2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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36 static const char sccsid[] = "@(#)slc.c 8.2 (Berkeley) 5/30/95";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
48 static unsigned char *def_slcbuf = (unsigned char *)0;
49 static int def_slclen = 0;
50 static int slcchange; /* change to slc is requested */
51 static unsigned char *slcptr; /* pointer into slc buffer */
52 static unsigned char slcbuf[NSLC*6]; /* buffer for slc negotiation */
57 * Write out the current special characters to the client.
65 * Send out list of triplets of special characters
66 * to client. We only send info on the characters
67 * that are currently supported.
69 for (i = 1; i <= NSLC; i++) {
70 if ((slctab[i].defset.flag & SLC_LEVELBITS) == SLC_NOSUPPORT)
72 add_slc((unsigned char)i, slctab[i].current.flag,
73 slctab[i].current.val);
76 } /* end of send_slc */
81 * Set pty special characters to all the defaults.
88 for (i = 1; i <= NSLC; i++) {
89 slctab[i].current.val = slctab[i].defset.val;
90 if (slctab[i].current.val == (cc_t)(_POSIX_VDISABLE))
91 slctab[i].current.flag = SLC_NOSUPPORT;
93 slctab[i].current.flag = slctab[i].defset.flag;
95 *(slctab[i].sptr) = slctab[i].defset.val;
100 } /* end of default_slc */
101 #endif /* LINEMODE */
106 * Initialize the slc mapping table.
109 get_slc_defaults(void)
115 for (i = 1; i <= NSLC; i++) {
116 slctab[i].defset.flag =
117 spcset(i, &slctab[i].defset.val, &slctab[i].sptr);
118 slctab[i].current.flag = SLC_NOSUPPORT;
119 slctab[i].current.val = 0;
122 } /* end of get_slc_defaults */
128 * Add an slc triplet to the slc buffer.
131 add_slc(char func, char flag, cc_t val)
134 if ((*slcptr++ = (unsigned char)func) == 0xff)
137 if ((*slcptr++ = (unsigned char)flag) == 0xff)
140 if ((*slcptr++ = (unsigned char)val) == 0xff)
143 } /* end of add_slc */
148 * Get ready to process incoming slc's and respond to them.
150 * The parameter getit is non-zero if it is necessary to grab a copy
151 * of the terminal control structures.
160 (void) sprintf((char *)slcbuf, "%c%c%c%c",
161 IAC, SB, TELOPT_LINEMODE, LM_SLC);
164 } /* end of start_slc */
169 * Finish up the slc negotiation. If something to send, then send it.
172 end_slc(unsigned char **bufp)
177 * If a change has occured, store the new terminal control
178 * structures back to the terminal driver.
185 * If the pty state has not yet been fully processed and there is a
186 * deferred slc request from the client, then do not send any
187 * sort of slc negotiation now. We will respond to the client's
190 if (def_slcbuf && (terminit() == 0)) {
194 if (slcptr > (slcbuf + 4)) {
197 return(slcptr - slcbuf - 4);
199 (void) sprintf((char *)slcptr, "%c%c", IAC, SE);
201 len = slcptr - slcbuf;
202 output_datalen(slcbuf, len);
203 netflush(); /* force it out immediately */
204 DIAG(TD_OPTIONS, printsub('>', slcbuf+2, len-2););
209 } /* end of end_slc */
214 * Figure out what to do about the client's slc
217 process_slc(unsigned char func, unsigned char flag, cc_t val)
219 int hislevel, mylevel, ack;
222 * Ensure that we know something about this function
225 add_slc(func, SLC_NOSUPPORT, 0);
230 * Process the special case requests of 0 SLC_DEFAULT 0
231 * and 0 SLC_VARIABLE 0. Be a little forgiving here, don't
232 * worry about whether the value is actually 0 or not.
235 if ((flag = flag & SLC_LEVELBITS) == SLC_DEFAULT) {
238 } else if (flag == SLC_VARIABLE) {
245 * Appears to be a function that we know something about. So
246 * get on with it and see what we know.
249 hislevel = flag & SLC_LEVELBITS;
250 mylevel = slctab[func].current.flag & SLC_LEVELBITS;
251 ack = flag & SLC_ACK;
253 * ignore the command if:
254 * the function value and level are the same as what we already have;
255 * or the level is the same and the ack bit is set
257 if (hislevel == mylevel && (val == slctab[func].current.val || ack)) {
261 * If we get here, we got an ack, but the levels don't match.
262 * This shouldn't happen. If it does, it is probably because
263 * we have sent two requests to set a variable without getting
264 * a response between them, and this is the first response.
265 * So, ignore it, and wait for the next response.
269 change_slc(func, flag, val);
272 } /* end of process_slc */
277 * Process a request to change one of our special characters.
278 * Compare client's request with what we are capable of supporting.
281 change_slc(char func, char flag, cc_t val)
283 int hislevel, mylevel;
285 hislevel = flag & SLC_LEVELBITS;
286 mylevel = slctab[(int)func].defset.flag & SLC_LEVELBITS;
288 * If client is setting a function to NOSUPPORT
289 * or DEFAULT, then we can easily and directly
290 * accomodate the request.
