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add itoa(), replace snprintf("%d") calls

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we can save some space and still end up with a 20% faster function

Change-Id: Ia58900122944b8527ef01a673afe18ea794acb41
This commit is contained in:
William Wilgus 2025-02-03 01:05:21 -05:00 • committed by William Wilgus
parent 9e61d53c7c
commit f55fe21f66
9 changed files with 98 additions and 41 deletions
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45
firmware/common/itoa.c Normal file
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@ -0,0 +1,45 @@
#include <stddef.h>
#include "string.h"
#include "strmemccpy.h"
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file was part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define INT_DIGITS 19 /* enough for 64 bit integer */
char *itoa(char *buf, size_t bufsz, long int i)
{
/* Room for INT_DIGITS digits, - and '\0' */
static char intbuf[INT_DIGITS + 2];
char *p = intbuf + INT_DIGITS + 1; /* points to terminating '\0' */
if (i >= 0) {
do {
*--p = '0' + (i % 10);
i /= 10;
} while (i != 0);
}
else { /* i < 0 */
do {
*--p = '0' - (i % 10);
i /= 10;
} while (i != 0);
*--p = '-';
}
strmemccpy(buf, p, bufsz);
return buf;
}