Class: IO

Inherits:
Object
  • Object
show all
Defined in:
mrbgems/mruby-io/src/io.c,
mrbgems/mruby-io/mrblib/io.rb

Direct Known Subclasses

BasicSocket, File

Constant Summary collapse

SEEK_SET = 
0
SEEK_CUR = 
1
SEEK_END = 
2
BUF_SIZE = 
4096

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Object

15.2.20.5.21 (x)



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# File 'mrbgems/mruby-io/src/io.c', line 612

mrb_value
mrb_io_initialize(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  mrb_int fd;
  mrb_value mode, opt;
  int flags;

  mode = opt = mrb_nil_value();

  mrb_get_args(mrb, "i|So", &fd, &mode, &opt);
  if (mrb_nil_p(mode)) {
    mode = mrb_str_new_cstr(mrb, "r");
  }
  if (mrb_nil_p(opt)) {
    opt = mrb_hash_new(mrb);
  }

  flags = mrb_io_modestr_to_flags(mrb, RSTRING_CSTR(mrb, mode));

  mrb_iv_set(mrb, io, mrb_intern_cstr(mrb, "@buf"), mrb_str_new_cstr(mrb, ""));

  fptr = (struct mrb_io *)DATA_PTR(io);
  if (fptr != NULL) {
    fptr_finalize(mrb, fptr, TRUE);
    mrb_free(mrb, fptr);
  }
  fptr = mrb_io_alloc(mrb);

  DATA_TYPE(io) = &mrb_io_type;
  DATA_PTR(io) = fptr;

  fptr->fd = (int)fd;
  fptr->readable = ((flags & FMODE_READABLE) != 0);
  fptr->writable = ((flags & FMODE_WRITABLE) != 0);
  fptr->sync = 0;
  return io;
}

Class Method Details

.open(*args, &block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 14

def self.open(*args, &block)
  io = self.new(*args)

  return io unless block

  begin
    yield io
  ensure
    begin
      io.close unless io.closed?
    rescue StandardError
    end
  end
end

.pipe(&block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 47

def self.pipe(&block)
  if !self.respond_to?(:_pipe)
    raise NotImplementedError, "pipe is not supported on this platform"
  end
  if block
    begin
      r, w = IO._pipe
      yield r, w
    ensure
      r.close unless r.closed?
      w.close unless w.closed?
    end
  else
    IO._pipe
  end
end

.popen(command, mode = 'r', opts = {}, &block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 29

def self.popen(command, mode = 'r', opts={}, &block)
  if !self.respond_to?(:_popen)
    raise NotImplementedError, "popen is not supported on this platform"
  end
  io = self._popen(command, mode, opts)
  return io unless block

  begin
    yield io
  ensure
    begin
      io.close unless io.closed?
    rescue IOError
      # nothing
    end
  end
end

.read(path, length = nil, offset = nil, opt = nil) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 64

def self.read(path, length=nil, offset=nil, opt=nil)
  if not opt.nil?        # 4 arguments
    offset ||= 0
  elsif not offset.nil?  # 3 arguments
    if offset.is_a? Hash
      opt = offset
      offset = 0
    else
      opt = {}
    end
  elsif not length.nil?  # 2 arguments
    if length.is_a? Hash
      opt = length
      offset = 0
      length = nil
    else
      offset = 0
      opt = {}
    end
  else                   # only 1 argument
    opt = {}
    offset = 0
    length = nil
  end

  str = ""
  fd = -1
  io = nil
  begin
    if path[0] == "|"
      io = IO.popen(path[1..-1], (opt[:mode] || "r"))
    else
      mode = opt[:mode] || "r"
      fd = IO.sysopen(path, mode)
      io = IO.open(fd, mode)
    end
    io.seek(offset) if offset > 0
    str = io.read(length)
  ensure
    if io
      io.close
    elsif fd != -1
      IO._sysclose(fd)
    end
  end
  str
end

