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J. Nick Koston
2025-12-19 10:49:19 -10:00
parent 4464e464b6
commit 04eb64f361
1 changed files with 4 additions and 1 deletions
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5
esphome/components/web_server/web_server.cpp
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@@ -434,7 +434,10 @@ static void set_json_icon_state_value(JsonObject &root, EntityBase *obj, const c
root[ESPHOME_F("state")] = state;
}
// Macros for stack-based value formatting (avoid heap allocation)
// Macros for stack-based value formatting (avoid heap allocation).
// Usage: Declare VALUE_BUF once per scope, then use VALUE_OR_NA/VALUE_UOM_OR_NA.
// Safe because ArduinoJson copies the string immediately on assignment.
// Note: Do NOT use multiple macros in the same expression - use separate statements.
#define VALUE_BUF char _vbuf_[VALUE_ACCURACY_MAX_LEN]
#define VALUE_OR_NA(value, decimals) \
(std::isnan(value) ? "NA" : (value_accuracy_to_buf(_vbuf_, value, decimals), _vbuf_))