| 1 | /*- |
| 2 | * Copyright (c) 1991, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Kenneth Almquist. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * @(#)var.c 8.3 (Berkeley) 5/4/95 |
| 37 | * $FreeBSD: src/bin/sh/var.c,v 1.15.2.2 2002/08/27 01:36:28 tjr Exp $ |
| 38 | * $DragonFly: src/bin/sh/var.c,v 1.6 2004/10/01 20:38:40 dillon Exp $ |
| 39 | */ |
| 40 | |
| 41 | #include <unistd.h> |
| 42 | #include <stdlib.h> |
| 43 | |
| 44 | /* |
| 45 | * Shell variables. |
| 46 | */ |
| 47 | |
| 48 | #include <locale.h> |
| 49 | |
| 50 | #include "shell.h" |
| 51 | #include "output.h" |
| 52 | #include "expand.h" |
| 53 | #include "nodes.h" /* for other headers */ |
| 54 | #include "eval.h" /* defines cmdenviron */ |
| 55 | #include "exec.h" |
| 56 | #include "syntax.h" |
| 57 | #include "options.h" |
| 58 | #include "mail.h" |
| 59 | #include "var.h" |
| 60 | #include "memalloc.h" |
| 61 | #include "error.h" |
| 62 | #include "mystring.h" |
| 63 | #include "parser.h" |
| 64 | #ifndef NO_HISTORY |
| 65 | #include "myhistedit.h" |
| 66 | #endif |
| 67 | |
| 68 | |
| 69 | #define VTABSIZE 39 |
| 70 | |
| 71 | |
| 72 | struct varinit { |
| 73 | struct var *var; |
| 74 | int flags; |
| 75 | const char *text; |
| 76 | void (*func)(const char *); |
| 77 | }; |
| 78 | |
| 79 | |
| 80 | #ifndef NO_HISTORY |
| 81 | struct var vhistsize; |
| 82 | #endif |
| 83 | struct var vifs; |
| 84 | struct var vmail; |
| 85 | struct var vmpath; |
| 86 | struct var vpath; |
| 87 | struct var vppid; |
| 88 | struct var vps1; |
| 89 | struct var vps2; |
| 90 | struct var vvers; |
| 91 | STATIC struct var voptind; |
| 92 | |
| 93 | STATIC const struct varinit varinit[] = { |
| 94 | #ifndef NO_HISTORY |
| 95 | { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=", |
| 96 | sethistsize }, |
| 97 | #endif |
| 98 | { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n", |
| 99 | NULL }, |
| 100 | { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=", |
| 101 | NULL }, |
| 102 | { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=", |
| 103 | NULL }, |
| 104 | { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=/bin:/usr/bin", |
| 105 | changepath }, |
| 106 | { &vppid, VSTRFIXED|VTEXTFIXED|VUNSET, "PPID=", |
| 107 | NULL }, |
| 108 | /* |
| 109 | * vps1 depends on uid |
| 110 | */ |
| 111 | { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ", |
| 112 | NULL }, |
| 113 | { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1", |
| 114 | getoptsreset }, |
| 115 | { NULL, 0, NULL, |
| 116 | NULL } |
| 117 | }; |
| 118 | |
| 119 | STATIC struct var *vartab[VTABSIZE]; |
| 120 | |
| 121 | STATIC struct var **hashvar(const char *); |
| 122 | STATIC int varequal(const char *, const char *); |
| 123 | STATIC int localevar(const char *); |
| 124 | |
| 125 | /* |
| 126 | * Initialize the variable symbol tables and import the environment. |
| 127 | */ |
| 128 | |
| 129 | #ifdef mkinit |
| 130 | INCLUDE "var.h" |
| 131 | INIT { |
| 132 | char **envp; |
| 133 | extern char **environ; |
