--- /dev/null
+/* input.c -- character input functions for readline. */
+
+/* Copyright (C) 1994-2017 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
+
+ Readline is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Readline is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define READLINE_LIBRARY
+
+#if defined (__TANDEM)
+# include <floss.h>
+#endif
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <fcntl.h>
+#if defined (HAVE_SYS_FILE_H)
+# include <sys/file.h>
+#endif /* HAVE_SYS_FILE_H */
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#if defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#else
+# include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+
+#include <signal.h>
+
+#include "posixselect.h"
+
+#if defined (FIONREAD_IN_SYS_IOCTL)
+# include <sys/ioctl.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+
+#if !defined (errno)
+extern int errno;
+#endif /* !errno */
+
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+#include "rlmbutil.h"
+
+/* Some standard library routines. */
+#include "readline.h"
+
+#include "rlprivate.h"
+#include "rlshell.h"
+#include "xmalloc.h"
+
+/* What kind of non-blocking I/O do we have? */
+#if !defined (O_NDELAY) && defined (O_NONBLOCK)
+# define O_NDELAY O_NONBLOCK /* Posix style */
+#endif
+
+#if defined (HAVE_PSELECT)
+extern sigset_t _rl_orig_sigset;
+#endif
+
+/* Non-null means it is a pointer to a function to run while waiting for
+ character input. */
+rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL;
+
+/* A function to call if a read(2) is interrupted by a signal. */
+rl_hook_func_t *rl_signal_event_hook = (rl_hook_func_t *)NULL;
+
+/* A function to replace _rl_input_available for applications using the
+ callback interface. */
+rl_hook_func_t *rl_input_available_hook = (rl_hook_func_t *)NULL;
+
+rl_getc_func_t *rl_getc_function = rl_getc;
+
+static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */
+
+static int ibuffer_space PARAMS((void));
+static int rl_get_char PARAMS((int *));
+static int rl_gather_tyi PARAMS((void));
+
+#if defined (_WIN32) && !defined (__CYGWIN__)
+
+/* 'isatty' in the Windows runtime returns non-zero for every
+ character device, including the null device. Repair that. */
+#include <io.h>
+#include <conio.h>
+#define WIN32_LEAN_AND_MEAN 1
+#include <windows.h>
+
+int w32_isatty (int fd)
+{
+ if (_isatty(fd))
+ {
+ HANDLE h;
+ DWORD ignored;
+
+ if ((h = (HANDLE) _get_osfhandle (fd)) == INVALID_HANDLE_VALUE)
+ {
+ errno = EBADF;
+ return 0;
+ }
+ if (GetConsoleMode (h, &ignored) != 0)
+ return 1;
+ }
+ errno = ENOTTY;
+ return 0;
+}
+
+#define isatty(x) w32_isatty(x)
+#endif
+
+/* **************************************************************** */
+/* */
+/* Character Input Buffering */
+/* */
+/* **************************************************************** */
+
+static int pop_index, push_index;
+static unsigned char ibuffer[512];
+static int ibuffer_len = sizeof (ibuffer) - 1;
+
+#define any_typein (push_index != pop_index)
+
+int
+_rl_any_typein (void)
+{
+ return any_typein;
+}
+
+int
+_rl_pushed_input_available (void)
+{
+ return (push_index != pop_index);
+}
+
+/* Return the amount of space available in the buffer for stuffing
+ characters. */
+static int
+ibuffer_space (void)
+{
+ if (pop_index > push_index)
+ return (pop_index - push_index - 1);
+ else
+ return (ibuffer_len - (push_index - pop_index));
+}
+
+/* Get a key from the buffer of characters to be read.
+ Return the key in KEY.
+ Result is non-zero if there was a key, or 0 if there wasn't. */
+static int
+rl_get_char (int *key)
+{
+ if (push_index == pop_index)
+ return (0);
+
+ *key = ibuffer[pop_index++];
+#if 0
+ if (pop_index >= ibuffer_len)
+#else
+ if (pop_index > ibuffer_len)
+#endif
+ pop_index = 0;
+
+ return (1);
+}
+
+/* Stuff KEY into the *front* of the input buffer.
