lib/libedit/el.c

   1 /*      $NetBSD: el.c,v 1.73 2014/06/18 18:12:28 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[] = "@(#)el.c        8.2 (Berkeley) 1/3/94";
  39 #else
  40 __RCSID("$NetBSD: el.c,v 1.73 2014/06/18 18:12:28 christos Exp $");
  41 #endif
  42 #endif /* not lint && not SCCSID */
  43
  44 /*
  45  * el.c: EditLine interface functions
  46  */
  47 #include <sys/types.h>
  48 #include <sys/param.h>
  49 #include <string.h>
  50 #include <stdlib.h>
  51 #include <stdarg.h>
  52 #include <ctype.h>
  53 #include <locale.h>
  54 #include <langinfo.h>
  55 #include "el.h"
  56
  57 /* el_init():
  58  *      Initialize editline and set default parameters.
  59  */
  60 public EditLine *
  61 el_init(const char *prog, FILE *fin, FILE *fout, FILE *ferr)
  62 {
  63     return el_init_fd(prog, fin, fout, ferr, fileno(fin), fileno(fout),
  64         fileno(ferr));
  65 }
  66
  67 public EditLine *
  68 el_init_fd(const char *prog, FILE *fin, FILE *fout, FILE *ferr,
  69     int fdin, int fdout, int fderr)
  70 {
  71         EditLine *el = el_malloc(sizeof(*el));
  72
  73         if (el == NULL)
  74                 return NULL;
  75
  76         memset(el, 0, sizeof(EditLine));
  77
  78         el->el_infile = fin;
  79         el->el_outfile = fout;
  80         el->el_errfile = ferr;
  81
  82         el->el_infd = fdin;
  83         el->el_outfd = fdout;
  84         el->el_errfd = fderr;
  85
  86         el->el_prog = Strdup(ct_decode_string(prog, &el->el_scratch));
  87         if (el->el_prog == NULL) {
  88                 el_free(el);
  89                 return NULL;
  90         }
  91
  92         /*
  93          * Initialize all the modules. Order is important!!!
  94          */
  95         el->el_flags = 0;
  96 #ifdef WIDECHAR
  97         if (setlocale(LC_CTYPE, NULL) != NULL){
  98                 if (strcmp(nl_langinfo(CODESET), "UTF-8") == 0)
  99                         el->el_flags |= CHARSET_IS_UTF8;
 100         }
 101 #endif
 102
 103         if (terminal_init(el) == -1) {
 104                 el_free(el->el_prog);
 105                 el_free(el);
 106                 return NULL;
 107         }
 108         (void) keymacro_init(el);
 109         (void) map_init(el);
 110         if (tty_init(el) == -1)
 111                 el->el_flags |= NO_TTY;
 112         (void) ch_init(el);
 113         (void) search_init(el);
 114         (void) hist_init(el);
 115         (void) prompt_init(el);
 116         (void) sig_init(el);
 117         (void) read_init(el);
 118
 119         return el;
 120 }
 121
 122
 123 /* el_end():
 124  *      Clean up.
 125  */
 126 public void
 127 el_end(EditLine *el)
 128 {
 129
 130         if (el == NULL)
 131                 return;
 132
 133         el_reset(el);
 134
 135         terminal_end(el);
 136         keymacro_end(el);
 137         map_end(el);
 138         tty_end(el);
 139         ch_end(el);
 140         search_end(el);
 141         hist_end(el);
 142         prompt_end(el);
 143         sig_end(el);
 144
 145         el_free(el->el_prog);
 146 #ifdef WIDECHAR
 147         el_free(el->el_scratch.cbuff);
 148         el_free(el->el_scratch.wbuff);
 149         el_free(el->el_lgcyconv.cbuff);
 150         el_free(el->el_lgcyconv.wbuff);
 151 #endif
 152         el_free(el);
 153 }
 154
 155
 156 /* el_reset():
 157  *      Reset the tty and the parser
 158  */
 159 public void
 160 el_reset(EditLine *el)
 161 {
 162
 163         tty_cookedmode(el);
 164         ch_reset(el, 0);                /* XXX: Do we want that? */
 165 }
 166
 167
 168 /* el_set():
