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f9267e15 EZ |
1 | /* A front-end using readline to "cook" input lines for Kawa. |
2 | * | |
3 | * Copyright (C) 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 | ||
14 | /* PROBLEMS/TODO: | |
15 | * | |
16 | * Only tested under Linux; needs to be ported. | |
17 | * | |
18 | * When running mc -c under the Linux console, mc does not recognize | |
19 | * mouse clicks, which mc does when not running under fep. | |
20 | * | |
21 | * Pasting selected text containing tabs is like hitting the tab character, | |
22 | * which invokes readline completion. We don't want this. I don't know | |
23 | * if this is fixable without integrating fep into a terminal emulator. | |
24 | * | |
25 | * Echo suppression is a kludge, but can only be avoided with better kernel | |
26 | * support: We need a tty mode to disable "real" echoing, while still | |
27 | * letting the inferior think its tty driver to doing echoing. | |
28 | * Stevens's book claims SCR$ and BSD4.3+ have TIOCREMOTE. | |
29 | * | |
30 | * The latest readline may have some hooks we can use to avoid having | |
31 | * to back up the prompt. | |
32 | * | |
33 | * Desirable readline feature: When in cooked no-echo mode (e.g. password), | |
34 | * echo characters are they are types with '*', but remove them when done. | |
35 | * | |
36 | * A synchronous output while we're editing an input line should be | |
37 | * inserted in the output view *before* the input line, so that the | |
38 | * lines being edited (with the prompt) float at the end of the input. | |
39 | * | |
40 | * A "page mode" option to emulate more/less behavior: At each page of | |
41 | * output, pause for a user command. This required parsing the output | |
42 | * to keep track of line lengths. It also requires remembering the | |
43 | * output, if we want an option to scroll back, which suggests that | |
44 | * this should be integrated with a terminal emulator like xterm. | |
45 | */ | |
46 | ||
47 | #ifdef HAVE_CONFIG_H | |
48 | # include <config.h> | |
49 | #endif | |
50 | ||
51 | #include <stdio.h> | |
52 | #include <fcntl.h> | |
53 | #include <sys/types.h> | |
54 | #include <sys/socket.h> | |
55 | #include <netinet/in.h> | |
56 | #include <arpa/inet.h> | |
57 | #include <signal.h> | |
58 | #include <netdb.h> | |
59 | #include <stdlib.h> | |
60 | #include <errno.h> | |
61 | #include <grp.h> | |
62 | #include <string.h> | |
63 | #include <sys/stat.h> | |
64 | #include <unistd.h> | |
65 | #include <sys/ioctl.h> | |
66 | #include <termios.h> | |
67 | ||
68 | #ifdef READLINE_LIBRARY | |
69 | # include "readline.h" | |
70 | # include "history.h" | |
71 | #else | |
72 | # include <readline/readline.h> | |
73 | # include <readline/history.h> | |
74 | #endif | |
75 | ||
76 | #ifndef COMMAND | |
77 | #define COMMAND "/bin/sh" | |
78 | #endif | |
79 | #ifndef COMMAND_ARGS | |
80 | #define COMMAND_ARGS COMMAND | |
81 | #endif | |
82 | ||
83 | #ifndef HAVE_MEMMOVE | |
84 | # if __GNUC__ > 1 | |
85 | # define memmove(d, s, n) __builtin_memcpy(d, s, n) | |
86 | # else | |
87 | # define memmove(d, s, n) memcpy(d, s, n) | |
88 | # endif | |
89 | #else | |
