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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/share/graphviz/gvpr/knbhd

/* knbhd - Return the k-neighborhood of a node, i.e., allnodes
 * whose path length from the given node is <= k.
 * ARGV[] = k node_name
 */
BEG_G {
  node_t  ctr;
  int     maxlen;

  graph_t comp = subg($, "kcomp");
  int     sid = 0, eid = 0;
  int     curlen;
  node_t  curnode;
  int     nlen[node_t];
  node_t  stk[int];
  node_t  other;
  edge_t  e;

  if (ARGC != 2) {
    printf (2, "Two arguments required\n");
    exit(1);
  }

  if (!sscanf(ARGV[0],"%d",&maxlen)) {
    printf (2, "Improper length parameter \"%s\"\n", ARGV[0]);
    exit(1);
  }
  maxlen++; /* length of 0 means unset */

  ctr = isNode ($, ARGV[1]);
  if (!ctr) {
    printf (2, "node %s not found\n", ARGV[1]);
    exit(1);
  }

  subnode (comp,ctr);
  nlen[ctr] = 1;
  curnode = ctr;
  while (curnode) {
    curlen = nlen[curnode];
    if (curlen == maxlen) break;
    
    for (e = fstedge(curnode); e; e = nxtedge(e,curnode)) {
      other = e.head;
      if (other == curnode) other = e.tail;
      if (nlen[other]) continue; /* already seen */
      subnode(comp,other);
      nlen[other] = curlen+1;
      stk[eid++] = other;
    }

    if (sid < eid) curnode = stk[sid++];
    else curnode = NULL;
  }
  
  induce(comp);
  write(comp);
}

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