+ Returns non-zero if successful, zero if there is
+ no space left in the buffer. */
+int
+_rl_unget_char (int key)
+{
+ if (ibuffer_space ())
+ {
+ pop_index--;
+ if (pop_index < 0)
+ pop_index = ibuffer_len;
+ ibuffer[pop_index] = key;
+ return (1);
+ }
+ return (0);
+}
+
+/* If a character is available to be read, then read it and stuff it into
+ IBUFFER. Otherwise, just return. Returns number of characters read
+ (0 if none available) and -1 on error (EIO). */
+static int
+rl_gather_tyi (void)
+{
+ int tty;
+ register int tem, result;
+ int chars_avail, k;
+ char input;
+#if defined(HAVE_SELECT)
+ fd_set readfds, exceptfds;
+ struct timeval timeout;
+#endif
+
+ chars_avail = 0;
+ input = 0;
+ tty = fileno (rl_instream);
+
+#if defined (HAVE_SELECT)
+ FD_ZERO (&readfds);
+ FD_ZERO (&exceptfds);
+ FD_SET (tty, &readfds);
+ FD_SET (tty, &exceptfds);
+ USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
+ result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout);
+ if (result <= 0)
+ return 0; /* Nothing to read. */
+#endif
+
+ result = -1;
+ errno = 0;
+#if defined (FIONREAD)
+ result = ioctl (tty, FIONREAD, &chars_avail);
+ if (result == -1 && errno == EIO)
+ return -1;
+ if (result == -1)
+ chars_avail = 0;
+#endif
+
+#if defined (O_NDELAY)
+ if (result == -1)
+ {
+ tem = fcntl (tty, F_GETFL, 0);
+
+ fcntl (tty, F_SETFL, (tem | O_NDELAY));
+ chars_avail = read (tty, &input, 1);
+
+ fcntl (tty, F_SETFL, tem);
+ if (chars_avail == -1 && errno == EAGAIN)
+ return 0;
+ if (chars_avail == -1 && errno == EIO)
+ return -1;
+ if (chars_avail == 0) /* EOF */
+ {
+ rl_stuff_char (EOF);
+ return (0);
+ }
+ }
+#endif /* O_NDELAY */
+
+#if defined (__MINGW32__)
+ /* Use getch/_kbhit to check for available console input, in the same way
+ that we read it normally. */
+ chars_avail = isatty (tty) ? _kbhit () : 0;
+ result = 0;
+#endif
+
+ /* If there's nothing available, don't waste time trying to read
+ something. */
+ if (chars_avail <= 0)
+ return 0;
+
+ tem = ibuffer_space ();
+
+ if (chars_avail > tem)
+ chars_avail = tem;
+
+ /* One cannot read all of the available input. I can only read a single
+ character at a time, or else programs which require input can be
+ thwarted. If the buffer is larger than one character, I lose.
+ Damn! */
+ if (tem < ibuffer_len)
+ chars_avail = 0;
+
+ if (result != -1)
+ {
+ while (chars_avail--)
+ {
+ RL_CHECK_SIGNALS ();
+ k = (*rl_getc_function) (rl_instream);
+ if (rl_stuff_char (k) == 0)
+ break; /* some problem; no more room */
+ if (k == NEWLINE || k == RETURN)
+ break;
+ }
+ }
+ else
+ {
+ if (chars_avail)
+ rl_stuff_char (input);
+ }
+
+ return 1;
+}
+
+int
+rl_set_keyboard_input_timeout (int u)
+{
+ int o;
+
+ o = _keyboard_input_timeout;
+ if (u >= 0)
+ _keyboard_input_timeout = u;
+ return (o);
+}
+
+/* Is there input available to be read on the readline input file
+ descriptor? Only works if the system has select(2) or FIONREAD.
+ Uses the value of _keyboard_input_timeout as the timeout; if another
+ readline function wants to specify a timeout and not leave it up to
+ the user, it should use _rl_input_queued(timeout_value_in_microseconds)
+ instead. */
+int
+_rl_input_available (void)
+{
+#if defined(HAVE_SELECT)
+ fd_set readfds, exceptfds;
+ struct timeval timeout;
+#endif
+#if !defined (HAVE_SELECT) && defined(FIONREAD)
+ int chars_avail;
+#endif
+ int tty;
+
+ if (rl_input_available_hook)
+ return (*rl_input_available_hook) ();
+
+ tty = fileno (rl_instream);
+
+#if defined (HAVE_SELECT)
+ FD_ZERO (&readfds);
+ FD_ZERO (&exceptfds);
+ FD_SET (tty, &readfds);
+ FD_SET (tty, &exceptfds);
+ timeout.tv_sec = 0;
+ timeout.tv_usec = _keyboard_input_timeout;
+ return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
+#else
+
+#if defined (FIONREAD)
+ if (ioctl (tty, FIONREAD, &chars_avail) == 0)
+ return (chars_avail);
+#endif
+
+#endif
+
+#if defined (__MINGW32__)
+ if (isatty (tty))
+ return (_kbhit ());
+#endif
+
+ return 0;
+}
+
+int
+_rl_input_queued (int t)
+{
+ int old_timeout, r;
+
+ old_timeout = rl_set_keyboard_input_timeout (t);
+ r = _rl_input_available ();
+ rl_set_keyboard_input_timeout (old_timeout);
+ return r;
+}
+
+void
+_rl_insert_typein (int c)
+{
+ int key, t, i;
+ char *string;
+
+ i = key = 0;
+ string = (char *)xmalloc (ibuffer_len + 1);
