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setsys_settings_items: Less resource churn with combined key/value construction

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The previous string construction discards two temporary std::string
instances (operator+ returns by value, not by reference), and creates a
std::string that it doesn't need to (the one around key). Instead we can
just append to the end of the initial std::string itself, saving on two
unnecessary created strings.

append() has a const char* overload as well (as does operator+), so we
can just append the key string as is without creating an entire new
string.
This commit is contained in:
Lioncash 2019-06-03 20:57:52 -04:00
parent 452c61db7a
commit dd10547ac2
1 changed files with 10 additions and 10 deletions
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20
stratosphere/ams_mitm/source/set_mitm/setsys_settings_items.cpp
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@ -153,8 +153,8 @@ static Result ParseValue(const char *name, const char *key, const char *val_tup)
if (delimiter == NULL || value_len == 0 || type_len == 0) {
return ResultSettingsItemValueInvalidFormat;
}
std::string kv = std::string(name) + "!" + std::string(key);
std::string kv = std::string(name).append("!").append(key);
SettingsItemValue value;
if (strncasecmp(type, "str", type_len) == 0 || strncasecmp(type, "string", type_len) == 0) {
@ -242,7 +242,7 @@ static int SettingsItemIniHandler(void *user, const char *name, const char *key,
return R_SUCCEEDED(rc) ? 1 : 0;
}
void SettingsItemManager::LoadConfiguration() {
void SettingsItemManager::LoadConfiguration() {
/* Open file. */
FsFile config_file;
Result rc = Utils::OpenSdFile("/atmosphere/system_settings.ini", FS_OPEN_READ, &config_file);
@ -275,31 +275,31 @@ void SettingsItemManager::LoadConfiguration() {
}
Result SettingsItemManager::GetValueSize(const char *name, const char *key, u64 *out_size) {
std::string kv = std::string(name) + "!" + std::string(key);
const std::string kv = std::string(name).append("!").append(key);
auto it = g_settings_items.find(kv);
if (it == g_settings_items.end()) {
return ResultSettingsItemNotFound;
}
*out_size = it->second.size;
return ResultSuccess;
}
Result SettingsItemManager::GetValue(const char *name, const char *key, void *out, size_t max_size, u64 *out_size) {
std::string kv = std::string(name) + "!" + std::string(key);
const std::string kv = std::string(name).append("!").append(key);
auto it = g_settings_items.find(kv);
if (it == g_settings_items.end()) {
return ResultSettingsItemNotFound;
}
size_t copy_size = it->second.size;
if (max_size < copy_size) {
copy_size = max_size;
}
*out_size = copy_size;
memcpy(out, it->second.data, copy_size);
return ResultSuccess;
}