/*
 * Copyright (C) 2010-2011, Parrot Foundation.
** io.ops
*/

=head1 NAME

io.ops - Extended I/O Dynops

=head1 DESCRIPTION

A richer I/O API than that available in core Parrot.

=over 4

=cut

BEGIN_OPS_PREAMBLE
#include "../io/io_private.h"
END_OPS_PREAMBLE

##########################################

=item B<stat>(out INT, in STR, in INT)

=item B<stat>(out INT, in INT, in INT)

Stat the file. Return stat element $3 for file $2 into $1. The queryable
items currently are:

 EXISTS     0
 FILESIZE   1
 ISDIR      2
 ISDEV      3
 CREATETIME 4 (Time file was created)
 ACCESSTIME 5 (Time file was last accessed)
 MODIFYTIME 6 (Time file data was changed)
 CHANGETIME 7 (Time file metadata was changed)
 BACKUPTIME 8 (Time of last backup)
 UID        9
 GID        10


=cut

op stat(out INT, in STR, in INT) {
    $1 = Parrot_file_stat_intval(interp, $2, $3);
}

##########################################

=item B<read>(out STR, in INT)

Read up to N bytes from standard input stream

=item B<read>(out STR, invar PMC, in INT)

Read up to N bytes from IO PMC stream.

=cut

op read(out STR, in INT) :base_io {
    $1 = Parrot_io_reads(interp, _PIO_STDIN(interp), (size_t)$2);
}

op read(out STR, invar PMC, in INT) :base_io {
    $1 = Parrot_io_reads(interp, $2, (size_t)$3);
}

=item B<readline>(out STR, invar PMC)

Read a line up to EOL from filehandle $2.
This switches the filehandle to linebuffer-mode.

=cut

inline op readline(out STR, invar PMC) :base_io {
    $1 = Parrot_io_readline(interp, $2);
}

##########################################

=item B<printerr>(in INT)

=item B<printerr>(in NUM)

=item B<printerr>(in STR)

=item B<printerr>(invar PMC)

Print $1 to standard error.

=cut

op printerr(in INT) :base_io {
    Parrot_io_eprintf(interp, INTVAL_FMT, $1);
}

op printerr(in NUM) :base_io {
    Parrot_io_eprintf(interp, FLOATVAL_FMT, $1);
}

op printerr(in STR) :base_io {
    STRING * const s = $1;
    if (s && Parrot_str_byte_length(interp, s))
        Parrot_io_putps(interp, _PIO_STDERR(interp), s);
}

op printerr(invar PMC) :base_io {
    PMC * const p = $1;
    STRING * const s = (VTABLE_get_string(interp, p));
    if (s)
        Parrot_io_putps(interp, _PIO_STDERR(interp), s);
}

##########################################

=item B<seek>(invar PMC, in INT, in INT)

seek:
Set file position to offset $2 on IO stream $1. 'whence' is
indicated by the value in $3. The valid values for 'whence' are:

 Value      Meaning
 0          Seek from the beginning of the file
 1          Seek from the current position
 2          Seek from the end of the file

[ Note: the above values for 'whence' is just an educated guess
at this point ]

=item B<seek>(invar PMC, in INT, in INT, in INT)

64bit seek:
Set file position to offset ($2 << 32 | $3) on IO stream $1. 'whence' is
indicated by the value in $4. This allows 64-bit seeks with only 32-bit
INTVALS.

=cut

op seek(invar PMC, in INT, in INT) :base_io {
    if ($1) {
        if (Parrot_io_seek_handle(interp, $1, Parrot_io_make_offset($2), $3) < 0) {
            opcode_t * const handler = Parrot_ex_throw_from_op_args(interp, expr NEXT(),
                EXCEPTION_PIO_ERROR,
                "seek failed (32bit)");
            goto ADDRESS(handler);
        }
    }
}

op seek(invar PMC, in INT, in INT, in INT) :base_io {
    if ($1) {
        if (Parrot_io_seek_handle(interp, $1, Parrot_io_make_offset32($2, $3), $4) < 0) {
            opcode_t * const handler = Parrot_ex_throw_from_op_args(interp, expr NEXT(),
                EXCEPTION_PIO_ERROR,
                "seek failed (64bit)");
            goto ADDRESS(handler);
        }
    }
}

=item B<tell>(out INT, invar PMC)

tell:
Get the current file position of stream $2 and store it in $1.
On systems where INTVAL is 32bit the result will be truncated if the
position is beyond 2 GiB

=item B<tell>(out INT, out INT, invar PMC)

64bit tell:
Get the current file position of stream $3 in two parts of 32-bit each
($1 = pos >> 32, $2 = pos & 0xffffffff).