| 134 | |
| 135 | initvar(); |
| 136 | for (envp = environ ; *envp ; envp++) { |
| 137 | if (strchr(*envp, '=')) { |
| 138 | setvareq(*envp, VEXPORT|VTEXTFIXED); |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | #endif |
| 143 | |
| 144 | |
| 145 | /* |
| 146 | * This routine initializes the builtin variables. It is called when the |
| 147 | * shell is initialized and again when a shell procedure is spawned. |
| 148 | */ |
| 149 | |
| 150 | void |
| 151 | initvar(void) |
| 152 | { |
| 153 | char ppid[20]; |
| 154 | const struct varinit *ip; |
| 155 | struct var *vp; |
| 156 | struct var **vpp; |
| 157 | |
| 158 | for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { |
| 159 | if ((vp->flags & VEXPORT) == 0) { |
| 160 | vpp = hashvar(ip->text); |
| 161 | vp->next = *vpp; |
| 162 | *vpp = vp; |
| 163 | vp->text = ip->text; |
| 164 | vp->flags = ip->flags; |
| 165 | vp->func = ip->func; |
| 166 | } |
| 167 | } |
| 168 | /* |
| 169 | * PS1 depends on uid |
| 170 | */ |
| 171 | if ((vps1.flags & VEXPORT) == 0) { |
| 172 | vpp = hashvar("PS1="); |
| 173 | vps1.next = *vpp; |
| 174 | *vpp = &vps1; |
| 175 | vps1.text = geteuid() ? "PS1=$ " : "PS1=# "; |
| 176 | vps1.flags = VSTRFIXED|VTEXTFIXED; |
| 177 | } |
| 178 | if ((vppid.flags & VEXPORT) == 0) { |
| 179 | fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); |
| 180 | setvarsafe("PPID", ppid, 0); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * Safe version of setvar, returns 1 on success 0 on failure. |
| 186 | */ |
| 187 | |
| 188 | int |
| 189 | setvarsafe(const char *name, const char *val, int flags) |
| 190 | { |
| 191 | struct jmploc jmploc; |
| 192 | struct jmploc *volatile savehandler = handler; |
| 193 | int err = 0; |
| 194 | #if __GNUC__ |
| 195 | /* Avoid longjmp clobbering */ |
| 196 | (void) &err; |
| 197 | #endif |
| 198 | |
| 199 | if (setjmp(jmploc.loc)) |
| 200 | err = 1; |
| 201 | else { |
| 202 | handler = &jmploc; |
| 203 | setvar(name, val, flags); |
| 204 | } |
| 205 | handler = savehandler; |
| 206 | return err; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Set the value of a variable. The flags argument is tored with the |
| 211 | * flags of the variable. If val is NULL, the variable is unset. |
| 212 | */ |
| 213 | |
| 214 | void |
| 215 | setvar(const char *name, const char *val, int flags) |
| 216 | { |
| 217 | const char *cp; |
| 218 | char *p; |
| 219 | int len; |
| 220 | int namelen; |
| 221 | char *nameeq; |
| 222 | int isbad; |
| 223 | |
| 224 | isbad = 0; |
| 225 | cp = name; |
| 226 | if (!is_name(*cp)) |
| 227 | isbad = 1; |
| 228 | cp++; |
| 229 | for (;;) { |
| 230 | if (!is_in_name(*cp)) { |
| 231 | if (*cp == '\0' || *cp == '=') |
| 232 | break; |
| 233 | isbad = 1; |
| 234 | } |
| 235 | cp++; |
| 236 | } |
| 237 | namelen = cp - name; |
| 238 | if (isbad) |
| 239 | error("%.*s: bad variable name", namelen, name); |
| 240 | len = namelen + 2; /* 2 is space for '=' and '\0' */ |
| 241 | if (val == NULL) { |
| 242 | flags |= VUNSET; |
