1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1982-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * David Korn <dgk@research.att.com> * 18 * * 19 ***********************************************************************/ 20 #pragma prototyped 21 /* 22 * UNIX shell 23 * 24 * S. R. Bourne 25 * Rewritten by David Korn 26 * AT&T Labs 27 * 28 */ 29 30 #include "defs.h" 31 #include "path.h" 32 #include "builtins.h" 33 #include "terminal.h" 34 #include "edit.h" 35 #include "FEATURE/poll" 36 #if SHOPT_KIA 37 # include "shlex.h" 38 # include "io.h" 39 #endif /* SHOPT_KIA */ 40 #if SHOPT_PFSH 41 # define PFSHOPT "P" 42 #else 43 # define PFSHOPT 44 #endif 45 #if SHOPT_BASH 46 # define BASHOPT "\374" 47 #else 48 # define BASHOPT 49 #endif 50 #if SHOPT_HISTEXPAND 51 # define HFLAG "H" 52 #else 53 # define HFLAG "" 54 #endif 55 56 #define SORT 1 57 #define PRINT 2 58 59 static char *null; 60 61 /* The following order is determined by sh_optset */ 62 static const char optksh[] = PFSHOPT BASHOPT "DircabefhkmnpstuvxBCGEl" HFLAG; 63 static const int flagval[] = 64 { 65 #if SHOPT_PFSH 66 SH_PFSH, 67 #endif 68 #if SHOPT_BASH 69 SH_POSIX, 70 #endif 71 SH_DICTIONARY, SH_INTERACTIVE, SH_RESTRICTED, SH_CFLAG, 72 SH_ALLEXPORT, SH_NOTIFY, SH_ERREXIT, SH_NOGLOB, SH_TRACKALL, 73 SH_KEYWORD, SH_MONITOR, SH_NOEXEC, SH_PRIVILEGED, SH_SFLAG, SH_TFLAG, 74 SH_NOUNSET, SH_VERBOSE, SH_XTRACE, SH_BRACEEXPAND, SH_NOCLOBBER, 75 SH_GLOBSTARS, SH_RC, SH_LOGIN_SHELL, 76 #if SHOPT_HISTEXPAND 77 SH_HISTEXPAND, 78 #endif 79 0 80 }; 81 82 #define NUM_OPTS (sizeof(flagval)/sizeof(*flagval)) 83 84 typedef struct _arg_ 85 { 86 Shell_t *sh; 87 struct dolnod *argfor; /* linked list of blocks to be cleaned up */ 88 struct dolnod *dolh; 89 char flagadr[NUM_OPTS+1]; 90 #if SHOPT_KIA 91 char *kiafile; 92 #endif /* SHOPT_KIA */ 93 } Arg_t; 94 95 static int arg_expand(Shell_t*,struct argnod*,struct argnod**,int); 96 static void sh_argset(Arg_t*, char *[]); 97 98 99 /* ======== option handling ======== */ 100 101 void *sh_argopen(Shell_t *shp) 102 { 103 void *addr = newof(0,Arg_t,1,0); 104 Arg_t *ap = (Arg_t*)addr; 105 ap->sh = shp; 106 return(addr); 107 } 108 109 static int infof(Opt_t* op, Sfio_t* sp, const char* s, Optdisc_t* dp) 110 { 111 #if SHOPT_BASH 112 extern const char sh_bash1[], sh_bash2[]; 113 if(strcmp(s,"bash1")==0) 114 { 115 if(sh_isoption(SH_BASH)) 116 sfputr(sp,sh_bash1,-1); 117 } 118 else if(strcmp(s,"bash2")==0) 119 { 120 if(sh_isoption(SH_BASH)) 121 sfputr(sp,sh_bash2,-1); 122 } 123 else if(*s==':' && sh_isoption(SH_BASH)) 124 sfputr(sp,s,-1); 125 else 126 #endif 127 if(*s!=':') 128 sfputr(sp,sh_set,-1); 129 return(1); 130 } 131 132 /* 133 * This routine turns options on and off 134 * The options "PDicr" are illegal from set command. 