minix/commands/who/who.c

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2005-04-21 16:53:53 +02:00
/* who 1.5 - tell who is currently logged in Author: Kees J. Bot
* 9 Jul 1989
*/
#define nil 0
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <utmp.h>
#include <time.h>
#include <string.h>
#include <paths.h>
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char PATH_UTMP[] = _PATH_UTMP;
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char day[] = "SunMonTueWedThuFriSat";
char month[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
int main(int argc, char **argv)
{
char *tmp= PATH_UTMP;
FILE *f;
struct utmp ut;
struct tm *tm;
int slot, wtmp= 0, once= 0;
if (argc > 3) {
fprintf(stderr, "Usage: who <account-file> | who am i\n");
exit(1);
}
if (argc == 2) {
tmp= argv[1];
wtmp= 1;
}
if ((f= fopen(tmp, "r")) == nil) {
fprintf(stderr, "who: can't open %s\n", tmp);
exit(1);
}
if (argc == 3) {
if ((slot= ttyslot()) < 0) {
fprintf(stderr, "who: no access to terminal.\n");
exit(1);
}
fseek(f, (off_t) sizeof(ut) * slot, 0);
once= 1;
}
while (fread((char *) &ut, sizeof(ut), 1, f) == 1) {
if (!wtmp && ut.ut_name[0] == 0) continue;
tm= localtime(&ut.ut_time);
printf("%-9.8s %-9.8s %.3s %.3s %2d %02d:%02d",
ut.ut_name,
ut.ut_line,
day + (3 * tm->tm_wday),
month + (3 * tm->tm_mon),
tm->tm_mday,
tm->tm_hour,
tm->tm_min
);
if (ut.ut_host[0] != 0) printf(" (%.*s)",
(int) sizeof(ut.ut_host), ut.ut_host);
printf("\n");
if (once) break;
}
exit(0);
}