| 1 | /* A front-end using readline to "cook" input lines. |
| 2 | * |
| 3 | * Copyright (C) 2004, 1999 Per Bothner |
| 4 | * |
| 5 | * This front-end program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as published |
| 7 | * by the Free Software Foundation; either version 2, or (at your option) |
| 8 | * any later version. |
| 9 | * |
| 10 | * Some code from Johnson & Troan: "Linux Application Development" |
| 11 | * (Addison-Wesley, 1998) was used directly or for inspiration. |
| 12 | * |
| 13 | * 2003-11-07 Wolfgang Taeuber <wolfgang_taeuber@agilent.com> |
| 14 | * Specify a history file and the size of the history file with command |
| 15 | * line options; use EDITOR/VISUAL to set vi/emacs preference. |
| 16 | */ |
| 17 | |
| 18 | /* PROBLEMS/TODO: |
| 19 | * |
| 20 | * Only tested under GNU/Linux and Mac OS 10.x; needs to be ported. |
| 21 | * |
| 22 | * Switching between line-editing-mode vs raw-char-mode depending on |
| 23 | * what tcgetattr returns is inherently not robust, plus it doesn't |
| 24 | * work when ssh/telnetting in. A better solution is possible if the |
| 25 | * tty system can send in-line escape sequences indicating the current |
| 26 | * mode, echo'd input, etc. That would also allow a user preference |
| 27 | * to set different colors for prompt, input, stdout, and stderr. |
| 28 | * |
| 29 | * When running mc -c under the Linux console, mc does not recognize |
| 30 | * mouse clicks, which mc does when not running under rlfe. |
| 31 | * |
| 32 | * Pasting selected text containing tabs is like hitting the tab character, |
| 33 | * which invokes readline completion. We don't want this. I don't know |
| 34 | * if this is fixable without integrating rlfe into a terminal emulator. |
| 35 | * |
| 36 | * Echo suppression is a kludge, but can only be avoided with better kernel |
| 37 | * support: We need a tty mode to disable "real" echoing, while still |
| 38 | * letting the inferior think its tty driver to doing echoing. |
| 39 | * Stevens's book claims SCR$ and BSD4.3+ have TIOCREMOTE. |
| 40 | * |
| 41 | * The latest readline may have some hooks we can use to avoid having |
| 42 | * to back up the prompt. (See HAVE_ALREADY_PROMPTED.) |
| 43 | * |
| 44 | * Desirable readline feature: When in cooked no-echo mode (e.g. password), |
| 45 | * echo characters are they are types with '*', but remove them when done. |
| 46 | * |
| 47 | * Asynchronous output while we're editing an input line should be |
| 48 | * inserted in the output view *before* the input line, so that the |
| 49 | * lines being edited (with the prompt) float at the end of the input. |
| 50 | * |
| 51 | * A "page mode" option to emulate more/less behavior: At each page of |
| 52 | * output, pause for a user command. This required parsing the output |
| 53 | * to keep track of line lengths. It also requires remembering the |
| 54 | * output, if we want an option to scroll back, which suggests that |
| 55 | * this should be integrated with a terminal emulator like xterm. |
| 56 | */ |
| 57 | |
| 58 | #include <stdio.h> |
| 59 | #include <fcntl.h> |
| 60 | #include <sys/types.h> |
| 61 | #include <sys/socket.h> |
| 62 | #include <netinet/in.h> |
| 63 | #include <arpa/inet.h> |