135 * The -o option is used to set option by name 136 * This routine returns the number of non-option arguments 137 */ 138 int sh_argopts(int argc,register char *argv[], void *context) 139 { 140 Shell_t *shp = (Shell_t*)context; 141 register int n,o; 142 register Arg_t *ap = (Arg_t*)(shp->arg_context); 143 Lex_t *lp = (Lex_t*)(shp->lex_context); 144 Shopt_t newflags; 145 int setflag=0, action=0, trace=(int)sh_isoption(SH_XTRACE); 146 Namval_t *np = NIL(Namval_t*); 147 const char *cp; 148 int verbose,f; 149 Optdisc_t disc; 150 newflags=ap->sh->options; 151 memset(&disc, 0, sizeof(disc)); 152 disc.version = OPT_VERSION; 153 disc.infof = infof; 154 opt_info.disc = &disc; 155 156 if(argc>0) 157 setflag = 4; 158 else 159 argc = -argc; 160 while((n = optget(argv,setflag?sh_optset:sh_optksh))) 161 { 162 o=0; 163 f=*opt_info.option=='-' && (opt_info.num || opt_info.arg); 164 switch(n) 165 { 166 case 'A': 167 np = nv_open(opt_info.arg,ap->sh->var_tree,NV_NOASSIGN|NV_ARRAY|NV_VARNAME); 168 if(f) 169 nv_unset(np); 170 continue; 171 #if SHOPT_BASH 172 case 'O': /* shopt options, only in bash mode */ 173 if(!sh_isoption(SH_BASH)) 174 errormsg(SH_DICT,ERROR_exit(1), e_option, opt_info.name); 175 #endif 176 case 'o': /* set options */ 177 byname: 178 if(!opt_info.arg||!*opt_info.arg||*opt_info.arg=='-') 179 { 180 action = PRINT; 181 /* print style: -O => shopt options 182 * bash => print unset options also, no heading 183 */ 184 verbose = (f?PRINT_VERBOSE:PRINT_NO_HEADER)| 185 (n=='O'?PRINT_SHOPT:0)| 186 (sh_isoption(SH_BASH)?PRINT_ALL|PRINT_NO_HEADER:0)| 187 ((opt_info.arg&&(!*opt_info.arg||*opt_info.arg=='-'))?(PRINT_TABLE|PRINT_NO_HEADER):0); 188 continue; 189 } 190 o = sh_lookopt(opt_info.arg,&f); 191 if(o<=0 192 || (!sh_isoption(SH_BASH) && (o&SH_BASHEXTRA)) 193 || ((!sh_isoption(SH_BASH) || n=='o') && (o&SH_BASHOPT)) 194 195 || (setflag && (o&SH_COMMANDLINE))) 196 { 197 errormsg(SH_DICT,2, e_option, opt_info.arg); 198 error_info.errors++; 199 } 200 o &= 0xff; 201 if(sh_isoption(SH_RESTRICTED) && !f && o==SH_RESTRICTED) 202 errormsg(SH_DICT,ERROR_exit(1), e_restricted, opt_info.arg); 203 break; 204 #if SHOPT_BASH 205 case -1: /* --rcfile */ 206 ap->sh->rcfile = opt_info.arg; 207 continue; 208 case -2: /* --noediting */ 209 if (!f) 210 { 211 off_option(&newflags,SH_VI); 212 off_option(&newflags,SH_EMACS); 213 off_option(&newflags,SH_GMACS); 214 } 215 continue; 216 case -3: /* --profile */ 217 n = 'l'; 218 goto skip; 219 case -4: /* --posix */ 220 /* mask lower 8 bits to find char in optksh string */ 221 n&=0xff; 222 goto skip; 223 case -5: /* --version */ 224 sfputr(sfstdout, "ksh bash emulation, version ",-1); 225 np = nv_open("BASH_VERSION",ap->sh->var_tree,0); 226 sfputr(sfstdout, nv_getval(np),-1); 227 np = nv_open("MACHTYPE",ap->sh->var_tree,0); 228 sfprintf(sfstdout, " (%s)\n", nv_getval(np)); 229 sh_exit(0); 230 #endif 231 case -6: /* --default */ 232 { 233 register const Shtable_t *tp; 234 for(tp=shtab_options; o = tp->sh_number; tp++) 235 if(!