text: /*-*- 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 2022 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/assert.h"
  #include "libc/calls/strace.internal.h"
  #include "libc/calls/syscall_support-nt.internal.h"
  #include "libc/intrin/describeflags.internal.h"
  #include "libc/nt/enum/filemapflags.h"
  #include "libc/nt/memory.h"
  
  __msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
  
  /**
   * Maps view of file mapping into memory on the New Technology.
   *
   * @param hFileMappingObject was returned by CreateFileMapping()
   * @param dwDesiredAccess has kNtFileMap... flags
   * @param opt_lpDesiredBaseAddress may be NULL to let o/s choose
   * @return base address, or NULL on failure
   * @note this wrapper takes care of ABI, STRACE(), and __winerr()
   */
  textwindows void *MapViewOfFileEx(int64_t hFileMappingObject,
                                    uint32_t dwDesiredAccess,
                                    uint32_t dwFileOffsetHigh,
                                    uint32_t dwFileOffsetLow,
                                    size_t dwNumberOfBytesToMap,
                                    void *opt_lpDesiredBaseAddress) {
    void *pStartingAddress;
    pStartingAddress = __imp_MapViewOfFileEx(
        hFileMappingObject, dwDesiredAccess, dwFileOffsetHigh, dwFileOffsetLow,
        dwNumberOfBytesToMap, opt_lpDesiredBaseAddress);
    if (!pStartingAddress) __winerr();
    NTTRACE("MapViewOfFileEx(%ld, %s, %'ld, %'zu, %p) → %p% m",
            hFileMappingObject, DescribeNtFileMapFlags(dwDesiredAccess),
            (uint64_t)dwFileOffsetHigh << 32 | dwFileOffsetLow,
            dwNumberOfBytesToMap, opt_lpDesiredBaseAddress, pStartingAddress);
    return pStartingAddress;
  }
  