Instance Method Details

#<<(str) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 135

def <<(str)
  write(str)
  self
end

#_check_readable ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 714

mrb_value
mrb_io_check_readable(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr = io_get_open_fptr(mrb, self);
  if (! fptr->readable) {
    mrb_raise(mrb, E_IO_ERROR, "not opened for reading");
  }
  return mrb_nil_value();
}

#_read_buf ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 172

def _read_buf
  return @buf if @buf && @buf.bytesize >= 4 # maximum UTF-8 character is 4 bytes
  @buf ||= ""
  begin
    @buf += sysread(BUF_SIZE)
  rescue EOFError => e
    raise e if @buf.empty?
  end
end

#close ⇒ Object

15.2.20.5.1



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# File 'mrbgems/mruby-io/src/io.c', line 926

mrb_value
mrb_io_close(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr;
  fptr = io_get_open_fptr(mrb, self);
  fptr_finalize(mrb, fptr, FALSE);
  return mrb_nil_value();
}

#close_on_exec= ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 1238

mrb_value
mrb_io_set_close_on_exec(mrb_state *mrb, mrb_value self)
{
#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
  struct mrb_io *fptr;
  int flag, ret;
  mrb_bool b;

  fptr = io_get_open_fptr(mrb, self);
  mrb_get_args(mrb, "b", &b);
  flag = b ? FD_CLOEXEC : 0;

  if (fptr->fd2 >= 0) {
    if ((ret = fcntl(fptr->fd2, F_GETFD)) == -1) mrb_sys_fail(mrb, "F_GETFD failed");
    if ((ret & FD_CLOEXEC) != flag) {
      ret = (ret & ~FD_CLOEXEC) | flag;
      ret = fcntl(fptr->fd2, F_SETFD, ret);

      if (ret == -1) mrb_sys_fail(mrb, "F_SETFD failed");
    }
  }

  if ((ret = fcntl(fptr->fd, F_GETFD)) == -1) mrb_sys_fail(mrb, "F_GETFD failed");
  if ((ret & FD_CLOEXEC) != flag) {
    ret = (ret & ~FD_CLOEXEC) | flag;
    ret = fcntl(fptr->fd, F_SETFD, ret);
    if (ret == -1) mrb_sys_fail(mrb, "F_SETFD failed");
  }

  return mrb_bool_value(b);
#else
  mrb_raise(mrb, E_NOTIMP_ERROR, "IO#close_on_exec= is not supported on the platform");
  return mrb_nil_value();
#endif
}

#close_on_exec? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'mrbgems/mruby-io/src/io.c', line 1214

mrb_value
mrb_io_close_on_exec_p(mrb_state *mrb, mrb_value self)
{
#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
  struct mrb_io *fptr;
  int ret;

  fptr = io_get_open_fptr(mrb, self);

  if (fptr->fd2 >= 0) {
    if ((ret = fcntl(fptr->fd2, F_GETFD)) == -1) mrb_sys_fail(mrb, "F_GETFD failed");
    if (!(ret & FD_CLOEXEC)) return mrb_false_value();
  }

  if ((ret = fcntl(fptr->fd, F_GETFD)) == -1) mrb_sys_fail(mrb, "F_GETFD failed");
  if (!(ret & FD_CLOEXEC)) return mrb_false_value();
  return mrb_true_value();

#else
  mrb_raise(mrb, E_NOTIMP_ERROR, "IO#close_on_exec? is not supported on the platform");
  return mrb_false_value();
#endif
}

#close_write ⇒ Object

15.2.20.5.1



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# File 'mrbgems/mruby-io/src/io.c', line 935

mrb_value
mrb_io_close_write(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr;
  fptr = io_get_open_fptr(mrb, self);
  if (close((int)fptr->fd2) == -1) {
    mrb_sys_fail(mrb, "close");
  }
  return mrb_nil_value();
}

#closed? ⇒ Boolean

15.2.20.5.2

Returns:

  • (Boolean) 