(o&SH_COMMANDLINE) && is_option(&newflags,o&0xff)) 236 off_option(&newflags,o&0xff); 237 } 238 continue; 239 case -7: 240 f = 0; 241 goto byname; 242 case 'D': 243 on_option(&newflags,SH_NOEXEC); 244 goto skip; 245 case 'T': 246 if (opt_info.num) 247 ap->sh->test |= opt_info.num; 248 else 249 ap->sh->test = 0; 250 continue; 251 case 's': 252 if(setflag) 253 { 254 action = SORT; 255 continue; 256 } 257 #if SHOPT_KIA 258 goto skip; 259 case 'R': 260 if(setflag) 261 n = ':'; 262 else 263 { 264 ap->kiafile = opt_info.arg; 265 n = 'n'; 266 } 267 /* FALL THRU */ 268 #endif /* SHOPT_KIA */ 269 skip: 270 default: 271 if(cp=strchr(optksh,n)) 272 o = flagval[cp-optksh]; 273 break; 274 case ':': 275 if(opt_info.name[0]=='-'&&opt_info.name[1]=='-') 276 { 277 opt_info.arg = argv[opt_info.index-1] + 2; 278 f = 1; 279 goto byname; 280 } 281 errormsg(SH_DICT,2, "%s", opt_info.arg); 282 continue; 283 case '?': 284 errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg); 285 return(-1); 286 } 287 if(f) 288 { 289 if(o==SH_VI || o==SH_EMACS || o==SH_GMACS) 290 { 291 off_option(&newflags,SH_VI); 292 off_option(&newflags,SH_EMACS); 293 off_option(&newflags,SH_GMACS); 294 } 295 on_option(&newflags,o); 296 off_option(&ap->sh->offoptions,o); 297 } 298 else 299 { 300 if(o==SH_XTRACE) 301 trace = 0; 302 off_option(&newflags,o); 303 if(setflag==0) 304 on_option(&ap->sh->offoptions,o); 305 } 306 } 307 if(error_info.errors) 308 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage(NIL(char*))); 309 /* check for '-' or '+' argument */ 310 if((cp=argv[opt_info.index]) && cp[1]==0 && (*cp=='+' || *cp=='-') && 311 strcmp(argv[opt_info.index-1],"--")) 312 { 313 opt_info.index++; 314 off_option(&newflags,SH_XTRACE); 315 off_option(&newflags,SH_VERBOSE); 316 trace = 0; 317 } 318 if(trace) 319 sh_trace(argv,1); 320 argc -= opt_info.index; 321 argv += opt_info.index; 322 if(action==PRINT) 323 sh_printopts(newflags,verbose,0); 324 if(setflag) 325 { 326 if(action==SORT) 327 { 328 if(argc>0) 329 strsort(argv,argc,strcoll); 330 else 331 strsort(ap->sh->st.dolv+1,ap->sh->st.dolc,strcoll); 332 } 333 if(np) 334 { 335 nv_setvec(np,0,argc,argv); 336 nv_close(np); 337 } 338 else if(argc>0 || ((cp=argv[-1]) && strcmp(cp,"--")==0)) 339 sh_argset(ap,argv-1); 340 } 341 else if(is_option(&newflags,SH_CFLAG)) 342 { 343 if(!