原程序由redhatpku提供，我改了查找ip部分
修改list.c，在deal_key里头增加
        case '/'://down search id. added by redhatpku 2002.4.29
                num=UseronlineSearch(num,1);
                break;
        case '?'://up search id .added by redhatpku 2002.4.29
                num=UseronlineSearch(num,-1);
                break;
同时增加如下函数
UseronlineSearch(curr_num,offset)
int curr_num;
int offset;
{
        static char method[2],queryID[IDLEN+2],queryIP[20],queryNick[NAMELEN+2];
        char ans[STRLEN+1], pmt[STRLEN];
        strcpy(ans, method);
        get_upper_str(ans,ans);
        sprintf(pmt,"查找方式:(A)ID(B)呢称(C)IP[%s]:",ans);
        move(t_lines - 1, 0);
        clrtoeol();
        getdata(t_lines - 1, 0,pmt, ans, 2, DOECHO, YEA);
        if(!(ans[0]>='A'&&ans[0]<='C'||ans[0]>='a'&&ans[0]<='c'||ans[0]=='\0'))
                return curr_num;
        if(ans[0]!='\0')strcpy(method, ans);
        switch(method[0]){
                case 'A':
                case 'a':
                        strcpy(ans, queryID);
                        sprintf(pmt, "搜寻%s的ID [%s]: ", offset > 0 ? "往后来"
: "往先前",ans);
                        move(t_lines - 1, 0);
                        clrtoeol();
                        getdata(t_lines - 1, 0, pmt, ans, IDLEN+1, DOECHO, YEA);
                        if (ans[0] != '\0')
                                strcpy(queryID, ans);
                        return IDSearch(queryID,curr_num,offset);
                case 'B':
                case 'b':
                        strcpy(ans, queryNick);
                        sprintf(pmt, "搜寻%s的呢称[%s]: ", offset > 0 ? "往后来"
: "往先前",ans);
                        move(t_lines - 1, 0);
                        clrtoeol();
                        getdata(t_lines - 1, 0, pmt, ans, NAMELEN+1, DOECHO, YEA
);
                        if (ans[0] != '\0')
                                strcpy(queryNick, ans);
                        return NickSearch(queryNick,curr_num,offset);
                case 'C':
                case 'c':
                        strcpy(ans, queryIP);
                        sprintf(pmt, "%s搜寻来自%s的ID: ", offset > 0 ? "往后来"
: "往先前",ans);
                        move(t_lines - 1, 0);
                        clrtoeol();
                        getdata(t_lines - 1, 0, pmt, ans, 17, DOECHO, YEA);
                        if (ans[0] != '\0')
                                strcpy(queryIP, ans);
                        
                        return IPSearch(queryIP,curr_num,offset);
                default :return curr_num;
        }
}
int
IDSearch(query,curr_num,offset)
char query[STRLEN];
int curr_num;
int offset;
{
        char upper_ID[IDLEN+2], upper_query[IDLEN+2];
        int i;
        get_upper_str(upper_query, query);
        if(query[0]=='\0')return curr_num;
        if(offset>0)
                {
                for (i=curr_num+1;i<range;i++)
                        {
                        get_upper_str(upper_ID, user_record[i]->userid);
                        if(!strncmp(upper_ID,upper_query,strlen(query)))
                                return i;
                        }
                }
        else if(offset<0)
                {
                for (i=curr_num-1;i>0;i--)
                        {
                        get_upper_str(upper_ID, user_record[i]->userid);
                        if(!strncmp(upper_ID,upper_query,strlen(query)))
                                return i;
                        }
                }
        return curr_num;
}
int
IPSearch(query,curr_num,offset)
char query[20];
int curr_num;
int offset;
{
        int i;
        if(query[0]=='\0')return curr_num;
        if(offset>0)
                {
                for (i=curr_num+1;i<range;i++)
                        {
                        //yanglc 20021102
                        if(!strncmp(user_record[i]->from,query,strlen(query)))
                                return i;
                        }
                }
        else if(offset<0)
                {
                for (i=curr_num-1;i>0;i--)
                        {
                        //yanglc 20021102
                        if(!strncmp(user_record[i]->from,query,strlen(query)))
                                return i;
                        }
                }
        return curr_num;
}

int
NickSearch(query,curr_num,offset)
char query[STRLEN];
int curr_num;
int offset;
{
        int i;
        if (query[0]=='\0')return curr_num;
       if(offset>0)
                {
                for (i=curr_num+1;i<range;i++)
                        {
                        if(!strncmp(user_record[i]->username,query,strlen(query)
))
                                return i;
                        }
                }
        else if(offset<0)
                {
                for (i=curr_num-1;i>0;i--)
                        {
                        if(!strncmp(user_record[i]->username,query,strlen(query)
))
                                return i;
                        }
                }
        return curr_num;
}
--
FROM 162.105.67.39