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Partial code improvements with respect to Clang 19 warnings #1516

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Partial code improvements with respect to Clang 19 warnings #1516

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2726d0e
Row_printNanoseconds() code portability improvements
Explorer09 Aug 11, 2024
677acbd
Use size_t for offsets in Text & Graph meter routines
Explorer09 Aug 13, 2024
3718c39
Use 'unsigned int' for Header column numbers
Explorer09 Aug 13, 2024
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31 changes: 19 additions & 12 deletions Meter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,16 +49,19 @@ static inline void Meter_displayBuffer(const Meter* this, RichString* out) {
/* ---------- TextMeterMode ---------- */

static void TextMeterMode_draw(Meter* this, int x, int y, int w) {
if (w <= 0)
return;

const char* caption = Meter_getCaption(this);
attrset(CRT_colors[METER_TEXT]);
mvaddnstr(y, x, caption, w);
attrset(CRT_colors[RESET_COLOR]);

int captionLen = strlen(caption);
x += captionLen;
w -= captionLen;
if (w <= 0)
size_t captionLen = strlen(caption);
if ((size_t)w <= captionLen)
return;
x += (int)captionLen;
w -= (int)captionLen;

RichString_begin(out);
Meter_displayBuffer(this, &out);
Expand Down Expand Up @@ -301,6 +304,10 @@ static void LEDMeterMode_drawDigit(int x, int y, int n) {
}

static void LEDMeterMode_draw(Meter* this, int x, int y, int w) {
assert(x >= 0);
if (w <= 0)
return;

#ifdef HAVE_LIBNCURSESW
if (CRT_utf8)
LEDMeterMode_digits = LEDMeterMode_digitsUtf8;
Expand All @@ -318,25 +325,25 @@ static void LEDMeterMode_draw(Meter* this, int x, int y, int w) {
y + 2;
attrset(CRT_colors[LED_COLOR]);
const char* caption = Meter_getCaption(this);
mvaddstr(yText, x, caption);
int xx = x + strlen(caption);
mvaddnstr(yText, x, caption, w);
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This one is a little beyond my knowledge. According to man pages, the n in mvaddnstr refers to number of "characters" to print. However, what I really want to limit is the number of terminal columns, not the number of Unicode characters (this distinction is needed if East Asian Wide characters are in the strings).

Perhaps a good way is to test how this function call would output, would it be "１２" or just "１":

/* "１２３４ fullwidth" */
addnstr("\uFF11\uFF12\uFF13\uFF14 fullwidth", 2);

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What about wcswidth(3)?

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What I wish is a function that does an inverse of wcswidth(3). wcswidth() returns the terminal column width given a string and a number of (Unicode) characters limit. What I wished is retrieving the number of characters (or number of bytes) given a string and a column width limit. RichString_appendnWideColumns() might give the closest I need, but I want a function that operates on a const char* rather than a RichString object. Maybe I would write one from scratch?

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Unfortunately that is easier said than actual done, but based on the fact that wcswidth returns >=0 you can probably build something like this by calling wcwidth(3) for each character in turn until you overshoot the limit, in which case you know the last character was too much (this accounts for zero-width-combiners and other special cases). The down-side is, that you will need to transform the const char* into wchar_t* first, thus having this functionality live with the other RichString functions might be reasonable.

NB: There's actually an issue that might benefit from this functionality in #462 IIRC.

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@BenBE Yes, I'm aware of PR #462. And perhaps PR #1231 can benefit, too, as I wish this function would work as a word wrapper that is also CJK-aware.

size_t xx = (size_t)x + strlen(caption);
int len = RichString_sizeVal(out);
for (int i = 0; i < len; i++) {
for (size_t i = 0; i < (size_t)len; i++) {
int c = RichString_getCharVal(out, i);
if (c >= '0' && c <= '9') {
if (xx - x + 4 > w)
if (xx + 4 > (unsigned int)x + (unsigned int)w)
break;

LEDMeterMode_drawDigit(xx, y, c - '0');
LEDMeterMode_drawDigit((int)xx, y, c - '0');
xx += 4;
} else {
if (xx - x + 1 > w)
if (xx + 1 > (unsigned int)x + (unsigned int)w)
break;
#ifdef HAVE_LIBNCURSESW
const cchar_t wc = { .chars = { c, '\0' }, .attr = 0 }; /* use LED_COLOR from attrset() */
mvadd_wch(yText, xx, &wc);
mvadd_wch(yText, (int)xx, &wc);
#else
mvaddch(yText, xx, c);
mvaddch(yText, (int)xx, c);
#endif
xx += 1;
}
Expand Down