1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)proc.c 1.2 10/03/80"; 4 5 #include "whoami.h" 6 #ifdef OBJ 7 /* 8 * and the rest of the file 9 */ 10 #include "0.h" 11 #include "tree.h" 12 #include "opcode.h" 13 #include "objfmt.h" 14 15 /* 16 * The following array is used to determine which classes may be read 17 * from textfiles. It is indexed by the return value from classify. 18 */ 19 #define rdops(x) rdxxxx[(x)-(TFIRST)] 20 21 int rdxxxx[] = { 22 0, /* -7 file types */ 23 0, /* -6 record types */ 24 0, /* -5 array types */ 25 O_READE, /* -4 scalar types */ 26 0, /* -3 pointer types */ 27 0, /* -2 set types */ 28 0, /* -1 string types */ 29 0, /* 0 nil, no type */ 30 O_READE, /* 1 boolean */ 31 O_READC, /* 2 character */ 32 O_READ4, /* 3 integer */ 33 O_READ8 /* 4 real */ 34 }; 35 36 /* 37 * Proc handles procedure calls. 38 * Non-builtin procedures are "buck-passed" to func (with a flag 39 * indicating that they are actually procedures. 40 * builtin procedures are handled here. 41 */ 42 proc(r) 43 int *r; 44 { 45 register struct nl *p; 46 register int *alv, *al, op; 47 struct nl *filetype, *ap; 48 int argc, *argv, typ, fmtspec, strfmt, stkcnt, *file; 49 char fmt, format[20], *strptr; 50 int prec, field, strnglen, fmtlen, fmtstart, pu; 51 int *pua, *pui, *puz; 52 int i, j, k; 53 int itemwidth; 54 55 #define CONPREC 4 56 #define VARPREC 8 57 #define CONWIDTH 1 58 #define VARWIDTH 2 59 #define SKIP 16 60 61 /* 62 * Verify that the name is 63 * defined and is that of a 64 * procedure. 65 */ 66 p = lookup(r[2]); 67 if (p == NIL) { 68 rvlist(r[3]); 69 return; 70 } 71 if (p->class != PROC && p->class != FPROC) { 72 error("Can't call %s, its %s not a procedure", p->symbol, classes[p->class]); 73 rvlist(r[3]); 74 return; 75 } 76 argv = r[3]; 77 78 /* 79 * Call handles user defined 80 * procedures and functions. 81 */ 82 if (bn != 0) { 83 call(p, argv, PROC, bn); 84 return; 85 } 86 87 /* 88 * Call to built-in procedure. 89 * Count the arguments. 90 */ 91 argc = 0; 92 for (al = argv; al != NIL; al = al[2]) 93 argc++; 94 95 /* 96 * Switch on the operator 97 * associated with the built-in 98 * procedure in the namelist 99 */ 100 op = p->value[0] &~ NSTAND; 101 if (opt('s') && (p->value[0] & NSTAND)) { 102 standard(); 103 error("%s is a nonstandard procedure", p->symbol); 104 } 105 switch (op) { 106 107 case O_ABORT: 108 if (argc != 0) 109 error("null takes no arguments"); 110 return; 111 112 case O_FLUSH: 113 if (argc == 0) { 114 put(1, O_MESSAGE); 115 return; 116 } 117 if (argc != 1) { 118 error("flush takes at most one argument"); 119 return; 120 } 121 ap = stkrval(argv[1], NIL , RREQ ); 122 if (ap == NIL) 123 return; 124 if (ap->class != FILET) { 125 error("flush's argument must be a file, not %s", nameof(ap)); 126 return; 127 } 128 put(1, op); 129 return; 130 131 case O_MESSAGE: 132 case O_WRITEF: 133 case O_WRITLN: 134 /* 135 * Set up default file "output"'s type 136 */ 137 file = NIL; 138 filetype = nl+T1CHAR; 139 /* 140 * Determine the file implied 141 * for the write and generate 142 * code to make it the active file. 143 */ 144 if (op == O_MESSAGE) { 145 /* 146 * For message, all that matters 147 * is that the filetype is 148 * a character file. 149 * Thus "output" will suit us fine. 150 */ 151 put(1, O_MESSAGE); 152 } else if (argv != NIL && (al = argv[1])[0] != T_WEXP) { 153 /* 154 * If there is a first argument which has 155 * no write widths, then it is potentially 156 * a file name. 157 */ 158 codeoff(); 159 ap = stkrval(argv[1], NIL , RREQ ); 160 codeon(); 161 if (ap == NIL) 162 argv = argv[2]; 163 if (ap != NIL && ap->class == FILET) { 164 /* 165 * Got "write(f, ...", make 166 * f the active file, and save 167 * it and its type for use in 168 * processing the rest of the 169 * arguments to write. 