1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
4 # Copyright 2008 Floréal Morandat <morandat@lirmm.fr>
5 # Copyright 2008 Jean-Sébastien Gélinas <calestar@gmail.com>
7 # This file is free software, which comes along with NIT. This software is
8 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
10 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
11 # is kept unaltered, and a notification of the changes is added.
12 # You are allowed to redistribute it and sell it, alone or is a part of
15 # File manipulations (create, read, write, etc.)
19 intrude import text
::ropes
27 #include <sys/types.h>
35 # `Stream` used to interact with a File or FileDescriptor
36 abstract class FileStream
38 # The path of the file.
39 var path
: nullable String = null
42 private var file
: nullable NativeFile = null
44 # The status of a file. see POSIX stat(2).
46 # var f = new FileReader.open("/etc/issue")
47 # assert f.file_stat.is_file
49 # Return null in case of error
50 fun file_stat
: nullable FileStat
52 var stat
= _file
.file_stat
53 if stat
.address_is_null
then return null
54 return new FileStat(stat
)
57 # File descriptor of this file
58 fun fd
: Int do return _file
.fileno
62 if _file
== null then return
63 if _file
.address_is_null
then
64 if last_error
!= null then return
65 last_error
= new IOError("Cannot close unopened file")
68 var i
= _file
.io_close
70 last_error
= new IOError("Close failed due to error {sys.errno.strerror}")
75 # Sets the buffering mode for the current FileStream
77 # If the buf_size is <= 0, its value will be 512 by default
79 # The mode is any of the buffer_mode enumeration in `Sys`:
81 # * `buffer_mode_full`
82 # * `buffer_mode_line`
83 # * `buffer_mode_none`
84 fun set_buffering_mode
(buf_size
, mode
: Int) do
85 if buf_size
<= 0 then buf_size
= 512
86 if _file
.set_buffering_type
(buf_size
, mode
) != 0 then
87 last_error
= new IOError("Error while changing buffering type for FileStream, returned error {sys.errno.strerror}")
92 # `Stream` that can read from a File
99 # Open the same file again.
100 # The original path is reused, therefore the reopened file can be a different file.
102 # var f = new FileReader.open("/etc/issue")
103 # var l = f.read_line
105 # assert l == f.read_line
108 if not eof
and not _file
.address_is_null
then close
110 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
111 if _file
.address_is_null
then
112 last_error
= new IOError("Error: Opening file at '{path.as(not null)}' failed with '{sys.errno.strerror}'")
127 redef fun fill_buffer
129 var nb
= _file
.io_read
(_buffer
, _buffer_capacity
)
139 redef var end_reached
= false
141 # Open the file at `path` for reading.
143 # var f = new FileReader.open("/etc/issue")
144 # assert not f.end_reached
147 # In case of error, `last_error` is set
149 # f = new FileReader.open("/fail/does not/exist")
150 # assert f.end_reached
151 # assert f.last_error != null
152 init open
(path
: String)
156 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
157 if _file
.address_is_null
then
158 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
163 # Creates a new File stream from a file descriptor
165 # This is a low-level method.
166 init from_fd
(fd
: Int) do
169 _file
= fd
.fd_to_stream
(read_only
)
170 if _file
.address_is_null
then
171 last_error
= new IOError("Error: Converting fd {fd} to stream failed with '{sys.errno.strerror}'")
177 # `Stream` that can write to a File
182 redef fun write_bytes
(s
) do
183 if last_error
!= null then return
184 if not _is_writable
then
185 last_error
= new IOError("cannot write to non-writable stream")
188 write_native
(s
.items
, s
.length
)
193 if last_error
!= null then return
194 if not _is_writable
then
195 last_error
= new IOError("cannot write to non-writable stream")
198 for i
in s
.substrings
do write_native
(i
.to_cstring
, i
.length
)
201 redef fun write_byte
(value
)
203 if last_error
!= null then return
204 if not _is_writable
then
205 last_error
= new IOError("Cannot write to non-writable stream")
208 if _file
.address_is_null
then
209 last_error
= new IOError("Writing on a null stream")
214 var err
= _file
.write_byte
(value
)
217 last_error
= new IOError("Problem writing a byte: {err}")
226 redef var is_writable
= false
228 # Write `len` bytes from `native`.