90 | # define memmove(d, s, n) memcpy(d, s, n) | |
91 | #endif | |
92 | ||
2ba146cd | 93 | #define APPLICATION_NAME "Fep" |
f9267e15 EZ |
94 | |
95 | static int in_from_inferior_fd; | |
96 | static int out_to_inferior_fd; | |
97 | ||
98 | /* Unfortunately, we cannot safely display echo from the inferior process. | |
99 | The reason is that the echo bit in the pty is "owned" by the inferior, | |
100 | and if we try to turn it off, we could confuse the inferior. | |
101 | Thus, when echoing, we get echo twice: First readline echoes while | |
102 | we're actually editing. Then we send the line to the inferior, and the | |
103 | terminal driver send back an extra echo. | |
104 | The work-around is to remember the input lines, and when we see that | |
105 | line come back, we supress the output. | |
106 | A better solution (supposedly available on SVR4) would be a smarter | |
107 | terminal driver, with more flags ... */ | |
108 | #define ECHO_SUPPRESS_MAX 1024 | |
109 | char echo_suppress_buffer[ECHO_SUPPRESS_MAX]; | |
110 | int echo_suppress_start = 0; | |
111 | int echo_suppress_limit = 0; | |
112 | ||
2ba146cd | 113 | #define DEBUG |
f9267e15 EZ |
114 | |
115 | #ifdef DEBUG | |
2ba146cd AC |
116 | FILE *logfile = NULL; |
117 | #define DPRINT0(FMT) (fprintf(logfile, FMT), fflush(logfile)) | |
118 | #define DPRINT1(FMT, V1) (fprintf(logfile, FMT, V1), fflush(logfile)) | |
119 | #define DPRINT2(FMT, V1, V2) (fprintf(logfile, FMT, V1, V2), fflush(logfile)) | |
f9267e15 EZ |
120 | #else |
121 | #define DPRINT0(FMT) /* Do nothing */ | |
122 | #define DPRINT1(FMT, V1) /* Do nothing */ | |
123 | #define DPRINT2(FMT, V1, V2) /* Do nothing */ | |
124 | #endif | |
125 | ||
126 | struct termios orig_term; | |
127 | ||
128 | /* Pid of child process. */ | |
129 | static pid_t child = -1; | |
130 | ||
131 | static void | |
132 | sig_child (int signo) | |
133 | { | |
134 | int status; | |
135 | wait (&status); | |
136 | DPRINT0 ("(Child process died.)\n"); | |
137 | tcsetattr(STDIN_FILENO, TCSANOW, &orig_term); | |
138 | exit (0); | |
139 | } | |
140 | ||
141 | volatile int propagate_sigwinch = 0; | |
142 | ||
143 | /* sigwinch_handler | |
144 | * propagate window size changes from input file descriptor to | |
145 | * master side of pty. | |
146 | */ | |
147 | void sigwinch_handler(int signal) { | |
148 | propagate_sigwinch = 1; | |
149 | } | |
150 | ||
151 | /* get_master_pty() takes a double-indirect character pointer in which | |
152 | * to put a slave name, and returns an integer file descriptor. | |
153 | * If it returns < 0, an error has occurred. | |
154 | * Otherwise, it has returned the master pty file descriptor, and fills | |
155 | * in *name with the name of the corresponding slave pty. | |
156 | * Once the slave pty has been opened, you are responsible to free *name. | |
157 | */ | |
158 | ||
159 | int get_master_pty(char **name) { | |
160 | int i, j; | |
161 | /* default to returning error */ | |
162 | int master = -1; | |
163 | ||
164 | /* create a dummy name to fill in */ | |
165 | *name = strdup("/dev/ptyXX"); | |
166 | ||
167 | /* search for an unused pty */ | |
168 | for (i=0; i<16 && master <= 0; i++) { | |
169 | for (j=0; j<16 && master <= 0; j++) { | |
