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Old 06-21-2007, 03:49 AM   #1
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writing a c code for scanning files for certain phrases

hello all,
i wanna write a c code,that scans a large file for certain phrases.
ideally,code should get 2 files as contains the phrases
and other the file that is to be scanned.

wot should the approach be like???
Old 06-21-2007, 03:52 AM   #2
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grep -f file

Old 06-21-2007, 06:52 AM   #3
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thanx a lot,
actually i wanna write a code that can do that,which then i 'll need to modify
for some other purposes.
i went thru the source of grep ,but couldnt grasp much.

cud anyone tell ,wot apprch does that follow??
Old 06-21-2007, 12:47 PM   #4
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Your problem is classified as primarily a searching problem. As such, you will want to use an algorithm that is optimized for that task. Googling 'string search algorithm' will lead you to numerous resources for such algorithms. The requirements of your specific application should dictate which algorithm you choose. If you wish to make your string searcher into something more general (and at the same time more powerful), you may wish to look at lex & yacc (flex & bison in Gnu-speak) to create a more grep-like tool. I would consider this to be a different genre than string searching.

--- rod.

Last edited by theNbomr; 06-21-2007 at 12:51 PM.


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