| 1 | |
| 2 | # include "global.h" |
| 3 | # include <sgtty.h> |
| 4 | # include "chkrtab.h" |
| 5 | /**************************************************************************/ |
| 6 | /* */ |
| 7 | /* file: ccdfns.i */ |
| 8 | /* contents: LISP functions coded in C */ |
| 9 | /* */ |
| 10 | /* These include LISP primitives, numeric and boolean functions and */ |
| 11 | /* predicates, some list-processing functions, i/o support functions */ |
| 12 | /* and control flow functions (e.g. cont, break). */ |
| 13 | /* There are two types of functions: lambda (prefixed "L") and nlambda */ |
| 14 | /* (prefixed "N"). */ |
| 15 | /* Lambda's all call chkarg to insure that at least the minimum number */ |
| 16 | /* of necessary arguments are on the namestack. */ |
| 17 | /* All functions take their arguments from the namestack in a read- */ |
| 18 | /* only manner, and return their results via the normal C value */ |
| 19 | /* return mechanism. */ |
| 20 | /* */ |
| 21 | |
| 22 | |
| 23 | |
| 24 | lispval |
| 25 | Leval() |
| 26 | { |
| 27 | register lispval temp; |
| 28 | |
| 29 | chkarg(1); |
| 30 | temp = lbot->val; |
| 31 | return(eval(temp)); |
| 32 | } |
| 33 | |
| 34 | lispval |
| 35 | Lxcar() |
| 36 | { register int typ; |
| 37 | register lispval temp, result; |
| 38 | |
| 39 | chkarg(1); |
| 40 | temp = lbot->val; |
| 41 | if (((typ = TYPE(temp)) == DTPR) || (typ == ATOM)) |
| 42 | return(temp -> car); |
| 43 | else if(typ == SDOT) { |
| 44 | result = inewint(temp->i); |
| 45 | return(result); |
| 46 | } else if(Schainp!=nil && typ==ATOM) |
| 47 | return(nil); |
| 48 | else |
| 49 | return(error("BAD ARG TO CAR",FALSE)); |
| 50 | |
| 51 | } |
| 52 | |
| 53 | lispval |
| 54 | Lxcdr() |
| 55 | { register int typ; |
| 56 | register lispval temp, result; |
| 57 | |
| 58 | chkarg(1); |
| 59 | temp = lbot->val; |
| 60 | if(temp==nil) return (nil); |
| 61 | |
| 62 | if ((typ = TYPE(temp)) == DTPR) |
| 63 | return(temp -> cdr); |
| 64 | else if(typ==SDOT) { |
| 65 | if(temp->CDR==0) return(nil); |
| 66 | return(temp->CDR); |
| 67 | } else if(Schainp!=nil && typ==ATOM) |
| 68 | return(nil); |
| 69 | else |
| 70 | return(error("BAD ARG TO CDR",FALSE)); |
| 71 | } |
| 72 | |
| 73 | lispval |
| 74 | cxxr(as,ds) |
| 75 | register int as,ds; |
| 76 | { |
| 77 | |
| 78 | register lispval temp, temp2; |
| 79 | int i, typ; |
| 80 | lispval errorh(); |
| 81 | |
| 82 | chkarg(1); |
| 83 | temp = lbot->val; |
| 84 | |
| 85 | for( i=0 ; i<ds ; i++) |
| 86 | { |
| 87 | if( temp != nil) |
| 88 | { |
| 89 | if ((typ = TYPE(temp)) == DTPR) |
| 90 | temp = temp -> cdr; |
| 91 | else if(typ==SDOT) { |
| 92 | if(temp->CDR==0) temp = nil; |
| 93 | else temp = temp->CDR; |
| 94 | } |
| 95 | else if(Schainp!=nil && typ==ATOM) |
| 96 | return(nil); |
| 97 | else |
| 98 | return(errorh(Vermisc,"BAD ARG TO CDR",nil,FALSE,5,temp)); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | for( i=0 ; i<as ; i++) |
