libexec/getty/subr.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)from: subr.c     8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/libexec/getty/subr.c,v 1.16.2.1 2001/05/12 10:16:51 kris Exp $
  31  */
  32
  33 /*
  34  * Melbourne getty.
  35  */
  36 #define COMPAT_43
  37 #ifdef DEBUG
  38 #include <stdio.h>
  39 #endif
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <termios.h>
  43 #include <unistd.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <syslog.h>
  48
  49 #include "gettytab.h"
  50 #include "pathnames.h"
  51 #include "extern.h"
  52
  53
  54 #ifdef COMPAT_43
  55 static void     compatflags (long);
  56 #endif
  57
  58 /*
  59  * Get a table entry.
  60  */
  61 void
  62 gettable(const char *name, char *buf)
  63 {
  64         struct gettystrs *sp;
  65         struct gettynums *np;
  66         struct gettyflags *fp;
  67         long n;
  68         int l;
  69         char *p;
  70         char *msg = NULL;
  71         const char *dba[2];
  72
  73         static int firsttime = 1;
  74
  75         dba[0] = _PATH_GETTYTAB;
  76         dba[1] = NULL;
  77
  78         if (firsttime) {
  79                 /*
  80                  * we need to strdup() anything in the strings array
  81                  * initially in order to simplify things later
  82                  */
  83                 for (sp = gettystrs; sp->field; sp++)
  84                         if (sp->value != NULL) {
  85                                 /* handle these ones more carefully */
  86                                 if (sp >= &gettystrs[4] && sp <= &gettystrs[6])
  87                                         l = 2;
  88                                 else
  89                                         l = strlen(sp->value) + 1;
  90                                 if ((p = malloc(l)) != NULL) {
  91                                         strncpy(p, sp->value, l);
  92                                         p[l-1] = '\0';
  93                                 }
  94                                 /*
  95                                  * replace, even if NULL, else we'll
  96                                  * have problems with free()ing static mem
  97                                  */
  98                                 sp->value = p;
  99                         }
 100                 firsttime = 0;
 101         }
 102
 103         switch (cgetent(&buf, (char **)dba, (char *)name)) {
 104         case 1:
 105                 msg = "%s: couldn't resolve 'tc=' in gettytab '%s'";
 106         case 0:
 107                 break;
 108         case -1:
 109                 msg = "%s: unknown gettytab entry '%s'";
 110                 break;
 111         case -2:
 112                 msg = "%s: retrieving gettytab entry '%s': %m";
 113                 break;
 114         case -3:
 115                 msg = "%s: recursive 'tc=' reference gettytab entry '%s'";
 116                 break;
 117         default:
 118                 msg = "%s: unexpected cgetent() error for entry '%s'";
 119                 break;
 120         }
 121
 122         if (msg != NULL) {
 123                 syslog(LOG_ERR, msg, "getty", name);
 124                 return;
 125         }
 126
 127         for (sp = gettystrs; sp->field; sp++) {
 128                 if ((l = cgetstr(buf, (char*)sp->field, &p)) >= 0) {
 129                         if (sp->value) {
 130                                 /* prefer existing value */
 131                                 if (strcmp(p, sp->value) != 0)
 132                                         free(sp->value);
 133                                 else {
 134                                         free(p);
 135                                         p = sp->value;
 136                                 }
 137                         }
 138                         sp->value = p;
 139                 } else if (l == -1) {
 140                         free(sp->value);
 141                         sp->value = NULL;
 142                 }
 143         }
 144
 145         for (np = gettynums; np->field; np++) {
 146                 if (cgetnum(buf, (char*)np->field, &n) == -1)
 147                         np->set = 0;
 148                 else {
 149                         np->set = 1;
 150                         np->value = n;
 151                 }
 152         }
 153
 154         for (fp = gettyflags; fp->field; fp++) {
 155                 if (cgetcap(buf, (char *)fp->field, ':') == NULL)
