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Diffstat (limited to 'contrib/libreadline/examples/rlfe/rlfe.c')
-rw-r--r--contrib/libreadline/examples/rlfe/rlfe.c780
1 files changed, 0 insertions, 780 deletions
diff --git a/contrib/libreadline/examples/rlfe/rlfe.c b/contrib/libreadline/examples/rlfe/rlfe.c
deleted file mode 100644
index 6d747dcb42ec..000000000000
--- a/contrib/libreadline/examples/rlfe/rlfe.c
+++ /dev/null
@@ -1,780 +0,0 @@
-/* A front-end using readline to "cook" input lines.
- *
- * Copyright (C) 2004, 1999 Per Bothner
- *
- * This front-end program 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.
- *
- * Some code from Johnson & Troan: "Linux Application Development"
- * (Addison-Wesley, 1998) was used directly or for inspiration.
- *
- * 2003-11-07 Wolfgang Taeuber <wolfgang_taeuber@agilent.com>
- * Specify a history file and the size of the history file with command
- * line options; use EDITOR/VISUAL to set vi/emacs preference.
- */
-
-/* PROBLEMS/TODO:
- *
- * Only tested under GNU/Linux and Mac OS 10.x; needs to be ported.
- *
- * Switching between line-editing-mode vs raw-char-mode depending on
- * what tcgetattr returns is inherently not robust, plus it doesn't
- * work when ssh/telnetting in. A better solution is possible if the
- * tty system can send in-line escape sequences indicating the current
- * mode, echo'd input, etc. That would also allow a user preference
- * to set different colors for prompt, input, stdout, and stderr.
- *
- * When running mc -c under the Linux console, mc does not recognize
- * mouse clicks, which mc does when not running under rlfe.
- *
- * Pasting selected text containing tabs is like hitting the tab character,
- * which invokes readline completion. We don't want this. I don't know
- * if this is fixable without integrating rlfe into a terminal emulator.
- *
- * Echo suppression is a kludge, but can only be avoided with better kernel
- * support: We need a tty mode to disable "real" echoing, while still
- * letting the inferior think its tty driver to doing echoing.
- * Stevens's book claims SCR$ and BSD4.3+ have TIOCREMOTE.
- *
- * The latest readline may have some hooks we can use to avoid having
- * to back up the prompt. (See HAVE_ALREADY_PROMPTED.)
- *
- * Desirable readline feature: When in cooked no-echo mode (e.g. password),
- * echo characters are they are types with '*', but remove them when done.
- *
- * Asynchronous output while we're editing an input line should be
- * inserted in the output view *before* the input line, so that the
- * lines being edited (with the prompt) float at the end of the input.
- *
- * A "page mode" option to emulate more/less behavior: At each page of
- * output, pause for a user command. This required parsing the output
- * to keep track of line lengths. It also requires remembering the
- * output, if we want an option to scroll back, which suggests that
- * this should be integrated with a terminal emulator like xterm.
- */
-
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <netdb.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <grp.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-#include <termios.h>
-
-#include "config.h"
-
-#ifdef READLINE_LIBRARY
-# include "readline.h"
-# include "history.h"
-#else
-# include <readline/readline.h>
-# include <readline/history.h>
-#endif
-
-#ifndef COMMAND
-#define COMMAND "/bin/bash"
-#endif
-#ifndef COMMAND_ARGS
-#define COMMAND_ARGS COMMAND
-#endif
-
-#ifndef ALT_COMMAND
-#define ALT_COMMAND "/bin/sh"
-#endif
-#ifndef ALT_COMMAND_ARGS
-#define ALT_COMMAND_ARGS ALT_COMMAND
-#endif
-
-#ifndef HAVE_MEMMOVE
-# if __GNUC__ > 1
-# define memmove(d, s, n) __builtin_memcpy(d, s, n)
-# else
-# define memmove(d, s, n) memcpy(d, s, n)
-# endif
-#else
-# define memmove(d, s, n) memcpy(d, s, n)
-#endif
-
-#define APPLICATION_NAME "rlfe"
-
-static int in_from_inferior_fd;
-static int out_to_inferior_fd;
-static void set_edit_mode ();
-static void usage_exit ();
-static char *hist_file = 0;
-static int hist_size = 0;
-
-/* Unfortunately, we cannot safely display echo from the inferior process.
