bin/sh/options.c

   1 /*      $NetBSD: options.c,v 1.43 2012/03/20 18:42:29 matt Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kenneth Almquist.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)options.c   8.2 (Berkeley) 5/4/95";
  39 #else
  40 __RCSID("$NetBSD: options.c,v 1.43 2012/03/20 18:42:29 matt Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <signal.h>
  45 #include <unistd.h>
  46 #include <stdlib.h>
  47
  48 #include "shell.h"
  49 #define DEFINE_OPTIONS
  50 #include "options.h"
  51 #undef DEFINE_OPTIONS
  52 #include "builtins.h"
  53 #include "nodes.h"      /* for other header files */
  54 #include "eval.h"
  55 #include "jobs.h"
  56 #include "input.h"
  57 #include "output.h"
  58 #include "trap.h"
  59 #include "var.h"
  60 #include "memalloc.h"
  61 #include "error.h"
  62 #include "mystring.h"
  63 #ifndef SMALL
  64 #include "myhistedit.h"
  65 #endif
  66 #include "show.h"
  67
  68 char *arg0;                     /* value of $0 */
  69 struct shparam shellparam;      /* current positional parameters */
  70 char **argptr;                  /* argument list for builtin commands */
  71 char *optionarg;                /* set by nextopt (like getopt) */
  72 char *optptr;                   /* used by nextopt */
  73
  74 char *minusc;                   /* argument to -c option */
  75
  76
  77 STATIC void options(int);
  78 STATIC void minus_o(char *, int);
  79 STATIC void setoption(int, int);
  80 STATIC int getopts(char *, char *, char **, char ***, char **);
  81
  82
  83 /*
  84  * Process the shell command line arguments.
  85  */
  86
  87 void
  88 procargs(int argc, char **argv)
  89 {
  90         size_t i;
  91
  92         argptr = argv;
  93         if (argc > 0)
  94                 argptr++;
  95         for (i = 0; i < NOPTS; i++)
  96                 optlist[i].val = 2;
  97         options(1);
  98         if (*argptr == NULL && minusc == NULL)
  99                 sflag = 1;
 100         if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
 101                 iflag = 1;
 102         if (iflag == 1 && sflag == 2)
 103                 iflag = 2;
 104         if (mflag == 2)
 105                 mflag = iflag;
 106         for (i = 0; i < NOPTS; i++)
 107                 if (optlist[i].val == 2)
 108                         optlist[i].val = 0;
 109 #if DEBUG == 2
 110         debug = 1;
 111 #endif
 112         arg0 = argv[0];
 113         if (sflag == 0 && minusc == NULL) {
 114                 commandname = argv[0];
 115                 arg0 = *argptr++;
 116                 setinputfile(arg0, 0);
 117                 commandname = arg0;
 118         }
 119         /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
 120         if (minusc != NULL) {
 121                 if (argptr == NULL || *argptr == NULL)
 122                         error("Bad -c option");
 123                 minusc = *argptr++;
 124                 if (*argptr != 0)
 125                         arg0 = *argptr++;
 126         }
 127
 128         shellparam.p = argptr;
 129         shellparam.reset = 1;
 130         /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
 131         while (*argptr) {
 132                 shellparam.nparam++;
 133                 argptr++;
 134         }
 135         optschanged();
 136 }
 137
 138
 139 void
 140 optschanged(void)
 141 {
 142         setinteractive(iflag);
 143 #ifndef SMALL
 144         histedit();
 145 #endif
 146         setjobctl(mflag);
 147 }
 148
 149 /*
 150  * Process shell options.  The global variable argptr contains a pointer
 151  * to the argument list; we advance it past the options.
