lib/libedit/read.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Christos Zoulas of Cornell University.
   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  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      $NetBSD: read.c,v 1.52 2009/07/22 15:57:00 christos Exp $
  33  */
  34
  35 #if !defined(lint) && !defined(SCCSID)
  36 static char sccsid[] = "@(#)read.c      8.1 (Berkeley) 6/4/93";
  37 #endif /* not lint && not SCCSID */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 /*
  42  * read.c: Clean this junk up! This is horrible code.
  43  *         Terminal read functions
  44  */
  45 #include "sys.h"
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <unistd.h>
  49 #include <stdlib.h>
  50 #include "el.h"
  51
  52 #define OKCMD   -1
  53
  54 private int     read__fixio(int, int);
  55 private int     read_preread(EditLine *);
  56 private int     read_char(EditLine *, char *);
  57 private int     read_getcmd(EditLine *, el_action_t *, char *);
  58 private void    read_pop(c_macro_t *);
  59
  60 /* read_init():
  61  *      Initialize the read stuff
  62  */
  63 protected int
  64 read_init(EditLine *el)
  65 {
  66         /* builtin read_char */
  67         el->el_read.read_char = read_char;
  68         return 0;
  69 }
  70
  71
  72 /* el_read_setfn():
  73  *      Set the read char function to the one provided.
  74  *      If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
  75  */
  76 protected int
  77 el_read_setfn(EditLine *el, el_rfunc_t rc)
  78 {
  79         el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
  80         return 0;
  81 }
  82
  83
  84 /* el_read_getfn():
  85  *      return the current read char function, or EL_BUILTIN_GETCFN
  86  *      if it is the default one
  87  */
  88 protected el_rfunc_t
  89 el_read_getfn(EditLine *el)
  90 {
  91        return (el->el_read.read_char == read_char) ?
  92             EL_BUILTIN_GETCFN : el->el_read.read_char;
  93 }
  94
  95
  96 #ifndef MIN
  97 #define MIN(A,B) ((A) < (B) ? (A) : (B))
  98 #endif
  99
 100 #ifdef DEBUG_EDIT
 101 private void
 102 read_debug(EditLine *el)
 103 {
 104
 105         if (el->el_line.cursor > el->el_line.lastchar)
 106                 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
 107         if (el->el_line.cursor < el->el_line.buffer)
 108                 (void) fprintf(el->el_errfile, "cursor < buffer\r\n");
 109         if (el->el_line.cursor > el->el_line.limit)
 110                 (void) fprintf(el->el_errfile, "cursor > limit\r\n");
 111         if (el->el_line.lastchar > el->el_line.limit)
 112                 (void) fprintf(el->el_errfile, "lastchar > limit\r\n");
 113         if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
 114                 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
 115 }
 116 #endif /* DEBUG_EDIT */
 117
 118
 119 /* read__fixio():
 120  *      Try to recover from a read error
 121  */
 122 /* ARGSUSED */
 123 private int
 124 read__fixio(int fd __unused, int e)
 125 {
 126
 127         switch (e) {
 128         case -1:                /* Make sure that the code is reachable */
 129
 130 #ifdef EWOULDBLOCK
 131         case EWOULDBLOCK:
 132 #ifndef TRY_AGAIN
 133 #define TRY_AGAIN
 134 #endif
 135 #endif /* EWOULDBLOCK */
 136
 137 #if defined(POSIX) && defined(EAGAIN)
 138 #if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
 139         case EAGAIN:
 140 #ifndef TRY_AGAIN
 141 #define TRY_AGAIN
 142 #endif
 143 #endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
 144 #endif /* POSIX && EAGAIN */
 145
 146                 e = 0;
 147 #ifdef TRY_AGAIN
 148 #if defined(F_SETFL) && defined(O_NDELAY)
 149                 if ((e = fcntl(fd, F_GETFL, 0)) == -1)
 150                         return (-1);
 151
 152                 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
 153                         return (-1);
 154                 else
 155                         e = 1;
 156 #endif /* F_SETFL && O_NDELAY */
 157
 158 #ifdef FIONBIO
 159                 {
