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 1.40 2007/03/01 21:41:45 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, 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();
 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         do {
 239                 if ((num = el_getc(el, ch)) != 1)       /* if EOF or error */
 240                         return (num);
 241
 242 #ifdef  KANJI
 243                 if ((*ch & 0200)) {
 244                         el->el_state.metanext = 0;
 245                         cmd = CcViMap[' '];
 246                         break;
 247                 } else
 248 #endif /* KANJI */
 249
 250                 if (el->el_state.metanext) {
 251                         el->el_state.metanext = 0;
 252                         *ch |= 0200;
 253                 }
 254                 cmd = el->el_map.current[(unsigned char) *ch];
 255                 if (cmd == ED_SEQUENCE_LEAD_IN) {
 256                         key_value_t val;
 257                         switch (key_get(el, ch, &val)) {
 258                         case XK_CMD:
 259                                 cmd = val.cmd;
 260                                 break;
 261                         case XK_STR:
 262                                 el_push(el, val.str);
 263                                 break;
 264 #ifdef notyet
 265                         case XK_EXE:
 266                                 /* XXX: In the future to run a user function */
 267                                 RunCommand(val.str);
 268                                 break;
 269 #endif
 270                         default:
 271                                 EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
 272                                 break;
 273                         }
 274                 }
 275                 if (el->el_map.alt == NULL)
 276                         el->el_map.current = el->el_map.key;
 277         } while (cmd == ED_SEQUENCE_LEAD_IN);
 278         *cmdnum = cmd;
 279         return (OKCMD);
 280 }
 281
 282
 283 /* read_char():
 284  *      Read a character from the tty.
 285  */
 286 private int
 287 read_char(EditLine *el, char *cp)
 288 {
 289         int num_read;
 290         int tried = 0;
 291
 292         while ((num_read = read(el->el_infd, cp, 1)) == -1)
 293                 if (!tried && read__fixio(el->el_infd, errno) == 0)
 294                         tried = 1;
 295                 else {
 296                         *cp = '\0';
 297                         return (-1);
 298                 }
 299
 300         return (num_read);
 301 }
 302
 303 /* read_pop():
 304  *      Pop a macro from the stack
 305  */
 306 private void
 307 read_pop(c_macro_t *ma)
 308 {
 309         int i;
 310
 311         el_free(ma->macro[0]);
 312         for (i = ma->level--; i > 0; i--)
 313                 ma->macro[i - 1] = ma->macro[i];
 314         ma->offset = 0;
 315 }
 316
 317 /* el_getc():
 318  *      Read a character
 319  */
 320 public int
 321 el_getc(EditLine *el, char *cp)
 322 {
 323         int num_read;
 324         c_macro_t *ma = &el->el_chared.c_macro;
 325
 326         term__flush();
 327         for (;;) {
 328                 if (ma->level < 0) {
 329                         if (!read_preread(el))
 330                                 break;
 331                 }
 332
 333                 if (ma->level < 0)
 334                         break;
 335
 336                 if (ma->macro[0][ma->offset] == '\0') {
 337                         read_pop(ma);
 338                         continue;
 339                 }
 340
 341                 *cp = ma->macro[0][ma->offset++] & 0377;
 342
 343                 if (ma->macro[0][ma->offset] == '\0') {
 344                         /* Needed for QuoteMode On */
 345                         read_pop(ma);
 346                 }
 347
 348                 return (1);
 349         }
 350
 351 #ifdef DEBUG_READ
 352         (void) fprintf(el->el_errfile, "Turning raw mode on\n");
 353 #endif /* DEBUG_READ */
 354         if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
 355                 return (0);
 356
 357 #ifdef DEBUG_READ
 358         (void) fprintf(el->el_errfile, "Reading a character\n");
 359 #endif /* DEBUG_READ */
 360         num_read = (*el->el_read.read_char)(el, cp);
 361 #ifdef DEBUG_READ
 362         (void) fprintf(el->el_errfile, "Got it %c\n", *cp);
 363 #endif /* DEBUG_READ */
 364         return (num_read);
 365 }
 366
 367 protected void
 368 read_prepare(EditLine *el)
 369 {
 370         if (el->el_flags & HANDLE_SIGNALS)
 371                 sig_set(el);
 372         if (el->el_flags & NO_TTY)
 373                 return;
 374         if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
 375                 tty_rawmode(el);
 376
 377         /* This is relatively cheap, and things go terribly wrong if
 378            we have the wrong size. */
 379         el_resize(el);
 380         re_clear_display(el);   /* reset the display stuff */
 381         ch_reset(el, 0);
 382         re_refresh(el);         /* print the prompt */
 383
 384         if (el->el_flags & UNBUFFERED)
 385                 term__flush();