| 103 | { |
| 104 | if( temp != nil ) |
| 105 | { |
| 106 | if ((typ = TYPE(temp)) == DTPR) |
| 107 | temp = temp -> car; |
| 108 | else if(typ == SDOT) |
| 109 | temp2 = inewint(temp->i), temp = temp2; |
| 110 | else if(Schainp!=nil && typ==ATOM) |
| 111 | return(nil); |
| 112 | else |
| 113 | return(errorh(Vermisc,"BAD ARG TO CAR",nil,FALSE,5,temp)); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | return(temp); |
| 118 | } |
| 119 | |
| 120 | |
| 121 | lispval |
| 122 | Lcar() |
| 123 | { return(cxxr(1,0)); |
| 124 | } |
| 125 | |
| 126 | lispval |
| 127 | Lcdr() |
| 128 | { return(cxxr(0,1)); |
| 129 | } |
| 130 | |
| 131 | lispval |
| 132 | Lcadr() |
| 133 | { return(cxxr(1,1)); |
| 134 | } |
| 135 | |
| 136 | lispval |
| 137 | Lcaar() |
| 138 | { return(cxxr(2,0)); |
| 139 | } |
| 140 | |
| 141 | lispval |
| 142 | Lc02r() |
| 143 | { return(cxxr(0,2)); /* cddr */ |
| 144 | } |
| 145 | |
| 146 | lispval |
| 147 | Lc12r() |
| 148 | { return(cxxr(1,2)); /* caddr */ |
| 149 | } |
| 150 | |
| 151 | lispval |
| 152 | Lc03r() |
| 153 | { return(cxxr(0,3)); /* cdddr */ |
| 154 | } |
| 155 | |
| 156 | lispval |
| 157 | Lc13r() |
| 158 | { return(cxxr(1,3)); /* cadddr */ |
| 159 | } |
| 160 | |
| 161 | lispval |
| 162 | Lc04r() |
| 163 | { return(cxxr(0,4)); /* cddddr */ |
| 164 | } |
| 165 | |
| 166 | lispval |
| 167 | Lc14r() |
| 168 | { return(cxxr(1,4)); /* caddddr */ |
| 169 | } |
| 170 | |
| 171 | /************************* |
| 172 | * |
| 173 | * (nthelem num list) |
| 174 | * returns the num'th element of the list, by doing a caddddd...ddr |
| 175 | * where there are num-1 d's |
| 176 | * if num<=0 or greater than the length of the list, we return nil |
| 177 | ******************************************************/ |
| 178 | |
| 179 | lispval |
| 180 | Lnthelem() |
| 181 | { |
| 182 | register lispval temp; |
| 183 | register int i; |
| 184 | |
| 185 | chkarg(2); |
| 186 | |
| 187 | if( TYPE(temp = lbot->val) != INT) |
| 188 | return (error ("First arg to nthelem must be a fixnum",FALSE)); |
| 189 | |
| 190 | i = temp->i; /* pick up the first arg */ |
| 191 | |
| 192 | if( i <= 0) return(nil); |
| 193 | |
| 194 | ++lbot; /* fix lbot for call to cxxr() 'cadddd..r' */ |
| 195 | temp = cxxr(1,i-1); |
| 196 | --lbot; |
| 197 | |
| 198 | return(temp); |
| 199 | } |
| 200 | |
| 201 | |
| 202 | |
| 203 | |
| 204 | |
| 205 | lispval |
| 206 | Lscons() |
| 207 | { |
| 208 | register struct argent *argp = lbot; |
| 209 | register lispval retp, handy; |
| 210 | register int typ; |
| 211 | |
| 212 | chkarg(2); |
| 213 | retp = newsdot(); |
| 214 | handy = (argp) -> val; |
| 215 | if(TYPE(handy)!=INT) |
| 216 | error("First arg to scons must be an int.",FALSE); |
| 217 | retp->I = handy->i; |
| 218 | handy = (argp+1)->val; |
| 219 | if(handy==nil) |