+ string[i++] = (char) c;
+
+ while ((t = rl_get_char (&key)) &&
+ _rl_keymap[key].type == ISFUNC &&
+ _rl_keymap[key].function == rl_insert)
+ string[i++] = key;
+
+ if (t)
+ _rl_unget_char (key);
+
+ string[i] = '\0';
+ rl_insert_text (string);
+ xfree (string);
+}
+
+/* Add KEY to the buffer of characters to be read. Returns 1 if the
+ character was stuffed correctly; 0 otherwise. */
+int
+rl_stuff_char (int key)
+{
+ if (ibuffer_space () == 0)
+ return 0;
+
+ if (key == EOF)
+ {
+ key = NEWLINE;
+ rl_pending_input = EOF;
+ RL_SETSTATE (RL_STATE_INPUTPENDING);
+ }
+ ibuffer[push_index++] = key;
+#if 0
+ if (push_index >= ibuffer_len)
+#else
+ if (push_index > ibuffer_len)
+#endif
+ push_index = 0;
+
+ return 1;
+}
+
+/* Make C be the next command to be executed. */
+int
+rl_execute_next (int c)
+{
+ rl_pending_input = c;
+ RL_SETSTATE (RL_STATE_INPUTPENDING);
+ return 0;
+}
+
+/* Clear any pending input pushed with rl_execute_next() */
+int
+rl_clear_pending_input (void)
+{
+ rl_pending_input = 0;
+ RL_UNSETSTATE (RL_STATE_INPUTPENDING);
+ return 0;
+}
+
+/* **************************************************************** */
+/* */
+/* Character Input */
+/* */
+/* **************************************************************** */
+
+/* Read a key, including pending input. */
+int
+rl_read_key (void)
+{
+ int c, r;
+
+ if (rl_pending_input)
+ {
+ c = rl_pending_input; /* XXX - cast to unsigned char if > 0? */
+ rl_clear_pending_input ();
+ }
+ else
+ {
+ /* If input is coming from a macro, then use that. */
+ if (c = _rl_next_macro_key ())
+ return ((unsigned char)c);
+
+ /* If the user has an event function, then call it periodically. */
+ if (rl_event_hook)
+ {
+ while (rl_event_hook)
+ {
+ if (rl_get_char (&c) != 0)
+ break;
+
+ if ((r = rl_gather_tyi ()) < 0) /* XXX - EIO */
+ {
+ rl_done = 1;
+ return (errno == EIO ? (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF) : '\n');
+ }
+ else if (r > 0) /* read something */
+ continue;
+
+ RL_CHECK_SIGNALS ();
+ if (rl_done) /* XXX - experimental */
+ return ('\n');
+ (*rl_event_hook) ();
+ }
+ }
+ else
+ {
+ if (rl_get_char (&c) == 0)
+ c = (*rl_getc_function) (rl_instream);
+/* fprintf(stderr, "rl_read_key: calling RL_CHECK_SIGNALS: _rl_caught_signal = %d", _rl_caught_signal); */
+ RL_CHECK_SIGNALS ();
+ }
+ }
+
+ return (c);
+}
+
+int
+rl_getc (FILE *stream)
+{
+ int result;
+ unsigned char c;
+#if defined (HAVE_PSELECT)
+ sigset_t empty_set;
+ fd_set readfds;
+#endif
+
+ while (1)
+ {
+ RL_CHECK_SIGNALS ();
+
+ /* We know at this point that _rl_caught_signal == 0 */
+
+#if defined (__MINGW32__)
+ if (isatty (fileno (stream)))
+ return (_getch ()); /* "There is no error return." */
+#endif
+ result = 0;
+#if defined (HAVE_PSELECT)
+ FD_ZERO (&readfds);
+ FD_SET (fileno (stream), &readfds);
+# if defined (HANDLE_SIGNALS)
+ result = pselect (fileno (stream) + 1, &readfds, NULL, NULL, NULL, &_rl_orig_sigset);
+# else
+ sigemptyset (&empty_set);
+ sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &empty_set);
+ result = pselect (fileno (stream) + 1, &readfds, NULL, NULL, NULL, &empty_set);
+# endif /* HANDLE_SIGNALS */
+#endif
+ if (result >= 0)
+ result = read (fileno (stream), &c, sizeof (unsigned char));
+
+ if (result == sizeof (unsigned char))
+ return (c);
+
+ /* If zero characters are returned, then the file that we are
+ reading from is empty! Return EOF in that case. */
+ if (result == 0)
+ return (EOF);
+
+#if defined (__BEOS__)
+ if (errno == EINTR)
+ continue;
+#endif
+
+#if defined (EWOULDBLOCK)
+# define X_EWOULDBLOCK EWOULDBLOCK
+#else
+# define X_EWOULDBLOCK -99
+#endif
+
+#if defined (EAGAIN)
+# define X_EAGAIN EAGAIN
+#else
+# define X_EAGAIN -99
+#endif
+
+ if (errno == X_EWOULDBLOCK || errno == X_EAGAIN)
+ {
+ if (sh_unset_nodelay_mode (fileno (stream)) < 0)
+ return (EOF);
+ continue;
+ }
+
+#undef X_EWOULDBLOCK
+#undef X_EAGAIN
+
+/* fprintf(stderr, "rl_getc: result = %d errno = %d\n", result, errno); */
+
+handle_error:
+ /* If the error that we received was EINTR, then try again,
+ this is simply an interrupted system call to read (). We allow
+ the read to be interrupted if we caught SIGHUP, SIGTERM, or any
+ of the other signals readline treats specially. If the
+ application sets an event hook, call it for other signals.
