crypto/ui/ui_openssl.c

   1 /* crypto/ui/ui_openssl.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Richard Levitte (richard@levitte.org) and others
   3  * for the OpenSSL project 2001.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* The lowest level part of this file was previously in crypto/des/read_pwd.c,
  60  * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  61  * All rights reserved.
  62  *
  63  * This package is an SSL implementation written
  64  * by Eric Young (eay@cryptsoft.com).
  65  * The implementation was written so as to conform with Netscapes SSL.
  66  *
  67  * This library is free for commercial and non-commercial use as long as
  68  * the following conditions are aheared to.  The following conditions
  69  * apply to all code found in this distribution, be it the RC4, RSA,
  70  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  71  * included with this distribution is covered by the same copyright terms
  72  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  73  *
  74  * Copyright remains Eric Young's, and as such any Copyright notices in
  75  * the code are not to be removed.
  76  * If this package is used in a product, Eric Young should be given attribution
  77  * as the author of the parts of the library used.
  78  * This can be in the form of a textual message at program startup or
  79  * in documentation (online or textual) provided with the package.
  80  *
  81  * Redistribution and use in source and binary forms, with or without
  82  * modification, are permitted provided that the following conditions
  83  * are met:
  84  * 1. Redistributions of source code must retain the copyright
  85  *    notice, this list of conditions and the following disclaimer.
  86  * 2. Redistributions in binary form must reproduce the above copyright
  87  *    notice, this list of conditions and the following disclaimer in the
  88  *    documentation and/or other materials provided with the distribution.
  89  * 3. All advertising materials mentioning features or use of this software
  90  *    must display the following acknowledgement:
  91  *    "This product includes cryptographic software written by
  92  *     Eric Young (eay@cryptsoft.com)"
  93  *    The word 'cryptographic' can be left out if the rouines from the library
  94  *    being used are not cryptographic related :-).
  95  * 4. If you include any Windows specific code (or a derivative thereof) from
  96  *    the apps directory (application code) you must include an acknowledgement:
  97  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  98  *
  99  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 100  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 101  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 102  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 103  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 104  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 105  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 106  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 107  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 108  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 109  * SUCH DAMAGE.
 110  *
 111  * The licence and distribution terms for any publically available version or
 112  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 113  * copied and put under another distribution licence