| 243 | } else { |
| 244 | len += strlen(val); |
| 245 | } |
| 246 | p = nameeq = ckmalloc(len); |
| 247 | cp = name; |
| 248 | while (--namelen >= 0) |
| 249 | *p++ = *cp++; |
| 250 | *p++ = '='; |
| 251 | *p = '\0'; |
| 252 | if (val) |
| 253 | scopy(val, p); |
| 254 | setvareq(nameeq, flags); |
| 255 | } |
| 256 | |
| 257 | STATIC int |
| 258 | localevar(const char *s) |
| 259 | { |
| 260 | static const char * const lnames[7] = { |
| 261 | "ALL", "COLLATE", "CTYPE", "MONETARY", |
| 262 | "NUMERIC", "TIME", NULL |
| 263 | }; |
| 264 | const char * const *ss; |
| 265 | |
| 266 | if (*s != 'L') |
| 267 | return 0; |
| 268 | if (varequal(s + 1, "ANG")) |
| 269 | return 1; |
| 270 | if (strncmp(s + 1, "C_", 2) != 0) |
| 271 | return 0; |
| 272 | for (ss = lnames; *ss ; ss++) |
| 273 | if (varequal(s + 3, *ss)) |
| 274 | return 1; |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Same as setvar except that the variable and value are passed in |
| 280 | * the first argument as name=value. Since the first argument will |
| 281 | * be actually stored in the table, it should not be a string that |
| 282 | * will go away. |
| 283 | */ |
| 284 | |
| 285 | void |
| 286 | setvareq(char *s, int flags) |
| 287 | { |
| 288 | struct var *vp, **vpp; |
| 289 | int len; |
| 290 | |
| 291 | if (aflag) |
| 292 | flags |= VEXPORT; |
| 293 | vpp = hashvar(s); |
| 294 | for (vp = *vpp ; vp ; vp = vp->next) { |
| 295 | if (varequal(s, vp->text)) { |
| 296 | if (vp->flags & VREADONLY) { |
| 297 | len = strchr(s, '=') - s; |
| 298 | error("%.*s: is read only", len, s); |
| 299 | } |
| 300 | INTOFF; |
| 301 | |
| 302 | if (vp->func && (flags & VNOFUNC) == 0) |
| 303 | (*vp->func)(strchr(s, '=') + 1); |
| 304 | |
| 305 | if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) |
| 306 | ckfree(vp->text); |
| 307 | |
| 308 | vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); |
| 309 | vp->flags |= flags; |
| 310 | vp->text = s; |
| 311 | |
| 312 | /* |
| 313 | * We could roll this to a function, to handle it as |
| 314 | * a regular variable function callback, but why bother? |
| 315 | */ |
| 316 | if (vp == &vmpath || (vp == &vmail && ! mpathset())) |
| 317 | chkmail(1); |
| 318 | if ((vp->flags & VEXPORT) && localevar(s)) { |
| 319 | putenv(s); |
| 320 | (void) setlocale(LC_ALL, ""); |
| 321 | } |
| 322 | INTON; |
| 323 | return; |
| 324 | } |
| 325 | } |
| 326 | /* not found */ |
| 327 | vp = ckmalloc(sizeof (*vp)); |
| 328 | vp->flags = flags; |
| 329 | vp->text = s; |
| 330 | vp->next = *vpp; |
| 331 | vp->func = NULL; |
| 332 | INTOFF; |
| 333 | *vpp = vp; |
| 334 | if ((vp->flags & VEXPORT) && localevar(s)) { |
| 335 | putenv(s); |
| 336 | (void) setlocale(LC_ALL, ""); |
| 337 | } |
| 338 | INTON; |
| 339 | } |
| 340 | |
| 341 | |
| 342 | |
| 343 | /* |
| 344 | * Process a linked list of variable assignments. |
| 345 | */ |
| 346 | |
| 347 | void |
| 348 | listsetvar(struct strlist *list) |
| 349 | { |
| 350 | struct strlist *lp; |
| 351 | |
| 352 | INTOFF; |
