338 lines
6.4 KiB
C
338 lines
6.4 KiB
C
/*
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*
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* Another test harness for the readline callback interface.
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*
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* Author: Bob Rossi <bob@brasko.net>
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*/
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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 <stdio.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <curses.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#if 0 /* LINUX */
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#include <pty.h>
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#else
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#include <util.h>
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#endif
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#ifdef READLINE_LIBRARY
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# include "readline.h"
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#else
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# include <readline/readline.h>
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#endif
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/**
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* Master/Slave PTY used to keep readline off of stdin/stdout.
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*/
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static int masterfd = -1;
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static int slavefd;
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void
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sigint (s)
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int s;
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{
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tty_reset (STDIN_FILENO);
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close (masterfd);
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close (slavefd);
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printf ("\n");
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exit (0);
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}
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static int
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user_input()
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{
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int size;
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const int MAX = 1024;
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char *buf = (char *)malloc(MAX+1);
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size = read (STDIN_FILENO, buf, MAX);
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if (size == -1)
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return -1;
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size = write (masterfd, buf, size);
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if (size == -1)
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return -1;
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return 0;
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}
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static int
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readline_input()
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{
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const int MAX = 1024;
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char *buf = (char *)malloc(MAX+1);
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int size;
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size = read (masterfd, buf, MAX);
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if (size == -1)
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{
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free( buf );
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buf = NULL;
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return -1;
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}
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buf[size] = 0;
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/* Display output from readline */
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if ( size > 0 )
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fprintf(stderr, "%s", buf);
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free( buf );
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buf = NULL;
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return 0;
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}
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static void
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rlctx_send_user_command(char *line)
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{
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/* This happens when rl_callback_read_char gets EOF */
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if ( line == NULL )
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return;
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if (strcmp (line, "exit") == 0) {
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tty_reset (STDIN_FILENO);
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close (masterfd);
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close (slavefd);
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printf ("\n");
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exit (0);
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}
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/* Don't add the enter command */
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if ( line && *line != '\0' )
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add_history(line);
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}
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static void
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custom_deprep_term_function ()
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{
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}
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static int
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init_readline (int inputfd, int outputfd)
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{
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FILE *inputFILE, *outputFILE;
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inputFILE = fdopen (inputfd, "r");
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if (!inputFILE)
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return -1;
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outputFILE = fdopen (outputfd, "w");
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if (!outputFILE)
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return -1;
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rl_instream = inputFILE;
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rl_outstream = outputFILE;
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/* Tell readline what the prompt is if it needs to put it back */
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rl_callback_handler_install("(rltest): ", rlctx_send_user_command);
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/* Set the terminal type to dumb so the output of readline can be
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* understood by tgdb */
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if ( rl_reset_terminal("dumb") == -1 )
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return -1;
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/* For some reason, readline can not deprep the terminal.
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* However, it doesn't matter because no other application is working on
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* the terminal besides readline */
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rl_deprep_term_function = custom_deprep_term_function;
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using_history();
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read_history(".history");
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return 0;
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}
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static int
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main_loop(void)
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{
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fd_set rset;
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int max;
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max = (masterfd > STDIN_FILENO) ? masterfd : STDIN_FILENO;
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max = (max > slavefd) ? max : slavefd;
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for (;;)
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{
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/* Reset the fd_set, and watch for input from GDB or stdin */
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FD_ZERO(&rset);
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FD_SET(STDIN_FILENO, &rset);
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FD_SET(slavefd, &rset);
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FD_SET(masterfd, &rset);
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/* Wait for input */
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if (select(max + 1, &rset, NULL, NULL, NULL) == -1)
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{
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if (errno == EINTR)
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continue;
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else
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return -1;
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}
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/* Input received through the pty: Handle it
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* Wrote to masterfd, slave fd has that input, alert readline to read it.
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*/
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if (FD_ISSET(slavefd, &rset))
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rl_callback_read_char();
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/* Input received through the pty.