(ap->sh->comdiv = *argv++)) 344 { 345 errormsg(SH_DICT,2,e_cneedsarg); 346 errormsg(SH_DICT,ERROR_usage(2),optusage(NIL(char*))); 347 } 348 argc--; 349 } 350 /* handling SH_INTERACTIVE and SH_PRIVILEGED has been moved to 351 * sh_applyopts(), so that the code can be reused from b_shopt(), too 352 */ 353 sh_applyopts(ap->sh,newflags); 354 #if SHOPT_KIA 355 if(ap->kiafile) 356 { 357 if(!argv[0]) 358 errormsg(SH_DICT,ERROR_usage(2),"-R requires scriptname"); 359 if(!(lp->kiafile=sfopen(NIL(Sfio_t*),ap->kiafile,"w+"))) 360 errormsg(SH_DICT,ERROR_system(3),e_create,ap->kiafile); 361 if(!(lp->kiatmp=sftmp(2*SF_BUFSIZE))) 362 errormsg(SH_DICT,ERROR_system(3),e_tmpcreate); 363 sfputr(lp->kiafile,";vdb;CIAO/ksh",'\n'); 364 lp->kiabegin = sftell(lp->kiafile); 365 lp->entity_tree = dtopen(&_Nvdisc,Dtbag); 366 lp->scriptname = strdup(sh_fmtq(argv[0])); 367 lp->script=kiaentity(lp,lp->scriptname,-1,'p',-1,0,0,'s',0,""); 368 lp->fscript=kiaentity(lp,lp->scriptname,-1,'f',-1,0,0,'s',0,""); 369 lp->unknown=kiaentity(lp,"<unknown>",-1,'p',-1,0,0,'0',0,""); 370 kiaentity(lp,"<unknown>",-1,'p',0,0,lp->unknown,'0',0,""); 371 lp->current = lp->script; 372 ap->kiafile = 0; 373 } 374 #endif /* SHOPT_KIA */ 375 return(argc); 376 } 377 378 /* apply new options */ 379 380 void sh_applyopts(Shell_t* shp,Shopt_t newflags) 381 { 382 /* cannot set -n for interactive shells since there is no way out */ 383 if(sh_isoption(SH_INTERACTIVE)) 384 off_option(&newflags,SH_NOEXEC); 385 if(is_option(&newflags,SH_PRIVILEGED)) 386 on_option(&newflags,SH_NOUSRPROFILE); 387 if(is_option(&newflags,SH_PRIVILEGED) != sh_isoption(SH_PRIVILEGED)) 388 { 389 if(sh_isoption(SH_PRIVILEGED)) 390 { 391 setuid(shp->userid); 392 setgid(shp->groupid); 393 if(shp->euserid==0) 394 { 395 shp->euserid = shp->userid; 396 shp->egroupid = shp->groupid; 397 } 398 } 399 else if((shp->userid!=shp->euserid && setuid(shp->euserid)<0) || 400 (shp->groupid!=shp->egroupid && setgid(shp->egroupid)<0) || 401 (shp->userid==shp->euserid && shp->groupid==shp->egroupid)) 402 off_option(&newflags,SH_PRIVILEGED); 403 } 404 #if SHOPT_BASH 405 on_option(&newflags,SH_CMDHIST); 406 on_option(&newflags,SH_CHECKHASH); 407 on_option(&newflags,SH_EXECFAIL); 408 on_option(&newflags,SH_EXPAND_ALIASES); 409 on_option(&newflags,SH_HISTAPPEND); 410 on_option(&newflags,SH_INTERACTIVE_COMM); 411 on_option(&newflags,SH_LITHIST); 412 on_option(&newflags,SH_NOEMPTYCMDCOMPL); 413 414 if(!is_option(&newflags,SH_XPG_ECHO) && sh_isoption(SH_XPG_ECHO)) 415 astconf("UNIVERSE", 0, "ucb"); 416 if(is_option(&newflags,SH_XPG_ECHO) && !sh_isoption(SH_XPG_ECHO)) 417 astconf("UNIVERSE", 0, "att"); 418 if(!is_option(&newflags,SH_PHYSICAL) && sh_isoption(SH_PHYSICAL)) 419 astconf("PATH_RESOLVE", 0, "metaphysical"); 420 if(is_option(&newflags,SH_PHYSICAL) && !sh_isoption(SH_PHYSICAL)) 