+ return i;
+}
+
+struct heap_info {
+ struct {
+ struct key_file **file;
+ char **buf;
+ } info;
+ int heapnum;
+ int *ptr;
+ int (*cmp)(const void *p1, const void *p2);
+};
+
+struct heap_info *key_heap_init (int nkeys,
+ int (*cmp)(const void *p1, const void *p2))
+{
+ struct heap_info *hi;
+ int i;
+
+ hi = xmalloc (sizeof(*hi));
+ hi->info.file = xmalloc (sizeof(*hi->info.file) * (1+nkeys));
+ hi->info.buf = xmalloc (sizeof(*hi->info.buf) * (1+nkeys));
+ hi->heapnum = 0;
+ hi->ptr = xmalloc (sizeof(*hi->ptr) * (1+nkeys));
+ hi->cmp = cmp;
+ for (i = 0; i<= nkeys; i++)
+ {
+ hi->ptr[i] = i;
+ hi->info.buf[i] = xmalloc (512);
+ }
+ return hi;
+}
+
+static void key_heap_swap (struct heap_info *hi, int i1, int i2)
+{
+ int swap;
+
+ swap = hi->ptr[i1];
+ hi->ptr[i1] = hi->ptr[i2];
+ hi->ptr[i2] = swap;
+}
+
+
+static void key_heap_delete (struct heap_info *hi)
+{
+ int cur = 1, child = 2;
+
+ assert (hi->heapnum > 0);
+
+#if 1
+ key_heap_swap (hi, 1, hi->heapnum);
+ hi->heapnum--;
+#else
+ hi->ptr[1] = hi->ptr[hi->heapnum--];
+#endif
+ while (child <= hi->heapnum) {
+ if (child < hi->heapnum &&
+ (*hi->cmp)(&hi->info.buf[hi->ptr[child]],
+ &hi->info.buf[hi->ptr[child+1]]) > 0)
+ child++;
+ if ((*hi->cmp)(&hi->info.buf[hi->ptr[cur]],
+ &hi->info.buf[hi->ptr[child]]) > 0)
+ {
+ key_heap_swap (hi, cur, child);
+ cur = child;
+ child = 2*cur;
+ }
+ else
+ break;
+ }
+}
+
+static void key_heap_insert (struct heap_info *hi, const char *buf, int nbytes,
+ struct key_file *kf)
+{
+ int cur, parent;
+
+ cur = ++(hi->heapnum);
+ memcpy (hi->info.buf[hi->ptr[cur]], buf, nbytes);
+ hi->info.file[hi->ptr[cur]] = kf;
+
+ parent = cur/2;
+ while (parent && (*hi->cmp)(&hi->info.buf[hi->ptr[parent]],
+ &hi->info.buf[hi->ptr[cur]]) > 0)
+ {
+ key_heap_swap (hi, cur, parent);
+ cur = parent;
+ parent = cur/2;
+ }
+}
+
+static int heap_read_one (struct heap_info *hi, char *name, char *key)
+{
+ int n, r;
+ char rbuf[512];
+ struct key_file *kf;
+
+ if (!hi->heapnum)
+ return 0;
+ n = hi->ptr[1];
+ strcpy (name, hi->info.buf[n]);
+ kf = hi->info.file[n];
+ r = strlen(name);
+ memcpy (key, hi->info.buf[n] + r+1, KEY_SIZE);
+ key_heap_delete (hi);
+ if ((r = key_file_read (kf, rbuf)))
+ key_heap_insert (hi, rbuf, r, kf);
+ no_iterations++;