 156                         fp->set = 0;
 157                 else {
 158                         fp->set = 1;
 159                         fp->value = 1 ^ fp->invrt;
 160                 }
 161         }
 162
 163 #ifdef DEBUG
 164         printf("name=\"%s\", buf=\"%s\"\r\n", name, buf);
 165         for (sp = gettystrs; sp->field; sp++)
 166                 printf("cgetstr: %s=%s\r\n", sp->field, sp->value);
 167         for (np = gettynums; np->field; np++)
 168                 printf("cgetnum: %s=%d\r\n", np->field, np->value);
 169         for (fp = gettyflags; fp->field; fp++)
 170                 printf("cgetflags: %s='%c' set='%c'\r\n", fp->field,
 171                        fp->value + '0', fp->set + '0');
 172 #endif /* DEBUG */
 173 }
 174
 175 void
 176 gendefaults(void)
 177 {
 178         struct gettystrs *sp;
 179         struct gettynums *np;
 180         struct gettyflags *fp;
 181
 182         for (sp = gettystrs; sp->field; sp++)
 183                 if (sp->value)
 184                         sp->defalt = strdup(sp->value);
 185         for (np = gettynums; np->field; np++)
 186                 if (np->set)
 187                         np->defalt = np->value;
 188         for (fp = gettyflags; fp->field; fp++)
 189                 if (fp->set)
 190                         fp->defalt = fp->value;
 191                 else
 192                         fp->defalt = fp->invrt;
 193 }
 194
 195 void
 196 setdefaults(void)
 197 {
 198         struct gettystrs *sp;
 199         struct gettynums *np;
 200         struct gettyflags *fp;
 201
 202         for (sp = gettystrs; sp->field; sp++)
 203                 if (!sp->value)
 204                         sp->value = !sp->defalt ? sp->defalt
 205                                                 : strdup(sp->defalt);
 206         for (np = gettynums; np->field; np++)
 207                 if (!np->set)
 208                         np->value = np->defalt;
 209         for (fp = gettyflags; fp->field; fp++)
 210                 if (!fp->set)
 211                         fp->value = fp->defalt;
 212 }
 213
 214 static char **
 215 charnames[] = {
 216         &ER, &KL, &IN, &QU, &XN, &XF, &ET, &BK,
 217         &SU, &DS, &RP, &FL, &WE, &LN, 0
 218 };
 219
 220 static char *
 221 charvars[] = {
 222         &tmode.c_cc[VERASE], &tmode.c_cc[VKILL], &tmode.c_cc[VINTR],
 223         &tmode.c_cc[VQUIT], &tmode.c_cc[VSTART], &tmode.c_cc[VSTOP],
 224         &tmode.c_cc[VEOF], &tmode.c_cc[VEOL], &tmode.c_cc[VSUSP],
 225         &tmode.c_cc[VDSUSP], &tmode.c_cc[VREPRINT], &tmode.c_cc[VDISCARD],
 226         &tmode.c_cc[VWERASE], &tmode.c_cc[VLNEXT], 0
 227 };
 228
 229 void
 230 setchars(void)
 231 {
 232         int i;
 233         const char *p;
 234
 235         for (i = 0; charnames[i]; i++) {
 236                 p = *charnames[i];
 237                 if (p && *p)
 238                         *charvars[i] = *p;
 239                 else
 240                         *charvars[i] = _POSIX_VDISABLE;
 241         }
 242 }
 243
 244 /* Macros to clear/set/test flags. */
 245 #define SET(t, f)       (t) |= (f)
 246 #define CLR(t, f)       (t) &= ~(f)
 247 #define ISSET(t, f)     ((t) & (f))
 248
 249 void
 250 set_flags(int n)
 251 {
 252         tcflag_t iflag, oflag, cflag, lflag;
 253
 254 #ifdef COMPAT_43
 255         switch (n) {
 256         case 0:
 257                 if (F0set) {
 258                         compatflags(F0);
 259                         return;
 260                 }
 261                 break;
 262         case 1:
 263                 if (F1set) {
 264                         compatflags(F1);
 265                         return;
 266                 }
 267                 break;
 268         default:
 269                 if (F2set) {
 270                         compatflags(F2);
 271                         return;
 272                 }
 273                 break;
 274         }
 275 #endif
 276
 277         switch (n) {
 278         case 0:
 279                 if (C0set && I0set && L0set && O0set) {
 280                         tmode.c_cflag = C0;
 281                         tmode.c_iflag = I0;
 282                         tmode.c_lflag = L0;
 283                         tmode.c_oflag = O0;
 284                         return;
 285                 }
 286                 break;
 287         case 1:
 288                 if (C1set && I1set && L1set && O1set) {
 289                         tmode.c_cflag = C1;
 290                         tmode.c_iflag = I1;