| 64 | #include <signal.h> |
| 65 | #include <netdb.h> |
| 66 | #include <stdlib.h> |
| 67 | #include <errno.h> |
| 68 | #include <grp.h> |
| 69 | #include <string.h> |
| 70 | #include <sys/stat.h> |
| 71 | #include <unistd.h> |
| 72 | #include <sys/ioctl.h> |
| 73 | #include <termios.h> |
| 74 | |
| 75 | #include "config.h" |
| 76 | #include "extern.h" |
| 77 | |
| 78 | #if defined (HAVE_SYS_WAIT_H) |
| 79 | # include <sys/wait.h> |
| 80 | #endif |
| 81 | |
| 82 | #ifdef READLINE_LIBRARY |
| 83 | # include "readline.h" |
| 84 | # include "history.h" |
| 85 | #else |
| 86 | # include <readline/readline.h> |
| 87 | # include <readline/history.h> |
| 88 | #endif |
| 89 | |
| 90 | #ifndef COMMAND |
| 91 | #define COMMAND "/bin/bash" |
| 92 | #endif |
| 93 | #ifndef COMMAND_ARGS |
| 94 | #define COMMAND_ARGS COMMAND |
| 95 | #endif |
| 96 | |
| 97 | #ifndef ALT_COMMAND |
| 98 | #define ALT_COMMAND "/bin/sh" |
| 99 | #endif |
| 100 | #ifndef ALT_COMMAND_ARGS |
| 101 | #define ALT_COMMAND_ARGS ALT_COMMAND |
| 102 | #endif |
| 103 | |
| 104 | #ifndef HAVE_MEMMOVE |
| 105 | # if __GNUC__ > 1 |
| 106 | # define memmove(d, s, n) __builtin_memcpy(d, s, n) |
| 107 | # else |
| 108 | # define memmove(d, s, n) memcpy(d, s, n) |
| 109 | # endif |
| 110 | #else |
| 111 | # define memmove(d, s, n) memcpy(d, s, n) |
| 112 | #endif |
| 113 | |
| 114 | #define APPLICATION_NAME "rlfe" |
| 115 | |
| 116 | static int in_from_inferior_fd; |
| 117 | static int out_to_inferior_fd; |
| 118 | static void set_edit_mode (); |
| 119 | static void usage_exit (); |
| 120 | static char *hist_file = 0; |
| 121 | static int hist_size = 0; |
| 122 | |
| 123 | /* Unfortunately, we cannot safely display echo from the inferior process. |
| 124 | The reason is that the echo bit in the pty is "owned" by the inferior, |
| 125 | and if we try to turn it off, we could confuse the inferior. |
| 126 | Thus, when echoing, we get echo twice: First readline echoes while |
| 127 | we're actually editing. Then we send the line to the inferior, and the |
| 128 | terminal driver send back an extra echo. |
| 129 | The work-around is to remember the input lines, and when we see that |
| 130 | line come back, we supress the output. |
| 131 | A better solution (supposedly available on SVR4) would be a smarter |
| 132 | terminal driver, with more flags ... */ |
| 133 | #define ECHO_SUPPRESS_MAX 1024 |
| 134 | char echo_suppress_buffer[ECHO_SUPPRESS_MAX]; |
| 135 | int echo_suppress_start = 0; |
| 136 | int echo_suppress_limit = 0; |
| 137 | |
| 138 | /*#define DEBUG*/ |
| 139 | |
| 140 | #ifdef DEBUG |
| 141 | FILE *logfile = NULL; |
| 142 | #define DPRINT0(FMT) (fprintf(logfile, FMT), fflush(logfile)) |
| 143 | #define DPRINT1(FMT, V1) (fprintf(logfile, FMT, V1), fflush(logfile)) |
| 144 | #define DPRINT2(FMT, V1, V2) (fprintf(logfile, FMT, V1, V2), fflush(logfile)) |
| 145 | #else |
| 146 | #define DPRINT0(FMT) ((void) 0) /* Do nothing */ |
| 147 | #define DPRINT1(FMT, V1) ((void) 0) /* Do nothing */ |
| 148 | #define DPRINT2(FMT, V1, V2) ((void) 0) /* Do nothing */ |
| 149 | #endif |
| 150 | |
| 151 | struct termios orig_term; |
| 152 | |
| 153 | /* Pid of child process. */ |
| 154 | static pid_t child = -1; |