 160                         int zero = 0;
 161
 162                         if (ioctl(fd, FIONBIO, (ioctl_t) & zero) == -1)
 163                                 return (-1);
 164                         else
 165                                 e = 1;
 166                 }
 167 #endif /* FIONBIO */
 168
 169 #endif /* TRY_AGAIN */
 170                 return (e ? 0 : -1);
 171
 172         case EINTR:
 173                 return (0);
 174
 175         default:
 176                 return (-1);
 177         }
 178 }
 179
 180
 181 /* read_preread():
 182  *      Try to read the stuff in the input queue;
 183  */
 184 private int
 185 read_preread(EditLine *el)
 186 {
 187         int chrs = 0;
 188
 189         if (el->el_tty.t_mode == ED_IO)
 190                 return (0);
 191
 192 #ifdef FIONREAD
 193         (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
 194         if (chrs > 0) {
 195                 char buf[EL_BUFSIZ];
 196
 197                 chrs = read(el->el_infd, buf,
 198                     (size_t) MIN(chrs, EL_BUFSIZ - 1));
 199                 if (chrs > 0) {
 200                         buf[chrs] = '\0';
 201                         el_push(el, buf);
 202                 }
 203         }
 204 #endif /* FIONREAD */
 205
 206         return (chrs > 0);
 207 }
 208
 209
 210 /* el_push():
 211  *      Push a macro
 212  */
 213 public void
 214 el_push(EditLine *el, const char *str)
 215 {
 216         c_macro_t *ma = &el->el_chared.c_macro;
 217
 218         if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
 219                 ma->level++;
 220                 if ((ma->macro[ma->level] = el_strdup(str)) != NULL)
 221                         return;
 222                 ma->level--;
 223         }
 224         term_beep(el);
 225         term__flush(el);
 226 }
 227
 228
 229 /* read_getcmd():
 230  *      Return next command from the input stream.
 231  */
 232 private int
 233 read_getcmd(EditLine *el, el_action_t *cmdnum, char *ch)
 234 {
 235         el_action_t cmd;
 236         int num;
 237
 238         el->el_errno = 0;
 239         do {
 240                 if ((num = el_getc(el, ch)) != 1) {     /* if EOF or error */
 241                         el->el_errno = num == 0 ? 0 : errno;
 242                         return (num);
 243                 }
 244
 245 #ifdef  KANJI
 246                 if ((*ch & 0200)) {
 247                         el->el_state.metanext = 0;
 248                         cmd = CcViMap[' '];
 249                         break;
 250                 } else
 251 #endif /* KANJI */
 252
 253                 if (el->el_state.metanext) {
 254                         el->el_state.metanext = 0;
 255                         *ch |= 0200;
 256                 }
 257                 cmd = el->el_map.current[(unsigned char) *ch];
 258                 if (cmd == ED_SEQUENCE_LEAD_IN) {
 259                         key_value_t val;
 260                         switch (key_get(el, ch, &val)) {
 261                         case XK_CMD:
 262                                 cmd = val.cmd;
 263                                 break;
 264                         case XK_STR:
 265                                 el_push(el, val.str);
 266                                 break;
 267 #ifdef notyet
 268                         case XK_EXE:
 269                                 /* XXX: In the future to run a user function */
 270                                 RunCommand(val.str);
 271                                 break;
 272 #endif
 273                         default:
 274                                 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
 275                                 break;
 276                         }
 277                 }
 278                 if (el->el_map.alt == NULL)
 279                         el->el_map.current = el->el_map.key;
 280         } while (cmd == ED_SEQUENCE_LEAD_IN);
 281         *cmdnum = cmd;
 282         return (OKCMD);
 283 }
 284
 285
 286 /* read_char():
 287  *      Read a character from the tty.