 114  * [including the GNU Public Licence.]
 115  */
 116
 117
 118 #include <openssl/e_os2.h>
 119
 120 #if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
 121 # ifdef OPENSSL_UNISTD
 122 #  include OPENSSL_UNISTD
 123 # else
 124 #  include <unistd.h>
 125 # endif
 126 /* If unistd.h defines _POSIX_VERSION, we conclude that we
 127  * are on a POSIX system and have sigaction and termios. */
 128 # if defined(_POSIX_VERSION)
 129
 130 #  define SIGACTION
 131 #  if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
 132 #   define TERMIOS
 133 #  endif
 134
 135 # endif
 136 #endif
 137
 138 #ifdef WIN16TTY
 139 # undef OPENSSL_SYS_WIN16
 140 # undef WIN16
 141 # undef _WINDOWS
 142 # include <graph.h>
 143 #endif
 144
 145 /* 06-Apr-92 Luke Brennan    Support for VMS */
 146 #include "ui_locl.h"
 147 #include "cryptlib.h"
 148 #include <signal.h>
 149 #include <stdio.h>
 150 #include <string.h>
 151 #include <errno.h>
 152
 153 #ifdef OPENSSL_SYS_VMS          /* prototypes for sys$whatever */
 154 # include <starlet.h>
 155 # ifdef __DECC
 156 #  pragma message disable DOLLARID
 157 # endif
 158 #endif
 159
 160 #ifdef WIN_CONSOLE_BUG
 161 # include <windows.h>
 162 # include <wincon.h>
 163 #endif
 164
 165
 166 /* There are 5 types of terminal interface supported,
 167  * TERMIO, TERMIOS, VMS, MSDOS and SGTTY
 168  */
 169
 170 #if defined(__sgi) && !defined(TERMIOS)
 171 # define TERMIOS
 172 # undef  TERMIO
 173 # undef  SGTTY
 174 #endif
 175
 176 #if defined(linux) && !defined(TERMIO)
 177 # undef  TERMIOS
 178 # define TERMIO
 179 # undef  SGTTY
 180 #endif
 181
 182 #ifdef _LIBC
 183 # undef  TERMIOS
 184 # define TERMIO
 185 # undef  SGTTY
 186 #endif
 187
 188 #if !defined(TERMIO) && !defined(TERMIOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(MAC_OS_GUSI_SOURCE)
 189 # undef  TERMIOS
 190 # undef  TERMIO
 191 # define SGTTY
 192 #endif
 193
 194 #ifdef TERMIOS
 195 # include <termios.h>
 196 # define TTY_STRUCT             struct termios
 197 # define TTY_FLAGS              c_lflag
 198 # define TTY_get(tty,data)      tcgetattr(tty,data)
 199 # define TTY_set(tty,data)      tcsetattr(tty,TCSANOW,data)
 200 #endif
 201
 202 #ifdef TERMIO
 203 # include <termio.h>
 204 # define TTY_STRUCT             struct termio
 205 # define TTY_FLAGS              c_lflag
 206 # define TTY_get(tty,data)      ioctl(tty,TCGETA,data)
 207 # define TTY_set(tty,data)      ioctl(tty,TCSETA,data)
 208 #endif
 209
 210 #ifdef SGTTY
 211 # include <sgtty.h>
 212 # define TTY_STRUCT             struct sgttyb
 213 # define TTY_FLAGS              sg_flags
 214 # define TTY_get(tty,data)      ioctl(tty,TIOCGETP,data)
 215 # define TTY_set(tty,data)      ioctl(tty,TIOCSETP,data)
 216 #endif
 217
 218 #if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC)
 219 # include <sys/ioctl.h>
 220 #endif
 221
 222 #ifdef OPENSSL_SYS_MSDOS
 223 # include <conio.h>
 224 #endif
 225
 226 #ifdef OPENSSL_SYS_VMS
 227 # include <ssdef.h>
 228 # include <iodef.h>
 229 # include <ttdef.h>
 230 # include <descrip.h>
 231 struct IOSB {
 232         short iosb$w_value;
 233         short iosb$w_count;
 234         long  iosb$l_info;
 235         };
 236 #endif
 237
 238 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) || defined(MAC_OS_GUSI_SOURCE)
 239 /*
 240  * This one needs work. As a matter of fact the code is unoperational
 241  * and this is only a trick to get it compiled.