| 155 | |
| 156 | static void |
| 157 | sig_child (int signo) |
| 158 | { |
| 159 | int status; |
| 160 | wait (&status); |
| 161 | if (hist_file != 0) |
| 162 | { |
| 163 | write_history (hist_file); |
| 164 | if (hist_size) |
| 165 | history_truncate_file (hist_file, hist_size); |
| 166 | } |
| 167 | DPRINT0 ("(Child process died.)\n"); |
| 168 | tcsetattr(STDIN_FILENO, TCSANOW, &orig_term); |
| 169 | exit (0); |
| 170 | } |
| 171 | |
| 172 | volatile int propagate_sigwinch = 0; |
| 173 | |
| 174 | /* sigwinch_handler |
| 175 | * propagate window size changes from input file descriptor to |
| 176 | * master side of pty. |
| 177 | */ |
| 178 | void sigwinch_handler(int signal) { |
| 179 | propagate_sigwinch = 1; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | /* get_slave_pty() returns an integer file descriptor. |
| 184 | * If it returns < 0, an error has occurred. |
| 185 | * Otherwise, it has returned the slave file descriptor. |
| 186 | */ |
| 187 | |
| 188 | int get_slave_pty(char *name) { |
| 189 | struct group *gptr; |
| 190 | gid_t gid; |
| 191 | int slave = -1; |
| 192 | |
| 193 | /* chown/chmod the corresponding pty, if possible. |
| 194 | * This will only work if the process has root permissions. |
| 195 | * Alternatively, write and exec a small setuid program that |
| 196 | * does just this. |
| 197 | */ |
| 198 | if ((gptr = getgrnam("tty")) != 0) { |
| 199 | gid = gptr->gr_gid; |
| 200 | } else { |
| 201 | /* if the tty group does not exist, don't change the |
| 202 | * group on the slave pty, only the owner |
| 203 | */ |
| 204 | gid = -1; |
| 205 | } |
| 206 | |
| 207 | /* Note that we do not check for errors here. If this is code |
| 208 | * where these actions are critical, check for errors! |
| 209 | */ |
| 210 | chown(name, getuid(), gid); |
| 211 | /* This code only makes the slave read/writeable for the user. |
| 212 | * If this is for an interactive shell that will want to |
| 213 | * receive "write" and "wall" messages, OR S_IWGRP into the |
| 214 | * second argument below. |
| 215 | */ |
| 216 | chmod(name, S_IRUSR|S_IWUSR); |
| 217 | |
| 218 | /* open the corresponding slave pty */ |
| 219 | slave = open(name, O_RDWR); |
| 220 | return (slave); |
| 221 | } |
| 222 | |
| 223 | /* Certain special characters, such as ctrl/C, we want to pass directly |
| 224 | to the inferior, rather than letting readline handle them. */ |
| 225 | |
| 226 | static char special_chars[20]; |
| 227 | static int special_chars_count; |
| 228 | |
| 229 | static void |
| 230 | add_special_char(int ch) |
| 231 | { |
| 232 | if (ch != 0) |
| 233 | special_chars[special_chars_count++] = ch; |
| 234 | } |
| 235 | |
| 236 | static int eof_char; |
| 237 | |
| 238 | static int |
| 239 | is_special_char(int ch) |
| 240 | { |
| 241 | int i; |
| 242 | #if 0 |
| 243 | if (ch == eof_char && rl_point == rl_end) |
| 244 | return 1; |
| 245 | #endif |
| 246 | for (i = special_chars_count; --i >= 0; ) |
| 247 | if (special_chars[i] == ch) |
| 248 | return 1; |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static char buf[1024]; |
| 253 | /* buf[0 .. buf_count-1] is the what has been emitted on the current line. |
| 254 | It is used as the readline prompt. */ |
