1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)proc.c 1.5 03/08/81"; 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 = stklval(argv[1], NIL , LREQ ); 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 stklval(argv[1], NIL , LREQ ); 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 stklval(file, NIL , LREQ ); 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 if (fmtspec == NIL) { 363 put(1, O_FILE); 364 ap = stkrval(alv, NIL , RREQ ); 365 put(1, O_WRITEC); 366 fmtspec = SKIP; 367 break; 368 } 369 ap = stkrval(alv, NIL , RREQ ); 370 stkcnt++; 371 fmt = 'c'; 372 break; 373 case TSCAL: 374 warning(); 375 if (opt('s')) { 376 standard(); 377 } 378 error("Writing scalars to text files is non-standard"); 379 case TBOOL: 380 stkrval(alv, NIL , RREQ ); 381 put(2, O_NAM, (long)listnames(ap)); 382 # ifdef PDP11 383 put(2, O_CON2, 0); /* long align ptr */ 384 # endif PDP11 385 stkcnt++; 386 fmt = 's'; 387 break; 388 case TDOUBLE: 389 ap = stkrval(alv, TDOUBLE , RREQ ); 390 stkcnt += 2; 391 tdouble: 392 switch (fmtspec) { 393 case NIL: 394 # ifdef DEC11 395 field = 21; 396 # else 397 field = 22; 398 # endif DEC11 399 prec = 14; 400 fmt = 'e'; 401 fmtspec = CONWIDTH + CONPREC; 402 break; 403 case CONWIDTH: 404 if (--field < 1) 405 field = 1; 406 # ifdef DEC11 407 prec = field - 7; 408 # else 409 prec = field - 8; 410 # endif DEC11 411 if (prec < 1) 412 prec = 1; 413 fmtspec += CONPREC; 414 fmt = 'e'; 415 break; 416 case CONWIDTH + CONPREC: 417 case CONWIDTH + VARPREC: 418 if (--field < 1) 419 field = 1; 420 } 421 format[0] = ' '; 422 fmtstart = 0; 423 break; 424 case TSTR: 425 constval( alv ); 426 switch ( classify( con.ctype ) ) { 427 case TCHAR: 428 typ = TCHAR; 429 goto tchar; 430 case TSTR: 431 strptr = con.cpval; 432 for (strnglen = 0; *strptr++; strnglen++) /* void */; 433 strptr = con.cpval; 434 break; 435 default: 436 strnglen = width(ap); 437 break; 438 } 439 fmt = 's'; 440 strfmt = fmtspec; 441 if (fmtspec == NIL) { 442 fmtspec = SKIP; 443 break; 444 } 445 if (fmtspec & CONWIDTH) { 446 if (field <= strnglen) { 447 fmtspec = SKIP; 448 break; 449 } else 450 field -= strnglen; 451 } 452 /* 453 * push string to implement leading blank padding 454 */ 455 put(2, O_LVCON, 2); 456 putstr("", 0); 457 # ifdef PDP11 458 put(2, O_CON2, 0); /* long align ptr */ 459 # endif PDP11 460 stkcnt++; 461 break; 462 default: 463 error("Can't write %ss to a text file", clnames[typ]); 464 continue; 465 } 466 /* 467 * If there is a variable precision, evaluate it onto 468 * the stack 469 */ 470 if (fmtspec & VARPREC) { 471 ap = stkrval(al[3], NIL , RREQ ); 472 if (ap == NIL) 473 continue; 474 if (isnta(ap,"i")) { 475 error("Second write width must be integer, not %s", nameof(ap)); 476 continue; 477 } 478 if ( opt( 't' ) ) { 479 put(3, O_MAX, 0, 0); 480 } 481 stkcnt++; 482 } 483 /* 484 * If there is a variable width, evaluate it onto 485 * the stack 486 */ 487 if (fmtspec & VARWIDTH) { 488 if ( ( typ == TDOUBLE && fmtspec == VARWIDTH ) 489 || typ == TSTR ) { 490 i = sizes[cbn].om_off -= sizeof(long); 491 if (i < sizes[cbn].om_max) 492 sizes[cbn].om_max = i; 493 put(2, O_LV | cbn << 8 + INDX, i); 494 } 495 ap = stkrval(al[2], NIL , RREQ ); 496 if (ap == NIL) 497 continue; 498 if (isnta(ap,"i")) { 499 error("First write width must be integer, not %s", nameof(ap)); 500 