bin/sh/options.c

   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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)options.c   8.2 (Berkeley) 5/4/95";
  36 #endif
  37 #endif /* not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include <signal.h>
  42 #include <unistd.h>
  43 #include <stdlib.h>
  44
  45 #include "shell.h"
  46 #define DEFINE_OPTIONS
  47 #include "options.h"
  48 #undef DEFINE_OPTIONS
  49 #include "nodes.h"      /* for other header files */
  50 #include "eval.h"
  51 #include "jobs.h"
  52 #include "input.h"
  53 #include "output.h"
  54 #include "trap.h"
  55 #include "var.h"
  56 #include "memalloc.h"
  57 #include "error.h"
  58 #include "mystring.h"
  59 #include "builtins.h"
  60 #ifndef NO_HISTORY
  61 #include "myhistedit.h"
  62 #endif
  63
  64 char *arg0;                     /* value of $0 */
  65 struct shparam shellparam;      /* current positional parameters */
  66 char **argptr;                  /* argument list for builtin commands */
  67 char *shoptarg;                 /* set by nextopt (like getopt) */
  68 char *nextopt_optptr;           /* used by nextopt */
  69
  70 char *minusc;                   /* argument to -c option */
  71
  72
  73 static void options(int);
  74 static void minus_o(char *, int);
  75 static void setoption(int, int);
  76 static int getopts(char *, char *, char **, char ***, char **);
  77
  78
  79 /*
  80  * Process the shell command line arguments.
  81  */
  82
  83 void
  84 procargs(int argc, char **argv)
  85 {
  86         int i;
  87         char *scriptname;
  88
  89         argptr = argv;
  90         if (argc > 0)
  91                 argptr++;
  92         for (i = 0; i < NOPTS; i++)
  93                 optlist[i].val = 2;
  94         privileged = (getuid() != geteuid() || getgid() != getegid());
  95         options(1);
  96         if (*argptr == NULL && minusc == NULL)
  97                 sflag = 1;
  98         if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
  99                 iflag = 1;
 100                 if (Eflag == 2)
 101                         Eflag = 1;
 102         }
 103         if (mflag == 2)
 104                 mflag = iflag;
 105         for (i = 0; i < NOPTS; i++)
 106                 if (optlist[i].val == 2)
 107                         optlist[i].val = 0;
 108         arg0 = argv[0];
 109         if (sflag == 0 && minusc == NULL) {
 110                 scriptname = *argptr++;
 111                 setinputfile(scriptname, 0);
 112                 commandname = arg0 = scriptname;
 113         }
 114         /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
 115         if (argptr && minusc && *argptr)
 116                 arg0 = *argptr++;
 117
 118         shellparam.p = argptr;
 119         shellparam.reset = 1;
 120         /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
 121         while (*argptr) {
 122                 shellparam.nparam++;
 123                 argptr++;
 124         }
 125         optschanged();
 126 }
 127
 128
 129 void
 130 optschanged(void)
 131 {
 132         setinteractive(iflag);
 133 #ifndef NO_HISTORY
 134         histedit();
 135 #endif
 136         setjobctl(mflag);
 137 }
 138
 139 /*
 140  * Process shell options.  The global variable argptr contains a pointer
 141  * to the argument list; we advance it past the options.
 142  */
 143
 144 static void
 145 options(int cmdline)
 146 {
 147         char *kp, *p;
 148         int val;
 149         int c;
 150
 151         if (cmdline)
 152                 minusc = NULL;
 153         while ((p = *argptr) != NULL) {
 154                 argptr++;
 155                 if ((c = *p++) == '-') {
 156                         val = 1;
 157                         /* A "-" or  "--" terminates options */
 158                         if (p[0] == '\0')
 159                                 goto end_options1;
 160                         if (p[0] == '-' && p[1] == '\0')
 161                                 goto end_options2;
 162                         /**
 163                          * For the benefit of `#!' lines in shell scripts,
 164                          * treat a string of '-- *#.*' the same as '--'.
 165                          * This is needed so that a script starting with:
 166                          *      #!/bin/sh -- # -*- perl -*-
 167                          * will continue to work after a change is made to
 168                          * kern/imgact_shell.c to NOT token-ize the options
 169                          * specified on a '#!' line.  A bit of a kludge,
 170                          * but that trick is recommended in documentation
 171                          * for some scripting languages, and we might as
 172                          * well continue to support it.
