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comparison objgrep/grep.c @ 167:c25367bb7656

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objgrep: written, compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 00:54:33 +0000
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166:861f5ca49581 167:c25367bb7656
1 /*
2 * objgrep: the actual grep operation
3 */
4
5 #include <sys/types.h>
6 #include <stdio.h>
7 #include <stdint.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11 #include "globals.h"
12
13 do_grep()
14 {
15 uint32_t *match, *mask, *haystack;
16 unsigned matchlen_words, haystack_len_words, haystack_limit;
17 unsigned i, j;
18
19 match = (uint32_t *)pattern_match;
20 mask = (uint32_t *)pattern_mask;
21 haystack = (uint32_t *)binfilemap;
22 matchlen_words = pattern_len >> 2;
23 haystack_len_words = binfile_tot_size >> 2;
24 haystack_limit = haystack_len_words - matchlen_words;
25 for (i = 0; i <= haystack_limit; i++) {
26 for (j = 0; j < matchlen_words; j++)
27 if ((haystack[i+j] & mask[j]) != match[j])
28 goto haystack_next;
29 /* got a match! */
30 match_offset = i << 2;
31 return(1);
32 haystack_next: continue;
33 }
34 return(0);
35 }