continue; 501 } 502 stkcnt++; 503 /* 504 * Perform special processing on widths based 505 * on data type 506 */ 507 switch (typ) { 508 case TDOUBLE: 509 if (fmtspec == VARWIDTH) { 510 fmt = 'e'; 511 put(1, O_AS4); 512 put(2, O_RV4 | cbn << 8 + INDX, i); 513 # ifdef DEC11 514 put(3, O_MAX, 8, 1); 515 # else 516 put(3, O_MAX, 9, 1); 517 # endif DEC11 518 put(2, O_RV4 | cbn << 8 + INDX, i); 519 stkcnt++; 520 fmtspec += VARPREC; 521 } 522 put(3, O_MAX, 1, 1); 523 break; 524 case TSTR: 525 put(1, O_AS4); 526 put(2, O_RV4 | cbn << 8 + INDX, i); 527 put(3, O_MAX, strnglen, 0); 528 break; 529 default: 530 if ( opt( 't' ) ) { 531 put(3, O_MAX, 0, 0); 532 } 533 break; 534 } 535 } 536 /* 537 * Generate the format string 538 */ 539 switch (fmtspec) { 540 default: 541 panic("fmt2"); 542 case SKIP: 543 break; 544 case NIL: 545 sprintf(&format[1], "%%%c", fmt); 546 goto fmtgen; 547 case CONWIDTH: 548 sprintf(&format[1], "%%%d%c", field, fmt); 549 goto fmtgen; 550 case VARWIDTH: 551 sprintf(&format[1], "%%*%c", fmt); 552 goto fmtgen; 553 case CONWIDTH + CONPREC: 554 sprintf(&format[1], "%%%d.%d%c", field, prec, fmt); 555 goto fmtgen; 556 case CONWIDTH + VARPREC: 557 sprintf(&format[1], "%%%d.*%c", field, fmt); 558 goto fmtgen; 559 case VARWIDTH + CONPREC: 560 sprintf(&format[1], "%%*.%d%c", prec, fmt); 561 goto fmtgen; 562 case VARWIDTH + VARPREC: 563 sprintf(&format[1], "%%*.*%c", fmt); 564 fmtgen: 565 fmtlen = lenstr(&format[fmtstart], 0); 566 put(2, O_LVCON, fmtlen); 567 putstr(&format[fmtstart], 0); 568 put(1, O_FILE); 569 stkcnt += 2; 570 put(2, O_WRITEF, stkcnt); 571 } 572 /* 573 * Write the string after its blank padding 574 */ 575 if (typ == TSTR) { 576 put(1, O_FILE); 577 put(2, O_CON24, 1); 578 if (strfmt & VARWIDTH) { 579 put(2, O_RV4 | cbn << 8 + INDX , i ); 580 put(2, O_MIN, strnglen); 581 } else { 582 if ((fmtspec & SKIP) && 583 (strfmt & CONWIDTH)) { 584 strnglen = field; 585 } 586 put(2, O_CON24, strnglen); 587 } 588 ap = stkrval(alv, NIL , RREQ ); 589 put(1, O_WRITES); 590 } 591 } 592 /* 593 * Done with arguments. 594 * Handle writeln and 595 * insufficent number of args. 596 */ 597 switch (p->value[0] &~ NSTAND) { 598 case O_WRITEF: 599 if (argc == 0) 600 error("Write requires an argument"); 601 break; 602 case O_MESSAGE: 603 if (argc == 0) 604 error("Message requires an argument"); 605 case O_WRITLN: 606 if (filetype != nl+T1CHAR) 607 error("Can't 'writeln' a non text file"); 608 put(1, O_WRITLN); 609 break; 610 } 611 return; 612 613 case O_READ4: 614 case O_READLN: 615 /* 616 * Set up default 617 * file "input". 618 */ 619 file = NIL; 620 filetype = nl+T1CHAR; 621 /* 622 * Determine the file implied 623 * for the read and generate 624 * code to make it the active file. 625 */ 626 if (argv != NIL) { 627 codeoff(); 628 ap = stkrval(argv[1], NIL , RREQ ); 629 codeon(); 630 if (ap == NIL) 631 argv = argv[2]; 632 if (ap != NIL && ap->class == FILET) { 633 /* 634 * Got "read(f, ...", make 635 * f the active file, and save 636 * it and its type for use in 637 * processing the rest of the 638 * arguments to read. 639 */ 640 file = argv[1]; 641 filetype = ap->type; 642 stklval(argv[1], NIL , LREQ ); 643 put(1, O_UNIT); 644 argv = argv[2]; 645 argc--; 646 } else { 647 /* 648 * Default is read from 649 * standard input. 