class IO
Public Class Methods
Returns an File instance opened console.
If sym is given, it will be sent to the opened console with args and the result will be returned instead of the console IO itself.
You must require ‘io/console’ to use this method.
static VALUE
console_dev(int argc, VALUE *argv, VALUE klass)
{
VALUE con = 0;
VALUE sym = 0;
rb_check_arity(argc, 0, UNLIMITED_ARGUMENTS);
if (argc) {
Check_Type(sym = argv[0], T_SYMBOL);
}
// Force the class to be File.
if (klass == rb_cIO) klass = rb_cFile;
if (rb_const_defined(klass, id_console)) {
con = rb_const_get(klass, id_console);
if (!RB_TYPE_P(con, T_FILE) || RTEST(rb_io_closed_p(con))) {
rb_const_remove(klass, id_console);
con = 0;
}
}
if (sym) {
if (sym == ID2SYM(id_close) && argc == 1) {
if (con) {
rb_io_close(con);
rb_const_remove(klass, id_console);
con = 0;
}
return Qnil;
}
}
if (!con) {
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H || defined HAVE_SGTTY_H
# define CONSOLE_DEVICE "/dev/tty"
#elif defined _WIN32
# define CONSOLE_DEVICE "con$"
# define CONSOLE_DEVICE_FOR_READING "conin$"
# define CONSOLE_DEVICE_FOR_WRITING "conout$"
#endif
#ifndef CONSOLE_DEVICE_FOR_READING
# define CONSOLE_DEVICE_FOR_READING CONSOLE_DEVICE
#endif
#ifdef CONSOLE_DEVICE_FOR_WRITING
VALUE out;
rb_io_t *ofptr;
#endif
int fd;
VALUE path = rb_obj_freeze(rb_str_new2(CONSOLE_DEVICE));
#ifdef CONSOLE_DEVICE_FOR_WRITING
fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_WRITING, O_RDWR, 0);
if (fd < 0) return Qnil;
out = rb_io_open_descriptor(klass, fd, FMODE_WRITABLE | FMODE_SYNC, path, Qnil, NULL);
#endif
fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_READING, O_RDWR, 0);
if (fd < 0) {
#ifdef CONSOLE_DEVICE_FOR_WRITING
rb_io_close(out);
#endif
return Qnil;
}
con = rb_io_open_descriptor(klass, fd, FMODE_READWRITE | FMODE_SYNC, path, Qnil, NULL);
#ifdef CONSOLE_DEVICE_FOR_WRITING
rb_io_set_write_io(con, out);
#endif
rb_const_set(klass, id_console, con);
}
if (sym) {
return rb_f_send(argc, argv, con);
}
return con;
}
fallback to console window size
# File io/console/lib/console/size.rb, line 3 def IO.default_console_size [ ENV["LINES"].to_i.nonzero? || 25, ENV["COLUMNS"].to_i.nonzero? || 80, ] end
Public Instance Methods
static VALUE
console_beep(VALUE io)
{
#ifdef _WIN32
MessageBeep(0);
#else
int fd = GetWriteFD(io);
if (write(fd, "\a", 1) < 0) sys_fail(io);
#endif
return io;
}
static VALUE
console_check_winsize_changed(VALUE io)
{
HANDLE h;
DWORD num;
h = (HANDLE)rb_w32_get_osfhandle(GetReadFD(io));
while (GetNumberOfConsoleInputEvents(h, &num) && num > 0) {
INPUT_RECORD rec;
if (ReadConsoleInput(h, &rec, 1, &num)) {
if (rec.EventType == WINDOW_BUFFER_SIZE_EVENT) {
rb_yield(Qnil);
}
}
}
return io;
}
static VALUE
console_clear_screen(VALUE io)
{
console_erase_screen(io, INT2FIX(2));
console_goto(io, INT2FIX(0), INT2FIX(0));
return io;
}
Returns a data represents the current console mode.
You must require ‘io/console’ to use this method.
static VALUE
console_conmode_get(VALUE io)
{
conmode t;
int fd = GetReadFD(io);
if (!getattr(fd, &t)) sys_fail(io);
return conmode_new(cConmode, &t);
}
Sets the console mode to mode.