=cut

op tell(out INT, invar PMC) :base_io {
    if ($2)
        $1 = (INTVAL)Parrot_io_tell_handle(interp, $2);
}

op tell(out INT, out INT, invar PMC) :base_io {
    if ($3) {
        const PIOOFF_T pos = Parrot_io_tell_handle(interp, $3);
        $1 = (INTVAL)(pos >> 31);
        $2 = (INTVAL)(pos & 0xffffffff);
    }
}

##########################################

=item B<peek>(out STR)

Returns the next byte from standard input, but does not
remove it from the stream.

=item B<peek>(out STR, invar PMC)

Reads the next byte from an IO PMC, but does not
remove it from the stream.

=cut

op peek(out STR) :base_io {
    STRING ** const s = &$1;

    *s = Parrot_io_peek(interp, _PIO_STDIN(interp));
}

op peek(out STR, invar PMC) :base_io {
    STRING ** const s = &$1;

    *s = Parrot_io_peek(interp, $2);
}

#########################################

=item B<open>(out PMC, in STR, in STR)

Open URL (file, address, database, in core image) named $2 with
a mode string in $3 and create an IO object in $1.

The mode consists of a string of characters specified in any order:

 r : read
 w : write
 a : append (Note: you must specify "wa", not just "a")
 p : pipe

=item B<open>(out PMC, in STR)

Open URL (file, address, database, in core image) named $2 with
read mode and create an IO object in $1.

=cut

inline op open(out PMC, in STR, in STR) :filesys_open {
    if (STRING_IS_NULL($2) || STRING_IS_NULL($3)) {
        opcode_t * const handler = Parrot_ex_throw_from_op_args(interp, expr NEXT(),
            EXCEPTION_UNEXPECTED_NULL, "Invalid open");
        goto ADDRESS(handler);
    }
    else {
        $1 = Parrot_io_open_handle(interp, PMCNULL, $2, $3);
        PARROT_ASSERT(! PMC_IS_NULL($1));
    }
}

inline op open(out PMC, in STR) :filesys_open {
    if (STRING_IS_NULL($2)) {
        opcode_t * const handler = Parrot_ex_throw_from_op_args(interp, expr NEXT(),
            EXCEPTION_UNEXPECTED_NULL, "Invalid open");
        goto ADDRESS(handler);
    }
    else {
        $1 = Parrot_io_open_handle(interp, PMCNULL, $2, STRINGNULL);
        PARROT_ASSERT(! PMC_IS_NULL($1));
    }
}

########################################

=item B<close>(invar PMC)

Close IO object $1

=cut

inline op close(invar PMC) :base_io {
    Parrot_io_close_handle(interp, $1);
}

########################################

=item B<fdopen>(out PMC, in INT, in STR)

Create ParrotIO object in $1 as a copy of file descriptor $2.

=cut

inline op fdopen(out PMC, in INT, in STR) :filesys_open {
    $1 = Parrot_io_fdopen(interp, PMCNULL, (PIOHANDLE)$2, $3);
    if (!$1)
        $1 = Parrot_pmc_new(interp, enum_class_Undef);
}

#########################################

=item B<setstdin>(invar PMC)

Sets the standard input for a bare C<read> op to go to the supplied PMC.
Call C<getstdin> first if you care about retaining the previous PMC.

=item B<setstdout>(invar PMC)

Sets the standard output for a bare C<print> op to go to the supplied PMC.
Call C<getstdout> first if you care about retaining the previous PMC.

=item B<setstderr>(invar PMC)

Sets the standard error for a bare C<printerr> op to go to the supplied PMC.
Call C<getstderr> first if you care about retaining the previous PMC.

=cut

inline op setstdin(invar PMC) :base_io {
    _PIO_STDIN(interp) = $1;
}

inline op setstdout(invar PMC) :base_io {
    _PIO_STDOUT(interp) = $1;
}

inline op setstderr(invar PMC) :base_io {
    _PIO_STDERR(interp) = $1;
}

########################################

=back

=cut

/*
 * Local variables:
 *   c-file-style: "parrot"
 * End:
 * vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
 */