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# File 'mrbgems/mruby-io/src/io.c', line 946

mrb_value
mrb_io_closed(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  fptr = (struct mrb_io *)mrb_data_get_ptr(mrb, io, &mrb_io_type);
  if (fptr == NULL || fptr->fd >= 0) {
    return mrb_false_value();
  }

  return mrb_true_value();
}

#each(&block) ⇒ Object Also known as: each_line

15.2.20.5.3



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 305

def each(&block)
  return to_enum unless block

  while line = self.gets
    block.call(line)
  end
  self
end

#each_byte(&block) ⇒ Object Also known as: each_char

15.2.20.5.4



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 315

def each_byte(&block)
  return to_enum(:each_byte) unless block

  while char = self.getc
    block.call(char)
  end
  self
end

#eof? ⇒ Boolean Also known as: eof

Returns:

  • (Boolean) 


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# File 'mrbgems/mruby-io/mrblib/io.rb', line 140

def eof?
  _check_readable
  begin
    _read_buf
    return @buf.empty?
  rescue EOFError
    return true
  end
end

#fileno ⇒ Object Also known as: to_i

15.2.20.5.2



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# File 'mrbgems/mruby-io/src/io.c', line 1206

mrb_value
mrb_io_fileno(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  fptr = io_get_open_fptr(mrb, io);
  return mrb_fixnum_value(fptr->fd);
}

#flush ⇒ Object

Raises:



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 112

def flush
  # mruby-io always writes immediately (no output buffer).
  raise IOError, "closed stream" if self.closed?
  self
end

#getc ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 296

def getc
  begin
    readchar
  rescue EOFError
    nil
  end
end

#gets(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 281

def gets(*args)
  begin
    readline(*args)
  rescue EOFError
    nil
  end
end

#hash ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 118

def hash
  # We must define IO#hash here because IO includes Enumerable and
  # Enumerable#hash will call IO#read...
  self.__id__
end

#initialize_copy ⇒ Object

15.2.20.5.21 (x)



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# File 'mrbgems/mruby-io/src/io.c', line 563

mrb_value
mrb_io_initialize_copy(mrb_state *mrb, mrb_value copy)
{
  mrb_value orig;
  mrb_value buf;
  struct mrb_io *fptr_copy;
  struct mrb_io *fptr_orig;
  mrb_bool failed = TRUE;

  mrb_get_args(mrb, "o", &orig);
  fptr_orig = io_get_open_fptr(mrb, orig);
  fptr_copy = (struct mrb_io *)DATA_PTR(copy);
  if (fptr_orig == fptr_copy) return copy;
  if (fptr_copy != NULL) {
    fptr_finalize(mrb, fptr_copy, FALSE);
    mrb_free(mrb, fptr_copy);
  }
  fptr_copy = (struct mrb_io *)mrb_io_alloc(mrb);

  DATA_TYPE(copy) = &mrb_io_type;
  DATA_PTR(copy) = fptr_copy;

  buf = mrb_iv_get(mrb, orig, mrb_intern_cstr(mrb, "@buf"));
  mrb_iv_set(mrb, copy, mrb_intern_cstr(mrb, "@buf"), buf);

  fptr_copy->fd = mrb_dup(mrb, fptr_orig->fd, &failed);
  if (failed) {
    mrb_sys_fail(mrb, 0);
  }
  mrb_fd_cloexec(mrb, fptr_copy->fd);

  if (fptr_orig->fd2 != -1) {
    fptr_copy->fd2 = mrb_dup(mrb, fptr_orig->fd2, &failed);
    if (failed) {
      close(fptr_copy->fd);
      mrb_sys_fail(mrb, 0);
    }
    mrb_fd_cloexec(mrb, fptr_copy->fd2);
  }

  fptr_copy->pid = fptr_orig->pid;
  fptr_copy->readable = fptr_orig->readable;
  fptr_copy->writable = fptr_orig->writable;
  fptr_copy->sync = fptr_orig->sync;
  fptr_copy->is_socket = fptr_orig->is_socket;

  return copy;
}

#isatty ⇒ Object Also known as: tty? 