 242  *                                      <appro@fy.chalmers.se>
 243  */
 244 # define TTY_STRUCT int
 245 #endif
 246
 247 #ifndef NX509_SIG
 248 # define NX509_SIG 32
 249 #endif
 250
 251
 252 /* Define globals.  They are protected by a lock */
 253 #ifdef SIGACTION
 254 static struct sigaction savsig[NX509_SIG];
 255 #else
 256 static void (*savsig[NX509_SIG])(int );
 257 #endif
 258
 259 #ifdef OPENSSL_SYS_VMS
 260 static struct IOSB iosb;
 261 static $DESCRIPTOR(terminal,"TT");
 262 static long tty_orig[3], tty_new[3]; /* XXX   Is there any guarantee that this will always suffice for the actual structures? */
 263 static long status;
 264 static unsigned short channel = 0;
 265 #else
 266 #ifndef OPENSSL_SYS_MSDOS
 267 static TTY_STRUCT tty_orig,tty_new;
 268 #endif
 269 #endif
 270 static FILE *tty_in, *tty_out;
 271 static int is_a_tty;
 272
 273 /* Declare static functions */
 274 static void read_till_nl(FILE *);
 275 static void recsig(int);
 276 static void pushsig(void);
 277 static void popsig(void);
 278 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
 279 static int noecho_fgets(char *buf, int size, FILE *tty);
 280 #endif
 281 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);
 282
 283 static int read_string(UI *ui, UI_STRING *uis);
 284 static int write_string(UI *ui, UI_STRING *uis);
 285
 286 static int open_console(UI *ui);
 287 static int echo_console(UI *ui);
 288 static int noecho_console(UI *ui);
 289 static int close_console(UI *ui);
 290
 291 static UI_METHOD ui_openssl =
 292         {
 293         "OpenSSL default user interface",
 294         open_console,
 295         write_string,
 296         NULL,                   /* No flusher is needed for command lines */
 297         read_string,
 298         close_console,
 299         NULL
 300         };
 301
 302 /* The method with all the built-in thingies */
 303 UI_METHOD *UI_OpenSSL(void)
 304         {
 305         return &ui_openssl;
 306         }
 307
 308 /* The following function makes sure that info and error strings are printed
 309    before any prompt. */
 310 static int write_string(UI *ui, UI_STRING *uis)
 311         {
 312         switch (UI_get_string_type(uis))
 313                 {
 314         case UIT_ERROR:
 315         case UIT_INFO:
 316                 fputs(UI_get0_output_string(uis), tty_out);
 317                 fflush(tty_out);
 318                 break;
 319         default:
 320                 break;
 321                 }
 322         return 1;
 323         }
 324
 325 static int read_string(UI *ui, UI_STRING *uis)
 326         {
 327         int ok = 0;
 328
 329         switch (UI_get_string_type(uis))
 330                 {
 331         case UIT_BOOLEAN:
 332                 fputs(UI_get0_output_string(uis), tty_out);
 333                 fputs(UI_get0_action_string(uis), tty_out);
 334                 fflush(tty_out);
 335                 return read_string_inner(ui, uis,
 336                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 0);
 337         case UIT_PROMPT:
 338                 fputs(UI_get0_output_string(uis), tty_out);
 339                 fflush(tty_out);
 340                 return read_string_inner(ui, uis,
 341                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1);
 342         case UIT_VERIFY:
 343                 fprintf(tty_out,"Verifying - %s",
 344                         UI_get0_output_string(uis));
 345                 fflush(tty_out);
 346                 if ((ok = read_string_inner(ui, uis,
 347                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1)) <= 0)
 348                         return ok;
 349                 if (strcmp(UI_get0_result_string(uis),
 350                         UI_get0_test_string(uis)) != 0)
 351                         {
 352                         fprintf(tty_out,"Verify failure\n");
 353                         fflush(tty_out);
 354                         return 0;
 355                         }
 356                 break;
 357         default:
 358                 break;
 359                 }
 360         return 1;
 361         }
 362
 363
 364 /* Internal functions to read a string without echoing */
 365 static void read_till_nl(FILE *in)
 366         {
 367 #define SIZE 4
 368         char buf[SIZE+1];