170 */ 171 file = argv[1]; 172 filetype = ap->type; 173 stkrval(argv[1], NIL , RREQ ); 174 put(1, O_UNIT); 175 /* 176 * Skip over the first argument 177 */ 178 argv = argv[2]; 179 argc--; 180 } else 181 /* 182 * Set up for writing on 183 * standard output. 184 */ 185 put(1, O_UNITOUT); 186 } else 187 put(1, O_UNITOUT); 188 /* 189 * Loop and process each 190 * of the arguments. 191 */ 192 for (; argv != NIL; argv = argv[2]) { 193 /* 194 * fmtspec indicates the type (CONstant or VARiable) 195 * and number (none, WIDTH, and/or PRECision) 196 * of the fields in the printf format for this 197 * output variable. 198 * stkcnt is the number of longs pushed on the stack 199 * fmt is the format output indicator (D, E, F, O, X, S) 200 * fmtstart = 0 for leading blank; = 1 for no blank 201 */ 202 fmtspec = NIL; 203 stkcnt = 0; 204 fmt = 'D'; 205 fmtstart = 1; 206 al = argv[1]; 207 if (al == NIL) 208 continue; 209 if (al[0] == T_WEXP) 210 alv = al[1]; 211 else 212 alv = al; 213 if (alv == NIL) 214 continue; 215 codeoff(); 216 ap = stkrval(alv, NIL , RREQ ); 217 codeon(); 218 if (ap == NIL) 219 continue; 220 typ = classify(ap); 221 if (al[0] == T_WEXP) { 222 /* 223 * Handle width expressions. 224 * The basic game here is that width 225 * expressions get evaluated. If they 226 * are constant, the value is placed 227 * directly in the format string. 228 * Otherwise the value is pushed onto 229 * the stack and an indirection is 230 * put into the format string. 231 */ 232 if (al[3] == OCT) 233 fmt = 'O'; 234 else if (al[3] == HEX) 235 fmt = 'X'; 236 else if (al[3] != NIL) { 237 /* 238 * Evaluate second format spec 239 */ 240 if ( constval(al[3]) 241 && isa( con.ctype , "i" ) ) { 242 fmtspec += CONPREC; 243 prec = con.crval; 244 } else { 245 fmtspec += VARPREC; 246 } 247 fmt = 'f'; 248 switch ( typ ) { 249 case TINT: 250 if ( opt( 's' ) ) { 251 standard(); 252 error("Writing %ss with two write widths is non-standard", clnames[typ]); 253 } 254 /* and fall through */ 255 case TDOUBLE: 256 break; 257 default: 258 error("Cannot write %ss with two write widths", clnames[typ]); 259 continue; 260 } 261 } 262 /* 263 * Evaluate first format spec 264 */ 265 if (al[2] != NIL) { 266 if ( constval(al[2]) 267 && isa( con.ctype , "i" ) ) { 268 fmtspec += CONWIDTH; 269 field = con.crval; 270 } else { 271 fmtspec += VARWIDTH; 272 } 273 } 274 if ((fmtspec & CONPREC) && prec < 0 || 275 (fmtspec & CONWIDTH) && field < 0) { 276 error("Negative widths are not allowed"); 277 continue; 278 } 279 } 280 if (filetype != nl+T1CHAR) { 281 if (fmt == 'O' || fmt == 'X') { 282 error("Oct/hex allowed only on text files"); 283 continue; 284 } 285 if (fmtspec) { 286 error("Write widths allowed only on text files"); 287 continue; 288 } 289 /* 290 * Generalized write, i.e. 291 * to a non-textfile. 292 */ 293 stkrval(file, NIL , RREQ ); 294 put(1, O_FNIL); 295 /* 296 * file^ := ... 