libbb: make '--help' handling more consistent
Running an applet with '--help' as its only argument is treated
as a special case. If additional arguments follow '--help' the
behaviour is inconsistent:
- applets which call single_argv() print help and do nothing else;
- applets which call getopt() report "unrecognized option '--help'"
and print help anyway;
- expr says "expr: syntax error" and doesn't print help;
- printenv silently ignores '--help', prints any other variables
and doesn't print help;
- realpath says "--help: No such file or directory", prints the path
of any other files and doesn't print help.
If the first argument is '--help' ignore any other arguments and print
help. This is more consistent and most likely what the user wanted.
See also commit 6bdfbc4cb
(libbb: fix '--help' handling in
FEATURE_SH_NOFORK=y).
function old new delta
show_usage_if_dash_dash_help 75 69 -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-6) Total: -6 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
parent
41d5f800a1
commit
5a9d2b6e02
@ -258,7 +258,6 @@ void lbb_prepare(const char *applet
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/* Redundant for busybox (run_applet_and_exit covers that case)
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* but needed for "individual applet" mode */
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if (argv[1]
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&& !argv[2]
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&& strcmp(argv[1], "--help") == 0
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&& !is_prefixed_with(applet, "busybox")
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) {
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@ -940,8 +939,8 @@ void FAST_FUNC show_usage_if_dash_dash_help(int applet_no, char **argv)
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&& applet_no != APPLET_NO_echo
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# endif
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) {
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if (argv[1] && !argv[2] && strcmp(argv[1], "--help") == 0) {
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/* Make "foo --help" exit with 0: */
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if (argv[1] && strcmp(argv[1], "--help") == 0) {
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/* Make "foo --help [...]" exit with 0: */
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xfunc_error_retval = 0;
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bb_show_usage();
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}
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