#include?<stdio.h>
#include?<stdlib.h>
#include?<string.h>
#define?MAX_LINE_LEN?1024
int?main()?{
????char?line[MAX_LINE_LEN];
????FILE?*in?=?fopen("/etc/passwd",?"r");
????if?(!in)?exit(EXIT_FAILURE);
????while?(fgets(line,?MAX_LINE_LEN,?in)?!=?NULL)?{
????????char?*sep?=?strchr(line,?':');
????????if?(!sep)?exit(EXIT_FAILURE);
????????*sep?=?'\0';
????????printf("%s\n",?line);
????}
????fclose(in);
????return?EXIT_SUCCESS;
}