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. 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  * @(#)options.c        8.2 (Berkeley) 5/4/95
  37  * $FreeBSD: src/bin/sh/options.c,v 1.15.2.2 2002/07/19 04:38:52 tjr Exp $
  38  * $DragonFly: src/bin/sh/options.c,v 1.6 2007/01/07 01:14:53 pavalos Exp $
  39  */
  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 #ifndef NO_HISTORY
  60 #include "myhistedit.h"
  61 #endif
  62
  63 char *arg0;                     /* value of $0 */
  64 struct shparam shellparam;      /* current positional parameters */
  65 char **argptr;                  /* argument list for builtin commands */
  66 const char *shoptarg;           /* set by nextopt (like getopt) */
  67 const char *optptr;             /* used by nextopt */
  68
  69 char *minusc;                   /* argument to -c option */
  70
  71
  72 STATIC void options(int);
  73 STATIC void minus_o(char *, int);
  74 STATIC void setoption(int, int);
  75 STATIC int getopts(char *, char *, char **, char ***, char **);
  76
  77
  78 /*
  79  * Process the shell command line arguments.
  80  */
  81
  82 void
  83 procargs(int argc, char **argv)
  84 {
  85         int i;
  86
  87         argptr = argv;
  88         if (argc > 0)
  89                 argptr++;
  90         for (i = 0; i < NOPTS; i++)
  91                 optlist[i].val = 2;
  92         privileged = (getuid() != geteuid() || getgid() != getegid());
  93         options(1);
  94         if (*argptr == NULL && minusc == NULL)
  95                 sflag = 1;
  96         if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
  97                 iflag = 1;
  98         if (mflag == 2)
  99                 mflag = iflag;
 100         for (i = 0; i < NOPTS; i++)
 101                 if (optlist[i].val == 2)
 102                         optlist[i].val = 0;
 103         arg0 = argv[0];
 104         if (sflag == 0 && minusc == NULL) {
 105                 commandname = arg0 = *argptr++;
 106                 setinputfile(commandname, 0);
 107         }
 108         /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
 109         if (argptr && minusc && *argptr)
 110                 arg0 = *argptr++;
 111
 112         shellparam.p = argptr;
 113         shellparam.reset = 1;
 114         /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
 115         while (*argptr) {
 116                 shellparam.nparam++;
 117                 argptr++;
 118         }
 119         optschanged();
 120 }
 121
 122
 123 void
 124 optschanged(void)
 125 {
 126         setinteractive(iflag);
 127 #ifndef NO_HISTORY
 128         histedit();
 129 #endif
 130         setjobctl(mflag);
 131 }
 132
 133 /*
 134  * Process shell options.  The global variable argptr contains a pointer
 135  * to the argument list; we advance it past the options.
 136  */
 137
 138 STATIC void
 139 options(int cmdline)
 140 {
 141         char *p;
 142         int val;
 143         int c;
 144
 145         if (cmdline)
 146                 minusc = NULL;
 147         while ((p = *argptr) != NULL) {
 148                 argptr++;
 149                 if ((c = *p++) == '-') {
 150                         val = 1;
 151                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
 152                                 if (!cmdline) {
 153                                         /* "-" means turn off -x and -v */
 154                                         if (p[0] == '\0')
 155                                                 xflag = vflag = 0;
 156                                         /* "--" means reset params */
 157                                         else if (*argptr == NULL)
 158                                                 setparam(argptr);
 159                                 }
 160                                 break;    /* "-" or  "--" terminates options */
 161                         }
 162                 } else if (c == '+') {
 163                         val = 0;
 164                 } else {
 165                         argptr--;
 166                         break;
 167                 }
 168                 while ((c = *p++) != '\0') {
 169                         if (c == 'c' && cmdline) {
 170                                 char *q;
 171 #ifdef NOHACK   /* removing this code allows sh -ce 'foo' for compat */
 172                                 if (*p == '\0')
 173 #endif
 174                                         q = *argptr++;
 175                                 if (q == NULL || minusc != NULL)
 176                                         error("Bad -c option");
 177                                 minusc = q;
 178 #ifdef NOHACK
 179                                 break;
 180 #endif
 181                         } else if (c == 'o') {
 182                                 minus_o(*argptr, val);
 183                                 if (*argptr)
 184                                         argptr++;
 185                         } else {
 186                                 if (c == 'p' && !val && privileged) {
 187                                         setuid(getuid());
 188                                         setgid(getgid());
 189                                 }
 190                                 setoption(c, val);
 191                         }
 192                 }
 193         }
 194 }
 195
 196 STATIC void
 197 minus_o(char *name, int val)
