lib/libedit/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 $");
  41 #endif
  42 #endif /* not lint && not SCCSID */
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD$");
  45
  46 /*
  47  * read.c: Clean this junk up! This is horrible code.
  48  *         Terminal read functions
  49  */
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <unistd.h>
  53 #include <stdlib.h>
  54 #include <limits.h>
  55 #include "el.h"
  56
  57 #define OKCMD   -1      /* must be -1! */
  58
  59 private int     read__fixio(int, int);
  60 private int     read_preread(EditLine *);
  61 private int     read_char(EditLine *, Char *);
  62 private int     read_getcmd(EditLine *, el_action_t *, Char *);
  63 private void    read_pop(c_macro_t *);
  64
  65 /* read_init():
  66  *      Initialize the read stuff
  67  */
  68 protected int
  69 read_init(EditLine *el)
  70 {
  71         /* builtin read_char */
  72         el->el_read.read_char = read_char;
  73         return 0;
  74 }
  75
  76
  77 /* el_read_setfn():
  78  *      Set the read char function to the one provided.
  79  *      If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
  80  */
  81 protected int
  82 el_read_setfn(EditLine *el, el_rfunc_t rc)
  83 {
  84         el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
  85         return 0;
  86 }
  87
  88
  89 /* el_read_getfn():
  90  *      return the current read char function, or EL_BUILTIN_GETCFN
  91  *      if it is the default one
  92  */
  93 protected el_rfunc_t
  94 el_read_getfn(EditLine *el)
  95 {
  96        return el->el_read.read_char == read_char ?
  97             EL_BUILTIN_GETCFN : el->el_read.read_char;
  98 }
  99
 100
 101 #ifndef MIN
 102 #define MIN(A,B) ((A) < (B) ? (A) : (B))
 103 #endif
 104
 105 #ifdef DEBUG_EDIT
 106 private void
 107 read_debug(EditLine *el)
 108 {
 109
 110         if (el->el_line.cursor > el->el_line.lastchar)
 111                 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
 112         if (el->el_line.cursor < el->el_line.buffer)
 113                 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
 114         if (el->el_line.cursor > el->el_line.limit)
 115                 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
 116         if (el->el_line.lastchar > el->el_line.limit)
 117                 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
 118         if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
 119                 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
 120 }
 121 #endif /* DEBUG_EDIT */
 122
 123
 124 /* read__fixio():
 125  *      Try to recover from a read error
 126  */
 127 /* ARGSUSED */
 128 private int
 129 read__fixio(int fd __attribute__((__unused__)), int e)
 130 {
 131
 132         switch (e) {
 133         case -1:                /* Make sure that the code is reachable */
 134
 135 #ifdef EWOULDBLOCK
 136         case EWOULDBLOCK:
 137 #ifndef TRY_AGAIN
 138 #define TRY_AGAIN
 139 #endif
 140 #endif /* EWOULDBLOCK */
 141
 142 #if defined(POSIX) && defined(EAGAIN)
 143 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
 144         case EAGAIN:
 145 #ifndef TRY_AGAIN
 146 #define TRY_AGAIN
 147 #endif
 148 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
 149 #endif /* POSIX && EAGAIN */
 150
 151                 e = 0;
 152 #ifdef TRY_AGAIN
 153 #if defined(F_SETFL) && defined(O_NDELAY)
 154                 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
 155                         return -1;
 156
 157                 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
 158                         return -1;
 159                 else
 160                         e = 1;
 161 #endif /* F_SETFL && O_NDELAY */
 162
 163 #ifdef FIONBIO
 164                 {
 165                         int zero = 0;
 166
 167                         if (ioctl(fd, FIONBIO, &zero) == -1)
 168                                 return -1;
 169                         else
 170                                 e = 1;
 171                 }
 172 #endif /* FIONBIO */
 173
 174 #endif /* TRY_AGAIN */
 175                 return e ? 0 : -1;
 176
 177         case EINTR:
