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	last.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	last.c (1085B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <errno.h>
	3 #include <libgen.h>
	4 #include <paths.h>
	5 #include <pwd.h>
	6 #include <stdio.h>
	7 #include <stdlib.h>
	8 #include <string.h>
	9 #include <time.h>
	10 #include <utmp.h>
	11 #include <unistd.h>
	12
	13 #include "config.h"
	14 #include "util.h"
	15
	16 static void
	17 usage(void)
	18 {
	19 eprintf("usage: %s [user]\n", argv0);
	20 }
	21
	22 int
	23 main(int argc, char **argv)
	24 {
	25 FILE *fp;
	26 struct utmp ut;
	27 char user, file, *prog;
	28 time_t t;
	29
	30 ARGBEGIN {
	31 default:
	32 usage();
	33 } ARGEND;
	34
	35 switch (argc) {
	36 case 0:
	37 user = NULL;
	38 break;
	39 case 1:
	40 user = argv[0];
	41 break;
	42 default:
	43 usage();
	44 }
	45
	46 prog = basename(argv0);
	47 file = (!strcmp(prog, "last")) ? WTMP_PATH : BTMP_PATH;
	48 if ((fp = fopen(file, "r")) == NULL)
	49 eprintf("fopen %s:", file);
	50
	51 while (fread(&ut, sizeof(ut), 1, fp) == 1) {
	52 if (ut.ut_type != USER_PROCESS \|\|
	53 (user && strcmp(user, ut.ut_name))) {
	54 continue;
	55 }
	56
	57 t = ut.ut_time;
	58 printf("%-8.8s %-8.8s %-16.16s %s",
	59 ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t));
	60 }
	61 if (fclose(fp))
	62 eprintf("fclose %s:", file);
	63 return 0;
	64 }