2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
37 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
48 #define DEFINE_OPTIONS
51 #include "nodes.h" /* for other header files */
63 #include "myhistedit.h"
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 *nextopt_optptr; /* used by nextopt */
72 char *minusc; /* argument to -c option */
75 static void options(int);
76 static void minus_o(char *, int);
77 static void setoption(int, int);
78 static void setoptionbyindex(int, int);
79 static void setparam(int, char **);
80 static int getopts(char *, char *, char **, char ***, char **);
84 * Process the shell command line arguments.
88 procargs(int argc, char **argv)
96 for (i = 0; i < NOPTS; i++)
98 privileged = (getuid() != geteuid() || getgid() != getegid());
100 if (*argptr == NULL && minusc == NULL)
102 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
109 for (i = 0; i < NOPTS; i++)
113 if (sflag == 0 && minusc == NULL) {
114 scriptname = *argptr++;
115 setinputfile(scriptname, 0);
116 commandname = arg0 = scriptname;
118 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
119 if (argptr && minusc && *argptr)
122 shellparam.p = argptr;
123 shellparam.reset = 1;
124 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
144 * Process shell options. The global variable argptr contains a pointer
145 * to the argument list; we advance it past the options.
146 * If cmdline is true, process the shell's argv; otherwise, process arguments
147 * to the set special builtin.
159 while ((p = *argptr) != NULL) {
161 if ((c = *p++) == '-') {
163 /* A "-" or "--" terminates options */
166 if (p[0] == '-' && p[1] == '\0')
169 * For the benefit of `#!' lines in shell scripts,
170 * treat a string of '-- *#.*' the same as '--'.
171 * This is needed so that a script starting with:
172 * #!/bin/sh -- # -*- perl -*-
173 * will continue to work after a change is made to
174 * kern/imgact_shell.c to NOT token-ize the options
175 * specified on a '#!' line. A bit of a kludge,
176 * but that trick is recommended in documentation
177 * for some scripting languages, and we might as
178 * well continue to support it.
182 while (*kp == ' ' || *kp == '\t')
184 if (*kp == '#' || *kp == '\0')
187 } else if (c == '+') {
193 while ((c = *p++) != '\0') {
194 if (c == 'c' && cmdline) {
198 if (q == NULL || minusc != NULL)
199 error("Bad -c option");
201 } else if (c == 'o') {
202 minus_o(*argptr, val);
211 /* When processing `set', a single "-" means turn off -x and -v */
219 * When processing `set', a "--" means the remaining arguments
220 * replace the positional parameters in the active shell. If
221 * there are no remaining options, then all the positional
222 * parameters are cleared (equivalent to doing ``shift $#'').
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
244 /* We need to keep the final argument */
250 minus_o(char *name, int val)
253 const unsigned char *on;
258 /* "Pretty" output. */
259 out1str("Current option settings\n");
260 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
261 out1fmt("%-16.*s%s\n", *on, on + 1,
262 optval[i] ? "on" : "off");
264 /* Output suitable for re-input to shell. */
265 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
266 out1fmt("%s %co %.*s%s",
267 i % 6 == 0 ? "set" : "",
268 optval[i] ? '-' : '+',
270 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
274 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
275 if (*on == len && memcmp(on + 1, name, len) == 0) {
276 setoptionbyindex(i, val);
279 error("Illegal option -o %s", name);
285 setoptionbyindex(int idx, int val)
287 if (&optval[idx] == &privileged && !val && privileged) {
288 if (setgid(getgid()) == -1)
290 if (setuid(getuid()) == -1)
295 /* #%$ hack for ksh semantics */
296 if (&optval[idx] == &Vflag)
298 else if (&optval[idx] == &Eflag)
304 setoption(int flag, int val)
308 for (i = 0; i < NSHORTOPTS; i++)
309 if (optletter[i] == flag) {
310 setoptionbyindex(i, val);
313 error("Illegal option -%c", flag);
318 * Set the shell parameters.