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# File 'mrbgems/mruby-io/src/io.c', line 724

mrb_value
mrb_io_isatty(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr;

  fptr = io_get_open_fptr(mrb, self);
  if (isatty(fptr->fd) == 0)
    return mrb_false_value();
  return mrb_true_value();
}

#pid ⇒ Object

15.2.20.5.2



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# File 'mrbgems/mruby-io/src/io.c', line 958

mrb_value
mrb_io_pid(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  fptr = io_get_open_fptr(mrb, io);

  if (fptr->pid > 0) {
    return mrb_fixnum_value(fptr->pid);
  }

  return mrb_nil_value();
}

#pos ⇒ Object Also known as: tell

Raises:



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 151

def pos
  raise IOError if closed?
  sysseek(0, SEEK_CUR) - @buf.bytesize
end

#pos=(i) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 157

def pos=(i)
  seek(i, SEEK_SET)
end

#print(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 350

def print(*args)
  i = 0
  len = args.size
  while i < len
    write args[i].to_s
    i += 1
  end
end

#printf(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 359

def printf(*args)
  write sprintf(*args)
  nil
end

#puts(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 337

def puts(*args)
  i = 0
  len = args.size
  while i < len
    s = args[i].to_s
    write s
    write "\n" if (s[-1] != "\n")
    i += 1
  end
  write "\n" if len == 0
  nil
end

#read(length = nil, outbuf = "") ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 192

def read(length = nil, outbuf = "")
  unless length.nil?
    unless length.is_a? Fixnum
      raise TypeError.new "can't convert #{length.class} into Integer"
    end
    if length < 0
      raise ArgumentError.new "negative length: #{length} given"
    end
    if length == 0
      return ""   # easy case
    end
  end

  array = []
  while 1
    begin
      _read_buf
    rescue EOFError
      array = nil if array.empty? and (not length.nil?) and length != 0
      break
    end

    if length
      consume = (length <= @buf.bytesize) ? length : @buf.bytesize
      array.push IO._bufread(@buf, consume)
      length -= consume
      break if length == 0
    else
      array.push @buf
      @buf = ''
    end
  end

  if array.nil?
    outbuf.replace("")
    nil
  else
    outbuf.replace(array.join)
  end
end

#readchar ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 289

def readchar
  _read_buf
  c = @buf[0]
  @buf[0] = ""
  c
end

#readline(arg = "\n", limit = nil) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 233

def readline(arg = "\n", limit = nil)
  case arg
  when String
    rs = arg
  when Fixnum
    rs = "\n"
    limit = arg
  else
    raise ArgumentError
  end

  if rs.nil?
    return read
  end

  if rs == ""
    rs = "\n\n"
  end

  array = []
  while 1
    begin
      _read_buf
    rescue EOFError
      array = nil if array.empty?
      break
    end

    if limit && limit <= @buf.size
      array.push @buf[0, limit]
      @buf[0, limit] = ""
      break
    elsif idx = @buf.index(rs)
      len = idx + rs.size
      array.push @buf[0, len]
      @buf[0, len] = ""
      break
    else
      array.push @buf
      @buf = ''
    end
  end

  raise EOFError.new "end of file reached" if array.nil?

  array.join
end

#readlines ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 329

def readlines
  ary = []
  while (line = gets)
    ary << line
  end
  ary
end

#rewind ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 161

def rewind
  seek(0, SEEK_SET)
end

#seek(i, whence = SEEK_SET) ⇒ Object

Raises:



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 165

def seek(i, whence = SEEK_SET)
  raise IOError if closed?
  sysseek(i, whence)
  @buf = ''
  0
end

#sync ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 1286

mrb_value
mrb_io_sync(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr;
  fptr = io_get_open_fptr(mrb, self);
  return mrb_bool_value(fptr->sync);
}

#sync= ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 1274

mrb_value
mrb_io_set_sync(mrb_state *mrb, mrb_value self)
{
  struct mrb_io *fptr;
  mrb_bool b;

  fptr = io_get_open_fptr(mrb, self);
  mrb_get_args(mrb, "b", &b);
  fptr->sync = b;
  return mrb_bool_value(b);
}

