diff options
Diffstat (limited to 'readline/examples/rlptytest.c')
| -rw-r--r-- | readline/examples/rlptytest.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/readline/examples/rlptytest.c b/readline/examples/rlptytest.c new file mode 100644 index 0000000..79257db --- /dev/null +++ b/readline/examples/rlptytest.c @@ -0,0 +1,337 @@ +/* + * + * Another test harness for the readline callback interface. + * + * Author: Bob Rossi <bob@brasko.net> + */ + +#if defined (HAVE_CONFIG_H) +#include <config.h> +#endif + +#include <stdio.h> +#include <sys/types.h> +#include <errno.h> +#include <curses.h> + +#include <stdlib.h> +#include <unistd.h> + +#include <signal.h> + +#if 0 /* LINUX */ +#include <pty.h> +#else +#include <util.h> +#endif + +#ifdef READLINE_LIBRARY +# include "readline.h" +#else +# include <readline/readline.h> +#endif + +/** + * Master/Slave PTY used to keep readline off of stdin/stdout. + */ +static int masterfd = -1; +static int slavefd; + +void +sigint (s) + int s; +{ + tty_reset (STDIN_FILENO); + close (masterfd); + close (slavefd); + printf ("\n"); + exit (0); +} + +static int +user_input() +{ + int size; + const int MAX = 1024; + char *buf = (char *)malloc(MAX+1); + + size = read (STDIN_FILENO, buf, MAX); + if (size == -1) + return -1; + + size = write (masterfd, buf, size); + if (size == -1) + return -1; + + return 0; +} + +static int +readline_input() +{ + const int MAX = 1024; + char *buf = (char *)malloc(MAX+1); + int size; + + size = read (masterfd, buf, MAX); + if (size == -1) + { + free( buf ); + buf = NULL; + return -1; + } + + buf[size] = 0; + + /* Display output from readline */ + if ( size > 0 ) + fprintf(stderr, "%s", buf); + + free( buf ); + buf = NULL; + return 0; +} + +static void +rlctx_send_user_command(char *line) +{ + /* This happens when rl_callback_read_char gets EOF */ + if ( line == NULL ) + return; + + if (strcmp (line, "exit") == 0) { + tty_reset (STDIN_FILENO); + close (masterfd); + close (slavefd); + printf ("\n"); + exit (0); + } + + /* Don't add the enter command */ + if ( line && *line != '\0' ) + add_history(line); +} + +static void +custom_deprep_term_function () +{ +} + +static int +init_readline (int inputfd, int outputfd) +{ + FILE *inputFILE, *outputFILE; + + inputFILE = fdopen (inputfd, "r"); + if (!inputFILE) + return -1; + + outputFILE = fdopen (outputfd, "w"); + if (!outputFILE) + return -1; + + rl_instream = inputFILE; + rl_outstream = outputFILE; + + /* Tell readline what the prompt is if it needs to put it back */ + rl_callback_handler_install("(rltest): ", rlctx_send_user_command); + + /* Set the terminal type to dumb so the output of readline can be + * understood by tgdb */ + if ( rl_reset_terminal("dumb") == -1 ) + return -1; + + /* For some reason, readline can not deprep the terminal. + * However, it doesn't matter because no other application is working on + * the terminal besides readline */ + rl_deprep_term_function = custom_deprep_term_function; + + using_history(); + read_history(".history"); + + return 0; +} + +static int +main_loop(void) +{ + fd_set rset; + int max; + + max = (masterfd > STDIN_FILENO) ? masterfd : STDIN_FILENO; + max = (max > slavefd) ? max : slavefd; + + for (;;) + { + /* Reset the fd_set, and watch for input from GDB or stdin */ + FD_ZERO(&rset); + + FD_SET(STDIN_FILENO, &rset); + FD_SET(slavefd, &rset); + FD_SET(masterfd, &rset); + + /* Wait