src/ash/options.c

   1 /*      $NetBSD: options.c,v 1.38 2005/03/20 21:38:17 dsl 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 #ifdef HAVE_SYS_CDEFS_H
  36 #include <sys/cdefs.h>
  37 #endif
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)options.c   8.2 (Berkeley) 5/4/95";
  41 #else
  42 __RCSID("$NetBSD: options.c,v 1.38 2005/03/20 21:38:17 dsl Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <signal.h>
  47 #include <unistd.h>
  48 #include <stdlib.h>
  49
  50 #include "shell.h"
  51 #define DEFINE_OPTIONS
  52 #include "options.h"
  53 #undef DEFINE_OPTIONS
  54 #include "nodes.h"      /* for other header files */
  55 #include "eval.h"
  56 #include "jobs.h"
  57 #include "input.h"
  58 #include "output.h"
  59 #include "trap.h"
  60 #include "var.h"
  61 #include "memalloc.h"
  62 #include "error.h"
  63 #include "mystring.h"
  64 #ifndef SMALL
  65 #include "myhistedit.h"
  66 #endif
  67 #include "show.h"
  68
  69 char *arg0;                     /* value of $0 */
  70 struct shparam shellparam;      /* current positional parameters */
  71 char **argptr;                  /* argument list for builtin commands */
  72 char *optionarg;                /* set by nextopt (like getopt) */
  73 char *optptr;                   /* used by nextopt */
  74
  75 char *minusc;                   /* argument to -c option */
  76
  77
  78 STATIC void options(int);
  79 STATIC void minus_o(char *, int);
  80 STATIC void setoption(int, int);
  81 STATIC int getopts(char *, char *, char **, char ***, char **);
  82
  83
  84 /*
  85  * Process the shell command line arguments.
  86  */
  87
  88 void
  89 procargs(int argc, char **argv)
  90 {
  91         int i;
  92
  93         argptr = argv;
  94         if (argc > 0)
  95                 argptr++;
  96         for (i = 0; i < NOPTS; i++)
  97                 optlist[i].val = 2;
  98         options(1);
  99         if (*argptr == NULL && minusc == NULL)
 100                 sflag = 1;
 101         if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
 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 #if DEBUG == 2
 109         debug = 1;
 110 #endif
 111         arg0 = argv[0];
 112         if (sflag == 0 && minusc == NULL) {
 113                 commandname = argv[0];
 114                 arg0 = *argptr++;
 115                 setinputfile(arg0, 0);
 116                 commandname = arg0;
 117         }
 118         /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
 119         if (minusc != NULL) {
 120                 if (argptr == NULL || *argptr == NULL)
 121                         error("Bad -c option");
 122                 minusc = *argptr++;
 123                 if (*argptr != 0)
 124                         arg0 = *argptr++;
 125         }
 126
 127         shellparam.p = argptr;
 128         shellparam.reset = 1;
 129         /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
 130         while (*argptr) {
 131                 shellparam.nparam++;
 132                 argptr++;
 133         }
 134         optschanged();
 135 }
 136
 137
 138 void
 139 optschanged(void)
 140 {
 141         setinteractive(iflag);
 142 #ifndef SMALL
 143         histedit();
 144 #endif
 145         setjobctl(mflag);
 146 }
 147
 148 /*
 149  * Process shell options.  The global variable argptr contains a pointer
 150  * to the argument list; we advance it past the options.
