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mercury/library/io.stream_ops.m
Julien Fischer 7c2cf9e946 Rationalise foreign_proc attributes in stdlib. 
library/*.m:
    Remove tabled_for_io attributes from C# and Java foreign_procs.
    I/O tabling is not supported by those backends.

    Remove will_not_modify_trail attributes from C# and Java foreign_procs,
    and from predicates that do I/O. They have no effect in the former and
    cannot affect anything with the latter.

    Fix a spot a where will_not_modify_trail was given, but
    will_not_call_mercury was meant.
2026-02-20 19:19:26 +11:00

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%---------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%---------------------------------------------------------------------------%
% Copyright (C) 1993-2012 The University of Melbourne.
% Copyright (C) 2013-2022, 2025-2026 The Mercury team.
% This file is distributed under the terms specified in COPYING.LIB.
%---------------------------------------------------------------------------%
%
% File: io.stream_ops.m.
% Stability: high.
%
% This file handles the implementation of operations that operate
% on streams as a whole, such as opening and closing streams, reading
% or updating the current offset on streams, and finding some standard streams.
%
% We communicate results from foreign_procs as separate simple arguments
% so the C/Java/C# code does not depend on how Mercury stores its
% discriminated union data types. It also avoids memory allocation in
% inner loops.
%
%---------------------------------------------------------------------------%
%---------------------------------------------------------------------------%
:- module io.stream_ops.
:- interface.
% do_open_text(File, Mode, StreamId, Stream, Error, !IO):
% do_open_binary(File, Mode, StreamId, Stream, Error, !IO):
%
% Attempts to open a file in the specified mode.
% The Mode must be a string suitable for passing to fopen(), and
% - should not have a final "b" when calling do_open_text, but
% - should have a final "b" when calling do_open_binary.
% StreamId will be a unique integer identifying the open.
% StreamId and Stream will be valid only if Error indicates
% that an error has NOT occurred.
%
:- pred do_open_text(string::in, string::in, int::out, stream::out,
system_error::out, io::di, io::uo) is det.
:- pred do_open_binary(string::in, string::in, int::out, stream::out,
system_error::out, io::di, io::uo) is det.
:- pred close_stream(stream::in, system_error::out, io::di, io::uo) is det.
%---------------------%
:- pred whence_to_int(io.whence::in, int::out) is det.
:- pred seek_binary_2(stream::in, int::in, int64::in, system_error::out,
io::di, io::uo) is det.
:- pred binary_stream_offset_2(stream::in, int64::out, system_error::out,
io::di, io::uo) is det.
%---------------------%
:- pred flush_text_output_2(stream::in, system_error::out,
io::di, io::uo) is det.
:- pred flush_binary_output_2(stream::in, system_error::out,
io::di, io::uo) is det.
%---------------------%
:- pred get_input_line_number_2(stream::in, int::out, io::di, io::uo) is det.
:- pred set_input_line_number_2(stream::in, int::in, io::di, io::uo) is det.
:- pred get_output_line_number_2(stream::in, int::out, io::di, io::uo) is det.
:- pred set_output_line_number_2(stream::in, int::in, io::di, io::uo) is det.
%---------------------%
:- func stdin_stream_2 = stream.
:- pred stdin_stream_2(stream::out, io::di, io::uo) is det.
:- pred stdin_binary_stream_2(stream::out, io::di, io::uo) is det.
:- func stdout_stream_2 = stream.
:- pred stdout_stream_2(stream::out, io::di, io::uo) is det.
:- pred stdout_binary_stream_2(stream::out, io::di, io::uo) is det.
:- func stderr_stream_2 = stream.
:- pred stderr_stream_2(stream::out, io::di, io::uo) is det.
:- pred input_stream_2(stream::out, io::di, io::uo) is det.
:- pred binary_input_stream_2(stream::out, io::di, io::uo) is det.
:- pred output_stream_2(stream::out, io::di, io::uo) is det.
:- pred binary_output_stream_2(stream::out, io::di, io::uo) is det.
%---------------------%
:- pred set_input_stream_2(stream::in, stream::out,
io::di, io::uo) is det.
:- pred set_binary_input_stream_2(stream::in, stream::out,
io::di, io::uo) is det.
:- pred set_output_stream_2(stream::in, stream::out,
io::di, io::uo) is det.
:- pred set_binary_output_stream_2(stream::in, stream::out,
io::di, io::uo) is det.
%---------------------------------------------------------------------------%
:- implementation.
%---------------------------------------------------------------------------%
:- pragma foreign_proc("C",
do_open_text(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
Stream = mercury_open(FileName, Mode, MR_ALLOC_ID);
if (Stream != NULL) {
StreamId = mercury_next_stream_id();
Error = 0;
} else {
StreamId = -1;
Error = errno;
}
").
:- pragma foreign_proc("C#",
do_open_text(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
Stream = mercury.io__stream_ops.mercury_open(FileName, Mode,
mercury.io__stream_ops.ML_default_line_ending);
StreamId = Stream.id;
Error = null;
} catch (System.Exception e) {
StreamId = -1;
Stream = null;
Error = e;
}
").
:- pragma foreign_proc("Java",
do_open_text(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
try {
switch (Mode.charAt(0)) {
case 'r':
Stream = new jmercury.io__stream_ops.MR_TextInputFile(
new java.io.FileInputStream(FileName));
break;
case 'w':
Stream = new jmercury.io__stream_ops.MR_TextOutputFile(
new java.io.FileOutputStream(FileName));
break;
case 'a':
Stream = new jmercury.io__stream_ops.MR_TextOutputFile(
new java.io.FileOutputStream(FileName, true));
break;
default:
throw new RuntimeException(""Invalid file opening mode: "" +
Mode);
}
StreamId = Stream.id;
Error = null;
} catch (java.lang.Exception e) {
Stream = null;
StreamId = -1;
Error = e;
}
").
%---------------------%
:- pragma foreign_proc("C",
do_open_binary(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
Stream = mercury_open(FileName, Mode, MR_ALLOC_ID);
if (Stream != NULL) {
StreamId = mercury_next_stream_id();
Error = 0;
} else {
StreamId = -1;
Error = errno;
}
").
