mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
76 lines
3.1 KiB
C
76 lines
3.1 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 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/fmt/itoa.h"
|
|
#include "libc/nexgen32e/nexgen32e.h"
|
|
|
|
static const unsigned char kTensIndex[] = {
|
|
0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, //
|
|
5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, //
|
|
10, 10, 10, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, //
|
|
15, 15, 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 18, 19, 19, //
|
|
};
|
|
|
|
/**
|
|
* Returns `len(str(x))` where x is an unsigned 64-bit integer.
|
|
*/
|
|
unsigned LengthUint64(uint64_t x) {
|
|
unsigned w;
|
|
if (x) {
|
|
w = kTensIndex[63 ^ __builtin_clzll(x)];
|
|
w += x >= kTens[w];
|
|
return w;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns `len(str(x))` where x is a signed 64-bit integer.
|
|
*/
|
|
unsigned LengthInt64(int64_t x) {
|
|
if (x >= 0) {
|
|
return LengthUint64(x);
|
|
} else {
|
|
return 1 + LengthUint64(-(uint64_t)x);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns decimal string length of uint64 w/ thousands separators.
|
|
*/
|
|
unsigned LengthUint64Thousands(uint64_t x) {
|
|
unsigned w;
|
|
w = LengthUint64(x);
|
|
w += (w - 1) / 3;
|
|
return w;
|
|
}
|
|
|
|
/**
|
|
* Returns decimal string length of int64 w/ thousands separators.
|
|
*/
|
|
unsigned LengthInt64Thousands(int64_t x) {
|
|
unsigned w;
|
|
if (x >= 0) {
|
|
w = LengthUint64(x);
|
|
return w + (w - 1) / 3;
|
|
} else {
|
|
w = LengthUint64(-(uint64_t)x);
|
|
return 1 + w + (w - 1) / 3;
|
|
}
|
|
}
|