commands/ash/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  * 4. 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 /*
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD: src/bin/sh/options.c,v 1.21 2004/04/06 20:06:51 markm Exp $");
  41 */
  42
  43 #include <signal.h>
  44 #include <unistd.h>
  45 #include <stdlib.h>
  46
  47 #include "shell.h"
  48 #define DEFINE_OPTIONS
  49 #include "options.h"
  50 #undef DEFINE_OPTIONS
  51 #include "nodes.h"      /* for other header files */
  52 #include "eval.h"
  53 #include "jobs.h"
  54 #include "input.h"
  55 #include "output.h"
  56 #include "trap.h"
  57 #include "var.h"
  58 #include "memalloc.h"
  59 #include "error.h"
  60 #include "mystring.h"
  61 #include "builtins.h"
  62 #if !defined(NO_HISTORY)
  63 #include "myhistedit.h"
  64 #endif
  65
  66 char *arg0;                     /* value of $0 */
  67 struct shparam shellparam;      /* current positional parameters */
  68 char **argptr;                  /* argument list for builtin commands */
  69 char *shoptarg;                 /* set by nextopt (like getopt) */
  70 char *optptr;                   /* used by nextopt */
  71 int editable;                   /* isatty(0) && isatty(1) */
  72
  73 char *minusc;                   /* argument to -c option */
  74
  75
  76 STATIC void options(int);
  77 STATIC void minus_o(char *, int);
  78 STATIC void setoption(int, int);
  79 STATIC int getopts(char *, char *, char **, char ***, char **);
  80
  81
  82 /*
  83  * Process the shell command line arguments.
  84  */
  85
  86 void
  87 procargs(int argc, char **argv)
  88 {
  89         int i;
  90
  91         argptr = argv;
  92         if (argc > 0)
  93                 argptr++;
  94         for (i = 0; i < NOPTS; i++)
  95                 optlist[i].val = 2;
  96         privileged = (getuid() != geteuid() || getgid() != getegid());
  97         options(1);
  98         if (*argptr == NULL && minusc == NULL)
  99                 sflag = 1;
 100         editable = (isatty(0) && isatty(1));
 101         if (iflag == 2 && sflag == 1 && editable)
 102                 iflag = 1;
 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                 commandname = arg0 = *argptr++;
 111                 setinputfile(commandname, 0);
 112         }
 113         /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
 114         if (argptr && minusc && *argptr)
 115                 arg0 = *argptr++;
 116
 117         shellparam.p = argptr;
 118         shellparam.reset = 1;
 119         /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
 120         while (*argptr) {
 121                 shellparam.nparam++;
 122                 argptr++;
 123         }
 124         optschanged();
 125 }
 126
 127
 128 void
 129 optschanged(void)
 130 {
 131         setinteractive(iflag);
 132 #if !defined(NO_HISTORY)
 133         histedit();
 134 #endif
 135         setjobctl(mflag);
 136 }
 137
 138 /*
 139  * Process shell options.  The global variable argptr contains a pointer
 140  * to the argument list; we advance it past the options.
 141  */
 142
 143 STATIC void
 144 options(int cmdline)
 145 {
 146         char *p;
 147         int val;
 148         int c;
 149
 150         if (cmdline)
 151                 minusc = NULL;
 152         while ((p = *argptr) != NULL) {
 153                 argptr++;
 154                 if ((c = *p++) == '-') {
 155                         val = 1;
 156                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
 157                                 if (!cmdline) {
 158                                         /* "-" means turn off -x and -v */
 159                                         if (p[0] == '\0')
 160                                                 xflag = vflag = 0;
 161                                         /* "--" means reset params */
 162                                         else if (*argptr == NULL)
 163                                                 setparam(argptr);
 164                                 }
 165                                 break;    /* "-" or  "--" terminates options */
 166                         }
 167                 } else if (c == '+') {
 168                         val = 0;
 169                 } else {
 170                         argptr--;
 171                         break;
 172                 }
 173                 while ((c = *p++) != '\0') {
 174                         if (c == 'c' && cmdline) {
 175                                 char *q;
 176 #ifdef NOHACK   /* removing this code allows sh -ce 'foo' for compat */
 177                                 if (*p == '\0')
 178 #endif
 179                                         q = *argptr++;
 180                                 if (q == NULL || minusc != NULL)
 181                                         error("Bad -c option");
 182                                 minusc = q;
 183 #ifdef NOHACK
 184                                 break;
 185 #endif
 186                         } else if (c == 'o') {
 187                                 minus_o(*argptr, val);
 188                                 if (*argptr)
 189                                         argptr++;
 190                         } else {
 191                                 if (c == 'p' && !val && privileged) {
 192                                         (void) setuid(getuid());
 193                                         (void) setgid(getgid());
 194                                 }
 195                                 setoption(c, val);
