On Sat, Dec 27, 2008 at 03:29:05AM +0200, Giorgos Keramidas wrote:
> On Fri, 26 Dec 2008 17:13:39 -0800, Gary Kline <[email protected]> wrote:
> > is there a way i can be sure that my little C program has copied a
> > dos/win file named, say, foo.htm\;7 to simply foo.htm?
> >
> > my program uses fopen/fgets/fputs to copy the markup files. of the
> > several i have copied, no problem. unless i hack cmp or diff, i have
> > to avoid the shell.
> >
> > any ideas? in other words, does anybody have a prefab cmp(oldfile,
> > newfile) fn?
>
> You don't need a prefab `cmp' function, because the base system already
> includes tools that can help:
>
> (a) The `cmp' utility:
>
> cmp file1 file2 ; echo $?
>
> (b) Checksum tools like `md5', `sha1' and `sha256':
>
> md5 file1 file2
>
> sha1 file1 file2
>
> sha256 file1 file2
>
> You can then compare the file checksums. If both the md5 and
> sha256 checksums are identical, then the files are the same[1].
>
> [1] There is a possibility of ``checksum collisions'', especially
> with md5 (see [2] for more details). But if you use two or
> more checksum types and none of them show differences, the
> odds of a collision are small enough for most practical
> purposes.
>
> [2] http://en.wikipedia.org/wiki/Md5#Vulnerability
the problem is that there are several thousands of these files
with dos names and an embedded '\;'7 in the file names. the
shell gets in the way. i have tried
sprintf(cmdbuf, "/usr/bin/cmp %s %s", orig, new);
system(cmdbuf);
chokes on the embedded bytes.
i'm thinking of using
find . -name "*" -print -exec {} \;
and let me program select out the file suffix. i unlink the
screwy dos-ish filename. that's why i want to be sure the
copied/renamed files are right.
>
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--
Gary Kline [email protected] http://www.thought.org Public Service Unix
http://jottings.thought.org http://transfinite.thought.org
The 2.17a release of Jottings: http://jottings.thought.org/index.php
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