 288  */
 289 private int
 290 read_char(EditLine *el, char *cp)
 291 {
 292         ssize_t num_read;
 293         int tried = 0;
 294
 295  again:
 296         el->el_signal->sig_no = 0;
 297         while ((num_read = read(el->el_infd, cp, 1)) == -1) {
 298                 if (el->el_signal->sig_no == SIGCONT) {
 299                         sig_set(el);
 300                         el_set(el, EL_REFRESH);
 301                         goto again;
 302                 }
 303                 if (!tried && read__fixio(el->el_infd, errno) == 0)
 304                         tried = 1;
 305                 else {
 306                         *cp = '\0';
 307                         return (-1);
 308                 }
 309         }
 310         return (int)num_read;
 311 }
 312
 313 /* read_pop():
 314  *      Pop a macro from the stack
 315  */
 316 private void
 317 read_pop(c_macro_t *ma)
 318 {
 319         int i;
 320
 321         el_free(ma->macro[0]);
 322         for (i = 0; i < ma->level; i++)
 323                 ma->macro[i] = ma->macro[i + 1];
 324         ma->level--;
 325         ma->offset = 0;
 326 }
 327
 328 /* el_getc():
 329  *      Read a character
 330  */
 331 public int
 332 el_getc(EditLine *el, char *cp)
 333 {
 334         int num_read;
 335         c_macro_t *ma = &el->el_chared.c_macro;
 336
 337         term__flush(el);
 338         for (;;) {
 339                 if (ma->level < 0) {
 340                         if (!read_preread(el))
 341                                 break;
 342                 }
 343
 344                 if (ma->level < 0)
 345                         break;
 346
 347                 if (ma->macro[0][ma->offset] == '\0') {
 348                         read_pop(ma);
 349                         continue;
 350                 }
 351
 352                 *cp = ma->macro[0][ma->offset++] & 0377;
 353
 354                 if (ma->macro[0][ma->offset] == '\0') {
 355                         /* Needed for QuoteMode On */
 356                         read_pop(ma);
 357                 }
 358
 359                 return (1);
 360         }
 361
 362 #ifdef DEBUG_READ
 363         (void) fprintf(el->el_errfile, "Turning raw mode on\n");
 364 #endif /* DEBUG_READ */
 365         if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
 366                 return (0);
 367
 368 #ifdef DEBUG_READ
 369         (void) fprintf(el->el_errfile, "Reading a character\n");
 370 #endif /* DEBUG_READ */
 371         num_read = (*el->el_read.read_char)(el, cp);
 372 #ifdef DEBUG_READ
 373         (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
 374 #endif /* DEBUG_READ */
 375         return (num_read);
 376 }
 377
 378 protected void
 379 read_prepare(EditLine *el)
 380 {
 381         if (el->el_flags & HANDLE_SIGNALS)
 382                 sig_set(el);
 383         if (el->el_flags & NO_TTY)
 384                 return;
 385         if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
 386                 tty_rawmode(el);
 387
 388         /* This is relatively cheap, and things go terribly wrong if
 389            we have the wrong size. */
 390         el_resize(el);
 391         re_clear_display(el);   /* reset the display stuff */
 392         ch_reset(el, 0);
 393         re_refresh(el);         /* print the prompt */
 394
 395         if (el->el_flags & UNBUFFERED)
 396                 term__flush(el);
 397 }
 398
 399 protected void
 400 read_finish(EditLine *el)
 401 {
 402         if ((el->el_flags & UNBUFFERED) == 0)
 403                 (void) tty_cookedmode(el);
 404         if (el->el_flags & HANDLE_SIGNALS)
 405                 sig_clr(el);
 406 }
 407
 408 public const char *
 409 el_gets(EditLine *el, int *nread)
 410 {
 411         int retval;
 412         el_action_t cmdnum = 0;
 413         int num;                /* how many chars we have read at NL */
 414         char ch;
 415         int crlf = 0;
 416         int nrb;
 417 #ifdef FIONREAD
 418         c_macro_t *ma = &el->el_chared.c_macro;
 419 #endif /* FIONREAD */
 420
 421         if (nread == NULL)
 422                 nread = &nrb;
 423         *nread = 0;
 424
 425         if (el->el_flags & NO_TTY) {
 426                 char *cp = el->el_line.buffer;
 427                 size_t idx;
 428
 429                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 430                         /* make sure there is space for next character */
 431                         if (cp + 1 >= el->el_line.limit) {
 432                                 idx = (cp - el->el_line.buffer);
 433                                 if (!ch_enlargebufs(el, 2))
 434                                         break;