297 */ 298 ap = rvalue(argv[1], NIL); 299 if (ap == NIL) 300 continue; 301 if (incompat(ap, filetype, argv[1])) { 302 cerror("Type mismatch in write to non-text file"); 303 continue; 304 } 305 convert(ap, filetype); 306 put(2, O_AS, width(filetype)); 307 /* 308 * put(file) 309 */ 310 put(1, O_PUT); 311 continue; 312 } 313 /* 314 * Write to a textfile 315 * 316 * Evaluate the expression 317 * to be written. 318 */ 319 if (fmt == 'O' || fmt == 'X') { 320 if (opt('s')) { 321 standard(); 322 error("Oct and hex are non-standard"); 323 } 324 if (typ == TSTR || typ == TDOUBLE) { 325 error("Can't write %ss with oct/hex", clnames[typ]); 326 continue; 327 } 328 if (typ == TCHAR || typ == TBOOL) 329 typ = TINT; 330 } 331 /* 332 * Place the arguement on the stack. If there is 333 * no format specified by the programmer, implement 334 * the default. 335 */ 336 switch (typ) { 337 case TINT: 338 if (fmt != 'f') { 339 ap = stkrval(alv, NIL , RREQ ); 340 stkcnt++; 341 } else { 342 ap = stkrval(alv, NIL , RREQ ); 343 put(1, O_ITOD); 344 stkcnt += 2; 345 typ = TDOUBLE; 346 goto tdouble; 347 } 348 if (fmtspec == NIL) { 349 if (fmt == 'D') 350 field = 10; 351 else if (fmt == 'X') 352 field = 8; 353 else if (fmt == 'O') 354 field = 11; 355 else 356 panic("fmt1"); 357 fmtspec = CONWIDTH; 358 } 359 break; 360 case TCHAR: 361 tchar: 362 ap = stkrval(alv, NIL , RREQ ); 363 stkcnt++; 364 fmt = 'c'; 365 break; 366 case TSCAL: 367 if (opt('s')) { 368 standard(); 369 error("Writing scalars to text files is non-standard"); 370 } 371 case TBOOL: 372 stkrval(alv, NIL , RREQ ); 373 put(2, O_NAM, listnames(ap)); 374 stkcnt++; 375 fmt = 's'; 376 break; 377 case TDOUBLE: 378 ap = stkrval(alv, TDOUBLE , RREQ ); 379 stkcnt += 2; 380 tdouble: 381 switch (fmtspec) { 382 case NIL: 383 field = 21; 384 prec = 14; 385 fmt = 'E'; 386 fmtspec = CONWIDTH + CONPREC; 387 break; 388 case CONWIDTH: 389 if (--field < 1) 390 field = 1; 391 prec = field - 7; 392 if (prec < 1) 393 prec = 1; 394 fmtspec += CONPREC; 395 fmt = 'E'; 396 break; 397 case CONWIDTH + CONPREC: 398 case CONWIDTH + VARPREC: 399 if (--field < 1) 400 field = 1; 401 } 402 format[0] = ' '; 403 fmtstart = 0; 404 break; 405 case TSTR: 406 constval( alv ); 407 switch ( classify( con.ctype ) ) { 408 case TCHAR: 409 typ = TCHAR; 410 goto tchar; 411 case TSTR: 412 strptr = con.cpval; 413 for (strnglen = 0; *strptr++; strnglen++) /* void */; 414 strptr = con.cpval; 415 break; 416 default: 417 strnglen = width(ap); 418 break; 419 } 420 fmt = 's'; 421 strfmt = fmtspec; 422 if (fmtspec == NIL) { 423 fmtspec = SKIP; 424 break; 425 } 426 if (fmtspec & CONWIDTH) { 427 if (field <= strnglen) { 428 fmtspec = SKIP; 429 break; 430 } else 431 field -= strnglen; 432 } 433 /* 434 * push string to implement leading blank padding 435 */ 436 put(2, O_LVCON, 2); 437 putstr("", 0); 438 stkcnt++; 439 break; 440 default: 441 error("Can't write %ss to a text file", clnames[typ]); 442 continue; 443 } 444 /* 445 * If there is a variable precision, evaluate it onto 446 * the stack 447 */ 448 if (fmtspec & VARPREC) { 449 ap = stkrval(al[3], NIL , RREQ ); 450 if (ap == NIL) 451 continue; 452 if (isnta(ap,"i")) { 453 error("Second write width must be integer, not %s", nameof(ap)); 454 continue; 455 } 456 if ( opt( 't' ) ) { 457 put(3, O_MAX, 0, 0); 