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	who.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	who.c (1212B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <stdio.h>
	3 #include <stdlib.h>
	4 #include <string.h>
	5 #include <time.h>
	6 #include <unistd.h>
	7 #include <utmp.h>
	8
	9 #include "config.h"
	10 #include "util.h"
	11
	12 static void
	13 usage(void)
	14 {
	15 eprintf("usage: %s [-ml]\n", argv0);
	16 }
	17
	18 int
	19 main(int argc, char *argv[])
	20 {
	21 struct utmp usr;
	22 FILE *ufp;
	23 char timebuf[sizeof "yyyy-mm-dd hh:mm"];
	24 char tty, ttmp;
	25 int mflag = 0, lflag = 0;
	26 time_t t;
	27
	28 ARGBEGIN {
	29 case 'm':
	30 mflag = 1;
	31 tty = ttyname(0);
	32 if (!tty)
	33 eprintf("ttyname: stdin:");
	34 if ((ttmp = strrchr(tty, '/')))
	35 tty = ttmp+1;
	36 break;
	37 case 'l':
	38 lflag = 1;
	39 break;
	40 default:
	41 usage();
	42 } ARGEND;
	43
	44 if (argc > 0)
	45 usage();
	46
	47 if (!(ufp = fopen(UTMP_PATH, "r")))
	48 eprintf("fopen: %s:", UTMP_PATH);
	49
	50 while (fread(&usr, sizeof(usr), 1, ufp) == 1) {
	51 if (!usr.ut_name \|\| !usr.ut_line \|\|
	52 usr.ut_line[0] == '~')
	53 continue;
	54 if (mflag != 0 && strcmp(usr.ut_line, tty) != 0)
	55 continue;
	56 if (!!strcmp(usr.ut_name, "LOGIN") == lflag)
	57 continue;
	58 t = usr.ut_time;
	59 strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", loca…
	60 printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, t…
	61 }
	62 fclose(ufp);
	63 return 0;
	64 }