+ Otherwise (not EINTR), some error occurred, also signifying EOF. */
+ if (errno != EINTR)
+ return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
+ /* fatal signals of interest */
+#if defined (SIGHUP)
+ else if (_rl_caught_signal == SIGHUP || _rl_caught_signal == SIGTERM)
+#else
+ else if (_rl_caught_signal == SIGTERM)
+#endif
+ return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
+ /* keyboard-generated signals of interest */
+#if defined (SIGQUIT)
+ else if (_rl_caught_signal == SIGINT || _rl_caught_signal == SIGQUIT)
+#else
+ else if (_rl_caught_signal == SIGINT)
+#endif
+ RL_CHECK_SIGNALS ();
+ /* non-keyboard-generated signals of interest */
+#if defined (SIGWINCH)
+ else if (_rl_caught_signal == SIGWINCH)
+ RL_CHECK_SIGNALS ();
+#endif /* SIGWINCH */
+#if defined (SIGALRM)
+ else if (_rl_caught_signal == SIGALRM
+# if defined (SIGVTALRM)
+ || _rl_caught_signal == SIGVTALRM
+# endif
+ )
+ RL_CHECK_SIGNALS ();
+#endif /* SIGALRM */
+
+ if (rl_signal_event_hook)
+ (*rl_signal_event_hook) ();
+ }
+}
+
+#if defined (HANDLE_MULTIBYTE)
+/* read multibyte char */
+int
+_rl_read_mbchar (char *mbchar, int size)
+{
+ int mb_len, c;
+ size_t mbchar_bytes_length;
+ wchar_t wc;
+ mbstate_t ps, ps_back;
+
+ memset(&ps, 0, sizeof (mbstate_t));
+ memset(&ps_back, 0, sizeof (mbstate_t));
+
+ mb_len = 0;
+ while (mb_len < size)
+ {
+ RL_SETSTATE(RL_STATE_MOREINPUT);
+ c = rl_read_key ();
+ RL_UNSETSTATE(RL_STATE_MOREINPUT);
+
+ if (c < 0)
+ break;
+
+ mbchar[mb_len++] = c;
+
+ mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps);
+ if (mbchar_bytes_length == (size_t)(-1))
+ break; /* invalid byte sequence for the current locale */
+ else if (mbchar_bytes_length == (size_t)(-2))
+ {
+ /* shorted bytes */
+ ps = ps_back;
+ continue;
+ }
+ else if (mbchar_bytes_length == 0)
+ {
+ mbchar[0] = '\0'; /* null wide character */
+ mb_len = 1;
+ break;
+ }
+ else if (mbchar_bytes_length > (size_t)(0))
+ break;
+ }
+
+ return mb_len;
+}
+
+/* Read a multibyte-character string whose first character is FIRST into
+ the buffer MB of length MLEN. Returns the last character read, which
+ may be FIRST. Used by the search functions, among others. Very similar
+ to _rl_read_mbchar. */
+int
+_rl_read_mbstring (int first, char *mb, int mlen)
+{
+ int i, c, n;
+ mbstate_t ps;
+
+ c = first;
+ memset (mb, 0, mlen);
+ for (i = 0; c >= 0 && i < mlen; i++)
+ {
+ mb[i] = (char)c;
+ memset (&ps, 0, sizeof (mbstate_t));
+ n = _rl_get_char_len (mb, &ps);
+ if (n == -2)
+ {
+ /* Read more for multibyte character */
+ RL_SETSTATE (RL_STATE_MOREINPUT);
+ c = rl_read_key ();
+ RL_UNSETSTATE (RL_STATE_MOREINPUT);
+ }
+ else
+ break;
+ }
+ return c;
+}
+#endif /* HANDLE_MULTIBYTE */
projects / deliverable / binutils-gdb.git / blobdiff