- The reason is that the echo bit in the pty is "owned" by the inferior,
- and if we try to turn it off, we could confuse the inferior.
- Thus, when echoing, we get echo twice: First readline echoes while
- we're actually editing. Then we send the line to the inferior, and the
- terminal driver send back an extra echo.
- The work-around is to remember the input lines, and when we see that
- line come back, we supress the output.
- A better solution (supposedly available on SVR4) would be a smarter
- terminal driver, with more flags ... */
-#define ECHO_SUPPRESS_MAX 1024
-char echo_suppress_buffer[ECHO_SUPPRESS_MAX];
-int echo_suppress_start = 0;
-int echo_suppress_limit = 0;
-
-/*#define DEBUG*/
-
-#ifdef DEBUG
-FILE *logfile = NULL;
-#define DPRINT0(FMT) (fprintf(logfile, FMT), fflush(logfile))
-#define DPRINT1(FMT, V1) (fprintf(logfile, FMT, V1), fflush(logfile))
-#define DPRINT2(FMT, V1, V2) (fprintf(logfile, FMT, V1, V2), fflush(logfile))
-#else
-#define DPRINT0(FMT) ((void) 0) /* Do nothing */
-#define DPRINT1(FMT, V1) ((void) 0) /* Do nothing */
-#define DPRINT2(FMT, V1, V2) ((void) 0) /* Do nothing */
-#endif
-
-struct termios orig_term;
-
-/* Pid of child process. */
-static pid_t child = -1;
-
-static void
-sig_child (int signo)
-{
- int status;
- wait (&status);
- if (hist_file != 0)
- {
- write_history (hist_file);
- if (hist_size)
- history_truncate_file (hist_file, hist_size);
- }
- DPRINT0 ("(Child process died.)\n");
- tcsetattr(STDIN_FILENO, TCSANOW, &orig_term);
- exit (0);
-}
-
-volatile int propagate_sigwinch = 0;
-
-/* sigwinch_handler
- * propagate window size changes from input file descriptor to
- * master side of pty.
- */
-void sigwinch_handler(int signal) {
- propagate_sigwinch = 1;
-}
-
-
-/* get_slave_pty() returns an integer file descriptor.
- * If it returns < 0, an error has occurred.
- * Otherwise, it has returned the slave file descriptor.
- */
-
-int get_slave_pty(char *name) {
- struct group *gptr;
- gid_t gid;
- int slave = -1;
-
- /* chown/chmod the corresponding pty, if possible.
- * This will only work if the process has root permissions.
- * Alternatively, write and exec a small setuid program that
- * does just this.
- */
- if ((gptr = getgrnam("tty")) != 0) {
- gid = gptr->gr_gid;
- } else {
- /* if the tty group does not exist, don't change the
- * group on the slave pty, only the owner
- */
- gid = -1;
- }
-
- /* Note that we do not check for errors here. If this is code
- * where these actions are critical, check for errors!
- */
- chown(name, getuid(), gid);
- /* This code only makes the slave read/writeable for the user.
- * If this is for an interactive shell that will want to
- * receive "write" and "wall" messages, OR S_IWGRP into the
- * second argument below.