421 astconf("PATH_RESOLVE", 0, "physical"); 422 if(is_option(&newflags,SH_HISTORY2) && !sh_isoption(SH_HISTORY2)) 423 { 424 sh_onstate(SH_HISTORY); 425 sh_onoption(SH_HISTORY); 426 } 427 if(!is_option(&newflags,SH_HISTORY2) && sh_isoption(SH_HISTORY2)) 428 { 429 sh_offstate(SH_HISTORY); 430 sh_offoption(SH_HISTORY); 431 } 432 #endif 433 shp->options = newflags; 434 } 435 436 /* 437 * returns the value of $- 438 */ 439 char *sh_argdolminus(void* context) 440 { 441 register Arg_t *ap = (Arg_t*)context; 442 register const char *cp=optksh; 443 register char *flagp=ap->flagadr; 444 while(cp< &optksh[NUM_OPTS]) 445 { 446 int n = flagval[cp-optksh]; 447 if(sh_isoption(n)) 448 *flagp++ = *cp; 449 cp++; 450 } 451 *flagp = 0; 452 return(ap->flagadr); 453 } 454 455 /* 456 * set up positional parameters 457 */ 458 static void sh_argset(Arg_t *ap,char *argv[]) 459 { 460 sh_argfree(ap->sh,ap->dolh,0); 461 ap->dolh = sh_argcreate(argv); 462 /* link into chain */ 463 ap->dolh->dolnxt = ap->argfor; 464 ap->argfor = ap->dolh; 465 ap->sh->st.dolc = ap->dolh->dolnum-1; 466 ap->sh->st.dolv = ap->dolh->dolval; 467 } 468 469 /* 470 * free the argument list if the use count is 1 471 * If count is greater than 1 decrement count and return same blk 472 * Free the argument list if the use count is 1 and return next blk 473 * Delete the blk from the argfor chain 474 * If flag is set, then the block dolh is not freed 475 */ 476 struct dolnod *sh_argfree(Shell_t *shp, struct dolnod *blk,int flag) 477 { 478 register struct dolnod* argr=blk; 479 register struct dolnod* argblk; 480 register Arg_t *ap = (Arg_t*)shp->arg_context; 481 if(argblk=argr) 482 { 483 if((--argblk->dolrefcnt)==0) 484 { 485 argr = argblk->dolnxt; 486 if(flag && argblk==ap->dolh) 487 ap->dolh->dolrefcnt = 1; 488 else 489 { 490 /* delete from chain */ 491 if(ap->argfor == argblk) 492 ap->argfor = argblk->dolnxt; 493 else 494 { 495 for(argr=ap->argfor;argr;argr=argr->dolnxt) 496 if(argr->dolnxt==argblk) 497 break; 498 if(!argr) 499 return(NIL(struct dolnod*)); 500 argr->dolnxt = argblk->dolnxt; 501 argr = argblk->dolnxt; 502 } 503 free((void*)argblk); 504 } 505 } 506 } 507 return(argr); 508 } 509 510 /* 511 * grab space for arglist and copy args 512 * The strings are copied after the argment vector 513 */ 514 struct dolnod *sh_argcreate(register char *argv[]) 515 { 516 register struct dolnod *dp; 517 register char **pp=argv, *sp; 518 register int size=0,n; 519 /* count args and number of bytes of arglist */ 520 while(sp= *pp++) 521 size += strlen(sp); 522 n = (pp - argv)-1; 523 dp=new_of(struct dolnod,n*sizeof(char*)+size+n); 524 dp->dolrefcnt=1; /* use count */ 525 dp->dolnum = n; 526 dp->dolnxt = 0; 527 pp = dp->dolval; 