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[PATCH 1/2] qemu-option: move help handling to get_opt_name_value
From: |
Paolo Bonzini |
Subject: |
[PATCH 1/2] qemu-option: move help handling to get_opt_name_value |
Date: |
Thu, 5 Nov 2020 09:27:30 -0500 |
Right now, help options are parsed normally and then checked
specially in opt_validate. but only if coming from
qemu_opts_parse or qemu_opts_parse_noisily.
Move the check from opt_validate to the common workhorses
of qemu_opts_parse and qemu_opts_parse_noisily, opts_do_parse
and get_opt_name_value.
As a result, opts_parse and opts_do_parse do not return an error anymore
when help is requested---just like qemu_opts_parse_noisily.
This will come in handy in the next patch, which will
raise a warning for "-object memory-backend-ram,share"
("flag" option with no =on/=off part) but not for
"-object memory-backend-ram,help".
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
util/qemu-option.c | 40 ++++++++++++++++++++--------------------
1 file changed, 20 insertions(+), 20 deletions(-)
diff --git a/util/qemu-option.c b/util/qemu-option.c
index acefbc23fa..61fc96f9dd 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -504,17 +504,13 @@ static QemuOpt *opt_create(QemuOpts *opts, const char
*name, char *value,
return opt;
}
-static bool opt_validate(QemuOpt *opt, bool *help_wanted,
- Error **errp)
+static bool opt_validate(QemuOpt *opt, Error **errp)
{
const QemuOptDesc *desc;
desc = find_desc_by_name(opt->opts->list->desc, opt->name);
if (!desc && !opts_accepts_any(opt->opts)) {
error_setg(errp, QERR_INVALID_PARAMETER, opt->name);
- if (help_wanted && is_help_option(opt->name)) {
- *help_wanted = true;
- }
return false;
}
@@ -531,7 +527,7 @@ bool qemu_opt_set(QemuOpts *opts, const char *name, const
char *value,
{
QemuOpt *opt = opt_create(opts, name, g_strdup(value), false);
- if (!opt_validate(opt, NULL, errp)) {
+ if (!opt_validate(opt, errp)) {
qemu_opt_del(opt);
return false;
}
@@ -767,16 +763,18 @@ void qemu_opts_print(QemuOpts *opts, const char
*separator)
static const char *get_opt_name_value(const char *params,
const char *firstname,
+ bool *help_wanted,
char **name, char **value)
{
- const char *p, *pe, *pc;
-
- pe = strchr(params, '=');
- pc = strchr(params, ',');
+ const char *p;
+ size_t len;
- if (!pe || (pc && pc < pe)) {
+ len = strcspn(params, "=,");
+ if (params[len] != '=') {
/* found "foo,more" */
- if (firstname) {
+ if (help_wanted && starts_with_help_option(params) == len) {
+ *help_wanted = true;
+ } else if (firstname) {
/* implicitly named first option */
*name = g_strdup(firstname);
p = get_opt_value(params, value);
@@ -814,7 +812,10 @@ static bool opts_do_parse(QemuOpts *opts, const char
*params,
QemuOpt *opt;
for (p = params; *p;) {
- p = get_opt_name_value(p, firstname, &option, &value);
+ p = get_opt_name_value(p, firstname, help_wanted, &option, &value);
+ if (help_wanted && *help_wanted) {
+ return false;
+ }
firstname = NULL;
if (!strcmp(option, "id")) {
@@ -825,7 +826,7 @@ static bool opts_do_parse(QemuOpts *opts, const char
*params,
opt = opt_create(opts, option, value, prepend);
g_free(option);
- if (!opt_validate(opt, help_wanted, errp)) {
+ if (!opt_validate(opt, errp)) {
qemu_opt_del(opt);
return false;
}
@@ -840,7 +841,7 @@ static char *opts_parse_id(const char *params)
char *name, *value;
for (p = params; *p;) {
- p = get_opt_name_value(p, NULL, &name, &value);
+ p = get_opt_name_value(p, NULL, NULL, &name, &value);
if (!strcmp(name, "id")) {
g_free(name);
return value;
@@ -856,11 +857,10 @@ bool has_help_option(const char *params)
{
const char *p;
char *name, *value;
- bool ret;
+ bool ret = false;
for (p = params; *p;) {
- p = get_opt_name_value(p, NULL, &name, &value);
- ret = is_help_option(name);
+ p = get_opt_name_value(p, NULL, &ret, &name, &value);
g_free(name);
g_free(value);
if (ret) {
@@ -946,10 +946,10 @@ QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list,
const char *params,
bool help_wanted = false;
opts = opts_parse(list, params, permit_abbrev, false, &help_wanted, &err);
- if (err) {
+ if (!opts) {
+ assert(!!err + !!help_wanted == 1);
if (help_wanted) {
qemu_opts_print_help(list, true);
- error_free(err);
} else {
error_report_err(err);
}
--
2.26.2