229 private fun write_native
(native
: NativeString, len
: Int)
231 if last_error
!= null then return
232 if not _is_writable
then
233 last_error
= new IOError("Cannot write to non-writable stream")
236 if _file
.address_is_null
then
237 last_error
= new IOError("Writing on a null stream")
241 var err
= _file
.io_write
(native
, len
)
244 last_error
= new IOError("Problem in writing : {err} {len} \n")
248 # Open the file at `path` for writing.
249 init open
(path
: String)
251 _file
= new NativeFile.io_open_write
(path
.to_cstring
)
254 if _file
.address_is_null
then
255 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
260 # Creates a new File stream from a file descriptor
261 init from_fd
(fd
: Int) do
263 _file
= fd
.fd_to_stream
(wipe_write
)
265 if _file
.address_is_null
then
266 last_error
= new IOError("Error: Opening stream from file descriptor {fd} failed with '{sys.errno.strerror}'")
273 # Creates a file stream from a file descriptor `fd` using the file access `mode`.
275 # NOTE: The `mode` specified must be compatible with the one used in the file descriptor.
276 private fun fd_to_stream
(mode
: NativeString): NativeFile is extern "file_int_fdtostream"
279 # Constant for read-only file streams
280 private fun read_only
: NativeString do return once
"r".to_cstring
282 # Constant for write-only file streams
284 # If a stream is opened on a file with this method,
285 # it will wipe the previous file if any.
286 # Else, it will create the file.
287 private fun wipe_write
: NativeString do return once
"w".to_cstring
289 ###############################################################################
291 # Standard input stream.
293 # The class of the default value of `sys.stdin`.
298 _file
= new NativeFile.native_stdin
303 redef fun poll_in
is extern "file_stdin_poll_in"
306 # Standard output stream.
308 # The class of the default value of `sys.stdout`.
312 _file
= new NativeFile.native_stdout
315 set_buffering_mode
(256, sys
.buffer_mode_line
)
319 # Standard error stream.
321 # The class of the default value of `sys.stderr`.
325 _file
= new NativeFile.native_stderr
331 ###############################################################################
334 # Like `write_to` but take care of creating the file
335 fun write_to_file
(filepath
: String)
337 var stream
= new FileWriter.open
(filepath
)
343 # Utility class to access file system services
345 # Usually created with `Text::to_path`.
348 private var path
: String
351 redef fun to_s
do return path
353 # Name of the file name at `to_s`
356 # var path = "/tmp/somefile".to_path
357 # assert path.filename == "somefile"
359 var filename
: String = path
.basename
("") is lazy
361 # Does the file at `path` exists?
362 fun exists
: Bool do return stat
!= null
364 # Information on the file at `self` following symbolic links
366 # Returns `null` if there is no file at `self`.
368 # assert "/etc/".to_path.stat.is_dir
369 # assert "/etc/issue".to_path.stat.is_file
370 # assert "/fail/does not/exist".to_path.stat == null
373 # var p = "/tmp/".to_path
375 # if stat != null then # Does `p` exist?
376 # print "It's size is {stat.size}"
377 # if stat.is_dir then print "It's a directory"
380 fun stat
: nullable FileStat
382 var stat
= path
.to_cstring
.file_stat
383 if stat
.address_is_null
then return null
384 return new FileStat(stat
)
387 # Information on the file or link at `self`
389 # Do not follow symbolic links.
