Function print_number

kernel/generic/src/printf/printf_core.c:379–530

Print a number in a given base. * * Print significant digits of a number in given base. * * @param num Number to print. * @param width Width modifier. * @param precision Precision modifier. * @param base Base to print the number in (must be between 2 and 16). * @param flags Flags that modify the way the number is printed. * * @return Number of characters printed. * *

 *
 */
static int print_number(uint64_t num, int width, int precision, int base,
    uint32_t flags, printf_spec_t *ps)
{
	const char *digits;
	if (flags & __PRINTF_FLAG_BIGCHARS)
		digits = digits_big;
	else
		digits = digits_small;

	char data[PRINT_NUMBER_BUFFER_SIZE];
	char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];

	/* Size of number with all prefixes and signs */
	int size = 0;

	/* Put zero at end of string */
	*ptr-- = 0;

	if (num == 0) {
		*ptr-- = '0';
		size++;
	} else {
		do {
			*ptr-- = digits[num % base];
			size++;
		} while (num /= base);
	}

	/* Size of plain number */
	int number_size = size;

	/*
	 * Collect the sum of all prefixes/signs/etc. to calculate padding and
	 * leading zeroes.
	 */
	if (flags & __PRINTF_FLAG_PREFIX) {
		switch (base) {
		case 2:
			/* Binary formating is not standard, but usefull */
			size += 2;
			break;
		case 8:
			size++;
			break;
		case 16:
			size += 2;
			break;
		}
	}

	char sgn = 0;
	if (flags & __PRINTF_FLAG_SIGNED) {
		if (flags & __PRINTF_FLAG_NEGATIVE) {
			sgn = '-';
			size++;
		} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
			sgn = '+';
			size++;