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Old 06-12-2015, 02:09 AM   #1
rpittala
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Unhappy diff command reports 256 error value instead of success and failure results


Hi All,

When I run a script in perl, something like below: I`m stuck up in the error result as 256. Appreciate the solution for the below script
using:sunOS 5.10
Quote:
my $result = system("diff Tmp_IcdGenFile_log.c Tmp_DumpFile_log.c");
 
Old 06-12-2015, 04:13 AM   #2
pan64
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looks like it is a perl script, isn't it?
http://perldoc.perl.org/functions/system.html
 
Old 06-12-2015, 04:23 AM   #3
rpittala
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Yes, it is perl script..the question is simple,I just want to know whether both files are same or not.

is there any other way to know this with diff ? (or) in any alternate way ?

Last edited by rpittala; 06-12-2015 at 05:16 AM.
 
Old 06-12-2015, 05:44 AM   #4
pan64
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so read the page I sent you, how should you check the result:
Code:
 printf "child exited with value d\n", $? >> 8;
but in case of small files you can read them into variables and you only need to compare to variables inside perl.
http://www.perlhowto.com/read_the_co...nto_a_variable
 
Old 06-12-2015, 06:44 AM   #5
rpittala
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yes, I had gone through the link provided by you and the child exit status 1 after >>8.

The return value of the system command for "diff" is not as expected and even I tried the system command for "cmp".

Finally, I need to copy the differ files(ignoring the comment sections) to other locations

below is code:
FYI..
working on sunOS 5.10-->"diff -q" command won`t work for us

Quote:
system("cp $F_GPath Tmp_IcdGenFile_o_log.c");
system("cp $F_DPath Tmp_DumpFile_n_log.c");
system("cpp -p -fpreprocessed Tmp_IcdGenFile_o_log.c > Tmp_IcdGenFile_log.c");

system("cpp -p -fpreprocessed Tmp_DumpFile_n_log.c > Tmp_DumpFile_log.c");

if(system("diff Tmp_IcdGenFile_log.c Tmp_DumpFile_log.c") == 0) {
print "There is no difference in the file $F_DPath\n";
}#-b option added to ignore whitespace --ignore-matching-lines='^#'
elsif($? == 1) {
print "yes, there is a difference in the file $F_DPath\n";
 
Old 06-12-2015, 06:50 AM   #6
NevemTeve
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please read the manual of waitpid(2) especially the meaning of 'status' parameter
 
Old 06-12-2015, 07:18 AM   #7
rpittala
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Basically, I`m an embedded professional. So, I`m aware of the system calls being used for.
Surprised to see the return values of the system call for diff in perl.

Actually, what the "system("diff file1 file2")" should return in general(I suppose in perl)?
 
Old 06-12-2015, 07:42 AM   #8
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Now, I understood the issue.

Some how when I do cpp -p -fpreprocessed -E Tmp_IcdGenFile.c >log.txt ..etc to remove the comments in a file.

The file name along with the line numnber(i.e., ex# 44 Tmp_IcdGenFile_o_log.c) is being appended twice in the log file and when I take the diff of the generated two log files.
The out put of the diff is always different(as the line number and the file names are always different).

Now, the question comes here is, how to avoid the appending file name and line number while generating the log files ?

As we know during the processing stage the comments are ignored and hence the approach is being implemented.

I would have used "cc -E file". But, because of some version issues of the compiler trying to run the command in cpp.
 
Old 06-12-2015, 08:29 AM   #9
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What is the actual problem you want to solve? What is your goal?
 
Old 06-13-2015, 12:28 AM   #10
rpittala
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My actual goal is simple:

1)need to ignore the comments in two files located in different paths(say ../home/rajesh/core/modified.c and /home/rajesh/modified.c)
-> if we edit one file(say /home/rajesh/modified.c file) in the comment section we need to considered it as no change to the file and if we change in other places need to consider it as a change in the file
2)If it is a change in the file as per the above conditions, the file need to be moved to other location (i.e., by renaming the older(mv /home/rajesh/core/modified.c /home/rajesh/core/modified_old.c) file and copy the changed file to the location(cp /home/rajesh/modified.c /home/rajesh/core/modified.c))

and I`m stuck @ removing the comment from the .c file(as it is appending the file name and line number in the file) result in always a change in the file while taking the diff.

Hope this will help you to understand the issue here.

Last edited by rpittala; 06-13-2015 at 04:19 AM.
 
Old 06-13-2015, 02:33 AM   #11
NevemTeve
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And what if you change eight spaces to a Tab? Do you consider that different?

Maybe you should create Assembly source from both files (cc -S) and compare those.

And forget perl. That's what shell scripts are meant for.
 
Old 06-13-2015, 04:15 AM   #12
rpittala
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Yes, even a single space is under consideration.
 
Old 06-15-2015, 05:58 AM   #13
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Hi Folks,

Thanks for the support.

I`m able to take the diff now by just simply removing the matched string in the file
Quote:
system("cpp -p -fpreprocessed Tmp_DumpFile_n_log.c | grep -v 'Tmp_DumpFile_n_log.c' > Tmp_DumpFile_log.c");
Just did this
 
Old 06-17-2015, 08:06 AM   #14
rpittala
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and this works as well, simple command and no more line markers. We should be able to get the clean c code with out comments
Quote:
gcc -p -fpreprocessed -dD -E file.c
 
  


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