- */
- chmod(name, S_IRUSR|S_IWUSR);
-
- /* open the corresponding slave pty */
- slave = open(name, O_RDWR);
- return (slave);
-}
-
-/* Certain special characters, such as ctrl/C, we want to pass directly
- to the inferior, rather than letting readline handle them. */
-
-static char special_chars[20];
-static int special_chars_count;
-
-static void
-add_special_char(int ch)
-{
- if (ch != 0)
- special_chars[special_chars_count++] = ch;
-}
-
-static int eof_char;
-
-static int
-is_special_char(int ch)
-{
- int i;
-#if 0
- if (ch == eof_char && rl_point == rl_end)
- return 1;
-#endif
- for (i = special_chars_count; --i >= 0; )
- if (special_chars[i] == ch)
- return 1;
- return 0;
-}
-
-static char buf[1024];
-/* buf[0 .. buf_count-1] is the what has been emitted on the current line.
- It is used as the readline prompt. */
-static int buf_count = 0;
-
-int do_emphasize_input = 1;
-int current_emphasize_input;
-
-char *start_input_mode = "\033[1m";
-char *end_input_mode = "\033[0m";
-
-int num_keys = 0;
-
-static void maybe_emphasize_input (int on)
-{
- if (on == current_emphasize_input
- || (on && ! do_emphasize_input))
- return;
- fprintf (rl_outstream, on ? start_input_mode : end_input_mode);
- fflush (rl_outstream);
- current_emphasize_input = on;
-}
-
-static void
-null_prep_terminal (int meta)
-{
-}
-
-static void
-null_deprep_terminal ()
-{
- maybe_emphasize_input (0);
-}
-
-static int
-pre_input_change_mode (void)
-{
- return 0;
-}
-
-char pending_special_char;
-
-static void
-line_handler (char *line)
-{
- if (line == NULL)
- {
- char buf[1];
- DPRINT0("saw eof!\n");
- buf[0] = '\004'; /* ctrl/d */
- write (out_to_inferior_fd, buf, 1);
- }
- else
- {
- static char enter[] = "\r";
- /* Send line to inferior: */
- int length = strlen (line);
- if (length > ECHO_SUPPRESS_MAX-2)
- {
- echo_suppress_start = 0;
- echo_suppress_limit = 0;
- }
- else
- {
- if (echo_suppress_limit + length > ECHO_SUPPRESS_MAX - 2)
- {
- if (echo_suppress_limit - echo_suppress_start + length
- <= ECHO_SUPPRESS_MAX - 2)
- {
- memmove (echo_suppress_buffer,
- echo_suppress_buffer + echo_suppress_start,
- echo_suppress_limit - echo_suppress_start);
- echo_suppress_limit -= echo_suppress_start;
- echo_suppress_start = 0;
- }
- else
- {
- echo_suppress_limit = 0;
- }
- echo_suppress_start = 0;
- }
- memcpy (echo_suppress_buffer + echo_suppress_limit,
- line, length);
- echo_suppress_limit += length;
- echo_suppress_buffer[echo_suppress_limit++] = '\r';
- echo_suppress_buffer[echo_suppress_limit++] = '\n';
- }
- write (out_to_inferior_fd, line, length);
- if (pending_special_char == 0)
- {
- write (out_to_inferior_fd, enter, sizeof(enter)-1);
- if (*line)
- add_history (line);
- }
- free (line);
- }
- rl_callback_handler_remove ();
- buf_count = 0;
- num_keys = 0;
- if (pending_special_char != 0)
- {
- write (out_to_inferior_fd, &pending_special_char, 1);
- pending_special_char = 0;
- }
-}
-
-/* Value of rl_getc_function.
