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io.ops
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io.ops
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/*
* 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' :
*/