/********************************************************************************
 # $FreeBSD: primes.c,v 1.0 2003/01/13 00:00:00 artis Exp
 #

 I decided to tweak IP Filter state table size :) and also Qmail and also ...
 but it was hard to google prime number generator, so I wrote my own.

 to compile: 'gcc -Wall primes.c -o /usr/local/bin/primes'
 to use:     'primes 1 100'
********************************************************************************/
#include <stdio.h>
#include <string.h>
#include <sysexits.h>

void stop_hacker(char *);

int
main(int argc, char *argv[])
{
  int n1, n2;
  if (argc != 3) stop_hacker(argv[0]);
  sscanf(argv[1], "%d", &n1);
  sscanf(argv[2], "%d", &n2);
  if (n1 > 0 && n2 > 0 && n1 < n2 && n1 >= 1) {
    int i;
    while (n1 <= n2) {
      for (i = 2; i < n1; i++) 
        if (n1%i == 0) break;
      if (i++ == n1) printf("%d\n", n1);
      n1++;
    }
  }
  else stop_hacker(argv[0]);

exit(EX_OK);
}

void stop_hacker(char *progname)
{
  fprintf(stderr, "usage: '%s <n1> <n2>'\n", strrchr(progname, '/') ? strrchr(progname, '/') + 1 : progname);
  exit(EX_USAGE);
}