| 255 | static int buf_count = 0; |
| 256 | |
| 257 | int do_emphasize_input = 1; |
| 258 | int current_emphasize_input; |
| 259 | |
| 260 | char *start_input_mode = "\033[1m"; |
| 261 | char *end_input_mode = "\033[0m"; |
| 262 | |
| 263 | int num_keys = 0; |
| 264 | |
| 265 | static void maybe_emphasize_input (int on) |
| 266 | { |
| 267 | if (on == current_emphasize_input |
| 268 | || (on && ! do_emphasize_input)) |
| 269 | return; |
| 270 | fprintf (rl_outstream, on ? start_input_mode : end_input_mode); |
| 271 | fflush (rl_outstream); |
| 272 | current_emphasize_input = on; |
| 273 | } |
| 274 | |
| 275 | static void |
| 276 | null_prep_terminal (int meta) |
| 277 | { |
| 278 | } |
| 279 | |
| 280 | static void |
| 281 | null_deprep_terminal () |
| 282 | { |
| 283 | maybe_emphasize_input (0); |
| 284 | } |
| 285 | |
| 286 | static int |
| 287 | pre_input_change_mode (void) |
| 288 | { |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | char pending_special_char; |
| 293 | |
| 294 | static void |
| 295 | line_handler (char *line) |
| 296 | { |
| 297 | if (line == NULL) |
| 298 | { |
| 299 | char buf[1]; |
| 300 | DPRINT0("saw eof!\n"); |
| 301 | buf[0] = '\004'; /* ctrl/d */ |
| 302 | write (out_to_inferior_fd, buf, 1); |
| 303 | } |
| 304 | else |
| 305 | { |
| 306 | static char enter[] = "\r"; |
| 307 | /* Send line to inferior: */ |
| 308 | int length = strlen (line); |
| 309 | if (length > ECHO_SUPPRESS_MAX-2) |
| 310 | { |
| 311 | echo_suppress_start = 0; |
| 312 | echo_suppress_limit = 0; |
| 313 | } |
| 314 | else |
| 315 | { |
| 316 | if (echo_suppress_limit + length > ECHO_SUPPRESS_MAX - 2) |
| 317 | { |
| 318 | if (echo_suppress_limit - echo_suppress_start + length |
| 319 | <= ECHO_SUPPRESS_MAX - 2) |
| 320 | { |
| 321 | memmove (echo_suppress_buffer, |
| 322 | echo_suppress_buffer + echo_suppress_start, |
| 323 | echo_suppress_limit - echo_suppress_start); |
| 324 | echo_suppress_limit -= echo_suppress_start; |
| 325 | echo_suppress_start = 0; |
| 326 | } |
| 327 | else |
| 328 | { |
| 329 | echo_suppress_limit = 0; |
| 330 | } |
| 331 | echo_suppress_start = 0; |
| 332 | } |
| 333 | memcpy (echo_suppress_buffer + echo_suppress_limit, |
| 334 | line, length); |
| 335 | echo_suppress_limit += length; |
| 336 | echo_suppress_buffer[echo_suppress_limit++] = '\r'; |
| 337 | echo_suppress_buffer[echo_suppress_limit++] = '\n'; |
| 338 | } |
| 339 | write (out_to_inferior_fd, line, length); |
| 340 | if (pending_special_char == 0) |
| 341 | { |
| 342 | write (out_to_inferior_fd, enter, sizeof(enter)-1); |
| 343 | if (*line) |
| 344 | add_history (line); |
| 345 | } |
| 346 | free (line); |
| 347 | } |
| 348 | rl_callback_handler_remove (); |
| 349 | buf_count = 0; |
| 350 | num_keys = 0; |
| 351 | if (pending_special_char != 0) |
| 352 | { |
| 353 | write (out_to_inferior_fd, &pending_special_char, 1); |
| 354 | pending_special_char = 0; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | /* Value of rl_getc_function. |
| 359 | Use this because readline should read from stdin, not rl_instream, |
| 360 | points to the pty (so readline has monitor its terminal modes). */ |
| 361 | |
| 362 | int |
| 363 | my_rl_getc (FILE *dummy) |