 386 }
 387
 388 protected void
 389 read_finish(EditLine *el)
 390 {
 391         if ((el->el_flags & UNBUFFERED) == 0)
 392                 (void) tty_cookedmode(el);
 393         if (el->el_flags & HANDLE_SIGNALS)
 394                 sig_clr(el);
 395 }
 396
 397 public const char *
 398 el_gets(EditLine *el, int *nread)
 399 {
 400         int retval;
 401         el_action_t cmdnum = 0;
 402         int num;                /* how many chars we have read at NL */
 403         char ch;
 404         int crlf = 0;
 405 #ifdef FIONREAD
 406         c_macro_t *ma = &el->el_chared.c_macro;
 407 #endif /* FIONREAD */
 408
 409         if (el->el_flags & NO_TTY) {
 410                 char *cp = el->el_line.buffer;
 411                 size_t idx;
 412
 413                 while ((*el->el_read.read_char)(el, cp) == 1) {
 414                         /* make sure there is space for next character */
 415                         if (cp + 1 >= el->el_line.limit) {
 416                                 idx = (cp - el->el_line.buffer);
 417                                 if (!ch_enlargebufs(el, 2))
 418                                         break;
 419                                 cp = &el->el_line.buffer[idx];
 420                         }
 421                         cp++;
 422                         if (el->el_flags & UNBUFFERED)
 423                                 break;
 424                         if (cp[-1] == '\r' || cp[-1] == '\n')
 425                                 break;
 426                 }
 427
 428                 el->el_line.cursor = el->el_line.lastchar = cp;
 429                 *cp = '\0';
 430                 if (nread)
 431                         *nread = el->el_line.cursor - el->el_line.buffer;
 432                 return (el->el_line.buffer);
 433         }
 434
 435
 436 #ifdef FIONREAD
 437         if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
 438                 long chrs = 0;
 439
 440                 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
 441                 if (chrs == 0) {
 442                         if (tty_rawmode(el) < 0) {
 443                                 if (nread)
 444                                         *nread = 0;
 445                                 return (NULL);
 446                         }
 447                 }
 448         }
 449 #endif /* FIONREAD */
 450
 451         if ((el->el_flags & UNBUFFERED) == 0)
 452                 read_prepare(el);
 453
 454         if (el->el_flags & EDIT_DISABLED) {
 455                 char *cp;
 456                 size_t idx;
 457                 if ((el->el_flags & UNBUFFERED) == 0)
 458                         cp = el->el_line.buffer;
 459                 else
 460                         cp = el->el_line.lastchar;
 461
 462                 term__flush();
 463
 464                 while ((*el->el_read.read_char)(el, cp) == 1) {
 465                         /* make sure there is space next character */
 466                         if (cp + 1 >= el->el_line.limit) {
 467                                 idx = (cp - el->el_line.buffer);
 468                                 if (!ch_enlargebufs(el, 2))
 469                                         break;
 470                                 cp = &el->el_line.buffer[idx];
 471                         }
 472                         if (*cp == 4)   /* ought to be stty eof */
 473                                 break;
 474                         cp++;
 475                         crlf = cp[-1] == '\r' || cp[-1] == '\n';
 476                         if (el->el_flags & UNBUFFERED)
 477                                 break;
 478                         if (crlf)
 479                                 break;
 480                 }
 481
 482                 el->el_line.cursor = el->el_line.lastchar = cp;
 483                 *cp = '\0';
 484                 if (nread)
 485                         *nread = el->el_line.cursor - el->el_line.buffer;
 486                 return (el->el_line.buffer);
 487         }
 488
 489         for (num = OKCMD; num == OKCMD;) {      /* while still editing this
 490                                                  * line */
 491 #ifdef DEBUG_EDIT
 492                 read_debug(el);
 493 #endif /* DEBUG_EDIT */
 494                 /* if EOF or error */
 495                 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
 496 #ifdef DEBUG_READ
 497                         (void) fprintf(el->el_errfile,
 498                             "Returning from el_gets %d\n", num);
 499 #endif /* DEBUG_READ */
 500                         break;
 501                 }
 502                 if ((unsigned int)cmdnum >= el->el_map.nfunc) { /* BUG CHECK command */
 503 #ifdef DEBUG_EDIT
 504                         (void) fprintf(el->el_errfile,
 505                             "ERROR: illegal command from key 0%o\r\n", ch);
 506 #endif /* DEBUG_EDIT */
 507                         continue;       /* try again */
 508                 }
 509                 /* now do the real command */
 510 #ifdef DEBUG_READ
 511                 {
 512                         el_bindings_t *b;
 513                         for (b = el->el_map.help; b->name; b++)