| 353 | for (lp = list ; lp ; lp = lp->next) { |
| 354 | setvareq(savestr(lp->text), 0); |
| 355 | } |
| 356 | INTON; |
| 357 | } |
| 358 | |
| 359 | |
| 360 | |
| 361 | /* |
| 362 | * Find the value of a variable. Returns NULL if not set. |
| 363 | */ |
| 364 | |
| 365 | char * |
| 366 | lookupvar(const char *name) |
| 367 | { |
| 368 | struct var *v; |
| 369 | |
| 370 | for (v = *hashvar(name) ; v ; v = v->next) { |
| 371 | if (varequal(v->text, name)) { |
| 372 | if (v->flags & VUNSET) |
| 373 | return NULL; |
| 374 | return strchr(v->text, '=') + 1; |
| 375 | } |
| 376 | } |
| 377 | return NULL; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | |
| 382 | /* |
| 383 | * Search the environment of a builtin command. If the second argument |
| 384 | * is nonzero, return the value of a variable even if it hasn't been |
| 385 | * exported. |
| 386 | */ |
| 387 | |
| 388 | char * |
| 389 | bltinlookup(const char *name, int doall) |
| 390 | { |
| 391 | struct strlist *sp; |
| 392 | struct var *v; |
| 393 | |
| 394 | for (sp = cmdenviron ; sp ; sp = sp->next) { |
| 395 | if (varequal(sp->text, name)) |
| 396 | return strchr(sp->text, '=') + 1; |
| 397 | } |
| 398 | for (v = *hashvar(name) ; v ; v = v->next) { |
| 399 | if (varequal(v->text, name)) { |
| 400 | if ((v->flags & VUNSET) |
| 401 | || (!doall && (v->flags & VEXPORT) == 0)) |
| 402 | return NULL; |
| 403 | return strchr(v->text, '=') + 1; |
| 404 | } |
| 405 | } |
| 406 | return NULL; |
| 407 | } |
| 408 | |
| 409 | |
| 410 | |
| 411 | /* |
| 412 | * Generate a list of exported variables. This routine is used to construct |
| 413 | * the third argument to execve when executing a program. |
| 414 | */ |
| 415 | |
| 416 | char ** |
| 417 | environment(void) |
| 418 | { |
| 419 | int nenv; |
| 420 | struct var **vpp; |
| 421 | struct var *vp; |
| 422 | char **env, **ep; |
| 423 | |
| 424 | nenv = 0; |
| 425 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { |
| 426 | for (vp = *vpp ; vp ; vp = vp->next) |
| 427 | if (vp->flags & VEXPORT) |
| 428 | nenv++; |
| 429 | } |
| 430 | ep = env = stalloc((nenv + 1) * sizeof *env); |
| 431 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { |
| 432 | for (vp = *vpp ; vp ; vp = vp->next) |
| 433 | if (vp->flags & VEXPORT) |
| 434 | *ep++ = vp->text; |
| 435 | } |
| 436 | *ep = NULL; |
| 437 | return env; |
| 438 | } |
| 439 | |
| 440 | |
| 441 | /* |
| 442 | * Called when a shell procedure is invoked to clear out nonexported |
| 443 | * variables. It is also necessary to reallocate variables of with |
| 444 | * VSTACK set since these are currently allocated on the stack. |
| 445 | */ |
| 446 | |
| 447 | #ifdef mkinit |
| 448 | MKINIT void shprocvar(void); |
| 449 | |
| 450 | SHELLPROC { |
| 451 | shprocvar(); |
| 452 | } |
| 453 | #endif |
| 454 | |
| 455 | void |
| 456 | shprocvar(void) |
| 457 | { |
| 458 | struct var **vpp; |
| 459 | struct var *vp, **prev; |
| 460 | |
| 461 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { |
| 462 | for (prev = vpp ; (vp = *prev) != NULL ; ) { |
