2 files changed, 40 insertions, 22 deletions

diff --git a/tools/h5jam/h5jam.c b/tools/h5jam/h5jam.c
index 4509734..ae45714 100644
--- a/tools/h5jam/h5jam.c
+++ b/tools/h5jam/h5jam.c
@@ -21,7 +21,7 @@
 /* Name of tool */
 #define PROGRAMNAME "h5jam"
 
-hsize_t write_pad (int, hsize_t);
+herr_t write_pad(int ofile, hsize_t old_where, hsize_t *new_where);
 hsize_t compute_user_block_size (hsize_t);
 hsize_t copy_some_to_file (int, int, hsize_t, hsize_t, ssize_t);
 void parse_command_line (int, const char *[]);
@@ -380,7 +380,13 @@ main (int argc, const char *argv[])
     where = copy_some_to_file (ufid, ofid, (hsize_t) 0, startub, (ssize_t) - 1);
 
     /* pad the ub */
-    where = write_pad (ofid, where);
+    if(write_pad(ofid, where, &where) < 0) {
+        error_msg("Can't pad file \"%s\"\n", output_file);
+        HDclose (h5fid);
+        HDclose (ufid);
+        HDclose (ofid);
+        leave (EXIT_FAILURE);
+    } /* end if */
 
     if(ub_file)
         HDfree (ub_file);
@@ -534,25 +540,32 @@ compute_user_block_size(hsize_t ublock_size)
 /*
  *  Write zeroes to fill the file from 'where' to 512, 1024, etc. bytes.
  *
- *  Returns the size of the padded file.
+ *  Sets new_where to the size of the padded file and
+ *  returns SUCCEED/FAIL.
  */
-hsize_t
-write_pad(int ofile, hsize_t where)
+herr_t
+write_pad(int ofile, hsize_t old_where, hsize_t *new_where)
 {
     unsigned int i;
     char buf[1];
     hsize_t psize;
 
+    HDassert(new_where);
+
     buf[0] = '\0';
 
-    HDlseek(ofile, (off_t) where, SEEK_SET);
+    HDlseek(ofile, (off_t)old_where, SEEK_SET);
 
-    psize = compute_user_block_size (where);
-    psize -= where;
+    psize = compute_user_block_size(old_where);
+    psize -= old_where;
 
     for(i = 0; i < psize; i++)
-        HDwrite (ofile, buf, 1);
+        if(HDwrite(ofile, buf, 1) < 0)
+            return FAIL;
 
-    return(where + psize);  /* the new size of the file. */
-}
+    /* Set the new size of the file. */
+    *new_where = old_where + psize;
+
+    return SUCCEED;
+} /* end write_pad() */
 
diff --git a/tools/h5jam/h5jamgentest.c b/tools/h5jam/h5jamgentest.c
index d3166b5..7ae3169 100644
--- a/tools/h5jam/h5jamgentest.c
+++ b/tools/h5jam/h5jamgentest.c
@@ -275,20 +275,23 @@ gent_ub(const char * filename, size_t ub_size, size_t ub_fill)
   /* If a user block is being used, write to it here */
   if(ub_size > 0)
   {
-        HDassert(ub_size <= BUF_SIZE);
+    ssize_t nbytes;
 
-  fd = HDopen(filename, O_RDWR, 0);
-        HDassert(fd >= 0);
+    HDassert(ub_size <= BUF_SIZE);
 
-  /* fill buf with pattern */
-  HDmemset(buf, '\0', ub_size);
-  bp = buf;
-  for (u = 0; u < ub_fill; u++)
-            *bp++ = pattern[u % 10];
+    fd = HDopen(filename, O_RDWR, 0);
+    HDassert(fd >= 0);
 
-  HDwrite(fd, buf, ub_size);
+    /* fill buf with pattern */
+    HDmemset(buf, '\0', ub_size);
+    bp = buf;
+    for (u = 0; u < ub_fill; u++)
+      *bp++ = pattern[u % 10];
 
-  HDclose(fd);
+    nbytes = HDwrite(fd, buf, ub_size);
+    HDassert(nbytes >= 0);
+
+    HDclose(fd);
   }
 }
 
@@ -299,6 +302,7 @@ create_textfile(const char *name, size_t size)
     int fd;
     size_t i;
     char *bp;
+    ssize_t nbytes;
 
     fd = HDcreat(name,0777);
     HDassert(fd >= 0);
@@ -310,7 +314,8 @@ create_textfile(const char *name, size_t size)
     for(i = 0; i < size; i++)
         *bp++ = pattern[i % 10];
 
-    HDwrite(fd, buf, size);
+    nbytes = HDwrite(fd, buf, size);
+    HDassert(nbytes >= 0);
 
     HDfree(buf);