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// SPDX-License-Identifier: LGPL-3.0-or-later
/**
* \file numlib_itoa.c
*
* Integer to ASCII conversion.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*/
#include "numlib.h"
#include <string.h>
// XXX(micia): benchmark memcpy()-less version, something with rep stos
// amount of data copied over is very small, so it would probably pay off
// leaving memcpy() out
char *Utoa(unsigned long long x, char *dest)
{
char buf[DIGS(x) + 1];
size_t n;
char *p = buf + sizeof(buf);
*--p = '\0';
do {
*--p = '0' + (x % 10);
x /= 10;
} while (x != 0);
n = (buf + sizeof(buf)) - p;
memcpy(dest, p, n);
return dest + n - 1;
}
char *Itoa(long long x, char *dest)
{
char buf[1 + DIGS(x) + 1];
unsigned long long ax; // NOTE keep this unsigned!
size_t n;
char *p = buf + sizeof(buf);
ax = ABS(x); // also handles LLONG_MIN, ax being unsigned
// NOTE: this is still a signed overflow, which is technically
// undefined in standard C
*--p = '\0';
do {
*--p = '0' + (ax % 10);
ax /= 10;
} while (ax != 0);
if (x < 0)
*--p = '-';
n = (buf + sizeof(buf)) - p;
memcpy(dest, p, n);
return dest + n - 1;
}
char *Xtoa(unsigned long long x, char *dest)
{
char buf[XDIGS(x) + 1];
size_t n;
char *p = buf + sizeof(buf);
*--p = '\0';
do {
*--p = "0123456789abcdef"[x & 0xf];
x >>= 4;
} while (x != 0);
n = (buf + sizeof(buf)) - p;
memcpy(dest, p, n);
return dest + n - 1;
}