/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2020 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/assert.h"
#include "libc/fmt/conv.h"
#include "libc/intrin/bits.h"
#include "libc/intrin/weaken.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"

/* TODO(jart): DELETE */

#define GUARANTEE_TERMINATOR 1
#define INITIAL_CAPACITY     (32 - GUARANTEE_TERMINATOR)

/**
 * Grows array.
 * @deprecated favor realloc
 */
bool __grow(void *pp, size_t *capacity, size_t itemsize, size_t extra) {
  void **p, *p1, *p2;
  size_t n1, n2;
  size_t t1, t2;
  extra += GUARANTEE_TERMINATOR;
  p = (void **)pp;
  _unassert(itemsize);
  _unassert((*p && *capacity) || (!*p && !*capacity));
  _unassert(!_isheap(*p) || ((intptr_t)*p & 15) == 0);
  p1 = _isheap(*p) ? *p : NULL;
  p2 = NULL;
  n1 = *capacity;
  n2 = (*p ? n1 + (n1 >> 1) : MAX(4, INITIAL_CAPACITY / itemsize)) + extra;
  if (!__builtin_mul_overflow(n1, itemsize, &t1) &&
      !__builtin_mul_overflow(n2, itemsize, &t2)) {
    if (_weaken(realloc) && (p2 = _weaken(realloc)(p1, ROUNDUP(t2, 32)))) {
      if (!p1 && *p) memcpy(p2, *p, t1);
      bzero((char *)p2 + t1, t2 - t1);
      *capacity = n2;
      *p = p2;
      return true;
    } else {
      enomem();
    }
  } else {
    eoverflow();
  }
  return false;
}