322 setparam(int argc, char **argv)
327 ap = newparam = ckmalloc((argc + 1) * sizeof *ap);
329 *ap++ = savestr(*argv++);
332 freeparam(&shellparam);
333 shellparam.malloc = 1;
334 shellparam.nparam = argc;
335 shellparam.p = newparam;
336 shellparam.optp = NULL;
337 shellparam.reset = 1;
338 shellparam.optnext = NULL;
343 * Free the list of positional parameters.
347 freeparam(struct shparam *param)
352 for (ap = param->p ; *ap ; ap++)
357 for (ap = param->optp ; *ap ; ap++)
366 * The shift builtin command.
370 shiftcmd(int argc, char **argv)
377 if (n > shellparam.nparam)
380 shellparam.nparam -= n;
381 if (shellparam.malloc)
382 for (i = 0; i < n; i++)
383 ckfree(shellparam.p[i]);
384 memmove(shellparam.p, shellparam.p + n,
385 (shellparam.nparam + 1) * sizeof(shellparam.p[0]));
386 shellparam.reset = 1;
394 * The set builtin command.
398 setcmd(int argc, char **argv)
401 return showvarscmd(argc, argv);
405 if (*argptr != NULL) {
406 setparam(argc - (argptr - argv), argptr);
414 getoptsreset(const char *value)
416 while (*value == '0')
418 if (strcmp(value, "1") == 0)
419 shellparam.reset = 1;
423 * The getopts builtin. Shellparam.optnext points to the next argument
424 * to be processed. Shellparam.optptr points to the next character to
425 * be processed in the current argument. If shellparam.optnext is NULL,
426 * then it's the first time getopts has been called.
430 getoptscmd(int argc, char **argv)
432 char **optbase = NULL, **ap;
436 error("usage: getopts optstring var [arg]");
438 if (shellparam.reset == 1) {
440 if (shellparam.optp) {
441 for (ap = shellparam.optp ; *ap ; ap++)
443 ckfree(shellparam.optp);
444 shellparam.optp = NULL;
447 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
448 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
449 for (i = 0; i < argc - 3; i++)
450 shellparam.optp[i] = savestr(argv[i + 3]);
453 optbase = argc == 3 ? shellparam.p : shellparam.optp;
454 shellparam.optnext = optbase;
455 shellparam.optptr = NULL;
456 shellparam.reset = 0;
458 optbase = shellparam.optp ? shellparam.optp : shellparam.p;
460 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
465 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
474 const char *newoptarg = NULL;
476 if ((p = *optptr) == NULL || *p == '\0') {
477 /* Current word is done, advance */
478 if (*optnext == NULL)
481 if (p == NULL || *p != '-' || *++p == '\0') {
483 ind = *optnext - optfirst + 1;
490 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
495 for (q = optstr; *q != c; ) {
497 if (optstr[0] == ':') {
503 out2fmt_flush("Illegal option -%c\n", c);
512 if (*p == '\0' && (p = **optnext) == NULL) {
513 if (optstr[0] == ':') {
520 out2fmt_flush("No arg for -%c option\n", c);
533 if (*optnext != NULL)
534 ind = *optnext - optfirst + 1;
536 if (newoptarg != NULL)
537 err |= setvarsafe("OPTARG", newoptarg, 0);
540 err |= unsetvar("OPTARG");
543 fmtstr(s, sizeof(s), "%d", ind);
544 err |= setvarsafe("OPTIND", s, VNOFUNC);
547 err |= setvarsafe(optvar, s, 0);
558 * Standard option processing (a la getopt) for builtin routines. The
559 * only argument that is passed to nextopt is the option string; the
560 * other arguments are unnecessary. It returns the option, or '\0' on
565 nextopt(const char *optstring)
571 if ((p = nextopt_optptr) == NULL || *p == '\0') {
573 if (p == NULL || *p != '-' || *++p == '\0')
576 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
580 for (q = optstring ; *q != c ; ) {
582 error("Illegal option -%c", c);
587 if (*p == '\0' && (p = *argptr++) == NULL)
588 error("No arg for -%c option", c);