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bitstr_64.c

#include <linux/module.h>
#include <linux/bitops.h>

/* Find string of zero bits in a bitmap */ 
unsigned long 
find_next_zero_string(unsigned long *bitmap, long start, long nbits, int len)
{ 
      unsigned long n, end, i;      

 again:
      n = find_next_zero_bit(bitmap, nbits, start);
      if (n == -1) 
            return -1;
      
      /* could test bitsliced, but it's hardly worth it */
      end = n+len;
      if (end > nbits)
            return -1; 
      for (i = n+1; i < end; i++) { 
            if (test_bit(i, bitmap)) {  
                  start = i+1; 
                  goto again; 
            } 
      }
      return n;
}

EXPORT_SYMBOL(find_next_zero_string);

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