170 | (*name)[5] = 'p'; | |
171 | (*name)[8] = "pqrstuvwxyzPQRST"[i]; | |
172 | (*name)[9] = "0123456789abcdef"[j]; | |
173 | /* open the master pty */ | |
174 | if ((master = open(*name, O_RDWR)) < 0) { | |
175 | if (errno == ENOENT) { | |
176 | /* we are out of pty devices */ | |
177 | free (*name); | |
178 | return (master); | |
179 | } | |
180 | } | |
181 | else { | |
182 | /* By substituting a letter, we change the master pty | |
183 | * name into the slave pty name. | |
184 | */ | |
185 | (*name)[5] = 't'; | |
186 | if (access(*name, R_OK|W_OK) != 0) | |
187 | { | |
188 | close(master); | |
189 | master = -1; | |
190 | } | |
191 | } | |
192 | } | |
193 | } | |
194 | if ((master < 0) && (i == 16) && (j == 16)) { | |
195 | /* must have tried every pty unsuccessfully */ | |
196 | free (*name); | |
197 | return (master); | |
198 | } | |
199 | ||
200 | (*name)[5] = 't'; | |
201 | ||
202 | return (master); | |
203 | } | |
204 | ||
205 | /* get_slave_pty() returns an integer file descriptor. | |
206 | * If it returns < 0, an error has occurred. | |
207 | * Otherwise, it has returned the slave file descriptor. | |
208 | */ | |
209 | ||
210 | int get_slave_pty(char *name) { | |
211 | struct group *gptr; | |
212 | gid_t gid; | |
213 | int slave = -1; | |
214 | ||
215 | /* chown/chmod the corresponding pty, if possible. | |
216 | * This will only work if the process has root permissions. | |
217 | * Alternatively, write and exec a small setuid program that | |
218 | * does just this. | |
219 | */ | |
220 | if ((gptr = getgrnam("tty")) != 0) { | |
221 | gid = gptr->gr_gid; | |
222 | } else { | |
223 | /* if the tty group does not exist, don't change the | |
224 | * group on the slave pty, only the owner | |
225 | */ | |
226 | gid = -1; | |
227 | } | |
228 | ||
229 | /* Note that we do not check for errors here. If this is code | |
230 | * where these actions are critical, check for errors! | |
231 | */ | |
232 | chown(name, getuid(), gid); | |
233 | /* This code only makes the slave read/writeable for the user. | |
234 | * If this is for an interactive shell that will want to | |
235 | * receive "write" and "wall" messages, OR S_IWGRP into the | |
236 | * second argument below. | |
237 | */ | |
238 | chmod(name, S_IRUSR|S_IWUSR); | |
239 | ||
240 | /* open the corresponding slave pty */ | |
241 | slave = open(name, O_RDWR); | |
242 | return (slave); | |
243 | } | |
244 | ||
245 | /* Certain special characters, such as ctrl/C, we want to pass directly | |
246 | to the inferior, rather than letting readline handle them. */ | |
247 | ||
248 | static char special_chars[20]; | |
249 | static int special_chars_count; | |
250 | ||
251 | static void | |
252 | add_special_char(int ch) | |
253 | { | |
254 | if (ch != 0) | |
255 | special_chars[special_chars_count++] = ch; | |
256 | } | |
257 | ||
258 | static int eof_char; | |
259 | ||
260 | static int | |
261 | is_special_char(int ch) | |
262 | { | |
263 | int i; | |
264 | #if 0 | |
265 | if (ch == eof_char && rl_point == rl_end) | |
266 | return 1; | |
267 | #endif | |
268 | for (i = special_chars_count; --i >= 0; ) | |
269 | if (special_chars[i] == ch) | |
