options.c revision 19240 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
23 *
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
34 * SUCH DAMAGE.
35 *
36 *	$Id: options.c,v 1.7 1996/09/01 10:21:16 peter Exp $
37 */
38
39#ifndef lint
40static char sccsid[] = "@(#)options.c	8.2 (Berkeley) 5/4/95";
41#endif /* not lint */
42
43#include <signal.h>
44#include <unistd.h>
45#include <stdlib.h>
46
47#include "shell.h"
48#define DEFINE_OPTIONS
49#include "options.h"
50#undef DEFINE_OPTIONS
51#include "nodes.h"	/* for other header files */
52#include "eval.h"
53#include "jobs.h"
54#include "input.h"
55#include "output.h"
56#include "trap.h"
57#include "var.h"
58#include "memalloc.h"
59#include "error.h"
60#include "mystring.h"
61#ifndef NO_HISTORY
62#include "myhistedit.h"
63#endif
64
65char *arg0;			/* value of $0 */
66struct shparam shellparam;	/* current positional parameters */
67char **argptr;			/* argument list for builtin commands */
68char *optarg;			/* set by nextopt (like getopt) */
69char *optptr;			/* used by nextopt */
70
71char *minusc;			/* argument to -c option */
72
73
74STATIC void options __P((int));
75STATIC void minus_o __P((char *, int));
76STATIC void setoption __P((int, int));
77
78
79/*
80 * Process the shell command line arguments.
81 */
82
83void
84procargs(argc, argv)
85	int argc;
86	char **argv;
87{
88	int i;
89
90	argptr = argv;
91	if (argc > 0)
92		argptr++;
93	for (i = 0; i < NOPTS; i++)
94		optlist[i].val = 2;
95	privileged = (getuid() != geteuid() || getgid() != getegid());
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 (mflag == 2)
102		mflag = iflag;
103	for (i = 0; i < NOPTS; i++)
104		if (optlist[i].val == 2)
105			optlist[i].val = 0;
106	arg0 = argv[0];
107	if (sflag == 0 && minusc == NULL) {
108		commandname = arg0 = *argptr++;
109		setinputfile(commandname, 0);
110	}
111	if (*argptr && minusc)
112		/* Posix.2: first arg after -c cmd is $0, remainder $1... */
113		arg0 = *argptr++;
114	shellparam.p = argptr;
115	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
116	while (*argptr) {
117		shellparam.nparam++;
118		argptr++;
119	}
120	optschanged();
121}
122
123
124void
125optschanged()
126{
127	setinteractive(iflag);
128#ifndef NO_HISTORY
129	histedit();
130#endif
131	setjobctl(mflag);
132}
133
134/*
135 * Process shell options.  The global variable argptr contains a pointer
136 * to the argument list; we advance it past the options.
137 */
138
139STATIC void
140options(cmdline)
141	int cmdline;
142{
143	register char *p;
144	int val;
145	int c;
146
147	if (cmdline)
148		minusc = NULL;
149	while ((p = *argptr) != NULL) {
150		argptr++;
151		if ((c = *p++) == '-') {
152			val = 1;
153                        if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
154                                if (!cmdline) {
155                                        /* "-" means turn off -x and -v */
156                                        if (p[0] == '\0')
157                                                xflag = vflag = 0;
158                                        /* "--" means reset params */
159                                        else if (*argptr == NULL)
160						setparam(argptr);
161                                }
162				break;	  /* "-" or  "--" terminates options */
163			}
164		} else if (c == '+') {
165			val = 0;
166		} else {
167			argptr--;
168			break;
169		}
170		while ((c = *p++) != '\0') {
171			if (c == 'c' && cmdline) {
172				char *q;
173#ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
174				if (*p == '\0')
175#endif
176					q = *argptr++;
177				if (q == NULL || minusc != NULL)
178					error("Bad -c option");
179				minusc = q;
180#ifdef NOHACK
181				break;
182#endif
183			} else if (c == 'o') {
184				minus_o(*argptr, val);
185				if (*argptr)
186					argptr++;
187			} else {
188				if (c == 'p' && !val && privileged) {
189					(void) setuid(getuid());
190					(void) setgid(getgid());
191				}
192				setoption(c, val);
193			}
194		}
195	}
196}
197
198STATIC void
199minus_o(name, val)
200	char *name;
201	int val;
202{
203	int i;
204
205	if (name == NULL) {
206		out1str("Current option settings\n");
207		for (i = 0; i < NOPTS; i++)
208			out1fmt("%-16s%s\n", optlist[i].name,
209				optlist[i].val ? "on" : "off");
210	} else {
211		for (i = 0; i < NOPTS; i++)
212			if (equal(name, optlist[i].name)) {
213				if (!val && privileged && equal(name, "privileged")) {
214					(void) setuid(getuid());
215					(void) setgid(getgid());
216				}
217				setoption(optlist[i].letter, val);
218				return;
219			}
220		error("Illegal option -o %s", name);
221	}
222}
223
224
225STATIC void
226setoption(flag, val)
227	char flag;
228	int val;
229	{
230	int i;
231
232	for (i = 0; i < NOPTS; i++)
233		if (optlist[i].letter == flag) {
234			optlist[i].val = val;
235			if (val) {
236				/* #%$ hack for ksh semantics */
237				if (flag == 'V')
238					Eflag = 0;
239				else if (flag == 'E')
240					Vflag = 0;
241			}
242			return;
243		}
244	error("Illegal option -%c", flag);
245}
246
247
248
249#ifdef mkinit
250INCLUDE "options.h"
251
252SHELLPROC {
253	int i;
254
255	for (i = 0; i < NOPTS; i++)
256		optlist[i].val = 0;
257	optschanged();
258
259}
260#endif
261
262
263/*
264 * Set the shell parameters.