390 fun link_stat
: nullable FileStat
392 var stat
= path
.to_cstring
.file_lstat
393 if stat
.address_is_null
then return null
394 return new FileStat(stat
)
397 # Delete a file from the file system, return `true` on success
398 fun delete
: Bool do return path
.to_cstring
.file_delete
400 # Copy content of file at `path` to `dest`
406 var output
= dest
.open_wo
408 while not input
.eof
do
409 var buffer
= input
.read
(1024)
417 # Open this file for reading
419 # Require: `exists and not link_stat.is_dir`
420 fun open_ro
: FileReader
422 # TODO manage streams error when they are merged
423 return new FileReader.open
(path
)
426 # Open this file for writing
428 # Require: `not exists or not stat.is_dir`
429 fun open_wo
: FileWriter
431 # TODO manage streams error when they are merged
432 return new FileWriter.open
(path
)
435 # Read all the content of the file
438 # var content = "/etc/issue".to_path.read_all
442 # See `Reader::read_all` for details.
443 fun read_all
: String do return read_all_bytes
.to_s
445 fun read_all_bytes
: Bytes
448 var res
= s
.read_all_bytes
453 # Read all the lines of the file
456 # var lines = "/etc/passwd".to_path.read_lines
458 # print "{lines.length} users"
461 # var fields = l.split(":")
462 # print "name={fields[0]} uid={fields[2]}"
466 # See `Reader::read_lines` for details.
467 fun read_lines
: Array[String]
470 var res
= s
.read_lines
475 # Return an iterator on each line of the file
478 # for l in "/etc/passwd".to_path.each_line do
479 # var fields = l.split(":")
480 # print "name={fields[0]} uid={fields[2]}"
484 # Note: the stream is automatically closed at the end of the file (see `LineIterator::close_on_finish`)
486 # See `Reader::each_line` for details.
487 fun each_line
: LineIterator
490 var res
= s
.each_line
491 res
.close_on_finish
= true
496 # Lists the name of the files contained within the directory at `path`
498 # Require: `exists and is_dir`
499 fun files
: Array[Path]
501 var files
= new Array[Path]
502 for filename
in path
.files
do
503 files
.add
new Path(path
/ filename
)
508 # Delete a directory and all of its content, return `true` on success
510 # Does not go through symbolic links and may get stuck in a cycle if there
511 # is a cycle in the file system.
515 for file
in self.files
do
516 var stat
= file
.link_stat
518 ok
= file
.rmdir
and ok
520 ok
= file
.delete
and ok
524 # Delete the directory itself
525 if ok
then ok
= path
.to_cstring
.rmdir
and ok
530 redef fun ==(other
) do return other
isa Path and path
.simplify_path
== other
.path
.simplify_path
531 redef fun hash
do return path
.simplify_path
.hash
534 # Information on a file
536 # Created by `Path::stat` and `Path::link_stat`.
538 # The information within this class is gathered when the instance is initialized
539 # it will not be updated if the targeted file is modified.
545 # The low-level status of a file
548 private var stat
: NativeFileStat
550 private var finalized
= false
554 if not finalized
then
560 # Returns the last access time in seconds since Epoch
561 fun last_access_time
: Int
567 # Returns the last access time
569 # alias for `last_access_time`
570 fun atime
: Int do return last_access_time
572 # Returns the last modification time in seconds since Epoch
573 fun last_modification_time
: Int
579 # Returns the last modification time
581 # alias for `last_modification_time`
582 fun mtime
: Int do return last_modification_time
585 # Size of the file at `path`
592 # Is self a regular file and not a device file, pipe, socket, etc.?
599 # Alias for `is_file`
600 fun is_reg
: Bool do return is_file
602 # Is this a directory?
609 # Is this a symbolic link?
616 # FIXME Make the following POSIX only? or implement in some other way on Windows
618 # Returns the last status change time in seconds since Epoch
619 fun last_status_change_time
: Int
625 # Returns the last status change time
627 # alias for `last_status_change_time`
628 fun ctime
: Int do return last_status_change_time
630 # Returns the permission bits of file
637 # Is this a character device?
644 # Is this a block device?
651 # Is this a FIFO pipe?
658 # Is this a UNIX socket
667 # Access file system related services on the path at `self`
668 fun to_path
: Path do return new Path(to_s
)
672 # return true if a file with this names exists
673 fun file_exists
: Bool do return to_cstring
.file_exists
675 # The status of a file. see POSIX stat(2).