 178                 return 0;
 179
 180         default:
 181                 return -1;
 182         }
 183 }
 184
 185
 186 /* read_preread():
 187  *      Try to read the stuff in the input queue;
 188  */
 189 private int
 190 read_preread(EditLine *el)
 191 {
 192         int chrs = 0;
 193
 194         if (el->el_tty.t_mode == ED_IO)
 195                 return 0;
 196
 197 #ifndef WIDECHAR
 198 /* FIONREAD attempts to buffer up multiple bytes, and to make that work
 199  * properly with partial wide/UTF-8 characters would need some careful work. */
 200 #ifdef FIONREAD
 201         (void) ioctl(el->el_infd, FIONREAD, &chrs);
 202         if (chrs > 0) {
 203                 char buf[EL_BUFSIZ];
 204
 205                 chrs = read(el->el_infd, buf,
 206                     (size_t) MIN(chrs, EL_BUFSIZ - 1));
 207                 if (chrs > 0) {
 208                         buf[chrs] = '\0';
 209                         el_push(el, buf);
 210                 }
 211         }
 212 #endif /* FIONREAD */
 213 #endif
 214         return chrs > 0;
 215 }
 216
 217
 218 /* el_push():
 219  *      Push a macro
 220  */
 221 public void
 222 FUN(el,push)(EditLine *el, const Char *str)
 223 {
 224         c_macro_t *ma = &el->el_chared.c_macro;
 225
 226         if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
 227                 ma->level++;
 228                 if ((ma->macro[ma->level] = Strdup(str)) != NULL)
 229                         return;
 230                 ma->level--;
 231         }
 232         terminal_beep(el);
 233         terminal__flush(el);
 234 }
 235
 236
 237 /* read_getcmd():
 238  *      Get next command from the input stream, return OKCMD on success.
 239  *      Character values > 255 are not looked up in the map, but inserted.
 240  */
 241 private int
 242 read_getcmd(EditLine *el, el_action_t *cmdnum, Char *ch)
 243 {
 244         el_action_t cmd;
 245         int num;
 246
 247         el->el_errno = 0;
 248         do {
 249                 if ((num = FUN(el,getc)(el, ch)) != 1) {/* if EOF or error */
 250                         el->el_errno = num == 0 ? 0 : errno;
 251                         return 0;       /* not OKCMD */
 252                 }
 253
 254 #ifdef  KANJI
 255                 if ((*ch & 0200)) {
 256                         el->el_state.metanext = 0;
 257                         cmd = CcViMap[' '];
 258                         break;
 259                 } else
 260 #endif /* KANJI */
 261
 262                 if (el->el_state.metanext) {
 263                         el->el_state.metanext = 0;
 264                         *ch |= 0200;
 265                 }
 266 #ifdef WIDECHAR
 267                 if (*ch >= N_KEYS)
 268                         cmd = ED_INSERT;
 269                 else
 270 #endif
 271                         cmd = el->el_map.current[(unsigned char) *ch];
 272                 if (cmd == ED_SEQUENCE_LEAD_IN) {
 273                         keymacro_value_t val;
 274                         switch (keymacro_get(el, ch, &val)) {
 275                         case XK_CMD:
 276                                 cmd = val.cmd;
 277                                 break;
 278                         case XK_STR:
 279                                 FUN(el,push)(el, val.str);
 280                                 break;
 281 #ifdef notyet
 282                         case XK_EXE:
 283                                 /* XXX: In the future to run a user function */
 284                                 RunCommand(val.str);
 285                                 break;
 286 #endif
 287                         default:
 288                                 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
 289                                 break;
 290                         }
 291                 }
 292                 if (el->el_map.alt == NULL)
 293                         el->el_map.current = el->el_map.key;
 294         } while (cmd == ED_SEQUENCE_LEAD_IN);
 295         *cmdnum = cmd;
 296         return OKCMD;
 297 }
 298
 299 #ifdef WIDECHAR
 300 /* utf8_islead():
 301  *      Test whether a byte is a leading byte of a UTF-8 sequence.
