| 1 | static char *sccsid = "@(#)exp.c 4.1 %G%"; |
| 2 | |
| 3 | #include "sh.h" |
| 4 | |
| 5 | /* |
| 6 | * C shell |
| 7 | */ |
| 8 | |
| 9 | #define IGNORE 1 /* in ignore, it means to ignore value, just parse */ |
| 10 | #define NOGLOB 2 /* in ignore, it means not to globone */ |
| 11 | |
| 12 | #define ADDOP 1 |
| 13 | #define MULOP 2 |
| 14 | #define EQOP 4 |
| 15 | #define RELOP 8 |
| 16 | #define RESTOP 16 |
| 17 | #define ANYOP 31 |
| 18 | |
| 19 | #define EQEQ 1 |
| 20 | #define GTR 2 |
| 21 | #define LSS 4 |
| 22 | #define NOTEQ 6 |
| 23 | #define EQMATCH 7 |
| 24 | #define NOTEQMATCH 8 |
| 25 | |
| 26 | exp(vp) |
| 27 | register char ***vp; |
| 28 | { |
| 29 | |
| 30 | return (exp0(vp, 0)); |
| 31 | } |
| 32 | |
| 33 | exp0(vp, ignore) |
| 34 | register char ***vp; |
| 35 | bool ignore; |
| 36 | { |
| 37 | register int p1 = exp1(vp, ignore); |
| 38 | |
| 39 | #ifdef EDEBUG |
| 40 | etraci("exp0 p1", p1, vp); |
| 41 | #endif |
| 42 | if (**vp && eq(**vp, "||")) { |
| 43 | register int p2; |
| 44 | |
| 45 | (*vp)++; |
| 46 | p2 = exp0(vp, (ignore&IGNORE) || p1); |
| 47 | #ifdef EDEBUG |
| 48 | etraci("exp0 p2", p2, vp); |
| 49 | #endif |
| 50 | return (p1 || p2); |
| 51 | } |
| 52 | return (p1); |
| 53 | } |
| 54 | |
| 55 | exp1(vp, ignore) |
| 56 | register char ***vp; |
| 57 | { |
| 58 | register int p1 = exp2(vp, ignore); |
| 59 | |
| 60 | #ifdef EDEBUG |
| 61 | etraci("exp1 p1", p1, vp); |
| 62 | #endif |
| 63 | if (**vp && eq(**vp, "&&")) { |
| 64 | register int p2; |
| 65 | |
| 66 | (*vp)++; |
| 67 | p2 = exp1(vp, (ignore&IGNORE) || !p1); |
| 68 | #ifdef EDEBUG |
| 69 | etraci("exp1 p2", p2, vp); |
| 70 | #endif |
| 71 | return (p1 && p2); |
| 72 | } |
| 73 | return (p1); |
| 74 | } |
| 75 | |
| 76 | exp2(vp, ignore) |
| 77 | register char ***vp; |
| 78 | bool ignore; |
| 79 | { |
| 80 | register int p1 = exp2a(vp, ignore); |
| 81 | |
| 82 | #ifdef EDEBUG |
| 83 | etraci("exp3 p1", p1, vp); |
| 84 | #endif |
| 85 | if (**vp && eq(**vp, "|")) { |
| 86 | register int p2; |
| 87 | |
| 88 | (*vp)++; |
| 89 | p2 = exp2(vp, ignore); |
| 90 | #ifdef EDEBUG |
| 91 | etraci("exp3 p2", p2, vp); |
| 92 | #endif |
| 93 | return (p1 | p2); |
| 94 | } |
| 95 | return (p1); |
| 96 | } |
| 97 | |
| 98 | exp2a(vp, ignore) |
| 99 | register char ***vp; |
| 100 | bool ignore; |
| 101 | { |
| 102 | register int p1 = exp2b(vp, ignore); |
| 103 | |
| 104 | #ifdef EDEBUG |
| 105 | etraci("exp2a p1", p1, vp); |
| 106 | #endif |
| 107 | if (**vp && eq(**vp, "^")) { |
| 108 | register int p2; |
| 109 | |
| 110 | (*vp)++; |
| 111 | p2 = exp2a(vp, ignore); |
| 112 | #ifdef EDEBUG |
| 113 | etraci("exp2a p2", p2, vp); |
| 114 | #endif |
| 115 | return (p1 ^ p2); |
| 116 | } |
| 117 | return (p1); |
| 118 | } |
| 119 | |
| 120 | exp2b(vp, ignore) |
