/* ECP: FILEname=fig12_17.c */
/* 1*/   #include <stdio.h>
/* 2*/   #include <utmp.h>
/* 3*/   #include <time.h>

/* 4*/   static const char *Wtmp = "/var/adm/wtmp";
/* 5*/   static const UtmpSize = sizeof( struct utmp );

/* 6*/   #define NameLen       8
/* 7*/   #define LineLen       8

/* 8*/   int
/* 9*/   Logins( const char *SearchName )
/*10*/   {
/*11*/       int HowMany = 0;
/*12*/       struct utmp UtEntry;
/*13*/       FILE *Ufp;

/*14*/       if( ( Ufp = fopen( Wtmp, "rb" ) ) == NULL )
/*15*/       {
/*16*/           fprintf( stderr, "Can not open %s\n", Wtmp );
/*17*/           return -1;
/*18*/       }

/*19*/       fseek( Ufp, -UtmpSize, SEEK_END );
/*20*/       while( fread( &UtEntry, UtmpSize, 1, Ufp ) == 1 )
/*21*/       {
/*22*/           char Name[ NameLen + 1 ] = "", Line[ LineLen + 1 ] = "";

/*23*/           if( !strncmp( UtEntry.ut_name, SearchName, NameLen ) )
/*24*/           {
/*25*/               strncpy( Name, UtEntry.ut_name, NameLen );
/*26*/               strncpy( Line, UtEntry.ut_line, LineLen );
/*27*/               printf( "%-*s %-*s %26s", NameLen, Name, LineLen,
/*28*/                           Line, ctime( &UtEntry.ut_time ) );
/*29*/               HowMany++;
/*30*/           }
/*31*/               /* Back Up Past Current Structure */
/*32*/           if( fseek( Ufp, -UtmpSize * 2, SEEK_CUR ) == -1 )
/*33*/               break;
/*34*/       }

/*35*/       fclose( Ufp );
/*36*/       return HowMany;
/*37*/   }