270 | return 1; | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static char buf[1024]; | |
275 | /* buf[0 .. buf_count-1] is the what has been emitted on the current line. | |
276 | It is used as the readline prompt. */ | |
277 | static int buf_count = 0; | |
278 | ||
279 | int num_keys = 0; | |
280 | ||
281 | static void | |
282 | null_prep_terminal (int meta) | |
283 | { | |
284 | } | |
285 | ||
286 | static void | |
287 | null_deprep_terminal () | |
288 | { | |
289 | } | |
290 | ||
291 | char pending_special_char; | |
292 | ||
293 | static void | |
294 | line_handler (char *line) | |
295 | { | |
296 | if (line == NULL) | |
297 | { | |
298 | char buf[1]; | |
299 | DPRINT0("saw eof!\n"); | |
300 | buf[0] = '\004'; /* ctrl/d */ | |
301 | write (out_to_inferior_fd, buf, 1); | |
302 | } | |
303 | else | |
304 | { | |
305 | static char enter[] = "\r"; | |
306 | /* Send line to inferior: */ | |
307 | int length = strlen (line); | |
308 | if (length > ECHO_SUPPRESS_MAX-2) | |
309 | { | |
310 | echo_suppress_start = 0; | |
311 | echo_suppress_limit = 0; | |
312 | } | |
313 | else | |
314 | { | |
315 | if (echo_suppress_limit + length > ECHO_SUPPRESS_MAX - 2) | |
316 | { | |
317 | if (echo_suppress_limit - echo_suppress_start + length | |
318 | <= ECHO_SUPPRESS_MAX - 2) | |
319 | { | |
320 | memmove (echo_suppress_buffer, | |
321 | echo_suppress_buffer + echo_suppress_start, | |
322 | echo_suppress_limit - echo_suppress_start); | |
323 | echo_suppress_limit -= echo_suppress_start; | |
324 | echo_suppress_start = 0; | |
325 | } | |
326 | else | |
327 | { | |
328 | echo_suppress_limit = 0; | |
329 | } | |
330 | echo_suppress_start = 0; | |
331 | } | |
332 | memcpy (echo_suppress_buffer + echo_suppress_limit, | |
333 | line, length); | |
334 | echo_suppress_limit += length; | |
335 | echo_suppress_buffer[echo_suppress_limit++] = '\r'; | |
336 | echo_suppress_buffer[echo_suppress_limit++] = '\n'; | |
337 | } | |
338 | write (out_to_inferior_fd, line, length); | |
339 | if (pending_special_char == 0) | |
340 | { | |
341 | write (out_to_inferior_fd, enter, sizeof(enter)-1); | |
342 | if (*line) | |
343 | add_history (line); | |
344 | } | |
345 | free (line); | |
346 | } | |
347 | rl_callback_handler_remove (); | |
348 | buf_count = 0; | |
349 | num_keys = 0; | |
350 | if (pending_special_char != 0) | |
351 | { | |
352 | write (out_to_inferior_fd, &pending_special_char, 1); | |
353 | pending_special_char = 0; | |
354 | } | |
355 | } | |
356 | ||
357 | /* Value of rl_getc_function. | |
358 | Use this because readline should read from stdin, not rl_instream, | |
359 | points to the pty (so readline has monitor its terminal modes). */ | |
360 | ||
361 | int | |
362 | my_rl_getc (FILE *dummy) | |
363 | { | |
364 | int ch = rl_getc (stdin); | |
365 | if (is_special_char (ch)) | |
366 | { | |
367 | pending_special_char = ch; | |
368 | return '\r'; | |
369 | } | |
370 | return ch; | |
371 | } | |
372 | ||
373 | int | |
374 | main(int argc, char** argv) | |
375 | { | |
376 | char *path; | |
2ba146cd | 377 | int i; |
f9267e15 | 378 | int master; |
2ba146cd | 379 | char *name; |
f9267e15 EZ |
380 | int in_from_tty_fd; |
381 | struct sigaction act; | |
382 | struct winsize ws; | |
