[hackers] [sbase] Audit logname(1) || FRIGN

[git]

commit 683d108387cb8e7ac7fdaa03fab77b41a8ba5d44
Author: FRIGN <d...@frign.de>
Date:   Tue Mar 17 00:44:18 2015 +0100

    Audit logname(1)
    
    1) Add usage().
    2) Idiomatic argv0-setter. We don't use arg.h, as we do not process
       flags or arguments.
    3) Remove program-name from eprintf-call. This is done in the eprintf-
       function itself when the DEBUG-define is set.
       We'll activate it by default later.
    4) Add empty line before return.

diff --git a/README b/README
index ecace49..c936841 100644
--- a/README
+++ b/README
@@ -41,7 +41,7 @@ The following tools are implemented ('*' == finished, '#' == 
UTF-8 support,
 =*| link            yes                          none
 =*| ln              yes                          none
 =*| logger          yes                          none
-=*  logname         yes                          none
+=*| logname         yes                          none
 =   ls              no                           (-C), -S, -f, -m, -s, -x
 =*| md5sum          non-posix                    none
 =*| mkdir           yes                          none
diff --git a/logname.c b/logname.c
index f1981a5..11d287b 100644
--- a/logname.c
+++ b/logname.c
@@ -4,17 +4,26 @@
 
 #include "util.h"
 
+static void
+usage(void)
+{
+       eprintf("usage: %s\n", argv0);
+}
+
 int
 main(int argc, char *argv[])
 {
        char *login;
 
-       argv0 = argv[0];
-       if (argc != 1)
-               eprintf("usage: %s\n", argv0);
+       argv0 = argv[0], argc--, argv++;
+
+       if (argc)
+               usage();
+
        if ((login = getlogin()))
                puts(login);
        else
-               eprintf("%s: no login name\n", argv0);
+               eprintf("no login name\n");
+
        return 0;
 }