text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013-2018 Damien P. George
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "py/runtime.h"
  #include "py/stream.h"
  #include "extmod/vfs_posix.h"
  #include "supervisor/shared/translate.h"
  
  #if defined(MICROPY_VFS_POSIX) && MICROPY_VFS_POSIX
  
  #include <fcntl.h>
  
  #ifdef _WIN32
  #define fsync _commit
  #endif
  
  typedef struct _mp_obj_vfs_posix_file_t {
      mp_obj_base_t base;
      int fd;
  } mp_obj_vfs_posix_file_t;
  
  #ifdef MICROPY_CPYTHON_COMPAT
  STATIC void check_fd_is_open(const mp_obj_vfs_posix_file_t *o) {
      if (o->fd < 0) {
          nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, translate("I/O operation on closed file")));
      }
  }
  #else
  #define check_fd_is_open(o)
  #endif
  
  STATIC void vfs_posix_file_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
      (void)kind;
      mp_obj_vfs_posix_file_t *self = MP_OBJ_TO_PTR(self_in);
      mp_printf(print, "<io.%s %d>", mp_obj_get_type_str(self_in), self->fd);
  }
  
  mp_obj_t mp_vfs_posix_file_open(const mp_obj_type_t *type, mp_obj_t file_in, mp_obj_t mode_in) {
      mp_obj_vfs_posix_file_t *o = m_new_obj(mp_obj_vfs_posix_file_t);
      const char *mode_s = mp_obj_str_get_str(mode_in);
  
      int mode_rw = 0, mode_x = 0;
      while (*mode_s) {
          switch (*mode_s++) {
              case 'r':
                  mode_rw = O_RDONLY;
                  break;
              case 'w':
                  mode_rw = O_WRONLY;
                  mode_x = O_CREAT | O_TRUNC;
                  break;
              case 'a':
                  mode_rw = O_WRONLY;
                  mode_x = O_CREAT | O_APPEND;
                  break;
              case '+':
                  mode_rw = O_RDWR;
                  break;
              #if MICROPY_PY_IO_FILEIO
              // If we don't have io.FileIO, then files are in text mode implicitly
              case 'b':
                  type = &mp_type_vfs_posix_fileio;
                  break;
              case 't':
                  type = &mp_type_vfs_posix_textio;
                  break;
              #endif
          }
      }
  
      o->base.type = type;
  
      mp_obj_t fid = file_in;
  
      if (MP_OBJ_IS_SMALL_INT(fid)) {
          o->fd = MP_OBJ_SMALL_INT_VALUE(fid);
          return MP_OBJ_FROM_PTR(o);
      }
  
      const char *fname = mp_obj_str_get_str(fid);
      int fd = open(fname, mode_x | mode_rw, 0644);
      if (fd == -1) {
          mp_raise_OSError(errno);
      }
      o->fd = fd;
      return MP_OBJ_FROM_PTR(o);
  }
  
  STATIC mp_obj_t vfs_posix_file_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
      static const mp_arg_t allowed_args[] = {
          { MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
          { MP_QSTR_mode, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_QSTR(MP_QSTR_r)} },
      };
  
      mp_arg_val_t arg_vals[MP_ARRAY_SIZE(allowed_args)];
      mp_arg_parse_all(n_args, args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, arg_vals);
      return mp_vfs_posix_file_open(type, arg_vals[0].u_obj, arg_vals[1].u_obj);
  }
  
  STATIC mp_obj_t vfs_posix_file_fileno(mp_obj_t self_in) {
      mp_obj_vfs_posix_file_t *self = MP_OBJ_TO_PTR(self_in);
      check_fd_is_open(self);
      return MP_OBJ_NEW_SMALL_INT(self->fd);
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_1(vfs_posix_file_fileno_obj, vfs_posix_file_fileno);
  
  STATIC mp_obj_t vfs_posix_file___exit__(size_t n_args, const mp_obj_t *args) {
      (void)n_args;
      return mp_stream_close(args[0]);
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(vfs_posix_file___exit___obj, 4, 4, vfs_posix_file___exit__);
  
