contrib/nvi/tcl_api/tcl.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995
   5  *      Keith Bostic.  All rights reserved.
   6  * Copyright (c) 1995
   7  *      George V. Neville-Neil. All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 static const char sccsid[] = "@(#)tcl.c 8.16 (Berkeley) 10/16/96";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20 #include <sys/time.h>
  21
  22 #include <bitstring.h>
  23 #include <errno.h>
  24 #include <limits.h>
  25 #include <signal.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <tcl.h>
  30 #include <termios.h>
  31 #include <unistd.h>
  32
  33 #include "../common/common.h"
  34 #include "tcl_extern.h"
  35
  36 static int  getint __P((Tcl_Interp *, char *, char *, int *));
  37 static int  getscreenid __P((Tcl_Interp *, SCR **, char *, char *));
  38 static void msghandler __P((SCR *, mtype_t, char *, size_t));
  39
  40 extern GS *__global_list;                       /* XXX */
  41
  42 /*
  43  * INITMESSAGE --
  44  *      Macros to point messages at the Tcl message handler.
  45  */
  46 #define INITMESSAGE                                                     \
  47         scr_msg = __global_list->scr_msg;                               \
  48         __global_list->scr_msg = msghandler;
  49 #define ENDMESSAGE                                                      \
  50         __global_list->scr_msg = scr_msg;
  51
  52 /*
  53  * tcl_fscreen --
  54  *      Return the screen id associated with file name.
  55  *
  56  * Tcl Command: viFindScreen
  57  * Usage: viFindScreen file
  58  */
  59 static int
  60 tcl_fscreen(clientData, interp, argc, argv)
  61         ClientData clientData;
  62         Tcl_Interp *interp;
  63         int argc;
  64         char **argv;
  65 {
  66         SCR *sp;
  67
  68         if (argc != 2) {
  69                 Tcl_SetResult(interp, "Usage: viFindScreen file", TCL_STATIC);
  70                 return (TCL_ERROR);
  71         }
  72
  73         if (getscreenid(interp, &sp, NULL, argv[1]))
  74                 return (TCL_ERROR);
  75
  76         (void)sprintf(interp->result, "%d", sp->id);
  77         return (TCL_OK);
  78 }
  79
  80 /*
  81  * tcl_aline --
  82  *      -- Append the string text after the line in lineNumber.
  83  *
  84  * Tcl Command: viAppendLine
  85  * Usage: viAppendLine screenId lineNumber text
  86  */
  87 static int
  88 tcl_aline(clientData, interp, argc, argv)
  89         ClientData clientData;
  90         Tcl_Interp *interp;
  91         int argc;
  92         char **argv;
  93 {
  94         SCR *sp;
  95         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
  96         int lno, rval;
  97
  98         if (argc != 4) {
  99                 Tcl_SetResult(interp,
 100                     "Usage: viAppendLine screenId lineNumber text", TCL_STATIC);
 101                 return (TCL_ERROR);
 102         }
 103
 104         if (getscreenid(interp, &sp, argv[1], NULL) ||
 105             getint(interp, "line number", argv[2], &lno))
 106                 return (TCL_ERROR);
 107         INITMESSAGE;
 108         rval = api_aline(sp, (recno_t)lno, argv[3], strlen(argv[3]));
 109         ENDMESSAGE;
 110
 111         return (rval ? TCL_ERROR : TCL_OK);
 112 }
 113
 114 /*
 115  * tcl_dline --
 116  *      Delete lineNum.