292 if (hislevel == SLC_NOSUPPORT) {
293 slctab[(int)func].current.flag = flag;
294 slctab[(int)func].current.val = (cc_t)_POSIX_VDISABLE;
296 add_slc(func, flag, val);
299 if (hislevel == SLC_DEFAULT) {
301 * Special case here. If client tells us to use
302 * the default on a function we don't support, then
303 * return NOSUPPORT instead of what we may have as a
304 * default level of DEFAULT.
306 if (mylevel == SLC_DEFAULT) {
307 slctab[(int)func].current.flag = SLC_NOSUPPORT;
309 slctab[(int)func].current.flag = slctab[(int)func].defset.flag;
311 slctab[(int)func].current.val = slctab[(int)func].defset.val;
312 add_slc(func, slctab[(int)func].current.flag,
313 slctab[(int)func].current.val);
318 * Client wants us to change to a new value or he
319 * is telling us that he can't change to our value.
320 * Some of the slc's we support and can change,
321 * some we do support but can't change,
322 * and others we don't support at all.
323 * If we can change it then we have a pointer to
324 * the place to put the new value, so change it,
325 * otherwise, continue the negotiation.
327 if (slctab[(int)func].sptr) {
329 * We can change this one.
331 slctab[(int)func].current.val = val;
332 *(slctab[(int)func].sptr) = val;
333 slctab[(int)func].current.flag = flag;
336 add_slc(func, flag, val);
339 * It is not possible for us to support this
340 * request as he asks.
342 * If our level is DEFAULT, then just ack whatever was
345 * If he can't change and we can't change,
346 * then degenerate to NOSUPPORT.
348 * Otherwise we send our level back to him, (CANTCHANGE
349 * or NOSUPPORT) and if CANTCHANGE, send
352 if (mylevel == SLC_DEFAULT) {
353 slctab[(int)func].current.flag = flag;
354 slctab[(int)func].current.val = val;
356 } else if (hislevel == SLC_CANTCHANGE &&
357 mylevel == SLC_CANTCHANGE) {
358 flag &= ~SLC_LEVELBITS;
359 flag |= SLC_NOSUPPORT;
360 slctab[(int)func].current.flag = flag;
362 flag &= ~SLC_LEVELBITS;
364 slctab[(int)func].current.flag = flag;
365 if (mylevel == SLC_CANTCHANGE) {
366 slctab[(int)func].current.val =
367 slctab[(int)func].defset.val;
368 val = slctab[(int)func].current.val;
371 add_slc(func, flag, val);
374 } /* end of change_slc */
376 #if defined(USE_TERMIO) && (VEOF == VMIN)
377 cc_t oldeofc = '\004';
383 * Check the special characters in use and notify the client if any have
384 * changed. Only those characters that are capable of being changed are
385 * likely to have changed. If a local change occurs, kick the support level
386 * and flags up to the defaults.
393 for (i = 1; i <= NSLC; i++) {
394 #if defined(USE_TERMIO) && (VEOF == VMIN)
396 * In a perfect world this would be a neat little
397 * function. But in this world, we should not notify
398 * client of changes to the VEOF char when
399 * ICANON is off, because it is not representing
400 * a special character.
403 if (!tty_isediting())
405 else if (slctab[i].sptr)
406 oldeofc = *(slctab[i].sptr);
408 #endif /* defined(USE_TERMIO) && defined(SYSV_TERMIO) */
409 if (slctab[i].sptr &&
410 (*(slctab[i].sptr) != slctab[i].current.val)) {
411 slctab[i].current.val = *(slctab[i].sptr);
412 if (*(slctab[i].sptr) == (cc_t)_POSIX_VDISABLE)
413 slctab[i].current.flag = SLC_NOSUPPORT;
415 slctab[i].current.flag = slctab[i].defset.flag;
416 add_slc((unsigned char)i, slctab[i].current.flag,
417 slctab[i].current.val);
425 * Process an slc option buffer. Defer processing of incoming slc's
426 * until after the terminal state has been processed. Save the first slc
427 * request that comes along, but discard all others.
429 * ptr points to the beginning of the buffer, len is the length.
432 do_opt_slc(unsigned char *ptr, int len)
434 unsigned char func, flag;
436 unsigned char *end = ptr + len;
438 if (terminit()) { /* go ahead */
441 if (ptr >= end) break;
443 if (ptr >= end) break;
446 process_slc(func, flag, val);
451 * save this slc buffer if it is the first, otherwise dump
454 if (def_slcbuf == (unsigned char *)0) {
456 def_slcbuf = (unsigned char *)malloc((unsigned)len);
457 if (def_slcbuf == (unsigned char *)0)
458 return; /* too bad */
459 memmove(def_slcbuf, ptr, len);
463 } /* end of do_opt_slc */
468 * Do slc stuff that was deferred.
475 do_opt_slc(def_slcbuf, def_slclen);
478 def_slcbuf = (unsigned char *)0;
482 } /* end of deferslc */
484 #endif /* LINEMODE */