You must require ‘io/console’ to use this method.
static VALUE
console_conmode_set(VALUE io, VALUE mode)
{
conmode *t, r;
int fd = GetReadFD(io);
TypedData_Get_Struct(mode, conmode, &conmode_type, t);
r = *t;
if (!setattr(fd, &r)) sys_fail(io);
return mode;
}
Yields self within cooked mode.
STDIN.cooked(&:gets)
will read and return a line with echo back and line editing.
You must require ‘io/console’ to use this method.
static VALUE
console_cooked(VALUE io)
{
return ttymode(io, rb_yield, io, set_cookedmode, NULL);
}
Enables cooked mode.
If the terminal mode needs to be back, use io.cooked { … }.
You must require ‘io/console’ to use this method.
static VALUE
console_set_cooked(VALUE io)
{
conmode t;
int fd = GetReadFD(io);
if (!getattr(fd, &t)) sys_fail(io);
set_cookedmode(&t, NULL);
if (!setattr(fd, &t)) sys_fail(io);
return io;
}
static VALUE
console_cursor_pos(VALUE io)
{
rb_console_size_t ws;
int fd = GetWriteFD(io);
if (!GetConsoleScreenBufferInfo((HANDLE)rb_w32_get_osfhandle(fd), &ws)) {
rb_syserr_fail(LAST_ERROR, 0);
}
return rb_assoc_new(UINT2NUM(ws.dwCursorPosition.Y), UINT2NUM(ws.dwCursorPosition.X));
}
static VALUE
console_cursor_set(VALUE io, VALUE cpos)
{
cpos = rb_convert_type(cpos, T_ARRAY, "Array", "to_ary");
if (RARRAY_LEN(cpos) != 2) rb_raise(rb_eArgError, "expected 2D coordinate");
return console_goto(io, RARRAY_AREF(cpos, 0), RARRAY_AREF(cpos, 1));
}
static VALUE
console_cursor_down(VALUE io, VALUE val)
{
return console_move(io, +NUM2INT(val), 0);
}
static VALUE
console_cursor_left(VALUE io, VALUE val)
{
return console_move(io, 0, -NUM2INT(val));
}
static VALUE
console_cursor_right(VALUE io, VALUE val)
{
return console_move(io, 0, +NUM2INT(val));
}
static VALUE
console_cursor_up(VALUE io, VALUE val)
{
return console_move(io, -NUM2INT(val), 0);
}
Enables/disables echo back. On some platforms, all combinations of this flags and raw/cooked mode may not be valid.
You must require ‘io/console’ to use this method.
static VALUE
console_set_echo(VALUE io, VALUE f)
{
conmode t;
int fd = GetReadFD(io);
if (!getattr(fd, &t)) sys_fail(io);
if (RTEST(f))
set_echo(&t, NULL);
else
set_noecho(&t, NULL);
if (!setattr(fd, &t)) sys_fail(io);
return io;
}
Returns true if echo back is enabled.
You must require ‘io/console’ to use this method.
static VALUE
console_echo_p(VALUE io)
{
conmode t;
int fd = GetReadFD(io);
if (!getattr(fd, &t)) sys_fail(io);
return echo_p(&t) ? Qtrue : Qfalse;
}
static VALUE
console_erase_line(VALUE io, VALUE val)
{
HANDLE h;
rb_console_size_t ws;
COORD *pos = &ws.dwCursorPosition;
DWORD w;
int mode = mode_in_range(val, 2, "line erase");
h = (HANDLE)rb_w32_get_osfhandle(GetWriteFD(io));
if (!GetConsoleScreenBufferInfo(h, &ws)) {
rb_syserr_fail(LAST_ERROR, 0);
}
w = winsize_col(&ws);
switch (mode) {
case 0: /* after cursor */
w -= pos->X;
break;
case 1: /* before *and* cursor */
w = pos->X + 1;
pos->X = 0;
break;
case 2: /* entire line */
pos->X = 0;
break;
}
constat_clear(h, ws.wAttributes, w, *pos);
return io;
}
static VALUE
console_erase_screen(VALUE io, VALUE val)
{
HANDLE h;
rb_console_size_t ws;
COORD *pos = &ws.dwCursorPosition;
DWORD w;
int mode = mode_in_range(val, 3, "screen erase");
h = (HANDLE)rb_w32_get_osfhandle(GetWriteFD(io));
if (!GetConsoleScreenBufferInfo(h, &ws)) {
rb_syserr_fail(LAST_ERROR, 0);
}
w = winsize_col(&ws);
switch (mode) {
case 0: /* erase after cursor */
w = (w * (ws.srWindow.Bottom - pos->Y + 1) - pos->X);
break;
case 1: /* erase before *and* cursor */
w = (w * (pos->Y - ws.srWindow.Top) + pos->X + 1);
pos->X = 0;
pos->Y = ws.srWindow.Top;
break;
case 2: /* erase entire screen */
w = (w * winsize_row(&ws));
pos->X = 0;
pos->Y = ws.srWindow.Top;
break;
case 3: /* erase entire screen */
w = (w * ws.dwSize.Y);
pos->X = 0;
pos->Y = 0;
break;
}
constat_clear(h, ws.wAttributes, w, *pos);
return io;
}
Reads and returns a character in raw mode.