 152  */
 153
 154 STATIC void
 155 options(int cmdline)
 156 {
 157         static char empty[] = "";
 158         char *p;
 159         int val;
 160         int c;
 161
 162         if (cmdline)
 163                 minusc = NULL;
 164         while ((p = *argptr) != NULL) {
 165                 argptr++;
 166                 if ((c = *p++) == '-') {
 167                         val = 1;
 168                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
 169                                 if (!cmdline) {
 170                                         /* "-" means turn off -x and -v */
 171                                         if (p[0] == '\0')
 172                                                 xflag = vflag = 0;
 173                                         /* "--" means reset params */
 174                                         else if (*argptr == NULL)
 175                                                 setparam(argptr);
 176                                 }
 177                                 break;    /* "-" or  "--" terminates options */
 178                         }
 179                 } else if (c == '+') {
 180                         val = 0;
 181                 } else {
 182                         argptr--;
 183                         break;
 184                 }
 185                 while ((c = *p++) != '\0') {
 186                         if (c == 'c' && cmdline) {
 187                                 /* command is after shell args*/
 188                                 minusc = empty;
 189                         } else if (c == 'o') {
 190                                 minus_o(*argptr, val);
 191                                 if (*argptr)
 192                                         argptr++;
 193                         } else {
 194                                 setoption(c, val);
 195                         }
 196                 }
 197         }
 198 }
 199
 200 static void
 201 set_opt_val(size_t i, int val)
 202 {
 203         size_t j;
 204         int flag;
 205
 206         if (val && (flag = optlist[i].opt_set)) {
 207                 /* some options (eg vi/emacs) are mutually exclusive */
 208                 for (j = 0; j < NOPTS; j++)
 209                     if (optlist[j].opt_set == flag)
 210                         optlist[j].val = 0;
 211         }
 212         optlist[i].val = val;
 213 #ifdef DEBUG
 214         if (&optlist[i].val == &debug)
 215                 opentrace();
 216 #endif
 217 }
 218
 219 STATIC void
 220 minus_o(char *name, int val)
 221 {
 222         size_t i;
 223
 224         if (name == NULL) {
 225                 if (val) {
 226                         out1str("Current option settings\n");
 227                         for (i = 0; i < NOPTS; i++) {
 228                                 out1fmt("%-16s%s\n", optlist[i].name,
 229                                         optlist[i].val ? "on" : "off");
 230                         }
 231                 } else {
 232                         out1str("set");
 233                         for (i = 0; i < NOPTS; i++) {
 234                                 out1fmt(" %co %s",
 235                                         "+-"[optlist[i].val], optlist[i].name);
 236                         }
 237                         out1str("\n");
 238                 }
 239         } else {
 240                 for (i = 0; i < NOPTS; i++)
 241                         if (equal(name, optlist[i].name)) {
 242                                 set_opt_val(i, val);
 243                                 return;
 244                         }
 245                 error("Illegal option -o %s", name);
 246         }
 247 }
 248
 249
 250 STATIC void
 251 setoption(int flag, int val)
 252 {
 253         size_t i;
 254
 255         for (i = 0; i < NOPTS; i++)
 256                 if (optlist[i].letter == flag) {
 257                         set_opt_val( i, val );
 258                         return;
 259                 }
 260         error("Illegal option -%c", flag);
 261         /* NOTREACHED */
 262 }
 263
 264
 265
 266 #ifdef mkinit
 267 INCLUDE "options.h"
 268
 269 SHELLPROC {
 270         int i;
 271
 272         for (i = 0; optlist[i].name; i++)
 273                 optlist[i].val = 0;
 274         optschanged();
 275
 276 }
 277 #endif
 278
 279
 280 /*
 281  * Set the shell parameters.
 282  */
 283
 284 void
 285 setparam(char **argv)
 286 {
 287         char **newparam;
 288         char **ap;
 289         int nparam;
 290
 291         for (nparam = 0 ; argv[nparam] ; nparam++)
 292                 continue;
 293         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 294         while (*argv) {
 295                 *ap++ = savestr(*argv++);
 296         }
 297         *ap = NULL;
 298         freeparam(&shellparam);
 299         shellparam.malloc = 1;
 300         shellparam.nparam = nparam;
 301         shellparam.p = newparam;
 302         shellparam.optnext = NULL;
 303 }
 304
 305
 306 /*
 307  * Free the list of positional parameters.
 308  */
 309
 310 void
 311 freeparam(volatile struct shparam *param)
 312 {
 313         char **ap;
 314
 315         if (param->malloc) {
 316                 for (ap = param->p ; *ap ; ap++)
 317                         ckfree(*ap);
 318                 ckfree(param->p);
 319         }
 320 }
 321
 322
 323
 324 /*
 325  * The shift builtin command.
 326  */
 327
 328 int
 329 shiftcmd(int argc, char **argv)
 330 {
 331         int n;
 332         char **ap1, **ap2;
 333
 334         n = 1;
 335         if (argc > 1)
 336                 n = number(argv[1]);
 337         if (n > shellparam.nparam)
 338                 error("can't shift that many");
 339         INTOFF;
 340         shellparam.nparam -= n;
 341         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 342                 if (shellparam.malloc)
 343                         ckfree(*ap1);
 344         }
 345         ap2 = shellparam.p;
 346         while ((*ap2++ = *ap1++) != NULL);
 347         shellparam.optnext = NULL;
 348         INTON;
 349         return 0;
 350 }
 351
 352
 353
 354 /*
 355  * The set command builtin.