| 463 | if ((vp->flags & VEXPORT) == 0) { |
| 464 | *prev = vp->next; |
| 465 | if ((vp->flags & VTEXTFIXED) == 0) |
| 466 | ckfree(vp->text); |
| 467 | if ((vp->flags & VSTRFIXED) == 0) |
| 468 | ckfree(vp); |
| 469 | } else { |
| 470 | if (vp->flags & VSTACK) { |
| 471 | vp->text = savestr(vp->text); |
| 472 | vp->flags &=~ VSTACK; |
| 473 | } |
| 474 | prev = &vp->next; |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | initvar(); |
| 479 | } |
| 480 | |
| 481 | |
| 482 | |
| 483 | /* |
| 484 | * Command to list all variables which are set. Currently this command |
| 485 | * is invoked from the set command when the set command is called without |
| 486 | * any variables. |
| 487 | */ |
| 488 | |
| 489 | int |
| 490 | showvarscmd(int argc __unused, char **argv __unused) |
| 491 | { |
| 492 | struct var **vpp; |
| 493 | struct var *vp; |
| 494 | const char *s; |
| 495 | |
| 496 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { |
| 497 | for (vp = *vpp ; vp ; vp = vp->next) { |
| 498 | if (vp->flags & VUNSET) |
| 499 | continue; |
| 500 | for (s = vp->text; *s != '='; s++) |
| 501 | out1c(*s); |
| 502 | out1c('='); |
| 503 | out1qstr(s + 1); |
| 504 | out1c('\n'); |
| 505 | } |
| 506 | } |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | |
| 511 | |
| 512 | /* |
| 513 | * The export and readonly commands. |
| 514 | */ |
| 515 | |
| 516 | int |
| 517 | exportcmd(int argc, char **argv) |
| 518 | { |
| 519 | struct var **vpp; |
| 520 | struct var *vp; |
| 521 | char *name; |
| 522 | char *p; |
| 523 | char *cmdname; |
| 524 | int ch, values; |
| 525 | int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; |
| 526 | |
| 527 | cmdname = argv[0]; |
| 528 | optreset = optind = 1; |
| 529 | opterr = 0; |
| 530 | values = 0; |
| 531 | while ((ch = getopt(argc, argv, "p")) != -1) { |
| 532 | switch (ch) { |
| 533 | case 'p': |
| 534 | values = 1; |
| 535 | break; |
| 536 | case '?': |
| 537 | default: |
| 538 | error("unknown option: -%c", optopt); |
| 539 | } |
| 540 | } |
| 541 | argc -= optind; |
| 542 | argv += optind; |
| 543 | |
| 544 | listsetvar(cmdenviron); |
| 545 | if (argc != 0) { |
| 546 | while ((name = *argptr++) != NULL) { |
| 547 | if ((p = strchr(name, '=')) != NULL) { |
| 548 | p++; |
| 549 | } else { |
| 550 | vpp = hashvar(name); |
| 551 | for (vp = *vpp ; vp ; vp = vp->next) { |
| 552 | if (varequal(vp->text, name)) { |
| 553 | |
| 554 | vp->flags |= flag; |
| 555 | if ((vp->flags & VEXPORT) && localevar(vp->text)) { |
| 556 | putenv(vp->text); |
| 557 | (void) setlocale(LC_ALL, ""); |
| 558 | } |
| 559 | goto found; |
| 560 | } |
| 561 | } |
| 562 | } |
| 563 | setvar(name, p, flag); |
| 564 | found:; |
| 565 | } |
| 566 | } else { |
| 567 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { |
| 568 | for (vp = *vpp ; vp ; vp = vp->next) { |
| 569 | if (vp->flags & flag) { |
| 570 | if (values) { |
| 571 | out1str(cmdname); |
| 572 | out1c(' '); |
| 573 | } |
| 574 | for (p = vp->text ; *p != '=' ; p++) |
| 575 | out1c(*p); |