 302  */
 303 private int
 304 utf8_islead(int c)
 305 {
 306         return c < 0x80 ||             /* single byte char */
 307                (c >= 0xc2 && c <= 0xf4); /* start of multibyte sequence */
 308 }
 309 #endif
 310
 311 /* read_char():
 312  *      Read a character from the tty.
 313  */
 314 private int
 315 read_char(EditLine *el, Char *cp)
 316 {
 317         ssize_t num_read;
 318         int tried = 0;
 319         char cbuf[MB_LEN_MAX];
 320         size_t cbp = 0;
 321         int bytes = 0;
 322
 323  again:
 324         el->el_signal->sig_no = 0;
 325         while ((num_read = read(el->el_infd, cbuf + cbp, (size_t)1)) == -1) {
 326                 int e = errno;
 327                 switch (el->el_signal->sig_no) {
 328                 case SIGCONT:
 329                         FUN(el,set)(el, EL_REFRESH);
 330                         /*FALLTHROUGH*/
 331                 case SIGWINCH:
 332                         sig_set(el);
 333                         goto again;
 334                 default:
 335                         break;
 336                 }
 337                 if (!tried && read__fixio(el->el_infd, e) == 0)
 338                         tried = 1;
 339                 else {
 340                         errno = e;
 341                         *cp = '\0';
 342                         return -1;
 343                 }
 344         }
 345
 346         /* Test for EOF */
 347         if (num_read == 0) {
 348                 errno = 0;
 349                 *cp = '\0';
 350                 return 0;
 351         }
 352
 353 #ifdef WIDECHAR
 354         if (el->el_flags & CHARSET_IS_UTF8) {
 355                 if (!utf8_islead((unsigned char)cbuf[0]))
 356                         goto again; /* discard the byte we read and try again */
 357                 ++cbp;
 358                 if ((bytes = ct_mbtowc(cp, cbuf, cbp)) == -1) {
 359                         ct_mbtowc_reset;
 360                         if (cbp >= MB_LEN_MAX) { /* "shouldn't happen" */
 361                                 errno = EILSEQ;
 362                                 *cp = '\0';
 363                                 return -1;
 364                         }
 365                         goto again;
 366                 }
 367         } else if (isascii((unsigned char)cbuf[0]) ||
 368                 /* we don't support other multibyte charsets */
 369                 ++cbp != 1 ||
 370                 /* Try non-ASCII characters in a 8-bit character set */
 371                 (bytes = ct_mbtowc(cp, cbuf, cbp)) != 1)
 372 #endif
 373                 *cp = (unsigned char)cbuf[0];
 374
 375         if ((el->el_flags & IGNORE_EXTCHARS) && bytes > 1) {
 376                 cbp = 0; /* skip this character */
 377                 goto again;
 378         }
 379
 380         return (int)num_read;
 381 }
 382
 383 /* read_pop():
 384  *      Pop a macro from the stack
 385  */
 386 private void
 387 read_pop(c_macro_t *ma)
 388 {
 389         int i;
 390
 391         el_free(ma->macro[0]);
 392         for (i = 0; i < ma->level; i++)
 393                 ma->macro[i] = ma->macro[i + 1];
 394         ma->level--;
 395         ma->offset = 0;
 396 }
 397
 398 /* el_getc():
 399  *      Read a character
 400  */
 401 public int
 402 FUN(el,getc)(EditLine *el, Char *cp)
 403 {
 404         int num_read;
 405         c_macro_t *ma = &el->el_chared.c_macro;
 406
 407         terminal__flush(el);
 408         for (;;) {
 409                 if (ma->level < 0) {
 410                         if (!read_preread(el))
 411                                 break;
 412                 }
 413
 414                 if (ma->level < 0)
 415                         break;
 416
 417                 if (ma->macro[0][ma->offset] == '\0') {
 418                         read_pop(ma);
 419                         continue;
 420                 }
 421
 422                 *cp = ma->macro[0][ma->offset++];
 423
 424                 if (ma->macro[0][ma->offset] == '\0') {
 425                         /* Needed for QuoteMode On */
 426                         read_pop(ma);
 427                 }
 428
 429                 return 1;
 430         }
 431