 291                         tmode.c_lflag = L1;
 292                         tmode.c_oflag = O1;
 293                         return;
 294                 }
 295                 break;
 296         default:
 297                 if (C2set && I2set && L2set && O2set) {
 298                         tmode.c_cflag = C2;
 299                         tmode.c_iflag = I2;
 300                         tmode.c_lflag = L2;
 301                         tmode.c_oflag = O2;
 302                         return;
 303                 }
 304                 break;
 305         }
 306
 307         iflag = omode.c_iflag;
 308         oflag = omode.c_oflag;
 309         cflag = omode.c_cflag;
 310         lflag = omode.c_lflag;
 311
 312         if (NP) {
 313                 CLR(cflag, CSIZE|PARENB);
 314                 SET(cflag, CS8);
 315                 CLR(iflag, ISTRIP|INPCK|IGNPAR);
 316         } else if (AP || EP || OP) {
 317                 CLR(cflag, CSIZE);
 318                 SET(cflag, CS7|PARENB);
 319                 SET(iflag, ISTRIP);
 320                 if (OP && !EP) {
 321                         SET(iflag, INPCK|IGNPAR);
 322                         SET(cflag, PARODD);
 323                         if (AP)
 324                                 CLR(iflag, INPCK);
 325                 } else if (EP && !OP) {
 326                         SET(iflag, INPCK|IGNPAR);
 327                         CLR(cflag, PARODD);
 328                         if (AP)
 329                                 CLR(iflag, INPCK);
 330                 } else if (AP || (EP && OP)) {
 331                         CLR(iflag, INPCK|IGNPAR);
 332                         CLR(cflag, PARODD);
 333                 }
 334         } /* else, leave as is */
 335
 336 #if 0
 337         if (UC)
 338                 f |= LCASE;
 339 #endif
 340
 341         if (HC)
 342                 SET(cflag, HUPCL);
 343         else
 344                 CLR(cflag, HUPCL);
 345
 346         if (MB)
 347                 SET(cflag, MDMBUF);
 348         else
 349                 CLR(cflag, MDMBUF);
 350
 351         if (HW)
 352                 SET(cflag, CRTSCTS);
 353         else
 354                 CLR(cflag, CRTSCTS);
 355
 356         if (NL) {
 357                 SET(iflag, ICRNL);
 358                 SET(oflag, ONLCR|OPOST);
 359         } else {
 360                 CLR(iflag, ICRNL);
 361                 CLR(oflag, ONLCR);
 362         }
 363
 364         if (!HT)
 365                 SET(oflag, OXTABS|OPOST);
 366         else
 367                 CLR(oflag, OXTABS);
 368
 369 #ifdef XXX_DELAY
 370         SET(f, delaybits());
 371 #endif
 372
 373         if (n == 1) {           /* read mode flags */
 374                 if (RW) {
 375                         iflag = 0;
 376                         CLR(oflag, OPOST);
 377                         CLR(cflag, CSIZE|PARENB);
 378                         SET(cflag, CS8);
 379                         lflag = 0;
 380                 } else {
 381                         CLR(lflag, ICANON);
 382                 }
 383                 goto out;
 384         }
 385
 386         if (n == 0)
 387                 goto out;
 388
 389 #if 0
 390         if (CB)
 391                 SET(f, CRTBS);
 392 #endif
 393
 394         if (CE)
 395                 SET(lflag, ECHOE);
 396         else
 397                 CLR(lflag, ECHOE);
 398
 399         if (CK)
 400                 SET(lflag, ECHOKE);
 401         else
 402                 CLR(lflag, ECHOKE);
 403
 404         if (PE)
 405                 SET(lflag, ECHOPRT);
 406         else
 407                 CLR(lflag, ECHOPRT);
 408
 409         if (EC)
 410                 SET(lflag, ECHO);
 411         else
 412                 CLR(lflag, ECHO);
 413
 414         if (XC)
 415                 SET(lflag, ECHOCTL);
 416         else
 417                 CLR(lflag, ECHOCTL);
 418
 419         if (DX)
 420                 SET(lflag, IXANY);
 421         else
 422                 CLR(lflag, IXANY);
 423
 424 out:
 425         tmode.c_iflag = iflag;
 426         tmode.c_oflag = oflag;
 427         tmode.c_cflag = cflag;
 428         tmode.c_lflag = lflag;
 429 }
 430
 431 #ifdef COMPAT_43
 432 /*
 433  * Old TTY => termios, snatched from <sys/kern/tty_compat.c>
 434  */
 435 void
 436 compatflags(long flags)
 437 {
 438         tcflag_t iflag, oflag, cflag, lflag;
 439
 440         iflag = BRKINT|ICRNL|IMAXBEL|IXON|IXANY;
 441         oflag = OPOST|ONLCR|OXTABS;
 442         cflag = CREAD;