 356  */
 357
 358 int
 359 setcmd(int argc, char **argv)
 360 {
 361         if (argc == 1)
 362                 return showvars(0, 0, 1);
 363         INTOFF;
 364         options(0);
 365         optschanged();
 366         if (*argptr != NULL) {
 367                 setparam(argptr);
 368         }
 369         INTON;
 370         return 0;
 371 }
 372
 373
 374 void
 375 getoptsreset(const char *value)
 376 {
 377         if (number(value) == 1) {
 378                 shellparam.optnext = NULL;
 379                 shellparam.reset = 1;
 380         }
 381 }
 382
 383 /*
 384  * The getopts builtin.  Shellparam.optnext points to the next argument
 385  * to be processed.  Shellparam.optptr points to the next character to
 386  * be processed in the current argument.  If shellparam.optnext is NULL,
 387  * then it's the first time getopts has been called.
 388  */
 389
 390 int
 391 getoptscmd(int argc, char **argv)
 392 {
 393         char **optbase;
 394
 395         if (argc < 3)
 396                 error("usage: getopts optstring var [arg]");
 397         else if (argc == 3)
 398                 optbase = shellparam.p;
 399         else
 400                 optbase = &argv[3];
 401
 402         if (shellparam.reset == 1) {
 403                 shellparam.optnext = optbase;
 404                 shellparam.optptr = NULL;
 405                 shellparam.reset = 0;
 406         }
 407
 408         return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
 409                        &shellparam.optptr);
 410 }
 411
 412 STATIC int
 413 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
 414 {
 415         char *p, *q;
 416         char c = '?';
 417         int done = 0;
 418         int ind = 0;
 419         int err = 0;
 420         char s[12];
 421
 422         if ((p = *optpptr) == NULL || *p == '\0') {
 423                 /* Current word is done, advance */
 424                 if (*optnext == NULL)
 425                         return 1;
 426                 p = **optnext;
 427                 if (p == NULL || *p != '-' || *++p == '\0') {
 428 atend:
 429                         ind = *optnext - optfirst + 1;
 430                         *optnext = NULL;
 431                         p = NULL;
 432                         done = 1;
 433                         goto out;
 434                 }
 435                 (*optnext)++;
 436                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 437                         goto atend;
 438         }
 439
 440         c = *p++;
 441         for (q = optstr; *q != c; ) {
 442                 if (*q == '\0') {
 443                         if (optstr[0] == ':') {
 444                                 s[0] = c;
 445                                 s[1] = '\0';
 446                                 err |= setvarsafe("OPTARG", s, 0);
 447                         } else {
 448                                 outfmt(&errout, "Illegal option -%c\n", c);
 449                                 (void) unsetvar("OPTARG", 0);
 450                         }
 451                         c = '?';
 452                         goto bad;
 453                 }
 454                 if (*++q == ':')
 455                         q++;
 456         }
 457
 458         if (*++q == ':') {
 459                 if (*p == '\0' && (p = **optnext) == NULL) {
 460                         if (optstr[0] == ':') {
 461                                 s[0] = c;
 462                                 s[1] = '\0';
 463                                 err |= setvarsafe("OPTARG", s, 0);
 464                                 c = ':';
 465                         } else {
 466                                 outfmt(&errout, "No arg for -%c option\n", c);
 467                                 (void) unsetvar("OPTARG", 0);
 468                                 c = '?';
 469                         }
 470                         goto bad;
 471                 }
 472
 473                 if (p == **optnext)
 474                         (*optnext)++;
 475                 err |= setvarsafe("OPTARG", p, 0);
 476                 p = NULL;
 477         } else
 478                 err |= 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         *optpptr = 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                 *optpptr = 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(const char *optstring)
 515 {
 516         char *p;
 517         const char *q;
 518         char c;
 519
 520         if ((p = optptr) == NULL || *p == '\0') {
 521                 p = *argptr;
 522                 if (p == NULL || *p != '-' || *++p == '\0')
 523                         return '\0';
 524                 argptr++;
 525                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 526                         return '\0';
 527         }
 528         c = *p++;
 529         for (q = optstring ; *q != c ; ) {
 530                 if (*q == '\0')
 531                         error("Illegal option -%c", c);
 532                 if (*++q == ':')
 533                         q++;
 534         }
 535         if (*++q == ':') {
 536                 if (*p == '\0' && (p = *argptr++) == NULL)
 537                         error("No arg for -%c option", c);
 538                 optionarg = p;
 539                 p = NULL;
 540         }
 541         optptr = p;
 542         return c;
 543 }