 117  *
 118  * Tcl Command: viDelLine
 119  * Usage: viDelLine screenId lineNum
 120  */
 121 static int
 122 tcl_dline(clientData, interp, argc, argv)
 123         ClientData clientData;
 124         Tcl_Interp *interp;
 125         int argc;
 126         char **argv;
 127 {
 128         SCR *sp;
 129         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 130         int lno, rval;
 131
 132         if (argc != 3) {
 133                 Tcl_SetResult(interp,
 134                     "Usage: viDelLine screenId lineNumber", TCL_STATIC);
 135                 return (TCL_ERROR);
 136         }
 137
 138         if (getscreenid(interp, &sp, argv[1], NULL) ||
 139             getint(interp, "line number", argv[2], &lno))
 140                 return (TCL_ERROR);
 141         INITMESSAGE;
 142         rval = api_dline(sp, (recno_t)lno);
 143         ENDMESSAGE;
 144
 145         return (rval ? TCL_ERROR : TCL_OK);
 146 }
 147
 148 /*
 149  * tcl_gline --
 150  *      Return lineNumber.
 151  *
 152  * Tcl Command: viGetLine
 153  * Usage: viGetLine screenId lineNumber
 154  */
 155 static int
 156 tcl_gline(clientData, interp, argc, argv)
 157         ClientData clientData;
 158         Tcl_Interp *interp;
 159         int argc;
 160         char **argv;
 161 {
 162         SCR *sp;
 163         size_t len;
 164         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 165         int lno, rval;
 166         char *line, *p;
 167
 168         if (argc != 3) {
 169                 Tcl_SetResult(interp,
 170                     "Usage: viGetLine screenId lineNumber", TCL_STATIC);
 171                 return (TCL_ERROR);
 172         }
 173         if (getscreenid(interp, &sp, argv[1], NULL) ||
 174             getint(interp, "line number", argv[2], &lno))
 175                 return (TCL_ERROR);
 176         INITMESSAGE;
 177         rval = api_gline(sp, (recno_t)lno, &p, &len);
 178         ENDMESSAGE;
 179
 180         if (rval)
 181                 return (TCL_ERROR);
 182
 183         if ((line = malloc(len + 1)) == NULL)
 184                 exit(1);                                /* XXX */
 185         memmove(line, p, len);
 186         line[len] = '\0';
 187         Tcl_SetResult(interp, line, TCL_DYNAMIC);
 188         return (TCL_OK);
 189 }
 190
 191 /*
 192  * tcl_iline --
 193  *      Insert the string text after the line in lineNumber.
 194  *
 195  * Tcl Command: viInsertLine
 196  * Usage: viInsertLine screenId lineNumber text
 197  */
 198 static int
 199 tcl_iline(clientData, interp, argc, argv)
 200         ClientData clientData;
 201         Tcl_Interp *interp;
 202         int argc;
 203         char **argv;
 204 {
 205         SCR *sp;
 206         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 207         int lno, rval;
 208
 209         if (argc != 4) {
 210                 Tcl_SetResult(interp,
 211                     "Usage: viInsertLine screenId lineNumber text", TCL_STATIC);
 212                 return (TCL_ERROR);
 213         }
 214
 215         if (getscreenid(interp, &sp, argv[1], NULL) ||
 216             getint(interp, "line number", argv[2], &lno))
 217                 return (TCL_ERROR);
 218         INITMESSAGE;
 219         rval = api_iline(sp, (recno_t)lno, argv[3], strlen(argv[3]));
 220         ENDMESSAGE;
 221
 222         return (rval ? TCL_ERROR : TCL_OK);
 223 }
 224
 225 /*
 226  * tcl_lline --
 227  *      Return the last line in the screen.
 228  *
 229  * Tcl Command: viLastLine
 230  * Usage: viLastLine screenId
 231  */
 232 static int
 233 tcl_lline(clientData, interp, argc, argv)
 234         ClientData clientData;
 235         Tcl_Interp *interp;
 236         int argc;
 237         char **argv;
 238 {
 239         SCR *sp;
 240         recno_t last;
 241         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 242         int rval;
 243
 244         if (argc != 2) {
 245                 Tcl_SetResult(interp, "Usage: viLastLine screenId", TCL_STATIC);
 246                 return (TCL_ERROR);
 247         }
 248
 249         if (getscreenid(interp, &sp, argv[1], NULL))
 250                 return (TCL_ERROR);
 251         INITMESSAGE;
 252         rval = api_lline(sp, &last);
 253         ENDMESSAGE;
 254         if (rval)
 255                 return (TCL_ERROR);
 256
 257         (void)sprintf(interp->result, "%lu", (unsigned long)last);
 258         return (TCL_OK);
 259 }
 260
 261 /*
 262  * tcl_sline --
 263  *      Set lineNumber to the text supplied.