  STATIC mp_uint_t vfs_posix_file_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
      mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
      check_fd_is_open(o);
      mp_int_t r = read(o->fd, buf, size);
      if (r == -1) {
          *errcode = errno;
          return MP_STREAM_ERROR;
      }
      return r;
  }
  
  STATIC mp_uint_t vfs_posix_file_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
      mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
      check_fd_is_open(o);
      #if MICROPY_PY_OS_DUPTERM
      if (o->fd <= STDERR_FILENO) {
          mp_hal_stdout_tx_strn(buf, size);
          return size;
      }
      #endif
      mp_int_t r = write(o->fd, buf, size);
      while (r == -1 && errno == EINTR) {
          if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL) {
              mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
              MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
              nlr_raise(obj);
          }
          r = write(o->fd, buf, size);
      }
      if (r == -1) {
          *errcode = errno;
          return MP_STREAM_ERROR;
      }
      return r;
  }
  
  STATIC mp_uint_t vfs_posix_file_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
      mp_obj_vfs_posix_file_t *o = MP_OBJ_TO_PTR(o_in);
      check_fd_is_open(o);
      switch (request) {
          case MP_STREAM_FLUSH:
              if (fsync(o->fd) < 0) {
                  *errcode = errno;
                  return MP_STREAM_ERROR;
              }
              return 0;
          case MP_STREAM_SEEK: {
              struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
              off_t off = lseek(o->fd, s->offset, s->whence);
              if (off == (off_t)-1) {
                  *errcode = errno;
                  return MP_STREAM_ERROR;
              }
              s->offset = off;
              return 0;
          }
          case MP_STREAM_CLOSE:
              close(o->fd);
              #ifdef MICROPY_CPYTHON_COMPAT
              o->fd = -1;
              #endif
              return 0;
          default:
              *errcode = EINVAL;
              return MP_STREAM_ERROR;
      }
  }
  
  STATIC const mp_rom_map_elem_t rawfile_locals_dict_table[] = {
      { MP_ROM_QSTR(MP_QSTR_fileno), MP_ROM_PTR(&vfs_posix_file_fileno_obj) },
      { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
      { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
      { MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
      { MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj) },
      { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
      { MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
      { MP_ROM_QSTR(MP_QSTR_tell), MP_ROM_PTR(&mp_stream_tell_obj) },
      { MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
      { MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
      { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
      { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&vfs_posix_file___exit___obj) },
  };
  
  STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
  
  #if MICROPY_PY_IO_FILEIO
  STATIC const mp_stream_p_t fileio_stream_p = {
      .read = vfs_posix_file_read,
      .write = vfs_posix_file_write,
      .ioctl = vfs_posix_file_ioctl,
  };
  
  const mp_obj_type_t mp_type_vfs_posix_fileio = {
      { &mp_type_type },
      .name = MP_QSTR_FileIO,
      .print = vfs_posix_file_print,
      .make_new = vfs_posix_file_make_new,
      .getiter = mp_identity_getiter,
      .iternext = mp_stream_unbuffered_iter,
      .protocol = &fileio_stream_p,
      .locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
  };
  #endif
  
  STATIC const mp_stream_p_t textio_stream_p = {
      .read = vfs_posix_file_read,
      .write = vfs_posix_file_write,
      .ioctl = vfs_posix_file_ioctl,
      .is_text = true,
  };
  
  const mp_obj_type_t mp_type_vfs_posix_textio = {
      { &mp_type_type },
      .name = MP_QSTR_TextIOWrapper,
      .print = vfs_posix_file_print,
      .make_new = vfs_posix_file_make_new,
      .getiter = mp_identity_getiter,
      .iternext = mp_stream_unbuffered_iter,
      .protocol = &textio_stream_p,
      .locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
  };
  
  const mp_obj_vfs_posix_file_t mp_sys_stdin_obj  = {{&mp_type_textio}, STDIN_FILENO};
  const mp_obj_vfs_posix_file_t mp_sys_stdout_obj = {{&mp_type_textio}, STDOUT_FILENO};
  const mp_obj_vfs_posix_file_t mp_sys_stderr_obj = {{&mp_type_textio}, STDERR_FILENO};
  
  #endif // MICROPY_VFS_POSIX
  