650 */ 651 put(1, O_UNITINP); 652 input->nl_flags |= NUSED; 653 } 654 } else { 655 put(1, O_UNITINP); 656 input->nl_flags |= NUSED; 657 } 658 /* 659 * Loop and process each 660 * of the arguments. 661 */ 662 for (; argv != NIL; argv = argv[2]) { 663 /* 664 * Get the address of the target 665 * on the stack. 666 */ 667 al = argv[1]; 668 if (al == NIL) 669 continue; 670 if (al[0] != T_VAR) { 671 error("Arguments to %s must be variables, not expressions", p->symbol); 672 continue; 673 } 674 ap = stklval(al, MOD|ASGN|NOUSE); 675 if (ap == NIL) 676 continue; 677 if (filetype != nl+T1CHAR) { 678 /* 679 * Generalized read, i.e. 680 * from a non-textfile. 681 */ 682 if (incompat(filetype, ap, argv[1] )) { 683 error("Type mismatch in read from non-text file"); 684 continue; 685 } 686 /* 687 * var := file ^; 688 */ 689 if (file != NIL) 690 stklval(file, NIL , LREQ ); 691 else /* Magic */ 692 put(2, PTR_RV, (int)input->value[0]); 693 put(1, O_FNIL); 694 put(2, O_IND, width(filetype)); 695 convert(filetype, ap); 696 if (isa(ap, "bsci")) 697 rangechk(ap, ap); 698 put(2, O_AS, width(ap)); 699 /* 700 * get(file); 701 */ 702 put(1, O_GET); 703 continue; 704 } 705 typ = classify(ap); 706 op = rdops(typ); 707 if (op == NIL) { 708 error("Can't read %ss from a text file", clnames[typ]); 709 continue; 710 } 711 if (op != O_READE) 712 put(1, op); 713 else { 714 put(2, op, (long)listnames(ap)); 715 warning(); 716 if (opt('s')) { 717 standard(); 718 } 719 error("Reading scalars from text files is non-standard"); 720 } 721 /* 722 * Data read is on the stack. 723 * Assign it. 724 */ 725 if (op != O_READ8 && op != O_READE) 726 rangechk(ap, op == O_READC ? ap : nl+T4INT); 727 gen(O_AS2, O_AS2, width(ap), 728 op == O_READ8 ? 8 : op == O_READ4 ? 4 : 2); 729 } 730 /* 731 * Done with arguments. 732 * Handle readln and 733 * insufficient number of args. 734 */ 735 if (p->value[0] == O_READLN) { 736 if (filetype != nl+T1CHAR) 737 error("Can't 'readln' a non text file"); 738 put(1, O_READLN); 739 } 740 else if (argc == 0) 741 error("read requires an argument"); 742 return; 743 744 case O_GET: 745 case O_PUT: 746 if (argc != 1) { 747 error("%s expects one argument", p->symbol); 748 return; 749 } 750 ap = stklval(argv[1], NIL , LREQ ); 751 if (ap == NIL) 752 return; 753 if (ap->class != FILET) { 754 error("Argument to %s must be a file, not %s", p->symbol, nameof(ap)); 755 return; 756 } 757 put(1, O_UNIT); 758 put(1, op); 759 return; 760 761 case O_RESET: 762 case O_REWRITE: 763 if (argc == 0 || argc > 2) { 764 error("%s expects one or two arguments", p->symbol); 765 return; 766 } 767 if (opt('s') && argc == 2) { 768 standard(); 769 error("Two argument forms of reset and rewrite are non-standard"); 770 } 771 codeoff(); 772 ap = stklval(argv[1], MOD|NOUSE); 773 codeon(); 774 if (ap == NIL) 775 return; 776 if (ap->class != FILET) { 777 error("First argument to %s must be a file, not %s", p->symbol, nameof(ap)); 778 return; 779 } 780 put(2, O_CON24, text(ap) ? 0: width(ap->type)); 781 if (argc == 2) { 782 /* 783 * Optional second argument 784 * is a string name of a 785 * UNIX (R) file to be associated. 