 432 #ifdef DEBUG_READ
 433         (void) fprintf(el->el_errfile, "Turning raw mode on\n");
 434 #endif /* DEBUG_READ */
 435         if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
 436                 return 0;
 437
 438 #ifdef DEBUG_READ
 439         (void) fprintf(el->el_errfile, "Reading a character\n");
 440 #endif /* DEBUG_READ */
 441         num_read = (*el->el_read.read_char)(el, cp);
 442         if (num_read < 0)
 443                 el->el_errno = errno;
 444 #ifdef WIDECHAR
 445         if (el->el_flags & NARROW_READ)
 446                 *cp = *(char *)(void *)cp;
 447 #endif
 448 #ifdef DEBUG_READ
 449         (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
 450 #endif /* DEBUG_READ */
 451         return num_read;
 452 }
 453
 454 protected void
 455 read_prepare(EditLine *el)
 456 {
 457         if (el->el_flags & HANDLE_SIGNALS)
 458                 sig_set(el);
 459         if (el->el_flags & NO_TTY)
 460                 return;
 461         if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
 462                 tty_rawmode(el);
 463
 464         /* This is relatively cheap, and things go terribly wrong if
 465            we have the wrong size. */
 466         el_resize(el);
 467         re_clear_display(el);   /* reset the display stuff */
 468         ch_reset(el, 0);
 469         re_refresh(el);         /* print the prompt */
 470
 471         if (el->el_flags & UNBUFFERED)
 472                 terminal__flush(el);
 473 }
 474
 475 protected void
 476 read_finish(EditLine *el)
 477 {
 478         if ((el->el_flags & UNBUFFERED) == 0)
 479                 (void) tty_cookedmode(el);
 480         if (el->el_flags & HANDLE_SIGNALS)
 481                 sig_clr(el);
 482 }
 483
 484 public const Char *
 485 FUN(el,gets)(EditLine *el, int *nread)
 486 {
 487         int retval;
 488         el_action_t cmdnum = 0;
 489         int num;                /* how many chars we have read at NL */
 490         Char ch, *cp;
 491         int crlf = 0;
 492         int nrb;
 493 #ifdef FIONREAD
 494         c_macro_t *ma = &el->el_chared.c_macro;
 495 #endif /* FIONREAD */
 496
 497         if (nread == NULL)
 498                 nread = &nrb;
 499         *nread = 0;
 500
 501         if (el->el_flags & NO_TTY) {
 502                 size_t idx;
 503
 504                 cp = el->el_line.buffer;
 505                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 506                         /* make sure there is space for next character */
 507                         if (cp + 1 >= el->el_line.limit) {
 508                                 idx = (size_t)(cp - el->el_line.buffer);
 509                                 if (!ch_enlargebufs(el, (size_t)2))
 510                                         break;
 511                                 cp = &el->el_line.buffer[idx];
 512                         }
 513                         cp++;
 514                         if (el->el_flags & UNBUFFERED)
 515                                 break;
 516                         if (cp[-1] == '\r' || cp[-1] == '\n')
 517                                 break;
 518                 }
 519                 if (num == -1) {
 520                         if (errno == EINTR)
 521                                 cp = el->el_line.buffer;
 522                         el->el_errno = errno;
 523                 }
 524
 525                 goto noedit;
 526         }
 527
 528
 529 #ifdef FIONREAD
 530         if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
 531                 long chrs = 0;
 532
 533                 (void) ioctl(el->el_infd, FIONREAD, &chrs);
 534                 if (chrs == 0) {
 535                         if (tty_rawmode(el) < 0) {
 536                                 errno = 0;
 537                                 *nread = 0;
 538                                 return NULL;
 539                         }
 540                 }
 541         }
 542 #endif /* FIONREAD */
 543
 544         if ((el->el_flags & UNBUFFERED) == 0)
 545                 read_prepare(el);
 546
 547         if (el->el_flags & EDIT_DISABLED) {
 548                 size_t idx;
 549
 550                 if ((el->el_flags & UNBUFFERED) == 0)