:- pragma foreign_proc("C#",
do_open_binary(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
Stream = mercury.io__stream_ops.mercury_open(FileName, Mode,
mercury.io__stream_ops.ML_line_ending_kind.ML_raw_binary);
StreamId = Stream.id;
Error = null;
} catch (System.Exception e) {
StreamId = -1;
Stream = null;
Error = e;
}
").
:- pragma foreign_proc("Java",
do_open_binary(FileName::in, Mode::in, StreamId::out, Stream::out,
Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
try {
switch (Mode.charAt(0)) {
case 'r':
Stream = new jmercury.io__stream_ops.MR_BinaryInputFile(
new java.io.FileInputStream(FileName));
break;
case 'w':
Stream = new jmercury.io__stream_ops.MR_BinaryOutputFile(
new java.io.FileOutputStream(FileName));
break;
case 'a':
Stream = new jmercury.io__stream_ops.MR_BinaryOutputFile(
new java.io.FileOutputStream(FileName, true));
break;
default:
throw new RuntimeException(""Invalid file opening mode: "" +
Mode);
}
StreamId = Stream.id;
Error = null;
} catch (java.lang.Exception e) {
Stream = null;
StreamId = -1;
Error = e;
}
").
%---------------------%
:- pragma foreign_proc("C",
close_stream(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
if (mercury_close(Stream) < 0) {
Error = errno;
} else {
Error = 0;
}
").
:- pragma foreign_proc("C#",
close_stream(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
mercury.io__stream_ops.mercury_close(Stream);
Error = null;
} catch (System.Exception e) {
Error = e;
}
").
:- pragma foreign_proc("Java",
close_stream(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
try {
Stream.close();
Error = null;
} catch (java.io.IOException e) {
Error = e;
}
").
%---------------------------------------------------------------------------%
whence_to_int(set, 0).
whence_to_int(cur, 1).
whence_to_int(end, 2).
%---------------------%
:- pragma foreign_proc("C",
seek_binary_2(Stream::in, Flag::in, Off::in, Error::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
static const int seek_flags[] = { SEEK_SET, SEEK_CUR, SEEK_END };
// XXX check if the stream is seekable.
if (MR_IS_FILE_STREAM(*Stream)) {
if (MR_fseek(MR_file(*Stream), Off, seek_flags[Flag]) < 0) {
Error = errno;
} else {
Error = 0;
}
} else {
Error = EINVAL;
}
").
% MISSING C# seek_binary_2
:- pragma foreign_proc("Java",
seek_binary_2(Stream::in, Flag::in, Off::in, Error::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
((jmercury.io__stream_ops.MR_BinaryFile) Stream).seek_binary(
Flag, Off);
Error = null;
} catch (java.io.IOException e) {
Error = e;
}
").
%---------------------%
:- pragma foreign_proc("C",
binary_stream_offset_2(Stream::in, Offset::out, Error::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
// XXX should check if the stream is tellable
if (MR_IS_FILE_STREAM(*Stream)) {
Offset = MR_ftell(MR_file(*Stream));
if (Offset < 0) {
Error = errno;
} else {
Error = 0;
}
} else {
Error = EINVAL;
}
").
% MISSING C# binary_stream_offset_2
:- pragma foreign_proc("Java",
binary_stream_offset_2(Stream::in, Offset::out, Error::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
Offset = ((jmercury.io__stream_ops.MR_BinaryFile) Stream).getOffset();
Error = null;
} catch (java.io.IOException e) {
Offset = -1;
Error = e;
}
").
%---------------------------------------------------------------------------%
%
% The implementations of flush_text_output_2 and flush_binary_output_2
% are identical for C and C#, but they differ in Java: one casts the stream
% to MR_TextOutputFile, the other to MR_BinaryOutputFile.
%
:- pragma foreign_proc("C",
flush_text_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
if (MR_FLUSH(*Stream) < 0) {
Error = errno;
} else {
Error = 0;
}
").
:- pragma foreign_proc("C#",
flush_text_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
Stream.stream.Flush();
Error = null;
} catch (System.SystemException e) {
Error = e;
}
").
:- pragma foreign_proc("Java",
flush_text_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
((jmercury.io__stream_ops.MR_TextOutputFile) Stream).flush();
Error = null;
} catch (java.io.IOException e) {
Error = e;
}
").
:- pragma foreign_proc("C",
flush_binary_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
"
if (MR_FLUSH(*Stream) < 0) {
Error = errno;
} else {
Error = 0;
}
").
:- pragma foreign_proc("C#",
flush_binary_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
Stream.stream.Flush();
Error = null;
} catch (System.SystemException e) {
Error = e;
}
").
:- pragma foreign_proc("Java",
flush_binary_output_2(Stream::in, Error::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
try {
((jmercury.io__stream_ops.MR_BinaryOutputFile) Stream).flush();
Error = null;
} catch (java.io.IOException e) {
Error = e;
}
").
%---------------------------------------------------------------------------%
%
% The implementations of get_input_line_number_2 and get_output_line_number_2
% are identical for C and C#, but they differ in Java: one casts the stream
% to MR_TextInputFile, the other to MR_TextOutputFile. Likewise for the
% predicates that set the line number.
%
:- pragma foreign_proc("C",
get_input_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io,
does_not_affect_liveness, no_sharing],
"
LineNum = MR_line_number(*Stream);
").
:- pragma foreign_proc("C#",
get_input_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
LineNum = Stream.line_number;
").
:- pragma foreign_proc("Java",
get_input_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
LineNum = ((jmercury.io__stream_ops.MR_TextInputFile) Stream).line_number;
").
:- pragma foreign_proc("C",
set_input_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io,
does_not_affect_liveness, no_sharing],
"
MR_line_number(*Stream) = LineNum;
").
:- pragma foreign_proc("C#",
set_input_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"{
Stream.line_number = LineNum;
}").
:- pragma foreign_proc("Java",
set_input_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
((jmercury.io__stream_ops.MR_TextInputFile) Stream).line_number = LineNum;
").
