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fix(ui-new): keyboard letters were blank

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Since bf1e6fca kbApplyCapsUtf8 wanted 4 bytes free before each codepoint;
the ABC grid passes a 3-byte cell buffer, so every cell came out empty (T9
and CardKB Compact draw no such cells, so it went unnoticed). A codepoint
is now copied when it fits with the NUL.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-09-29 00:06:01 +02:00
co-authored by Claude Opus 5.5
parent 358f92222a
commit 4bda4f3a76
1 changed files with 8 additions and 2 deletions
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examples/companion_radio/ui-new/KeyboardWidget.h
+8 -2
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@@ -159,12 +159,18 @@ static const int KB_PREVIEW_BYTES = KB_PREVIEW_CAP * 2;
static void kbApplyCapsUtf8(const char* in, bool caps, char* out, size_t out_size) {
size_t o = 0;
const uint8_t* p = (const uint8_t*)in;
while (*p && o + 4 < out_size) {
while (*p) {
uint32_t cp = DisplayDriver::decodeCodepoint(p);
// Shared case table (ui-core/KeyboardData.h). ß stays ß here: its
// uppercase ẞ (U+1E9E) is outside the misc-fixed font's U+0020-04FF.
if (caps && cp != 0x00DF) cp = kbd::toUpper(cp);
o += kbd::encode(cp, out + o);
// Copied only if it fits with the NUL: a grid cell's buffer holds just one
// 2-byte letter, which a flat "4 bytes free" check left empty.
char enc[4];
size_t n = kbd::encode(cp, enc);
if (o + n >= out_size) break;
memcpy(out + o, enc, n);
o += n;
}
out[o] = '\0';
}