cosmopolitan/libc/runtime/mremap.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                              │
│                                                                              │
│ 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/calls/calls.h"
#include "libc/dce.h"
#include "libc/macros.internal.h"
#include "libc/sysv/consts/mremap.h"
#include "libc/sysv/errfuns.h"

#define IP(X)      (intptr_t)(X)
#define VIP(X)     (void *)IP(X)
#define ALIGNED(p) (!(IP(p) & (FRAMESIZE - 1)))

/**
 * Relocates mapping.
 *
 * @param p is old address
 * @param n is old size
 * @param m is new size
 * @param f should have MREMAP_MAYMOVE and may have MAP_FIXED
 * @param q is new address
 */
void *mremap(void *p, size_t n, size_t m, int f, ... /* void *q */) {
  return VIP(enosys()); /* TODO: Implement Me! */
  void *q;
  va_list va;
  if (!IsWindows()) {
    if (!n) return VIP(einval());
    if (!m) return VIP(einval());
    if (!ALIGNED(p)) return VIP(einval());
    n = ROUNDUP(n, FRAMESIZE);
    m = ROUNDUP(m, FRAMESIZE);
    if (f & MREMAP_FIXED) {
      va_start(va, f);
      q = va_arg(va, void *);
      va_end(va);
      if (!ALIGNED(q)) return VIP(einval());
    } else {
      q = NULL;
      if (!(f & MREMAP_MAYMOVE)) {
      }
    }
    return VIP(enosys());
  } else {
    return VIP(enosys());
  }
}