%---------------------%
:- pragma foreign_proc("C",
get_output_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io,
does_not_affect_liveness, no_sharing],
"
LineNum = MR_line_number(*Stream);
").
:- pragma foreign_proc("C#",
get_output_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"{
LineNum = Stream.line_number;
}").
:- pragma foreign_proc("Java",
get_output_line_number_2(Stream::in, LineNum::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
LineNum = ((jmercury.io__stream_ops.MR_TextOutputFile) Stream).line_number;
").
:- pragma foreign_proc("C",
set_output_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io,
does_not_affect_liveness, no_sharing],
"
MR_line_number(*Stream) = LineNum;
").
:- pragma foreign_proc("C#",
set_output_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"{
Stream.line_number = LineNum;
}").
:- pragma foreign_proc("Java",
set_output_line_number_2(Stream::in, LineNum::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
((jmercury.io__stream_ops.MR_TextOutputFile) Stream).line_number = LineNum;
").
%---------------------------------------------------------------------------%
:- pragma foreign_export("C", stdin_stream_2(out, di, uo),
"ML_io_stdin_stream").
:- pragma foreign_export("C", stdout_stream_2(out, di, uo),
"ML_io_stdout_stream").
:- pragma foreign_export("C", stderr_stream_2(out, di, uo),
"ML_io_stderr_stream").
%---------------------%
:- pragma foreign_proc("C",
stdin_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = &mercury_stdin;
").
:- pragma foreign_proc("C#",
stdin_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = mercury.io__stream_ops.mercury_stdin;
").
:- pragma foreign_proc("Java",
stdin_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = jmercury.io__stream_ops.mercury_stdin;
").
%---------------------%
stdin_stream_2(Stream, !IO) :-
Stream = stdin_stream_2.
%---------------------%
:- pragma foreign_proc("C",
stdin_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = &mercury_stdin_binary;
").
:- pragma foreign_proc("C#",
stdin_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
Stream = mercury.io__stream_ops.mercury_stdin_binary;
").
:- pragma foreign_proc("Java",
stdin_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
jmercury.io__stream_ops.ensure_init_mercury_stdin_binary();
Stream = jmercury.io__stream_ops.mercury_stdin_binary;
").
%---------------------%
:- pragma foreign_proc("C",
stdout_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = &mercury_stdout;
").
:- pragma foreign_proc("C#",
stdout_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = mercury.io__stream_ops.mercury_stdout;
").
:- pragma foreign_proc("Java",
stdout_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = jmercury.io__stream_ops.mercury_stdout;
").
%---------------------%
stdout_stream_2(Stream, !IO) :-
Stream = stdout_stream_2.
%---------------------%
:- pragma foreign_proc("C",
stdout_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = &mercury_stdout_binary;
").
:- pragma foreign_proc("C#",
stdout_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
Stream = mercury.io__stream_ops.mercury_stdout_binary;
").
:- pragma foreign_proc("Java",
stdout_binary_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, may_not_duplicate],
"
jmercury.io__stream_ops.ensure_init_mercury_stdout_binary();
Stream = jmercury.io__stream_ops.mercury_stdout_binary;
").
%---------------------%
:- pragma foreign_proc("C",
stderr_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = &mercury_stderr;
").
:- pragma foreign_proc("C#",
stderr_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = mercury.io__stream_ops.mercury_stderr;
").
:- pragma foreign_proc("Java",
stderr_stream_2 = (Stream::out),
[will_not_call_mercury, promise_pure, thread_safe,
does_not_affect_liveness],
"
Stream = jmercury.io__stream_ops.mercury_stderr;
").
%---------------------%
stderr_stream_2(Stream, !IO) :-
Stream = stderr_stream_2.
%---------------------%
:- pragma foreign_proc("C",
input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = mercury_current_text_input();
").
:- pragma foreign_proc("C#",
input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
Stream = mercury.io__stream_ops.mercury_current_text_input;
").
:- pragma foreign_proc("Java",
input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, may_not_duplicate],
"
Stream = jmercury.io__stream_ops.mercury_current_text_input.get();
").
%---------------------%
:- pragma foreign_proc("C",
binary_input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = mercury_current_binary_input();
").
:- pragma foreign_proc("C#",
binary_input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
Stream = mercury.io__stream_ops.mercury_current_binary_input;
").
:- pragma foreign_proc("Java",
binary_input_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, may_not_duplicate],
"
Stream = jmercury.io__stream_ops.mercury_current_binary_input.get();
").
%---------------------%
:- pragma foreign_proc("C",
output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = mercury_current_text_output();
").
:- pragma foreign_proc("C#",
output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
Stream = mercury.io__stream_ops.mercury_current_text_output;
").
:- pragma foreign_proc("Java",
output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, may_not_duplicate],
"
Stream = jmercury.io__stream_ops.mercury_current_text_output.get();
").
%---------------------%
:- pragma foreign_proc("C",
binary_output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
Stream = mercury_current_binary_output();
").
:- pragma foreign_proc("C#",
binary_output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
Stream = mercury.io__stream_ops.mercury_current_binary_output;
").
:- pragma foreign_proc("Java",
binary_output_stream_2(Stream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, may_not_duplicate],
"
Stream = jmercury.io__stream_ops.mercury_current_binary_output.get();
").
%---------------------------------------------------------------------------%
:- pragma foreign_proc("C",
set_input_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
OutStream = mercury_current_text_input();
MR_set_thread_local_mutable(MercuryFilePtr, NewStream,
mercury_current_text_input_index);
").
:- pragma foreign_proc("C#",
set_input_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = mercury.io__stream_ops.mercury_current_text_input;
mercury.io__stream_ops.mercury_current_text_input = NewStream;
").
:- pragma foreign_proc("Java",
set_input_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = jmercury.io__stream_ops.mercury_current_text_input.get();
jmercury.io__stream_ops.mercury_current_text_input.set(
(jmercury.io__stream_ops.MR_TextInputFile) NewStream);
").