 435                                 cp = &el->el_line.buffer[idx];
 436                         }
 437                         cp++;
 438                         if (el->el_flags & UNBUFFERED)
 439                                 break;
 440                         if (cp[-1] == '\r' || cp[-1] == '\n')
 441                                 break;
 442                 }
 443                 if (num == -1)
 444                         el->el_errno = errno;
 445
 446                 el->el_line.cursor = el->el_line.lastchar = cp;
 447                 *cp = '\0';
 448                 *nread = (int)(el->el_line.cursor - el->el_line.buffer);
 449                 goto done;
 450         }
 451
 452
 453 #ifdef FIONREAD
 454         if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
 455                 long chrs = 0;
 456
 457                 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
 458                 if (chrs == 0) {
 459                         if (tty_rawmode(el) < 0) {
 460                                 errno = 0;
 461                                 *nread = 0;
 462                                 return (NULL);
 463                         }
 464                 }
 465         }
 466 #endif /* FIONREAD */
 467
 468         if ((el->el_flags & UNBUFFERED) == 0)
 469                 read_prepare(el);
 470
 471         if (el->el_flags & EDIT_DISABLED) {
 472                 char *cp;
 473                 size_t idx;
 474
 475                 if ((el->el_flags & UNBUFFERED) == 0)
 476                         cp = el->el_line.buffer;
 477                 else
 478                         cp = el->el_line.lastchar;
 479
 480                 term__flush(el);
 481
 482                 while ((num = (*el->el_read.read_char)(el, cp)) == 1) {
 483                         /* make sure there is space next character */
 484                         if (cp + 1 >= el->el_line.limit) {
 485                                 idx = (cp - el->el_line.buffer);
 486                                 if (!ch_enlargebufs(el, 2))
 487                                         break;
 488                                 cp = &el->el_line.buffer[idx];
 489                         }
 490                         cp++;
 491                         crlf = cp[-1] == '\r' || cp[-1] == '\n';
 492                         if (el->el_flags & UNBUFFERED)
 493                                 break;
 494                         if (crlf)
 495                                 break;
 496                 }
 497
 498                 if (num == -1) {
 499                         el->el_errno = errno;
 500                 }
 501
 502                 el->el_line.cursor = el->el_line.lastchar = cp;
 503                 *cp = '\0';
 504                 goto done;
 505         }
 506
 507         for (num = OKCMD; num == OKCMD;) {      /* while still editing this
 508                                                  * line */
 509 #ifdef DEBUG_EDIT
 510                 read_debug(el);
 511 #endif /* DEBUG_EDIT */
 512                 /* if EOF or error */
 513                 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
 514 #ifdef DEBUG_READ
 515                         (void) fprintf(el->el_errfile,
 516                             "Returning from el_gets %d\n", num);
 517 #endif /* DEBUG_READ */
 518                         break;
 519                 }
 520                 if ((unsigned int)cmdnum >= (unsigned int)el->el_map.nfunc) {   /* BUG CHECK command */
 521 #ifdef DEBUG_EDIT
 522                         (void) fprintf(el->el_errfile,
 523                             "ERROR: illegal command from key 0%o\r\n", ch);
 524 #endif /* DEBUG_EDIT */
 525                         continue;       /* try again */
 526                 }
 527                 /* now do the real command */
 528 #ifdef DEBUG_READ
 529                 {
 530                         el_bindings_t *b;
 531                         for (b = el->el_map.help; b->name; b++)
 532                                 if (b->func == cmdnum)
 533                                         break;
 534                         if (b->name)
 535                                 (void) fprintf(el->el_errfile,
 536                                     "Executing %s\n", b->name);
 537                         else
 538                                 (void) fprintf(el->el_errfile,
 539                                     "Error command = %d\n", cmdnum);
 540                 }
 541 #endif /* DEBUG_READ */
 542                 /* vi redo needs these way down the levels... */
 543                 el->el_state.thiscmd = cmdnum;
 544                 el->el_state.thisch = ch;
