input.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:12k
- /* input.c -- character input functions for readline. */
- /* Copyright (C) 1994 Free Software Foundation, Inc.
- This file is part of the GNU Readline Library, a library for
- reading lines of text with interactive input and history editing.
- The GNU Readline Library 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 2, or
- (at your option) any later version.
- The GNU Readline Library 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.
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
- #define READLINE_LIBRARY
- #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 */
- #if defined (HAVE_SELECT)
- # if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX) || defined(TIME_WITH_SYS_TIME)
- # include <sys/time.h>
- # endif
- #endif /* HAVE_SELECT */
- #if defined (HAVE_SYS_SELECT_H)
- # include <sys/select.h>
- #endif
- #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"
- /* Some standard library routines. */
- #include "readline.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
- /* Functions imported from other files in the library. */
- extern char *xmalloc (), *xrealloc ();
- /* Variables and functions from macro.c. */
- extern void _rl_add_macro_char ();
- extern void _rl_with_macro_input ();
- extern int _rl_next_macro_key ();
- extern int _rl_defining_kbd_macro;
- #if defined (VI_MODE)
- extern void _rl_vi_set_last ();
- extern int _rl_vi_textmod_command ();
- #endif /* VI_MODE */
- extern FILE *rl_instream, *rl_outstream;
- extern Function *rl_last_func;
- extern int rl_key_sequence_length;
- extern int rl_pending_input;
- extern int rl_editing_mode;
- extern Keymap _rl_keymap;
- extern int _rl_convert_meta_chars_to_ascii;
- #if defined (__GO32__)
- # include <pc.h>
- #endif /* __GO32__ */
- /* Non-null means it is a pointer to a function to run while waiting for
- character input. */
- Function *rl_event_hook = (Function *)NULL;
- Function *rl_getc_function = rl_getc;
- /* **************************************************************** */
- /* */
- /* 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 ()
- {
- return any_typein;
- }
- /* Return the amount of space available in the buffer for stuffing
- characters. */
- static int
- ibuffer_space ()
- {
- 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 KEY if there was a key, or 0 if there wasn't. */
- static int
- rl_get_char (key)
- int *key;
- {
- if (push_index == pop_index)
- return (0);
- *key = ibuffer[pop_index++];
- if (pop_index >= ibuffer_len)
- 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. */
- static int
- rl_unget_char (key)
- int key;
- {
- if (ibuffer_space ())
- {
- pop_index--;
- if (pop_index < 0)
- pop_index = ibuffer_len - 1;
- ibuffer[pop_index] = key;
- return (1);
- }
- return (0);
- }
- #if defined(__EMX__)
- int waiting_char = -1;
- #endif
- /* If a character is available to be read, then read it
- and stuff it into IBUFFER. Otherwise, just return. */
- static void
- rl_gather_tyi ()
- {
- #if defined (__EMX__)
- if (isatty (0) && (waiting_char = _read_kbd(0, 0, 0)) != -1 && ibuffer_space ())
- {
- int i;
- i = (*rl_getc_function) (rl_instream);
- rl_stuff_char (i);
- }
- #elif defined (__GO32__)
- char input;
- if (isatty (0) && kbhit () && ibuffer_space ())
- {
- int i;
- i = (*rl_getc_function) (rl_instream);
- rl_stuff_char (i);
- }
- #else /* !__GO32__ */
- int tty;
- register int tem, result;
- int chars_avail;
- char input;
- #if defined(HAVE_SELECT)
- fd_set readfds, exceptfds;
- struct timeval timeout;
- #endif
- 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 = 100000; /* 0.1 seconds */
- if (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) <= 0)
- return; /* Nothing to read. */
- #endif
- result = -1;
- #if defined (FIONREAD)
- result = ioctl (tty, FIONREAD, &chars_avail);
- #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;
- }
- #endif /* O_NDELAY */
- /* If there's nothing available, don't waste time trying to read
- something. */
- if (chars_avail <= 0)
- return;
- 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_stuff_char ((*rl_getc_function) (rl_instream));
- }
- else
- {
- if (chars_avail)
- rl_stuff_char (input);
- }
- #endif /* !__GO32__ */
- }
- /* Is there input available to be read on the readline input file
- descriptor? Only works if the system has select(2) or FIONREAD. */
- int
- _rl_input_available ()
- {
- #if defined (__EMX__)