458 } 459 stkcnt++; 460 } 461 /* 462 * If there is a variable width, evaluate it onto 463 * the stack 464 */ 465 if (fmtspec & VARWIDTH) { 466 if ( ( typ == TDOUBLE && fmtspec == VARWIDTH ) 467 || typ == TSTR ) { 468 i = sizes[cbn].om_off -= sizeof(int); 469 if (i < sizes[cbn].om_max) 470 sizes[cbn].om_max = i; 471 put(2, O_LV | cbn << 8 + INDX, i); 472 } 473 ap = stkrval(al[2], NIL , RREQ ); 474 if (ap == NIL) 475 continue; 476 if (isnta(ap,"i")) { 477 error("First write width must be integer, not %s", nameof(ap)); 478 continue; 479 } 480 stkcnt++; 481 /* 482 * Perform special processing on widths based 483 * on data type 484 */ 485 switch (typ) { 486 case TDOUBLE: 487 if (fmtspec == VARWIDTH) { 488 fmt = 'E'; 489 put(1, O_AS4); 490 put(2, O_RV4 | cbn << 8 + INDX, i); 491 put(3, O_MAX, 8, 1); 492 put(2, O_RV4 | cbn << 8 + INDX, i); 493 stkcnt++; 494 fmtspec += VARPREC; 495 } 496 put(3, O_MAX, 1, 1); 497 break; 498 case TSTR: 499 put(1, O_AS4); 500 put(2, O_RV4 | cbn << 8 + INDX, i); 501 put(3, O_MAX, strnglen, 0); 502 break; 503 default: 504 if ( opt( 't' ) ) { 505 put(3, O_MAX, 0, 0); 506 } 507 break; 508 } 509 } 510 /* 511 * Generate the format string 512 */ 513 switch (fmtspec) { 514 default: 515 panic("fmt2"); 516 case NIL: 517 if (fmt == 'c') 518 put(1, O_WRITEC); 519 else { 520 sprintf(&format[1], "%%%c", fmt); 521 goto fmtgen; 522 } 523 case SKIP: 524 break; 525 case CONWIDTH: 526 sprintf(&format[1], "%%%1D%c", field, fmt); 527 goto fmtgen; 528 case VARWIDTH: 529 sprintf(&format[1], "%%*%c", fmt); 530 goto fmtgen; 531 case CONWIDTH + CONPREC: 532 sprintf(&format[1], "%%%1D.%1D%c", field, prec, fmt); 533 goto fmtgen; 534 case CONWIDTH + VARPREC: 535 sprintf(&format[1], "%%%1D.*%c", field, fmt); 536 goto fmtgen; 537 case VARWIDTH + CONPREC: 538 sprintf(&format[1], "%%*.%1D%c", prec, fmt); 539 goto fmtgen; 540 case VARWIDTH + VARPREC: 541 sprintf(&format[1], "%%*.*%c", fmt); 542 fmtgen: 543 fmtlen = lenstr(&format[fmtstart], 0); 544 put(2, O_LVCON, fmtlen); 545 putstr(&format[fmtstart], 0); 546 put(1, O_FILE); 547 stkcnt += 2; 548 put(2, O_WRITEF, stkcnt); 549 } 550 /* 551 * Write the string after its blank padding 552 */ 553 if (typ == TSTR) { 554 put(1, O_FILE); 555 put(2, O_CON24, 1); 556 if (strfmt & VARWIDTH) { 557 put(2, O_RV4 | cbn << 8 + INDX , i ); 558 put(2, O_MIN, strnglen); 559 } else { 560 if ((fmtspec & SKIP) && 561 (strfmt & CONWIDTH)) { 562 strnglen = field; 563 } 564 put(2, O_CON24, strnglen); 565 } 566 ap = stkrval(alv, NIL , RREQ ); 567 put(1, O_WRITES); 568 } 569 } 570 /* 571 * Done with arguments. 572 * Handle writeln and 573 * insufficent number of args. 574 */ 575 switch (p->value[0] &~ NSTAND) { 576 case O_WRITEF: 577 if (argc == 0) 578 error("Write requires an argument"); 579 break; 580 case O_MESSAGE: 581 if (argc == 0) 582 error("Message requires an argument"); 583 case O_WRITLN: 584 if (filetype != nl+T1CHAR) 585 error("Can't 'writeln' a non text file"); 586 put(1, O_WRITLN); 587 break; 588 } 589 return; 590 591 case O_READ4: 592 case O_READLN: 593 /* 594 * Set up default 595 * file "input". 