 198 {
 199         int doneset, i;
 200
 201         if (name == NULL) {
 202                 if (val) {
 203                         /* "Pretty" output. */
 204                         out1str("Current option settings\n");
 205                         for (i = 0; i < NOPTS; i++)
 206                                 out1fmt("%-16s%s\n", optlist[i].name,
 207                                         optlist[i].val ? "on" : "off");
 208                 } else {
 209                         /* Output suitable for re-input to shell. */
 210                         for (doneset = i = 0; i < NOPTS; i++)
 211                                 if (optlist[i].val) {
 212                                         if (!doneset) {
 213                                                 out1str("set");
 214                                                 doneset = 1;
 215                                         }
 216                                         out1fmt(" -o %s", optlist[i].name);
 217                                 }
 218                         if (doneset)
 219                                 out1c('\n');
 220                 }
 221         } else {
 222                 for (i = 0; i < NOPTS; i++)
 223                         if (equal(name, optlist[i].name)) {
 224                                 if (!val && privileged && equal(name, "privileged")) {
 225                                         setuid(getuid());
 226                                         setgid(getgid());
 227                                 }
 228                                 setoption(optlist[i].letter, val);
 229                                 return;
 230                         }
 231                 error("Illegal option -o %s", name);
 232         }
 233 }
 234
 235
 236 STATIC void
 237 setoption(int flag, int val)
 238 {
 239         int i;
 240
 241         for (i = 0; i < NOPTS; i++)
 242                 if (optlist[i].letter == flag) {
 243                         optlist[i].val = val;
 244                         if (val) {
 245                                 /* #%$ hack for ksh semantics */
 246                                 if (flag == 'V')
 247                                         Eflag = 0;
 248                                 else if (flag == 'E')
 249                                         Vflag = 0;
 250                         }
 251                         return;
 252                 }
 253         error("Illegal option -%c", flag);
 254 }
 255
 256
 257
 258 #ifdef mkinit
 259 INCLUDE "options.h"
 260
 261 SHELLPROC {
 262         int i;
 263
 264         for (i = 0; i < NOPTS; i++)
 265                 optlist[i].val = 0;
 266         optschanged();
 267
 268 }
 269 #endif
 270
 271
 272 /*
 273  * Set the shell parameters.
 274  */
 275
 276 void
 277 setparam(char **argv)
 278 {
 279         char **newparam;
 280         char **ap;
 281         int nparam;
 282
 283         for (nparam = 0 ; argv[nparam] ; nparam++);
 284         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 285         while (*argv) {
 286                 *ap++ = savestr(*argv++);
 287         }
 288         *ap = NULL;
 289         freeparam(&shellparam);
 290         shellparam.malloc = 1;
 291         shellparam.nparam = nparam;
 292         shellparam.p = newparam;
 293         shellparam.optnext = NULL;
 294 }
 295
 296
 297 /*
 298  * Free the list of positional parameters.
 299  */
 300
 301 void
 302 freeparam(volatile struct shparam *param)
 303 {
 304         char **ap;
 305
 306         if (param->malloc) {
 307                 for (ap = param->p ; *ap ; ap++)
 308                         ckfree(*ap);
 309                 ckfree(param->p);
 310         }
 311 }
 312
 313
 314
 315 /*
 316  * The shift builtin command.
 317  */
 318
 319 int
 320 shiftcmd(int argc, char **argv)
 321 {
 322         int n;
 323         char **ap1, **ap2;
 324
 325         n = 1;
 326         if (argc > 1)
 327                 n = number(argv[1]);
 328         if (n > shellparam.nparam)
 329                 return 1;
 330         INTOFF;
 331         shellparam.nparam -= n;
 332         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 333                 if (shellparam.malloc)
 334                         ckfree(*ap1);
 335         }
 336         ap2 = shellparam.p;
 337         while ((*ap2++ = *ap1++) != NULL);
 338         shellparam.optnext = NULL;
 339         INTON;
 340         return 0;
 341 }
 342
 343
 344
 345 /*
 346  * The set command builtin.
 347  */
 348
 349 int
 350 setcmd(int argc, char **argv)
 351 {
 352         if (argc == 1)
 353                 return showvarscmd(argc, argv);
 354         INTOFF;
 355         options(0);
 356         optschanged();
 357         if (*argptr != NULL) {
 358                 setparam(argptr);
 359         }
 360         INTON;
 361         return 0;
 362 }
 363
 364
 365 void
 366 getoptsreset(const char *value)
 367 {
 368         if (number(value) == 1) {
 369                 shellparam.optnext = NULL;
 370                 shellparam.reset = 1;
 371         }
 372 }
 373
 374 /*
 375  * The getopts builtin.  Shellparam.optnext points to the next argument
 376  * to be processed.  Shellparam.optptr points to the next character to
 377  * be processed in the current argument.  If shellparam.optnext is NULL,
 378  * then it's the first time getopts has been called.