See IO#raw for details on the parameters.
You must require ‘io/console’ to use this method.
static VALUE
console_getch(int argc, VALUE *argv, VALUE io)
{
rawmode_arg_t opts, *optp = rawmode_opt(&argc, argv, 0, 0, &opts);
#ifndef _WIN32
return ttymode(io, getc_call, io, set_rawmode, optp);
#else
rb_io_t *fptr;
VALUE str;
wint_t c;
int len;
char buf[8];
wint_t wbuf[2];
# ifndef HAVE_RB_IO_WAIT
struct timeval *to = NULL, tv;
# else
VALUE timeout = Qnil;
# endif
GetOpenFile(io, fptr);
if (optp) {
if (optp->vtime) {
# ifndef HAVE_RB_IO_WAIT
to = &tv;
# else
struct timeval tv;
# endif
tv.tv_sec = optp->vtime / 10;
tv.tv_usec = (optp->vtime % 10) * 100000;
# ifdef HAVE_RB_IO_WAIT
timeout = rb_fiber_scheduler_make_timeout(&tv);
# endif
}
switch (optp->vmin) {
case 1: /* default */
break;
case 0: /* return nil when timed out */
if (optp->vtime) break;
/* fallthru */
default:
rb_warning("min option larger than 1 ignored");
}
if (optp->intr) {
# ifndef HAVE_RB_IO_WAIT
int w = rb_wait_for_single_fd(fptr->fd, RB_WAITFD_IN, to);
if (w < 0) rb_eof_error();
if (!(w & RB_WAITFD_IN)) return Qnil;
# else
VALUE result = rb_io_wait(io, RB_INT2NUM(RUBY_IO_READABLE), timeout);
if (!RTEST(result)) return Qnil;
# endif
}
else if (optp->vtime) {
rb_warning("Non-zero vtime option ignored if intr flag is unset");
}
}
len = (int)(VALUE)rb_thread_call_without_gvl(nogvl_getch, wbuf, RUBY_UBF_IO, 0);
switch (len) {
case 0:
return Qnil;
case 2:
buf[0] = (char)wbuf[0];
c = wbuf[1];
len = 1;
do {
buf[len++] = (unsigned char)c;
} while ((c >>= CHAR_BIT) && len < (int)sizeof(buf));
return rb_str_new(buf, len);
default:
c = wbuf[0];
len = rb_uv_to_utf8(buf, c);
str = rb_utf8_str_new(buf, len);
return rb_str_conv_enc(str, NULL, rb_default_external_encoding());
}
#endif
}
Reads and returns a line without echo back. Prints prompt unless it is nil.
The newline character that terminates the read line is removed from the returned string, see String#chomp!.
You must require ‘io/console’ to use this method.