596 */ 597 file = NIL; 598 filetype = nl+T1CHAR; 599 /* 600 * Determine the file implied 601 * for the read and generate 602 * code to make it the active file. 603 */ 604 if (argv != NIL) { 605 codeoff(); 606 ap = stkrval(argv[1], NIL , RREQ ); 607 codeon(); 608 if (ap == NIL) 609 argv = argv[2]; 610 if (ap != NIL && ap->class == FILET) { 611 /* 612 * Got "read(f, ...", make 613 * f the active file, and save 614 * it and its type for use in 615 * processing the rest of the 616 * arguments to read. 617 */ 618 file = argv[1]; 619 filetype = ap->type; 620 stkrval(argv[1], NIL , RREQ ); 621 put(1, O_UNIT); 622 argv = argv[2]; 623 argc--; 624 } else { 625 /* 626 * Default is read from 627 * standard input. 628 */ 629 put(1, O_UNITINP); 630 input->nl_flags |= NUSED; 631 } 632 } else { 633 put(1, O_UNITINP); 634 input->nl_flags |= NUSED; 635 } 636 /* 637 * Loop and process each 638 * of the arguments. 639 */ 640 for (; argv != NIL; argv = argv[2]) { 641 /* 642 * Get the address of the target 643 * on the stack. 644 */ 645 al = argv[1]; 646 if (al == NIL) 647 continue; 648 if (al[0] != T_VAR) { 649 error("Arguments to %s must be variables, not expressions", p->symbol); 650 continue; 651 } 652 ap = stklval(al, MOD|ASGN|NOUSE); 653 if (ap == NIL) 654 continue; 655 if (filetype != nl+T1CHAR) { 656 /* 657 * Generalized read, i.e. 658 * from a non-textfile. 659 */ 660 if (incompat(filetype, ap, argv[1] )) { 661 error("Type mismatch in read from non-text file"); 662 continue; 663 } 664 /* 665 * var := file ^; 666 */ 667 if (file != NIL) 668 stkrval(file, NIL , RREQ ); 669 else /* Magic */ 670 put(2, O_RV2, input->value[0]); 671 put(1, O_FNIL); 672 put(2, O_IND, width(filetype)); 673 convert(filetype, ap); 674 if (isa(ap, "bsci")) 675 rangechk(ap, ap); 676 put(2, O_AS, width(ap)); 677 /* 678 * get(file); 679 */ 680 put(1, O_GET); 681 continue; 682 } 683 typ = classify(ap); 684 op = rdops(typ); 685 if (op == NIL) { 686 error("Can't read %ss from a text file", clnames[typ]); 687 continue; 688 } 689 if (op != O_READE) 690 put(1, op); 691 else { 692 put(2, op, listnames(ap)); 693 if (opt('s')) { 694 standard(); 695 error("Reading of enumerated types is non-standard"); 696 } 697 } 698 /* 699 * Data read is on the stack. 700 * Assign it. 701 */ 702 if (op != O_READ8 && op != O_READE) 703 rangechk(ap, op == O_READC ? ap : nl+T4INT); 704 gen(O_AS2, O_AS2, width(ap), 705 op == O_READ8 ? 8 : op == O_READ4 ? 4 : 2); 706 } 707 /* 708 * Done with arguments. 709 * Handle readln and 710 * insufficient number of args. 711 */ 712 if (p->value[0] == O_READLN) { 713 if (filetype != nl+T1CHAR) 714 error("Can't 'readln' a non text file"); 715 put(1, O_READLN); 716 } 717 else if (argc == 0) 718 error("read requires an argument"); 719 return; 720 721 case O_GET: 722 case O_PUT: 723 if (argc != 1) { 724 error("%s expects one argument", p->symbol); 725 return; 726 } 727 ap = stkrval(argv[1], NIL , RREQ ); 728 if (ap == NIL) 729 return; 730 if (ap->class != FILET) { 731 error("Argument to %s must be a file, not %s", p->symbol, nameof(ap)); 732 return; 733 } 734 put(1, O_UNIT); 735 put(1, op); 736 return; 737 738 case O_RESET: 739 case O_REWRITE: 740 if (argc == 0 || argc > 2) { 741 error("%s expects one or two arguments", p->symbol); 742 return; 743 } 744 if (opt('s') && argc == 2) { 745 standard(); 746 error("Two argument forms of reset and rewrite are non-standard"); 747 } 748 ap = stklval(argv[1], MOD|NOUSE); 749 if (ap == NIL) 750 return; 751 if (ap->class != FILET) { 752 error("First argument to %s must be a file, not %s", p->symbol, nameof(ap)); 753 return; 754 } 755 if (argc == 2) { 756 /* 757 * Optional second argument 758 * is a string name of a 759 * UNIX (R) file to be associated. 