| 220 | retp->CDR = (lispval) 0; |
| 221 | else { |
| 222 | if(TYPE(handy)!=SDOT) |
| 223 | error("Currently you may only link sdots to sdots.",FALSE); |
| 224 | retp->CDR = handy; |
| 225 | } |
| 226 | return(retp); |
| 227 | } |
| 228 | lispval |
| 229 | Lcons() |
| 230 | { register struct argent *argp; |
| 231 | lispval retp; |
| 232 | |
| 233 | chkarg(2); |
| 234 | retp = newdot(); |
| 235 | retp -> cdr = ((argp = np-1) -> val); |
| 236 | retp -> car = (--argp) -> val; |
| 237 | return(retp); |
| 238 | } |
| 239 | #define CA 0 |
| 240 | #define CD 1 |
| 241 | |
| 242 | lispval |
| 243 | rpla(what) |
| 244 | int what; |
| 245 | { register struct argent *argp; |
| 246 | register int typ; register lispval first, second; |
| 247 | |
| 248 | chkarg(2); |
| 249 | argp = np-1; |
| 250 | first = (argp-1)->val; |
| 251 | while(first==nil) |
| 252 | first = error("Attempt to rplac[ad] nil.",TRUE); |
| 253 | second = argp->val; |
| 254 | if (((typ = TYPE(first)) == DTPR) || (typ == ATOM)) { |
| 255 | if (what == CA) |
| 256 | first->car = second; |
| 257 | else |
| 258 | first->cdr = second; |
| 259 | return(first); |
| 260 | } |
| 261 | if (typ==SDOT) { |
| 262 | if(what == CA) { |
| 263 | typ = TYPE(second); |
| 264 | if(typ!=INT) error("Rplacca of a bignum will only replace INTS",FALSE); |
| 265 | first->i = second->i; |
| 266 | } else { |
| 267 | if(second==nil) |
| 268 | first->CDR = (lispval) 0; |
| 269 | else |
| 270 | first->CDR = second; |
| 271 | } |
| 272 | return(first); |
| 273 | } |
| 274 | return(error("BAD ARG TO RPLA",FALSE)); |
| 275 | } |
| 276 | lispval |
| 277 | Lrplaca() |
| 278 | { return(rpla(CA)); } |
| 279 | |
| 280 | lispval |
| 281 | Lrplacd() |
| 282 | { return(rpla(CD)); } |
| 283 | |
| 284 | |
| 285 | lispval |
| 286 | Leq() |
| 287 | { |
| 288 | register struct argent *mynp = lbot + AD; |
| 289 | int itemp, flag; |
| 290 | |
| 291 | chkarg(2); |
| 292 | if(mynp->val==(mynp+1)->val) return(tatom); |
| 293 | return(nil); |
| 294 | } |
| 295 | |
| 296 | |
| 297 | |
| 298 | lispval |
| 299 | Lnull() |
| 300 | { chkarg(1); |
| 301 | return ((lbot->val == nil) ? tatom : nil); |
| 302 | } |
| 303 | |
| 304 | |
| 305 | |
| 306 | /* Lreturn **************************************************************/ |
| 307 | /* Returns the first argument - which is nill if not specified. */ |
| 308 | Lreturn() |
| 309 | { |
| 310 | chkarg(1); |
| 311 | contval = lbot->val; |
| 312 | reset(BRRETN); |
| 313 | } |
| 314 | |
| 315 | |
| 316 | /* Lretbrk **************************************************************/ |
| 317 | /* The first argument must be an integer and must be in the range */ |
| 318 | /* -1 .. -depth. */ |
| 319 | lispval |
| 320 | Lretbrk() |
| 321 | { |
| 322 | lispval number; |
| 323 | register level; |
| 324 | |
| 325 | |
| 326 | chkarg(1); |
| 327 | number = lbot->val; |
| 328 | if (TYPE(number) != INT) |