528 sp = (char*)dp + sizeof(struct dolnod) + n*sizeof(char*); 529 while(n--) 530 { 531 *pp++ = sp; 532 sp = strcopy(sp, *argv++) + 1; 533 } 534 *pp = NIL(char*); 535 return(dp); 536 } 537 538 /* 539 * used to set new arguments for functions 540 */ 541 struct dolnod *sh_argnew(Shell_t *shp,char *argi[], struct dolnod **savargfor) 542 { 543 register Arg_t *ap = (Arg_t*)shp->arg_context; 544 register struct dolnod *olddolh = ap->dolh; 545 *savargfor = ap->argfor; 546 ap->dolh = 0; 547 ap->argfor = 0; 548 sh_argset(ap,argi); 549 return(olddolh); 550 } 551 552 /* 553 * reset arguments as they were before function 554 */ 555 void sh_argreset(Shell_t *shp,struct dolnod *blk, struct dolnod *afor) 556 { 557 register Arg_t *ap = (Arg_t*)shp->arg_context; 558 while(ap->argfor=sh_argfree(shp,ap->argfor,0)); 559 ap->argfor = afor; 560 if(ap->dolh = blk) 561 { 562 shp->st.dolc = ap->dolh->dolnum-1; 563 shp->st.dolv = ap->dolh->dolval; 564 } 565 } 566 567 /* 568 * increase the use count so that an sh_argset will not make it go away 569 */ 570 struct dolnod *sh_arguse(Shell_t* shp) 571 { 572 register struct dolnod *dh; 573 register Arg_t *ap = (Arg_t*)shp->arg_context; 574 if(dh=ap->dolh) 575 dh->dolrefcnt++; 576 return(dh); 577 } 578 579 /* 580 * Print option settings on standard output 581 * if mode is inclusive or of PRINT_* 582 * if <mask> is set, only options with this mask value are displayed 583 */ 584 void sh_printopts(Shopt_t oflags,register int mode, Shopt_t *mask) 585 { 586 register const Shtable_t *tp; 587 const char *name; 588 int on; 589 int value; 590 if(!(mode&PRINT_NO_HEADER)) 591 sfputr(sfstdout,sh_translate(e_heading),'\n'); 592 if(mode&PRINT_TABLE) 593 { 594 int w; 595 int c; 596 int r; 597 int i; 598 599 c = 0; 600 for(tp=shtab_options; value=tp->sh_number; tp++) 601 { 602 if(mask && !is_option(mask,value&0xff)) 603 continue; 604 name = tp->sh_name; 605 if(name[0] == 'n' && name[1] == 'o' && name[2] != 't') 606 name += 2; 607 if(c<(w=strlen(name))) 608 c = w; 609 } 610 c += 4; 611 if((w = ed_window()) < (2*c)) 612 w = 2*c; 613 r = w / c; 614 i = 0; 615 for(tp=shtab_options; value=tp->sh_number; tp++) 616 { 617 if(mask && !is_option(mask,value&0xff)) 618 continue; 619 on = !!is_option(&oflags,value); 620 value &= 0xff; 621 name = tp->sh_name; 622 if(name[0] == 'n' && name[1] == 'o' && name[2] != 't') 623 { 624 name += 2; 625 on = !on; 626 } 627 if(++i>=r) 628 { 629 i = 0; 630 sfprintf(sfstdout, "%s%s\n", on ? "" : "no", name); 631 } 632 else 633 sfprintf(sfstdout, "%s%-*s", on ? "" : "no", on ? c : (c-2), name); 634 } 635 if(i) 636 sfputc(sfstdout,'\n'); 637 return; 638 } 639 #if SHOPT_RAWONLY 640 on_option(&oflags,SH_VIRAW); 641 #endif 642 if(!