 264  *
 265  * Tcl Command: viSetLine
 266  * Usage: viSetLine screenId lineNumber text
 267  */
 268 static int
 269 tcl_sline(clientData, interp, argc, argv)
 270         ClientData clientData;
 271         Tcl_Interp *interp;
 272         int argc;
 273         char **argv;
 274 {
 275         SCR *sp;
 276         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 277         int lno, rval;
 278
 279         if (argc != 4) {
 280                 Tcl_SetResult(interp,
 281                     "Usage: viSetLine screenId lineNumber text", TCL_STATIC);
 282                 return (TCL_ERROR);
 283         }
 284
 285         if (getscreenid(interp, &sp, argv[1], NULL) ||
 286             getint(interp, "line number", argv[2], &lno))
 287                 return (TCL_ERROR);
 288         INITMESSAGE;
 289         rval = api_sline(sp, (recno_t)lno, argv[3], strlen(argv[3]));
 290         ENDMESSAGE;
 291
 292         return (rval ? TCL_ERROR : TCL_OK);
 293 }
 294
 295 /*
 296  * tcl_getmark --
 297  *      Return the mark's cursor position as a list with two elements.
 298  *      {line, column}.
 299  *
 300  * Tcl Command: viGetMark
 301  * Usage: viGetMark screenId mark
 302  */
 303 static int
 304 tcl_getmark(clientData, interp, argc, argv)
 305         ClientData clientData;
 306         Tcl_Interp *interp;
 307         int argc;
 308         char **argv;
 309 {
 310         MARK cursor;
 311         SCR *sp;
 312         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 313         int rval;
 314         char buf[20];
 315
 316         if (argc != 3) {
 317                 Tcl_SetResult(interp,
 318                     "Usage: viGetMark screenId mark", TCL_STATIC);
 319                 return (TCL_ERROR);
 320         }
 321
 322         if (getscreenid(interp, &sp, argv[1], NULL))
 323                 return (TCL_ERROR);
 324         INITMESSAGE;
 325         rval = api_getmark(sp, (int)argv[2][0], &cursor);
 326         ENDMESSAGE;
 327
 328         if (rval)
 329                 return (TCL_ERROR);
 330
 331         (void)snprintf(buf, sizeof(buf), "%lu", (u_long)cursor.lno);
 332         Tcl_AppendElement(interp, buf);
 333         (void)snprintf(buf, sizeof(buf), "%lu", (u_long)cursor.cno);
 334         Tcl_AppendElement(interp, buf);
 335         return (TCL_OK);
 336 }
 337
 338 /*
 339  * tcl_setmark --
 340  *      Set the mark to the line and column numbers supplied.
 341  *
 342  * Tcl Command: viSetMark
 343  * Usage: viSetMark screenId mark line column
 344  */
 345 static int
 346 tcl_setmark(clientData, interp, argc, argv)
 347         ClientData clientData;
 348         Tcl_Interp *interp;
 349         int argc;
 350         char **argv;
 351 {
 352         MARK cursor;
 353         SCR *sp;
 354         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 355         int i, rval;
 356
 357         if (argc != 5) {
 358                 Tcl_SetResult(interp,
 359                     "Usage: viSetMark screenId mark line column", TCL_STATIC);
 360                 return (TCL_ERROR);
 361         }
 362
 363         if (getscreenid(interp, &sp, argv[1], NULL))
 364                 return (TCL_ERROR);
 365         if (getint(interp, "line number", argv[3], &i))
 366                 return (TCL_ERROR);
 367         cursor.lno = i;
 368         if (getint(interp, "column number", argv[4], &i))
 369                 return (TCL_ERROR);
 370         cursor.cno = i;
 371         INITMESSAGE;
 372         rval = api_setmark(sp, (int)argv[2][0], &cursor);
 373         ENDMESSAGE;
 374
 375         return (rval ? TCL_ERROR : TCL_OK);
 376 }
 377
 378 /*
 379  * tcl_getcursor --
 380  *      Return the current cursor position as a list with two elements.