676 fun file_stat
: nullable FileStat
678 var stat
= to_cstring
.file_stat
679 if stat
.address_is_null
then return null
680 return new FileStat(stat
)
683 # The status of a file or of a symlink. see POSIX lstat(2).
684 fun file_lstat
: nullable FileStat
686 var stat
= to_cstring
.file_lstat
687 if stat
.address_is_null
then return null
688 return new FileStat(stat
)
691 # Remove a file, return true if success
692 fun file_delete
: Bool do return to_cstring
.file_delete
694 # Copy content of file at `self` to `dest`
695 fun file_copy_to
(dest
: String) do to_path
.copy
(dest
.to_path
)
697 # Remove the trailing extension `ext`.
699 # `ext` usually starts with a dot but could be anything.
701 # assert "file.txt".strip_extension(".txt") == "file"
702 # assert "file.txt".strip_extension("le.txt") == "fi"
703 # assert "file.txt".strip_extension("xt") == "file.t"
705 # if `ext` is not present, `self` is returned unmodified.
707 # assert "file.txt".strip_extension(".tar.gz") == "file.txt"
708 fun strip_extension
(ext
: String): String
710 if has_suffix
(ext
) then
711 return substring
(0, length
- ext
.length
)
716 # Extract the basename of a path and remove the extension
718 # assert "/path/to/a_file.ext".basename(".ext") == "a_file"
719 # assert "path/to/a_file.ext".basename(".ext") == "a_file"
720 # assert "path/to".basename(".ext") == "to"
721 # assert "path/to/".basename(".ext") == "to"
722 # assert "path".basename("") == "path"
723 # assert "/path".basename("") == "path"
724 # assert "/".basename("") == "/"
725 # assert "".basename("") == ""
726 fun basename
(ext
: String): String
728 var l
= length
- 1 # Index of the last char
729 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
730 if l
== 0 then return "/"
731 var pos
= chars
.last_index_of_from
('/', l
)
734 n
= substring
(pos
+1, l-pos
)
736 return n
.strip_extension
(ext
)
739 # Extract the dirname of a path
741 # assert "/path/to/a_file.ext".dirname == "/path/to"
742 # assert "path/to/a_file.ext".dirname == "path/to"
743 # assert "path/to".dirname == "path"
744 # assert "path/to/".dirname == "path"
745 # assert "path".dirname == "."
746 # assert "/path".dirname == "/"
747 # assert "/".dirname == "/"
748 # assert "".dirname == "."
751 var l
= length
- 1 # Index of the last char
752 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
753 var pos
= chars
.last_index_of_from
('/', l
)
755 return substring
(0, pos
)
756 else if pos
== 0 then
763 # Return the canonicalized absolute pathname (see POSIX function `realpath`)
764 fun realpath
: String do
765 var cs
= to_cstring
.file_realpath
766 var res
= cs
.to_s_with_copy
767 # cs.free_malloc # FIXME memory leak
771 # Simplify a file path by remove useless `.`, removing `//`, and resolving `..`
773 # * `..` are not resolved if they start the path
774 # * starting `.` is simplified unless the path is empty
775 # * starting `/` is not removed
776 # * trailing `/` is removed
778 # Note that the method only work on the string:
780 # * no I/O access is performed
781 # * the validity of the path is not checked
784 # assert "some/./complex/../../path/from/../to/a////file//".simplify_path == "path/to/a/file"
785 # assert "../dir/file".simplify_path == "../dir/file"
786 # assert "dir/../../".simplify_path == ".."
787 # assert "dir/..".simplify_path == "."
788 # assert "//absolute//path/".simplify_path == "/absolute/path"
789 # assert "//absolute//../".simplify_path == "/"
790 # assert "/".simplify_path == "/"
791 # assert "../".simplify_path == ".."
792 # assert "./".simplify_path == "."
793 # assert "././././././".simplify_path == "."