- if (isatty (0) && (waiting_char = _read_kbd(0, 0, 0)) != -1)
- return 1;
- #else /* __EMX__ */
- #if defined(HAVE_SELECT)
- fd_set readfds, exceptfds;
- struct timeval timeout;
- #endif
- #if defined(FIONREAD)
- int chars_avail;
- #endif
- int tty;
- 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 = 100000; /* 0.1 seconds */
- return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
- #endif
- #if defined (FIONREAD)
- if (ioctl (tty, FIONREAD, &chars_avail) == 0)
- return (chars_avail);
- #endif
- #endif /* !__EMX__ */
- return 0;
- }
- void
- _rl_insert_typein (c)
- int c;
- {
- int key, t, i;
- char *string;
- i = key = 0;
- string = 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] = '';
- rl_insert_text (string);
- free (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 (key)
- int key;
- {
- if (ibuffer_space () == 0)
- return 0;
- if (key == EOF)
- {
- key = NEWLINE;
- rl_pending_input = EOF;
- }
- ibuffer[push_index++] = key;
- if (push_index >= ibuffer_len)
- push_index = 0;
- return 1;
- }
- /* Make C be the next command to be executed. */
- int
- rl_execute_next (c)
- int c;
- {
- rl_pending_input = c;
- return 0;
- }
- /* **************************************************************** */
- /* */
- /* Character Input */
- /* */
- /* **************************************************************** */
- /* Read a key, including pending input. */
- int
- rl_read_key ()
- {
- int c;
- rl_key_sequence_length++;
- if (rl_pending_input)
- {
- c = rl_pending_input;
- rl_pending_input = 0;
- }
- else
- {
- /* If input is coming from a macro, then use that. */
- if ((c = _rl_next_macro_key ()))
- return (c);
- /* If the user has an event function, then call it periodically. */
- if (rl_event_hook)
- {
- while (rl_event_hook && rl_get_char (&c) == 0)
- {
- (*rl_event_hook) ();
- rl_gather_tyi ();
- }
- }
- else
- {
- if (rl_get_char (&c) == 0)
- c = (*rl_getc_function) (rl_instream);
- }
- }
- return (c);
- }
- int
- rl_getc (stream)
- FILE *stream;
- {
- int result, flags;
- unsigned char c;
- #if defined (__EMX__)
- if (isatty (0))
- {
- int key;
- if (waiting_char != -1)
- {
- key = waiting_char;
- waiting_char = -1;
- }
- else
- {
- #ifdef __RSXNT__
- pc_flush();
- #endif
- key = _read_kbd(0, 1, 0);
- }
- while (key == 0)
- {
- key |= (_read_kbd(0, 1, 0) << 8);
- /* printf("<%04X> ", key);
- fflush(stdout); */
- switch (key)
- {
- case 0x4B00: /* left arrow */
- key = 'B' - 64;
- break;
- case 0x4D00: /* right arrow */
- key = 'F' - 64;
- break;
- case 0x7300: /* ctrl left arrow */
- key = 27;
- waiting_char = 'B';
- break;
- case 0x7400: /* ctrl right arrow */
- key = 27;
- waiting_char = 'F';
- break;
- case 0x4800: /* up arrow */
- key = 'P' - 64;
- break;
- case 0x5000: /* down arrow */
- key = 'N' - 64;
- break;
- case 0x8D00: /* ctrl up arrow */
- key = 'R' - 64;
- break;
- case 0x9100: /* ctrl down arrow */
- key = 'S' - 64;
- break;
- case 0x4700: /* home key */
- key = 'A' - 64;
- break;
- case 0x4F00: /* end key */
- key = 'E' - 64;
- break;
- case 0x7700: /* ctrl home key */
- key = 27;
- waiting_char = '<';
- break;
- case 0x7500: /* ctrl end key */
- key = 27;
- waiting_char = '>';
- break;
- case 0x5300: /* delete key */
- key = 'D' - 64;
- break;
- case 0x5200: /* insert key */
- key = 'V' - 64;
- break;
- default: /* ignore all other special keys, read next */
- key = _read_kbd(0, 1, 0);
- break;
- }
- }
- return (key & 0xFF);
- }
- #endif /* __EMX__ */
- #if defined (__GO32__)
- if (isatty (0))
- return (getkey () & 0x7F);
- #endif /* __GO32__ */
- while (1)
- {
- 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)
- if (errno == EWOULDBLOCK)
- {
- if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0)
- return (EOF);
- if (flags & O_NDELAY)
- {
- flags &= ~O_NDELAY;
- fcntl (fileno (stream), F_SETFL, flags);
- continue;
- }
- continue;
- }
- #endif /* EWOULDBLOCK */
- #if defined (_POSIX_VERSION) && defined (EAGAIN) && defined (O_NONBLOCK)
- if (errno == EAGAIN)
- {
- if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0)
- return (EOF);
- if (flags & O_NONBLOCK)
- {
- flags &= ~O_NONBLOCK;
- fcntl (fileno (stream), F_SETFL, flags);
- continue;
- }
- }
- #endif /* _POSIX_VERSION && EAGAIN && O_NONBLOCK */
- #if !defined (__GO32__)
- /* If the error that we received was SIGINT, then try again,
- this is simply an interrupted system call to read ().
- Otherwise, some error ocurred, also signifying EOF. */
- if (errno != EINTR)
- return (EOF);
- #endif /* !__GO32__ */
- }
- }