 381  *      {line, column}.
 382  *
 383  * Tcl Command: viGetCursor
 384  * Usage: viGetCursor screenId
 385  */
 386 static int
 387 tcl_getcursor(clientData, interp, argc, argv)
 388         ClientData clientData;
 389         Tcl_Interp *interp;
 390         int argc;
 391         char **argv;
 392 {
 393         MARK cursor;
 394         SCR *sp;
 395         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 396         int rval;
 397         char buf[20];
 398
 399         if (argc != 2) {
 400                 Tcl_SetResult(interp,
 401                     "Usage: viGetCursor screenId", TCL_STATIC);
 402                 return (TCL_ERROR);
 403         }
 404
 405         if (getscreenid(interp, &sp, argv[1], NULL))
 406                 return (TCL_ERROR);
 407         INITMESSAGE;
 408         rval = api_getcursor(sp, &cursor);
 409         ENDMESSAGE;
 410
 411         if (rval)
 412                 return (TCL_ERROR);
 413
 414         (void)snprintf(buf, sizeof(buf), "%lu", (u_long)cursor.lno);
 415         Tcl_AppendElement(interp, buf);
 416         (void)snprintf(buf, sizeof(buf), "%lu", (u_long)cursor.cno);
 417         Tcl_AppendElement(interp, buf);
 418         return (TCL_OK);
 419 }
 420
 421 /*
 422  * tcl_setcursor --
 423  *      Set the cursor to the line and column numbers supplied.
 424  *
 425  * Tcl Command: viSetCursor
 426  * Usage: viSetCursor screenId line column
 427  */
 428 static int
 429 tcl_setcursor(clientData, interp, argc, argv)
 430         ClientData clientData;
 431         Tcl_Interp *interp;
 432         int argc;
 433         char **argv;
 434 {
 435         MARK cursor;
 436         SCR *sp;
 437         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 438         int i, rval;
 439
 440         if (argc != 4) {
 441                 Tcl_SetResult(interp,
 442                     "Usage: viSetCursor screenId line column", TCL_STATIC);
 443                 return (TCL_ERROR);
 444         }
 445
 446         if (getscreenid(interp, &sp, argv[1], NULL))
 447                 return (TCL_ERROR);
 448         if (getint(interp, "screen id", argv[2], &i))
 449                 return (TCL_ERROR);
 450         cursor.lno = i;
 451         if (getint(interp, "screen id", argv[3], &i))
 452                 return (TCL_ERROR);
 453         cursor.cno = i;
 454         INITMESSAGE;
 455         rval = api_setcursor(sp, &cursor);
 456         ENDMESSAGE;
 457
 458         return (rval ? TCL_ERROR : TCL_OK);
 459 }
 460
 461 /*
 462  * tcl_msg --
 463  *      Set the message line to text.
 464  *
 465  * Tcl Command: viMsg
 466  * Usage: viMsg screenId text
 467  */
 468 static int
 469 tcl_msg(clientData, interp, argc, argv)
 470         ClientData clientData;
 471         Tcl_Interp *interp;
 472         int argc;
 473         char **argv;
 474 {
 475         SCR *sp;
 476
 477         if (argc != 3) {
 478                 Tcl_SetResult(interp, "Usage: viMsg screenId text", TCL_STATIC);
 479                 return (TCL_ERROR);
 480         }
 481
 482         if (getscreenid(interp, &sp, argv[1], NULL))
 483                 return (TCL_ERROR);
 484         api_imessage(sp, argv[2]);
 485
 486         return (TCL_OK);
 487 }
 488
 489 /*
 490  * tcl_iscreen --
 491  *      Create a new screen.  If a filename is specified then the screen
 492  *      is opened with that file.