| 364 | { |
| 365 | int ch = rl_getc (stdin); |
| 366 | if (is_special_char (ch)) |
| 367 | { |
| 368 | pending_special_char = ch; |
| 369 | return '\r'; |
| 370 | } |
| 371 | return ch; |
| 372 | } |
| 373 | |
| 374 | int |
| 375 | main(int argc, char** argv) |
| 376 | { |
| 377 | char *path; |
| 378 | int i; |
| 379 | int master; |
| 380 | char *name; |
| 381 | int in_from_tty_fd; |
| 382 | struct sigaction act; |
| 383 | struct winsize ws; |
| 384 | struct termios t; |
| 385 | int maxfd; |
| 386 | fd_set in_set; |
| 387 | static char empty_string[1] = ""; |
| 388 | char *prompt = empty_string; |
| 389 | int ioctl_err = 0; |
| 390 | int arg_base = 1; |
| 391 | |
| 392 | #ifdef DEBUG |
| 393 | logfile = fopen("/tmp/rlfe.log", "w"); |
| 394 | #endif |
| 395 | |
| 396 | while (arg_base<argc) |
| 397 | { |
| 398 | if (argv[arg_base][0] != '-') |
| 399 | break; |
| 400 | if (arg_base+1 >= argc ) |
| 401 | usage_exit(); |
| 402 | switch(argv[arg_base][1]) |
| 403 | { |
| 404 | case 'h': |
| 405 | arg_base++; |
| 406 | hist_file = argv[arg_base]; |
| 407 | break; |
| 408 | case 's': |
| 409 | arg_base++; |
| 410 | hist_size = atoi(argv[arg_base]); |
| 411 | if (hist_size<0) |
| 412 | usage_exit(); |
| 413 | break; |
| 414 | default: |
| 415 | usage_exit(); |
| 416 | } |
| 417 | arg_base++; |
| 418 | } |
| 419 | if (hist_file) |
| 420 | read_history (hist_file); |
| 421 | |
| 422 | set_edit_mode (); |
| 423 | |
| 424 | rl_readline_name = APPLICATION_NAME; |
| 425 | |
| 426 | if ((master = OpenPTY (&name)) < 0) |
| 427 | { |
| 428 | perror("ptypair: could not open master pty"); |
| 429 | exit(1); |
| 430 | } |
| 431 | |
| 432 | DPRINT1("pty name: '%s'\n", name); |
| 433 | |
| 434 | /* set up SIGWINCH handler */ |
| 435 | act.sa_handler = sigwinch_handler; |
| 436 | sigemptyset(&(act.sa_mask)); |
| 437 | act.sa_flags = 0; |
| 438 | if (sigaction(SIGWINCH, &act, NULL) < 0) |
| 439 | { |
| 440 | perror("ptypair: could not handle SIGWINCH "); |
| 441 | exit(1); |
| 442 | } |
| 443 | |
| 444 | if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) |
| 445 | { |
| 446 | perror("ptypair: could not get window size"); |
| 447 | exit(1); |
| 448 | } |
| 449 | |
| 450 | if ((child = fork()) < 0) |
| 451 | { |
| 452 | perror("cannot fork"); |
| 453 | exit(1); |
| 454 | } |
| 455 | |
| 456 | if (child == 0) |
| 457 | { |
| 458 | int slave; /* file descriptor for slave pty */ |
| 459 | |
| 460 | /* We are in the child process */ |
| 461 | close(master); |
| 462 | |
| 463 | #ifdef TIOCSCTTY |
| 464 | if ((slave = get_slave_pty(name)) < 0) |
| 465 | { |
| 466 | perror("ptypair: could not open slave pty"); |
| 467 | exit(1); |
| 468 | } |
| 469 | #endif |
| 470 | |
| 471 | /* We need to make this process a session group leader, because |
| 472 | * it is on a new PTY, and things like job control simply will |
| 473 | * not work correctly unless there is a session group leader |
| 474 | * and process group leader (which a session group leader |
| 475 | * automatically is). This also disassociates us from our old |
| 476 | * controlling tty. |
| 477 | */ |
| 478 | if (setsid() < 0) |
| 479 | { |
| 480 | perror("could not set session leader"); |
| 481 | } |
| 482 | |
