Main program for timing and testing

#include 
#include 
#include 
#include 
#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 */