 169  *      set the editline parameters
 170  */
 171 public int
 172 FUN(el,set)(EditLine *el, int op, ...)
 173 {
 174         va_list ap;
 175         int rv = 0;
 176
 177         if (el == NULL)
 178                 return -1;
 179         va_start(ap, op);
 180
 181         switch (op) {
 182         case EL_PROMPT:
 183         case EL_RPROMPT: {
 184                 el_pfunc_t p = va_arg(ap, el_pfunc_t);
 185
 186                 rv = prompt_set(el, p, 0, op, 1);
 187                 break;
 188         }
 189
 190         case EL_RESIZE: {
 191                 el_zfunc_t p = va_arg(ap, el_zfunc_t);
 192                 void *arg = va_arg(ap, void *);
 193                 rv = ch_resizefun(el, p, arg);
 194                 break;
 195         }
 196
 197         case EL_ALIAS_TEXT: {
 198                 el_afunc_t p = va_arg(ap, el_afunc_t);
 199                 void *arg = va_arg(ap, void *);
 200                 rv = ch_aliasfun(el, p, arg);
 201                 break;
 202         }
 203
 204         case EL_PROMPT_ESC:
 205         case EL_RPROMPT_ESC: {
 206                 el_pfunc_t p = va_arg(ap, el_pfunc_t);
 207                 int c = va_arg(ap, int);
 208
 209                 rv = prompt_set(el, p, c, op, 1);
 210                 break;
 211         }
 212
 213         case EL_TERMINAL:
 214                 rv = terminal_set(el, va_arg(ap, char *));
 215                 break;
 216
 217         case EL_EDITOR:
 218                 rv = map_set_editor(el, va_arg(ap, Char *));
 219                 break;
 220
 221         case EL_SIGNAL:
 222                 if (va_arg(ap, int))
 223                         el->el_flags |= HANDLE_SIGNALS;
 224                 else
 225                         el->el_flags &= ~HANDLE_SIGNALS;
 226                 break;
 227
 228         case EL_BIND:
 229         case EL_TELLTC:
 230         case EL_SETTC:
 231         case EL_ECHOTC:
 232         case EL_SETTY:
 233         {
 234                 const Char *argv[20];
 235                 int i;
 236
 237                 for (i = 1; i < (int)__arraycount(argv); i++)
 238                         if ((argv[i] = va_arg(ap, Char *)) == NULL)
 239                                 break;
 240
 241                 switch (op) {
 242                 case EL_BIND:
 243                         argv[0] = STR("bind");
 244                         rv = map_bind(el, i, argv);
 245                         break;
 246
 247                 case EL_TELLTC:
 248                         argv[0] = STR("telltc");
 249                         rv = terminal_telltc(el, i, argv);
 250                         break;
 251
 252                 case EL_SETTC:
 253                         argv[0] = STR("settc");
 254                         rv = terminal_settc(el, i, argv);
 255                         break;
 256
 257                 case EL_ECHOTC:
 258                         argv[0] = STR("echotc");
 259                         rv = terminal_echotc(el, i, argv);
 260                         break;
 261
 262                 case EL_SETTY:
 263                         argv[0] = STR("setty");
 264                         rv = tty_stty(el, i, argv);
 265                         break;
 266
 267                 default:
 268                         rv = -1;
 269                         EL_ABORT((el->el_errfile, "Bad op %d\n", op));
 270                         break;
 271                 }
 272                 break;
 273         }
 274
 275         case EL_ADDFN:
 276         {
 277                 Char *name = va_arg(ap, Char *);
 278                 Char *help = va_arg(ap, Char *);
 279                 el_func_t func = va_arg(ap, el_func_t);
 280
 281                 rv = map_addfunc(el, name, help, func);
 282                 break;
 283         }
 284
 285         case EL_HIST:
 286         {
 287                 hist_fun_t func = va_arg(ap, hist_fun_t);
 288                 void *ptr = va_arg(ap, void *);
 289
 290                 rv = hist_set(el, func, ptr);
 291                 if (!(el->el_flags & CHARSET_IS_UTF8))
 292                         el->el_flags &= ~NARROW_HISTORY;
 293                 break;
 294         }
 295
 296         case EL_EDITMODE:
 297                 if (va_arg(ap, int))
 298                         el->el_flags &= ~EDIT_DISABLED;
 299                 else
 300                         el->el_flags |= EDIT_DISABLED;
 301                 rv = 0;
 302                 break;
 303
 304         case EL_GETCFN:
 305         {
 306                 el_rfunc_t rc = va_arg(ap, el_rfunc_t);
 307                 rv = el_read_setfn(el, rc);
 308                 el->el_flags &= ~NARROW_READ;
 309                 break;
 310         }
 311
 312         case EL_CLIENTDATA:
 313                 el->el_data = va_arg(ap, void *);
 314                 break;
 315
 316         case EL_UNBUFFERED:
 317                 rv = va_arg(ap, int);
 318                 if (rv && !(el->el_flags & UNBUFFERED)) {
 319                         el->el_flags |= UNBUFFERED;
 320                         read_prepare(el);
 321                 } else if (!rv && (el->el_flags & UNBUFFERED)) {
 322                         el->el_flags &= ~UNBUFFERED;
 323                         read_finish(el);
 324                 }
 325                 rv = 0;
 326                 break;
 327
 328         case EL_PREP_TERM:
 329                 rv = va_arg(ap, int);
 330                 if (rv)
 331                         (void) tty_rawmode(el);
 332                 else
 333                         (void) tty_cookedmode(el);
 334                 rv = 0;
 335                 break;
 336
 337         case EL_SETFP:
 338         {
 339                 FILE *fp;
 340                 int what;
 341
 342                 what = va_arg(ap, int);
 343                 fp = va_arg(ap, FILE *);
 344
 345                 rv = 0;
 346                 switch (what) {
 347                 case 0:
 348                         el->el_infile = fp;
 349                         el->el_infd = fileno(fp);
 350                         break;
 351                 case 1:
 352                         el->el_outfile = fp;
 353                         el->el_outfd = fileno(fp);
 354                         break;
 355                 case 2:
 356                         el->el_errfile = fp;
 357                         el->el_errfd = fileno(fp);
 358                         break;
 359                 default:
 360                         rv = -1;
 361                         break;
 362                 }
 363                 break;
 364         }
 365
 366         case EL_REFRESH:
 367                 re_clear_display(el);
 368                 re_refresh(el);
 369                 terminal__flush(el);
 370                 break;
 371
 372         default:
 373                 rv = -1;
 374                 break;
 375         }
 376
 377         va_end(ap);
 378         return rv;
 379 }
 380
 381
 382 /* el_get():
 383  *      retrieve the editline parameters
 384  */
 385 public int
 386 FUN(el,get)(EditLine *el, int op, ...)
 387 {
 388         va_list ap;
 389         int rv;
 390
 391         if (el == NULL)
 392                 return -1;
 393
 394         va_start(ap, op);
 395
 396         switch (op) {
 397         case EL_PROMPT:
 398         case EL_RPROMPT: {
 399                 el_pfunc_t *p = va_arg(ap, el_pfunc_t *);
 400                 rv = prompt_get(el, p, 0, op);
 401                 break;
 402         }
 403         case EL_PROMPT_ESC:
 404         case EL_RPROMPT_ESC: {
 405                 el_pfunc_t *p = va_arg(ap, el_pfunc_t *);
 406                 Char *c = va_arg(ap, Char *);
 407
 408                 rv = prompt_get(el, p, c, op);
 409                 break;
 410         }
 411
 412         case EL_EDITOR:
 413                 rv = map_get_editor(el, va_arg(ap, const Char **));
 414                 break;
 415
 416         case EL_SIGNAL:
 417                 *va_arg(ap, int *) = (el->el_flags & HANDLE_SIGNALS);
 418                 rv = 0;
 419                 break;
 420
 421         case EL_EDITMODE:
 422                 *va_arg(ap, int *) = !(el->el_flags & EDIT_DISABLED);
 423                 rv = 0;
 424                 break;
 425
 426         case EL_TERMINAL:
 427                 terminal_get(el, va_arg(ap, const char **));
 428                 rv = 0;
 429                 break;
 430
 431         case EL_GETTC:
 432         {
 433                 static char name[] = "gettc";
 434                 char *argv[20];
 435                 int i;
 436
 437                 for (i = 1; i < (int)__arraycount(argv); i++)
 438                         if ((argv[i] = va_arg(ap, char *)) == NULL)
 439                                 break;
 440
 441                 argv[0] = name;
 442                 rv = terminal_gettc(el, i, argv);
 443                 break;
 444         }
 445
 446         case EL_GETCFN:
 447                 *va_arg(ap, el_rfunc_t *) = el_read_getfn(el);
 448                 rv = 0;
 449                 break;
 450
 451         case EL_CLIENTDATA:
 452                 *va_arg(ap, void **) = el->el_data;
 453                 rv = 0;
 454                 break;
 455
 456         case EL_UNBUFFERED:
 457                 *va_arg(ap, int *) = (el->el_flags & UNBUFFERED) != 0;
 458                 rv = 0;
 459                 break;
 460
 461         case EL_GETFP:
 462         {
 463                 int what;
 464                 FILE **fpp;
 465
 466                 what = va_arg(ap, int);
 467                 fpp = va_arg(ap, FILE **);
 468                 rv = 0;
 469                 switch (what) {
 470                 case 0:
 471                         *fpp = el->el_infile;