 493  *
 494  * Tcl Command: viNewScreen
 495  * Usage: viNewScreen screenId [file]
 496  */
 497 static int
 498 tcl_iscreen(clientData, interp, argc, argv)
 499         ClientData clientData;
 500         Tcl_Interp *interp;
 501         int argc;
 502         char **argv;
 503 {
 504         SCR *sp, *nsp;
 505         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 506         int rval;
 507
 508         if (argc != 2 && argc != 3) {
 509                 Tcl_SetResult(interp,
 510                     "Usage: viNewScreen screenId [file]", TCL_STATIC);
 511                 return (TCL_ERROR);
 512         }
 513
 514         if (getscreenid(interp, &sp, argv[1], NULL))
 515                 return (TCL_ERROR);
 516         INITMESSAGE;
 517         rval = api_edit(sp, argv[2], &nsp, 1);
 518         ENDMESSAGE;
 519
 520         if (rval)
 521                 return (TCL_ERROR);
 522
 523         (void)sprintf(interp->result, "%d", nsp->id);
 524         return (TCL_OK);
 525 }
 526
 527 /*
 528  * tcl_escreen --
 529  *      End a screen.
 530  *
 531  * Tcl Command: viEndScreen
 532  * Usage: viEndScreen screenId
 533  */
 534 static int
 535 tcl_escreen(clientData, interp, argc, argv)
 536         ClientData clientData;
 537         Tcl_Interp *interp;
 538         int argc;
 539         char **argv;
 540 {
 541         SCR *sp;
 542         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 543         int rval;
 544
 545         if (argc != 2) {
 546                 Tcl_SetResult(interp,
 547                      "Usage: viEndScreen screenId", TCL_STATIC);
 548                 return (TCL_ERROR);
 549         }
 550
 551         if (getscreenid(interp, &sp, argv[1], NULL))
 552                 return (TCL_ERROR);
 553         INITMESSAGE;
 554         rval = api_escreen(sp);
 555         ENDMESSAGE;
 556
 557         return (rval ? TCL_ERROR : TCL_OK);
 558 }
 559
 560 /*
 561  * tcl_swscreen --
 562  *      Change the current focus to screen.
 563  *
 564  * Tcl Command: viSwitchScreen
 565  * Usage: viSwitchScreen screenId screenId
 566  */
 567 static int
 568 tcl_swscreen(clientData, interp, argc, argv)
 569         ClientData clientData;
 570         Tcl_Interp *interp;
 571         int argc;
 572         char **argv;
 573 {
 574         SCR *sp, *new;
 575         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 576         int rval;
 577
 578         if (argc != 3) {
 579                 Tcl_SetResult(interp,
 580                     "Usage: viSwitchScreen cur_screenId new_screenId",
 581                     TCL_STATIC);
 582                 return (TCL_ERROR);
 583         }
 584
 585         if (getscreenid(interp, &sp, argv[1], NULL))
 586                 return (TCL_ERROR);
 587         if (getscreenid(interp, &new, argv[2], NULL))
 588                 return (TCL_ERROR);
 589         INITMESSAGE;
 590         rval = api_swscreen(sp, new);
 591         ENDMESSAGE;
 592
 593         return (rval ? TCL_ERROR : TCL_OK);
 594 }
 595
 596 /*
 597  * tcl_map --
 598  *      Associate a key with a tcl procedure.
 599  *
 600  * Tcl Command: viMapKey
 601  * Usage: viMapKey screenId key tclproc
 602  */
 603 static int
 604 tcl_map(clientData, interp, argc, argv)
 605         ClientData clientData;
 606         Tcl_Interp *interp;
 607         int argc;
 608         char **argv;
 609 {
 610         SCR *sp;
 611         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 612         int rval;
 613         char command[256];
 614
 615         if (argc != 4) {
 616                 Tcl_SetResult(interp,
 617                     "Usage: viMapKey screenId key tclproc", TCL_STATIC);
 618                 return (TCL_ERROR);
 619         }
 620
 621         if (getscreenid(interp, &sp, argv[1], NULL))
 622                 return (TCL_ERROR);
 623         INITMESSAGE;
 624         (void)snprintf(command, sizeof(command), ":tcl %s\n", argv[3]);
 625         rval = api_map(sp, argv[2], command, strlen(command));
 626         ENDMESSAGE;
 627
 628         return (rval ? TCL_ERROR : TCL_OK);
 629 }
 630
 631 /*
 632  * tcl_unmap --
 633  *      Unmap a key.