 443         lflag = ICANON|ISIG|IEXTEN;
 444
 445         if (ISSET(flags, TANDEM))
 446                 SET(iflag, IXOFF);
 447         else
 448                 CLR(iflag, IXOFF);
 449         if (ISSET(flags, ECHO))
 450                 SET(lflag, ECHO);
 451         else
 452                 CLR(lflag, ECHO);
 453         if (ISSET(flags, CRMOD)) {
 454                 SET(iflag, ICRNL);
 455                 SET(oflag, ONLCR);
 456         } else {
 457                 CLR(iflag, ICRNL);
 458                 CLR(oflag, ONLCR);
 459         }
 460         if (ISSET(flags, XTABS))
 461                 SET(oflag, OXTABS);
 462         else
 463                 CLR(oflag, OXTABS);
 464
 465
 466         if (ISSET(flags, RAW)) {
 467                 iflag &= IXOFF;
 468                 CLR(lflag, ISIG|ICANON|IEXTEN);
 469                 CLR(cflag, PARENB);
 470         } else {
 471                 SET(iflag, BRKINT|IXON|IMAXBEL);
 472                 SET(lflag, ISIG|IEXTEN);
 473                 if (ISSET(flags, CBREAK))
 474                         CLR(lflag, ICANON);
 475                 else
 476                         SET(lflag, ICANON);
 477                 switch (ISSET(flags, ANYP)) {
 478                 case 0:
 479                         CLR(cflag, PARENB);
 480                         break;
 481                 case ANYP:
 482                         SET(cflag, PARENB);
 483                         CLR(iflag, INPCK);
 484                         break;
 485                 case EVENP:
 486                         SET(cflag, PARENB);
 487                         SET(iflag, INPCK);
 488                         CLR(cflag, PARODD);
 489                         break;
 490                 case ODDP:
 491                         SET(cflag, PARENB);
 492                         SET(iflag, INPCK);
 493                         SET(cflag, PARODD);
 494                         break;
 495                 }
 496         }
 497
 498         /* Nothing we can do with CRTBS. */
 499         if (ISSET(flags, PRTERA))
 500                 SET(lflag, ECHOPRT);
 501         else
 502                 CLR(lflag, ECHOPRT);
 503         if (ISSET(flags, CRTERA))
 504                 SET(lflag, ECHOE);
 505         else
 506                 CLR(lflag, ECHOE);
 507         /* Nothing we can do with TILDE. */
 508         if (ISSET(flags, MDMBUF))
 509                 SET(cflag, MDMBUF);
 510         else
 511                 CLR(cflag, MDMBUF);
 512         if (ISSET(flags, NOHANG))
 513                 CLR(cflag, HUPCL);
 514         else
 515                 SET(cflag, HUPCL);
 516         if (ISSET(flags, CRTKIL))
 517                 SET(lflag, ECHOKE);
 518         else
 519                 CLR(lflag, ECHOKE);
 520         if (ISSET(flags, CTLECH))
 521                 SET(lflag, ECHOCTL);
 522         else
 523                 CLR(lflag, ECHOCTL);
 524         if (!ISSET(flags, DECCTQ))
 525                 SET(iflag, IXANY);
 526         else
 527                 CLR(iflag, IXANY);
 528         CLR(lflag, TOSTOP|FLUSHO|PENDIN|NOFLSH);
 529         SET(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));
 530
 531         if (ISSET(flags, RAW|LITOUT|PASS8)) {
 532                 CLR(cflag, CSIZE);
 533                 SET(cflag, CS8);
 534                 if (!ISSET(flags, RAW|PASS8))
 535                         SET(iflag, ISTRIP);
 536                 else
 537                         CLR(iflag, ISTRIP);
 538                 if (!ISSET(flags, RAW|LITOUT))
 539                         SET(oflag, OPOST);
 540                 else
 541                         CLR(oflag, OPOST);
 542         } else {
 543                 CLR(cflag, CSIZE);
 544                 SET(cflag, CS7);
 545                 SET(iflag, ISTRIP);
 546                 SET(oflag, OPOST);
 547         }
 548
 549         tmode.c_iflag = iflag;
 550         tmode.c_oflag = oflag;
 551         tmode.c_cflag = cflag;
 552         tmode.c_lflag = lflag;
 553 }
 554 #endif
 555
 556 #ifdef XXX_DELAY
 557 struct delayval {
 558         unsigned        delay;          /* delay in ms */
 559         int             bits;
 560 };
 561
 562 /*
 563  * below are random guesses, I can't be bothered checking
 564  */
 565
 566 struct delayval crdelay[] = {
 567         { 1,            CR1 },
 568         { 2,            CR2 },
 569         { 3,            CR3 },
 570         { 83,           CR1 },
 571         { 166,          CR2 },
 572         { 0,            CR3 },
 573 };
 574
