#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define MB 400000
#define MP 256
#define NCOPY 3
char *txtbuf;
int xxxFind(int n, char *txt, int m, char *pat);
main(int argc, char **argv)
{
   char patbuf[MP];
   FILE *in;
   int i, m, n, t0, t1;
   int nmatch = 0;
   if (argc < 3) {
      fprintf(stderr, "usage: %s pattern file\n", argv[0]);
      exit(0);
   }
   if ((in = fopen(argv[2], "r")) == NULL) {
      fprintf(stderr, "cannot open input file: %s\n", argv[2]);
      exit(0);
   }
   strcpy(patbuf, argv[1]);
   m = strlen(patbuf);
   txtbuf = malloc(NCOPY * MB);
   n = 0;
   for (i = 0; i < NCOPY; i++) {
      n += fread(txtbuf+n, sizeof(char), MB, in);
      rewind(in);
   }
   close(in);
   t0 = clock(); 
   nmatch = xxxFind(n, txtbuf, m, patbuf);
   t1 = clock() - t0;
   printf("%d matches took %.3f\n", nmatch, (float)t1/CLOCKS_PER_SEC);
}
/* End of File */