760 */ 761 al = argv[2]; 762 al = stkrval(al[1], NOFLAGS , RREQ ); 763 if (al == NIL) 764 return; 765 if (classify(al) != TSTR) { 766 error("Second argument to %s must be a string, not %s", p->symbol, nameof(al)); 767 return; 768 } 769 strnglen = width(al); 770 } else { 771 put(2, O_CON24, NIL); 772 strnglen = 0; 773 } 774 put(2, O_CON24, strnglen); 775 put(2, O_CON24, text(ap) ? 0: width(ap->type)); 776 put(1, op); 777 return; 778 779 case O_NEW: 780 case O_DISPOSE: 781 if (argc == 0) { 782 error("%s expects at least one argument", p->symbol); 783 return; 784 } 785 ap = stklval(argv[1], op == O_NEW ? ( MOD | NOUSE ) : MOD ); 786 if (ap == NIL) 787 return; 788 if (ap->class != PTR) { 789 error("(First) argument to %s must be a pointer, not %s", p->symbol, nameof(ap)); 790 return; 791 } 792 ap = ap->type; 793 if (ap == NIL) 794 return; 795 argv = argv[2]; 796 if (argv != NIL) { 797 if (ap->class != RECORD) { 798 error("Record required when specifying variant tags"); 799 return; 800 } 801 for (; argv != NIL; argv = argv[2]) { 802 if (ap->ptr[NL_VARNT] == NIL) { 803 error("Too many tag fields"); 804 return; 805 } 806 if (!isconst(argv[1])) { 807 error("Second and successive arguments to %s must be constants", p->symbol); 808 return; 809 } 810 gconst(argv[1]); 811 if (con.ctype == NIL) 812 return; 813 if (incompat(con.ctype, (ap->ptr[NL_TAG])->type , NIL )) { 814 cerror("Specified tag constant type clashed with variant case selector type"); 815 return; 816 } 817 for (ap = ap->ptr[NL_VARNT]; ap != NIL; ap = ap->chain) 818 if (ap->range[0] == con.crval) 819 break; 820 if (ap == NIL) { 821 error("No variant case label value equals specified constant value"); 822 return; 823 } 824 ap = ap->ptr[NL_VTOREC]; 825 } 826 } 827 put(2, op, width(ap)); 828 return; 829 830 case O_DATE: 831 case O_TIME: 832 if (argc != 1) { 833 error("%s expects one argument", p->symbol); 834 return; 835 } 836 ap = stklval(argv[1], MOD|NOUSE); 837 if (ap == NIL) 838 return; 839 if (classify(ap) != TSTR || width(ap) != 10) { 840 error("Argument to %s must be a alfa, not %s", p->symbol, nameof(ap)); 841 return; 842 } 843 put(1, op); 844 return; 845 846 case O_HALT: 847 if (argc != 0) { 848 error("halt takes no arguments"); 849 return; 850 } 851 put(1, op); 852 noreach = 1; 853 return; 854 855 case O_ARGV: 856 if (argc != 2) { 857 error("argv takes two arguments"); 858 return; 859 } 860 ap = stkrval(argv[1], NIL , RREQ ); 861 if (ap == NIL) 862 return; 863 if (isnta(ap, "i")) { 864 error("argv's first argument must be an integer, not %s", nameof(ap)); 865 return; 866 } 867 al = argv[2]; 868 ap = stklval(al[1], MOD|NOUSE); 869 if (ap == NIL) 870 return; 871 if (classify(ap) != TSTR) { 872 error("argv's second argument must be a string, not %s", nameof(ap)); 873 return; 874 } 875 put(2, op, width(ap)); 876 return; 877 878 case O_STLIM: 879 if (argc != 1) { 880 error("stlimit requires one argument"); 881 return; 882 } 883 ap = stkrval(argv[1], NIL , RREQ ); 884 if (ap == NIL) 885 return; 886 if (isnta(ap, "i")) { 887 error("stlimit's argument must be an integer, not %s", nameof(ap)); 888 return; 889 } 890 if (width(ap) != 4) 891 