786 */ 787 al = argv[2]; 788 codeoff(); 789 al = stkrval(al[1], NOFLAGS , RREQ ); 790 codeon(); 791 if (al == NIL) 792 return; 793 if (classify(al) != TSTR) { 794 error("Second argument to %s must be a string, not %s", p->symbol, nameof(al)); 795 return; 796 } 797 put(2, O_CON24, width(al)); 798 al = argv[2]; 799 al = stkrval(al[1], NOFLAGS , RREQ ); 800 } else { 801 put(2, O_CON24, 0); 802 put(2, PTR_CON, NIL); 803 } 804 ap = stklval(argv[1], MOD|NOUSE); 805 put(1, op); 806 return; 807 808 case O_NEW: 809 case O_DISPOSE: 810 if (argc == 0) { 811 error("%s expects at least one argument", p->symbol); 812 return; 813 } 814 ap = stklval(argv[1], op == O_NEW ? ( MOD | NOUSE ) : MOD ); 815 if (ap == NIL) 816 return; 817 if (ap->class != PTR) { 818 error("(First) argument to %s must be a pointer, not %s", p->symbol, nameof(ap)); 819 return; 820 } 821 ap = ap->type; 822 if (ap == NIL) 823 return; 824 argv = argv[2]; 825 if (argv != NIL) { 826 if (ap->class != RECORD) { 827 error("Record required when specifying variant tags"); 828 return; 829 } 830 for (; argv != NIL; argv = argv[2]) { 831 if (ap->ptr[NL_VARNT] == NIL) { 832 error("Too many tag fields"); 833 return; 834 } 835 if (!isconst(argv[1])) { 836 error("Second and successive arguments to %s must be constants", p->symbol); 837 return; 838 } 839 gconst(argv[1]); 840 if (con.ctype == NIL) 841 return; 842 if (incompat(con.ctype, (ap->ptr[NL_TAG])->type , NIL )) { 843 cerror("Specified tag constant type clashed with variant case selector type"); 844 return; 845 } 846 for (ap = ap->ptr[NL_VARNT]; ap != NIL; ap = ap->chain) 847 if (ap->range[0] == con.crval) 848 break; 849 if (ap == NIL) { 850 error("No variant case label value equals specified constant value"); 851 return; 852 } 853 ap = ap->ptr[NL_VTOREC]; 854 } 855 } 856 put(2, op, width(ap)); 857 return; 858 859 case O_DATE: 860 case O_TIME: 861 if (argc != 1) { 862 error("%s expects one argument", p->symbol); 863 return; 864 } 865 ap = stklval(argv[1], MOD|NOUSE); 866 if (ap == NIL) 867 return; 868 if (classify(ap) != TSTR || width(ap) != 10) { 869 error("Argument to %s must be a alfa, not %s", p->symbol, nameof(ap)); 870 return; 871 } 872 put(1, op); 873 return; 874 875 case O_HALT: 876 if (argc != 0) { 877 error("halt takes no arguments"); 878 return; 879 } 880 put(1, op); 881 noreach = 1; 882 return; 883 884 case O_ARGV: 885 if (argc != 2) { 886 error("argv takes two arguments"); 887 return; 888 } 889 ap = stkrval(argv[1], NIL , RREQ ); 890 if (ap == NIL) 891 return; 892 if (isnta(ap, "i")) { 893 error("argv's first argument must be an integer, not %s", nameof(ap)); 894 return; 895 } 896 al = argv[2]; 897 ap = stklval(al[1], MOD|NOUSE); 898 if (ap == NIL) 899 return; 900 if (classify(ap) != TSTR) { 901 error("argv's second argument must be a string, not %s", nameof(ap)); 902 return; 903 } 904 put(2, op, width(ap)); 905 return; 906 907 case O_STLIM: 908 if (argc != 1) { 909 error("stlimit requires one argument"); 910 return; 911 } 912 ap = stkrval(argv[1], NIL , RREQ ); 913 if (ap == NIL) 914 return; 915 if (isnta(ap, "i")) { 916 error("stlimit's argument must be an integer, not %s", nameof(ap)); 917 return; 918 } 919 if (width(ap) != 4) 920 put(1, O_STOI); 921 put(1, op); 922 return; 923 924 case O_REMOVE: 925 if (argc != 1) { 926 error("remove expects one argument"); 927 return; 928 } 929 codeoff(); 930 ap = stkrval(argv[1], NOFLAGS , RREQ ); 931 codeon(); 932 if (ap == NIL) 933 return; 934 if (classify(ap) != TSTR) { 935 error("remove's argument must be a string, not %s", nameof(ap)); 936 return; 937 } 938 