 634  *
 635  * Tcl Command: viUnmapKey
 636  * Usage: viUnmMapKey screenId key
 637  */
 638 static int
 639 tcl_unmap(clientData, interp, argc, argv)
 640         ClientData clientData;
 641         Tcl_Interp *interp;
 642         int argc;
 643         char **argv;
 644 {
 645         SCR *sp;
 646         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 647         int rval;
 648
 649         if (argc != 3) {
 650                 Tcl_SetResult(interp,
 651                     "Usage: viUnmapKey screenId key", TCL_STATIC);
 652                 return (TCL_ERROR);
 653         }
 654
 655         if (getscreenid(interp, &sp, argv[1], NULL))
 656                 return (TCL_ERROR);
 657         INITMESSAGE;
 658         rval = api_unmap(sp, argv[2]);
 659         ENDMESSAGE;
 660
 661         return (rval ? TCL_ERROR : TCL_OK);
 662 }
 663
 664 /*
 665  * tcl_opts_set --
 666  *      Set an option.
 667  *
 668  * Tcl Command: viSetOpt
 669  * Usage: viSetOpt screenId command
 670  */
 671 static int
 672 tcl_opts_set(clientData, interp, argc, argv)
 673         ClientData clientData;
 674         Tcl_Interp *interp;
 675         int argc;
 676         char **argv;
 677 {
 678         SCR *sp;
 679         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 680         int rval;
 681         char *setting;
 682
 683         if (argc != 3) {
 684                 Tcl_SetResult(interp,
 685                     "Usage: viSetOpt screenId command", TCL_STATIC);
 686                 return (TCL_ERROR);
 687         }
 688
 689         if (getscreenid(interp, &sp, argv[1], NULL))
 690                 return (TCL_ERROR);
 691         INITMESSAGE;
 692         /*rval = api_opts_set(sp, argv[2]);*/
 693         MALLOC(sp, setting, char *, strlen(argv[2])+6);
 694         strcpy(setting, ":set ");
 695         strcpy(setting+5, argv[2]);
 696         rval=api_run_str(sp, setting);
 697         free(setting);
 698         ENDMESSAGE;
 699
 700         return (rval ? TCL_ERROR : TCL_OK);
 701 }
 702
 703 /*
 704  * tcl_opts_get --
 705         Return the value of an option.
 706  *
 707  * Tcl Command: viGetOpt
 708  * Usage: viGetOpt screenId option
 709  */
 710 static int
 711 tcl_opts_get(clientData, interp, argc, argv)
 712         ClientData clientData;
 713         Tcl_Interp *interp;
 714         int argc;
 715         char **argv;
 716 {
 717         SCR *sp;
 718         void (*scr_msg) __P((SCR *, mtype_t, char *, size_t));
 719         int rval;
 720         char *value;
 721
 722         if (argc != 3) {
 723                 Tcl_SetResult(interp,
 724                     "Usage: viGetOpt screenId option", TCL_STATIC);
 725                 return (TCL_ERROR);
 726         }
 727
 728         if (getscreenid(interp, &sp, argv[1], NULL))
 729                 return (TCL_ERROR);
 730         INITMESSAGE;
 731         rval = api_opts_get(sp, argv[2], &value, NULL);
 732         ENDMESSAGE;
 733         if (rval)
 734                 return (TCL_ERROR);
 735
 736         Tcl_SetResult(interp, value, TCL_DYNAMIC);
 737         return (TCL_OK);
 738 }
 739
 740 /*
 741  * tcl_init --
 742  *      Create the TCL commands used by nvi.
