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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/cgtop/cgtop.c
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/cgtop/cgtop.c')
-rw-r--r--src/cgtop/cgtop.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/src/cgtop/cgtop.c b/src/cgtop/cgtop.c
index fd0023b0a8..509fe4cdc8 100644
--- a/src/cgtop/cgtop.c
+++ b/src/cgtop/cgtop.c
@@ -548,8 +548,7 @@ static int display(Hashmap *a) {
return 0;
}
-static int help(void) {
-
+static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Show top control groups by their resource usage.\n\n"
" -h --help Show this help\n"
@@ -563,10 +562,8 @@ static int help(void) {
" -d --delay=DELAY Delay between updates\n"
" -n --iterations=N Run for N iterations before exiting\n"
" -b --batch Run in batch mode, accepting no input\n"
- " --depth=DEPTH Maximum traversal depth (default: %u)\n",
- program_invocation_short_name, arg_depth);
-
- return 0;
+ " --depth=DEPTH Maximum traversal depth (default: %u)\n"
+ , program_invocation_short_name, arg_depth);
}
static int parse_argv(int argc, char *argv[]) {
@@ -594,12 +591,13 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 1);
assert(argv);
- while ((c = getopt_long(argc, argv, "hptcmin:bd:", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "hptcmin:bd:", options, NULL)) >= 0)
switch (c) {
case 'h':
- return help();
+ help();
+ return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
@@ -674,7 +672,6 @@ static int parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (optind < argc) {
log_error("Too many arguments.");