put(2, O_CON24, width(ap)); 939 ap = stkrval(argv[1], NOFLAGS , RREQ ); 940 put(1, op); 941 return; 942 943 case O_LLIMIT: 944 if (argc != 2) { 945 error("linelimit expects two arguments"); 946 return; 947 } 948 al = argv[2]; 949 ap = stkrval(al[1], NIL , RREQ ); 950 if (ap == NIL) 951 return; 952 if (isnta(ap, "i")) { 953 error("linelimit's second argument must be an integer, not %s", nameof(ap)); 954 return; 955 } 956 ap = stklval(argv[1], NOFLAGS|NOUSE); 957 if (ap == NIL) 958 return; 959 if (!text(ap)) { 960 error("linelimit's first argument must be a text file, not %s", nameof(ap)); 961 return; 962 } 963 put(1, op); 964 return; 965 case O_PAGE: 966 if (argc != 1) { 967 error("page expects one argument"); 968 return; 969 } 970 ap = stklval(argv[1], NIL , LREQ ); 971 if (ap == NIL) 972 return; 973 if (!text(ap)) { 974 error("Argument to page must be a text file, not %s", nameof(ap)); 975 return; 976 } 977 put(1, O_UNIT); 978 put(1, op); 979 return; 980 981 case O_PACK: 982 if (argc != 3) { 983 error("pack expects three arguments"); 984 return; 985 } 986 pu = "pack(a,i,z)"; 987 pua = argv[1]; 988 al = argv[2]; 989 pui = al[1]; 990 alv = al[2]; 991 puz = alv[1]; 992 goto packunp; 993 case O_UNPACK: 994 if (argc != 3) { 995 error("unpack expects three arguments"); 996 return; 997 } 998 pu = "unpack(z,a,i)"; 999 puz = argv[1]; 1000 al = argv[2]; 1001 pua = al[1]; 1002 alv = al[2]; 1003 pui = alv[1]; 1004 packunp: 1005 codeoff(); 1006 ap = stklval(pua, op == O_PACK ? NOFLAGS : MOD|NOUSE); 1007 al = (struct nl *) stklval(puz, op == O_UNPACK ? NOFLAGS : MOD|NOUSE); 1008 codeon(); 1009 if (ap == NIL) 1010 return; 1011 if (ap->class != ARRAY) { 1012 error("%s requires a to be an unpacked array, not %s", pu, nameof(ap)); 1013 return; 1014 } 1015 if (al->class != ARRAY) { 1016 error("%s requires z to be a packed array, not %s", pu, nameof(ap)); 1017 return; 1018 } 1019 if (al->type == NIL || ap->type == NIL) 1020 return; 1021 if (al->type != ap->type) { 1022 error("%s requires a and z to be arrays of the same type", pu, nameof(ap)); 1023 return; 1024 } 1025 k = width(al); 1026 itemwidth = width(ap->type); 1027 ap = ap->chain; 1028 al = al->chain; 1029 if (ap->chain != NIL || al->chain != NIL) { 1030 error("%s requires a and z to be single dimension arrays", pu); 1031 return; 1032 } 1033 if (ap == NIL || al == NIL) 1034 return; 1035 /* 1036 * al is the range for z i.e. u..v 1037 * ap is the range for a i.e. m..n 1038 * i will be n-m+1 1039 * j will be v-u+1 1040 */ 1041 i = ap->range[1] - ap->range[0] + 1; 1042 j = al->range[1] - al->range[0] + 1; 1043 if (i < j) { 1044 error("%s cannot have more elements in a (%d) than in z (%d)", pu, j, i); 1045 return; 1046 } 1047 /* 1048 * get n-m-(v-u) and m for the interpreter 1049 */ 1050 i -= j; 1051 j = ap->range[0]; 1052 put(2, O_CON24, k); 1053 put(2, O_CON24, i); 1054 put(2, O_CON24, j); 1055 put(2, O_CON24, itemwidth); 1056 al = (struct nl *) stklval(puz, op == O_UNPACK ? NOFLAGS : MOD|NOUSE); 1057 ap = stklval(pua, op == O_PACK ? NOFLAGS : MOD|NOUSE); 1058 ap = stkrval((int *) pui, NLNIL , RREQ ); 1059 if (ap == NIL) 1060 return; 1061 put(1, op); 1062 return; 1063 case 0: 1064 error("%s is an unimplemented 6400 extension", p->symbol); 1065 return; 1066 1067 default: 1068 panic("proc case"); 1069 } 1070 } 1071 #endif OBJ 1072