contrib/libedit/src/read.c

   1 /*      $NetBSD: read.c,v 1.71 2014/07/06 18:15:34 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Christos Zoulas of Cornell University.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "config.h"
  36 #if !defined(lint) && !defined(SCCSID)
  37 #if 0
  38 static char sccsid[] = "@(#)read.c      8.1 (Berkeley) 6/4/93";
  39 #else
  40 __RCSID("$NetBSD: read.c,v 1.71 2014/07/06 18:15:34 christos Exp $");
  41 #endif
  42 #endif /* not lint && not SCCSID */
  43
  44 /*
  45  * read.c: Clean this junk up! This is horrible code.
  46  *         Terminal read functions
  47  */
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <unistd.h>
  51 #include <stdlib.h>
  52 #include <limits.h>
  53 #include "el.h"
  54
  55 #define OKCMD   -1      /* must be -1! */
  56
  57 private int     read__fixio(int, int);
  58 private int     read_preread(EditLine *);
  59 private int     read_char(EditLine *, Char *);
  60 private int     read_getcmd(EditLine *, el_action_t *, Char *);
  61 private void    read_pop(c_macro_t *);
  62
  63 /* read_init():
  64  *      Initialize the read stuff
  65  */
  66 protected int
  67 read_init(EditLine *el)
  68 {
  69         /* builtin read_char */
  70         el->el_read.read_char = read_char;
  71         return 0;
  72 }
  73
  74
  75 /* el_read_setfn():
  76  *      Set the read char function to the one provided.
  77  *      If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
  78  */
  79 protected int
  80 el_read_setfn(EditLine *el, el_rfunc_t rc)
  81 {
  82         el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
  83         return 0;
  84 }
  85
  86
  87 /* el_read_getfn():
  88  *      return the current read char function, or EL_BUILTIN_GETCFN
  89  *      if it is the default one
  90  */
  91 protected el_rfunc_t
  92 el_read_getfn(EditLine *el)
  93 {
  94        return el->el_read.read_char == read_char ?
  95             EL_BUILTIN_GETCFN : el->el_read.read_char;
  96 }
  97
  98
  99 #ifndef MIN
 100 #define MIN(A,B) ((A) < (B) ? (A) : (B))
 101 #endif
 102
 103 #ifdef DEBUG_EDIT
 104 private void
 105 read_debug(EditLine *el)
 106 {
 107
 108         if (el->el_line.cursor > el->el_line.lastchar)
 109                 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
 110         if (el->el_line.cursor < el->el_line.buffer)
 111                 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
 112         if (el->el_line.cursor > el->el_line.limit)
 113                 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
 114         if (el->el_line.lastchar > el->el_line.limit)
 115                 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
 116         if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
 117                 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
 118 }
 119 #endif /* DEBUG_EDIT */
 120
 121
 122 /* read__fixio():
 123  *      Try to recover from a read error
 124  */
 125 /* ARGSUSED */
 126 private int
 127 read__fixio(int fd __attribute__((__unused__)), int e)
 128 {
 129
 130         switch (e) {
 131         case -1:                /* Make sure that the code is reachable */
 132
 133 #ifdef EWOULDBLOCK
 134         case EWOULDBLOCK:
 135 #ifndef TRY_AGAIN
 136 #define TRY_AGAIN
 137 #endif
 138 #endif /* EWOULDBLOCK */
 139
 140 #if defined(POSIX) && defined(EAGAIN)
 141 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
 142         case EAGAIN:
 143 #ifndef TRY_AGAIN
 144 #define TRY_AGAIN
 145 #endif
 146 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
 147 #endif /* POSIX && EAGAIN */
 148
 149                 e = 0;
 150 #ifdef TRY_AGAIN
 151 #if defined(F_SETFL) && defined(O_NDELAY)
 152                 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
 153                         return -1;
 154
 155                 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
 156                         return -1;
 157                 else
 158                         e = 1;
 159 #endif /* F_SETFL && O_NDELAY */
 160
 161 #ifdef FIONBIO
 162                 {
 163                         int zero = 0;
 164
 165                         if (ioctl(fd, FIONBIO, &zero) == -1)
 166                                 return -1;
 167                         else
 168                                 e = 1;