794 # assert "./../dir".simplify_path == "../dir"
795 # assert "./dir".simplify_path == "dir"
797 fun simplify_path
: String
799 var a
= self.split_with
("/")
800 var a2
= new Array[String]
802 if x
== "." and not a2
.is_empty
then continue # skip `././`
803 if x
== "" and not a2
.is_empty
then continue # skip `//`
804 if x
== ".." and not a2
.is_empty
and a2
.last
!= ".." then
805 if a2
.last
== "." then # do not skip `./../`
806 a2
.pop
# reduce `./../` in `../`
807 else # reduce `dir/../` in `/`
811 else if not a2
.is_empty
and a2
.last
== "." then
812 a2
.pop
# reduce `./dir` in `dir`
816 if a2
.is_empty
then return "."
817 if a2
.length
== 1 and a2
.first
== "" then return "/"
821 # Correctly join two path using the directory separator.
823 # Using a standard "{self}/{path}" does not work in the following cases:
826 # * `path` starts with `'/'`.
828 # This method ensures that the join is valid.
830 # assert "hello".join_path("world") == "hello/world"
831 # assert "hel/lo".join_path("wor/ld") == "hel/lo/wor/ld"
832 # assert "".join_path("world") == "world"
833 # assert "hello".join_path("/world") == "/world"
834 # assert "hello/".join_path("world") == "hello/world"
835 # assert "hello/".join_path("/world") == "/world"
837 # Note: You may want to use `simplify_path` on the result.
839 # Note: This method works only with POSIX paths.
840 fun join_path
(path
: String): String
842 if path
.is_empty
then return self
843 if self.is_empty
then return path
844 if path
.chars
[0] == '/' then return path
845 if self.last
== '/' then return "{self}{path}"
846 return "{self}/{path}"
849 # Convert the path (`self`) to a program name.
851 # Ensure the path (`self`) will be treated as-is by POSIX shells when it is
852 # used as a program name. In order to do that, prepend `./` if needed.
854 # assert "foo".to_program_name == "./foo"
855 # assert "/foo".to_program_name == "/foo"
856 # assert "".to_program_name == "./" # At least, your shell will detect the error.
857 fun to_program_name
: String do
858 if self.has_prefix
("/") then
865 # Alias for `join_path`
867 # assert "hello" / "world" == "hello/world"
868 # assert "hel/lo" / "wor/ld" == "hel/lo/wor/ld"
869 # assert "" / "world" == "world"
870 # assert "/hello" / "/world" == "/world"
872 # This operator is quite useful for chaining changes of path.
873 # The next one being relative to the previous one.
877 # var c = "baz/foobar"
878 # assert a/b/c == "/bar/baz/foobar"
879 fun /(path
: String): String do return join_path
(path
)
881 # Returns the relative path needed to go from `self` to `dest`.
883 # assert "/foo/bar".relpath("/foo/baz") == "../baz"
884 # assert "/foo/bar".relpath("/baz/bar") == "../../baz/bar"
886 # If `self` or `dest` is relative, they are considered relatively to `getcwd`.
888 # In some cases, the result is still independent of the current directory:
890 # assert "foo/bar".relpath("..") == "../../.."
892 # In other cases, parts of the current directory may be exhibited:
894 # var p = "../foo/bar".relpath("baz")
895 # var c = getcwd.basename("")
896 # assert p == "../../{c}/baz"
898 # For path resolution independent of the current directory (eg. for paths in URL),
899 # or to use an other starting directory than the current directory,
900 # just force absolute paths:
902 # var start = "/a/b/c/d"
903 # var p2 = (start/"../foo/bar").relpath(start/"baz")
904 # assert p2 == "../../d/baz"
907 # Neither `self` or `dest` has to be real paths or to exist in directories since
908 # the resolution is only done with string manipulations and without any access to
909 # the underlying file system.
911 # If `self` and `dest` are the same directory, the empty string is returned:
913 # assert "foo".relpath("foo") == ""
914 # assert "foo/../bar".relpath("bar") == ""
916 # The empty string and "." designate both the current directory:
918 # assert "".relpath("foo/bar") == "foo/bar"
919 # assert ".".relpath("foo/bar") == "foo/bar"
920 # assert "foo/bar".relpath("") == "../.."