require 'io/console' IO::console.getpass("Enter password:") Enter password: # => "mypassword"
static VALUE
console_getpass(int argc, VALUE *argv, VALUE io)
{
VALUE str, wio;
rb_check_arity(argc, 0, 1);
wio = rb_io_get_write_io(io);
if (wio == io && io == rb_stdin) wio = rb_stderr;
prompt(argc, argv, wio);
rb_io_flush(wio);
str = rb_ensure(getpass_call, io, puts_call, wio);
return str_chomp(str);
}
static VALUE
console_goto(VALUE io, VALUE y, VALUE x)
{
COORD pos;
int fd = GetWriteFD(io);
pos.X = NUM2UINT(x);
pos.Y = NUM2UINT(y);
if (!SetConsoleCursorPosition((HANDLE)rb_w32_get_osfhandle(fd), pos)) {
rb_syserr_fail(LAST_ERROR, 0);
}
return io;
}
static VALUE
console_goto_column(VALUE io, VALUE val)
{
HANDLE h;
rb_console_size_t ws;
COORD *pos = &ws.dwCursorPosition;
h = (HANDLE)rb_w32_get_osfhandle(GetWriteFD(io));
if (!GetConsoleScreenBufferInfo(h, &ws)) {
rb_syserr_fail(LAST_ERROR, 0);
}
pos->X = NUM2INT(val);
if (!SetConsoleCursorPosition(h, *pos)) {
rb_syserr_fail(LAST_ERROR, 0);
}
return io;
}
Flushes input buffer in kernel.
You must require ‘io/console’ to use this method.
static VALUE
console_iflush(VALUE io)
{
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
int fd = GetReadFD(io);
if (tcflush(fd, TCIFLUSH)) sys_fail(io);
#endif
return io;
}
Flushes input and output buffers in kernel.
You must require ‘io/console’ to use this method.
static VALUE
console_ioflush(VALUE io)
{
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
int fd1 = GetReadFD(io);
int fd2 = GetWriteFD(io);
if (fd2 != -1 && fd1 != fd2) {
if (tcflush(fd1, TCIFLUSH)) sys_fail(io);
if (tcflush(fd2, TCOFLUSH)) sys_fail(io);
}
else {
if (tcflush(fd1, TCIOFLUSH)) sys_fail(io);
}
#endif
return io;
}
Yields self with disabling echo back.
STDIN.noecho(&:gets)
will read and return a line without echo back.
You must require ‘io/console’ to use this method.
static VALUE
console_noecho(VALUE io)
{
return ttymode(io, rb_yield, io, set_noecho, NULL);
}
Yields self in non-blocking mode.
When false is given as an argument, self is yielded in blocking mode. The original mode is restored after the block is executed.
static VALUE
rb_io_nonblock_block(int argc, VALUE *argv, VALUE self)
{
int nb = 1;
int descriptor = rb_io_descriptor(self);
if (argc > 0) {
VALUE v;
rb_scan_args(argc, argv, "01", &v);
nb = RTEST(v);
}
int current_flags = get_fcntl_flags(descriptor);
int restore[2] = {descriptor, current_flags};
if (!io_nonblock_set(descriptor, current_flags, nb))
return rb_yield(self);
return rb_ensure(rb_yield, self, io_nonblock_restore, (VALUE)restore);
}
Enables non-blocking mode on a stream when set to true, and blocking mode when set to false.
This method set or clear O_NONBLOCK flag for the file descriptor in ios.
The behavior of most IO methods is not affected by this flag because they retry system calls to complete their task after EAGAIN and partial read/write. (An exception is IO#syswrite which doesn’t retry.)
This method can be used to clear non-blocking mode of standard I/O. Since nonblocking methods (read_nonblock, etc.) set non-blocking mode but they doesn’t clear it, this method is usable as follows.
END { STDOUT.nonblock = false } STDOUT.write_nonblock("foo")
Since the flag is shared across processes and many non-Ruby commands doesn’t expect standard I/O with non-blocking mode, it would be safe to clear the flag before Ruby program exits.
For example following Ruby program leaves STDIN/STDOUT/STDER non-blocking mode. (STDIN, STDOUT and STDERR are connected to a terminal. So making one of them nonblocking-mode effects other two.) Thus cat command try to read from standard input and it causes “Resource temporarily unavailable” error (EAGAIN).
% ruby -e '
STDOUT.write_nonblock("foo\n")'; cat
foo
cat: -: Resource temporarily unavailable
Clearing the flag makes the behavior of cat command normal. (cat command waits input from standard input.)