%---------------------%
:- pragma foreign_proc("C",
set_binary_input_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
OutStream = mercury_current_binary_input();
MR_set_thread_local_mutable(MercuryFilePtr, NewStream,
mercury_current_binary_input_index);
").
:- pragma foreign_proc("C#",
set_binary_input_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = mercury.io__stream_ops.mercury_current_binary_input;
mercury.io__stream_ops.mercury_current_binary_input = NewStream;
").
:- pragma foreign_proc("Java",
set_binary_input_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = jmercury.io__stream_ops.mercury_current_binary_input.get();
jmercury.io__stream_ops.mercury_current_binary_input.set(
(jmercury.io__stream_ops.MR_BinaryInputFile) NewStream);
").
%---------------------%
:- pragma foreign_proc("C",
set_output_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
OutStream = mercury_current_text_output();
MR_set_thread_local_mutable(MercuryFilePtr, NewStream,
mercury_current_text_output_index);
").
:- pragma foreign_proc("C#",
set_output_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = mercury.io__stream_ops.mercury_current_text_output;
mercury.io__stream_ops.mercury_current_text_output = NewStream;
").
:- pragma foreign_proc("Java",
set_output_stream_2(NewStream::in, OutStream::out, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = jmercury.io__stream_ops.mercury_current_text_output.get();
jmercury.io__stream_ops.mercury_current_text_output.set(
(jmercury.io__stream_ops.MR_TextOutputFile) NewStream);
").
%---------------------%
:- pragma foreign_proc("C",
set_binary_output_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe, tabled_for_io,
does_not_affect_liveness, no_sharing],
% no_sharing: as a value of a foreign type, an io.stream cannot be reused.
"
OutStream = mercury_current_binary_output();
MR_set_thread_local_mutable(MercuryFilePtr, NewStream,
mercury_current_binary_output_index);
").
:- pragma foreign_proc("C#",
set_binary_output_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = mercury.io__stream_ops.mercury_current_binary_output;
mercury.io__stream_ops.mercury_current_binary_output = NewStream;
").
:- pragma foreign_proc("Java",
set_binary_output_stream_2(NewStream::in, OutStream::out,
_IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure],
"
OutStream = jmercury.io__stream_ops.mercury_current_binary_output.get();
jmercury.io__stream_ops.mercury_current_binary_output.set(
(jmercury.io__stream_ops.MR_BinaryOutputFile) NewStream);
").
%---------------------------------------------------------------------------%
:- pragma foreign_decl("C", "
#if defined(MR_WIN32)
#include ""mercury_string.h"" // For MR_utf8_to_wide.
#endif
extern MercuryFile mercury_stdin;
extern MercuryFile mercury_stdout;
extern MercuryFile mercury_stderr;
extern MercuryFile mercury_stdin_binary;
extern MercuryFile mercury_stdout_binary;
extern MR_Unsigned mercury_current_text_input_index;
extern MR_Unsigned mercury_current_text_output_index;
extern MR_Unsigned mercury_current_binary_input_index;
extern MR_Unsigned mercury_current_binary_output_index;
// A counter used to generate unique stream ids.
extern int ML_next_stream_id;
#ifdef MR_THREAD_SAFE
extern MercuryLock ML_io_next_stream_id_lock;
#endif
MercuryFilePtr mercury_current_text_input(void);
MercuryFilePtr mercury_current_text_output(void);
MercuryFilePtr mercury_current_binary_input(void);
MercuryFilePtr mercury_current_binary_output(void);
int mercury_next_stream_id(void);
MercuryFilePtr mercury_open(const char *filename,
const char *openmode,
MR_AllocSiteInfoPtr alloc_id);
int mercury_close(MercuryFilePtr mf);
").
:- pragma foreign_code("C", "
MercuryFile mercury_stdin;
MercuryFile mercury_stdout;
MercuryFile mercury_stderr;
MercuryFile mercury_stdin_binary;
MercuryFile mercury_stdout_binary;
MR_Unsigned mercury_current_text_input_index;
MR_Unsigned mercury_current_text_output_index;
MR_Unsigned mercury_current_binary_input_index;
MR_Unsigned mercury_current_binary_output_index;
int ML_next_stream_id;
#ifdef MR_THREAD_SAFE
MercuryLock ML_io_next_stream_id_lock;
#endif
MercuryFilePtr
mercury_current_text_input(void)
{
MercuryFilePtr stream;
MR_get_thread_local_mutable(MercuryFilePtr, stream,
mercury_current_text_input_index);
return stream;
}
MercuryFilePtr
mercury_current_text_output(void)
{
MercuryFilePtr stream;
MR_get_thread_local_mutable(MercuryFilePtr, stream,
mercury_current_text_output_index);
return stream;
}
MercuryFilePtr
mercury_current_binary_input(void)
{
MercuryFilePtr stream;
MR_get_thread_local_mutable(MercuryFilePtr, stream,
mercury_current_binary_input_index);
return stream;
}
MercuryFilePtr
mercury_current_binary_output(void)
{
MercuryFilePtr stream;
MR_get_thread_local_mutable(MercuryFilePtr, stream,
mercury_current_binary_output_index);
return stream;
}
int
mercury_next_stream_id(void)
{
int id;
// XXX We don't know whether the new stream is text or binary.
MR_LOCK(&ML_io_next_stream_id_lock, ""io.do_open_text"");
id = ML_next_stream_id++;
MR_UNLOCK(&ML_io_next_stream_id_lock, ""io.do_open_text"");
return id;
}
MercuryFilePtr
mercury_open(const char *filename, const char *openmode,
MR_AllocSiteInfoPtr alloc_id)
{
MercuryFilePtr mf;
FILE *f;
#ifdef MR_WIN32
f = _wfopen(MR_utf8_to_wide(filename), MR_utf8_to_wide(openmode));
#else
f = fopen(filename, openmode);
#endif
if (f == NULL) {
return NULL;
}
// Check if the opened file is actually a directory.
// If fileno or fstat are not available then we assume the OS would not
// let us open a directory as a file anyway.