921 # assert "/" + "/".relpath(".") == getcwd
922 fun relpath
(dest
: String): String
925 var from
= (cwd
/self).simplify_path
.split
("/")
926 if from
.last
.is_empty
then from
.pop
# case for the root directory
927 var to
= (cwd
/dest
).simplify_path
.split
("/")
928 if to
.last
.is_empty
then to
.pop
# case for the root directory
930 # Remove common prefixes
931 while not from
.is_empty
and not to
.is_empty
and from
.first
== to
.first
do
936 # Result is going up in `from` with ".." then going down following `to`
937 var from_len
= from
.length
938 if from_len
== 0 then return to
.join
("/")
939 var up
= "../"*(from_len-1
) + ".."
940 if to
.is_empty
then return up
941 var res
= up
+ "/" + to
.join
("/")
945 # Create a directory (and all intermediate directories if needed)
947 # Return an error object in case of error.
949 # assert "/etc/".mkdir != null
950 fun mkdir
: nullable Error
952 var dirs
= self.split_with
("/")
953 var path
= new FlatBuffer
954 if dirs
.is_empty
then return null
955 if dirs
[0].is_empty
then
956 # it was a starting /
959 var error
: nullable Error = null
961 if d
.is_empty
then continue
964 var res
= path
.to_s
.to_cstring
.file_mkdir
965 if not res
and error
== null then
966 error
= new IOError("Cannot create directory `{path}`: {sys.errno.strerror}")
972 # Delete a directory and all of its content, return `true` on success
974 # Does not go through symbolic links and may get stuck in a cycle if there
975 # is a cycle in the filesystem.
977 # Return an error object in case of error.
979 # assert "/fail/does not/exist".rmdir != null
980 fun rmdir
: nullable Error
982 var res
= to_path
.rmdir
983 if res
then return null
984 var error
= new IOError("Cannot change remove `{self}`: {sys.errno.strerror}")
988 # Change the current working directory
991 # assert getcwd == "/etc"
993 # assert getcwd == "/"
995 # Return an error object in case of error.
997 # assert "/etc".chdir == null
998 # assert "/fail/does no/exist".chdir != null
999 # assert getcwd == "/etc" # unchanger
1000 fun chdir
: nullable Error
1002 var res
= to_cstring
.file_chdir
1003 if res
then return null
1004 var error
= new IOError("Cannot change directory to `{self}`: {sys.errno.strerror}")
1008 # Return right-most extension (without the dot)
1010 # Only the last extension is returned.
1011 # There is no special case for combined extensions.
1013 # assert "file.txt".file_extension == "txt"
1014 # assert "file.tar.gz".file_extension == "gz"
1016 # For file without extension, `null` is returned.
1017 # Hoever, for trailing dot, `""` is returned.
1019 # assert "file".file_extension == null
1020 # assert "file.".file_extension == ""
1022 # The starting dot of hidden files is never considered.
1024 # assert ".file.txt".file_extension == "txt"
1025 # assert ".file".file_extension == null
1026 fun file_extension
: nullable String
1028 var last_slash
= chars
.last_index_of
('.')
1029 if last_slash
> 0 then
1030 return substring
( last_slash
+1, length
)
1036 # Returns entries contained within the directory represented by self.
1038 # var files = "/etc".files
1039 # assert files.has("issue")
1041 # Returns an empty array in case of error
1043 # files = "/etc/issue".files
1044 # assert files.is_empty
1046 # TODO find a better way to handle errors and to give them back to the user.
