Unify parse_argv style

getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.

When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.

Also, simplify things here and there.

1 files changed, 14 insertions, 8 deletions

diff --git a/src/test/test-libudev.c b/src/test/test-libudev.c
index f5c8bc768d..912b61396a 100644
--- a/src/test/test-libudev.c
+++ b/src/test/test-libudev.c
@@ -1,3 +1,4 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 /***
   This file is part of systemd.
 
@@ -423,6 +424,7 @@ int main(int argc, char *argv[]) {
         const char *syspath = "/devices/virtual/mem/null";
         const char *subsystem = NULL;
         char path[1024];
+        int c;
 
         udev = udev_new();
         printf("context: %p\n", udev);
@@ -433,34 +435,38 @@ int main(int argc, char *argv[]) {
         udev_set_log_fn(udev, log_fn);
         printf("set log: %p\n", log_fn);
 
-        for (;;) {
-                int option;
 
-                option = getopt_long(argc, argv, "+p:s:dhV", options, NULL);
-                if (option == -1)
-                        break;
+        while ((c = getopt_long(argc, argv, "p:s:dhV", options, NULL)) >= 0)
+                switch (c) {
 
-                switch (option) {
                 case 'p':
                         syspath = optarg;
                         break;
+
                 case 's':
                         subsystem = optarg;
                         break;
+
                 case 'd':
                         if (udev_get_log_priority(udev) < LOG_INFO)
                                 udev_set_log_priority(udev, LOG_INFO);
                         break;
+
                 case 'h':
                         printf("--debug --syspath= --subsystem= --help\n");
                         goto out;
+
                 case 'V':
                         printf("%s\n", VERSION);
                         goto out;
-                default:
+
+                case '?':
                         goto out;
+
+                default:
+                        assert_not_reached("Unhandled option code.");
                 }
-        }
+
 
         /* add sys path if needed */
         if (!startswith(syspath, "/sys")) {