 545                 if (el->el_map.type == MAP_VI &&
 546                     el->el_map.current == el->el_map.key &&
 547                     el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
 548                         if (cmdnum == VI_DELETE_PREV_CHAR &&
 549                             el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
 550                             && isprint((unsigned char)el->el_chared.c_redo.pos[-1]))
 551                                 el->el_chared.c_redo.pos--;
 552                         else
 553                                 *el->el_chared.c_redo.pos++ = ch;
 554                 }
 555                 retval = (*el->el_map.func[cmdnum]) (el, ch);
 556 #ifdef DEBUG_READ
 557                 (void) fprintf(el->el_errfile,
 558                         "Returned state %d\n", retval );
 559 #endif /* DEBUG_READ */
 560
 561                 /* save the last command here */
 562                 el->el_state.lastcmd = cmdnum;
 563
 564                 /* use any return value */
 565                 switch (retval) {
 566                 case CC_CURSOR:
 567                         re_refresh_cursor(el);
 568                         break;
 569
 570                 case CC_REDISPLAY:
 571                         re_clear_lines(el);
 572                         re_clear_display(el);
 573                         /* FALLTHROUGH */
 574
 575                 case CC_REFRESH:
 576                         re_refresh(el);
 577                         break;
 578
 579                 case CC_REFRESH_BEEP:
 580                         re_refresh(el);
 581                         term_beep(el);
 582                         break;
 583
 584                 case CC_NORM:   /* normal char */
 585                         break;
 586
 587                 case CC_ARGHACK:        /* Suggested by Rich Salz */
 588                         /* <rsalz@pineapple.bbn.com> */
 589                         continue;       /* keep going... */
 590
 591                 case CC_EOF:    /* end of file typed */
 592                         if ((el->el_flags & UNBUFFERED) == 0)
 593                                 num = 0;
 594                         else if (num == -1) {
 595                                 *el->el_line.lastchar++ = CONTROL('d');
 596                                 el->el_line.cursor = el->el_line.lastchar;
 597                                 num = 1;
 598                         }
 599                         break;
 600
 601                 case CC_NEWLINE:        /* normal end of line */
 602                         num = (int)(el->el_line.lastchar - el->el_line.buffer);
 603                         break;
 604
 605                 case CC_FATAL:  /* fatal error, reset to known state */
 606 #ifdef DEBUG_READ
 607                         (void) fprintf(el->el_errfile,
 608                             "*** editor fatal ERROR ***\r\n\n");
 609 #endif /* DEBUG_READ */
 610                         /* put (real) cursor in a known place */
 611                         re_clear_display(el);   /* reset the display stuff */
 612                         ch_reset(el, 1);        /* reset the input pointers */
 613                         re_refresh(el); /* print the prompt again */
 614                         break;
 615
 616                 case CC_ERROR:
 617                 default:        /* functions we don't know about */
 618 #ifdef DEBUG_READ
 619                         (void) fprintf(el->el_errfile,
 620                             "*** editor ERROR ***\r\n\n");
 621 #endif /* DEBUG_READ */
 622                         term_beep(el);
 623                         term__flush(el);
 624                         break;
 625                 }
 626                 el->el_state.argument = 1;
 627                 el->el_state.doingarg = 0;
 628                 el->el_chared.c_vcmd.action = NOP;
 629                 if (el->el_flags & UNBUFFERED)
 630                         break;
 631         }
 632
 633         term__flush(el);                /* flush any buffered output */
 634         /* make sure the tty is set up correctly */
 635         if ((el->el_flags & UNBUFFERED) == 0) {
 636                 read_finish(el);
 637                 *nread = num != -1 ? num : 0;
 638         } else {
 639                 *nread = (int)(el->el_line.lastchar - el->el_line.buffer);
 640         }
 641 done:
 642         if (*nread == 0) {
 643                 if (num == -1) {
 644                         *nread = -1;
 645                         errno = el->el_errno;
 646                 }
 647                 return NULL;
 648         } else
 649                 return el->el_line.buffer;
 650 }