#if defined(MR_HAVE_FSTAT) && \
(defined(MR_HAVE_FILENO) || defined(fileno)) && defined(S_ISDIR)
{
struct stat stat_info;
int stat_errno;
if (0 != fstat(fileno(f), &stat_info)) {
stat_errno = errno;
fclose(f);
errno = stat_errno;
return NULL;
}
if (S_ISDIR(stat_info.st_mode)) {
fclose(f);
errno = EISDIR;
return NULL;
}
}
#endif
mf = MR_GC_NEW_ATTRIB(MercuryFile, alloc_id);
MR_mercuryfile_init(f, 1, mf);
return mf;
}
#ifdef EBADF
#define MR_CLOSED_FILE_ERROR EBADF
#else
// ANSI/ISO C guarantees that EDOM will exist.
#define MR_CLOSED_FILE_ERROR EDOM
#endif
#ifdef MR_NEW_MERCURYFILE_STRUCT
static int
ME_closed_stream_close(MR_StreamInfo *info)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_read(MR_StreamInfo *info, void *buffer, size_t size)
{
errno = MR_CLOSED_FILE_ERROR;
return -1; // XXX should this be 0?
}
static int
ME_closed_stream_write(MR_StreamInfo *info, const void *buffer, size_t size)
{
errno = MR_CLOSED_FILE_ERROR;
return -1; // XXX should this be 0?
}
static int
ME_closed_stream_flush(MR_StreamInfo *info)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_ungetch(MR_StreamInfo *info, int ch)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_getch(MR_StreamInfo *info)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_vfprintf(MR_StreamInfo *info, const char *format, va_list ap)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_putch(MR_StreamInfo *info, int ch)
{
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
static int
ME_closed_stream_ferror(MR_StreamInfo *info)
{
return 0;
}
static const MercuryFile MR_closed_stream = {
/* stream_type = */ MR_USER_STREAM,
/* stream_info = */ { NULL },
/* line_number = */ 0,
/* close = */ ME_closed_stream_close,
/* read = */ ME_closed_stream_read,
/* write = */ ME_closed_stream_write,
/* flush = */ ME_closed_stream_flush,
/* ungetc = */ ME_closed_stream_ungetch,
/* getc = */ ME_closed_stream_getch,
/* vprintf = */ ME_closed_stream_vfprintf,
/* putc = */ ME_closed_stream_putch,
/* ferror = */ ME_closed_stream_ferror
};
#endif // MR_NEW_MERCURYFILE_STRUCT
int
mercury_close(MercuryFilePtr mf)
{
// On some systems, attempting to close a file stream that has been
// previously closed will lead to a segmentation fault. We check that
// we have not previously closed the file stream here, so we can give
// the user some idea about what has happened.
if (MR_file(*mf) == NULL) {
errno = MR_CLOSED_FILE_ERROR;
return EOF;
}
if (MR_CLOSE(*mf) < 0) {
return EOF;
}
#ifdef MR_NEW_MERCURYFILE_STRUCT
// MR_closed_stream is a dummy stream object containing pointers to
// functions that always return an error indication. Doing this ensures
// that future accesses to the file will fail nicely.
// gcc 2.95.2 barfs on `*mf = MR_closed_stream;'
// so we use MR_memcpy() instead.
MR_memcpy(mf, &MR_closed_stream, sizeof(*mf));
// XXX It would be nice to have an autoconf check for the GNU libc function
// fopencookie(); we could use that to do a similar thing to what we do
// in the MR_NEW_MERCURYFILE_STRUCT case.
/****
#elif defined(HAVE_FOPENCOOKIE)
MR_file(*mf) = MR_closed_file;
****/
#else
// We want future accesses to the file to fail nicely. Ideally they would
// throw an exception, but that would require a check at every I/O
// operation, and for simple operations like putchar() or getchar(),
// that would be too expensive. Instead we just set the file pointer
// to NULL; on systems which trap null pointer dereferences, or if
// library/io.m is compiled with MR_assert assertions enabled
// (i.e. -DMR_LOWLEVEL_DEBUG), this will ensure that accessing closed files
// traps immediately rather than causing problems at some later point.
MR_mercuryfile_init(NULL, 0, mf);
#endif // ! MR_NEW_MERCURYFILE_STRUCT
#ifndef MR_CONSERVATIVE_GC
if (mf == &mercury_stdin ||
mf == &mercury_stdout ||
mf == &mercury_stderr ||
mf == &mercury_stdin_binary ||
mf == &mercury_stdout_binary)
{
// The memory for these streams is allocated statically,
// so there is nothing to free.
} else {
// For the accurate GC or no GC cases, we need to explicitly deallocate
// the memory here, to avoid a memory leak. Note that the accurate
// collector will not reclaim io_streams, since the io.stream type
// is defined as a foreign_type.
MR_GC_free(mf);
}
#endif // !MR_CONSERVATIVE_GC
return 0;
}
").
%---------------------------------------------------------------------------%
:- pragma foreign_code("Java", "
// While strings are stored internally as UTF-16, all text file I/O
// (including stdin/stdout/stderr) is run through stream readers/writers
// that use UTF-8 encoding.
// Binary files are opened via RandomAccessFile, which supports seek,
// but not character encoding/decoding or buffering.
// Binary stdin and stdout are a special case. They are opened via
// FileInput/OutputStreams and seeking is controlled through use of
// FileChannels.
//
// The use of the methods in this implementation is not very flexible.
// You may not perform text mode operations on a binary file or vice versa.