 379  */
 380
 381 int
 382 getoptscmd(int argc, char **argv)
 383 {
 384         char **optbase = NULL;
 385
 386         if (argc < 3)
 387                 error("usage: getopts optstring var [arg]");
 388         else if (argc == 3)
 389                 optbase = shellparam.p;
 390         else
 391                 optbase = &argv[3];
 392
 393         if (shellparam.reset == 1) {
 394                 shellparam.optnext = optbase;
 395                 shellparam.optptr = NULL;
 396                 shellparam.reset = 0;
 397         }
 398
 399         return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
 400                        &shellparam.optptr);
 401 }
 402
 403 STATIC int
 404 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
 405     char **optp)
 406 {
 407         char *p, *q;
 408         char c = '?';
 409         int done = 0;
 410         int ind = 0;
 411         int err = 0;
 412         char s[10];
 413
 414         if ((p = *optp) == NULL || *p == '\0') {
 415                 /* Current word is done, advance */
 416                 if (*optnext == NULL)
 417                         return 1;
 418                 p = **optnext;
 419                 if (p == NULL || *p != '-' || *++p == '\0') {
 420 atend:
 421                         ind = *optnext - optfirst + 1;
 422                         *optnext = NULL;
 423                         p = NULL;
 424                         done = 1;
 425                         goto out;
 426                 }
 427                 (*optnext)++;
 428                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 429                         goto atend;
 430         }
 431
 432         c = *p++;
 433         for (q = optstr; *q != c; ) {
 434                 if (*q == '\0') {
 435                         if (optstr[0] == ':') {
 436                                 s[0] = c;
 437                                 s[1] = '\0';
 438                                 err |= setvarsafe("OPTARG", s, 0);
 439                         }
 440                         else {
 441                                 out1fmt("Illegal option -%c\n", c);
 442                                 unsetvar("OPTARG");
 443                         }
 444                         c = '?';
 445                         goto bad;
 446                 }
 447                 if (*++q == ':')
 448                         q++;
 449         }
 450
 451         if (*++q == ':') {
 452                 if (*p == '\0' && (p = **optnext) == NULL) {
 453                         if (optstr[0] == ':') {
 454                                 s[0] = c;
 455                                 s[1] = '\0';
 456                                 err |= setvarsafe("OPTARG", s, 0);
 457                                 c = ':';
 458                         }
 459                         else {
 460                                 out1fmt("No arg for -%c option\n", c);
 461                                 unsetvar("OPTARG");
 462                                 c = '?';
 463                         }
 464                         goto bad;
 465                 }
 466
 467                 if (p == **optnext)
 468                         (*optnext)++;
 469                 setvarsafe("OPTARG", p, 0);
 470                 p = NULL;
 471         }
 472         else
 473                 setvarsafe("OPTARG", "", 0);
 474         ind = *optnext - optfirst + 1;
 475         goto out;
 476
 477 bad:
 478         ind = 1;
 479         *optnext = NULL;
 480         p = NULL;
 481 out:
 482         *optp = p;
 483         fmtstr(s, sizeof(s), "%d", ind);
 484         err |= setvarsafe("OPTIND", s, VNOFUNC);
 485         s[0] = c;
 486         s[1] = '\0';
 487         err |= setvarsafe(optvar, s, 0);
 488         if (err) {
 489                 *optnext = NULL;
 490                 *optp = NULL;
 491                 flushall();
 492                 exraise(EXERROR);
 493         }
 494         return done;
 495 }
 496
 497 /*
 498  * XXX - should get rid of.  have all builtins use getopt(3).  the
 499  * library getopt must have the BSD extension static variable "optreset"
 500  * otherwise it can't be used within the shell safely.
 501  *
 502  * Standard option processing (a la getopt) for builtin routines.  The
 503  * only argument that is passed to nextopt is the option string; the
 504  * other arguments are unnecessary.  It return the character, or '\0' on
 505  * end of input.
 506  */
 507
 508 int
 509 nextopt(const char *optstring)
 510 {
 511         const char *p, *q;
 512         char c;
 513
 514         if ((p = optptr) == NULL || *p == '\0') {
 515                 p = *argptr;
 516                 if (p == NULL || *p != '-' || *++p == '\0')
 517                         return '\0';
 518                 argptr++;
 519                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 520                         return '\0';
 521         }
 522         c = *p++;
 523         for (q = optstring ; *q != c ; ) {
 524                 if (*q == '\0')
 525                         error("Illegal option -%c", c);
 526                 if (*++q == ':')
 527                         q++;
 528         }
 529         if (*++q == ':') {
 530                 if (*p == '\0' && (p = *argptr++) == NULL)
 531                         error("No arg for -%c option", c);
 532                 shoptarg = p;
 533                 p = NULL;
 534         }
 535         optptr = p;
 536         return c;
 537 }