By default, MIDAS creates shared memory event data buffers of default size
EVENT_BUFFER_SIZE defined in midas.h and until now making of large data buffers
for high data rate or large event size experiments was complicated.

Now, bm_open_buffer() will try to read the event buffer size from ODB. If
"/Experiment/Buffer Sizes/BUFFER_NAME" of type DWORD exists, it's value is used
as the buffer size, overriding the default value.

For example, to increase the size of the default MIDAS event buffer ("SYSTEM")
to 2000000 bytes, shutdown all MIDAS programs, delete the old .SYSTEM.SHM file
(and the shared memory segment, using ipcrm). Then run odbedit, cd /Experiment,
mkdir "Buffer Sizes", cd "Buffer Sizes", create DWORD SYSTEM, set SYSTEM
2000000. Then start the rest of the MIDAS programs. Check that the buffer has
the correct size by looking at the size of .SYSTEM.SHM and of the shared memory
segment (ipcs).

This method work for all MIDAS buffers, except for ODB, where the size has to be
specified at creation time using the odbedit command "-s" argument.

K.O.

We have been seeing consistent user memory corruption while setting up a new
experiment. This has been traced to a user memory overwrite in ODB db_set_data()
function and this problem is now fixed. This error was triggered by our frontend
code constantly changing the size of a MIDAS data bank that was also written
into ODB via the RO_ODB option. K.O.

While investigating the mhttpd password error with the MacOS Safari browser, I
found that it was caused by an strcpy() buffer overflow. With Stefan's blessing,
I now converted most uses of strcpy() and strcat() to strlcpy() and strlcat().

This fixes the Safari password problem (it was memory corruption in mhttpd).

While validating these changes, I also found an incorrect use of sizeof() in the
mhttpd history code for plotting run markers. I fixed that as well.

P.S. The remaining strcpy() calls look safe wrt buffer overflows. There are no
strcat() calls left. But there is still a large number of unsafe-looking
sprintf() uses.

K.O.

I observe that the mhttpd passwords do not work correctly for the Safari web browser on MacOS 10.4.7: 
Safari 2.0.4 (419.3). For example, I cannot submit elog messages- the system gets stuck on the 
"Password" page. The Safari browser in MacOS 10.3 works fine. Mozilla/Firefox works fine. (Also would be 
useful if "remember password" worked with MIDAS, in any browser). K.O.