- Use this because readline should read from stdin, not rl_instream,
- points to the pty (so readline has monitor its terminal modes). */
-
-int
-my_rl_getc (FILE *dummy)
-{
- int ch = rl_getc (stdin);
- if (is_special_char (ch))
- {
- pending_special_char = ch;
- return '\r';
- }
- return ch;
-}
-
-int
-main(int argc, char** argv)
-{
- char *path;
- int i;
- int master;
- char *name;
- int in_from_tty_fd;
- struct sigaction act;
- struct winsize ws;
- struct termios t;
- int maxfd;
- fd_set in_set;
- static char empty_string[1] = "";
- char *prompt = empty_string;
- int ioctl_err = 0;
- int arg_base = 1;
-
-#ifdef DEBUG
- logfile = fopen("/tmp/rlfe.log", "w");
-#endif
-
- while (arg_base<argc)
- {
- if (argv[arg_base][0] != '-')
- break;
- if (arg_base+1 >= argc )
- usage_exit();
- switch(argv[arg_base][1])
- {
- case 'h':
- arg_base++;
- hist_file = argv[arg_base];
- break;
- case 's':
- arg_base++;
- hist_size = atoi(argv[arg_base]);
- if (hist_size<0)
- usage_exit();
- break;
- default:
- usage_exit();
- }
- arg_base++;
- }
- if (hist_file)
- read_history (hist_file);
-
- set_edit_mode ();
-
- rl_readline_name = APPLICATION_NAME;
-
- if ((master = OpenPTY (&name)) < 0)
- {
- perror("ptypair: could not open master pty");
- exit(1);
- }
-
- DPRINT1("pty name: '%s'\n", name);
-
- /* set up SIGWINCH handler */
- act.sa_handler = sigwinch_handler;
- sigemptyset(&(act.sa_mask));
- act.sa_flags = 0;
- if (sigaction(SIGWINCH, &act, NULL) < 0)
- {
- perror("ptypair: could not handle SIGWINCH ");
- exit(1);
- }
-
- if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0)
- {
- perror("ptypair: could not get window size");
- exit(1);
- }
-
- if ((child = fork()) < 0)
- {
- perror("cannot fork");
- exit(1);
- }
-
- if (child == 0)
- {
- int slave; /* file descriptor for slave pty */
-
- /* We are in the child process */
- close(master);
-
-#ifdef TIOCSCTTY
- if ((slave = get_slave_pty(name)) < 0)
- {
- perror("ptypair: could not open slave pty");
- exit(1);
- }
-#endif
-
- /* We need to make this process a session group leader, because
- * it is on a new PTY, and things like job control simply will
- * not work correctly unless there is a session group leader
- * and process group leader (which a session group leader
- * automatically is). This also disassociates us from our old
- * controlling tty.
- */
- if (setsid() < 0)
- {
- perror("could not set session leader");
- }
-
- /* Tie us to our new controlling tty. */
-#ifdef TIOCSCTTY
- if (ioctl(slave, TIOCSCTTY, NULL))
- {
- perror("could not set new controlling tty");
- }
-#else
- if ((slave = get_slave_pty(name)) < 0)
- {
- perror("ptypair: could not open slave pty");
- exit(1);
- }
-#endif
-
- /* make slave pty be standard in, out, and error */
- dup2(slave, STDIN_FILENO);
- dup2(slave, STDOUT_FILENO);
- dup2(slave, STDERR_FILENO);
-
- /* at this point the slave pty should be standard input */
- if (slave > 2)
- {
- close(slave);
- }
-
- /* Try to restore window size; failure isn't critical */
- if (ioctl(STDOUT_FILENO, TIOCSWINSZ, &ws) < 0)
- {
- perror("could not restore window size");
- }
-
- /* now start the shell */
- {
- static char* command_args[] = { COMMAND_ARGS, NULL };
- static char* alt_command_args[] = { ALT_COMMAND_ARGS, NULL };
- if (argc <= 1)
- {
- execvp (COMMAND, command_args);
- execvp (ALT_COMMAND, alt_command_args);
- }
- else
- execvp (argv[arg_base], &argv[arg_base]);
- }
-
- /* should never be reached */
- exit(1);
- }
-
- /* parent */
- signal (SIGCHLD, sig_child);
-
- /* Note that we only set termios settings for standard input;
- * the master side of a pty is NOT a tty.