| 483 | /* Tie us to our new controlling tty. */ |
| 484 | #ifdef TIOCSCTTY |
| 485 | if (ioctl(slave, TIOCSCTTY, NULL)) |
| 486 | { |
| 487 | perror("could not set new controlling tty"); |
| 488 | } |
| 489 | #else |
| 490 | if ((slave = get_slave_pty(name)) < 0) |
| 491 | { |
| 492 | perror("ptypair: could not open slave pty"); |
| 493 | exit(1); |
| 494 | } |
| 495 | #endif |
| 496 | |
| 497 | /* make slave pty be standard in, out, and error */ |
| 498 | dup2(slave, STDIN_FILENO); |
| 499 | dup2(slave, STDOUT_FILENO); |
| 500 | dup2(slave, STDERR_FILENO); |
| 501 | |
| 502 | /* at this point the slave pty should be standard input */ |
| 503 | if (slave > 2) |
| 504 | { |
| 505 | close(slave); |
| 506 | } |
| 507 | |
| 508 | /* Try to restore window size; failure isn't critical */ |
| 509 | if (ioctl(STDOUT_FILENO, TIOCSWINSZ, &ws) < 0) |
| 510 | { |
| 511 | perror("could not restore window size"); |
| 512 | } |
| 513 | |
| 514 | /* now start the shell */ |
| 515 | { |
| 516 | static char* command_args[] = { COMMAND_ARGS, NULL }; |
| 517 | static char* alt_command_args[] = { ALT_COMMAND_ARGS, NULL }; |
| 518 | if (argc <= 1) |
| 519 | { |
| 520 | execvp (COMMAND, command_args); |
| 521 | execvp (ALT_COMMAND, alt_command_args); |
| 522 | } |
| 523 | else |
| 524 | execvp (argv[arg_base], &argv[arg_base]); |
| 525 | } |
| 526 | |
| 527 | /* should never be reached */ |
| 528 | exit(1); |
| 529 | } |
| 530 | |
| 531 | /* parent */ |
| 532 | signal (SIGCHLD, sig_child); |
| 533 | |
| 534 | /* Note that we only set termios settings for standard input; |
| 535 | * the master side of a pty is NOT a tty. |
| 536 | */ |
| 537 | tcgetattr(STDIN_FILENO, &orig_term); |
| 538 | |
| 539 | t = orig_term; |
| 540 | eof_char = t.c_cc[VEOF]; |
| 541 | /* add_special_char(t.c_cc[VEOF]);*/ |
| 542 | add_special_char(t.c_cc[VINTR]); |
| 543 | add_special_char(t.c_cc[VQUIT]); |
| 544 | add_special_char(t.c_cc[VSUSP]); |
| 545 | #if defined (VDISCARD) |
| 546 | add_special_char(t.c_cc[VDISCARD]); |
| 547 | #endif |
| 548 | |
| 549 | t.c_lflag &= ~(ICANON | ISIG | ECHO | ECHOCTL | ECHOE | \ |
| 550 | ECHOK | ECHONL |
| 551 | #if defined (ECHOKE) |
| 552 | | ECHOKE |
| 553 | #endif |
| 554 | #if defined (ECHOPRT) |
| 555 | | ECHOPRT |
| 556 | #endif |
| 557 | ); |
| 558 | t.c_iflag &= ~ICRNL; |
| 559 | t.c_iflag |= IGNBRK; |
| 560 | t.c_cc[VMIN] = 1; |
| 561 | t.c_cc[VTIME] = 0; |
| 562 | tcsetattr(STDIN_FILENO, TCSANOW, &t); |
| 563 | in_from_inferior_fd = master; |
| 564 | out_to_inferior_fd = master; |
| 565 | rl_instream = fdopen (master, "r"); |
| 566 | rl_getc_function = my_rl_getc; |
| 567 | |
| 568 | rl_prep_term_function = null_prep_terminal; |
| 569 | rl_deprep_term_function = null_deprep_terminal; |
| 570 | rl_pre_input_hook = pre_input_change_mode; |
| 571 | rl_callback_handler_install (prompt, line_handler); |
| 572 | |
| 573 | in_from_tty_fd = STDIN_FILENO; |
| 574 | FD_ZERO (&in_set); |
| 575 | maxfd = in_from_inferior_fd > in_from_tty_fd ? in_from_inferior_fd |
| 576 | : in_from_tty_fd; |
| 577 | for (;;) |
| 578 | { |
| 579 | int num; |
| 580 | FD_SET (in_from_inferior_fd, &in_set); |
| 581 | FD_SET (in_from_tty_fd, &in_set); |
| 582 | |
