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linux-user: Add proper error messages for bad options 

This patch adds better support for diagnosing option
parser errors.  The previous implementation just printed
the usage text and exited when a bad option or argument
was found.  This made it very difficult to determine why
the usage was being displayed and it was doubly confusing
for cases like '--help' (it wasn't clear that --help was
actually an error).

Signed-off-by: Meador Inge <meadori@codesourcery.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Meador Inge 2015-07-06 11:03:40 -07:00 committed by Riku Voipio
parent daaf8c8eb7
commit 138940bf08
1 changed files with 7 additions and 3 deletions
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10
linux-user/main.c
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@ -4029,7 +4029,9 @@ static int parse_args(int argc, char **argv)
if (!strcmp(r, arginfo->argv)) { if (!strcmp(r, arginfo->argv)) {
if (arginfo->has_arg) { if (arginfo->has_arg) {
if (optind >= argc) { if (optind >= argc) {
usage(1); (void) fprintf(stderr,
"qemu: missing argument for option '%s'\n", r);
exit(1);
} }
arginfo->handle_opt(argv[optind]); arginfo->handle_opt(argv[optind]);
optind++; optind++;
@ -4042,12 +4044,14 @@ static int parse_args(int argc, char **argv)
/* no option matched the current argv */ /* no option matched the current argv */
if (arginfo->handle_opt == NULL) { if (arginfo->handle_opt == NULL) {
usage(1); (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
exit(1);
} }
} }
if (optind >= argc) { if (optind >= argc) {
usage(1); (void) fprintf(stderr, "qemu: no user program specified\n");
exit(1);
} }
filename = argv[optind]; filename = argv[optind];