 151  */
 152
 153 STATIC void
 154 options(int cmdline)
 155 {
 156         static char empty[] = "";
 157         char *p;
 158         int val;
 159         int c;
 160
 161         if (cmdline)
 162                 minusc = NULL;
 163         while ((p = *argptr) != NULL) {
 164                 argptr++;
 165                 if ((c = *p++) == '-') {
 166                         val = 1;
 167                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
 168                                 if (!cmdline) {
 169                                         /* "-" means turn off -x and -v */
 170                                         if (p[0] == '\0')
 171                                                 xflag = vflag = 0;
 172                                         /* "--" means reset params */
 173                                         else if (*argptr == NULL)
 174                                                 setparam(argptr);
 175                                 }
 176                                 break;    /* "-" or  "--" terminates options */
 177                         }
 178                 } else if (c == '+') {
 179                         val = 0;
 180                 } else {
 181                         argptr--;
 182                         break;
 183                 }
 184                 while ((c = *p++) != '\0') {
 185                         if (c == 'c' && cmdline) {
 186                                 /* command is after shell args*/
 187                                 minusc = empty;
 188                         } else if (c == 'o') {
 189                                 minus_o(*argptr, val);
 190                                 if (*argptr)
 191                                         argptr++;
 192                         } else {
 193                                 setoption(c, val);
 194                         }
 195                 }
 196         }
 197 }
 198
 199 static void
 200 set_opt_val(int i, int val)
 201 {
 202         int j;
 203         int flag;
 204
 205         if (val && (flag = optlist[i].opt_set)) {
 206                 /* some options (eg vi/emacs) are mutually exclusive */
 207                 for (j = 0; j < NOPTS; j++)
 208                     if (optlist[j].opt_set == flag)
 209                         optlist[j].val = 0;
 210         }
 211         optlist[i].val = val;
 212 #ifdef DEBUG
 213         if (&optlist[i].val == &debug)
 214                 opentrace();
 215 #endif
 216 }
 217
 218 STATIC void
 219 minus_o(char *name, int val)
 220 {
 221         int i;
 222
 223         if (name == NULL) {
 224                 out1str("Current option settings\n");
 225                 for (i = 0; i < NOPTS; i++)
 226                         out1fmt("%-16s%s\n", optlist[i].name,
 227                                 optlist[i].val ? "on" : "off");
 228         } else {
 229                 for (i = 0; i < NOPTS; i++)
 230                         if (equal(name, optlist[i].name)) {
 231                                 set_opt_val(i, val);
 232                                 return;
 233                         }
 234                 error("Illegal option -o %s", name);
 235         }
 236 }
 237
 238
 239 STATIC void
 240 setoption(int flag, int val)
 241 {
 242         int i;
 243
 244         for (i = 0; i < NOPTS; i++)
 245                 if (optlist[i].letter == flag) {
 246                         set_opt_val( i, val );
 247                         return;
 248                 }
 249         error("Illegal option -%c", flag);
 250         /* NOTREACHED */
 251 }
 252
 253
 254
 255 #ifdef mkinit
 256 INCLUDE "options.h"
 257
 258 SHELLPROC {
 259         int i;
 260
 261         for (i = 0; optlist[i].name; i++)
 262                 optlist[i].val = 0;
 263         optschanged();
 264
 265 }
 266 #endif
 267
 268
 269 /*
 270  * Set the shell parameters.
 271  */
 272
 273 void
 274 setparam(char **argv)
 275 {
 276         char **newparam;
 277         char **ap;
 278         int nparam;
 279
 280         for (nparam = 0 ; argv[nparam] ; nparam++)
 281                 continue;
 282         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 283         while (*argv) {
 284                 *ap++ = savestr(*argv++);
 285         }
 286         *ap = NULL;
 287         freeparam(&shellparam);
 288         shellparam.malloc = 1;
 289         shellparam.nparam = nparam;
 290         shellparam.p = newparam;
 291         shellparam.optnext = NULL;
 292 }
 293
 294
 295 /*
 296  * Free the list of positional parameters.
 297  */
 298
 299 void
 300 freeparam(volatile struct shparam *param)
 301 {
 302         char **ap;
 303
 304         if (param->malloc) {
 305                 for (ap = param->p ; *ap ; ap++)
 306                         ckfree(*ap);
 307                 ckfree(param->p);
 308         }
 309 }
 310
 311
 312
 313 /*
 314  * The shift builtin command.
 315  */
 316
 317 int
 318 shiftcmd(int argc, char **argv)
 319 {
 320         int n;
 321         char **ap1, **ap2;
 322
 323         n = 1;
 324         if (argc > 1)
 325                 n = number(argv[1]);
 326         if (n > shellparam.nparam)
 327                 error("can't shift that many");
 328         INTOFF;
 329         shellparam.nparam -= n;
 330         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 331                 if (shellparam.malloc)
 332                         ckfree(*ap1);
 333         }
 334         ap2 = shellparam.p;
 335         while ((*ap2++ = *ap1++) != NULL);
 336         shellparam.optnext = NULL;
 337         INTON;
 338         return 0;
 339 }
 340
 341
 342
 343 /*
 344  * The set command builtin.
 345  */
 346
 347 int
 348 setcmd(int argc, char **argv)
 349 {
 350         if (argc == 1)
 351                 return showvars(0, 0, 1);
 352         INTOFF;
 353         options(0);
 354         optschanged();
 355         if (*argptr != NULL) {
 356                 setparam(argptr);
 357         }
 358         INTON;
 359         return 0;
 360 }
 361
 362
 363 void
 364 getoptsreset(value)
 365         const char *value;
 366 {
 367         if (number(value) == 1) {
 368                 shellparam.optnext = NULL;
 369                 shellparam.reset = 1;
 370         }
 371 }
 372
 373 /*
 374  * The getopts builtin.  Shellparam.optnext points to the next argument
 375  * to be processed.  Shellparam.optptr points to the next character to
 376  * be processed in the current argument.  If shellparam.optnext is NULL,
 377  * then it's the first time getopts has been called.