// XXX This causes problems for io.read_binary and io.write_binary,
// for which the current implementations attempt to access binary
// streams using text mode operations (and so will definitely break.)
public abstract static class MR_MercuryFileStruct {
public static int ML_next_stream_id = 0;
public int id;
protected MR_MercuryFileStruct() {
assign_id();
}
private synchronized void assign_id() {
id = ML_next_stream_id++;
}
abstract public void close() throws java.io.IOException;
}
public static class MR_TextInputFile
extends MR_MercuryFileStruct
{
private java.io.InputStreamReader input = null;
private char[] buf = new char[1024];
private int buf_pos = 0;
private int buf_end = 0;
public int line_number = 1;
public MR_TextInputFile(java.io.InputStream stream) {
input = new java.io.InputStreamReader(stream,
java.nio.charset.StandardCharsets.UTF_8);
}
// refill_buffer():
// Returns true if the end of the stream has not been reached.
private boolean refill_buffer()
throws java.io.IOException
{
if (buf_end == buf_pos) {
int n = input.read(buf, 0, buf.length);
if (n == -1) {
return false;
}
buf_end = n;
buf_pos = 0;
}
return true;
}
private int read_code_unit()
throws java.io.IOException
{
if (!refill_buffer()) {
return -1;
}
char c = buf[buf_pos];
buf_pos++;
return (int) c;
}
// read_char(): [Java]
//
// Reads one character in from a text input file using the default
// charset decoding. Returns -1 at end of file.
public int read_char()
throws java.io.IOException
{
final int c1 = read_code_unit();
if (c1 == -1) {
return -1;
}
if (c1 == '\\n') {
line_number++;
}
if (!Character.isHighSurrogate((char) c1)) {
return c1;
}
final int c2 = read_code_unit();
if (c2 != -1 && !Character.isLowSurrogate((char) c2)) {
// Return replacement character.
return 0xfffd;
}
return Character.toCodePoint((char) c1, (char) c2);
}
// read_line(): [Java]
//
// Reads in a line of a text input file using the default
// charset decoding. Returns null at end of file.
public String read_line()
throws java.io.IOException
{
if (!refill_buffer()) {
return null;
}
// Often, the buffer already contains a complete line.
for (int i = buf_pos; i < buf_end; i++) {
if (buf[i] == '\\n') {
String s = new String(buf, buf_pos, i - buf_pos + 1);
buf_pos = i + 1;
line_number++;
return s;
}
}
// The buffer doesn't contain a complete line.
StringBuilder sb = new StringBuilder();
sb.append(buf, buf_pos, buf_end - buf_pos);
buf_pos = buf_end;
while (refill_buffer()) {
for (int i = buf_pos; i < buf_end; i++) {
if (buf[i] == '\\n') {
sb.append(buf, buf_pos, i - buf_pos + 1);
buf_pos = i + 1;
line_number++;
return sb.toString();
}
}
sb.append(buf, buf_pos, buf_end - buf_pos);
buf_pos = buf_end;
}
return sb.toString();
}
// read_file(): [Java]
//
// Reads in the rest of a text input file using the default
// charset decoding.
public void read_file(StringBuilder sb)
throws java.io.IOException
{
int n;
sb.append(buf, buf_pos, buf_end - buf_pos);
buf_pos = buf_end;
while ((n = input.read(buf)) > -1) {
for (int i = 0; i < n; i++) {
if (buf[i] == '\\n') {
line_number++;
}
}
sb.append(buf, 0, n);
}
}
private void unget_code_unit(char c) {
// If necessary, shift the unread characters in the input buffer
// to make room at the front of the buffer. If the buffer is full,
// allocate a bigger buffer.
if (buf_pos == 0) {
if (buf_end < buf.length) {
int offset = buf.length - buf_end;
System.arraycopy(buf, 0, buf, offset, buf_end);
buf_pos = offset;
buf_end = buf.length;
} else {
char[] new_buf = new char[buf.length * 2];
int offset = new_buf.length - buf_end;
System.arraycopy(buf, 0, new_buf, offset, buf_end);
buf = new_buf;
buf_pos = offset;
buf_end = new_buf.length;
}
}
buf[--buf_pos] = c;
}
public void ungetc(int c) {
if (Character.charCount(c) == 1) {
unget_code_unit((char) c);
if (c == '\\n') {
line_number--;
}
} else {
char[] units = Character.toChars(c);
unget_code_unit(units[1]);
unget_code_unit(units[0]);
}
}
@Override
public void close()
throws java.io.IOException
{
input.close();
}
} // class MR_TextInputFile
public static class MR_TextOutputFile
extends MR_MercuryFileStruct
{
private java.io.BufferedWriter output = null;
public int line_number = 1;
public MR_TextOutputFile(java.io.OutputStream stream) {
output = new java.io.BufferedWriter(
new java.io.OutputStreamWriter(stream,
java.nio.charset.StandardCharsets.UTF_8));
}
public void put(char c)
throws java.io.IOException
{
output.write(c);
if (c == '\\n') {
output.flush();
line_number++;
}
}
public void write(java.lang.String s)
throws java.io.IOException
{
output.write(s);
int old_line_number = line_number;
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == '\\n') {
line_number++;
}
}
// Flush if we saw a newline.
if (old_line_number != line_number) {
output.flush();
}
}
public void flush()
throws java.io.IOException
{
output.flush();
}
@Override
public void close()
throws java.io.IOException
{
output.close();
}
} // class MR_TextOutputFile
public abstract static class MR_BinaryFile
extends MR_MercuryFileStruct
{
// These must match whence_to_int.
protected static final int SEEK_SET = 0;
protected static final int SEEK_CUR = 1;
protected static final int SEEK_END = 2;
// channel is used for positioning the stream. Read/write operations
// use randomaccess, binary_input, binary_output instead.
protected java.nio.channels.FileChannel channel = null;
// size(): [Java]
//
// Returns the length of a file.
public long size()
throws java.io.IOException
{
return channel.size();
}
// getOffset():
//
// Returns the current position in a binary file.
abstract public long getOffset() throws java.io.IOException;
// seek(): [Java]
//
// Seek relative to start, current position or end depending on the
// flag.
public void seek_binary(int flag, long offset)
throws java.io.IOException
{
long position;
switch (flag) {
case SEEK_SET:
position = offset;
break;
case SEEK_CUR:
position = getOffset() + offset;
break;
case SEEK_END:
position = size() + offset;
break;
default:
throw new java.lang.