 173                          */
 174                         if (p[0] == '-') {
 175                                 kp = p + 1;
 176                                 while (*kp == ' ' || *kp == '\t')
 177                                         kp++;
 178                                 if (*kp == '#' || *kp == '\0')
 179                                         goto end_options2;
 180                         }
 181                 } else if (c == '+') {
 182                         val = 0;
 183                 } else {
 184                         argptr--;
 185                         break;
 186                 }
 187                 while ((c = *p++) != '\0') {
 188                         if (c == 'c' && cmdline) {
 189                                 char *q;
 190 #ifdef NOHACK   /* removing this code allows sh -ce 'foo' for compat */
 191                                 if (*p == '\0')
 192 #endif
 193                                         q = *argptr++;
 194                                 if (q == NULL || minusc != NULL)
 195                                         error("Bad -c option");
 196                                 minusc = q;
 197 #ifdef NOHACK
 198                                 break;
 199 #endif
 200                         } else if (c == 'o') {
 201                                 minus_o(*argptr, val);
 202                                 if (*argptr)
 203                                         argptr++;
 204                         } else
 205                                 setoption(c, val);
 206                 }
 207         }
 208         return;
 209
 210         /* When processing `set', a single "-" means turn off -x and -v */
 211 end_options1:
 212         if (!cmdline) {
 213                 xflag = vflag = 0;
 214                 return;
 215         }
 216
 217         /*
 218          * When processing `set', a "--" means the remaining arguments
 219          * replace the positional parameters in the active shell.  If
 220          * there are no remaining options, then all the positional
 221          * parameters are cleared (equivalent to doing ``shift $#'').
 222          */
 223 end_options2:
 224         if (!cmdline) {
 225                 if (*argptr == NULL)
 226                         setparam(argptr);
 227                 return;
 228         }
 229
 230         /*
 231          * At this point we are processing options given to 'sh' on a command
 232          * line.  If an end-of-options marker ("-" or "--") is followed by an
 233          * arg of "#", then skip over all remaining arguments.  Some scripting
 234          * languages (e.g.: perl) document that /bin/sh will implement this
 235          * behavior, and they recommend that users take advantage of it to
 236          * solve certain issues that can come up when writing a perl script.
 237          * Yes, this feature is in /bin/sh to help users write perl scripts.
 238          */
 239         p = *argptr;
 240         if (p != NULL && p[0] == '#' && p[1] == '\0') {
 241                 while (*argptr != NULL)
 242                         argptr++;
 243                 /* We need to keep the final argument */
 244                 argptr--;
 245         }
 246 }
 247
 248 static void
 249 minus_o(char *name, int val)
 250 {
 251         int i;
 252
 253         if (name == NULL) {
 254                 if (val) {
 255                         /* "Pretty" output. */
 256                         out1str("Current option settings\n");
 257                         for (i = 0; i < NOPTS; i++)
 258                                 out1fmt("%-16s%s\n", optlist[i].name,
 259                                         optlist[i].val ? "on" : "off");
 260                 } else {
 261                         /* Output suitable for re-input to shell. */
 262                         for (i = 0; i < NOPTS; i++)
 263                                 out1fmt("%s %co %s%s",
 264                                     i % 6 == 0 ? "set" : "",
 265                                     optlist[i].val ? '-' : '+',
 266                                     optlist[i].name,
 267                                     i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
 268                 }
 269         } else {
 270                 for (i = 0; i < NOPTS; i++)
 271                         if (equal(name, optlist[i].name)) {
 272                                 setoption(optlist[i].letter, val);
 273                                 return;
 274                         }
 275                 error("Illegal option -o %s", name);
 276         }
 277 }
 278
 279
 280 static void
 281 setoption(int flag, int val)
 282 {
 283         int i;
 284
 285         if (flag == 'p' && !val && privileged) {
 286                 if (setgid(getgid()) == -1)
 287                         error("setgid");
 288                 if (setuid(getuid()) == -1)
 289                         error("setuid");
 290         }
 291         for (i = 0; i < NOPTS; i++)
 292                 if (optlist[i].letter == flag) {
 293                         optlist[i].val = val;
 294                         if (val) {
 295                                 /* #%$ hack for ksh semantics */
 296                                 if (flag == 'V')
 297                                         Eflag = 0;
 298                                 else if (flag == 'E')
 299                                         Vflag = 0;
 300                         }
 301                         return;
 302                 }
 303         error("Illegal option -%c", flag);
 304 }
 305
 306
 307 /*
 308  * Set the shell parameters.
