#include <stdio.h>
#include <string.h>

int main(void)
{
    FILE *fp;  int i;
    char name[256], buf[1024], *ip, *hostname, *etc;

    for (;;) {
        printf("--- Hostname(. for quit): ");
        if (scanf("%255s", name) != 1 || name[0] == '.') break;
        fp = fopen("testfile", "r");
        if (fp == NULL) return 1;
        while (fgets(buf, sizeof buf, fp)) {
            ip = strtok(buf, " \t\n");
            if (ip == NULL) continue;
            hostname = strtok(NULL, " \t\n");
            if (hostname == NULL || strcmp(name, hostname)) continue;
            printf("IP:%s\nHostname:%s\n", ip, hostname);
            for (i = 1; etc = strtok(NULL, " \t\n"); i++)
                printf("etc%d:%s\n", i, etc);
        }
        fclose(fp);
    }
    return 0;
}