put(1, O_STOI); 892 put(1, op); 893 return; 894 895 case O_REMOVE: 896 if (argc != 1) { 897 error("remove expects one argument"); 898 return; 899 } 900 ap = stkrval(argv[1], NOFLAGS , RREQ ); 901 if (ap == NIL) 902 return; 903 if (classify(ap) != TSTR) { 904 error("remove's argument must be a string, not %s", nameof(ap)); 905 return; 906 } 907 put(2, O_CON24, width(ap)); 908 put(1, op); 909 return; 910 911 case O_LLIMIT: 912 if (argc != 2) { 913 error("linelimit expects two arguments"); 914 return; 915 } 916 ap = stklval(argv[1], NOFLAGS|NOUSE); 917 if (ap == NIL) 918 return; 919 if (!text(ap)) { 920 error("linelimit's first argument must be a text file, not %s", nameof(ap)); 921 return; 922 } 923 al = argv[2]; 924 ap = stkrval(al[1], NIL , RREQ ); 925 if (ap == NIL) 926 return; 927 if (isnta(ap, "i")) { 928 error("linelimit's second argument must be an integer, not %s", nameof(ap)); 929 return; 930 } 931 put(1, op); 932 return; 933 case O_PAGE: 934 if (argc != 1) { 935 error("page expects one argument"); 936 return; 937 } 938 ap = stkrval(argv[1], NIL , RREQ ); 939 if (ap == NIL) 940 return; 941 if (!text(ap)) { 942 error("Argument to page must be a text file, not %s", nameof(ap)); 943 return; 944 } 945 put(1, O_UNIT); 946 put(1, op); 947 return; 948 949 case O_PACK: 950 if (argc != 3) { 951 error("pack expects three arguments"); 952 return; 953 } 954 pu = "pack(a,i,z)"; 955 pua = (al = argv)[1]; 956 pui = (al = al[2])[1]; 957 puz = (al = al[2])[1]; 958 goto packunp; 959 case O_UNPACK: 960 if (argc != 3) { 961 error("unpack expects three arguments"); 962 return; 963 } 964 pu = "unpack(z,a,i)"; 965 puz = (al = argv)[1]; 966 pua = (al = al[2])[1]; 967 pui = (al = al[2])[1]; 968 packunp: 969 ap = stkrval((int *) pui, NLNIL , RREQ ); 970 if (ap == NIL) 971 return; 972 ap = stklval(pua, op == O_PACK ? NOFLAGS : MOD|NOUSE); 973 if (ap == NIL) 974 return; 975 if (ap->class != ARRAY) { 976 error("%s requires a to be an unpacked array, not %s", pu, nameof(ap)); 977 return; 978 } 979 al = (struct nl *) stklval(puz, op == O_UNPACK ? NOFLAGS : MOD|NOUSE); 980 if (al->class != ARRAY) { 981 error("%s requires z to be a packed array, not %s", pu, nameof(ap)); 982 return; 983 } 984 if (al->type == NIL || ap->type == NIL) 985 return; 986 if (al->type != ap->type) { 987 error("%s requires a and z to be arrays of the same type", pu, nameof(ap)); 988 return; 989 } 990 k = width(al); 991 itemwidth = width(ap->type); 992 ap = ap->chain; 993 al = al->chain; 994 if (ap->chain != NIL || al->chain != NIL) { 995 error("%s requires a and z to be single dimension arrays", pu); 996 return; 997 } 998 if (ap == NIL || al == NIL) 999 return; 1000 /* 1001 * al is the range for z i.e. u..v 1002 * ap is the range for a i.e. m..n 1003 * i will be n-m+1 1004 * j will be v-u+1 1005 */ 1006 i = ap->range[1] - ap->range[0] + 1; 1007 j = al->range[1] - al->range[0] + 1; 1008 if (i < j) { 1009 error("%s cannot have more elements in a (%d) than in z (%d)", pu, j, i); 1010 return; 1011 } 1012 /* 1013 * get n-m-(v-u) and m for the interpreter 1014 */ 1015 i -= j; 1016 j = ap->range[0]; 1017 put(5, op, itemwidth , j, i, k); 1018 return; 1019 case 0: 1020 error("%s is an unimplemented 6400 extension", p->symbol); 1021 return; 1022 1023 default: 1024 panic("proc case"); 1025 } 1026 } 1027 #endif OBJ 1028