| 329 | level = -1; |
| 330 | else |
| 331 | level = number->i; |
| 332 | if(level < 0) |
| 333 | level += depth; |
| 334 | contval = (lispval) level; |
| 335 | if (level < depth) |
| 336 | reset(BRRETB); |
| 337 | return(nil); |
| 338 | } |
| 339 | |
| 340 | |
| 341 | |
| 342 | lispval |
| 343 | Linfile() |
| 344 | { |
| 345 | FILE *port; |
| 346 | register lispval name; |
| 347 | snpand(1); |
| 348 | |
| 349 | chkarg(1); |
| 350 | name = lbot->val; |
| 351 | while (TYPE(name)!=ATOM) |
| 352 | name = error("Please supply atom name for port.",TRUE); |
| 353 | /* return nil if file couldnt be opened |
| 354 | if ((port = fopen(name->pname,"r")) == NULL) return(nil); */ |
| 355 | |
| 356 | while ((port = fopen(name->pname,"r")) == NULL) |
| 357 | name = errorh(Vermisc,"Unable to open file for reading.",nil,TRUE,31,name); |
| 358 | |
| 359 | return((lispval)(xports + (port - _iob))); |
| 360 | } |
| 361 | |
| 362 | lispval |
| 363 | Loutfile() |
| 364 | { |
| 365 | FILE *port; register lispval name; |
| 366 | |
| 367 | chkarg(1); |
| 368 | name = lbot->val; |
| 369 | while (TYPE(name)!=ATOM) |
| 370 | name = error("Please supply atom name for port.",TRUE); |
| 371 | while ((port = fopen(name->pname,"w")) == NULL) |
| 372 | name = errorh(Vermisc,"Unable to open file for writing.",nil,TRUE,31,name); |
| 373 | return((lispval)(xports + (port - _iob))); |
| 374 | } |
| 375 | lispval |
| 376 | Lterpr() |
| 377 | { |
| 378 | FILE *port; |
| 379 | |
| 380 | chkarg(1); |
| 381 | port = okport(lbot->val,okport(Vpoport->clb,stdout)); |
| 382 | putc('\n',port); |
| 383 | fflush(port); |
| 384 | return(nil); |
| 385 | } |
| 386 | lispval |
| 387 | Lclose() |
| 388 | { |
| 389 | lispval port; |
| 390 | |
| 391 | if(lbot==np) |
| 392 | port = error("Close requires one argument of type port",TRUE); |
| 393 | port = lbot->val; |
| 394 | if((TYPE(port))==PORT) fclose(port->p); |
| 395 | return(tatom); |
| 396 | } |
| 397 | |
| 398 | lispval |
| 399 | Lnwritn() |
| 400 | { |
| 401 | register FILE *port; |
| 402 | register value; |
| 403 | |
| 404 | chkarg(1); |
| 405 | port = okport(lbot->val,okport(Vpoport->clb,stdout)); |
| 406 | value = port->_ptr - port->_base; |
| 407 | return(inewint(value)); |
| 408 | } |
| 409 | |
| 410 | lispval |
| 411 | Ldrain() |
| 412 | { |
| 413 | register FILE *port; |
| 414 | register int iodes; |
| 415 | struct sgttyb arg; |
| 416 | |
| 417 | chkarg(1); |
| 418 | port = okport(lbot->val, okport(Vpoport->clb,stdout)); |
| 419 | if(port->_flag & _IOWRT) { |
| 420 | fflush(port); |
| 421 | return(nil); |
| 422 | } |
| 423 | if(! port->_flag & _IOREAD) return(nil); |
| 424 | port->_cnt = 0; |
| 425 | port->_ptr = port->_base; |
| 426 | iodes = fileno(port); |
| 427 | if(gtty(iodes,&arg) != -1) stty(iodes,&arg); |
| 428 | return((lispval)(xports + (port - _iob))); |
| 429 | } |
| 430 | lispval |
| 431 | Llist() |
