Find an insensitive string in big text file. faster than cat and grep. supports multiple keywords, separated by space. no regex support.

cari.c

/*  cari string di file, case insensitive
    support multiple keyword, tapi bukan regex. diisah by spasi aja
    
    find an insensitive string in big raw text. faster than cat and grep.
    supports multiple keywords, separated by space. no regex support.
    
    @judotens
    
    ./cari bigfile.txt keyword

*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void main(int argc, char *argv[])
{ 
  int i;
  FILE *fp;
  char * line = NULL;
  size_t len = 0;
  size_t read;

  if (argc == 1)
  {
    printf("Cara pakai: %s <file> <keyword_1> <keyword_2> <keyword_n>\n", argv[0]);
    exit(EXIT_SUCCESS);
  }

  fp=fopen(argv[1],"r");
  if (fp == NULL)
    exit(EXIT_FAILURE);

  while ((read = getline(&line, &len, fp)) != -1)
  { 
    for(i=2; i < argc; i++)
    {
      if (strcasestr(line,argv[i]))
      {
        printf("%s", line);
      }
    }
  }
  if (line)
    free(line);
  fclose(fp);
  exit(EXIT_SUCCESS);
}

gistfile1.txt

# standar cat & grep
$ time cat ~/testing.txt | grep -i gw | head -n 2
1319734881	djaycoholyc	TweetCaster for Android	Makasar	Yang ga terpuaskan sama #memetwit gw itu si penulis Jakarta Underkompor si @arhamkendari lagi cerita juga. Intronya bangke XD
1319735029	purnamasyarii	ÃœberSocial for BlackBerry	Jakarta	@arilupus amiinn, eh ri, lu msih punya file2 lab PSBD kaga ? Mau dong gw :D

real	0m0.027s
user	0m0.025s
sys	0m0.007s


# using this tools
$ time ./cari ~/testing.txt gw | head -n 2
1319734881	djaycoholyc	TweetCaster for Android	Makasar	Yang ga terpuaskan sama #memetwit gw itu si penulis Jakarta Underkompor si @arhamkendari lagi cerita juga. Intronya bangke XD
1319735029	purnamasyarii	ÃœberSocial for BlackBerry	Jakarta	@arilupus amiinn, eh ri, lu msih punya file2 lab PSBD kaga ? Mau dong gw :D

real	0m0.006s
user	0m0.004s
sys	0m0.003s