 551                         cp = el->el_line.buffer;
 552                 else
 553                         cp = el->el_line.lastchar;
 554
 555                 terminal__flush(el);
 556
 557                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 558                         /* make sure there is space next character */
 559                         if (cp + 1 >= el->el_line.limit) {
 560                                 idx = (size_t)(cp - el->el_line.buffer);
 561                                 if (!ch_enlargebufs(el, (size_t)2))
 562                                         break;
 563                                 cp = &el->el_line.buffer[idx];
 564                         }
 565                         cp++;
 566                         crlf = cp[-1] == '\r' || cp[-1] == '\n';
 567                         if (el->el_flags & UNBUFFERED)
 568                                 break;
 569                         if (crlf)
 570                                 break;
 571                 }
 572
 573                 if (num == -1) {
 574                         if (errno == EINTR)
 575                                 cp = el->el_line.buffer;
 576                         el->el_errno = errno;
 577                 }
 578
 579                 goto noedit;
 580         }
 581
 582         for (num = OKCMD; num == OKCMD;) {      /* while still editing this
 583                                                  * line */
 584 #ifdef DEBUG_EDIT
 585                 read_debug(el);
 586 #endif /* DEBUG_EDIT */
 587                 /* if EOF or error */
 588                 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
 589                         num = -1;
 590 #ifdef DEBUG_READ
 591                         (void) fprintf(el->el_errfile,
 592                             "Returning from el_gets %d\n", num);
 593 #endif /* DEBUG_READ */
 594                         break;
 595                 }
 596                 if (el->el_errno == EINTR) {
 597                         el->el_line.buffer[0] = '\0';
 598                         el->el_line.lastchar =
 599                             el->el_line.cursor = el->el_line.buffer;
 600                         break;
 601                 }
 602                 if ((size_t)cmdnum >= el->el_map.nfunc) {       /* BUG CHECK command */
 603 #ifdef DEBUG_EDIT
 604                         (void) fprintf(el->el_errfile,
 605                             "ERROR: illegal command from key 0%o\r\n", ch);
 606 #endif /* DEBUG_EDIT */
 607                         continue;       /* try again */
 608                 }
 609                 /* now do the real command */
 610 #ifdef DEBUG_READ
 611                 {
 612                         el_bindings_t *b;
 613                         for (b = el->el_map.help; b->name; b++)
 614                                 if (b->func == cmdnum)
 615                                         break;
 616                         if (b->name)
 617                                 (void) fprintf(el->el_errfile,
 618                                     "Executing %s\n", b->name);
 619                         else
 620                                 (void) fprintf(el->el_errfile,
 621                                     "Error command = %d\n", cmdnum);
 622                 }
 623 #endif /* DEBUG_READ */
 624                 /* vi redo needs these way down the levels... */
 625                 el->el_state.thiscmd = cmdnum;
 626                 el->el_state.thisch = ch;
 627                 if (el->el_map.type == MAP_VI &&
 628                     el->el_map.current == el->el_map.key &&
 629                     el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
 630                         if (cmdnum == VI_DELETE_PREV_CHAR &&
 631                             el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
 632                             && Isprint(el->el_chared.c_redo.pos[-1]))
 633                                 el->el_chared.c_redo.pos--;
 634                         else
 635                                 *el->el_chared.c_redo.pos++ = ch;
 636                 }
 637                 retval = (*el->el_map.func[cmdnum]) (el, ch);