| 432 | { |
| 433 | /* added for the benefit of mapping functions. */ |
| 434 | register struct argent *ulim, *namptr; |
| 435 | register lispval temp, result; |
| 436 | register struct argent *lbot, *np; |
| 437 | |
| 438 | ulim = np; |
| 439 | namptr = lbot + AD; |
| 440 | temp = result = (lispval) np; |
| 441 | protect(nil); |
| 442 | for(; namptr < ulim;) { |
| 443 | temp = temp->l = newdot(); |
| 444 | temp->car = (namptr++)->val; |
| 445 | } |
| 446 | temp->l = nil; |
| 447 | return(result->l); |
| 448 | } |
| 449 | |
| 450 | lispval |
| 451 | Lnumberp() |
| 452 | { |
| 453 | chkarg(1); |
| 454 | switch(TYPE(lbot->val)) { |
| 455 | case INT: case DOUB: case SDOT: |
| 456 | return(tatom); |
| 457 | } |
| 458 | return(nil); |
| 459 | } |
| 460 | |
| 461 | lispval |
| 462 | Latom() |
| 463 | { |
| 464 | chkarg(1); |
| 465 | if(TYPE(lbot->val)==DTPR) |
| 466 | return(nil); |
| 467 | else |
| 468 | return(tatom); |
| 469 | } |
| 470 | lispval |
| 471 | Ltype() |
| 472 | { |
| 473 | chkarg(1); |
| 474 | switch(TYPE(lbot->val)) { |
| 475 | case INT: |
| 476 | return(int_name); |
| 477 | case ATOM: |
| 478 | return(atom_name); |
| 479 | case SDOT: |
| 480 | return(sdot_name); |
| 481 | case DOUB: |
| 482 | return(doub_name); |
| 483 | case DTPR: |
| 484 | return(dtpr_name); |
| 485 | case STRNG: |
| 486 | return(str_name); |
| 487 | case ARRAY: |
| 488 | return(array_name); |
| 489 | case BCD: |
| 490 | return(funct_name); |
| 491 | case VALUE: |
| 492 | return(val_name); |
| 493 | case PORT: |
| 494 | return(matom("port")); /* fix this when name exists */ |
| 495 | } |
| 496 | return(nil); |
| 497 | } |
| 498 | |
| 499 | lispval |
| 500 | Ldtpr() |
| 501 | { |
| 502 | chkarg(1); |
| 503 | return(typred(DTPR,lbot->val)); |
| 504 | } |
| 505 | |
| 506 | lispval |
| 507 | Lbcdp() |
| 508 | { |
| 509 | chkarg(1); |
| 510 | return(typred(BCD,lbot->val)); |
| 511 | } |
| 512 | |
| 513 | lispval |
| 514 | Lportp() |
| 515 | { |
| 516 | chkarg(1); |
| 517 | return(typred(PORT,lbot->val)); |
| 518 | } |
| 519 | |
| 520 | lispval |
| 521 | Larrayp() |
| 522 | { |
| 523 | chkarg(1); |
| 524 | return(typred(ARRAY,lbot->val)); |
| 525 | } |
| 526 | lispval |
| 527 | Lset() |
| 528 | { |
| 529 | lispval varble; |
| 530 | snpand(0); |
| 531 | |
| 532 | chkarg(2); |
| 533 | varble = lbot->val; |
| 534 | switch(TYPE(varble)) |
| 535 | { |
| 536 | case ATOM: return(varble->clb = lbot[1].val); |
| 537 | |
| 538 | case VALUE: return(varble->l = lbot[1].val); |
| 539 | } |
| 540 | |
| 541 | error("IMPROPER USE OF SET",FALSE); |
| 542 | } |
| 543 | lispval |
| 544 | Lequal() |
| 545 | { |
| 546 | chkarg(2); |
| 547 | |
| 548 | if( lbot[1].val == lbot->val ) return(tatom); |
| 549 | if(Iequal(lbot[1].val,lbot->val)) return(tatom); else return(nil); |
| 550 | } |
| 551 | |
| 552 | Iequal(first,second) |
| 553 | register lispval first, second; |