 378  */
 379
 380 int
 381 getoptscmd(int argc, char **argv)
 382 {
 383         char **optbase;
 384
 385         if (argc < 3)
 386                 error("usage: getopts optstring var [arg]");
 387         else if (argc == 3)
 388                 optbase = shellparam.p;
 389         else
 390                 optbase = &argv[3];
 391
 392         if (shellparam.reset == 1) {
 393                 shellparam.optnext = optbase;
 394                 shellparam.optptr = NULL;
 395                 shellparam.reset = 0;
 396         }
 397
 398         return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
 399                        &shellparam.optptr);
 400 }
 401
 402 STATIC int
 403 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
 404 {
 405         char *p, *q;
 406         char c = '?';
 407         int done = 0;
 408         int ind = 0;
 409         int err = 0;
 410         char s[12];
 411
 412         if ((p = *optpptr) == NULL || *p == '\0') {
 413                 /* Current word is done, advance */
 414                 if (*optnext == NULL)
 415                         return 1;
 416                 p = **optnext;
 417                 if (p == NULL || *p != '-' || *++p == '\0') {
 418 atend:
 419                         ind = *optnext - optfirst + 1;
 420                         *optnext = NULL;
 421                         p = NULL;
 422                         done = 1;
 423                         goto out;
 424                 }
 425                 (*optnext)++;
 426                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 427                         goto atend;
 428         }
 429
 430         c = *p++;
 431         for (q = optstr; *q != c; ) {
 432                 if (*q == '\0') {
 433                         if (optstr[0] == ':') {
 434                                 s[0] = c;
 435                                 s[1] = '\0';
 436                                 err |= setvarsafe("OPTARG", s, 0);
 437                         } else {
 438                                 outfmt(&errout, "Illegal option -%c\n", c);
 439                                 (void) unsetvar("OPTARG", 0);
 440                         }
 441                         c = '?';
 442                         goto bad;
 443                 }
 444                 if (*++q == ':')
 445                         q++;
 446         }
 447
 448         if (*++q == ':') {
 449                 if (*p == '\0' && (p = **optnext) == NULL) {
 450                         if (optstr[0] == ':') {
 451                                 s[0] = c;
 452                                 s[1] = '\0';
 453                                 err |= setvarsafe("OPTARG", s, 0);
 454                                 c = ':';
 455                         } else {
 456                                 outfmt(&errout, "No arg for -%c option\n", c);
 457                                 (void) unsetvar("OPTARG", 0);
 458                                 c = '?';
 459                         }
 460                         goto bad;
 461                 }
 462
 463                 if (p == **optnext)
 464                         (*optnext)++;
 465                 err |= setvarsafe("OPTARG", p, 0);
 466                 p = NULL;
 467         } else
 468                 err |= setvarsafe("OPTARG", "", 0);
 469         ind = *optnext - optfirst + 1;
 470         goto out;
 471
 472 bad:
 473         ind = 1;
 474         *optnext = NULL;
 475         p = NULL;
 476 out:
 477         *optpptr = p;
 478         fmtstr(s, sizeof(s), "%d", ind);
 479         err |= setvarsafe("OPTIND", s, VNOFUNC);
 480         s[0] = c;
 481         s[1] = '\0';
 482         err |= setvarsafe(optvar, s, 0);
 483         if (err) {
 484                 *optnext = NULL;
 485                 *optpptr = NULL;
 486                 output_flushall();
 487                 exraise(EXERROR);
 488         }
 489         return done;
 490 }
 491
 492 /*
 493  * XXX - should get rid of.  have all builtins use getopt(3).  the
 494  * library getopt must have the BSD extension static variable "optreset"
 495  * otherwise it can't be used within the shell safely.
 496  *
 497  * Standard option processing (a la getopt) for builtin routines.  The
 498  * only argument that is passed to nextopt is the option string; the
 499  * other arguments are unnecessary.  It return the character, or '\0' on
 500  * end of input.
 501  */
 502
 503 int
 504 nextopt(const char *optstring)
 505 {
 506         char *p;
 507         const char *q;
 508         char c;
 509
 510         if ((p = optptr) == NULL || *p == '\0') {
 511                 p = *argptr;
 512                 if (p == NULL || *p != '-' || *++p == '\0')
 513                         return '\0';
 514                 argptr++;
 515                 if (p[0] == '-' && p[1] == '\0')        /* check for "--" */
 516                         return '\0';
 517         }
 518         c = *p++;
 519         for (q = optstring ; *q != c ; ) {
 520                 if (*q == '\0')
 521                         error("Illegal option -%c", c);
 522                 if (*++q == ':')
 523                         q++;
 524         }
 525         if (*++q == ':') {
 526                 if (*p == '\0' && (p = *argptr++) == NULL)
 527                         error("No arg for -%c option", c);
 528                 optionarg = p;
 529                 p = NULL;
 530         }
 531         optptr = p;
 532         return c;
 533 }