From c8057f951d64de93bfd01569c0a725baa9f94372 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 2 Aug 2012 13:45:54 +0100 Subject: Support 'help' as a synonym for '?' in command line options For command line options which permit '?' meaning 'please list the permitted values', add support for 'help' as a synonym, by abstracting the check out into a helper function. This change means that in some cases where we were being lazy in our string parsing, "?junk" will now be rejected as an invalid option rather than being (undocumentedly) treated the same way as "?". Update the documentation to use 'help' rather than '?', since '?' is a shell metacharacter and thus prone to fail confusingly if there is a single character filename in the current working directory and the '?' has not been escaped. It's therefore better to steer users towards 'help', though '?' is retained for backwards compatibility. We do not, however, update the output of the system emulator's -help (or any documentation autogenerated from the qemu-options.hx which is the source of the -help text) because libvirt parses our -help output and will break. At a later date when QEMU provides a better interface so libvirt can avoid having to do this, we can update the -help text too. Signed-off-by: Peter Maydell Signed-off-by: Anthony Liguori --- arch_init.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch_init.c') diff --git a/arch_init.c b/arch_init.c index 26f30ef987..60823baabd 100644 --- a/arch_init.c +++ b/arch_init.c @@ -680,7 +680,7 @@ void select_soundhw(const char *optarg) { struct soundhw *c; - if (*optarg == '?') { + if (is_help_option(optarg)) { show_valid_cards: printf("Valid sound card names (comma separated):\n"); @@ -688,7 +688,7 @@ void select_soundhw(const char *optarg) printf ("%-11s %s\n", c->name, c->descr); } printf("\n-soundhw all will enable all of the above\n"); - exit(*optarg != '?'); + exit(!is_help_option(optarg)); } else { size_t l; -- cgit v1.2.3