 514                                 if (b->func == cmdnum)
 515                                         break;
 516                         if (b->name)
 517                                 (void) fprintf(el->el_errfile,
 518                                     "Executing %s\n", b->name);
 519                         else
 520                                 (void) fprintf(el->el_errfile,
 521                                     "Error command = %d\n", cmdnum);
 522                 }
 523 #endif /* DEBUG_READ */
 524                 /* vi redo needs these way down the levels... */
 525                 el->el_state.thiscmd = cmdnum;
 526                 el->el_state.thisch = ch;
 527                 if (el->el_map.type == MAP_VI &&
 528                     el->el_map.current == el->el_map.key &&
 529                     el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
 530                         if (cmdnum == VI_DELETE_PREV_CHAR &&
 531                             el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
 532                             && isprint((unsigned char)el->el_chared.c_redo.pos[-1]))
 533                                 el->el_chared.c_redo.pos--;
 534                         else
 535                                 *el->el_chared.c_redo.pos++ = ch;
 536                 }
 537                 retval = (*el->el_map.func[cmdnum]) (el, ch);
 538 #ifdef DEBUG_READ
 539                 (void) fprintf(el->el_errfile,
 540                         "Returned state %d\n", retval );
 541 #endif /* DEBUG_READ */
 542
 543                 /* save the last command here */
 544                 el->el_state.lastcmd = cmdnum;
 545
 546                 /* use any return value */
 547                 switch (retval) {
 548                 case CC_CURSOR:
 549                         re_refresh_cursor(el);
 550                         break;
 551
 552                 case CC_REDISPLAY:
 553                         re_clear_lines(el);
 554                         re_clear_display(el);
 555                         /* FALLTHROUGH */
 556
 557                 case CC_REFRESH:
 558                         re_refresh(el);
 559                         break;
 560
 561                 case CC_REFRESH_BEEP:
 562                         re_refresh(el);
 563                         term_beep(el);
 564                         break;
 565
 566                 case CC_NORM:   /* normal char */
 567                         break;
 568
 569                 case CC_ARGHACK:        /* Suggested by Rich Salz */
 570                         /* <rsalz@pineapple.bbn.com> */
 571                         continue;       /* keep going... */
 572
 573                 case CC_EOF:    /* end of file typed */
 574                         if ((el->el_flags & UNBUFFERED) == 0)
 575                                 num = 0;
 576                         else if (num == -1) {
 577                                 *el->el_line.lastchar++ = CONTROL('d');
 578                                 el->el_line.cursor = el->el_line.lastchar;
 579                                 num = 1;
 580                         }
 581                         break;
 582
 583                 case CC_NEWLINE:        /* normal end of line */
 584                         num = el->el_line.lastchar - el->el_line.buffer;
 585                         break;
 586
 587                 case CC_FATAL:  /* fatal error, reset to known state */
 588 #ifdef DEBUG_READ
 589                         (void) fprintf(el->el_errfile,
 590                             "*** editor fatal ERROR ***\r\n\n");
 591 #endif /* DEBUG_READ */
 592                         /* put (real) cursor in a known place */
 593                         re_clear_display(el);   /* reset the display stuff */
 594                         ch_reset(el, 1);        /* reset the input pointers */
 595                         re_refresh(el); /* print the prompt again */
 596                         break;
 597
 598                 case CC_ERROR:
 599                 default:        /* functions we don't know about */
 600 #ifdef DEBUG_READ
 601                         (void) fprintf(el->el_errfile,
 602                             "*** editor ERROR ***\r\n\n");
 603 #endif /* DEBUG_READ */
 604                         term_beep(el);
 605                         term__flush();
 606                         break;
 607                 }
 608                 el->el_state.argument = 1;
 609                 el->el_state.doingarg = 0;
 610                 el->el_chared.c_vcmd.action = NOP;
 611                 if (el->el_flags & UNBUFFERED)
 612                         break;
 613         }
 614
 615         term__flush();          /* flush any buffered output */
 616         /* make sure the tty is set up correctly */
 617         if ((el->el_flags & UNBUFFERED) == 0) {
 618                 read_finish(el);
 619                 if (nread)
 620                         *nread = num;
 621         } else {
 622                 if (nread)
 623                         *nread = el->el_line.lastchar - el->el_line.buffer;
 624         }
 625         return (num ? el->el_line.buffer : NULL);
 626 }