RuntimeException(""Invalid seek flag"");
}
channel.position(position);
}
}
public static class MR_BinaryInputFile
extends MR_BinaryFile
{
private java.io.FileInputStream binary_input = null;
protected java.util.Stack<Byte> pushback
= new java.util.Stack<Byte>();
public MR_BinaryInputFile(java.io.FileInputStream in) {
this.binary_input = in;
this.channel = in.getChannel();
}
// read_byte(): [Java]
//
// Reads one byte in from a binary file. Returns -1 at end of file.
public int read_byte()
throws java.io.IOException
{
int c;
if (pushback.empty()) {
c = binary_input.read();
} else {
c = pushback.pop() & 0xff; // make unsigned
}
return c;
}
public void ungetc(byte b) {
pushback.push(b);
}
public int read_pushback(byte[] b, int start, int len)
{
final int end = start + len;
int cur = start;
while (cur < end && !pushback.empty()) {
b[cur] = pushback.pop();
cur++;
}
return cur - start;
}
public int read_non_pushback(byte[] b, int start, int len)
throws java.io.IOException
{
int n = binary_input.read(b, start, len);
if (n < 0) {
return 0;
}
return n;
}
@Override
public long getOffset()
throws java.io.IOException
{
return channel.position() - pushback.size();
}
@Override
public void seek_binary(int flag, long offset)
throws java.io.IOException
{
super.seek_binary(flag, offset);
pushback = new java.util.Stack<Byte>();
}
@Override
public void close()
throws java.io.IOException
{
binary_input.close();
}
}
public static class MR_BinaryOutputFile
extends MR_BinaryFile
{
private java.io.FileOutputStream binary_output = null;
public MR_BinaryOutputFile(java.io.FileOutputStream out) {
this.binary_output = out;
this.channel = out.getChannel();
}
public void put(byte b)
throws java.io.IOException
{
binary_output.write(b);
}
// Obsolete.
public void write(java.lang.String s)
throws java.io.IOException
{
for (int i = 0; i < s.length(); i++) {
// lower 8 bits of each
put((byte) s.charAt(i));
}
}
public void write(byte[] bs, int start, int length)
throws java.io.IOException
{
binary_output.write(bs, start, length);
}
public void flush()
throws java.io.IOException
{
binary_output.flush();
}
@Override
public long getOffset()
throws java.io.IOException
{
return (int) channel.position();
}
@Override
public void close()
throws java.io.IOException
{
binary_output.close();
}
}
public static MR_TextInputFile mercury_stdin =
new MR_TextInputFile(java.lang.System.in);
public static MR_TextOutputFile mercury_stdout =
new MR_TextOutputFile(java.lang.System.out);
public static MR_TextOutputFile mercury_stderr =
new MR_TextOutputFile(java.lang.System.err);
// We initialize mercury_stdin_binary and mercury_stdout_binary
// only when they are needed, because the initialization code
// does not work on Google's App Engine.
public static MR_BinaryInputFile mercury_stdin_binary = null;
public static MR_BinaryOutputFile mercury_stdout_binary = null;
public static void ensure_init_mercury_stdin_binary() {
if (mercury_stdin_binary == null) {
mercury_stdin_binary = new MR_BinaryInputFile(
new java.io.FileInputStream(java.io.FileDescriptor.in));
}
}
public static void ensure_init_mercury_stdout_binary() {
if (mercury_stdout_binary == null) {
mercury_stdout_binary = new MR_BinaryOutputFile(
new java.io.FileOutputStream(java.io.FileDescriptor.out));
}
}
// Note: these are also set in io.init_state.
public static ThreadLocal<MR_TextInputFile> mercury_current_text_input =
new InheritableThreadLocal<MR_TextInputFile>() {
protected MR_TextInputFile initialValue() {
return mercury_stdin;
}
};
public static ThreadLocal<MR_TextOutputFile> mercury_current_text_output =
new InheritableThreadLocal<MR_TextOutputFile>() {
protected MR_TextOutputFile initialValue() {
return mercury_stdout;
}
};
public static ThreadLocal<MR_BinaryInputFile> mercury_current_binary_input =
new InheritableThreadLocal<MR_BinaryInputFile>() {
protected MR_BinaryInputFile initialValue() {
ensure_init_mercury_stdin_binary();
return mercury_stdin_binary;
}
};
public static ThreadLocal<MR_BinaryOutputFile> mercury_current_binary_output =
new InheritableThreadLocal<MR_BinaryOutputFile>() {
protected MR_BinaryOutputFile initialValue() {
ensure_init_mercury_stdout_binary();
return mercury_stdout_binary;
}
};
").
%---------------------------------------------------------------------------%
:- pragma foreign_code("C#", "
// The ML_ prefixes here are not really needed,
// since the C# code all gets generated inside a class,
// but we keep them for consistency with the C code.
// A counter used to generate unique stream ids.
static int ML_next_stream_id;
public enum ML_line_ending_kind {
// File uses the usual line-ending convention
// for the OS (e.g. CR-LF for DOS/Windows).
ML_OS_line_ending,
// File uses the Unix line-encoding convention.
ML_Unix_line_ending,
// File stores bytes.
ML_raw_binary
};
// This specifies the default encoding used for text files.
// It must be either ML_OS_text_encoding or ML_Unix_text_encoding.
//
// XXX The initial setting for this should be controlled
// by an environment variable. (This might require moving
// the code which initializes mercury_stdin, etc.)
//
public static readonly ML_line_ending_kind ML_default_line_ending =
ML_line_ending_kind.ML_OS_line_ending;
// Assume UTF-8 encoding on files. When writing a file, don't emit
// a byte order mark.
public static readonly System.Text.Encoding text_encoding =
new System.Text.UTF8Encoding(false);
public class MR_MercuryFileStruct {
public System.IO.Stream stream; // The stream itself.
// The reader and/or writer for the stream.
// At the moment, we allow a stream only to be read OR written, not both,
// so exactly one of the following two fields will used (and be non-null)
// for any particular stream.
// Note also that we use the TextReader class interface to read both
// text AND binary files, and likewise the TextWriter class interface
// to write both text and binary files, which to me (zs) looks strange,
// given that C# also has a System.IO.BinaryReader class.