% ruby -rio/nonblock -e '
END { STDOUT.nonblock = false }
STDOUT.write_nonblock("foo")
'; cat
foo
static VALUE
rb_io_nonblock_set(VALUE self, VALUE value)
{
if (RTEST(value)) {
rb_io_t *fptr;
GetOpenFile(self, fptr);
rb_io_set_nonblock(fptr);
}
else {
int descriptor = rb_io_descriptor(self);
io_nonblock_set(descriptor, get_fcntl_flags(descriptor), RTEST(value));
}
return self;
}
Returns true if an IO object is in non-blocking mode.
static VALUE
rb_io_nonblock_p(VALUE io)
{
if (get_fcntl_flags(rb_io_descriptor(io)) & O_NONBLOCK)
return Qtrue;
return Qfalse;
}
Returns number of bytes that can be read without blocking. Returns zero if no information available.
You must require ‘io/wait’ to use this method.
static VALUE
io_nread(VALUE io)
{
rb_io_t *fptr;
int len;
ioctl_arg n;
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
len = rb_io_read_pending(fptr);
if (len > 0) return INT2FIX(len);
#ifdef HAVE_RB_IO_DESCRIPTOR
int fd = rb_io_descriptor(io);
#else
int fd = fptr->fd;
#endif
if (!FIONREAD_POSSIBLE_P(fd)) return INT2FIX(0);
if (ioctl(fd, FIONREAD, &n)) return INT2FIX(0);
if (n > 0) return ioctl_arg2num(n);
return INT2FIX(0);
}
Flushes output buffer in kernel.
You must require ‘io/console’ to use this method.
static VALUE
console_oflush(VALUE io)
{
int fd = GetWriteFD(io);
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
if (tcflush(fd, TCOFLUSH)) sys_fail(io);
#endif
(void)fd;
return io;
}
static VALUE
console_key_pressed_p(VALUE io, VALUE k)
{
int vk = -1;
if (FIXNUM_P(k)) {
vk = NUM2UINT(k);
}
else {
const struct vktable *t;
const char *kn;
if (SYMBOL_P(k)) {
k = rb_sym2str(k);
kn = RSTRING_PTR(k);
}
else {
kn = StringValuePtr(k);
}
t = console_win32_vk(kn, RSTRING_LEN(k));
if (!t || (vk = (short)t->vk) == -1) {
rb_raise(rb_eArgError, "unknown virtual key code: % "PRIsVALUE, k);
}
}
return GetKeyState(vk) & 0x80 ? Qtrue : Qfalse;
}
Yields self within raw mode, and returns the result of the block.
STDIN.raw(&:gets)
will read and return a line without echo back and line editing.
The parameter min specifies the minimum number of bytes that should be received when a read operation is performed. (default: 1)
The parameter time specifies the timeout in seconds with a precision of 1/10 of a second. (default: 0)
If the parameter intr is true, enables break, interrupt, quit, and suspend special characters.
Refer to the manual page of termios for further details.
You must require ‘io/console’ to use this method.
static VALUE
console_raw(int argc, VALUE *argv, VALUE io)
{
rawmode_arg_t opts, *optp = rawmode_opt(&argc, argv, 0, 0, &opts);
return ttymode(io, rb_yield, io, set_rawmode, optp);
}
Enables raw mode, and returns io.
If the terminal mode needs to be back, use io.raw { ... }.
See IO#raw for details on the parameters.
You must require ‘io/console’ to use this method.
static VALUE
console_set_raw(int argc, VALUE *argv, VALUE io)
{
conmode t;
rawmode_arg_t opts, *optp = rawmode_opt(&argc, argv, 0, 0, &opts);
int fd = GetReadFD(io);
if (!getattr(fd, &t)) sys_fail(io);
set_rawmode(&t, optp);
if (!setattr(fd, &t)) sys_fail(io);
return io;
}
Returns a truthy value if input available without blocking, or a falsy value.
You must require ‘io/wait’ to use this method.
static VALUE
io_ready_p(VALUE io)
{
rb_io_t *fptr;
#ifndef HAVE_RB_IO_WAIT
struct timeval tv = {0, 0};
#endif
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
if (rb_io_read_pending(fptr)) return Qtrue;
#ifndef HAVE_RB_IO_WAIT
return wait_for_single_fd(fptr, RB_WAITFD_IN, &tv) ? Qtrue : Qfalse;
#else
return io_wait_event(io, RUBY_IO_READABLE, RB_INT2NUM(0), 1);
#endif
}
static VALUE
console_scroll_backward(VALUE io, VALUE val)
{
return console_scroll(io, -NUM2INT(val));
}
static VALUE
console_scroll_forward(VALUE io, VALUE val)
{
return console_scroll(io, +NUM2INT(val));
}
Waits until the IO becomes ready for the specified events and returns the subset of events that become ready, or a falsy value when times out.
