" File comparison:\n");
+ printf("  If no objects [obj1[ obj2]] are specified, the h5diff comparison proceeds as\n");
+ printf("  a comparison of the two files' root groups.  That is, h5diff first compares\n");
+ printf("  the names of root group members, generates a report of root group objects\n");
+ printf("  that appear in only one file or in both files, and recursively compares\n");
+ printf("  common objects.\n");
  printf("\n");
 
- printf(" The compare criteria is:\n");
- printf("  1) datasets: numerical array differences\n");
- printf("  2) groups: name string difference\n");
- printf("  3) datatypes: the return value of H5Tequal\n");
- printf("  4) links: name string difference of the linked value as default\n");
- printf("            (refer to --follow-symlinks option).\n");
+ printf(" Object comparison:\n");
+ printf("  1) Groups \n");
+ printf("      First compares the names of member objects (relative path, from the\n");
+ printf("      specified group) and generates a report of objects that appear in only\n");
+ printf("      one group or in both groups. Common objects are then compared recursively.\n");
+ printf("  2) Datasets \n");
+ printf("      Array rank and dimensions, datatypes, and data values are compared.\n");
+ printf("  3) Datatypes \n");
+ printf("      The comparison is based on the return value of H5Tequal.\n");
+ printf("  4) Symbolic links \n");
+ printf("      The paths to the target objects are compared.\n");
+ printf("      (The option --follow-symlinks overrides the default behavior when\n");
+ printf("       symbolic links are compared.).\n");
  printf("\n");
+
  printf(" Exit code:\n");
  printf("  0 if no differences, 1 if differences found, 2 if error\n");
  printf("\n");