| 121 | register char ***vp; |
| 122 | bool ignore; |
| 123 | { |
| 124 | register int p1 = exp2c(vp, ignore); |
| 125 | |
| 126 | #ifdef EDEBUG |
| 127 | etraci("exp2b p1", p1, vp); |
| 128 | #endif |
| 129 | if (**vp && eq(**vp, "&")) { |
| 130 | register int p2; |
| 131 | |
| 132 | (*vp)++; |
| 133 | p2 = exp2b(vp, ignore); |
| 134 | #ifdef EDEBUG |
| 135 | etraci("exp2b p2", p2, vp); |
| 136 | #endif |
| 137 | return (p1 & p2); |
| 138 | } |
| 139 | return (p1); |
| 140 | } |
| 141 | |
| 142 | exp2c(vp, ignore) |
| 143 | register char ***vp; |
| 144 | bool ignore; |
| 145 | { |
| 146 | register char *p1 = exp3(vp, ignore); |
| 147 | register char *p2; |
| 148 | register int i; |
| 149 | |
| 150 | #ifdef EDEBUG |
| 151 | etracc("exp2c p1", p1, vp); |
| 152 | #endif |
| 153 | if (i = isa(**vp, EQOP)) { |
| 154 | (*vp)++; |
| 155 | if (i == EQMATCH || i == NOTEQMATCH) |
| 156 | ignore |= NOGLOB; |
| 157 | p2 = exp3(vp, ignore); |
| 158 | #ifdef EDEBUG |
| 159 | etracc("exp2c p2", p2, vp); |
| 160 | #endif |
| 161 | if (!(ignore&IGNORE)) switch (i) { |
| 162 | |
| 163 | case EQEQ: |
| 164 | i = eq(p1, p2); |
| 165 | break; |
| 166 | |
| 167 | case NOTEQ: |
| 168 | i = !eq(p1, p2); |
| 169 | break; |
| 170 | |
| 171 | case EQMATCH: |
| 172 | i = Gmatch(p1, p2); |
| 173 | break; |
| 174 | |
| 175 | case NOTEQMATCH: |
| 176 | i = !Gmatch(p1, p2); |
| 177 | break; |
| 178 | } |
| 179 | xfree(p1), xfree(p2); |
| 180 | return (i); |
| 181 | } |
| 182 | i = egetn(p1); |
| 183 | xfree(p1); |
| 184 | return (i); |
| 185 | } |
| 186 | |
| 187 | char * |
| 188 | exp3(vp, ignore) |
| 189 | register char ***vp; |
| 190 | bool ignore; |
| 191 | { |
| 192 | register char *p1, *p2; |
| 193 | register int i; |
| 194 | |
| 195 | p1 = exp3a(vp, ignore); |
| 196 | #ifdef EDEBUG |
| 197 | etracc("exp3 p1", p1, vp); |
| 198 | #endif |
| 199 | if (i = isa(**vp, RELOP)) { |
| 200 | (*vp)++; |
| 201 | if (**vp && eq(**vp, "=")) |
| 202 | i |= 1, (*vp)++; |
| 203 | p2 = exp3(vp, ignore); |
| 204 | #ifdef EDEBUG |
| 205 | etracc("exp3 p2", p2, vp); |
| 206 | #endif |
| 207 | if (!(ignore&IGNORE)) switch (i) { |
| 208 | |
| 209 | case GTR: |
| 210 | i = egetn(p1) > egetn(p2); |
| 211 | break; |
| 212 | |
| 213 | case GTR|1: |
| 214 | i = egetn(p1) >= egetn(p2); |
| 215 | break; |
| 216 | |
| 217 | case LSS: |
| 218 | i = egetn(p1) < egetn(p2); |
| 219 | break; |
| 220 | |
| 221 | case LSS|1: |
| 222 | i = egetn(p1) <= egetn(p2); |
| 223 | break; |
| 224 | } |
| 225 | xfree(p1), xfree(p2); |
| 226 | return (putn(i)); |
| 227 | } |
| 228 | return (p1); |
| 229 | } |
| 230 | |
| 231 | char * |
| 232 | exp3a(vp, ignore) |
| 233 | register char ***vp; |
| 234 | bool ignore; |
| 235 | { |
| 236 | register char *p1, *p2, *op; |
| 237 | register int i; |
| 238 | |
