參照之前名片檔多頁的寫法  和LinAndy在SOB版POST解決簽名檔的方法改了一下
不過因為敝站的簽名檔的編輯跟原本的SOB不太一樣(仿maple 3)
所以我改的部份只是用於寫信或發表文章時加簽名檔的部份  嗯嗯  :p
沒有最佳化  改的亂亂的  大家就test看看(這個寫法就是沒用到user.c的showsig..)
edit.c
addsig()
{
  FILE *fs;
  int i=0,j,m,n=0,k=0;
  char buf[WRAPMARGIN + 1];
  char buf1[256];
  char ans[3];
  char fpath[STRLEN];
  char ch;
  char sigch;
  char askmsg[100];
  static char msg[] = "請選擇簽名檔 (1-9, 0=不加)[0]:\n";
 if (!currutmp->userlevel)
     return;
  msg[27] = ch = '0' | (cuser.uflag & SIG_FLAG);
  /*chyiuan add*/
  clear();
  move(0,0);
  prints(msg);
  setuserfile(fpath, "sig.0");
  j = strlen(fpath) - 1;
  for (sigch = '1'; sigch <= '9'; sigch++)
  {
    fpath[j] = sigch;
    if (fs = fopen(fpath, "r"))
    { prints("【 簽名檔.%c 】\n", sigch);
      i++;
      for (m = 0; m++ < MAXSIGLINES && fgets(buf1, 256, fs); outs(buf1))
      {
        if (i++ == 21)
        {
          move(b_lines,0);
          outmsg("[SPACE]往下一頁繼續,[數字0～9]選擇簽名檔,[ENTER]使用設定");
          do{
             k = egetch();
          }while(k!='0'&&k!='1'&&k!='2'&&k!='3'&&k!='4'&&k!='5'&&k!='6'&&k!='7'
            && k!='8'&& k!='9'&& k!='\r'&& k!='\n'&&k!=' ');

          if (k=='0'||k=='1'||k=='2'||k=='3'||k=='4'||k=='5'||k=='6'||k=='7'
              ||k=='8'||k=='9')
          {
            sprintf(askmsg,"你確定要使用第%d個簽名檔嗎?[y/n]:",k-48);
            getdata(0,0,askmsg,ans,3,DOECHO,0);
            if(ans[0]!='n' && ans[0]!='N')
              {
                 buf[0]=k;
              }
            else
              {
                 buf[0]=ch;
              }
            sigch='9';
            n=1;
            clear();
          }
          else if (k=='\n' || k=='\r')
          {
            sprintf(askmsg,"使用原先設定的簽名檔[%d]",ch-48);
            pressanykey1(askmsg);
            buf[0]=ch;
            n=1;
            clear();
          }

          else
          {
           clear();
           move(0,0);
           prints(msg);
           move(2,0);
           i=1;
          }
        }
      }
      fclose(fs);
     }
   }
  if(n!=1)
  {
    move(b_lines,0);
    outmsg("[數字0～9]決定使用簽名檔, 或[Enter]使用原先設定的");

    do{
        k = egetch();
    }while(k!='0'&&k!='1'&&k!='2'&&k!='3'&&k!='4'&&k!='5'&&k!='6'&&k!='7'
       && k!='8'&& k!='9'&&k!='\n'&&k!='\r');
    if(k=='\r'||k=='\n')
    {
     sprintf(askmsg,"使用原先設定的簽名檔[%d]",ch-48);
     pressanykey1(askmsg);
     buf[0]=ch;
    }
    else if (k=='0'||k=='1'||k=='2'||k=='3'||k=='4'||k=='5'||k=='6'||k=='7'
           ||k=='8'||k=='9')
    {
     sprintf(askmsg,"你確定要使用第%d個簽名檔嗎?[y/n]:",k-48);
     getdata(0,0,askmsg,ans,3,DOECHO,0);
     if(ans[0]!='n' && ans[0]!='N')
     {
       buf[0]=k ;
     }
     else
     {
       buf[0]=ch;
     }
    }
  }

  i=j;

  if (ch != buf[0] && buf[0] >= '0' && buf[0] <= '9')
  {
    ch = buf[0];
    cuser.uflag = (cuser.uflag & ~SIG_FLAG) | (ch & SIG_FLAG);
  }


  if (ch != '0') {
    fpath[i] = ch;
    if (fs = fopen(fpath, "r"))
    {
      insert_string("\n--\n");
      for (i = 0; i < MAXSIGLINES && fgets(buf, sizeof(buf), fs); i++)
        insert_string(buf);
      fclose(fs);
    }
  }
}