/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2021 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/fmt/itoa.h"

/**
 * Converts unsigned 64-bit integer to string w/ commas.
 *
 * @param p needs at least 27 bytes
 * @return pointer to nul byte
 */
dontinline char *FormatUint64Thousands(char p[static 27], uint64_t x) {
  size_t i;
  char m[26];
  i = 0;
  do {
    m[i++] = x % 10 + '0';
    x = x / 10;
  } while (x);
  for (;;) {
    *p++ = m[--i];
    if (!i) break;
    if (!(i % 3)) *p++ = ',';
  }
  *p = '\0';
  return p;
}

/**
 * Converts 64-bit integer to string w/ commas.
 *
 * @param p needs at least 27 bytes
 * @return pointer to nul byte
 */
char *FormatInt64Thousands(char p[static 27], int64_t x) {
  if (x < 0) *p++ = '-', x = -(uint64_t)x;
  return FormatUint64Thousands(p, x);
}