- */
- tcgetattr(STDIN_FILENO, &orig_term);
-
- t = orig_term;
- eof_char = t.c_cc[VEOF];
- /* add_special_char(t.c_cc[VEOF]);*/
- add_special_char(t.c_cc[VINTR]);
- add_special_char(t.c_cc[VQUIT]);
- add_special_char(t.c_cc[VSUSP]);
-#if defined (VDISCARD)
- add_special_char(t.c_cc[VDISCARD]);
-#endif
-
- t.c_lflag &= ~(ICANON | ISIG | ECHO | ECHOCTL | ECHOE | \
- ECHOK | ECHOKE | ECHONL | ECHOPRT );
- t.c_iflag &= ~ICRNL;
- t.c_iflag |= IGNBRK;
- t.c_cc[VMIN] = 1;
- t.c_cc[VTIME] = 0;
- tcsetattr(STDIN_FILENO, TCSANOW, &t);
- in_from_inferior_fd = master;
- out_to_inferior_fd = master;
- rl_instream = fdopen (master, "r");
- rl_getc_function = my_rl_getc;
-
- rl_prep_term_function = null_prep_terminal;
- rl_deprep_term_function = null_deprep_terminal;
- rl_pre_input_hook = pre_input_change_mode;
- rl_callback_handler_install (prompt, line_handler);
-
- in_from_tty_fd = STDIN_FILENO;
- FD_ZERO (&in_set);
- maxfd = in_from_inferior_fd > in_from_tty_fd ? in_from_inferior_fd
- : in_from_tty_fd;
- for (;;)
- {
- int num;
- FD_SET (in_from_inferior_fd, &in_set);
- FD_SET (in_from_tty_fd, &in_set);
-
- num = select(maxfd+1, &in_set, NULL, NULL, NULL);
-
- if (propagate_sigwinch)
- {
- struct winsize ws;
- if (ioctl (STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
- {
- ioctl (master, TIOCSWINSZ, &ws);
- }
- propagate_sigwinch = 0;
- continue;
- }
-
- if (num <= 0)
- {
- perror ("select");
- exit (-1);
- }
- if (FD_ISSET (in_from_tty_fd, &in_set))
- {
- extern int readline_echoing_p;
- struct termios term_master;
- int do_canon = 1;
- int do_icrnl = 1;
- int ioctl_ret;
-
- DPRINT1("[tty avail num_keys:%d]\n", num_keys);
-
- /* If we can't get tty modes for the master side of the pty, we
- can't handle non-canonical-mode programs. Always assume the
- master is in canonical echo mode if we can't tell. */
- ioctl_ret = tcgetattr(master, &term_master);
-
- if (ioctl_ret >= 0)
- {
- do_canon = (term_master.c_lflag & ICANON) != 0;
- do_icrnl = (term_master.c_lflag & ICRNL) != 0;
- readline_echoing_p = (term_master.c_lflag & ECHO) != 0;
- DPRINT1 ("echo,canon,crnl:%03d\n",
- 100 * readline_echoing_p
- + 10 * do_canon
- + 1 * do_icrnl);
- }
- else
- {
- if (ioctl_err == 0)
- DPRINT1("tcgetattr on master fd failed: errno = %d\n", errno);
- ioctl_err = 1;
- }
-
- if (do_canon == 0 && num_keys == 0)
- {
- char ch[10];
- int count = read (STDIN_FILENO, ch, sizeof(ch));
- DPRINT1("[read %d chars from stdin: ", count);
- DPRINT2(" \"%.*s\"]\n", count, ch);
- if (do_icrnl)
- {
- int i = count;
- while (--i >= 0)
- {
- if (ch[i] == '\r')
- ch[i] = '\n';
- }
- }
- maybe_emphasize_input (1);
- write (out_to_inferior_fd, ch, count);
- }
- else
- {
- if (num_keys == 0)
- {
- int i;
- /* Re-install callback handler for new prompt. */
- if (prompt != empty_string)
- free (prompt);
- if (prompt == NULL)
- {
- DPRINT0("New empty prompt\n");
- prompt = empty_string;
- }
- else
- {
- if (do_emphasize_input && buf_count > 0)
- {