The events can be a bit mask of IO::READABLE, IO::WRITABLE or IO::PRIORITY.
Returns a truthy value immediately when buffered data is available.
Optional parameter mode is one of :read, :write, or :read_write.
You must require ‘io/wait’ to use this method.
static VALUE
io_wait(int argc, VALUE *argv, VALUE io)
{
#ifndef HAVE_RB_IO_WAIT
rb_io_t *fptr;
struct timeval timerec;
struct timeval *tv = NULL;
int event = 0;
int i;
GetOpenFile(io, fptr);
for (i = 0; i < argc; ++i) {
if (SYMBOL_P(argv[i])) {
event |= wait_mode_sym(argv[i]);
}
else {
*(tv = &timerec) = rb_time_interval(argv[i]);
}
}
/* rb_time_interval() and might_mode() might convert the argument */
rb_io_check_closed(fptr);
if (!event) event = RB_WAITFD_IN;
if ((event & RB_WAITFD_IN) && rb_io_read_pending(fptr))
return Qtrue;
if (wait_for_single_fd(fptr, event, tv))
return io;
return Qnil;
#else
VALUE timeout = Qundef;
rb_io_event_t events = 0;
int i, return_io = 0;
/* The documented signature for this method is actually incorrect.
* A single timeout is allowed in any position, and multiple symbols can be given.
* Whether this is intentional or not, I don't know, and as such I consider this to
* be a legacy/slow path. */
if (argc != 2 || (RB_SYMBOL_P(argv[0]) || RB_SYMBOL_P(argv[1]))) {
/* We'd prefer to return the actual mask, but this form would return the io itself: */
return_io = 1;
/* Slow/messy path: */
for (i = 0; i < argc; i += 1) {
if (RB_SYMBOL_P(argv[i])) {
events |= wait_mode_sym(argv[i]);
}
else if (timeout == Qundef) {
rb_time_interval(timeout = argv[i]);
}
else {
rb_raise(rb_eArgError, "timeout given more than once");
}
}
if (timeout == Qundef) timeout = Qnil;
if (events == 0) {
events = RUBY_IO_READABLE;
}
}
else /* argc == 2 and neither are symbols */ {
/* This is the fast path: */
events = io_event_from_value(argv[0]);
timeout = argv[1];
}
if (events & RUBY_IO_READABLE) {
rb_io_t *fptr = NULL;
RB_IO_POINTER(io, fptr);
if (rb_io_read_pending(fptr)) {
/* This was the original behaviour: */
if (return_io) return Qtrue;
/* New behaviour always returns an event mask: */
else return RB_INT2NUM(RUBY_IO_READABLE);
}
}
return io_wait_event(io, events, timeout, return_io);
#endif
}
Waits until IO is priority and returns a truthy value or a falsy value when times out. Priority data is sent and received using the Socket::MSG_OOB flag and is typically limited to streams.
You must require ‘io/wait’ to use this method.
static VALUE
io_wait_priority(int argc, VALUE *argv, VALUE io)
{
rb_io_t *fptr = NULL;
RB_IO_POINTER(io, fptr);
rb_io_check_readable(fptr);
if (rb_io_read_pending(fptr)) return Qtrue;
rb_check_arity(argc, 0, 1);
VALUE timeout = argc == 1 ? argv[0] : Qnil;
return io_wait_event(io, RUBY_IO_PRIORITY, timeout, 1);
}
Waits until IO is readable and returns a truthy value, or a falsy value when times out. Returns a truthy value immediately when buffered data is available.
You must require ‘io/wait’ to use this method.
static VALUE
io_wait_readable(int argc, VALUE *argv, VALUE io)
{
rb_io_t *fptr;
#ifndef HAVE_RB_IO_WAIT
struct timeval timerec;
struct timeval *tv;
#endif
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
#ifndef HAVE_RB_IO_WAIT
tv = get_timeout(argc, argv, &timerec);
#endif
if (rb_io_read_pending(fptr)) return Qtrue;
#ifndef HAVE_RB_IO_WAIT
if (wait_for_single_fd(fptr, RB_WAITFD_IN, tv)) {
return io;
}
return Qnil;
#else
rb_check_arity(argc, 0, 1);
VALUE timeout = (argc == 1 ? argv[0] : Qnil);
return io_wait_event(io, RUBY_IO_READABLE, timeout, 1);
#endif
}
Waits until IO is writable and returns a truthy value or a falsy value when times out.