 169                 }
 170 #endif /* FIONBIO */
 171
 172 #endif /* TRY_AGAIN */
 173                 return e ? 0 : -1;
 174
 175         case EINTR:
 176                 return 0;
 177
 178         default:
 179                 return -1;
 180         }
 181 }
 182
 183
 184 /* read_preread():
 185  *      Try to read the stuff in the input queue;
 186  */
 187 private int
 188 read_preread(EditLine *el)
 189 {
 190         int chrs = 0;
 191
 192         if (el->el_tty.t_mode == ED_IO)
 193                 return 0;
 194
 195 #ifndef WIDECHAR
 196 /* FIONREAD attempts to buffer up multiple bytes, and to make that work
 197  * properly with partial wide/UTF-8 characters would need some careful work. */
 198 #ifdef FIONREAD
 199         (void) ioctl(el->el_infd, FIONREAD, &chrs);
 200         if (chrs > 0) {
 201                 char buf[EL_BUFSIZ];
 202
 203                 chrs = read(el->el_infd, buf,
 204                     (size_t) MIN(chrs, EL_BUFSIZ - 1));
 205                 if (chrs > 0) {
 206                         buf[chrs] = '\0';
 207                         el_push(el, buf);
 208                 }
 209         }
 210 #endif /* FIONREAD */
 211 #endif
 212         return chrs > 0;
 213 }
 214
 215
 216 /* el_push():
 217  *      Push a macro
 218  */
 219 public void
 220 FUN(el,push)(EditLine *el, const Char *str)
 221 {
 222         c_macro_t *ma = &el->el_chared.c_macro;
 223
 224         if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
 225                 ma->level++;
 226                 if ((ma->macro[ma->level] = Strdup(str)) != NULL)
 227                         return;
 228                 ma->level--;
 229         }
 230         terminal_beep(el);
 231         terminal__flush(el);
 232 }
 233
 234
 235 /* read_getcmd():
 236  *      Get next command from the input stream, return OKCMD on success.
 237  *      Character values > 255 are not looked up in the map, but inserted.
 238  */
 239 private int
 240 read_getcmd(EditLine *el, el_action_t *cmdnum, Char *ch)
 241 {
 242         el_action_t cmd;
 243         int num;
 244
 245         el->el_errno = 0;
 246         do {
 247                 if ((num = FUN(el,getc)(el, ch)) != 1) {/* if EOF or error */
 248                         el->el_errno = num == 0 ? 0 : errno;
 249                         return 0;       /* not OKCMD */
 250                 }
 251
 252 #ifdef  KANJI
 253                 if ((*ch & 0200)) {
 254                         el->el_state.metanext = 0;
 255                         cmd = CcViMap[' '];
 256                         break;
 257                 } else
 258 #endif /* KANJI */
 259
 260                 if (el->el_state.metanext) {
 261                         el->el_state.metanext = 0;
 262                         *ch |= 0200;
 263                 }
 264 #ifdef WIDECHAR
 265                 if (*ch >= N_KEYS)
 266                         cmd = ED_INSERT;
 267                 else
 268 #endif
 269                         cmd = el->el_map.current[(unsigned char) *ch];
 270                 if (cmd == ED_SEQUENCE_LEAD_IN) {
 271                         keymacro_value_t val;
 272                         switch (keymacro_get(el, ch, &val)) {
 273                         case XK_CMD:
 274                                 cmd = val.cmd;
 275                                 break;
 276                         case XK_STR:
 277                                 FUN(el,push)(el, val.str);
 278                                 break;
 279 #ifdef notyet
 280                         case XK_EXE:
 281                                 /* XXX: In the future to run a user function */
 282                                 RunCommand(val.str);
 283                                 break;
 284 #endif
 285                         default:
 286                                 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
 287                                 break;
 288                         }
 289                 }
 290                 if (el->el_map.alt == NULL)
 291                         el->el_map.current = el->el_map.key;
 292         } while (cmd == ED_SEQUENCE_LEAD_IN);
 293         *cmdnum = cmd;
 294         return OKCMD;
 295 }
 296
 297 #ifdef WIDECHAR
 298 /* utf8_islead():
 299  *      Test whether a byte is a leading byte of a UTF-8 sequence.
