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https://github.com/jart/cosmopolitan.git
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8bfd56b59e
Now that these functions are behind _COSMO_SOURCE there's no reason for having the ugly underscore anymore. To use these functions, you need to pass -mcosmo to cosmocc.
64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/bsr.h"
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static inline int PickGoodWidth(unsigned x) {
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if (x < 16) {
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if (x < 2) return 0;
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if (x < 8) return 7;
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return 15;
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} else {
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if (x < 32) return 31;
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return 63;
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}
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}
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/**
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* Converts unsigned 64-bit integer to binary string.
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*
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* @param p needs at least 67 bytes
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* @param z is 0 for DIGITS, 1 for 0bDIGITS, 2 for 0bDIGITS if ≠0
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* @return pointer to nul byte
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*/
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char *FormatBinary64(char p[hasatleast 67], uint64_t x, char z) {
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int i;
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uint64_t b;
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if (x) {
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if (z) {
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*p++ = '0';
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*p++ = 'b';
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}
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i = PickGoodWidth(bsrl(x));
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do {
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b = 1;
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b <<= i;
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*p++ = '0' + !!(x & b);
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} while (i--);
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} else {
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if (z == 1) {
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*p++ = '0';
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*p++ = 'b';
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}
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*p++ = '0';
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}
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*p = 0;
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return p;
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}
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