437 lines
9.4 KiB
C
437 lines
9.4 KiB
C
/* input.c -- character input functions for readline. */
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/* Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <fcntl.h>
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#if defined (HAVE_SYS_FILE_H)
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# include <sys/file.h>
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#endif /* HAVE_SYS_FILE_H */
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_SELECT)
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# if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX)
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# include <sys/time.h>
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# endif
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#endif /* HAVE_SELECT */
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#if defined (HAVE_SYS_SELECT_H)
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# include <sys/select.h>
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#endif
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#if defined (FIONREAD_IN_SYS_IOCTL)
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# include <sys/ioctl.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#if !defined (errno)
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extern int errno;
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#endif /* !errno */
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "rlprivate.h"
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#include "rlshell.h"
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#include "xmalloc.h"
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/* What kind of non-blocking I/O do we have? */
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#if !defined (O_NDELAY) && defined (O_NONBLOCK)
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# define O_NDELAY O_NONBLOCK /* Posix style */
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#endif
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/* Non-null means it is a pointer to a function to run while waiting for
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character input. */
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rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL;
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rl_getc_func_t *rl_getc_function = rl_getc;
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static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */
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/* **************************************************************** */
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/* */
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/* Character Input Buffering */
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/* */
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/* **************************************************************** */
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static int pop_index, push_index;
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static unsigned char ibuffer[512];
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static int ibuffer_len = sizeof (ibuffer) - 1;
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#define any_typein (push_index != pop_index)
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int
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_rl_any_typein ()
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{
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return any_typein;
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}
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/* Return the amount of space available in the buffer for stuffing
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characters. */
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static int
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ibuffer_space ()
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{
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if (pop_index > push_index)
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return (pop_index - push_index - 1);
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else
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return (ibuffer_len - (push_index - pop_index));
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}
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/* Get a key from the buffer of characters to be read.
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Return the key in KEY.
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Result is KEY if there was a key, or 0 if there wasn't. */
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static int
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rl_get_char (key)
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int *key;
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{
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if (push_index == pop_index)
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return (0);
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*key = ibuffer[pop_index++];
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if (pop_index >= ibuffer_len)
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pop_index = 0;
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return (1);
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}
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/* Stuff KEY into the *front* of the input buffer.
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Returns non-zero if successful, zero if there is
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no space left in the buffer. */
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static int
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rl_unget_char (key)
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int key;
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{
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if (ibuffer_space ())
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{
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pop_index--;
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if (pop_index < 0)
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pop_index = ibuffer_len - 1;
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ibuffer[pop_index] = key;
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return (1);
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}
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return (0);
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}
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/* If a character is available to be read, then read it
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and stuff it into IBUFFER. Otherwise, just return. */
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static void
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rl_gather_tyi ()
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{
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int tty;
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register int tem, result;
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int chars_avail;
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char input;
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#if defined(HAVE_SELECT)
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fd_set readfds, exceptfds;
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struct timeval timeout;
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#endif
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tty = fileno (rl_instream);
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#if defined (HAVE_SELECT)
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FD_ZERO (&readfds);
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FD_ZERO (&exceptfds);
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FD_SET (tty, &readfds);
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FD_SET (tty, &exceptfds);
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timeout.tv_sec = 0;
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timeout.tv_usec = _keyboard_input_timeout;
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if (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) <= 0)
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return; /* Nothing to read. */
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#endif
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result = -1;
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#if defined (FIONREAD)
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result = ioctl (tty, FIONREAD, &chars_avail);
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#endif
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#if defined (O_NDELAY)
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if (result == -1)
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{
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tem = fcntl (tty, F_GETFL, 0);
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fcntl (tty, F_SETFL, (tem | O_NDELAY));
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chars_avail = read (tty, &input, 1);
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fcntl (tty, F_SETFL, tem);
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if (chars_avail == -1 && errno == EAGAIN)
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return;
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}
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#endif /* O_NDELAY */
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/* If there's nothing available, don't waste time trying to read
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something. */
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if (chars_avail <= 0)
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return;
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tem = ibuffer_space ();
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if (chars_avail > tem)
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chars_avail = tem;
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/* One cannot read all of the available input. I can only read a single
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character at a time, or else programs which require input can be
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thwarted. If the buffer is larger than one character, I lose.