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* Readline read from slavefd, and it wrote to the masterfd.
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*/
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if (FD_ISSET(masterfd, &rset))
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if ( readline_input() == -1 )
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return -1;
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/* Input received: Handle it, write to masterfd (input to readline) */
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if (FD_ISSET(STDIN_FILENO, &rset))
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if ( user_input() == -1 )
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return -1;
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}
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return 0;
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}
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/* The terminal attributes before calling tty_cbreak */
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static struct termios save_termios;
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static struct winsize size;
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static enum { RESET, TCBREAK } ttystate = RESET;
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/* tty_cbreak: Sets terminal to cbreak mode. Also known as noncanonical mode.
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* 1. Signal handling is still turned on, so the user can still type those.
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* 2. echo is off
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* 3. Read in one char at a time.
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*
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* fd - The file descriptor of the terminal
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*
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* Returns: 0 on sucess, -1 on error
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*/
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int tty_cbreak(int fd){
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struct termios buf;
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int ttysavefd = -1;
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if(tcgetattr(fd, &save_termios) < 0)
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return -1;
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buf = save_termios;
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buf.c_lflag &= ~(ECHO | ICANON);
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buf.c_iflag &= ~(ICRNL | INLCR);
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buf.c_cc[VMIN] = 1;
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buf.c_cc[VTIME] = 0;
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#if defined (VLNEXT) && defined (_POSIX_VDISABLE)
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buf.c_cc[VLNEXT] = _POSIX_VDISABLE;
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#endif
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#if defined (VDSUSP) && defined (_POSIX_VDISABLE)
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buf.c_cc[VDSUSP] = _POSIX_VDISABLE;
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#endif
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/* enable flow control; only stty start char can restart output */
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#if 0
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buf.c_iflag |= (IXON|IXOFF);
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#ifdef IXANY
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buf.c_iflag &= ~IXANY;
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#endif
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#endif
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/* disable flow control; let ^S and ^Q through to pty */
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buf.c_iflag &= ~(IXON|IXOFF);
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#ifdef IXANY
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buf.c_iflag &= ~IXANY;
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#endif
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if(tcsetattr(fd, TCSAFLUSH, &buf) < 0)
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return -1;
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ttystate = TCBREAK;
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ttysavefd = fd;
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/* set size */
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if(ioctl(fd, TIOCGWINSZ, (char *)&size) < 0)
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return -1;
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#ifdef DEBUG
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err_msg("%d rows and %d cols\n", size.ws_row, size.ws_col);
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#endif
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return (0);
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}
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int
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tty_off_xon_xoff (int fd)
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{
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struct termios buf;
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int ttysavefd = -1;
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if(tcgetattr(fd, &buf) < 0)
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return -1;
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buf.c_iflag &= ~(IXON|IXOFF);
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if(tcsetattr(fd, TCSAFLUSH, &buf) < 0)
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return -1;
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return 0;
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}
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/* tty_reset: Sets the terminal attributes back to their previous state.
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* PRE: tty_cbreak must have already been called.
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*
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* fd - The file descrioptor of the terminal to reset.
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*
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* Returns: 0 on success, -1 on error
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*/
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int tty_reset(int fd)
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{
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if(ttystate != TCBREAK)
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return (0);
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if(tcsetattr(fd, TCSAFLUSH, &save_termios) < 0)
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return (-1);
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ttystate = RESET;
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return 0;
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}
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int
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main()
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{
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int val;
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val = openpty (&masterfd, &slavefd, NULL, NULL, NULL);
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if (val == -1)
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return -1;
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val = tty_off_xon_xoff (masterfd);
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if (val == -1)
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return -1;
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val = init_readline (slavefd, slavefd);
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if (val == -1)
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return -1;
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val = tty_cbreak (STDIN_FILENO);
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if (val == -1)
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return -1;
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signal (SIGINT, sigint);
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val = main_loop ();
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tty_reset (STDIN_FILENO);
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if (val == -1)
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return -1;
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return 0;
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}
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