265 */
266
267void
268setparam(argv)
269	char **argv;
270	{
271	char **newparam;
272	char **ap;
273	int nparam;
274
275	for (nparam = 0 ; argv[nparam] ; nparam++);
276	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
277	while (*argv) {
278		*ap++ = savestr(*argv++);
279	}
280	*ap = NULL;
281	freeparam(&shellparam);
282	shellparam.malloc = 1;
283	shellparam.nparam = nparam;
284	shellparam.p = newparam;
285	shellparam.optnext = NULL;
286}
287
288
289/*
290 * Free the list of positional parameters.
291 */
292
293void
294freeparam(param)
295	struct shparam *param;
296	{
297	char **ap;
298
299	if (param->malloc) {
300		for (ap = param->p ; *ap ; ap++)
301			ckfree(*ap);
302		ckfree(param->p);
303	}
304}
305
306
307
308/*
309 * The shift builtin command.
310 */
311
312int
313shiftcmd(argc, argv)
314	int argc;
315	char **argv;
316{
317	int n;
318	char **ap1, **ap2;
319
320	n = 1;
321	if (argc > 1)
322		n = number(argv[1]);
323	if (n > shellparam.nparam)
324		error("can't shift that many");
325	INTOFF;
326	shellparam.nparam -= n;
327	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
328		if (shellparam.malloc)
329			ckfree(*ap1);
330	}
331	ap2 = shellparam.p;
332	while ((*ap2++ = *ap1++) != NULL);
333	shellparam.optnext = NULL;
334	INTON;
335	return 0;
336}
337
338
339
340/*
341 * The set command builtin.
342 */
343
344int
345setcmd(argc, argv)
346	int argc;
347	char **argv;
348{
349	if (argc == 1)
350		return showvarscmd(argc, argv);
351	INTOFF;
352	options(0);
353	optschanged();
354	if (*argptr != NULL) {
355		setparam(argptr);
356	}
357	INTON;
358	return 0;
359}
360
361
362/*
363 * The getopts builtin.  Shellparam.optnext points to the next argument
364 * to be processed.  Shellparam.optptr points to the next character to
365 * be processed in the current argument.  If shellparam.optnext is NULL,
366 * then it's the first time getopts has been called.
367 */
368
369int
370getoptscmd(argc, argv)
371	int argc;
372	char **argv;
373{
374	register char *p, *q;
375	char c;
376	char s[10];
377
378	if (argc != 3)
379		error("Usage: getopts optstring var");
380	if (shellparam.optnext == NULL) {
381		shellparam.optnext = shellparam.p;
382		shellparam.optptr = NULL;
383	}
384	if ((p = shellparam.optptr) == NULL || *p == '\0') {
385		p = *shellparam.optnext;
386		if (p == NULL || *p != '-' || *++p == '\0') {
387atend:
388			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
389			setvar("OPTIND", s, 0);
390			shellparam.optnext = NULL;
391			return 1;
392		}
393		shellparam.optnext++;
394		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
395			goto atend;
396	}
397	c = *p++;
398	for (q = argv[1] ; *q != c ; ) {
399		if (*q == '\0') {
400			out1fmt("Illegal option -%c\n", c);
401			c = '?';
402			goto out;
403		}
404		if (*++q == ':')
405			q++;
406	}
407	if (*++q == ':') {
408		if (*p == '\0' && (p = *shellparam.optnext++) == NULL) {
409			out1fmt("No arg for -%c option\n", c);
410			c = '?';
411			goto out;
412		}
413		setvar("OPTARG", p, 0);
414		p = NULL;
415	}
416out:
417	shellparam.optptr = p;
418	s[0] = c;
419	s[1] = '\0';
420	setvar(argv[2], s, 0);
421	return 0;
422}
423
424/*
425 * XXX - should get rid of.  have all builtins use getopt(3).  the
426 * library getopt must have the BSD extension static variable "optreset"
427 * otherwise it can't be used within the shell safely.
428 *
429 * Standard option processing (a la getopt) for builtin routines.  The
430 * only argument that is passed to nextopt is the option string; the
431 * other arguments are unnecessary.  It return the character, or '\0' on
432 * end of input.
433 */
434
435int
436nextopt(optstring)
437	char *optstring;
438	{
439	register char *p, *q;
440	char c;
441
442	if ((p = optptr) == NULL || *p == '\0') {
443		p = *argptr;
444		if (p == NULL || *p != '-' || *++p == '\0')
445			return '\0';
446		argptr++;
447		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
448			return '\0';
449	}
450	c = *p++;
451	for (q = optstring ; *q != c ; ) {
452		if (*q == '\0')
453			error("Illegal option -%c", c);
454		if (*++q == ':')
455			q++;
456	}
457	if (*++q == ':') {
458		if (*p == '\0' && (p = *argptr++) == NULL)
459			error("No arg for -%c option", c);
460		optarg = p;
461		p = NULL;
462	}
463	optptr = p;
464	return c;
465}
466