 300  */
 301 private int
 302 utf8_islead(int c)
 303 {
 304         return c < 0x80 ||             /* single byte char */
 305                (c >= 0xc2 && c <= 0xf4); /* start of multibyte sequence */
 306 }
 307 #endif
 308
 309 /* read_char():
 310  *      Read a character from the tty.
 311  */
 312 private int
 313 read_char(EditLine *el, Char *cp)
 314 {
 315         ssize_t num_read;
 316         int tried = 0;
 317         char cbuf[MB_LEN_MAX];
 318         size_t cbp = 0;
 319         int bytes = 0;
 320
 321  again:
 322         el->el_signal->sig_no = 0;
 323         while ((num_read = read(el->el_infd, cbuf + cbp, (size_t)1)) == -1) {
 324                 int e = errno;
 325                 switch (el->el_signal->sig_no) {
 326                 case SIGCONT:
 327                         FUN(el,set)(el, EL_REFRESH);
 328                         /*FALLTHROUGH*/
 329                 case SIGWINCH:
 330                         sig_set(el);
 331                         goto again;
 332                 default:
 333                         break;
 334                 }
 335                 if (!tried && read__fixio(el->el_infd, e) == 0)
 336                         tried = 1;
 337                 else {
 338                         errno = e;
 339                         *cp = '\0';
 340                         return -1;
 341                 }
 342         }
 343
 344         /* Test for EOF */
 345         if (num_read == 0) {
 346                 errno = 0;
 347                 *cp = '\0';
 348                 return 0;
 349         }
 350
 351 #ifdef WIDECHAR
 352         if (el->el_flags & CHARSET_IS_UTF8) {
 353                 if (!utf8_islead((unsigned char)cbuf[0]))
 354                         goto again; /* discard the byte we read and try again */
 355                 ++cbp;
 356                 if ((bytes = ct_mbtowc(cp, cbuf, cbp)) == -1) {
 357                         ct_mbtowc_reset;
 358                         if (cbp >= MB_LEN_MAX) { /* "shouldn't happen" */
 359                                 errno = EILSEQ;
 360                                 *cp = '\0';
 361                                 return -1;
 362                         }
 363                         goto again;
 364                 }
 365         } else if (isascii((unsigned char)cbuf[0]) ||
 366                 /* we don't support other multibyte charsets */
 367                 ++cbp != 1 ||
 368                 /* Try non-ASCII characters in a 8-bit character set */
 369                 (bytes = ct_mbtowc(cp, cbuf, cbp)) != 1)
 370 #endif
 371                 *cp = (unsigned char)cbuf[0];
 372
 373         if ((el->el_flags & IGNORE_EXTCHARS) && bytes > 1) {
 374                 cbp = 0; /* skip this character */
 375                 goto again;
 376         }
 377
 378         return (int)num_read;
 379 }
 380
 381 /* read_pop():
 382  *      Pop a macro from the stack
 383  */
 384 private void
 385 read_pop(c_macro_t *ma)
 386 {
 387         int i;
 388
 389         el_free(ma->macro[0]);
 390         for (i = 0; i < ma->level; i++)
 391                 ma->macro[i] = ma->macro[i + 1];
 392         ma->level--;
 393         ma->offset = 0;
 394 }
 395
 396 /* el_getc():
 397  *      Read a character
 398  */
 399 public int
 400 FUN(el,getc)(EditLine *el, Char *cp)
 401 {
 402         int num_read;
 403         c_macro_t *ma = &el->el_chared.c_macro;
 404
 405         terminal__flush(el);
 406         for (;;) {
 407                 if (ma->level < 0) {
 408                         if (!read_preread(el))
 409                                 break;
 410                 }
 411
 412                 if (ma->level < 0)
 413                         break;
 414
 415                 if (ma->macro[0][ma->offset] == '\0') {
 416                         read_pop(ma);
 417                         continue;
 418                 }
 419
 420                 *cp = ma->macro[0][ma->offset++];
 421
 422                 if (ma->macro[0][ma->offset] == '\0') {
 423                         /* Needed for QuoteMode On */
 424                         read_pop(ma);
 425                 }
 426
 427                 return 1;
 428         }
 429