 309  */
 310
 311 void
 312 setparam(char **argv)
 313 {
 314         char **newparam;
 315         char **ap;
 316         int nparam;
 317
 318         for (nparam = 0 ; argv[nparam] ; nparam++);
 319         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 320         while (*argv) {
 321                 *ap++ = savestr(*argv++);
 322         }
 323         *ap = NULL;
 324         freeparam(&shellparam);
 325         shellparam.malloc = 1;
 326         shellparam.nparam = nparam;
 327         shellparam.p = newparam;
 328         shellparam.optp = NULL;
 329         shellparam.reset = 1;
 330         shellparam.optnext = NULL;
 331 }
 332
 333
 334 /*
 335  * Free the list of positional parameters.
 336  */
 337
 338 void
 339 freeparam(struct shparam *param)
 340 {
 341         char **ap;
 342
 343         if (param->malloc) {
 344                 for (ap = param->p ; *ap ; ap++)
 345                         ckfree(*ap);
 346                 ckfree(param->p);
 347         }
 348         if (param->optp) {
 349                 for (ap = param->optp ; *ap ; ap++)
 350                         ckfree(*ap);
 351                 ckfree(param->optp);
 352         }
 353 }
 354
 355
 356
 357 /*
 358  * The shift builtin command.
 359  */
 360
 361 int
 362 shiftcmd(int argc, char **argv)
 363 {
 364         int n;
 365         char **ap1, **ap2;
 366
 367         n = 1;
 368         if (argc > 1)
 369                 n = number(argv[1]);
 370         if (n > shellparam.nparam)
 371                 return 1;
 372         INTOFF;
 373         shellparam.nparam -= n;
 374         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 375                 if (shellparam.malloc)
 376                         ckfree(*ap1);
 377         }
 378         ap2 = shellparam.p;
 379         while ((*ap2++ = *ap1++) != NULL);
 380         shellparam.reset = 1;
 381         INTON;
 382         return 0;
 383 }
 384
 385
 386
 387 /*
 388  * The set command builtin.
 389  */
 390
 391 int
 392 setcmd(int argc, char **argv)
 393 {
 394         if (argc == 1)
 395                 return showvarscmd(argc, argv);
 396         INTOFF;
 397         options(0);
 398         optschanged();
 399         if (*argptr != NULL) {
 400                 setparam(argptr);
 401         }
 402         INTON;
 403         return 0;
 404 }
 405
 406
 407 void
 408 getoptsreset(const char *value)
 409 {
 410         while (*value == '0')
 411                 value++;
 412         if (strcmp(value, "1") == 0)
 413                 shellparam.reset = 1;
 414 }
 415
 416 /*
 417  * The getopts builtin.  Shellparam.optnext points to the next argument
 418  * to be processed.  Shellparam.optptr points to the next character to
 419  * be processed in the current argument.  If shellparam.optnext is NULL,
 420  * then it's the first time getopts has been called.
