2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)options.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/options.c,v 1.38 2011/11/20 21:48:50 jilles Exp $
45 #define DEFINE_OPTIONS
48 #include "nodes.h" /* for other header files */
60 #include "myhistedit.h"
63 char *arg0; /* value of $0 */
64 struct shparam shellparam; /* current positional parameters */
65 char **argptr; /* argument list for builtin commands */
66 const char *shoptarg; /* set by nextopt (like getopt) */
67 char *nextopt_optptr; /* used by nextopt */
69 char *minusc; /* argument to -c option */
72 static void options(int);
73 static void minus_o(char *, int);
74 static void setoption(int, int);
75 static int getopts(char *, char *, char **, char ***, char **);
79 * Process the shell command line arguments.
83 procargs(int argc, char **argv)
91 for (i = 0; i < NOPTS; i++)
93 privileged = (getuid() != geteuid() || getgid() != getegid());
95 if (*argptr == NULL && minusc == NULL)
97 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
104 /* turn on tabcomplete in an interactive shell by default */
106 for (i = 0; i < NOPTS; i++)
107 if (optlist[i].val == 2)
110 if (sflag == 0 && minusc == NULL) {
111 scriptname = *argptr++;
112 setinputfile(scriptname, 0);
113 commandname = arg0 = scriptname;
115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
116 if (argptr && minusc && *argptr)
119 shellparam.p = argptr;
120 shellparam.reset = 1;
121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
133 setinteractive(iflag);
141 * Process shell options. The global variable argptr contains a pointer
142 * to the argument list; we advance it past the options.
154 while ((p = *argptr) != NULL) {
156 if ((c = *p++) == '-') {
158 /* A "-" or "--" terminates options */
161 if (p[0] == '-' && p[1] == '\0')
164 * For the benefit of `#!' lines in shell scripts,
165 * treat a string of '-- *#.*' the same as '--'.
166 * This is needed so that a script starting with:
167 * #!/bin/sh -- # -*- perl -*-
168 * will continue to work after a change is made to
169 * kern/imgact_shell.c to NOT token-ize the options
170 * specified on a '#!' line. A bit of a kludge,
171 * but that trick is recommended in documentation
172 * for some scripting languages, and we might as
173 * well continue to support it.
177 while (*kp == ' ' || *kp == '\t')
179 if (*kp == '#' || *kp == '\0')
182 } else if (c == '+') {
188 while ((c = *p++) != '\0') {
189 if (c == 'c' && cmdline) {
191 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
195 if (q == NULL || minusc != NULL)
196 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 $#'').
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
244 /* We need to keep the final argument */
250 minus_o(char *name, int val)
256 /* "Pretty" output. */
257 out1str("Current option settings\n");
258 for (i = 0; i < NOPTS; i++)
259 out1fmt("%-16s%s\n", optlist[i].name,
260 optlist[i].val ? "on" : "off");
262 /* Output suitable for re-input to shell. */
263 for (i = 0; i < NOPTS; i++)
264 out1fmt("%s %co %s%s",
265 i % 6 == 0 ? "set" : "",
266 optlist[i].val ? '-' : '+',
268 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
271 for (i = 0; i < NOPTS; i++)
272 if (equal(name, optlist[i].name)) {
273 setoption(optlist[i].letter, val);
276 error("Illegal option -o %s", name);
282 setoption(int flag, int val)
286 if (flag == 'p' && !val && privileged) {
287 if (setgid(getgid()) == -1)
289 if (setuid(getuid()) == -1)
292 for (i = 0; i < NOPTS; i++)
293 if (optlist[i].letter == flag) {
294 optlist[i].val = val;
296 /* #%$ hack for ksh semantics */
299 else if (flag == 'E')
304 error("Illegal option -%c", flag);
309 * Set the shell parameters.
313 setparam(char **argv)
319 for (nparam = 0 ; argv[nparam] ; nparam++);
320 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
322 *ap++ = savestr(*argv++);
325 freeparam(&shellparam);
326 shellparam.malloc = 1;
327 shellparam.nparam = nparam;
328 shellparam.p = newparam;
329 shellparam.reset = 1;
330 shellparam.optnext = NULL;
335 * Free the list of positional parameters.
339 freeparam(volatile struct shparam *param)
344 for (ap = param->p ; *ap ; ap++)
353 * The shift builtin command.
357 shiftcmd(int argc, char **argv)
365 if (n > shellparam.nparam)
368 shellparam.nparam -= n;
369 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
370 if (shellparam.malloc)
374 while ((*ap2++ = *ap1++) != NULL);
375 shellparam.reset = 1;
383 * The set command builtin.
387 setcmd(int argc, char **argv)
390 return showvarscmd(argc, argv);
394 if (*argptr != NULL) {
403 getoptsreset(const char *value)
405 while (*value == '0')
407 if (strcmp(value, "1") == 0)
408 shellparam.reset = 1;
412 * The getopts builtin. Shellparam.optnext points to the next argument
413 * to be processed. Shellparam.optptr points to the next character to
414 * be processed in the current argument. If shellparam.optnext is NULL,
415 * then it's the first time getopts has been called.
419 getoptscmd(int argc, char **argv)
421 char **optbase = NULL;
424 error("usage: getopts optstring var [arg]");
426 optbase = shellparam.p;
430 if (shellparam.reset == 1) {
431 shellparam.optnext = optbase;
432 shellparam.optptr = NULL;
433 shellparam.reset = 0;
436 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
441 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
451 if ((p = *optp) == NULL || *p == '\0') {
452 /* Current word is done, advance */
453 if (*optnext == NULL)
456 if (p == NULL || *p != '-' || *++p == '\0') {
458 ind = *optnext - optfirst + 1;
465 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
470 for (q = optstr; *q != c; ) {
472 if (optstr[0] == ':') {
475 err |= setvarsafe("OPTARG", s, 0);
478 out1fmt("Illegal option -%c\n", c);
489 if (*p == '\0' && (p = **optnext) == NULL) {
490 if (optstr[0] == ':') {
493 err |= setvarsafe("OPTARG", s, 0);
497 out1fmt("No arg for -%c option\n", c);
506 setvarsafe("OPTARG", p, 0);
510 setvarsafe("OPTARG", "", 0);
511 ind = *optnext - optfirst + 1;
520 fmtstr(s, sizeof(s), "%d", ind);
521 err |= setvarsafe("OPTIND", s, VNOFUNC);
524 err |= setvarsafe(optvar, s, 0);
535 * XXX - should get rid of. have all builtins use getopt(3). the
536 * library getopt must have the BSD extension static variable "optreset"
537 * otherwise it can't be used within the shell safely.
539 * Standard option processing (a la getopt) for builtin routines. The
540 * only argument that is passed to nextopt is the option string; the
541 * other arguments are unnecessary. It return the character, or '\0' on
546 nextopt(const char *optstring)
552 if ((p = nextopt_optptr) == NULL || *p == '\0') {
554 if (p == NULL || *p != '-' || *++p == '\0')
557 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
561 for (q = optstring ; *q != c ; ) {
563 error("Illegal option -%c", c);
568 if (*p == '\0' && (p = *argptr++) == NULL)
569 error("No arg for -%c option", c);