 430 #ifdef DEBUG_READ
 431         (void) fprintf(el->el_errfile, "Turning raw mode on\n");
 432 #endif /* DEBUG_READ */
 433         if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
 434                 return 0;
 435
 436 #ifdef DEBUG_READ
 437         (void) fprintf(el->el_errfile, "Reading a character\n");
 438 #endif /* DEBUG_READ */
 439         num_read = (*el->el_read.read_char)(el, cp);
 440         if (num_read < 0)
 441                 el->el_errno = errno;
 442 #ifdef WIDECHAR
 443         if (el->el_flags & NARROW_READ)
 444                 *cp = *(char *)(void *)cp;
 445 #endif
 446 #ifdef DEBUG_READ
 447         (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
 448 #endif /* DEBUG_READ */
 449         return num_read;
 450 }
 451
 452 protected void
 453 read_prepare(EditLine *el)
 454 {
 455         if (el->el_flags & HANDLE_SIGNALS)
 456                 sig_set(el);
 457         if (el->el_flags & NO_TTY)
 458                 return;
 459         if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
 460                 tty_rawmode(el);
 461
 462         /* This is relatively cheap, and things go terribly wrong if
 463            we have the wrong size. */
 464         el_resize(el);
 465         re_clear_display(el);   /* reset the display stuff */
 466         ch_reset(el, 0);
 467         re_refresh(el);         /* print the prompt */
 468
 469         if (el->el_flags & UNBUFFERED)
 470                 terminal__flush(el);
 471 }
 472
 473 protected void
 474 read_finish(EditLine *el)
 475 {
 476         if ((el->el_flags & UNBUFFERED) == 0)
 477                 (void) tty_cookedmode(el);
 478         if (el->el_flags & HANDLE_SIGNALS)
 479                 sig_clr(el);
 480 }
 481
 482 public const Char *
 483 FUN(el,gets)(EditLine *el, int *nread)
 484 {
 485         int retval;
 486         el_action_t cmdnum = 0;
 487         int num;                /* how many chars we have read at NL */
 488         Char ch, *cp;
 489         int crlf = 0;
 490         int nrb;
 491 #ifdef FIONREAD
 492         c_macro_t *ma = &el->el_chared.c_macro;
 493 #endif /* FIONREAD */
 494
 495         if (nread == NULL)
 496                 nread = &nrb;
 497         *nread = 0;
 498
 499         if (el->el_flags & NO_TTY) {
 500                 size_t idx;
 501
 502                 cp = el->el_line.buffer;
 503                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 504                         /* make sure there is space for next character */
 505                         if (cp + 1 >= el->el_line.limit) {
 506                                 idx = (size_t)(cp - el->el_line.buffer);
 507                                 if (!ch_enlargebufs(el, (size_t)2))
 508                                         break;
 509                                 cp = &el->el_line.buffer[idx];
 510                         }
 511                         cp++;
 512                         if (el->el_flags & UNBUFFERED)
 513                                 break;
 514                         if (cp[-1] == '\r' || cp[-1] == '\n')
 515                                 break;
 516                 }
 517                 if (num == -1) {
 518                         if (errno == EINTR)
 519                                 cp = el->el_line.buffer;
 520                         el->el_errno = errno;
 521                 }
 522
 523                 goto noedit;
 524         }
 525
 526
 527 #ifdef FIONREAD
 528         if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
 529                 long chrs = 0;
 530
 531                 (void) ioctl(el->el_infd, FIONREAD, &chrs);
 532                 if (chrs == 0) {
 533                         if (tty_rawmode(el) < 0) {
 534                                 errno = 0;
 535                                 *nread = 0;
 536                                 return NULL;
 537                         }
 538                 }
 539         }
 540 #endif /* FIONREAD */
 541
 542         if ((el->el_flags & UNBUFFERED) == 0)
 543                 read_prepare(el);
 544
 545         if (el->el_flags & EDIT_DISABLED) {
 546                 size_t idx;
 547
 548                 if ((el->el_flags & UNBUFFERED) == 0)