| 576 | if (values && !(vp->flags & VUNSET)) { |
| 577 | out1c('='); |
| 578 | out1qstr(p + 1); |
| 579 | } |
| 580 | out1c('\n'); |
| 581 | } |
| 582 | } |
| 583 | } |
| 584 | } |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | |
| 589 | /* |
| 590 | * The "local" command. |
| 591 | */ |
| 592 | |
| 593 | int |
| 594 | localcmd(int argc __unused, char **argv __unused) |
| 595 | { |
| 596 | char *name; |
| 597 | |
| 598 | if (! in_function()) |
| 599 | error("Not in a function"); |
| 600 | while ((name = *argptr++) != NULL) { |
| 601 | mklocal(name); |
| 602 | } |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | |
| 607 | /* |
| 608 | * Make a variable a local variable. When a variable is made local, it's |
| 609 | * value and flags are saved in a localvar structure. The saved values |
| 610 | * will be restored when the shell function returns. We handle the name |
| 611 | * "-" as a special case. |
| 612 | */ |
| 613 | |
| 614 | void |
| 615 | mklocal(char *name) |
| 616 | { |
| 617 | struct localvar *lvp; |
| 618 | struct var **vpp; |
| 619 | struct var *vp; |
| 620 | |
| 621 | INTOFF; |
| 622 | lvp = ckmalloc(sizeof (struct localvar)); |
| 623 | if (name[0] == '-' && name[1] == '\0') { |
| 624 | lvp->text = ckmalloc(sizeof optlist); |
| 625 | memcpy(lvp->text, optlist, sizeof optlist); |
| 626 | vp = NULL; |
| 627 | } else { |
| 628 | vpp = hashvar(name); |
| 629 | for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next); |
| 630 | if (vp == NULL) { |
| 631 | if (strchr(name, '=')) |
| 632 | setvareq(savestr(name), VSTRFIXED); |
| 633 | else |
| 634 | setvar(name, NULL, VSTRFIXED); |
| 635 | vp = *vpp; /* the new variable */ |
| 636 | lvp->text = NULL; |
| 637 | lvp->flags = VUNSET; |
| 638 | } else { |
| 639 | lvp->text = vp->text; |
| 640 | lvp->flags = vp->flags; |
| 641 | vp->flags |= VSTRFIXED|VTEXTFIXED; |
| 642 | if (strchr(name, '=')) |
| 643 | setvareq(savestr(name), 0); |
| 644 | } |
| 645 | } |
| 646 | lvp->vp = vp; |
| 647 | lvp->next = localvars; |
| 648 | localvars = lvp; |
| 649 | INTON; |
| 650 | } |
| 651 | |
| 652 | |
| 653 | /* |
| 654 | * Called after a function returns. |
| 655 | */ |
| 656 | |
| 657 | void |
| 658 | poplocalvars(void) |
| 659 | { |
| 660 | struct localvar *lvp; |
| 661 | struct var *vp; |
| 662 | |
| 663 | while ((lvp = localvars) != NULL) { |
| 664 | localvars = lvp->next; |
| 665 | vp = lvp->vp; |
| 666 | if (vp == NULL) { /* $- saved */ |
| 667 | memcpy(optlist, lvp->text, sizeof optlist); |
| 668 | ckfree(lvp->text); |
| 669 | } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { |
| 670 | (void)unsetvar(vp->text); |
| 671 | } else { |
| 672 | if ((vp->flags & VTEXTFIXED) == 0) |
| 673 | ckfree(vp->text); |
| 674 | vp->flags = lvp->flags; |
| 675 | vp->text = lvp->text; |
| 676 | } |
| 677 | ckfree(lvp); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | |
| 682 | int |
| 683 | setvarcmd(int argc, char **argv) |
| 684 | { |
| 685 | if (argc <= 2) |
| 686 | return unsetcmd(argc, argv); |
