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Implement -m for who

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sin 2013-08-05 15:59:49 +01:00 committed by David Galos
parent 9e5718282a
commit d59c8eea36
1 changed files with 15 additions and 3 deletions
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18
who.c
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@ -1,6 +1,7 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <stdbool.h>
#include <unistd.h> #include <unistd.h>
#include <time.h> #include <time.h>
#include <utmp.h> #include <utmp.h>
@ -15,8 +16,17 @@ main(int argc, char **argv)
FILE *ufp; FILE *ufp;
time_t t; time_t t;
char timebuf[sizeof "yyyy-mm-dd hh:mm"]; char timebuf[sizeof "yyyy-mm-dd hh:mm"];
bool mflag = false;
if(argc!=1) ARGBEGIN {
case 'm':
mflag = true;
break;
default:
usage();
} ARGEND;
if (argc > 0)
usage(); usage();
if (!(ufp = fopen(_PATH_UTMP, "r"))) { if (!(ufp = fopen(_PATH_UTMP, "r"))) {
@ -25,6 +35,9 @@ main(int argc, char **argv)
while(fread((char *)&usr, sizeof(usr), 1, ufp) == 1) { while(fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
if (!*usr.ut_name || !*usr.ut_line) if (!*usr.ut_name || !*usr.ut_line)
continue; continue;
if (mflag && strcmp(usr.ut_line,
strrchr(ttyname(STDIN_FILENO), '/') + 1))
continue;
t = usr.ut_time; t = usr.ut_time;
strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t)); strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, timebuf); printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, timebuf);
@ -36,6 +49,5 @@ main(int argc, char **argv)
void void
usage(void) usage(void)
{ {
eprintf("usage: who\n"); eprintf("usage: who [-m]\n");
} }