CFT: BSD grep

Andrey Chernov ache at
Wed Aug 27 01:32:25 UTC 2008

On Tue, Aug 26, 2008 at 08:25:01PM +0200, Gabor Kovesdan wrote:
> Hello all,
> I've reviewed BSD grep based on your comments and the bug reports I 
> received. The new version is committed to the ports tree as 
> textproc/bsdgrep and there is a base patch available:

Just from quick looking at the sources...

This code looks suspicious:

wend = sscanf(&l->dat[pmatch.rm_eo], "%lc", &wend);

Perhaps it should be

if (sscanf(&l->dat[pmatch.rm_eo], "%lc", &wend) != 1)

The next thing is that perhaps each r = REG_NOMATCH; case should be 
isolated from others in this block (with "else if"?)
F.e. failing mbstowcs() can leave buffer for sscanf() in junk.

wbegin = grep_malloc(mbstowcs(NULL, l->dat, pmatch.rm_so));

grep_malloc() here could terminate program for invalid mbstowcs() 
sequence, but really must set only r = REG_NOMATCH;

Think about files which, for various reasons, may contain not only valid 
MB sequences.

fgrepcomp() uses toupper()/tolower() while should use wide chars analogs 
(MB chars can be in the pattern too). There are also many other places 
where pattern treated as single chars one, fastcomp() etc. grep_cmp() 
compares single chars toupper(data[]) too. There must be no plain ctype 
usage in the whole data _and_ pattern handling code.


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