 549                         cp = el->el_line.buffer;
 550                 else
 551                         cp = el->el_line.lastchar;
 552
 553                 terminal__flush(el);
 554
 555                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 556                         /* make sure there is space next character */
 557                         if (cp + 1 >= el->el_line.limit) {
 558                                 idx = (size_t)(cp - el->el_line.buffer);
 559                                 if (!ch_enlargebufs(el, (size_t)2))
 560                                         break;
 561                                 cp = &el->el_line.buffer[idx];
 562                         }
 563                         cp++;
 564                         crlf = cp[-1] == '\r' || cp[-1] == '\n';
 565                         if (el->el_flags & UNBUFFERED)
 566                                 break;
 567                         if (crlf)
 568                                 break;
 569                 }
 570
 571                 if (num == -1) {
 572                         if (errno == EINTR)
 573                                 cp = el->el_line.buffer;
 574                         el->el_errno = errno;
 575                 }
 576
 577                 goto noedit;
 578         }
 579
 580         for (num = OKCMD; num == OKCMD;) {      /* while still editing this
 581                                                  * line */
 582 #ifdef DEBUG_EDIT
 583                 read_debug(el);
 584 #endif /* DEBUG_EDIT */
 585                 /* if EOF or error */
 586                 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
 587                         num = -1;
 588 #ifdef DEBUG_READ
 589                         (void) fprintf(el->el_errfile,
 590                             "Returning from el_gets %d\n", num);
 591 #endif /* DEBUG_READ */
 592                         break;
 593                 }
 594                 if (el->el_errno == EINTR) {
 595                         el->el_line.buffer[0] = '\0';
 596                         el->el_line.lastchar =
 597                             el->el_line.cursor = el->el_line.buffer;
 598                         break;
 599                 }
 600                 if ((size_t)cmdnum >= el->el_map.nfunc) {       /* BUG CHECK command */
 601 #ifdef DEBUG_EDIT
 602                         (void) fprintf(el->el_errfile,
 603                             "ERROR: illegal command from key 0%o\r\n", ch);
 604 #endif /* DEBUG_EDIT */
 605                         continue;       /* try again */
 606                 }
 607                 /* now do the real command */
 608 #ifdef DEBUG_READ
 609                 {
 610                         el_bindings_t *b;
 611                         for (b = el->el_map.help; b->name; b++)
 612                                 if (b->func == cmdnum)
 613                                         break;
 614                         if (b->name)
 615                                 (void) fprintf(el->el_errfile,
 616                                     "Executing %s\n", b->name);
 617                         else
 618                                 (void) fprintf(el->el_errfile,
 619                                     "Error command = %d\n", cmdnum);
 620                 }
 621 #endif /* DEBUG_READ */
 622                 /* vi redo needs these way down the levels... */
 623                 el->el_state.thiscmd = cmdnum;
 624                 el->el_state.thisch = ch;
 625                 if (el->el_map.type == MAP_VI &&
 626                     el->el_map.current == el->el_map.key &&
 627                     el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
 628                         if (cmdnum == VI_DELETE_PREV_CHAR &&
 629                             el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
 630                             && Isprint(el->el_chared.c_redo.pos[-1]))
 631                                 el->el_chared.c_redo.pos--;
 632                         else
 633                                 *el->el_chared.c_redo.pos++ = ch;
 634                 }
 635                 retval = (*el->el_map.func[cmdnum]) (el, ch);
