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[lvgl] Use stack buffer for event code formatting, document justified str_sprintf usage (#13220)

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Co-authored-by: Clyde Stubbs <2366188+clydebarrow@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2026-01-14 15:24:42 -10:00
committed by GitHub
parent f1e5d3a39a
commit 03f3deff41
2 changed files with 5 additions and 1 deletions
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esphome/components/lvgl/lv_validation.py
+1
View File
@@ -413,6 +413,7 @@ class TextValidator(LValidator):
str_args = [str(x) for x in value[CONF_ARGS]] str_args = [str(x) for x in value[CONF_ARGS]]
arg_expr = cg.RawExpression(",".join(str_args)) arg_expr = cg.RawExpression(",".join(str_args))
format_str = cpp_string_escape(format_str) format_str = cpp_string_escape(format_str)
# str_sprintf justified: user-defined format, can't optimize without permanent RAM cost
sprintf_str = f"str_sprintf({format_str}, {arg_expr}).c_str()" sprintf_str = f"str_sprintf({format_str}, {arg_expr}).c_str()"
if nanval := value.get(CONF_IF_NAN): if nanval := value.get(CONF_IF_NAN):
nanval = cpp_string_escape(nanval) nanval = cpp_string_escape(nanval)
esphome/components/lvgl/lvgl_esphome.cpp
+4 -1
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@@ -65,7 +65,10 @@ std::string lv_event_code_name_for(uint8_t event_code) {
if (event_code < sizeof(EVENT_NAMES) / sizeof(EVENT_NAMES[0])) { if (event_code < sizeof(EVENT_NAMES) / sizeof(EVENT_NAMES[0])) {
return EVENT_NAMES[event_code]; return EVENT_NAMES[event_code];
} }
return str_sprintf("%2d", event_code); // max 4 bytes: "%u" with uint8_t (max 255, 3 digits) + null
char buf[4];
snprintf(buf, sizeof(buf), "%u", event_code);
return buf;
} }
static void rounder_cb(lv_disp_drv_t *disp_drv, lv_area_t *area) { static void rounder_cb(lv_disp_drv_t *disp_drv, lv_area_t *area) {