 638 #ifdef DEBUG_READ
 639                 (void) fprintf(el->el_errfile,
 640                         "Returned state %d\n", retval );
 641 #endif /* DEBUG_READ */
 642
 643                 /* save the last command here */
 644                 el->el_state.lastcmd = cmdnum;
 645
 646                 /* use any return value */
 647                 switch (retval) {
 648                 case CC_CURSOR:
 649                         re_refresh_cursor(el);
 650                         break;
 651
 652                 case CC_REDISPLAY:
 653                         re_clear_lines(el);
 654                         re_clear_display(el);
 655                         /* FALLTHROUGH */
 656
 657                 case CC_REFRESH:
 658                         re_refresh(el);
 659                         break;
 660
 661                 case CC_REFRESH_BEEP:
 662                         re_refresh(el);
 663                         terminal_beep(el);
 664                         break;
 665
 666                 case CC_NORM:   /* normal char */
 667                         break;
 668
 669                 case CC_ARGHACK:        /* Suggested by Rich Salz */
 670                         /* <rsalz@pineapple.bbn.com> */
 671                         continue;       /* keep going... */
 672
 673                 case CC_EOF:    /* end of file typed */
 674                         if ((el->el_flags & UNBUFFERED) == 0)
 675                                 num = 0;
 676                         else if (num == -1) {
 677                                 *el->el_line.lastchar++ = CONTROL('d');
 678                                 el->el_line.cursor = el->el_line.lastchar;
 679                                 num = 1;
 680                         }
 681                         break;
 682
 683                 case CC_NEWLINE:        /* normal end of line */
 684                         num = (int)(el->el_line.lastchar - el->el_line.buffer);
 685                         break;
 686
 687                 case CC_FATAL:  /* fatal error, reset to known state */
 688 #ifdef DEBUG_READ
 689                         (void) fprintf(el->el_errfile,
 690                             "*** editor fatal ERROR ***\r\n\n");
 691 #endif /* DEBUG_READ */
 692                         /* put (real) cursor in a known place */
 693                         re_clear_display(el);   /* reset the display stuff */
 694                         ch_reset(el, 1);        /* reset the input pointers */
 695                         re_refresh(el); /* print the prompt again */
 696                         break;
 697
 698                 case CC_ERROR:
 699                 default:        /* functions we don't know about */
 700 #ifdef DEBUG_READ
 701                         (void) fprintf(el->el_errfile,
 702                             "*** editor ERROR ***\r\n\n");
 703 #endif /* DEBUG_READ */
 704                         terminal_beep(el);
 705                         terminal__flush(el);
 706                         break;
 707                 }
 708                 el->el_state.argument = 1;
 709                 el->el_state.doingarg = 0;
 710                 el->el_chared.c_vcmd.action = NOP;
 711                 if (el->el_flags & UNBUFFERED)
 712                         break;
 713         }
 714
 715         terminal__flush(el);            /* flush any buffered output */
 716         /* make sure the tty is set up correctly */
 717         if ((el->el_flags & UNBUFFERED) == 0) {
 718                 read_finish(el);
 719                 *nread = num != -1 ? num : 0;
 720         } else {
 721                 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
 722         }
 723         goto done;
 724 noedit:
 725         el->el_line.cursor = el->el_line.lastchar = cp;
 726         *cp = '\0';
 727         *nread = (int)(el->el_line.cursor - el->el_line.buffer);
 728 done:
 729         if (*nread == 0) {
 730                 if (num == -1) {
 731                         *nread = -1;
 732                         errno = el->el_errno;
 733                 }
 734                 return NULL;
 735         } else
 736                 return el->el_line.buffer;
 737 }