(mode&(PRINT_ALL|PRINT_VERBOSE))) /* only print set options */ 643 { 644 if(mode&PRINT_SHOPT) 645 sfwrite(sfstdout,"shopt -s",3); 646 else 647 sfwrite(sfstdout,"set --default",13); 648 } 649 for(tp=shtab_options; value=tp->sh_number; tp++) 650 { 651 if(mask && !is_option(mask,value&0xff)) 652 continue; 653 if(sh_isoption(SH_BASH)) 654 { 655 if (!(mode&PRINT_SHOPT) != !(value&SH_BASHOPT)) 656 continue; 657 } 658 else if (value&(SH_BASHEXTRA|SH_BASHOPT)) 659 continue; 660 on = !!is_option(&oflags,value); 661 name = tp->sh_name; 662 if(name[0] == 'n' && name[1] == 'o' && name[2] != 't') 663 { 664 name += 2; 665 on = !on; 666 } 667 if(mode&PRINT_VERBOSE) 668 { 669 sfputr(sfstdout,name,' '); 670 sfnputc(sfstdout,' ',24-strlen(name)); 671 sfputr(sfstdout,on ? sh_translate(e_on) : sh_translate(e_off),'\n'); 672 } 673 else if(mode&PRINT_ALL) /* print unset options also */ 674 { 675 if(mode&PRINT_SHOPT) 676 sfprintf(sfstdout, "shopt -%c %s\n", 677 on?'s':'u', 678 name); 679 else 680 sfprintf(sfstdout, "set %co %s\n", 681 on?'-':'+', 682 name); 683 } 684 else if(!(value&SH_COMMANDLINE) && is_option(&oflags,value&0xff)) 685 sfprintf(sfstdout," %s%s%s",(mode&PRINT_SHOPT)?"":"--",on?"":"no",name); 686 } 687 if(!(mode&(PRINT_VERBOSE|PRINT_ALL))) 688 sfputc(sfstdout,'\n'); 689 } 690 691 /* 692 * build an argument list 693 */ 694 char **sh_argbuild(Shell_t *shp,int *nargs, const struct comnod *comptr,int flag) 695 { 696 register struct argnod *argp; 697 struct argnod *arghead=0; 698 shp->xargmin = 0; 699 { 700 register const struct comnod *ac = comptr; 701 register int n; 702 /* see if the arguments have already been expanded */ 703 if(!ac->comarg) 704 { 705 *nargs = 0; 706 return(&null); 707 } 708 else if(!(ac->comtyp&COMSCAN)) 709 { 710 register struct dolnod *ap = (struct dolnod*)ac->comarg; 711 *nargs = ap->dolnum; 712 return(ap->dolval+ap->dolbot); 713 } 714 shp->lastpath = 0; 715 *nargs = 0; 716 if(ac) 717 { 718 if(ac->comnamp == SYSLET) 719 flag |= ARG_LET; 720 argp = ac->comarg; 721 while(argp) 722 { 723 n = arg_expand(shp,argp,&arghead,flag); 724 if(n>1) 725 { 726 if(shp->xargmin==0) 727 shp->xargmin = *nargs; 728 shp->xargmax = *nargs+n; 729 } 730 *nargs += n; 731 argp = argp->argnxt.ap; 732 } 733 argp = arghead; 734 } 735 } 736 { 737 register char **comargn; 738 register int argn; 739 register char **comargm; 740 argn = *nargs; 741 /* allow room to prepend args */ 742 argn += 1; 743 744 comargn=(char**)stkalloc(shp->stk,(unsigned)(argn+1)*sizeof(char*)); 745 comargm = comargn += argn; 746 *comargn = NIL(char*); 747 if(!argp) 748 { 749 /* reserve an extra null pointer */ 750 *--comargn = 0; 751 return(comargn); 752 } 753 while(argp) 754 { 755 struct argnod *nextarg = argp->argchn.ap; 756 argp->argchn.ap = 0; 757 *--comargn = argp->argval; 758 if(!