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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-02 11:12:21 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-03 21:46:07 -0400
commit601185b43da638b1c74153deae01dbd518680889 (patch)
treeb4f1bc609e57e542a03ca00553098eabbb3b196b /src/detect-virt
parent75cd513ef830d8e00d0d2d6a64917fec533315db (diff)
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.
Diffstat (limited to 'src/detect-virt')
-rw-r--r--src/detect-virt/detect-virt.c18
1 files changed, 8 insertions, 10 deletions
diff --git a/src/detect-virt/detect-virt.c b/src/detect-virt/detect-virt.c
index 8cf8dcfabc..ff5bee56f9 100644
--- a/src/detect-virt/detect-virt.c
+++ b/src/detect-virt/detect-virt.c
@@ -36,18 +36,15 @@ static enum {
ONLY_CONTAINER
} arg_mode = ANY_VIRTUALIZATION;
-static int help(void) {
-
+static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Detect execution in a virtualized environment.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -c --container Only detect whether we are run in a container\n"
" -v --vm Only detect whether we are run in a VM\n"
- " -q --quiet Don't output anything, just set return value\n",
- program_invocation_short_name);
-
- return 0;
+ " -q --quiet Don't output anything, just set return value\n"
+ , program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
@@ -70,12 +67,13 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "hqcv", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "hqcv", options, NULL)) >= 0)
switch (c) {
case 'h':
- return help();
+ help();
+ return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
@@ -100,10 +98,10 @@ static int parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (optind < argc) {
- help();
+ log_error("%s takes no arguments.",
+ program_invocation_short_name);
return -EINVAL;
}