 743  *
 744  * PUBLIC: int tcl_init __P((GS *));
 745  */
 746 int
 747 tcl_init(gp)
 748         GS *gp;
 749 {
 750         gp->tcl_interp = Tcl_CreateInterp();
 751         if (Tcl_Init(gp->tcl_interp) == TCL_ERROR)
 752                 return (1);
 753
 754 #define TCC(name, function) {                                           \
 755         Tcl_CreateCommand(gp->tcl_interp, name, function,               \
 756             (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);               \
 757 }
 758         TCC("viAppendLine", tcl_aline);
 759         TCC("viDelLine", tcl_dline);
 760         TCC("viEndScreen", tcl_escreen);
 761         TCC("viFindScreen", tcl_fscreen);
 762         TCC("viGetCursor", tcl_getcursor);
 763         TCC("viGetLine", tcl_gline);
 764         TCC("viGetMark", tcl_getmark);
 765         TCC("viGetOpt", tcl_opts_get);
 766         TCC("viInsertLine", tcl_iline);
 767         TCC("viLastLine", tcl_lline);
 768         TCC("viMapKey", tcl_map);
 769         TCC("viMsg", tcl_msg);
 770         TCC("viNewScreen", tcl_iscreen);
 771         TCC("viSetCursor", tcl_setcursor);
 772         TCC("viSetLine", tcl_sline);
 773         TCC("viSetMark", tcl_setmark);
 774         TCC("viSetOpt", tcl_opts_set);
 775         TCC("viSwitchScreen", tcl_swscreen);
 776         TCC("viUnmapKey", tcl_unmap);
 777
 778         return (0);
 779 }
 780
 781 /*
 782  * getscreenid --
 783  *      Get the specified screen pointer.
 784  *
 785  * XXX
 786  * This is fatal.  We can't post a message into vi that we're unable to find
 787  * the screen without first finding the screen... So, this must be the first
 788  * thing a Tcl routine does, and, if it fails, the last as well.
 789  */
 790 static int
 791 getscreenid(interp, spp, id, name)
 792         Tcl_Interp *interp;
 793         SCR **spp;
 794         char *id, *name;
 795 {
 796         int scr_no;
 797         char buf[64];
 798
 799         if (id != NULL && getint(interp, "screen id", id, &scr_no))
 800                 return (1);
 801         if ((*spp = api_fscreen(scr_no, name)) == NULL) {
 802                 (void)snprintf(buf, sizeof(buf),
 803                     "unknown screen id: %s", name == NULL ? id : name);
 804                 Tcl_SetResult(interp, buf, TCL_VOLATILE);
 805                 return (1);
 806         }
 807         return (0);
 808 }
 809
 810 /*
 811  * getint --
 812  *      Get a Tcl integer.
 813  *
 814  * XXX
 815  * This code assumes that both recno_t and size_t are larger than ints.
 816  */
 817 static int
 818 getint(interp, msg, s, intp)
 819         Tcl_Interp *interp;
 820         char *msg, *s;
 821         int *intp;
 822 {
 823         char buf[64];
 824
 825         if (Tcl_GetInt(interp, s, intp) == TCL_ERROR)
 826                 return (1);
 827         if (*intp < 0) {
 828                 (void)snprintf(buf, sizeof(buf),
 829                     "illegal %s %s: may not be negative", msg, s);
 830                 Tcl_SetResult(interp, buf, TCL_VOLATILE);
 831                 return (1);
 832         }
 833         return (0);
 834 }
 835
 836 /*
 837  * msghandler --
 838  *      Tcl message routine so that error messages are processed in
 839  *      Tcl, not in nvi.
 840  */
 841 static void
 842 msghandler(sp, mtype, msg, len)
 843         SCR *sp;
 844         mtype_t mtype;
 845         char *msg;
 846         size_t len;
 847 {
 848         /* Replace the trailing <newline> with an EOS. */
 849         msg[len - 1] = '\0';
 850
 851         Tcl_SetResult(sp->gp->tcl_interp, msg, TCL_VOLATILE);
 852 }