| 554 | { |
| 555 | register type1, type2; |
| 556 | register struct argent *lbot, *np; |
| 557 | lispval Lsub(),Lzerop(); |
| 558 | |
| 559 | if(first==second) |
| 560 | return(1); |
| 561 | type1=TYPE(first); |
| 562 | type2=TYPE(second); |
| 563 | if(type1!=type2) { |
| 564 | if((type1==SDOT&&type2==INT)||(type1==INT&&type2==SDOT)) |
| 565 | goto dosub; |
| 566 | return(0); |
| 567 | } |
| 568 | switch(type1) { |
| 569 | case DTPR: |
| 570 | return( |
| 571 | Iequal(first->car,second->car) && |
| 572 | Iequal(first->cdr,second->cdr) ); |
| 573 | case DOUB: |
| 574 | return(first->r==second->r); |
| 575 | case INT: |
| 576 | return( (first->i==second->i)); |
| 577 | dosub: |
| 578 | case SDOT: |
| 579 | lbot = np; |
| 580 | np++->val = first; |
| 581 | np++->val = second; |
| 582 | lbot->val = Lsub(); |
| 583 | np = lbot + 1; |
| 584 | return(Lzerop()!=nil); |
| 585 | case VALUE: |
| 586 | return( first->l==second->l ); |
| 587 | case STRNG: |
| 588 | return(strcmp(first,second)==0); |
| 589 | } |
| 590 | return(0); |
| 591 | } |
| 592 | |
| 593 | lispval |
| 594 | Lprint() |
| 595 | { |
| 596 | chkarg(2); |
| 597 | chkrtab(Vreadtable->clb); |
| 598 | printr(lbot->val,okport(lbot[1].val,okport(Vpoport->clb,poport))); |
| 599 | return(nil); |
| 600 | } |
| 601 | |
| 602 | FILE * |
| 603 | okport(arg,proper) |
| 604 | lispval arg; |
| 605 | FILE *proper; |
| 606 | { |
| 607 | if(TYPE(arg)!=PORT) |
| 608 | return(proper); |
| 609 | else |
| 610 | return(arg->p); |
| 611 | } |
| 612 | lispval |
| 613 | Lpatom() |
| 614 | { |
| 615 | register lispval temp; |
| 616 | FILE *port; |
| 617 | |
| 618 | chkarg(2); |
| 619 | temp = Vreadtable->clb; |
| 620 | chkrtab(temp); |
| 621 | port = okport(lbot[1].val, okport(Vpoport->clb,stdout)); |
| 622 | if ((TYPE((temp = (lbot)->val)))!=ATOM) |
| 623 | printr(temp, port); |
| 624 | else |
| 625 | fputs(temp->pname, port); |
| 626 | return(temp); |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * (pntlen thing) returns the length it takes to print out |
| 631 | * an atom or number. |
| 632 | */ |
| 633 | |
| 634 | lispval |
| 635 | Lpntlen() |
| 636 | { |
| 637 | register lispval temp; |
| 638 | return(inewint(Ipntlen())); |
| 639 | } |
| 640 | Ipntlen() |
| 641 | { |
| 642 | register lispval temp; |
| 643 | register char *handy; |
| 644 | |
| 645 | temp = np[-1].val; |
| 646 | loop: switch(TYPE(temp)) { |
| 647 | |
| 648 | case ATOM: |
| 649 | handy = temp->pname; |
| 650 | break; |
| 651 | |
| 652 | case INT: |
| 653 | sprintf(strbuf,"%d",temp->i); |
| 654 | handy =strbuf; |
| 655 | break; |
| 656 | |
| 657 | case DOUB: |
| 658 | sprintf(strbuf,"%g",temp->r); |
| 659 | handy =strbuf; |
| 660 | break; |
| 661 | |
| 662 | default: |
| 663 | temp = error("Non atom or number to pntlen\n",TRUE); |
| 664 | goto loop; |
| 665 | } |
| 666 | |
| 667 | return( strlen(handy)); |
| 668 | } |