1047 fun files
: Array[String]
1049 var res
= new Array[String]
1050 var d
= new NativeDir.opendir
(to_cstring
)
1051 if d
.address_is_null
then return res
1055 if de
.address_is_null
then break
1056 var name
= de
.to_s_with_copy
1057 if name
== "." or name
== ".." then continue
1066 redef class NativeString
1067 private fun file_exists
: Bool is extern "string_NativeString_NativeString_file_exists_0"
1068 private fun file_stat
: NativeFileStat is extern "string_NativeString_NativeString_file_stat_0"
1069 private fun file_lstat
: NativeFileStat `{
1070 struct stat* stat_element;
1072 stat_element = malloc(sizeof(struct stat));
1073 res = lstat(self, stat_element);
1074 if (res == -1) return NULL;
1075 return stat_element;
1077 private fun file_mkdir
: Bool is extern "string_NativeString_NativeString_file_mkdir_0"
1078 private fun rmdir
: Bool `{ return !rmdir(self); `}
1079 private fun file_delete: Bool is extern "string_NativeString_NativeString_file_delete_0"
1080 private fun file_chdir: Bool is extern "string_NativeString_NativeString_file_chdir_0"
1081 private fun file_realpath: NativeString is extern "file_NativeString_realpath"
1084 # This class is system dependent ... must reify the vfs
1085 private extern class NativeFileStat `{ struct stat * `}
1086 # Returns the permission bits of file
1087 fun mode
: Int is extern "file_FileStat_FileStat_mode_0"
1088 # Returns the last access time
1089 fun atime
: Int is extern "file_FileStat_FileStat_atime_0"
1090 # Returns the last status change time
1091 fun ctime
: Int is extern "file_FileStat_FileStat_ctime_0"
1092 # Returns the last modification time
1093 fun mtime
: Int is extern "file_FileStat_FileStat_mtime_0"
1095 fun size
: Int is extern "file_FileStat_FileStat_size_0"
1097 # Returns true if it is a regular file (not a device file, pipe, sockect, ...)
1098 fun is_reg
: Bool `{ return S_ISREG(self->st_mode); `}
1099 # Returns true if it is a directory
1100 fun is_dir: Bool `{ return S_ISDIR(self->st_mode); `}
1101 # Returns true if it is a character device
1102 fun is_chr
: Bool `{ return S_ISCHR(self->st_mode); `}
1103 # Returns true if it is a block device
1104 fun is_blk: Bool `{ return S_ISBLK(self->st_mode); `}
1105 # Returns true if the type is fifo
1106 fun is_fifo
: Bool `{ return S_ISFIFO(self->st_mode); `}
1107 # Returns true if the type is a link
1108 fun is_lnk: Bool `{ return S_ISLNK(self->st_mode); `}
1109 # Returns true if the type is a socket
1110 fun is_sock
: Bool `{ return S_ISSOCK(self->st_mode); `}
1113 # Instance of this class are standard FILE * pointers
1114 private extern class NativeFile `{ FILE* `}
1115 fun io_read
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_read_2"
1116 fun io_write
(buf
: NativeString, len
: Int): Int is extern "file_NativeFile_NativeFile_io_write_2"
1117 fun write_byte
(value
: Int): Int `{
1118 unsigned char b = (unsigned char)value;
1119 return fwrite(&b, 1, 1, self);
1121 fun io_close
: Int is extern "file_NativeFile_NativeFile_io_close_0"
1122 fun file_stat
: NativeFileStat is extern "file_NativeFile_NativeFile_file_stat_0"
1123 fun fileno
: Int `{ return fileno(self); `}
1124 # Flushes the buffer, forcing the write operation
1125 fun flush: Int is extern "fflush"
1126 # Used to specify how the buffering will be handled for the current stream.
