/*-*- 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 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/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/calls/wincrash.internal.h"
#include "libc/errno.h"
#include "libc/intrin/strace.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"

static textwindows ssize_t sys_write_nt_impl(int fd, void *data, size_t size,
                                             ssize_t offset) {
  bool32 ok;
  int64_t h, p;
  uint32_t err, sent;
  struct NtOverlapped overlap;

  h = g_fds.p[fd].handle;

  if (offset != -1) {
    // windows changes the file pointer even if overlapped is passed
    _npassert(SetFilePointerEx(h, 0, &p, SEEK_CUR));
  }

  ok = WriteFile(h, data, _clampio(size), &sent,
                 _offset2overlap(h, offset, &overlap));

  if (offset != -1) {
    // windows clobbers file pointer even on error
    _npassert(SetFilePointerEx(h, p, 0, SEEK_SET));
  }

  if (ok) {
    return sent;
  }

  switch (GetLastError()) {
    // case kNtErrorInvalidHandle:
    //   return ebadf(); /* handled by consts.sh */
    // case kNtErrorNotEnoughQuota:
    //   return edquot(); /* handled by consts.sh */
    case kNtErrorBrokenPipe:  // broken pipe
    case kNtErrorNoData:      // closing named pipe
      if (_weaken(__sig_raise)) {
        _weaken(__sig_raise)(SIGPIPE, SI_KERNEL);
        return epipe();
      } else {
        STRACE("broken pipe");
        _Exitr(128 + EPIPE);
      }
    case kNtErrorAccessDenied:  // write doesn't return EACCESS
      return ebadf();
    default:
      return __winerr();
  }
}

textwindows ssize_t sys_write_nt(int fd, const struct iovec *iov, size_t iovlen,
                                 ssize_t opt_offset) {
  ssize_t rc;
  size_t i, total;
  uint32_t size, wrote;
  struct NtOverlapped overlap;
  if (opt_offset < -1) return einval();
  while (iovlen && !iov[0].iov_len) iov++, iovlen--;
  if (iovlen) {
    for (total = i = 0; i < iovlen; ++i) {
      if (!iov[i].iov_len) continue;
      rc = sys_write_nt_impl(fd, iov[i].iov_base, iov[i].iov_len, opt_offset);
      if (rc == -1) return -1;
      total += rc;
      if (opt_offset != -1) opt_offset += rc;
      if (rc < iov[i].iov_len) break;
    }
    return total;
  } else {
    return sys_write_nt_impl(fd, NULL, 0, opt_offset);
  }
}