 369
 370         do      {
 371                 fgets(buf,SIZE,in);
 372                 } while (strchr(buf,'\n') == NULL);
 373         }
 374
 375 static sig_atomic_t intr_signal;
 376
 377 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
 378         {
 379         static int ps;
 380         int ok;
 381         char result[BUFSIZ];
 382         int maxsize = BUFSIZ-1;
 383         char *p;
 384
 385 #ifndef OPENSSL_SYS_WIN16
 386         intr_signal=0;
 387         ok=0;
 388         ps=0;
 389
 390         pushsig();
 391         ps=1;
 392
 393         if (!echo && !noecho_console(ui))
 394                 goto error;
 395         ps=2;
 396
 397         result[0]='\0';
 398 #ifdef OPENSSL_SYS_MSDOS
 399         if (!echo)
 400                 {
 401                 noecho_fgets(result,maxsize,tty_in);
 402                 p=result; /* FIXME: noecho_fgets doesn't return errors */
 403                 }
 404         else
 405                 p=fgets(result,maxsize,tty_in);
 406 #else
 407         p=fgets(result,maxsize,tty_in);
 408 #endif
 409         if(!p)
 410                 goto error;
 411         if (feof(tty_in)) goto error;
 412         if (ferror(tty_in)) goto error;
 413         if ((p=(char *)strchr(result,'\n')) != NULL)
 414                 {
 415                 if (strip_nl)
 416                         *p='\0';
 417                 }
 418         else
 419                 read_till_nl(tty_in);
 420         if (UI_set_result(ui, uis, result) >= 0)
 421                 ok=1;
 422
 423 error:
 424         if (intr_signal == SIGINT)
 425                 ok=-1;
 426         if (!echo) fprintf(tty_out,"\n");
 427         if (ps >= 2 && !echo && !echo_console(ui))
 428                 ok=0;
 429
 430         if (ps >= 1)
 431                 popsig();
 432 #else
 433         ok=1;
 434 #endif
 435
 436         memset(result,0,BUFSIZ);
 437         return ok;
 438         }
 439
 440
 441 /* Internal functions to open, handle and close a channel to the console.  */
 442 static int open_console(UI *ui)
 443         {
 444         CRYPTO_w_lock(CRYPTO_LOCK_UI);
 445         is_a_tty = 1;
 446
 447 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC)
 448         tty_in=stdin;
 449         tty_out=stderr;
 450 #else
 451 #  ifdef OPENSSL_SYS_MSDOS
 452 #    define DEV_TTY "con"
 453 #  else
 454 #    define DEV_TTY "/dev/tty"
 455 #  endif
 456         if ((tty_in=fopen(DEV_TTY,"r")) == NULL)
 457                 tty_in=stdin;
 458         if ((tty_out=fopen(DEV_TTY,"w")) == NULL)
 459                 tty_out=stderr;
 460 #endif
 461
 462 #if defined(TTY_get) && !defined(VMS)
 463         if (TTY_get(fileno(tty_in),&tty_orig) == -1)
 464                 {
 465 #ifdef ENOTTY
 466                 if (errno == ENOTTY)
 467                         is_a_tty=0;
 468                 else
 469 #endif
 470 #ifdef EINVAL
 471                 /* Ariel Glenn ariel@columbia.edu reports that solaris
 472                  * can return EINVAL instead.  This should be ok */
 473                 if (errno == EINVAL)
 474                         is_a_tty=0;
 475                 else
 476 #endif
 477                         return 0;
 478                 }
 479 #endif
 480 #ifdef OPENSSL_SYS_VMS
 481         status = sys$assign(&terminal,&channel,0,0);
 482         if (status != SS$_NORMAL)
 483                 return 0;
 484         status=sys$qiow(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
 485         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 486                 return 0;
 487 #endif
 488         return 1;
 489         }
 490
 491 static int noecho_console(UI *ui)
 492         {
 493 #ifdef TTY_FLAGS
 494         memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 495         tty_new.TTY_FLAGS &= ~ECHO;
 496 #endif
 497
 498 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 499         if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 500                 return 0;
 501 #endif
 502 #ifdef OPENSSL_SYS_VMS
 503         tty_new[0] = tty_orig[0];
 504         tty_new[1] = tty_orig[1] | TT$M_NOECHO;
 505         tty_new[2] = tty_orig[2];
 506         status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 507         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 508                 return 0;
