uclibc-ng/libc/misc/internals/itoa.c

/* itoa.c <ndf@linux.mit.edu> */
#define __MAX_INT_CHARS 7

char *itoa(int i)
{
	static char a[__MAX_INT_CHARS];
	char *b = a + sizeof(a) - 1;
	int sign = (i < 0);

	if (sign)
		i = -i;
	*b = 0;
	do {
		*--b = '0' + (i % 10);
		i /= 10;
	}
	while (i);
	if (sign)
		*--b = '-';
	return b;
}