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[web_server] Replace str_sprintf with stack buffers

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This commit is contained in:
J. Nick Koston
2025-12-20 10:39:19 -10:00
parent 6c2d255230
commit de3e72af04
2 changed files with 13 additions and 6 deletions
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esphome/components/web_server/web_server.cpp
+10 -4
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@@ -1042,7 +1042,9 @@ std::string WebServer::date_json(datetime::DateEntity *obj, JsonDetail start_con
json::JsonBuilder builder;
JsonObject root = builder.root();
std::string value = str_sprintf("%d-%02d-%02d", obj->year, obj->month, obj->day);
// Format: YYYY-MM-DD (max 10 chars + null)
char value[12];
snprintf(value, sizeof(value), "%d-%02d-%02d", obj->year, obj->month, obj->day);
set_json_icon_state_value(root, obj, "date", value, value, start_config);
if (start_config == DETAIL_ALL) {
this->add_sorting_info_(root, obj);
@@ -1098,7 +1100,9 @@ std::string WebServer::time_json(datetime::TimeEntity *obj, JsonDetail start_con
json::JsonBuilder builder;
JsonObject root = builder.root();
std::string value = str_sprintf("%02d:%02d:%02d", obj->hour, obj->minute, obj->second);
// Format: HH:MM:SS (8 chars + null)
char value[12];
snprintf(value, sizeof(value), "%02d:%02d:%02d", obj->hour, obj->minute, obj->second);
set_json_icon_state_value(root, obj, "time", value, value, start_config);
if (start_config == DETAIL_ALL) {
this->add_sorting_info_(root, obj);
@@ -1154,8 +1158,10 @@ std::string WebServer::datetime_json(datetime::DateTimeEntity *obj, JsonDetail s
json::JsonBuilder builder;
JsonObject root = builder.root();
std::string value =
str_sprintf("%d-%02d-%02d %02d:%02d:%02d", obj->year, obj->month, obj->day, obj->hour, obj->minute, obj->second);
// Format: YYYY-MM-DD HH:MM:SS (max 19 chars + null)
char value[24];
snprintf(value, sizeof(value), "%d-%02d-%02d %02d:%02d:%02d", obj->year, obj->month, obj->day, obj->hour, obj->minute,
obj->second);
set_json_icon_state_value(root, obj, "datetime", value, value, start_config);
if (start_config == DETAIL_ALL) {
this->add_sorting_info_(root, obj);