| 239 | p1 = exp4(vp, ignore); |
| 240 | #ifdef EDEBUG |
| 241 | etracc("exp3a p1", p1, vp); |
| 242 | #endif |
| 243 | op = **vp; |
| 244 | if (op && any(op[0], "<>") && op[0] == op[1]) { |
| 245 | (*vp)++; |
| 246 | p2 = exp3a(vp, ignore); |
| 247 | #ifdef EDEBUG |
| 248 | etracc("exp3a p2", p2, vp); |
| 249 | #endif |
| 250 | if (op[0] == '<') |
| 251 | i = egetn(p1) << egetn(p2); |
| 252 | else |
| 253 | i = egetn(p1) >> egetn(p2); |
| 254 | xfree(p1), xfree(p2); |
| 255 | return (putn(i)); |
| 256 | } |
| 257 | return (p1); |
| 258 | } |
| 259 | |
| 260 | char * |
| 261 | exp4(vp, ignore) |
| 262 | register char ***vp; |
| 263 | bool ignore; |
| 264 | { |
| 265 | register char *p1, *p2; |
| 266 | register int i = 0; |
| 267 | |
| 268 | p1 = exp5(vp, ignore); |
| 269 | #ifdef EDEBUG |
| 270 | etracc("exp4 p1", p1, vp); |
| 271 | #endif |
| 272 | if (isa(**vp, ADDOP)) { |
| 273 | register char *op = *(*vp)++; |
| 274 | |
| 275 | p2 = exp4(vp, ignore); |
| 276 | #ifdef EDEBUG |
| 277 | etracc("exp4 p2", p2, vp); |
| 278 | #endif |
| 279 | if (!(ignore&IGNORE)) switch (op[0]) { |
| 280 | |
| 281 | case '+': |
| 282 | i = egetn(p1) + egetn(p2); |
| 283 | break; |
| 284 | |
| 285 | case '-': |
| 286 | i = egetn(p1) - egetn(p2); |
| 287 | break; |
| 288 | } |
| 289 | xfree(p1), xfree(p2); |
| 290 | return (putn(i)); |
| 291 | } |
| 292 | return (p1); |
| 293 | } |
| 294 | |
| 295 | char * |
| 296 | exp5(vp, ignore) |
| 297 | register char ***vp; |
| 298 | bool ignore; |
| 299 | { |
| 300 | register char *p1, *p2; |
| 301 | register int i = 0; |
| 302 | |
| 303 | p1 = exp6(vp, ignore); |
| 304 | #ifdef EDEBUG |
| 305 | etracc("exp5 p1", p1, vp); |
| 306 | #endif |
| 307 | if (isa(**vp, MULOP)) { |
| 308 | register char *op = *(*vp)++; |
| 309 | |
| 310 | p2 = exp5(vp, ignore); |
| 311 | #ifdef EDEBUG |
| 312 | etracc("exp5 p2", p2, vp); |
| 313 | #endif |
| 314 | if (!(ignore&IGNORE)) switch (op[0]) { |
| 315 | |
| 316 | case '*': |
| 317 | i = egetn(p1) * egetn(p2); |
| 318 | break; |
| 319 | |
| 320 | case '/': |
| 321 | i = egetn(p2); |
| 322 | if (i == 0) |
| 323 | error("Divide by 0"); |
| 324 | i = egetn(p1) / i; |
| 325 | break; |
| 326 | |
| 327 | case '%': |
| 328 | i = egetn(p2); |
| 329 | if (i == 0) |
| 330 | error("Mod by 0"); |
| 331 | i = egetn(p1) % i; |
| 332 | break; |
| 333 | } |
| 334 | xfree(p1), xfree(p2); |
| 335 | return (putn(i)); |
| 336 | } |
| 337 | return (p1); |
| 338 | } |
| 339 | |
| 340 | char * |
| 341 | exp6(vp, ignore) |
| 342 | register char ***vp; |
| 343 | { |
| 344 | int ccode, i; |
| 345 | register char *cp, *dp, *ep; |
| 346 | |
| 347 | if (eq(**vp, "!")) { |
| 348 | (*vp)++; |
| 349 | cp = exp6(vp, ignore); |
| 350 | #ifdef EDEBUG |
| 351 | etracc("exp6 ! cp", cp, vp); |
| 352 | #endif |
