Function FormatOneChar

cpp/src/arrow/util/formatting.h:143–143

Based on fmtlib's format_int class: Write digits from right to left into a stack allocated buffer. \pre *cursor points to the byte after the one that will be written. \post *cursor points to the byte that was written.

// \pre *cursor points to the byte after the one that will be written.
// \post *cursor points to the byte that was written.
inline void FormatOneChar(char c, char** cursor) { *(--(*cursor)) = c; }

template <typename Int>
void FormatOneDigit(Int value, char** cursor) {