383 | struct termios t; | |
384 | int maxfd; | |
385 | fd_set in_set; | |
386 | static char empty_string[1] = ""; | |
387 | char *prompt = empty_string; | |
388 | int ioctl_err = 0; | |
389 | ||
390 | #ifdef DEBUG | |
2ba146cd | 391 | logfile = fopen("LOG", "w"); |
f9267e15 EZ |
392 | #endif |
393 | ||
2ba146cd AC |
394 | rl_readline_name = APPLICATION_NAME; |
395 | ||
f9267e15 EZ |
396 | if ((master = get_master_pty(&name)) < 0) |
397 | { | |
398 | perror("ptypair: could not open master pty"); | |
399 | exit(1); | |
400 | } | |
401 | ||
402 | DPRINT1("pty name: '%s'\n", name); | |
403 | ||
404 | /* set up SIGWINCH handler */ | |
405 | act.sa_handler = sigwinch_handler; | |
406 | sigemptyset(&(act.sa_mask)); | |
407 | act.sa_flags = 0; | |
408 | if (sigaction(SIGWINCH, &act, NULL) < 0) | |
409 | { | |
410 | perror("ptypair: could not handle SIGWINCH "); | |
411 | exit(1); | |
412 | } | |
413 | ||
414 | if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0) | |
415 | { | |
416 | perror("ptypair: could not get window size"); | |
417 | exit(1); | |
418 | } | |
419 | ||
420 | if ((child = fork()) < 0) | |
421 | { | |
422 | perror("cannot fork"); | |
423 | exit(1); | |
424 | } | |
425 | ||
426 | if (child == 0) | |
427 | { | |
428 | int slave; /* file descriptor for slave pty */ | |
429 | ||
430 | /* We are in the child process */ | |
431 | close(master); | |
432 | ||
433 | #ifdef TIOCSCTTY | |
434 | if ((slave = get_slave_pty(name)) < 0) | |
435 | { | |
436 | perror("ptypair: could not open slave pty"); | |
437 | exit(1); | |
438 | } | |
439 | free(name); | |
440 | #endif | |
441 | ||
442 | /* We need to make this process a session group leader, because | |
443 | * it is on a new PTY, and things like job control simply will | |
444 | * not work correctly unless there is a session group leader | |
445 | * and process group leader (which a session group leader | |
446 | * automatically is). This also disassociates us from our old | |
447 | * controlling tty. | |
448 | */ | |
449 | if (setsid() < 0) | |
450 | { | |
451 | perror("could not set session leader"); | |
452 | } | |
453 | ||
454 | /* Tie us to our new controlling tty. */ | |
455 | #ifdef TIOCSCTTY | |
456 | if (ioctl(slave, TIOCSCTTY, NULL)) | |
457 | { | |
458 | perror("could not set new controlling tty"); | |
459 | } | |
460 | #else | |
461 | if ((slave = get_slave_pty(name)) < 0) | |
462 | { | |
463 | perror("ptypair: could not open slave pty"); | |
464 | exit(1); | |
465 | } | |
466 | free(name); | |
467 | #endif | |
468 | ||
469 | /* make slave pty be standard in, out, and error */ | |
470 | dup2(slave, STDIN_FILENO); | |
471 | dup2(slave, STDOUT_FILENO); | |
472 | dup2(slave, STDERR_FILENO); | |
473 | ||
474 | /* at this point the slave pty should be standard input */ | |
475 | if (slave > 2) | |
476 | { | |
477 | close(slave); | |
478 | } | |
479 | ||
480 | /* Try to restore window size; failure isn't critical */ | |
481 | if (ioctl(STDOUT_FILENO, TIOCSWINSZ, &ws) < 0) | |
482 | { | |
483 | perror("could not restore window size"); | |
484 | } | |
485 | ||
486 | /* now start the shell */ | |
487 | { | |
488 | static char* command_args[] = { COMMAND_ARGS, NULL }; | |
