mirror of https://gitea.it/1414codeforge/ubgpsuite
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
// 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;
|
|
}
|