Function utf8_ish_width

diff.c:2942–2951

* Like utf8_width(), but guaranteed safe for use in loops that subtract * per-character widths: * * - utf8_width() sets *start to NULL on invalid UTF-8 and returns 0; * we restore the pointer and advance by one byte, returning width 1 * (matching the strlen()-based fallback in utf8_strwidth()). * * - utf8_width() returns -1 for control characters; we return 0 * (matching ut

 *     (matching utf8_strnwidth() which skips them).
 */
static int utf8_ish_width(const char **start)
{
	const char *old = *start;
	int w = utf8_width(start, NULL);
	if (!*start) {
		*start = old + 1;
		return 1;
	}
	return (w < 0) ? 0 : w;
}

static void show_stats(struct diffstat_t *data, struct diff_options *options)
{