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1992-06-27
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FCOPY 3.2 - June 27, 1992
Modified fcopy() to delete the bad target file when the copy operation
fails. In earlier versions, it was up to the calling function to delete
the file; otherwise, it would be left on the disk.
------------------------------------------------------------------------
FCOPY 3.1 - May 12, 1992
There was a bug in the truename function that would cause a crash when
using a DOS version earlier than 3.0 in a large data model. This has
been fixed in this release.
Also, most of the assembler modules have been revised. Functions now
make no assumptions about the setting of DS upon entry. In large data
models (compact and large models) DS is set to the default data segment
so that the global variables errno and _doserrno can be set upon error.
Similarly, in the huge model DS is set to the segment containing errno
and _doserrno. This distinction is necessary since Turbo C/C++ does not
use a default data segment in the huge model -- all huge modules have
their own data segment. Microsoft C/C++ compilers do not treat the huge
model in this way; however, these functions will work with either
Borland or Microsoft compilers.
------------------------------------------------------------------------
FCOPY 3.0 - April 19, 1992
In this version, the function _fcopy was renamed to fcopy (without the
leading underscore). Source code using an earlier version needs to be
changed accordingly.
This version adds a new function (truename) which gets the canonical
(fully qualified) path name, given a filename specification. fcopy uses
this function to determine if the source and target filespecs actually
refer to the same file. truename requires DOS 3.0 or later, so there is
only limited protection against attempts to copy a file onto itself with
earlier versions of DOS. If anyone is REALLY interested, I might add a
DOS 2.X capability to truename. I didn't make the effort in this
particular version because I suspect there are relatively few people
still using DOS versions below 3.0. truename is a general purpose
function that can be used in other programs.
Another new general purpose function (strtrim) has also been added.
This function trims leading and trailing whitespace from a string. Most
DOS functions that take a filespec as a parameter expect the string to
have no leading or trailing spaces, and strtrim can be used ahead of
these calls to ensure that the filespec is properly formed.
------------------------------------------------------------------------
Also included are the original file read and write functions: farread
and farwrite. While not used in fcopy since version 1.1, they are still
useful general purpose functions, especially when large file buffers are
needed for speed.
All of the above are written in assembler and support all memory models.
At the request of several people, I have compiled/assembled all of the
modules for each memory model and have included them in this archive as
libraries. They are named FCOPYx.LIB, where x designates the memory
model used: S = small, M = medium, C = compact, L = large, H = Huge.
Most any library utility can be used to extract the object modules as
desired.
Finally, for those who like things simpler, also included is the archive
file FCOPY22. This is smaller than the 3.X version, but does not
protect against attempts to copy a file onto itself. If this isn't
important to you, the 2.2 version may be all you need.
------------------------------------------------------------------------
Ray Waters
CompuServe ID 72261,33
June 27, 1992