 196                         }
 197                 }
 198         }
 199 }
 200
 201 STATIC void
 202 minus_o(char *name, int val)
 203 {
 204         int doneset, i;
 205
 206         if (name == NULL) {
 207                 if (val) {
 208                         /* "Pretty" output. */
 209                         out1str("Current option settings\n");
 210                         for (i = 0; i < NOPTS; i++)
 211                                 out1fmt("%-16s%s\n", optlist[i].name,
 212                                         optlist[i].val ? "on" : "off");
 213                 } else {
 214                         /* Output suitable for re-input to shell. */
 215                         for (doneset = i = 0; i < NOPTS; i++)
 216                                 if (optlist[i].val) {
 217                                         if (!doneset) {
 218                                                 out1str("set");
 219                                                 doneset = 1;
 220                                         }
 221                                         out1fmt(" -o %s", optlist[i].name);
 222                                 }
 223                         if (doneset)
 224                                 out1c('\n');
 225                 }
 226         } else {
 227                 for (i = 0; i < NOPTS; i++)
 228                         if (equal(name, optlist[i].name)) {
 229                                 if (!val && privileged && equal(name, "privileged")) {
 230                                         (void) setuid(getuid());
 231                                         (void) setgid(getgid());
 232                                 }
 233                                 setoption(optlist[i].letter, val);
 234                                 return;
 235                         }
 236                 error("Illegal option -o %s", name);
 237         }
 238 }
 239
 240
 241 STATIC void
 242 setoption(int flag, int val)
 243 {
 244         int i;
 245
 246         for (i = 0; i < NOPTS; i++)
 247                 if (optlist[i].letter == flag) {
 248                         optlist[i].val = val;
 249                         if (val) {
 250                                 /* #%$ hack for ksh semantics */
 251                                 if (flag == 'V')
 252                                         Eflag = 0;
 253                                 else if (flag == 'E')
 254                                         Vflag = 0;
 255                         }
 256                         return;
 257                 }
 258         error("Illegal option -%c", flag);
 259 }
 260
 261
 262
 263 #ifdef mkinit
 264 INCLUDE "options.h"
 265
 266 SHELLPROC {
 267         int i;
 268
 269         for (i = 0; i < NOPTS; i++)
 270                 optlist[i].val = 0;
 271         optschanged();
 272
 273 }
 274 #endif
 275
 276
 277 /*
 278  * Set the shell parameters.
 279  */
 280
 281 void
 282 setparam(char **argv)
 283 {
 284         char **newparam;
 285         char **ap;
 286         int nparam;
 287
 288         for (nparam = 0 ; argv[nparam] ; nparam++);
 289         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 290         while (*argv) {
 291                 *ap++ = savestr(*argv++);
 292         }
 293         *ap = NULL;
 294         freeparam(&shellparam);
 295         shellparam.malloc = 1;
 296         shellparam.nparam = nparam;
 297         shellparam.p = newparam;
 298         shellparam.optnext = NULL;
 299 }
 300
 301
 302 /*
 303  * Free the list of positional parameters.
 304  */
 305
 306 void
 307 freeparam(struct shparam *param)
 308 {
 309         char **ap;
 310
 311         if (param->malloc) {
 312                 for (ap = param->p ; *ap ; ap++)
 313                         ckfree(*ap);
 314                 ckfree(param->p);
 315         }
 316 }
 317
 318
 319
 320 /*
 321  * The shift builtin command.
 322  */
 323
 324 int
 325 shiftcmd(int argc, char **argv)
 326 {
 327         int n;
 328         char **ap1, **ap2;
 329
 330         n = 1;
 331         if (argc > 1)
 332                 n = number(argv[1]);
 333         if (n > shellparam.nparam)
 334                 error("can't shift that many");
 335         INTOFF;
 336         shellparam.nparam -= n;
 337         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 338                 if (shellparam.malloc)
 339                         ckfree(*ap1);
 340         }
 341         ap2 = shellparam.p;
 342         while ((*ap2++ = *ap1++) != NULL);
 343         shellparam.optnext = NULL;
 344         INTON;
 345         return 0;
 346 }
 347
 348
 349
 350 /*
 351  * The set command builtin.
 352  */
 353
 354 int
 355 setcmd(int argc, char **argv)
 356 {
 357         if (argc == 1)
 358                 return showvarscmd(argc, argv);
 359         INTOFF;
 360         options(0);
 361         optschanged();
 362         if (*argptr != NULL) {
 363                 setparam(argptr);
 364         }
 365         INTON;
 366         return 0;
 367 }
 368
 369
 370 void
 371 getoptsreset(const char *value)
 372 {
 373         if (number(value) == 1) {
 374                 shellparam.optnext = NULL;
 375                 shellparam.reset = 1;
 376         }
 377 }
 378
 379 /*
 380  * The getopts builtin.  Shellparam.optnext points to the next argument
 381  * to be processed.  Shellparam.optptr points to the next character to
 382  * be processed in the current argument.  If shellparam.optnext is NULL,
 383  * then it's the first time getopts has been called.