for input */ + if (select(max + 1, &rset, NULL, NULL, NULL) == -1) + { + if (errno == EINTR) + continue; + else + return -1; + } + + /* Input received through the pty: Handle it + * Wrote to masterfd, slave fd has that input, alert readline to read it. + */ + if (FD_ISSET(slavefd, &rset)) + rl_callback_read_char(); + + /* Input received through the pty. + * Readline read from slavefd, and it wrote to the masterfd. + */ + if (FD_ISSET(masterfd, &rset)) + if ( readline_input() == -1 ) + return -1; + + /* Input received: Handle it, write to masterfd (input to readline) */ + if (FD_ISSET(STDIN_FILENO, &rset)) + if ( user_input() == -1 ) + return -1; + } + + return 0; +} + +/* The terminal attributes before calling tty_cbreak */ +static struct termios save_termios; +static struct winsize size; +static enum { RESET, TCBREAK } ttystate = RESET; + +/* tty_cbreak: Sets terminal to cbreak mode. Also known as noncanonical mode. + * 1. Signal handling is still turned on, so the user can still type those. + * 2. echo is off + * 3. Read in one char at a time. + * + * fd - The file descriptor of the terminal + * + * Returns: 0 on sucess, -1 on error + */ +int tty_cbreak(int fd){ + struct termios buf; + int ttysavefd = -1; + + if(tcgetattr(fd, &save_termios) < 0) + return -1; + + buf = save_termios; + buf.c_lflag &= ~(ECHO | ICANON); + buf.c_iflag &= ~(ICRNL | INLCR); + buf.c_cc[VMIN] = 1; + buf.c_cc[VTIME] = 0; + +#if defined (VLNEXT) && defined (_POSIX_VDISABLE) + buf.c_cc[VLNEXT] = _POSIX_VDISABLE; +#endif + +#if defined (VDSUSP) && defined (_POSIX_VDISABLE) + buf.c_cc[VDSUSP] = _POSIX_VDISABLE; +#endif + + /* enable flow control; only stty start char can restart output */ +#if 0 + buf.c_iflag |= (IXON|IXOFF); +#ifdef IXANY + buf.c_iflag &= ~IXANY; +#endif +#endif + + /* disable flow control; let ^S and ^Q through to pty */ + buf.c_iflag &= ~(IXON|IXOFF); +#ifdef IXANY + buf.c_iflag &= ~IXANY; +#endif + + if(tcsetattr(fd, TCSAFLUSH, &buf) < 0) + return -1; + + ttystate = TCBREAK; + ttysavefd = fd; + + /* set size */ + if(ioctl(fd, TIOCGWINSZ, (char *)&size) < 0) + return -1; + +#ifdef DEBUG + err_msg("%d rows and %d cols\n", size.ws_row, size.ws_col); +#endif + + return (0); +} + +int +tty_off_xon_xoff (int fd) +{ + struct termios buf; + int ttysavefd = -1; + + if(tcgetattr(fd, &buf) < 0) + return -1; + + buf.c_iflag &= ~(IXON|IXOFF); + + if(tcsetattr(fd, TCSAFLUSH, &buf) < 0) + return -1; + + return 0; +} + +/* tty_reset: Sets the terminal attributes back to their previous state. + * PRE: tty_cbreak must have already been called. + * + * fd - The file descrioptor of the terminal to reset. + * + * Returns: 0 on success, -1 on error + */ +int tty_reset(int fd) +{ + if(ttystate != TCBREAK) + return (0); + + if(tcsetattr(fd, TCSAFLUSH, &save_termios) < 0) + return (-1); + + ttystate = RESET; + + return 0; +} + +int +main() +{ + int val; + val = openpty (&masterfd, &slavefd, NULL, NULL, NULL); + if (val == -1) + return -1; + + val = tty_off_xon_xoff (masterfd); + if (val == -1) + return -1; + + val = init_readline (slavefd, slavefd); + if (val == -1) + return -1; + + val = tty_cbreak (STDIN_FILENO); + if (val == -1) + return -1; + + signal (SIGINT, sigint); + + val = main_loop (); + + tty_reset (STDIN_FILENO); + + if (val == -1) + return -1; + + return 0; +} |