cosmopolitan/libc/fmt/itoa64radix10.greg.c

52 lines
2.6 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program 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; version 2 of the License. │
│ │
│ This program 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 this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/reverse.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/itoa.h"
#include "libc/limits.h"
/**
* Converts unsigned 64-bit integer to string.
* @param a needs at least 21 bytes
* @return bytes written w/o nul
*/
noinline size_t uint64toarray_radix10(uint64_t i, char *a) {
size_t j;
j = 0;
do {
a[j++] = i % 10 + '0';
i /= 10;
} while (i > 0);
a[j] = '\0';
reverse(a, j);
return j;
}
/**
* Converts signed 64-bit integer to string.
* @param a needs at least 21 bytes
* @return bytes written w/o nul
*/
size_t int64toarray_radix10(int64_t i, char *a) {
if (i >= 0) return uint64toarray_radix10(i, a);
*a++ = '-';
return 1 + uint64toarray_radix10(-i, a);
}