 636 #ifdef DEBUG_READ
 637                 (void) fprintf(el->el_errfile,
 638                         "Returned state %d\n", retval );
 639 #endif /* DEBUG_READ */
 640
 641                 /* save the last command here */
 642                 el->el_state.lastcmd = cmdnum;
 643
 644                 /* use any return value */
 645                 switch (retval) {
 646                 case CC_CURSOR:
 647                         re_refresh_cursor(el);
 648                         break;
 649
 650                 case CC_REDISPLAY:
 651                         re_clear_lines(el);
 652                         re_clear_display(el);
 653                         /* FALLTHROUGH */
 654
 655                 case CC_REFRESH:
 656                         re_refresh(el);
 657                         break;
 658
 659                 case CC_REFRESH_BEEP:
 660                         re_refresh(el);
 661                         terminal_beep(el);
 662                         break;
 663
 664                 case CC_NORM:   /* normal char */
 665                         break;
 666
 667                 case CC_ARGHACK:        /* Suggested by Rich Salz */
 668                         /* <rsalz@pineapple.bbn.com> */
 669                         continue;       /* keep going... */
 670
 671                 case CC_EOF:    /* end of file typed */
 672                         if ((el->el_flags & UNBUFFERED) == 0)
 673                                 num = 0;
 674                         else if (num == -1) {
 675                                 *el->el_line.lastchar++ = CONTROL('d');
 676                                 el->el_line.cursor = el->el_line.lastchar;
 677                                 num = 1;
 678                         }
 679                         break;
 680
 681                 case CC_NEWLINE:        /* normal end of line */
 682                         num = (int)(el->el_line.lastchar - el->el_line.buffer);
 683                         break;
 684
 685                 case CC_FATAL:  /* fatal error, reset to known state */
 686 #ifdef DEBUG_READ
 687                         (void) fprintf(el->el_errfile,
 688                             "*** editor fatal ERROR ***\r\n\n");
 689 #endif /* DEBUG_READ */
 690                         /* put (real) cursor in a known place */
 691                         re_clear_display(el);   /* reset the display stuff */
 692                         ch_reset(el, 1);        /* reset the input pointers */
 693                         re_refresh(el); /* print the prompt again */
 694                         break;
 695
 696                 case CC_ERROR:
 697                 default:        /* functions we don't know about */
 698 #ifdef DEBUG_READ
 699                         (void) fprintf(el->el_errfile,
 700                             "*** editor ERROR ***\r\n\n");
 701 #endif /* DEBUG_READ */
 702                         terminal_beep(el);
 703                         terminal__flush(el);
 704                         break;
 705                 }
 706                 el->el_state.argument = 1;
 707                 el->el_state.doingarg = 0;
 708                 el->el_chared.c_vcmd.action = NOP;
 709                 if (el->el_flags & UNBUFFERED)
 710                         break;
 711         }
 712
 713         terminal__flush(el);            /* flush any buffered output */
 714         /* make sure the tty is set up correctly */
 715         if ((el->el_flags & UNBUFFERED) == 0) {
 716                 read_finish(el);
 717                 *nread = num != -1 ? num : 0;
 718         } else {
 719                 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
 720         }
 721         goto done;
 722 noedit:
 723         el->el_line.cursor = el->el_line.lastchar = cp;
 724         *cp = '\0';
 725         *nread = (int)(el->el_line.cursor - el->el_line.buffer);
 726 done:
 727         if (*nread == 0) {
 728                 if (num == -1) {
 729                         *nread = -1;
 730                         errno = el->el_errno;
 731                 }
 732                 return NULL;
 733         } else
 734                 return el->el_line.buffer;
 735 }