[svn-r24202] Bug fix: HDFFV-8271 Big.c error in address generated by random number.

Description:
There is a bug in the current big.c tests. In a nut-shell,
the writing part randomly picks 50 locations and write 4KB
from that location. Random location range is from byte 0
to end of dataset. There is the problem--if the random location
is greater than (end of dataset - 4KB), then error.

Solution:
Adjust the random number to be at least 4KB less than the end of the
dataset. That allows it write 4KB more from the generated starting
position.

Tested: h5comittest plus jam serial build and test.

1 files changed, 2 insertions, 1 deletions

diff --git a/test/big.c b/test/big.c
index 5a70c26..831a2ed 100644
--- a/test/big.c
+++ b/test/big.c
@@ -435,7 +435,8 @@ writer (char* filename, hid_t fapl, fsizes_t testsize, int wrt_n)
     hs_size[0] = WRT_SIZE;
     if ((mem_space = H5Screate_simple (1, hs_size, hs_size)) < 0) goto error;
     for (i=0; i<wrt_n; i++) {
-        hs_start[0] = randll (size2[0], i);
+	/* start position must be at least hs_size from the end */
+        hs_start[0] = randll (size2[0]-hs_size[0], i);
         HDfprintf (out, "#%03d 0x%016Hx\n", i, hs_start[0]);
         if (H5Sselect_hyperslab (space2, H5S_SELECT_SET, hs_start, NULL,
                 hs_size, NULL) < 0) goto error;