On Sun, 8 Apr 2012 11:15:55 -0700, Sam Siegel wrote:
>
>Paul - Thanks for the tips. The code does not create any path segments.
>
You're welcome.
>My goal here is to be able to point the user to the reference manuals so
>they can determine what is appropriate for their use. It is
>their responsibility to allocate a buffer large enough to hold any
>path/file name they create. When they call my function, they provide the
>address of the buffer and the number of bytes in the buffer. A new buffer
>is allocated (specified size + 2) and the specified number of bytes are
>copied and a tailing x'0000' is appended. My buffer is passed to the
>C/C++ runtime fopen function. If the path/filename provided is invalid,
>the open fails and the error is returned to the caller.
>
Sounds like assembler code insofar as it uses address/length rather
than a null-terminated string. So portability is less a concern.
>It is
>their responsibility to allocate a buffer large enough to hold any
>path/file name they create.
In which case, it depends not on a system limit nor on any
limit in your code, but on how long a pathname the user
intends to create. From what I glean from POSIX and the
z/390 C/C++ RTL, the limits are to be regarded as dynamic,
and available from dynamic queries by:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/edclb1b0/3.661
3.661 pathconf() -- Determine configurable path name variables
which sounds sort of circular: in order to ask how long a pathname
is allowed, you must provide some sort of pathname (in the same
filesystem?) as input. The operant word is "configurable"; i.e.
subject to change.
The underlying Assembler callable service is:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/bpxzb1b0/2.126
2.126 pathconf (BPX1PCF, BPX4PCF)
(Yes, when I first learned about this, I thought it was BS; PITA.)
-- gil
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