[hackers] [ubase] Convert lastlog(8) to {w,}eprintf() || sin

[git]

commit 1aaec6250a5ca8949e30147259f9316d87eb93b5
Author: sin <s...@2f30.org>
Date:   Mon Aug 18 21:55:38 2014 +0100

    Convert lastlog(8) to {w,}eprintf()

diff --git a/lastlog.c b/lastlog.c
index 0c3cefa..1a27ae4 100644
--- a/lastlog.c
+++ b/lastlog.c
@@ -1,4 +1,5 @@
 /* See LICENSE file for copyright and license details. */
+#include <errno.h>
 #include <paths.h>
 #include <pwd.h>
 #include <stdio.h>
@@ -7,6 +8,8 @@
 #include <time.h>
 #include <utmp.h>
 
+#include "util.h"
+
 #define PASSWD   "/etc/passwd"
 
 static FILE *last;
@@ -18,18 +21,20 @@ lastlog(char *user)
        struct lastlog ll;
        time_t lltime;
 
+       errno = 0;
        if ((pwd = getpwnam(user)) == NULL) {
-               fprintf(stderr, "unknown user: %s
", user);
+               if (errno)
+                       weprintf("getpwnam %s:", user);
+               else
+                       weprintf("unknown user: %s
", user);
                return;
        }
 
        fseek(last, pwd->pw_uid * sizeof(struct lastlog), 0);
        fread(&ll, sizeof(struct lastlog), 1, last);
 
-       if (ferror(last)) {
-               perror("error reading lastlog");
-               exit(EXIT_FAILURE);
-       }
+       if (ferror(last))
+               eprintf("error reading lastlog
");
 
        /* on glibc `ll_time' can be an int32_t with compat32
         * avoid compiler warning when calling ctime() */
@@ -44,29 +49,23 @@ main(int argc, char **argv)
        FILE *fp;
        char line[512], *p;
 
-       if ((last = fopen(_PATH_LASTLOG, "r")) == NULL) {
-           perror(_PATH_LASTLOG);
-           exit(EXIT_FAILURE);
-       }
+       if ((last = fopen(_PATH_LASTLOG, "r")) == NULL)
+               eprintf("fopen %s:", _PATH_LASTLOG);
 
        if (argc > 1) {
                while (*++argv)
                        lastlog(*argv);
        } else {
-               if ((fp = fopen(PASSWD, "r")) == NULL) {
-                       perror(PASSWD);
-                       exit(EXIT_FAILURE);
-               }
+               if ((fp = fopen(PASSWD, "r")) == NULL)
+                       eprintf("fopen %s:", PASSWD);
                while ((fgets(line, sizeof(line), fp)) != NULL) {
-                       if ((p = strchr(line, ':')) == NULL) {
-                               fputs("incorrect password file", stderr);
-                               exit(-1);
-                       }
+                       if ((p = strchr(line, ':')) == NULL)
+                               eprintf("invalid passwd entry
");
                        *p = '