| 353 | i = egetn(cp); |
| 354 | xfree(cp); |
| 355 | return (putn(!i)); |
| 356 | } |
| 357 | if (eq(**vp, "~")) { |
| 358 | (*vp)++; |
| 359 | cp = exp6(vp, ignore); |
| 360 | #ifdef EDEBUG |
| 361 | etracc("exp6 ~ cp", cp, vp); |
| 362 | #endif |
| 363 | i = egetn(cp); |
| 364 | xfree(cp); |
| 365 | return (putn(~i)); |
| 366 | } |
| 367 | if (eq(**vp, "(")) { |
| 368 | (*vp)++; |
| 369 | ccode = exp0(vp, ignore); |
| 370 | #ifdef EDEBUG |
| 371 | etraci("exp6 () ccode", ccode, vp); |
| 372 | #endif |
| 373 | if (*vp == 0 || **vp == 0 || ***vp != ')') |
| 374 | bferr("Expression syntax"); |
| 375 | (*vp)++; |
| 376 | return (putn(ccode)); |
| 377 | } |
| 378 | if (eq(**vp, "{")) { |
| 379 | register char **v; |
| 380 | struct command faket; |
| 381 | char *fakecom[2]; |
| 382 | |
| 383 | faket.t_dtyp = TCOM; |
| 384 | faket.t_dflg = 0; |
| 385 | faket.t_dcar = faket.t_dcdr = faket.t_dspr = (struct command *)0; |
| 386 | faket.t_dcom = fakecom; |
| 387 | fakecom[0] = "{ ... }"; |
| 388 | fakecom[1] = NOSTR; |
| 389 | (*vp)++; |
| 390 | v = *vp; |
| 391 | for (;;) { |
| 392 | if (!**vp) |
| 393 | bferr("Missing }"); |
| 394 | if (eq(*(*vp)++, "}")) |
| 395 | break; |
| 396 | } |
| 397 | if (ignore&IGNORE) |
| 398 | return (""); |
| 399 | psavejob(); |
| 400 | if (pfork(&faket, -1) == 0) { |
| 401 | *--(*vp) = 0; |
| 402 | evalav(v); |
| 403 | exitstat(); |
| 404 | } |
| 405 | pwait(); |
| 406 | prestjob(); |
| 407 | #ifdef EDEBUG |
| 408 | etraci("exp6 {} status", egetn(value("status")), vp); |
| 409 | #endif |
| 410 | return (putn(egetn(value("status")) == 0)); |
| 411 | } |
| 412 | if (isa(**vp, ANYOP)) |
| 413 | return (""); |
| 414 | cp = *(*vp)++; |
| 415 | if (*cp == '-' && any(cp[1], "erwxfdzo")) { |
| 416 | struct stat stb; |
| 417 | |
| 418 | if (isa(**vp, ANYOP)) |
| 419 | bferr("Missing file name"); |
| 420 | dp = *(*vp)++; |
| 421 | if (ignore&IGNORE) |
| 422 | return (""); |
| 423 | ep = globone(dp); |
| 424 | switch (cp[1]) { |
| 425 | |
| 426 | case 'r': |
| 427 | i = !access(ep, 4); |
| 428 | break; |
| 429 | |
| 430 | case 'w': |
| 431 | i = !access(ep, 2); |
| 432 | break; |
| 433 | |
| 434 | case 'x': |
| 435 | i = !access(ep, 1); |
| 436 | break; |
| 437 | |
| 438 | default: |
| 439 | if (stat(ep, &stb)) { |
| 440 | xfree(ep); |
| 441 | return ("0"); |
| 442 | } |
| 443 | switch (cp[1]) { |
| 444 | |
| 445 | case 'f': |
| 446 | i = (stb.st_mode & S_IFMT) == S_IFREG; |
| 447 | break; |
| 448 | |
| 449 | case 'd': |
| 450 | i = (stb.st_mode & S_IFMT) == S_IFDIR; |
| 451 | break; |
| 452 | |
| 453 | case 'z': |
| 454 | i = stb.st_size == 0; |
| 455 | break; |
| 456 | |
| 457 | case 'e': |
| 458 | i = 1; |
| 459 | break; |
| 460 | |
| 461 | case 'o': |
| 462 | i = stb.st_uid == uid; |
| 463 | break; |
| 464 | } |
| 465 | } |