 575 struct delayval nldelay[] = {
 576         { 1,            NL1 },          /* special, calculated */
 577         { 2,            NL2 },
 578         { 3,            NL3 },
 579         { 100,          NL2 },
 580         { 0,            NL3 },
 581 };
 582
 583 struct delayval bsdelay[] = {
 584         { 1,            BS1 },
 585         { 0,            0 },
 586 };
 587
 588 struct delayval ffdelay[] = {
 589         { 1,            FF1 },
 590         { 1750,         FF1 },
 591         { 0,            FF1 },
 592 };
 593
 594 struct delayval tbdelay[] = {
 595         { 1,            TAB1 },
 596         { 2,            TAB2 },
 597         { 3,            XTABS },        /* this is expand tabs */
 598         { 100,          TAB1 },
 599         { 0,            TAB2 },
 600 };
 601
 602 int
 603 delaybits(void)
 604 {
 605         int f;
 606
 607         f  = adelay(CD, crdelay);
 608         f |= adelay(ND, nldelay);
 609         f |= adelay(FD, ffdelay);
 610         f |= adelay(TD, tbdelay);
 611         f |= adelay(BD, bsdelay);
 612         return (f);
 613 }
 614
 615 int
 616 adelay(int ms, struct delayval *dp)
 617 {
 618         if (ms == 0)
 619                 return (0);
 620         while (dp->delay && ms > dp->delay)
 621                 dp++;
 622         return (dp->bits);
 623 }
 624 #endif
 625
 626 char    editedhost[MAXHOSTNAMELEN];
 627
 628 void
 629 edithost(const char *pat)
 630 {
 631         const char *host = HN;
 632         char *res = editedhost;
 633
 634         if (!pat)
 635                 pat = "";
 636         while (*pat) {
 637                 switch (*pat) {
 638
 639                 case '#':
 640                         if (*host)
 641                                 host++;
 642                         break;
 643
 644                 case '@':
 645                         if (*host)
 646                                 *res++ = *host++;
 647                         break;
 648
 649                 default:
 650                         *res++ = *pat;
 651                         break;
 652
 653                 }
 654                 if (res == &editedhost[sizeof editedhost - 1]) {
 655                         *res = '\0';
 656                         return;
 657                 }
 658                 pat++;
 659         }
 660         if (*host)
 661                 strncpy(res, host, sizeof editedhost - (res - editedhost) - 1);
 662         else
 663                 *res = '\0';
 664         editedhost[sizeof editedhost - 1] = '\0';
 665 }
 666
 667 static struct speedtab {
 668         int     speed;
 669         int     uxname;
 670 } speedtab[] = {
 671         { 50,   B50 },
 672         { 75,   B75 },
 673         { 110,  B110 },
 674         { 134,  B134 },
 675         { 150,  B150 },
 676         { 200,  B200 },
 677         { 300,  B300 },
 678         { 600,  B600 },
 679         { 1200, B1200 },
 680         { 1800, B1800 },
 681         { 2400, B2400 },
 682         { 4800, B4800 },
 683         { 9600, B9600 },
 684         { 19200, EXTA },
 685         { 19,   EXTA },         /* for people who say 19.2K */
 686         { 38400, EXTB },
 687         { 38,   EXTB },
 688         { 7200, EXTB },         /* alternative */
 689         { 57600, B57600 },
 690         { 115200, B115200 },
 691         { 230400, B230400 },
 692         { 0 }
 693 };
 694
 695 int
 696 speed(int val)
 697 {
 698         struct speedtab *sp;
 699
 700         if (val <= B230400)
 701                 return (val);
 702
 703         for (sp = speedtab; sp->speed; sp++)
 704                 if (sp->speed == val)
 705                         return (sp->uxname);
 706
 707         return (B300);          /* default in impossible cases */
 708 }
 709
 710 void
 711 makeenv(char *env[])
 712 {
 713         static char termbuf[128] = "TERM=";
 714         char *p, *q;
 715         char **ep;
 716
 717         ep = env;
 718         if (TT && *TT) {
 719                 strlcat(termbuf, TT, sizeof(termbuf));
 720                 *ep++ = termbuf;
 721         }
 722         if ((p = EV)) {
 723                 q = p;
 724                 while ((q = strchr(q, ','))) {
 725                         *q++ = '\0';
 726                         *ep++ = p;
 727                         p = q;
 728                 }
 729                 if (*p)
 730                         *ep++ = p;
 731         }
 732         *ep = NULL;
 733 }
 734
 735 /*
 736  * This speed select mechanism is written for the Develcon DATASWITCH.