You must require ‘io/wait’ to use this method.
static VALUE
io_wait_writable(int argc, VALUE *argv, VALUE io)
{
rb_io_t *fptr;
#ifndef HAVE_RB_IO_WAIT
struct timeval timerec;
struct timeval *tv;
#endif
GetOpenFile(io, fptr);
rb_io_check_writable(fptr);
#ifndef HAVE_RB_IO_WAIT
tv = get_timeout(argc, argv, &timerec);
if (wait_for_single_fd(fptr, RB_WAITFD_OUT, tv)) {
return io;
}
return Qnil;
#else
rb_check_arity(argc, 0, 1);
VALUE timeout = (argc == 1 ? argv[0] : Qnil);
return io_wait_event(io, RUBY_IO_WRITABLE, timeout, 1);
#endif
}
Returns console size.
You must require ‘io/console’ to use this method.
static VALUE
console_winsize(VALUE io)
{
rb_console_size_t ws;
int fd = GetWriteFD(io);
if (!getwinsize(fd, &ws)) sys_fail(io);
return rb_assoc_new(INT2NUM(winsize_row(&ws)), INT2NUM(winsize_col(&ws)));
}
Tries to set console size. The effect depends on the platform and the running environment.
You must require ‘io/console’ to use this method.
static VALUE
console_set_winsize(VALUE io, VALUE size)
{
rb_console_size_t ws;
#if defined _WIN32
HANDLE wh;
int newrow, newcol;
BOOL ret;
#endif
VALUE row, col, xpixel, ypixel;
const VALUE *sz;
long sizelen;
int fd;
size = rb_Array(size);
if ((sizelen = RARRAY_LEN(size)) != 2 && sizelen != 4) {
rb_raise(rb_eArgError, "wrong number of arguments (given %ld, expected 2 or 4)", sizelen);
}
sz = RARRAY_CONST_PTR(size);
row = sz[0], col = sz[1], xpixel = ypixel = Qnil;
if (sizelen == 4) xpixel = sz[2], ypixel = sz[3];
fd = GetWriteFD(io);
#if defined TIOCSWINSZ
ws.ws_row = ws.ws_col = ws.ws_xpixel = ws.ws_ypixel = 0;
#define SET(m) ws.ws_##m = NIL_P(m) ? 0 : (unsigned short)NUM2UINT(m)
SET(row);
SET(col);
SET(xpixel);
SET(ypixel);
#undef SET
if (!setwinsize(fd, &ws)) sys_fail(io);
#elif defined _WIN32
wh = (HANDLE)rb_w32_get_osfhandle(fd);
#define SET(m) new##m = NIL_P(m) ? 0 : (unsigned short)NUM2UINT(m)
SET(row);
SET(col);
#undef SET
if (!NIL_P(xpixel)) (void)NUM2UINT(xpixel);
if (!NIL_P(ypixel)) (void)NUM2UINT(ypixel);
if (!GetConsoleScreenBufferInfo(wh, &ws)) {
rb_syserr_fail(LAST_ERROR, "GetConsoleScreenBufferInfo");
}
ws.dwSize.X = newcol;
ret = SetConsoleScreenBufferSize(wh, ws.dwSize);
ws.srWindow.Left = 0;
ws.srWindow.Top = 0;
ws.srWindow.Right = newcol-1;
ws.srWindow.Bottom = newrow-1;
if (!SetConsoleWindowInfo(wh, TRUE, &ws.srWindow)) {
rb_syserr_fail(LAST_ERROR, "SetConsoleWindowInfo");
}
/* retry when shrinking buffer after shrunk window */
if (!ret && !SetConsoleScreenBufferSize(wh, ws.dwSize)) {
rb_syserr_fail(LAST_ERROR, "SetConsoleScreenBufferInfo");
}
/* remove scrollbar if possible */
if (!SetConsoleWindowInfo(wh, TRUE, &ws.srWindow)) {
rb_syserr_fail(LAST_ERROR, "SetConsoleWindowInfo");
}
#endif
return io;
}