 384  */
 385
 386 int
 387 getoptscmd(int argc, char **argv)
 388 {
 389         char **optbase = NULL;
 390
 391         if (argc < 3)
 392                 error("usage: getopts optstring var [arg]");
 393         else if (argc == 3)
 394                 optbase = shellparam.p;
 395         else
 396                 optbase = &argv[3];
 397
 398         if (shellparam.reset == 1) {
 399                 shellparam.optnext = optbase;
 400                 shellparam.optptr = NULL;
 401                 shellparam.reset = 0;
 402         }
 403
 404         return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
 405                        &shellparam.optptr);
 406 }
 407
 408 STATIC int
 409 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
 410     char **optptr)
 411 {
 412         char *p, *q;
 413         char c = '?';
 414         int done = 0;
 415         int ind = 0;
 416         int err = 0;
 417         char s[10];
 418
 419         if ((p = *optptr) == NULL || *p == '\0') {
 420                 /* Current word is done, advance */
 421                 if (*optnext == NULL)
 422                         return 1;
 423                 p = **optnext;
 424                 if (p == NULL || *p != '-' || *++p == '\0') {
 425 atend:
 426                         ind = *optnext - optfirst + 1;
 427                         *optnext = NULL;
 428                         p = NULL;
 429                         done = 1;
 430                         goto out;
 431                 }
 432                 (*optnext)++;
 433                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 434                         goto atend;
 435         }
 436
 437         c = *p++;
 438         for (q = optstr; *q != c; ) {
 439                 if (*q == '\0') {
 440                         if (optstr[0] == ':') {
 441                                 s[0] = c;
 442                                 s[1] = '\0';
 443                                 err |= setvarsafe("OPTARG", s, 0);
 444                         }
 445                         else {
 446                                 out1fmt("Illegal option -%c\n", c);
 447                                 (void) unsetvar("OPTARG");
 448                         }
 449                         c = '?';
 450                         goto bad;
 451                 }
 452                 if (*++q == ':')
 453                         q++;
 454         }
 455
 456         if (*++q == ':') {
 457                 if (*p == '\0' && (p = **optnext) == NULL) {
 458                         if (optstr[0] == ':') {
 459                                 s[0] = c;
 460                                 s[1] = '\0';
 461                                 err |= setvarsafe("OPTARG", s, 0);
 462                                 c = ':';
 463                         }
 464                         else {
 465                                 out1fmt("No arg for -%c option\n", c);
 466                                 (void) unsetvar("OPTARG");
 467                                 c = '?';
 468                         }
 469                         goto bad;
 470                 }
 471
 472                 if (p == **optnext)
 473                         (*optnext)++;
 474                 setvarsafe("OPTARG", p, 0);
 475                 p = NULL;
 476         }
 477         else
 478                 setvarsafe("OPTARG", "", 0);
 479         ind = *optnext - optfirst + 1;
 480         goto out;
 481
 482 bad:
 483         ind = 1;
 484         *optnext = NULL;
 485         p = NULL;
 486 out:
 487         *optptr = p;
 488         fmtstr(s, sizeof(s), "%d", ind);
 489         err |= setvarsafe("OPTIND", s, VNOFUNC);
 490         s[0] = c;
 491         s[1] = '\0';
 492         err |= setvarsafe(optvar, s, 0);
 493         if (err) {
 494                 *optnext = NULL;
 495                 *optptr = NULL;
 496                 flushall();
 497                 exraise(EXERROR);
 498         }
 499         return done;
 500 }
 501
 502 /*
 503  * XXX - should get rid of.  have all builtins use getopt(3).  the
 504  * library getopt must have the BSD extension static variable "optreset"
 505  * otherwise it can't be used within the shell safely.
 506  *
 507  * Standard option processing (a la getopt) for builtin routines.  The
 508  * only argument that is passed to nextopt is the option string; the
 509  * other arguments are unnecessary.  It return the character, or '\0' on
 510  * end of input.
 511  */
 512
 513 int
 514 nextopt(char *optstring)
 515 {
 516         char *p, *q;
 517         char c;
 518
 519         if ((p = optptr) == NULL || *p == '\0') {
 520                 p = *argptr;
 521                 if (p == NULL || *p != '-' || *++p == '\0')
 522                         return '\0';
 523                 argptr++;
 524                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 525                         return '\0';
 526         }
 527         c = *p++;
 528         for (q = optstring ; *q != c ; ) {
 529                 if (*q == '\0')
 530                         error("Illegal option -%c", c);
 531                 if (*++q == ':')
 532                         q++;
 533         }
 534         if (*++q == ':') {
 535                 if (*p == '\0' && (p = *argptr++) == NULL)
 536                         error("No arg for -%c option", c);
 537                 shoptarg = p;
 538                 p = NULL;
 539         }
 540         optptr = p;
 541         return c;
 542 }
 543
 544 /*
 545  * $PchId: options.c,v 1.6 2006/05/29 13:09:12 philip Exp $
 546  */