- prompt = malloc (buf_count + strlen (end_input_mode)
- + strlen (start_input_mode) + 5);
- sprintf (prompt, "\001%s\002%.*s\001%s\002",
- end_input_mode,
- buf_count, buf,
- start_input_mode);
- }
- else
- {
- prompt = malloc (buf_count + 1);
- memcpy (prompt, buf, buf_count);
- prompt[buf_count] = '\0';
- }
- DPRINT1("New prompt '%s'\n", prompt);
-#if 0 /* ifdef HAVE_RL_ALREADY_PROMPTED */
- /* Doesn't quite work when do_emphasize_input is 1. */
- rl_already_prompted = buf_count > 0;
-#else
- if (buf_count > 0)
- write (1, "\r", 1);
-#endif
- }
-
- rl_callback_handler_install (prompt, line_handler);
- }
- num_keys++;
- maybe_emphasize_input (1);
- rl_callback_read_char ();
- }
- }
- else /* output from inferior. */
- {
- int i;
- int count;
- int old_count;
- if (buf_count > (sizeof(buf) >> 2))
- buf_count = 0;
- count = read (in_from_inferior_fd, buf+buf_count,
- sizeof(buf) - buf_count);
- DPRINT2("read %d from inferior, buf_count=%d", count, buf_count);
- DPRINT2(": \"%.*s\"", count, buf+buf_count);
- maybe_emphasize_input (0);
- if (count <= 0)
- {
- DPRINT0 ("(Connection closed by foreign host.)\n");
- tcsetattr(STDIN_FILENO, TCSANOW, &orig_term);
- exit (0);
- }
- old_count = buf_count;
-
- /* Look for any pending echo that we need to suppress. */
- while (echo_suppress_start < echo_suppress_limit
- && count > 0
- && buf[buf_count] == echo_suppress_buffer[echo_suppress_start])
- {
- count--;
- buf_count++;
- echo_suppress_start++;
- }
- DPRINT1("suppressed %d characters of echo.\n", buf_count-old_count);
-
- /* Write to the terminal anything that was not suppressed. */
- if (count > 0)
- write (1, buf + buf_count, count);
-
- /* Finally, look for a prompt candidate.
- * When we get around to going input (from the keyboard),
- * we will consider the prompt to be anything since the last
- * line terminator. So we need to save that text in the
- * initial part of buf. However, anything before the
- * most recent end-of-line is not interesting. */
- buf_count += count;
-#if 1
- for (i = buf_count; --i >= old_count; )
-#else
- for (i = buf_count - 1; i-- >= buf_count - count; )
-#endif
- {
- if (buf[i] == '\n' || buf[i] == '\r')
- {
- i++;
- memmove (buf, buf+i, buf_count - i);
- buf_count -= i;
- break;
- }
- }
- DPRINT2("-> i: %d, buf_count: %d\n", i, buf_count);
- }
- }
-}
-
-static void set_edit_mode ()
-{
- int vi = 0;
- char *shellopts;
-
- shellopts = getenv ("SHELLOPTS");
- while (shellopts != 0)
- {
- if (strncmp ("vi", shellopts, 2) == 0)
- {
- vi = 1;
- break;
- }
- shellopts = index (shellopts + 1, ':');
- }
-
- if (!vi)
- {
- if (getenv ("EDITOR") != 0)
- vi |= strcmp (getenv ("EDITOR"), "vi") == 0;
- }
-
- if (vi)
- rl_variable_bind ("editing-mode", "vi");
- else
- rl_variable_bind ("editing-mode", "emacs");
-}
-
-
-static void usage_exit ()
-{
- fprintf (stderr, "Usage: rlfe [-h histfile] [-s size] cmd [arg1] [arg2] ...\n\n");
- exit (1);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-14 17:44:13 +0000