#sysread ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 818

mrb_value
mrb_io_sysread(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  mrb_value buf = mrb_nil_value();
  mrb_int maxlen;
  int ret;

  mrb_get_args(mrb, "i|S", &maxlen, &buf);
  if (maxlen < 0) {
    mrb_raise(mrb, E_ARGUMENT_ERROR, "negative expanding string size");
  }
  else if (maxlen == 0) {
    return mrb_str_new(mrb, NULL, maxlen);
  }

  if (mrb_nil_p(buf)) {
    buf = mrb_str_new(mrb, NULL, maxlen);
  }

  if (RSTRING_LEN(buf) != maxlen) {
    buf = mrb_str_resize(mrb, buf, maxlen);
  } else {
    mrb_str_modify(mrb, RSTRING(buf));
  }

  fptr = (struct mrb_io *)io_get_open_fptr(mrb, io);
  if (!fptr->readable) {
    mrb_raise(mrb, E_IO_ERROR, "not opened for reading");
  }
  ret = read(fptr->fd, RSTRING_PTR(buf), (fsize_t)maxlen);
  switch (ret) {
    case 0: /* EOF */
      if (maxlen == 0) {
        buf = mrb_str_new_cstr(mrb, "");
      } else {
        mrb_raise(mrb, E_EOF_ERROR, "sysread failed: End of File");
      }
      break;
    case -1: /* Error */
      mrb_sys_fail(mrb, "sysread failed");
      break;
    default:
      if (RSTRING_LEN(buf) != ret) {
        buf = mrb_str_resize(mrb, buf, ret);
      }
      break;
  }

  return buf;
}

#sysseek ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 870

mrb_value
mrb_io_sysseek(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  off_t pos;
  mrb_int offset, whence = -1;

  mrb_get_args(mrb, "i|i", &offset, &whence);
  if (whence < 0) {
    whence = 0;
  }

  fptr = io_get_open_fptr(mrb, io);
  pos = lseek(fptr->fd, (off_t)offset, (int)whence);
  if (pos == -1) {
    mrb_sys_fail(mrb, "sysseek");
  }
  if (pos > MRB_INT_MAX) {
#ifndef MRB_WITHOUT_FLOAT
    return mrb_float_value(mrb, (mrb_float)pos);
#else
    mrb_raise(mrb, E_IO_ERROR, "sysseek reached too far for MRB_WITHOUT_FLOAT");
#endif
  } else {
    return mrb_fixnum_value(pos);
  }
}

#syswrite ⇒ Object 



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# File 'mrbgems/mruby-io/src/io.c', line 898

mrb_value
mrb_io_syswrite(mrb_state *mrb, mrb_value io)
{
  struct mrb_io *fptr;
  mrb_value str, buf;
  int fd, length;

  fptr = io_get_open_fptr(mrb, io);
  if (! fptr->writable) {
    mrb_raise(mrb, E_IO_ERROR, "not opened for writing");
  }

  mrb_get_args(mrb, "S", &str);
  buf = str;

  if (fptr->fd2 == -1) {
    fd = fptr->fd;
  } else {
    fd = fptr->fd2;
  }
  length = write(fd, RSTRING_PTR(buf), (fsize_t)RSTRING_LEN(buf));
  if (length == -1) {
    mrb_sys_fail(mrb, 0);
  }

  return mrb_fixnum_value(length);
}

#ungetc(substr) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 182

def ungetc(substr)
  raise TypeError.new "expect String, got #{substr.class}" unless substr.is_a?(String)
  if @buf.empty?
    @buf = substr.dup
  else
    @buf = substr + @buf
  end
  nil
end

#write(string) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 124

def write(string)
  str = string.is_a?(String) ? string : string.to_s
  return 0 if str.empty?
  unless @buf.empty?
    # reset real pos ignore buf
    seek(pos, SEEK_SET)
  end
  len = syswrite(str)
  len
end