/*-*- 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
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ¡
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/calls/calls.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/limits.h"
#include "libc/log/libfatal.internal.h"
#include "libc/runtime/ezmap.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"

// TODO(jart): DELETE

_Hide int MapFileRead(const char *filename, struct MappedFile *mf) {
  mf->addr = MAP_FAILED;
  if ((mf->fd = open(filename, O_RDONLY)) != -1 &&
      (mf->size = getfiledescriptorsize(mf->fd)) < INT_MAX &&
      (mf->addr = mf->size ? mmap(NULL, mf->size, PROT_READ,
                                  MAP_PRIVATE | MAP_POPULATE, mf->fd, 0)
                           : NULL) != MAP_FAILED) {
    return 0;
  } else {
    UnmapFile(mf);
    return -1;
  }
}

_Hide int UnmapFile(struct MappedFile *mf) {
  int rc;
  rc = 0;
  if (mf->addr && mf->addr != MAP_FAILED) {
    rc |= munmap(mf->addr, mf->size);
    mf->addr = MAP_FAILED;
  }
  if (mf->fd != -1) {
    rc |= close(mf->fd);
    mf->fd = -1;
  }
  mf->size = 0;
  return rc;
}
