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, 4 insertions, 8 deletions

diff --git a/src/delta/delta.c b/src/delta/delta.c
index dd7523d473..cd8bd35716 100644
--- a/src/delta/delta.c
+++ b/src/delta/delta.c
@@ -473,18 +473,15 @@ static int process_suffix_chop(const char *arg) {
         return -EINVAL;
 }
 
-static int help(void) {
-
+static void help(void) {
         printf("%s [OPTIONS...] [SUFFIX...]\n\n"
                "Find overridden configuration files.\n\n"
                "  -h --help           Show this help\n"
                "     --version        Show package version\n"
                "     --no-pager       Do not pipe output into a pager\n"
                "     --diff[=1|0]     Show a diff when overridden files differ\n"
-               "  -t --type=LIST...   Only display a selected set of override types\n",
-               program_invocation_short_name);
-
-        return 0;
+               "  -t --type=LIST...   Only display a selected set of override types\n"
+               , program_invocation_short_name);
 }
 
 static int parse_flags(const char *flag_str, int flags) {
@@ -534,7 +531,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 1);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -585,7 +582,6 @@ static int parse_argv(int argc, char *argv[]) {
                 default:
                         assert_not_reached("Unhandled option");
                 }
-        }
 
         return 1;
 }