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Damn! */
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if (tem < ibuffer_len)
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chars_avail = 0;
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if (result != -1)
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{
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while (chars_avail--)
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rl_stuff_char ((*rl_getc_function) (rl_instream));
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}
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else
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{
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if (chars_avail)
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rl_stuff_char (input);
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}
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}
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int
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rl_set_keyboard_input_timeout (u)
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int u;
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{
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int o;
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o = _keyboard_input_timeout;
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if (u > 0)
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_keyboard_input_timeout = u;
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return (o);
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}
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/* Is there input available to be read on the readline input file
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descriptor? Only works if the system has select(2) or FIONREAD. */
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int
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_rl_input_available ()
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{
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#if defined(HAVE_SELECT)
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fd_set readfds, exceptfds;
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struct timeval timeout;
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#endif
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#if defined(FIONREAD)
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int chars_avail;
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#endif
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int tty;
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tty = fileno (rl_instream);
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#if defined (HAVE_SELECT)
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FD_ZERO (&readfds);
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FD_ZERO (&exceptfds);
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FD_SET (tty, &readfds);
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FD_SET (tty, &exceptfds);
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timeout.tv_sec = 0;
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timeout.tv_usec = _keyboard_input_timeout;
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return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
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#endif
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#if defined (FIONREAD)
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if (ioctl (tty, FIONREAD, &chars_avail) == 0)
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return (chars_avail);
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#endif
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return 0;
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}
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void
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_rl_insert_typein (c)
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int c;
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{
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int key, t, i;
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char *string;
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i = key = 0;
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string = xmalloc (ibuffer_len + 1);
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string[i++] = (char) c;
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while ((t = rl_get_char (&key)) &&
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_rl_keymap[key].type == ISFUNC &&
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_rl_keymap[key].function == rl_insert)
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string[i++] = key;
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if (t)
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rl_unget_char (key);
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string[i] = '\0';
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rl_insert_text (string);
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free (string);
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}
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/* Add KEY to the buffer of characters to be read. Returns 1 if the
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character was stuffed correctly; 0 otherwise. */
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int
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rl_stuff_char (key)
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int key;
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{
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if (ibuffer_space () == 0)
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return 0;
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if (key == EOF)
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{
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key = NEWLINE;
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rl_pending_input = EOF;
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RL_SETSTATE (RL_STATE_INPUTPENDING);
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}
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ibuffer[push_index++] = key;
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if (push_index >= ibuffer_len)
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push_index = 0;
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return 1;
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}
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/* Make C be the next command to be executed. */
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int
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rl_execute_next (c)
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int c;
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{
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rl_pending_input = c;
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RL_SETSTATE (RL_STATE_INPUTPENDING);
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return 0;
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}
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/* Clear any pending input pushed with rl_execute_next() */
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int
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rl_clear_pending_input ()
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{
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rl_pending_input = 0;
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RL_UNSETSTATE (RL_STATE_INPUTPENDING);
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return 0;
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}
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/* **************************************************************** */
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/* */
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/* Character Input */
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/* */
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/* **************************************************************** */
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/* Read a key, including pending input. */
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int
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rl_read_key ()
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{
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int c;
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rl_key_sequence_length++;
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if (rl_pending_input)
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{
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c = rl_pending_input;
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rl_clear_pending_input ();
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}
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else
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{
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/* If input is coming from a macro, then use that. */
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if (c = _rl_next_macro_key ())
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return (c);
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/* If the user has an event function, then call it periodically. */
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if (rl_event_hook)
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{
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while (rl_event_hook && rl_get_char (&c) == 0)
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{
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(*rl_event_hook) ();
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if (rl_done) /* XXX - experimental */
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return ('\n');
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rl_gather_tyi ();
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}
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}
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else
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{
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if (rl_get_char (&c) == 0)
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c = (*rl_getc_function) (rl_instream);
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}
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}
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return (c);
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}
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int
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rl_getc (stream)
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FILE *stream;
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{
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int result;
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unsigned char c;
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while (1)
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{
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result = read (fileno (stream), &c, sizeof (unsigned char));
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if (result == sizeof (unsigned char))
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return (c);
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/* If zero characters are returned, then the file that we are
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reading from is empty! Return EOF in that case. */
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if (result == 0)
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return (EOF);
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#if defined (__BEOS__)
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if (errno == EINTR)
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continue;
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#endif
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#if defined (EWOULDBLOCK)
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# define X_EWOULDBLOCK EWOULDBLOCK
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#else
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# define X_EWOULDBLOCK -99
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#endif
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#if defined (EAGAIN)
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# define X_EAGAIN EAGAIN
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#else
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# define X_EAGAIN -99
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#endif
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if (errno == X_EWOULDBLOCK || errno == X_EAGAIN)
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{
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if (sh_unset_nodelay_mode (fileno (stream)) < 0)
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return (EOF);
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continue;
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}
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#undef X_EWOULDBLOCK
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#undef X_EAGAIN
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/* If the error that we received was SIGINT, then try again,
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this is simply an interrupted system call to read ().
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Otherwise, some error ocurred, also signifying EOF. */
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if (errno != EINTR)
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return (EOF);
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}
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}
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