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-rw-r--r--readline/input.c449
1 files changed, 449 insertions, 0 deletions
diff --git a/readline/input.c b/readline/input.c
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+/* 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)
+# 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;
+}
+
+/* Add KEY to the buffer of characters to be read. */
+int
+rl_stuff_char (key)
+ int key;
+{
+ if (key == EOF)
+ {
+ key = NEWLINE;
+ rl_pending_input = EOF;
+ }
+ ibuffer[push_index++] = key;
+ if (push_index >= ibuffer_len)
+ push_index = 0;
+ return push_index;
+}
+
+/* Make C be the next command to be executed. */
+int
+rl_execute_next (c)
+ int c;
+{
+ rl_pending_input = c;
+ return 0;
+}
+
+/* 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);
+ 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 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 (__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(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
+
+ 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] = '\0';
+ rl_insert_text (string);
+ free (string);
+}
+
+/* **************************************************************** */
+/* */
+/* 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 (__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 (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__ */
+ }
+}