Commit b1c21e7d authored by Willy Tarreau's avatar Willy Tarreau Committed by Paul E. McKenney
Browse files

tools/nolibc/stdlib: add i64toa() and u64toa() 



These are 64-bit variants of the itoa() and utoa() functions. They also
support reentrant ones, and use the same itoa_buffer. The functions are
a bit larger than the previous ones in 32-bit mode (86 and 98 bytes on
x86_64 and armv7 respectively), which is why we continue to provide them
as separate functions.

Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 66c397c4

tools/include/nolibc/stdlib.h

+72 −0
Original line number Diff line number Diff line
@@ -144,6 +144,78 @@ char *utoa(unsigned long in) 
	return itoa_buffer;

}



/* Converts the unsigned 64-bit integer <in> to its string representation into

 * buffer <buffer>, which must be long enough to store the number and the

 * trailing zero (21 bytes for 18446744073709551615). The buffer is filled from

 * the first byte, and the number of characters emitted (not counting the

 * trailing zero) is returned. The function is constructed in a way to optimize

 * the code size and avoid any divide that could add a dependency on large

 * external functions.

 */

static __attribute__((unused))

int u64toa_r(uint64_t in, char *buffer)

{

	unsigned long long lim;

	int digits = 0;

	int pos = 19; /* start with the highest possible digit */

	int dig;



	do {

		for (dig = 0, lim = 1; dig < pos; dig++)

			lim *= 10;



		if (digits || in >= lim || !pos) {

			for (dig = 0; in >= lim; dig++)

				in -= lim;

			buffer[digits++] = '0' + dig;

		}

	} while (pos--);



	buffer[digits] = 0;

	return digits;

}



/* Converts the signed 64-bit integer <in> to its string representation into

 * buffer <buffer>, which must be long enough to store the number and the

 * trailing zero (21 bytes for -9223372036854775808). The buffer is filled from

 * the first byte, and the number of characters emitted (not counting the

 * trailing zero) is returned.

 */

static __attribute__((unused))

int i64toa_r(int64_t in, char *buffer)

{

	char *ptr = buffer;

	int len = 0;



	if (in < 0) {

		in = -in;

		*(ptr++) = '-';

		len++;

	}

	len += u64toa_r(in, ptr);

	return len;

}



/* converts int64_t <in> to a string using the static itoa_buffer and returns

 * the pointer to that string.

 */

static inline __attribute__((unused))

char *i64toa(int64_t in)

{

	i64toa_r(in, itoa_buffer);

	return itoa_buffer;

}



/* converts uint64_t <in> to a string using the static itoa_buffer and returns

 * the pointer to that string.

 */

static inline __attribute__((unused))

char *u64toa(uint64_t in)

{

	u64toa_r(in, itoa_buffer);

	return itoa_buffer;

}



static __attribute__((unused))

int msleep(unsigned int msecs)

{