| 687 | else if (argc == 3) |
| 688 | setvar(argv[1], argv[2], 0); |
| 689 | else |
| 690 | error("List assignment not implemented"); |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | |
| 695 | /* |
| 696 | * The unset builtin command. We unset the function before we unset the |
| 697 | * variable to allow a function to be unset when there is a readonly variable |
| 698 | * with the same name. |
| 699 | */ |
| 700 | |
| 701 | int |
| 702 | unsetcmd(int argc __unused, char **argv __unused) |
| 703 | { |
| 704 | char **ap; |
| 705 | int i; |
| 706 | int flg_func = 0; |
| 707 | int flg_var = 0; |
| 708 | int ret = 0; |
| 709 | |
| 710 | while ((i = nextopt("vf")) != '\0') { |
| 711 | if (i == 'f') |
| 712 | flg_func = 1; |
| 713 | else |
| 714 | flg_var = 1; |
| 715 | } |
| 716 | if (flg_func == 0 && flg_var == 0) |
| 717 | flg_var = 1; |
| 718 | |
| 719 | for (ap = argptr; *ap ; ap++) { |
| 720 | if (flg_func) |
| 721 | ret |= unsetfunc(*ap); |
| 722 | if (flg_var) |
| 723 | ret |= unsetvar(*ap); |
| 724 | } |
| 725 | return ret; |
| 726 | } |
| 727 | |
| 728 | |
| 729 | /* |
| 730 | * Unset the specified variable. |
| 731 | */ |
| 732 | |
| 733 | int |
| 734 | unsetvar(const char *s) |
| 735 | { |
| 736 | struct var **vpp; |
| 737 | struct var *vp; |
| 738 | |
| 739 | vpp = hashvar(s); |
| 740 | for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { |
| 741 | if (varequal(vp->text, s)) { |
| 742 | if (vp->flags & VREADONLY) |
| 743 | return (1); |
| 744 | INTOFF; |
| 745 | if (*(strchr(vp->text, '=') + 1) != '\0') |
| 746 | setvar(s, nullstr, 0); |
| 747 | if ((vp->flags & VEXPORT) && localevar(vp->text)) { |
| 748 | unsetenv(s); |
| 749 | setlocale(LC_ALL, ""); |
| 750 | } |
| 751 | vp->flags &= ~VEXPORT; |
| 752 | vp->flags |= VUNSET; |
| 753 | if ((vp->flags & VSTRFIXED) == 0) { |
| 754 | if ((vp->flags & VTEXTFIXED) == 0) |
| 755 | ckfree(vp->text); |
| 756 | *vpp = vp->next; |
| 757 | ckfree(vp); |
| 758 | } |
| 759 | INTON; |
| 760 | return (0); |
| 761 | } |
| 762 | } |
| 763 | return (0); |
| 764 | } |
| 765 | |
| 766 | |
| 767 | |
| 768 | /* |
| 769 | * Find the appropriate entry in the hash table from the name. |
| 770 | */ |
| 771 | |
| 772 | STATIC struct var ** |
| 773 | hashvar(const char *p) |
| 774 | { |
| 775 | unsigned int hashval; |
| 776 | |
| 777 | hashval = ((unsigned char) *p) << 4; |
| 778 | while (*p && *p != '=') |
| 779 | hashval += (unsigned char) *p++; |
| 780 | return &vartab[hashval % VTABSIZE]; |
| 781 | } |
| 782 | |
| 783 | |
| 784 | |
| 785 | /* |
| 786 | * Returns true if the two strings specify the same varable. The first |
| 787 | * variable name is terminated by '='; the second may be terminated by |
| 788 | * either '=' or '\0'. |
| 789 | */ |
| 790 | |
| 791 | STATIC int |
| 792 | varequal(const char *p, const char *q) |
| 793 | { |
| 794 | while (*p == *q++) { |
| 795 | if (*p++ == '=') |
| 796 | return 1; |
| 797 | } |
| 798 | if (*p == '=' && *(q - 1) == '\0') |
| 799 | return 1; |
| 800 | return 0; |
| 801 | } |