 509 #endif
 510         return 1;
 511         }
 512
 513 static int echo_console(UI *ui)
 514         {
 515 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 516         memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 517         tty_new.TTY_FLAGS |= ECHO;
 518 #endif
 519
 520 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 521         if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 522                 return 0;
 523 #endif
 524 #ifdef OPENSSL_SYS_VMS
 525         tty_new[0] = tty_orig[0];
 526         tty_new[1] = tty_orig[1] & ~TT$M_NOECHO;
 527         tty_new[2] = tty_orig[2];
 528         status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 529         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 530                 return 0;
 531 #endif
 532         return 1;
 533         }
 534
 535 static int close_console(UI *ui)
 536         {
 537         if (tty_in != stderr) fclose(tty_in);
 538         if (tty_out != stderr) fclose(tty_out);
 539 #ifdef OPENSSL_SYS_VMS
 540         status = sys$dassgn(channel);
 541 #endif
 542         CRYPTO_w_unlock(CRYPTO_LOCK_UI);
 543
 544         return 1;
 545         }
 546
 547
 548 /* Internal functions to handle signals and act on them */
 549 static void pushsig(void)
 550         {
 551         int i;
 552 #ifdef SIGACTION
 553         struct sigaction sa;
 554
 555         memset(&sa,0,sizeof sa);
 556         sa.sa_handler=recsig;
 557 #endif
 558
 559         for (i=1; i<NX509_SIG; i++)
 560                 {
 561 #ifdef SIGUSR1
 562                 if (i == SIGUSR1)
 563                         continue;
 564 #endif
 565 #ifdef SIGUSR2
 566                 if (i == SIGUSR2)
 567                         continue;
 568 #endif
 569 #ifdef SIGKILL
 570                 if (i == SIGKILL) /* We can't make any action on that. */
 571                         continue;
 572 #endif
 573 #ifdef SIGACTION
 574                 sigaction(i,&sa,&savsig[i]);
 575 #else
 576                 savsig[i]=signal(i,recsig);
 577 #endif
 578                 }
 579
 580 #ifdef SIGWINCH
 581         signal(SIGWINCH,SIG_DFL);
 582 #endif
 583         }
 584
 585 static void popsig(void)
 586         {
 587         int i;
 588
 589         for (i=1; i<NX509_SIG; i++)
 590                 {
 591 #ifdef SIGUSR1
 592                 if (i == SIGUSR1)
 593                         continue;
 594 #endif
 595 #ifdef SIGUSR2
 596                 if (i == SIGUSR2)
 597                         continue;
 598 #endif
 599 #ifdef SIGACTION
 600                 sigaction(i,&savsig[i],NULL);
 601 #else
 602                 signal(i,savsig[i]);
 603 #endif
 604                 }
 605         }
 606
 607 static void recsig(int i)
 608         {
 609         intr_signal=i;
 610         }
 611
 612 /* Internal functions specific for Windows */
 613 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
 614 static int noecho_fgets(char *buf, int size, FILE *tty)
 615         {
 616         int i;
 617         char *p;
 618
 619         p=buf;
 620         for (;;)
 621                 {
 622                 if (size == 0)
 623                         {
 624                         *p='\0';
 625                         break;
 626                         }
 627                 size--;
 628 #ifdef WIN16TTY
 629                 i=_inchar();
 630 #else
 631                 i=getch();
 632 #endif
 633                 if (i == '\r') i='\n';
 634                 *(p++)=i;
 635                 if (i == '\n')
 636                         {
 637                         *p='\0';
 638                         break;
 639                         }
 640                 }
 641 #ifdef WIN_CONSOLE_BUG
 642 /* Win95 has several evil console bugs: one of these is that the
 643  * last character read using getch() is passed to the next read: this is
 644  * usually a CR so this can be trouble. No STDIO fix seems to work but
 645  * flushing the console appears to do the trick.
 646  */
 647                 {
 648                         HANDLE inh;
 649                         inh = GetStdHandle(STD_INPUT_HANDLE);
 650                         FlushConsoleInputBuffer(inh);
 651                 }
 652 #endif
 653         return(strlen(buf));
 654         }
 655 #endif