// XXX The bit about using TextReaders and TextWriters to read and write
// binary streams is not true. We actually wrap a BufferedStream (which is
// what the stream field here is) around the underlying IO.Stream and use
// that for binary file operations.
//
// XXX Using four subclasses, for text input, binary input,
// text output and binary output, as the Java code above does,
// would allow each Mercury file struct to include only the fields
// relevant to it. I (zs) don't know whether the downcasts necessary
// to use that design would have an acceptable cost or not.
// XXX Note that we *could* avoid those downcasts by making the types
// {,binary_}{input,out}_stream each be a wrapper around a *different*
// type, instead of all four being a wrapper around the same stream type.
// At that point, the notag wrapping would have no use left, except to
// make the output of e.g. ""io.write(io.stdout_stream, X, !IO)"" more
// readable when X, the value being written, is itself a stream.
public System.IO.TextReader reader;
public System.IO.TextWriter writer;
// The next character or byte to read,
// or -1 if no putback char/byte is stored.
// This field is used only for input streams, both text and binary;
// it is not used for output streams.
public int putback;
// DOS, Unix, or raw binary.
// This field is used only for text streams, both input and output;
// it is not used for binary streams.
public ML_line_ending_kind line_ending;
// This field is used only for text streams, both input and output;
// it is not used for binary streams.
public int line_number;
public int id;
};
static MR_MercuryFileStruct
mercury_file_init(System.IO.Stream stream,
System.IO.TextReader reader, System.IO.TextWriter writer,
ML_line_ending_kind line_ending)
{
MR_MercuryFileStruct mf = new MR_MercuryFileStruct();
mf.stream = stream;
mf.reader = reader;
mf.writer = writer;
mf.putback = -1;
mf.line_ending = line_ending;
mf.line_number = 1;
mf.id = ML_next_stream_id++;
return mf;
}
public static MR_MercuryFileStruct
mercury_open(string filename, string openmode, ML_line_ending_kind line_ending)
{
System.IO.FileMode mode;
System.IO.FileAccess access;
System.IO.FileShare share;
System.IO.Stream stream = null;
System.IO.TextReader reader;
System.IO.TextWriter writer;
// For Unix compatibility, we allow files to be read or written
// by multiple processes simultaneously. XXX Is this a good idea?
share = System.IO.FileShare.ReadWrite;
if (openmode == ""r"" || openmode == ""rb"") {
// Like '<' in Bourne shell.
// Read a file. The file must exist already.
mode = System.IO.FileMode.Open;
access = System.IO.FileAccess.Read;
stream = System.IO.File.Open(filename, mode, access, share);
reader = new System.IO.StreamReader(stream,
mercury.io__stream_ops.text_encoding);
writer = null;
} else if (openmode == ""w"" || openmode == ""wb"") {
// Like '>' in Bourne shell.
// Overwrite an existing file, or create a new file.
mode = System.IO.FileMode.Create;
access = System.IO.FileAccess.Write;
stream = System.IO.File.Open(filename, mode, access, share);
reader = null;
writer = new System.IO.StreamWriter(stream,
mercury.io__stream_ops.text_encoding);
} else if (openmode == ""a"" || openmode == ""ab"") {
// Like '>>' in Bourne shell.
// Append to an existing file, or create a new file.
mode = System.IO.FileMode.Append;
access = System.IO.FileAccess.Write;
stream = System.IO.File.Open(filename, mode, access, share);
reader = null;
writer = new System.IO.StreamWriter(stream,
mercury.io__stream_ops.text_encoding);
} else {
runtime.Errors.SORRY(System.String.Concat(
""foreign code for this function, open mode:"",
openmode));
// Needed to convince the C# compiler that mode and
// access are always initialized.
throw new System.Exception();
}
return mercury_file_init(new System.IO.BufferedStream(stream),
reader, writer, line_ending);
}
public static void
mercury_close(MR_MercuryFileStruct mf)
{
if (mf.reader != null) {
mf.reader.Close();
mf.reader = null;
}
if (mf.writer != null) {
// XXX The call to Flush() here is a workaround for the fact that call
// to mf.writer.Close() will dispose of the underlying IO stream and
// this will cause the call to mf.stream.Close() below to throw an
// an exception *unless* the buffer is empty.
mf.stream.Flush();
mf.writer.Close();
mf.writer = null;
}
mf.stream.Close();
mf.stream = null;
}
// Note: for Windows GUI programs, the Console is set to the equivalent
// of /dev/null. This could perhaps be considered a problem. But if so,
// it is a problem in Windows, not in Mercury -- I don't think it is one
// that the Mercury implementation should try to solve.
public static MR_MercuryFileStruct mercury_stdin =
mercury_file_init(System.Console.OpenStandardInput(),
System.Console.In, null, ML_default_line_ending);
public static MR_MercuryFileStruct mercury_stdout =
mercury_file_init(System.Console.OpenStandardOutput(),
null, System.Console.Out, ML_default_line_ending);
public static MR_MercuryFileStruct mercury_stderr =
mercury_file_init(System.Console.OpenStandardError(),
null, System.Console.Error, ML_default_line_ending);
// XXX should we use BufferedStreams here?
public static MR_MercuryFileStruct mercury_stdin_binary =
mercury_file_init(System.Console.OpenStandardInput(),
System.Console.In, null, ML_line_ending_kind.ML_raw_binary);
public static MR_MercuryFileStruct mercury_stdout_binary =
mercury_file_init(System.Console.OpenStandardOutput(),
null, System.Console.Out, ML_line_ending_kind.ML_raw_binary);
// Note: these are set again in io.init_state.
public static MR_MercuryFileStruct mercury_current_text_input =
mercury_stdin;
public static MR_MercuryFileStruct mercury_current_text_output =
mercury_stdout;
public static MR_MercuryFileStruct mercury_current_binary_input =
mercury_stdin_binary;
public static MR_MercuryFileStruct mercury_current_binary_output =
mercury_stdout_binary;
").
%---------------------------------------------------------------------------%
:- end_module io.stream_ops.
%---------------------------------------------------------------------------%
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