| 466 | #ifdef EDEBUG |
| 467 | etraci("exp6 -? i", i, vp); |
| 468 | #endif |
| 469 | xfree(ep); |
| 470 | return (putn(i)); |
| 471 | } |
| 472 | #ifdef EDEBUG |
| 473 | etracc("exp6 default", cp, vp); |
| 474 | #endif |
| 475 | return (ignore&NOGLOB ? cp : globone(cp)); |
| 476 | } |
| 477 | |
| 478 | evalav(v) |
| 479 | register char **v; |
| 480 | { |
| 481 | struct wordent paraml; |
| 482 | register struct wordent *hp = ¶ml; |
| 483 | struct command *t; |
| 484 | register struct wordent *wdp = hp; |
| 485 | |
| 486 | set("status", "0"); |
| 487 | hp->prev = hp->next = hp; |
| 488 | hp->word = ""; |
| 489 | while (*v) { |
| 490 | register struct wordent *new = (struct wordent *) calloc(1, sizeof *wdp); |
| 491 | |
| 492 | new->prev = wdp; |
| 493 | new->next = hp; |
| 494 | wdp->next = new; |
| 495 | wdp = new; |
| 496 | wdp->word = savestr(*v++); |
| 497 | } |
| 498 | hp->prev = wdp; |
| 499 | alias(¶ml); |
| 500 | t = syntax(paraml.next, ¶ml, 0); |
| 501 | if (err) |
| 502 | error(err); |
| 503 | execute(t, -1); |
| 504 | freelex(¶ml), freesyn(t); |
| 505 | } |
| 506 | |
| 507 | isa(cp, what) |
| 508 | register char *cp; |
| 509 | register int what; |
| 510 | { |
| 511 | |
| 512 | if (cp == 0) |
| 513 | return ((what & RESTOP) != 0); |
| 514 | if (cp[1] == 0) { |
| 515 | if ((what & ADDOP) && any(cp[0], "+-")) |
| 516 | return (1); |
| 517 | if ((what & MULOP) && any(cp[0], "*/%")) |
| 518 | return (1); |
| 519 | if ((what & RESTOP) && any(cp[0], "()!~^")) |
| 520 | return (1); |
| 521 | } |
| 522 | if ((what & RESTOP) && (any(cp[0], "|&") || eq(cp, "<<") || eq(cp, ">>"))) |
| 523 | return (1); |
| 524 | if (what & EQOP) { |
| 525 | if (eq(cp, "==")) |
| 526 | return (EQEQ); |
| 527 | if (eq(cp, "!=")) |
| 528 | return (NOTEQ); |
| 529 | if (eq(cp, "=~")) |
| 530 | return (EQMATCH); |
| 531 | if (eq(cp, "!~")) |
| 532 | return (NOTEQMATCH); |
| 533 | } |
| 534 | if (!(what & RELOP)) |
| 535 | return (0); |
| 536 | if (*cp == '<') |
| 537 | return (LSS); |
| 538 | if (*cp == '>') |
| 539 | return (GTR); |
| 540 | return (0); |
| 541 | } |
| 542 | |
| 543 | egetn(cp) |
| 544 | register char *cp; |
| 545 | { |
| 546 | |
| 547 | if (*cp && *cp != '-' && !digit(*cp)) |
| 548 | bferr("Expression syntax"); |
| 549 | return (getn(cp)); |
| 550 | } |
| 551 | |
| 552 | /* Phew! */ |
| 553 | |
| 554 | #ifdef EDEBUG |
| 555 | etraci(str, i, vp) |
| 556 | char *str; |
| 557 | int i; |
| 558 | char ***vp; |
| 559 | { |
| 560 | |
| 561 | printf("%s=%d\t", str, i); |
| 562 | blkpr(*vp); |
| 563 | printf("\n"); |
| 564 | } |
| 565 | |
| 566 | etracc(str, cp, vp) |
| 567 | char *str, *cp; |
| 568 | char ***vp; |
| 569 | { |
| 570 | |
| 571 | printf("%s=%s\t", str, cp); |
| 572 | blkpr(*vp); |
| 573 | printf("\n"); |
| 574 | } |
| 575 | #endif |