 421  */
 422
 423 int
 424 getoptscmd(int argc, char **argv)
 425 {
 426         char **optbase = NULL, **ap;
 427         int i;
 428
 429         if (argc < 3)
 430                 error("usage: getopts optstring var [arg]");
 431
 432         if (shellparam.reset == 1) {
 433                 INTOFF;
 434                 if (shellparam.optp) {
 435                         for (ap = shellparam.optp ; *ap ; ap++)
 436                                 ckfree(*ap);
 437                         ckfree(shellparam.optp);
 438                         shellparam.optp = NULL;
 439                 }
 440                 if (argc > 3) {
 441                         shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
 442                         memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
 443                         for (i = 0; i < argc - 3; i++)
 444                                 shellparam.optp[i] = savestr(argv[i + 3]);
 445                 }
 446                 INTON;
 447                 optbase = argc == 3 ? shellparam.p : shellparam.optp;
 448                 shellparam.optnext = optbase;
 449                 shellparam.optptr = NULL;
 450                 shellparam.reset = 0;
 451         } else
 452                 optbase = shellparam.optp ? shellparam.optp : shellparam.p;
 453
 454         return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
 455                        &shellparam.optptr);
 456 }
 457
 458 static int
 459 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
 460     char **optptr)
 461 {
 462         char *p, *q;
 463         char c = '?';
 464         int done = 0;
 465         int ind = 0;
 466         int err = 0;
 467         char s[10];
 468         const char *newoptarg = NULL;
 469
 470         if ((p = *optptr) == NULL || *p == '\0') {
 471                 /* Current word is done, advance */
 472                 if (*optnext == NULL)
 473                         return 1;
 474                 p = **optnext;
 475                 if (p == NULL || *p != '-' || *++p == '\0') {
 476 atend:
 477                         ind = *optnext - optfirst + 1;
 478                         *optnext = NULL;
 479                         p = NULL;
 480                         done = 1;
 481                         goto out;
 482                 }
 483                 (*optnext)++;
 484                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 485                         goto atend;
 486         }
 487
 488         c = *p++;
 489         for (q = optstr; *q != c; ) {
 490                 if (*q == '\0') {
 491                         if (optstr[0] == ':') {
 492                                 s[0] = c;
 493                                 s[1] = '\0';
 494                                 newoptarg = s;
 495                         }
 496                         else
 497                                 out2fmt_flush("Illegal option -%c\n", c);
 498                         c = '?';
 499                         goto out;
 500                 }
 501                 if (*++q == ':')
 502                         q++;
 503         }
 504
 505         if (*++q == ':') {
 506                 if (*p == '\0' && (p = **optnext) == NULL) {
 507                         if (optstr[0] == ':') {
 508                                 s[0] = c;
 509                                 s[1] = '\0';
 510                                 newoptarg = s;
 511                                 c = ':';
 512                         }
 513                         else {
 514                                 out2fmt_flush("No arg for -%c option\n", c);
 515                                 c = '?';
 516                         }
 517                         goto out;
 518                 }
 519
 520                 if (p == **optnext)
 521                         (*optnext)++;
 522                 newoptarg = p;
 523                 p = NULL;
 524         }
 525
 526 out:
 527         if (*optnext != NULL)
 528                 ind = *optnext - optfirst + 1;
 529         *optptr = p;
 530         if (newoptarg != NULL)
 531                 err |= setvarsafe("OPTARG", newoptarg, 0);
 532         else {
 533                 INTOFF;
 534                 err |= unsetvar("OPTARG");
 535                 INTON;
 536         }
 537         fmtstr(s, sizeof(s), "%d", ind);
 538         err |= setvarsafe("OPTIND", s, VNOFUNC);
 539         s[0] = c;
 540         s[1] = '\0';
 541         err |= setvarsafe(optvar, s, 0);
 542         if (err) {
 543                 *optnext = NULL;
 544                 *optptr = NULL;
 545                 flushall();
 546                 exraise(EXERROR);
 547         }
 548         return done;
 549 }
 550
 551 /*
 552  * Standard option processing (a la getopt) for builtin routines.  The
 553  * only argument that is passed to nextopt is the option string; the
 554  * other arguments are unnecessary.  It return the character, or '\0' on
 555  * end of input.
 556  */
 557
 558 int
 559 nextopt(const char *optstring)
 560 {
 561         char *p;
 562         const char *q;
 563         char c;
 564
 565         if ((p = nextopt_optptr) == NULL || *p == '\0') {
 566                 p = *argptr;
 567                 if (p == NULL || *p != '-' || *++p == '\0')
 568                         return '\0';
 569                 argptr++;
 570                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 571                         return '\0';
 572         }
 573         c = *p++;
 574         for (q = optstring ; *q != c ; ) {
 575                 if (*q == '\0')
 576                         error("Illegal option -%c", c);
 577                 if (*++q == ':')
 578                         q++;
 579         }
 580         if (*++q == ':') {
 581                 if (*p == '\0' && (p = *argptr++) == NULL)
 582                         error("No arg for -%c option", c);
 583                 shoptarg = p;
 584                 p = NULL;
 585         }
 586         nextopt_optptr = p;
 587         return c;
 588 }