| 583 | num = select(maxfd+1, &in_set, NULL, NULL, NULL); |
| 584 | |
| 585 | if (propagate_sigwinch) |
| 586 | { |
| 587 | struct winsize ws; |
| 588 | if (ioctl (STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) |
| 589 | { |
| 590 | ioctl (master, TIOCSWINSZ, &ws); |
| 591 | } |
| 592 | propagate_sigwinch = 0; |
| 593 | continue; |
| 594 | } |
| 595 | |
| 596 | if (num <= 0) |
| 597 | { |
| 598 | perror ("select"); |
| 599 | exit (-1); |
| 600 | } |
| 601 | if (FD_ISSET (in_from_tty_fd, &in_set)) |
| 602 | { |
| 603 | extern int _rl_echoing_p; |
| 604 | struct termios term_master; |
| 605 | int do_canon = 1; |
| 606 | int do_icrnl = 1; |
| 607 | int ioctl_ret; |
| 608 | |
| 609 | DPRINT1("[tty avail num_keys:%d]\n", num_keys); |
| 610 | |
| 611 | /* If we can't get tty modes for the master side of the pty, we |
| 612 | can't handle non-canonical-mode programs. Always assume the |
| 613 | master is in canonical echo mode if we can't tell. */ |
| 614 | ioctl_ret = tcgetattr(master, &term_master); |
| 615 | |
| 616 | if (ioctl_ret >= 0) |
| 617 | { |
| 618 | do_canon = (term_master.c_lflag & ICANON) != 0; |
| 619 | do_icrnl = (term_master.c_lflag & ICRNL) != 0; |
| 620 | _rl_echoing_p = (term_master.c_lflag & ECHO) != 0; |
| 621 | DPRINT1 ("echo,canon,crnl:%03d\n", |
| 622 | 100 * _rl_echoing_p |
| 623 | + 10 * do_canon |
| 624 | + 1 * do_icrnl); |
| 625 | } |
| 626 | else |
| 627 | { |
| 628 | if (ioctl_err == 0) |
| 629 | DPRINT1("tcgetattr on master fd failed: errno = %d\n", errno); |
| 630 | ioctl_err = 1; |
| 631 | } |
| 632 | |
| 633 | if (do_canon == 0 && num_keys == 0) |
| 634 | { |
| 635 | char ch[10]; |
| 636 | int count = read (STDIN_FILENO, ch, sizeof(ch)); |
| 637 | DPRINT1("[read %d chars from stdin: ", count); |
| 638 | DPRINT2(" \"%.*s\"]\n", count, ch); |
| 639 | if (do_icrnl) |
| 640 | { |
| 641 | int i = count; |
| 642 | while (--i >= 0) |
| 643 | { |
| 644 | if (ch[i] == '\r') |
| 645 | ch[i] = '\n'; |
| 646 | } |
| 647 | } |
| 648 | maybe_emphasize_input (1); |
| 649 | write (out_to_inferior_fd, ch, count); |
| 650 | } |
| 651 | else |
| 652 | { |
| 653 | if (num_keys == 0) |
| 654 | { |
| 655 | int i; |
| 656 | /* Re-install callback handler for new prompt. */ |
| 657 | if (prompt != empty_string) |
| 658 | free (prompt); |
| 659 | if (prompt == NULL) |
| 660 | { |
| 661 | DPRINT0("New empty prompt\n"); |
| 662 | prompt = empty_string; |
| 663 | } |
| 664 | else |
| 665 | { |
| 666 | if (do_emphasize_input && buf_count > 0) |
| 667 | { |
| 668 | prompt = malloc (buf_count + strlen (end_input_mode) |
| 669 | + strlen (start_input_mode) + 5); |
| 670 | sprintf (prompt, "\001%s\002%.*s\001%s\002", |
| 671 | end_input_mode, |
| 672 | buf_count, buf, |
| 673 | start_input_mode); |
| 674 | } |
| 675 | else |
| 676 | { |
| 677 | prompt = malloc (buf_count + 1); |
| 678 | memcpy (prompt, buf, buf_count); |
| 679 | prompt[buf_count] = '\0'; |
| 680 | } |
| 681 | DPRINT1("New prompt '%s'\n", prompt); |
| 682 | #if 0 /* ifdef HAVE_RL_ALREADY_PROMPTED */ |
| 683 | /* Doesn't quite work when do_emphasize_input is 1. */ |
| 684 | rl_already_prompted = buf_count > 0; |
| 685 | #else |
| 686 | if (buf_count > 0) |
| 687 | write (1, "\r", 1); |
| 688 | #endif |