2ba146cd | 489 | if (argc <= 1) |
f9267e15 EZ |
490 | execvp(COMMAND, command_args); |
491 | else | |
2ba146cd | 492 | execvp(argv[1], &argv[1]); |
f9267e15 EZ |
493 | } |
494 | ||
495 | /* should never be reached */ | |
496 | exit(1); | |
497 | } | |
498 | ||
499 | /* parent */ | |
500 | signal (SIGCHLD, sig_child); | |
501 | free(name); | |
502 | ||
503 | /* Note that we only set termios settings for standard input; | |
504 | * the master side of a pty is NOT a tty. | |
505 | */ | |
506 | tcgetattr(STDIN_FILENO, &orig_term); | |
507 | ||
508 | t = orig_term; | |
509 | eof_char = t.c_cc[VEOF]; | |
510 | /* add_special_char(t.c_cc[VEOF]);*/ | |
511 | add_special_char(t.c_cc[VINTR]); | |
512 | add_special_char(t.c_cc[VQUIT]); | |
513 | add_special_char(t.c_cc[VSUSP]); | |
514 | #if defined (VDISCARD) | |
515 | add_special_char(t.c_cc[VDISCARD]); | |
516 | #endif | |
517 | ||
518 | #if 0 | |
519 | t.c_lflag |= (ICANON | ISIG | ECHO | ECHOCTL | ECHOE | \ | |
520 | ECHOK | ECHOKE | ECHONL | ECHOPRT ); | |
521 | #else | |
522 | t.c_lflag &= ~(ICANON | ISIG | ECHO | ECHOCTL | ECHOE | \ | |
523 | ECHOK | ECHOKE | ECHONL | ECHOPRT ); | |
524 | #endif | |
525 | t.c_iflag |= IGNBRK; | |
526 | t.c_cc[VMIN] = 1; | |
527 | t.c_cc[VTIME] = 0; | |
528 | tcsetattr(STDIN_FILENO, TCSANOW, &t); | |
529 | in_from_inferior_fd = master; | |
530 | out_to_inferior_fd = master; | |
531 | rl_instream = fdopen (master, "r"); | |
532 | rl_getc_function = my_rl_getc; | |
533 | ||
534 | rl_prep_term_function = null_prep_terminal; | |
535 | rl_deprep_term_function = null_deprep_terminal; | |
536 | rl_callback_handler_install (prompt, line_handler); | |
537 | ||
538 | in_from_tty_fd = STDIN_FILENO; | |
539 | FD_ZERO (&in_set); | |
540 | maxfd = in_from_inferior_fd > in_from_tty_fd ? in_from_inferior_fd | |
541 | : in_from_tty_fd; | |
542 | for (;;) | |
543 | { | |
544 | int num; | |
545 | FD_SET (in_from_inferior_fd, &in_set); | |
546 | FD_SET (in_from_tty_fd, &in_set); | |
547 | ||
548 | num = select(maxfd+1, &in_set, NULL, NULL, NULL); | |
549 | ||
550 | if (propagate_sigwinch) | |
551 | { | |
552 | struct winsize ws; | |
553 | if (ioctl (STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) | |
554 | { | |
555 | ioctl (master, TIOCSWINSZ, &ws); | |
556 | } | |
557 | propagate_sigwinch = 0; | |
558 | continue; | |
559 | } | |
560 | ||
561 | if (num <= 0) | |
562 | { | |
563 | perror ("select"); | |
564 | exit (-1); | |
565 | } | |
566 | if (FD_ISSET (in_from_tty_fd, &in_set)) | |
567 | { | |
568 | extern int readline_echoing_p; | |
569 | struct termios term_master; | |
570 | int do_canon = 1; | |
571 | int ioctl_ret; | |
572 | ||
573 | DPRINT1("[tty avail num_keys:%d]\n", num_keys); | |
574 | ||
575 | /* If we can't get tty modes for the master side of the pty, we | |
576 | can't handle non-canonical-mode programs. Always assume the | |
577 | master is in canonical echo mode if we can't tell. */ | |
578 | ioctl_ret = tcgetattr(master, &term_master); | |
579 | ||
580 | if (ioctl_ret >= 0) | |
581 | { | |
582 | DPRINT2 ("echo:%d, canon:%d\n", | |
583 | (term_master.c_lflag & ECHO) != 0, | |
584 | (term_master.c_lflag & ICANON) != 0); | |