 472                         break;
 473                 case 1:
 474                         *fpp = el->el_outfile;
 475                         break;
 476                 case 2:
 477                         *fpp = el->el_errfile;
 478                         break;
 479                 default:
 480                         rv = -1;
 481                         break;
 482                 }
 483                 break;
 484         }
 485         default:
 486                 rv = -1;
 487                 break;
 488         }
 489         va_end(ap);
 490
 491         return rv;
 492 }
 493
 494
 495 /* el_line():
 496  *      Return editing info
 497  */
 498 public const TYPE(LineInfo) *
 499 FUN(el,line)(EditLine *el)
 500 {
 501
 502         return (const TYPE(LineInfo) *)(void *)&el->el_line;
 503 }
 504
 505
 506 /* el_source():
 507  *      Source a file
 508  */
 509 public int
 510 el_source(EditLine *el, const char *fname)
 511 {
 512         FILE *fp;
 513         size_t len;
 514         char *ptr;
 515         char *path = NULL;
 516         const Char *dptr;
 517         int error = 0;
 518
 519         fp = NULL;
 520         if (fname == NULL) {
 521 #ifdef HAVE_ISSETUGID
 522                 static const char elpath[] = "/.editrc";
 523                 size_t plen = sizeof(elpath);
 524
 525                 if (issetugid())
 526                         return -1;
 527                 if ((ptr = getenv("HOME")) == NULL)
 528                         return -1;
 529                 plen += strlen(ptr);
 530                 if ((path = el_malloc(plen * sizeof(*path))) == NULL)
 531                         return -1;
 532                 (void)snprintf(path, plen, "%s%s", ptr, elpath);
 533                 fname = path;
 534 #else
 535                 /*
 536                  * If issetugid() is missing, always return an error, in order
 537                  * to keep from inadvertently opening up the user to a security
 538                  * hole.
 539                  */
 540                 return -1;
 541 #endif
 542         }
 543         if (fp == NULL)
 544                 fp = fopen(fname, "r");
 545         if (fp == NULL) {
 546                 el_free(path);
 547                 return -1;
 548         }
 549
 550         while ((ptr = fgetln(fp, &len)) != NULL) {
 551                 if (*ptr == '\n')
 552                         continue;       /* Empty line. */
 553                 dptr = ct_decode_string(ptr, &el->el_scratch);
 554                 if (!dptr)
 555                         continue;
 556                 if (len > 0 && dptr[len - 1] == '\n')
 557                         --len;
 558
 559                 /* loop until first non-space char or EOL */
 560                 while (*dptr != '\0' && Isspace(*dptr))
 561                         dptr++;
 562                 if (*dptr == '#')
 563                         continue;   /* ignore, this is a comment line */
 564                 if ((error = parse_line(el, dptr)) == -1)
 565                         break;
 566         }
 567
 568         el_free(path);
 569         (void) fclose(fp);
 570         return error;
 571 }
 572
 573
 574 /* el_resize():
 575  *      Called from program when terminal is resized
 576  */
 577 public void
 578 el_resize(EditLine *el)
 579 {
 580         int lins, cols;
 581         sigset_t oset, nset;
 582
 583         (void) sigemptyset(&nset);
 584         (void) sigaddset(&nset, SIGWINCH);
 585         (void) sigprocmask(SIG_BLOCK, &nset, &oset);
 586
 587         /* get the correct window size */
 588         if (terminal_get_size(el, &lins, &cols))
 589                 terminal_change_size(el, lins, cols);
 590
 591         (void) sigprocmask(SIG_SETMASK, &oset, NULL);
 592 }
 593
 594
 595 /* el_beep():
 596  *      Called from the program to beep
 597  */
 598 public void
 599 el_beep(EditLine *el)
 600 {
 601
 602         terminal_beep(el);
 603 }
 604
 605
 606 /* el_editmode()
 607  *      Set the state of EDIT_DISABLED from the `edit' command.
 608  */
 609 protected int
 610 /*ARGSUSED*/
 611 el_editmode(EditLine *el, int argc, const Char **argv)
 612 {
 613         const Char *how;
 614
 615         if (argv == NULL || argc != 2 || argv[1] == NULL)
 616                 return -1;
 617
 618         how = argv[1];
 619         if (Strcmp(how, STR("on")) == 0) {
 620                 el->el_flags &= ~EDIT_DISABLED;
 621                 tty_rawmode(el);
 622         } else if (Strcmp(how, STR("off")) == 0) {
 623                 tty_cookedmode(el);
 624                 el->el_flags |= EDIT_DISABLED;
 625         }
 626         else {
 627                 (void) fprintf(el->el_errfile, "edit: Bad value `" FSTR "'.\n",
 628                     how);
 629                 return -1;
 630         }
 631         return 0;
 632 }