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	lastlog.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	lastlog.c (1555B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <errno.h>
	3 #include <paths.h>
	4 #include <pwd.h>
	5 #include <stdio.h>
	6 #include <stdlib.h>
	7 #include <string.h>
	8 #include <time.h>
	9 #include <utmp.h>
	10
	11 #include "text.h"
	12 #include "util.h"
	13
	14 #define PASSWD "/etc/passwd"
	15
	16 static FILE *last;
	17
	18 static void
	19 lastlog(char *user)
	20 {
	21 struct passwd *pwd;
	22 struct lastlog ll;
	23 time_t lltime;
	24
	25 errno = 0;
	26 if ((pwd = getpwnam(user)) == NULL) {
	27 if (errno)
	28 weprintf("getpwnam %s:", user);
	29 else
	30 weprintf("unknown user: %s\n", user);
	31 return;
	32 }
	33
	34 fseek(last, pwd->pw_uid * sizeof(struct lastlog), 0);
	35 fread(&ll, sizeof(struct lastlog), 1, last);
	36
	37 if (ferror(last))
	38 eprintf("%s: read error:", _PATH_LASTLOG);
	39
	40 /* on glibc `ll_time' can be an int32_t with compat32
	41 * avoid compiler warning when calling ctime() */
	42 lltime = ll.ll_time;
	43 printf("%-8.8s %-8.8s %-16.16s %s",
	44 user, ll.ll_line, ll.ll_host, ctime(&lltime));
	45 }
	46
	47 int
	48 main(int argc, char **argv)
	49 {
	50 FILE *fp;
	51 char line = NULL, p;
	52 size_t sz = 0;
	53
	54 if ((last = fopen(_PATH_LASTLOG, "r")) == NULL)
	55 eprintf("fopen %s:", _PATH_LASTLOG);
	56
	57 if (argc > 1) {
	58 while (*++argv)
	59 lastlog(*argv);
	60 } else {
	61 if ((fp = fopen(PASSWD, "r")) == NULL)
	62 eprintf("fopen %s:", PASSWD);
	63 while (agetline(&line, &sz, fp) != -1) {
	64 if ((p = strchr(line, ':')) == NULL)
	65 eprintf("invalid passwd entry\n");
	66 *p = '\0';
	67 lastlog(line);
	68 }
	69 if (fclose(fp))
	70 eprintf("fclose %s:", PASSWD);
	71 free(line);
	72 }
	73
	74 if (fclose(last))
	75 eprintf("fclose %s:", _PATH_LASTLOG);
	76
	77 return 0;
	78 }