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, 12 insertions, 15 deletions

diff --git a/src/path/path.c b/src/path/path.c
index c2936e0bc..347921a07 100644
--- a/src/path/path.c
+++ b/src/path/path.c
@@ -77,18 +77,6 @@ static const char* const path_table[_SD_PATH_MAX] = {
         [SD_PATH_SEARCH_CONFIGURATION] = "search-configuration",
 };
 
-static int help(void) {
-
-        printf("%s [OPTIONS...] [NAME...]\n\n"
-               "Show system and user paths.\n\n"
-               "  -h --help             Show this help\n"
-               "     --version          Show package version\n"
-               "     --suffix=SUFFIX    Suffix to append to paths\n",
-               program_invocation_short_name);
-
-        return 0;
-}
-
 static int list_homes(void) {
         uint64_t i = 0;
         int r = 0;
@@ -135,6 +123,15 @@ static int print_home(const char *n) {
         return -ENOTSUP;
 }
 
+static void help(void) {
+        printf("%s [OPTIONS...] [NAME...]\n\n"
+               "Show system and user paths.\n\n"
+               "  -h --help             Show this help\n"
+               "     --version          Show package version\n"
+               "     --suffix=SUFFIX    Suffix to append to paths\n",
+               program_invocation_short_name);
+}
+
 static int parse_argv(int argc, char *argv[]) {
 
         enum {
@@ -154,12 +151,13 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 
                 switch (c) {
 
                 case 'h':
-                        return help();
+                        help();
+                        return 0;
 
                 case ARG_VERSION:
                         puts(PACKAGE_STRING);
@@ -176,7 +174,6 @@ static int parse_argv(int argc, char *argv[]) {
                 default:
                         assert_not_reached("Unhandled option");
                 }
-        }
 
         return 1;
 }