[Cscope-devel] [ cscope-Bugs-1040690 ] -q mode skews database when files are not readable

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Bugs item #1040690, was opened at 2004-10-05 10:28
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Category: inverted index handling
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Neil Horman (nhorman)
Assigned to: Nobody/Anonymous (nobody)
Summary: -q mode skews database when files are not readable

Initial Comment:
when building an inverted index in cscope, if a file is
placed in the srcfiles list that is unreadable, the
file index in the database file is skewed such that
searches return hits in the wrong files.

To reproduce:

create two source files in a directory: a.c and b.c
create a main function in b.c
create a foo function in a.c
make a.c unreadable (chmod 000 a.c)
run cscope -q
search for the definition of main

The search will return that the defintion was found in
a.c rather than in b.c as it should have

I've attached a patch that corrects this.  As discussed
on the mailing list, this appears to be due to a skew
in the database file which arises from a file being
listed on the srcfiles list, but not having a requisite
database entry added in the crossref() function, since
it returns early if the file is found to be unreadable.
 This patch corrects the issue by placing a minimal
database entry in the database for every file in the
srcfiles list regarless of its readability status.

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