(argp->argflag&ARG_RAW)) 759 sh_trim(*comargn); 760 if(!(argp=nextarg) || (argp->argflag&ARG_MAKE)) 761 { 762 if((argn=comargm-comargn)>1) 763 strsort(comargn,argn,strcoll); 764 comargm = comargn; 765 } 766 } 767 shp->last_table = 0; 768 return(comargn); 769 } 770 } 771 772 #if _pipe_socketpair && !_socketpair_devfd 773 # define sh_pipe arg_pipe 774 /* 775 * create a real pipe (not a socket) and print message on failure 776 */ 777 static int arg_pipe(register int pv[]) 778 { 779 int fd[2]; 780 if(pipe(fd)<0 || (pv[0]=fd[0])<0 || (pv[1]=fd[1])<0) 781 errormsg(SH_DICT,ERROR_system(1),e_pipe); 782 pv[0] = sh_iomovefd(pv[0]); 783 pv[1] = sh_iomovefd(pv[1]); 784 sh.fdstatus[pv[0]] = IONOSEEK|IOREAD; 785 sh.fdstatus[pv[1]] = IONOSEEK|IOWRITE; 786 sh_subsavefd(pv[0]); 787 sh_subsavefd(pv[1]); 788 return(0); 789 } 790 #endif 791 792 /* Argument expansion */ 793 static int arg_expand(Shell_t *shp,register struct argnod *argp, struct argnod **argchain,int flag) 794 { 795 register int count = 0; 796 argp->argflag &= ~ARG_MAKE; 797 #if SHOPT_DEVFD 798 if(*argp->argval==0 && (argp->argflag&ARG_EXP)) 799 { 800 /* argument of the form (cmd) */ 801 register struct argnod *ap; 802 int monitor, fd, pv[2]; 803 ap = (struct argnod*)stkseek(shp->stk,ARGVAL); 804 ap->argflag |= ARG_MAKE; 805 ap->argflag &= ~ARG_RAW; 806 ap->argchn.ap = *argchain; 807 *argchain = ap; 808 count++; 809 sfwrite(shp->stk,e_devfdNN,8); 810 sh_pipe(pv); 811 fd = argp->argflag&ARG_RAW; 812 sfputr(shp->stk,fmtbase((long)pv[fd],10,0),0); 813 ap = (struct argnod*)stkfreeze(shp->stk,0); 814 shp->inpipe = shp->outpipe = 0; 815 if(monitor = (sh_isstate(SH_MONITOR)!=0)) 816 sh_offstate(SH_MONITOR); 817 if(fd) 818 { 819 shp->inpipe = pv; 820 sh_exec((Shnode_t*)argp->argchn.ap,(int)sh_isstate(SH_ERREXIT)); 821 } 822 else 823 { 824 shp->outpipe = pv; 825 sh_exec((Shnode_t*)argp->argchn.ap,(int)sh_isstate(SH_ERREXIT)); 826 } 827 if(monitor) 828 sh_onstate(SH_MONITOR); 829 close(pv[1-fd]); 830 sh_iosave(shp,-pv[fd], shp->topfd, (char*)0); 831 } 832 else 833 #endif /* SHOPT_DEVFD */ 834 if(!(argp->argflag&ARG_RAW)) 835 { 836 #if SHOPT_OPTIMIZE 837 struct argnod *ap; 838 sh_stats(STAT_ARGEXPAND); 839 if(flag&ARG_OPTIMIZE) 840 argp->argchn.ap=0; 841 if(ap=argp->argchn.ap) 842 { 843 sh_stats(STAT_ARGHITS); 844 count = 1; 845 ap->argchn.ap = *argchain; 846 ap->argflag |= ARG_RAW; 847 ap->argflag &= ~ARG_EXP; 848 *argchain = ap; 849 } 850 else 851 #endif /* SHOPT_OPTIMIZE */ 852 count = sh_macexpand(shp,argp,argchain,flag); 853 } 854 else 855 { 856 argp->argchn.ap = *argchain; 857 *argchain = argp; 858 argp->argflag |= ARG_MAKE; 859 count++; 860 } 861 return(count); 862 } 863 864