| 689 | } |
| 690 | |
| 691 | rl_callback_handler_install (prompt, line_handler); |
| 692 | } |
| 693 | num_keys++; |
| 694 | maybe_emphasize_input (1); |
| 695 | rl_callback_read_char (); |
| 696 | } |
| 697 | } |
| 698 | else /* output from inferior. */ |
| 699 | { |
| 700 | int i; |
| 701 | int count; |
| 702 | int old_count; |
| 703 | if (buf_count > (sizeof(buf) >> 2)) |
| 704 | buf_count = 0; |
| 705 | count = read (in_from_inferior_fd, buf+buf_count, |
| 706 | sizeof(buf) - buf_count); |
| 707 | DPRINT2("read %d from inferior, buf_count=%d", count, buf_count); |
| 708 | DPRINT2(": \"%.*s\"", count, buf+buf_count); |
| 709 | maybe_emphasize_input (0); |
| 710 | if (count <= 0) |
| 711 | { |
| 712 | DPRINT0 ("(Connection closed by foreign host.)\n"); |
| 713 | tcsetattr(STDIN_FILENO, TCSANOW, &orig_term); |
| 714 | exit (0); |
| 715 | } |
| 716 | old_count = buf_count; |
| 717 | |
| 718 | /* Look for any pending echo that we need to suppress. */ |
| 719 | while (echo_suppress_start < echo_suppress_limit |
| 720 | && count > 0 |
| 721 | && buf[buf_count] == echo_suppress_buffer[echo_suppress_start]) |
| 722 | { |
| 723 | count--; |
| 724 | buf_count++; |
| 725 | echo_suppress_start++; |
| 726 | } |
| 727 | DPRINT1("suppressed %d characters of echo.\n", buf_count-old_count); |
| 728 | |
| 729 | /* Write to the terminal anything that was not suppressed. */ |
| 730 | if (count > 0) |
| 731 | write (1, buf + buf_count, count); |
| 732 | |
| 733 | /* Finally, look for a prompt candidate. |
| 734 | * When we get around to going input (from the keyboard), |
| 735 | * we will consider the prompt to be anything since the last |
| 736 | * line terminator. So we need to save that text in the |
| 737 | * initial part of buf. However, anything before the |
| 738 | * most recent end-of-line is not interesting. */ |
| 739 | buf_count += count; |
| 740 | #if 1 |
| 741 | for (i = buf_count; --i >= old_count; ) |
| 742 | #else |
| 743 | for (i = buf_count - 1; i-- >= buf_count - count; ) |
| 744 | #endif |
| 745 | { |
| 746 | if (buf[i] == '\n' || buf[i] == '\r') |
| 747 | { |
| 748 | i++; |
| 749 | memmove (buf, buf+i, buf_count - i); |
| 750 | buf_count -= i; |
| 751 | break; |
| 752 | } |
| 753 | } |
| 754 | DPRINT2("-> i: %d, buf_count: %d\n", i, buf_count); |
| 755 | } |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | static void set_edit_mode () |
| 760 | { |
| 761 | int vi = 0; |
| 762 | char *shellopts; |
| 763 | |
| 764 | shellopts = getenv ("SHELLOPTS"); |
| 765 | while (shellopts != 0) |
| 766 | { |
| 767 | if (strncmp ("vi", shellopts, 2) == 0) |
| 768 | { |
| 769 | vi = 1; |
| 770 | break; |
| 771 | } |
| 772 | shellopts = strchr (shellopts + 1, ':'); |
| 773 | } |
| 774 | |
| 775 | if (!vi) |
| 776 | { |
| 777 | if (getenv ("EDITOR") != 0) |
| 778 | vi |= strcmp (getenv ("EDITOR"), "vi") == 0; |
| 779 | } |
| 780 | |
| 781 | if (vi) |
| 782 | rl_variable_bind ("editing-mode", "vi"); |
| 783 | else |
| 784 | rl_variable_bind ("editing-mode", "emacs"); |
| 785 | } |
| 786 | |
| 787 | |
| 788 | static void usage_exit () |
| 789 | { |
| 790 | fprintf (stderr, "Usage: rlfe [-h histfile] [-s size] cmd [arg1] [arg2] ...\n\n"); |
| 791 | exit (1); |
| 792 | } |