 737  * The Develcon sends a string of the form "B{speed}\n" at a predefined
 738  * baud rate. This string indicates the user's actual speed.
 739  * The routine below returns the terminal type mapped from derived speed.
 740  */
 741 struct  portselect {
 742         const char      *ps_baud;
 743         const char      *ps_type;
 744 } portspeeds[] = {
 745         { "B110",       "std.110" },
 746         { "B134",       "std.134" },
 747         { "B150",       "std.150" },
 748         { "B300",       "std.300" },
 749         { "B600",       "std.600" },
 750         { "B1200",      "std.1200" },
 751         { "B2400",      "std.2400" },
 752         { "B4800",      "std.4800" },
 753         { "B9600",      "std.9600" },
 754         { "B19200",     "std.19200" },
 755         { 0 }
 756 };
 757
 758 const char *
 759 portselector(void)
 760 {
 761         char c, baud[20];
 762         const char *type = "default";
 763         struct portselect *ps;
 764         int len;
 765
 766         alarm(5*60);
 767         for (len = 0; len < sizeof (baud) - 1; len++) {
 768                 if (read(STDIN_FILENO, &c, 1) <= 0)
 769                         break;
 770                 c &= 0177;
 771                 if (c == '\n' || c == '\r')
 772                         break;
 773                 if (c == 'B')
 774                         len = 0;        /* in case of leading garbage */
 775                 baud[len] = c;
 776         }
 777         baud[len] = '\0';
 778         for (ps = portspeeds; ps->ps_baud; ps++)
 779                 if (strcmp(ps->ps_baud, baud) == 0) {
 780                         type = ps->ps_type;
 781                         break;
 782                 }
 783         sleep(2);       /* wait for connection to complete */
 784         return (type);
 785 }
 786
 787 /*
 788  * This auto-baud speed select mechanism is written for the Micom 600
 789  * portselector. Selection is done by looking at how the character '\r'
 790  * is garbled at the different speeds.
 791  */
 792 const char *
 793 autobaud(void)
 794 {
 795         int rfds;
 796         struct timeval timeout;
 797         char c;
 798         const char *type = "9600-baud";
 799
 800         (void)tcflush(0, TCIOFLUSH);
 801         rfds = 1 << 0;
 802         timeout.tv_sec = 5;
 803         timeout.tv_usec = 0;
 804         if (select(32, (fd_set *)&rfds, NULL, NULL, &timeout) <= 0)
 805                 return (type);
 806         if (read(STDIN_FILENO, &c, sizeof(char)) != sizeof(char))
 807                 return (type);
 808         timeout.tv_sec = 0;
 809         timeout.tv_usec = 20;
 810         (void) select(32, NULL, NULL, NULL, &timeout);
 811         (void)tcflush(0, TCIOFLUSH);
 812         switch (c & 0377) {
 813
 814         case 0200:              /* 300-baud */
 815                 type = "300-baud";
 816                 break;
 817
 818         case 0346:              /* 1200-baud */
 819                 type = "1200-baud";
 820                 break;
 821
 822         case  015:              /* 2400-baud */
 823         case 0215:
 824                 type = "2400-baud";
 825                 break;
 826
 827         default:                /* 4800-baud */
 828                 type = "4800-baud";
 829                 break;
 830
 831         case 0377:              /* 9600-baud */
 832                 type = "9600-baud";
 833                 break;
 834         }
 835         return (type);
 836 }