585 | do_canon = (term_master.c_lflag & ICANON) != 0; | |
586 | readline_echoing_p = (term_master.c_lflag & ECHO) != 0; | |
587 | } | |
588 | else | |
589 | { | |
590 | if (ioctl_err == 0) | |
591 | DPRINT1("tcgetattr on master fd failed: errno = %d\n", errno); | |
592 | ioctl_err = 1; | |
593 | } | |
594 | ||
595 | if (do_canon == 0 && num_keys == 0) | |
596 | { | |
597 | char ch[10]; | |
598 | int count = read (STDIN_FILENO, ch, sizeof(ch)); | |
599 | write (out_to_inferior_fd, ch, count); | |
600 | } | |
601 | else | |
602 | { | |
603 | if (num_keys == 0) | |
604 | { | |
605 | int i; | |
606 | /* Re-install callback handler for new prompt. */ | |
607 | if (prompt != empty_string) | |
608 | free (prompt); | |
609 | prompt = malloc (buf_count + 1); | |
610 | if (prompt == NULL) | |
611 | prompt = empty_string; | |
612 | else | |
613 | { | |
614 | memcpy (prompt, buf, buf_count); | |
615 | prompt[buf_count] = '\0'; | |
616 | DPRINT1("New prompt '%s'\n", prompt); | |
617 | #if 0 /* ifdef HAVE_RL_ALREADY_PROMPTED -- doesn't work */ | |
618 | rl_already_prompted = buf_count > 0; | |
619 | #else | |
620 | if (buf_count > 0) | |
621 | write (1, "\r", 1); | |
622 | #endif | |
623 | } | |
624 | rl_callback_handler_install (prompt, line_handler); | |
625 | } | |
626 | num_keys++; | |
627 | rl_callback_read_char (); | |
628 | } | |
629 | } | |
630 | else /* input from inferior. */ | |
631 | { | |
632 | int i; | |
633 | int count; | |
634 | int old_count; | |
635 | if (buf_count > (sizeof(buf) >> 2)) | |
636 | buf_count = 0; | |
637 | count = read (in_from_inferior_fd, buf+buf_count, | |
638 | sizeof(buf) - buf_count); | |
639 | if (count <= 0) | |
640 | { | |
641 | DPRINT0 ("(Connection closed by foreign host.)\n"); | |
642 | tcsetattr(STDIN_FILENO, TCSANOW, &orig_term); | |
643 | exit (0); | |
644 | } | |
645 | old_count = buf_count; | |
646 | ||
647 | /* Look for any pending echo that we need to suppress. */ | |
648 | while (echo_suppress_start < echo_suppress_limit | |
649 | && count > 0 | |
650 | && buf[buf_count] == echo_suppress_buffer[echo_suppress_start]) | |
651 | { | |
652 | count--; | |
653 | buf_count++; | |
654 | echo_suppress_start++; | |
655 | } | |
656 | ||
657 | /* Write to the terminal anything that was not suppressed. */ | |
658 | if (count > 0) | |
659 | write (1, buf + buf_count, count); | |
660 | ||
661 | /* Finally, look for a prompt candidate. | |
662 | * When we get around to going input (from the keyboard), | |
663 | * we will consider the prompt to be anything since the last | |
664 | * line terminator. So we need to save that text in the | |
665 | * initial part of buf. However, anything before the | |
666 | * most recent end-of-line is not interesting. */ | |
667 | buf_count += count; | |
668 | #if 1 | |
669 | for (i = buf_count; --i >= old_count; ) | |
670 | #else | |
671 | for (i = buf_count - 1; i-- >= buf_count - count; ) | |
672 | #endif | |
673 | { | |
674 | if (buf[i] == '\n' || buf[i] == '\r') | |
675 | { | |
676 | i++; | |
677 | memmove (buf, buf+i, buf_count - i); | |
678 | buf_count -= i; | |
679 | break; | |
680 | } | |
681 | } | |
682 | DPRINT2("-> i: %d, buf_count: %d\n", i, buf_count); | |
683 | } | |
684 | } | |
685 | } |