bin/sh/options.c

   1 /*      $NetBSD: options.c,v 1.40 2005/12/13 17:44:18 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 #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 1.40 2005/12/13 17:44:18 dsl 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 "nodes.h"      /* for other header files */
  53 #include "eval.h"
  54 #include "jobs.h"
  55 #include "input.h"
  56 #include "output.h"
  57 #include "trap.h"
  58 #include "var.h"
  59 #include "memalloc.h"
  60 #include "error.h"
  61 #include "mystring.h"
  62 #ifndef SMALL
  63 #include "myhistedit.h"
  64 #endif
  65 #include "show.h"
  66
  67 char *arg0;                     /* value of $0 */
  68 struct shparam shellparam;      /* current positional parameters */
  69 char **argptr;                  /* argument list for builtin commands */
  70 char *optionarg;                /* set by nextopt (like getopt) */
  71 char *optptr;                   /* used by nextopt */
  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         size_t i;
  90
  91         argptr = argv;
  92         if (argc > 0)
  93                 argptr++;
  94         for (i = 0; i < NOPTS; i++)
  95                 optlist[i].val = 2;
  96         options(1);
  97         if (*argptr == NULL && minusc == NULL)
  98                 sflag = 1;
  99         if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
 100                 iflag = 1;
 101         if (iflag == 1 && sflag == 2)
 102                 iflag = 2;
 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(size_t i, int val)
 201 {
 202         size_t 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         size_t i;
 222
 223         if (name == NULL) {
 224                 if (val) {
 225                         out1str("Current option settings\n");
 226                         for (i = 0; i < NOPTS; i++) {
 227                                 out1fmt("%-16s%s\n", optlist[i].name,
 228                                         optlist[i].val ? "on" : "off");
 229                         }
 230                 } else {
 231                         out1str("set");
 232                         for (i = 0; i < NOPTS; i++) {
 233                                 out1fmt(" %co %s",
 234                                         "+-"[optlist[i].val], optlist[i].name);
 235                         }
 236                         out1str("\n");
 237                 }
 238         } else {
 239                 for (i = 0; i < NOPTS; i++)
 240                         if (equal(name, optlist[i].name)) {
 241                                 set_opt_val(i, val);
 242                                 return;
 243                         }
 244                 error("Illegal option -o %s", name);
 245         }
 246 }
 247
 248
 249 STATIC void
 250 setoption(int flag, int val)
 251 {
 252         size_t i;
 253
 254         for (i = 0; i < NOPTS; i++)
 255                 if (optlist[i].letter == flag) {
 256                         set_opt_val( i, val );
 257                         return;
 258                 }
 259         error("Illegal option -%c", flag);
 260         /* NOTREACHED */
 261 }
 262
 263
 264
 265 #ifdef mkinit
 266 INCLUDE "options.h"
 267
 268 SHELLPROC {
 269         int i;
 270
 271         for (i = 0; optlist[i].name; i++)
 272                 optlist[i].val = 0;
 273         optschanged();
 274
 275 }
 276 #endif
 277
 278
 279 /*
 280  * Set the shell parameters.
 281  */
 282
 283 void
 284 setparam(char **argv)
 285 {
 286         char **newparam;
 287         char **ap;
 288         int nparam;
 289
 290         for (nparam = 0 ; argv[nparam] ; nparam++)
 291                 continue;
 292         ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
 293         while (*argv) {
 294                 *ap++ = savestr(*argv++);
 295         }
 296         *ap = NULL;
 297         freeparam(&shellparam);
 298         shellparam.malloc = 1;
 299         shellparam.nparam = nparam;
 300         shellparam.p = newparam;
 301         shellparam.optnext = NULL;
 302 }
 303
 304
 305 /*
 306  * Free the list of positional parameters.
 307  */
 308
 309 void
 310 freeparam(volatile struct shparam *param)
 311 {
 312         char **ap;
 313
 314         if (param->malloc) {
 315                 for (ap = param->p ; *ap ; ap++)
 316                         ckfree(*ap);
 317                 ckfree(param->p);
 318         }
 319 }
 320
 321
 322
 323 /*
 324  * The shift builtin command.
 325  */
 326
 327 int
 328 shiftcmd(int argc, char **argv)
 329 {
 330         int n;
 331         char **ap1, **ap2;
 332
 333         n = 1;
 334         if (argc > 1)
 335                 n = number(argv[1]);
 336         if (n > shellparam.nparam)
 337                 error("can't shift that many");
 338         INTOFF;
 339         shellparam.nparam -= n;
 340         for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
 341                 if (shellparam.malloc)
 342                         ckfree(*ap1);
 343         }
 344         ap2 = shellparam.p;
 345         while ((*ap2++ = *ap1++) != NULL);
 346         shellparam.optnext = NULL;
 347         INTON;
 348         return 0;
 349 }
 350
 351
 352
 353 /*
 354  * The set command builtin.
 355  */
 356
 357 int
 358 setcmd(int argc, char **argv)
 359 {
 360         if (argc == 1)
 361                 return showvars(0, 0, 1);
 362         INTOFF;
 363         options(0);
 364         optschanged();
 365         if (*argptr != NULL) {
 366                 setparam(argptr);
 367         }
 368         INTON;
 369         return 0;
 370 }
 371
 372
 373 void
 374 getoptsreset(value)
 375         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 }