1127 fun set_buffering_type(buf_length: Int, mode: Int): Int is extern "file_NativeFile_NativeFile_set_buffering_type_0"
1129 new io_open_read(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_read_1"
1130 new io_open_write(path: NativeString) is extern "file_NativeFileCapable_NativeFileCapable_io_open_write_1"
1131 new native_stdin is extern "file_NativeFileCapable_NativeFileCapable_native_stdin_0"
1132 new native_stdout is extern "file_NativeFileCapable_NativeFileCapable_native_stdout_0"
1133 new native_stderr is extern "file_NativeFileCapable_NativeFileCapable_native_stderr_0"
1136 # Standard `DIR*` pointer
1137 private extern class NativeDir `{ DIR* `}
1140 new opendir
(path
: NativeString) `{ return opendir(path); `}
1143 fun closedir `{ closedir(self); `}
1145 # Read the next directory entry
1146 fun readdir
: NativeString `{
1149 if (!de) return NULL;
1157 var stdin
: PollableReader = new Stdin is protected writable, lazy
1160 var stdout
: Writer = new Stdout is protected writable, lazy
1162 # Standard output for errors
1163 var stderr
: Writer = new Stderr is protected writable, lazy
1165 # Enumeration for buffer mode full (flushes when buffer is full)
1166 fun buffer_mode_full
: Int is extern "file_Sys_Sys_buffer_mode_full_0"
1167 # Enumeration for buffer mode line (flushes when a `\n` is encountered)
1168 fun buffer_mode_line
: Int is extern "file_Sys_Sys_buffer_mode_line_0"
1169 # Enumeration for buffer mode none (flushes ASAP when something is written)
1170 fun buffer_mode_none
: Int is extern "file_Sys_Sys_buffer_mode_none_0"
1172 # returns first available stream to read or write to
1173 # return null on interruption (possibly a signal)
1174 protected fun poll
( streams
: Sequence[FileStream] ) : nullable FileStream
1176 var in_fds
= new Array[Int]
1177 var out_fds
= new Array[Int]
1178 var fd_to_stream
= new HashMap[Int,FileStream]
1181 if s
isa FileReader then in_fds
.add
( fd
)
1182 if s
isa FileWriter then out_fds
.add
( fd
)
1184 fd_to_stream
[fd
] = s
1187 var polled_fd
= intern_poll
( in_fds
, out_fds
)
1189 if polled_fd
== null then
1192 return fd_to_stream
[polled_fd
]
1196 private fun intern_poll
(in_fds
: Array[Int], out_fds
: Array[Int]) : nullable Int is extern import Array[Int].length
, Array[Int].[], Int.as(nullable Int) `{
1197 int in_len, out_len, total_len;
1198 struct pollfd *c_fds;
1200 int first_polled_fd = -1;
1203 in_len = Array_of_Int_length( in_fds );
1204 out_len = Array_of_Int_length( out_fds );
1205 total_len = in_len + out_len;
1206 c_fds = malloc( sizeof(struct pollfd) * total_len );
1209 for ( i=0; i<in_len; i ++ ) {
1211 fd = Array_of_Int__index( in_fds, i );
1214 c_fds[i].events = POLLIN;
1217 /* output streams */
1218 for ( i=0; i<out_len; i ++ ) {
1220 fd = Array_of_Int__index( out_fds, i );
1223 c_fds[i].events = POLLOUT;
1226 /* poll all fds, unlimited timeout */
1227 result = poll( c_fds, total_len, -1 );
1230 /* analyse results */
1231 for ( i=0; i<total_len; i++ )
1232 if ( c_fds[i].revents & c_fds[i].events || /* awaited event */
1233 c_fds[i].revents & POLLHUP ) /* closed */
1235 first_polled_fd = c_fds[i].fd;
1239 return Int_as_nullable( first_polled_fd );
1241 else if ( result < 0 )
1242 fprintf( stderr, "Error in Stream:poll: %s\n", strerror( errno ) );
1249 # Print `objects` on the standard output (`stdout`).
1250 fun printn
(objects
: Object...)
1252 sys
.stdout
.write
(objects
.plain_to_s
)
1255 # Print an `object` on the standard output (`stdout`) and add a newline.
1256 fun print
(object
: Object)
1258 sys
.stdout
.write
(object
.to_s
)
1259 sys
.stdout
.write
("\n")
1262 # Print `object` on the error output (`stderr` or a log system)
1263 fun print_error
(object
: Object)
1265 sys
.stderr
.write object
.to_s
1266 sys
.stderr
.write
"\n"
1269 # Read a character from the standard input (`stdin`).
1272 var c
= sys
.stdin
.read_char
1273 if c
== null then return '\1'
1277 # Read a line from the standard input (`stdin`).
1280 return sys
.stdin
.read_line
1283 # Return the working (current) directory
1284 fun getcwd
: String do return file_getcwd
.to_s
1285 private fun file_getcwd
: NativeString is extern "string_NativeString_NativeString_file_getcwd_0"