options.c revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
1/*	$NetBSD: options.c,v 1.37 2004/10/30 19:29:27 christos 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
38static char sccsid[] = "@(#)options.c	8.2 (Berkeley) 5/4/95";
39#else
40__RCSID("$NetBSD: options.c,v 1.37 2004/10/30 19:29:27 christos 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
67char *arg0;			/* value of $0 */
68struct shparam shellparam;	/* current positional parameters */
69char **argptr;			/* argument list for builtin commands */
70char *optionarg;		/* set by nextopt (like getopt) */
71char *optptr;			/* used by nextopt */
72
73char *minusc;			/* argument to -c option */
74
75
76STATIC void options(int);
77STATIC void minus_o(char *, int);
78STATIC void setoption(int, int);
79STATIC int getopts(char *, char *, char **, char ***, char **);
80
81
82/*
83 * Process the shell command line arguments.
84 */
85
86void
87procargs(int argc, char **argv)
88{
89	int 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 (mflag == 2)
102		mflag = iflag;
103	for (i = 0; i < NOPTS; i++)
104		if (optlist[i].val == 2)
105			optlist[i].val = 0;
106#if DEBUG == 2
107	debug = 1;
108#endif
109	arg0 = argv[0];
110	if (sflag == 0 && minusc == NULL) {
111		commandname = argv[0];
112		arg0 = *argptr++;
113		setinputfile(arg0, 0);
114		commandname = arg0;
115	}
116	/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
117	if (minusc != NULL) {
118		if (argptr == NULL || *argptr == NULL)
119			error("Bad -c option");
120		minusc = *argptr++;
121		if (*argptr != 0)
122			arg0 = *argptr++;
123	}
124
125	shellparam.p = argptr;
126	shellparam.reset = 1;
127	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
128	while (*argptr) {
129		shellparam.nparam++;
130		argptr++;
131	}
132	optschanged();
133}
134
135
136void
137optschanged(void)
138{
139	setinteractive(iflag);
140#ifdef WITH_HISTORY
141	histedit();
142#endif
143	setjobctl(mflag);
144}
145
146/*
147 * Process shell options.  The global variable argptr contains a pointer
148 * to the argument list; we advance it past the options.
149 */
150
151STATIC void
152options(int cmdline)
153{
154	static char empty[] = "";
155	char *p;
156	int val;
157	int c;
158
159	if (cmdline)
160		minusc = NULL;
161	while ((p = *argptr) != NULL) {
162		argptr++;
163		if ((c = *p++) == '-') {
164			val = 1;
165                        if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
166                                if (!cmdline) {
167                                        /* "-" means turn off -x and -v */
168                                        if (p[0] == '\0')
169                                                xflag = vflag = 0;
170                                        /* "--" means reset params */
171                                        else if (*argptr == NULL)
172						setparam(argptr);
173                                }
174				break;	  /* "-" or  "--" terminates options */
175			}
176		} else if (c == '+') {
177			val = 0;
178		} else {
179			argptr--;
180			break;
181		}
182		while ((c = *p++) != '\0') {
183			if (c == 'c' && cmdline) {
184				/* command is after shell args*/
185				minusc = empty;
186			} else if (c == 'o') {
187				minus_o(*argptr, val);
188				if (*argptr)
189					argptr++;
190			} else {
191				setoption(c, val);
192			}
193		}
194	}
195}
196
197static void
198set_opt_val(int i, int val)
199{
200	int j;
201	int flag;
202
203	if (val && (flag = optlist[i].opt_set)) {
204		/* some options (eg vi/emacs) are mutually exclusive */
205		for (j = 0; j < NOPTS; j++)
206		    if (optlist[j].opt_set == flag)
207			optlist[j].val = 0;
208	}
209	optlist[i].val = val;
210#ifdef DEBUG
211	if (&optlist[i].val == &debug)
212		opentrace();
213#endif
214}
215
216STATIC void
217minus_o(char *name, int val)
218{
219	int i;
220
221	if (name == NULL) {
222		out1str("Current option settings\n");
223		for (i = 0; i < NOPTS; i++)
224			out1fmt("%-16s%s\n", optlist[i].name,
225				optlist[i].val ? "on" : "off");
226	} else {
227		for (i = 0; i < NOPTS; i++)
228			if (equal(name, optlist[i].name)) {
229				set_opt_val(i, val);
230				return;
231			}
232		error("Illegal option -o %s", name);
233	}
234}
235
236
237STATIC void
238setoption(int flag, int val)
239{
240	int i;
241
242	for (i = 0; i < NOPTS; i++)
243		if (optlist[i].letter == flag) {
244			set_opt_val( i, val );
245			return;
246		}
247	error("Illegal option -%c", flag);
248	/* NOTREACHED */
249}
250
251
252
253#ifdef mkinit
254INCLUDE "options.h"
255
256SHELLPROC {
257	int i;
258
259	for (i = 0; optlist[i].name; i++)
260		optlist[i].val = 0;
261	optschanged();
262
263}
264#endif
265
266
267/*
268 * Set the shell parameters.
269 */
270
271void
272setparam(char **argv)
273{
274	char **newparam;
275	char **ap;
276	int nparam;
277
278	for (nparam = 0 ; argv[nparam] ; nparam++);
279	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
280	while (*argv) {
281		*ap++ = savestr(*argv++);
282	}
283	*ap = NULL;
284	freeparam(&shellparam);
285	shellparam.malloc = 1;
286	shellparam.nparam = nparam;
287	shellparam.p = newparam;
288	shellparam.optnext = NULL;
289}
290
291
292/*
293 * Free the list of positional parameters.
294 */
295
296void
297freeparam(volatile struct shparam *param)
298{
299	char **ap;
300
301	if (param->malloc) {
302		for (ap = param->p ; *ap ; ap++)
303			ckfree(*ap);
304		ckfree(param->p);
305	}
306}
307
308
309
310/*
311 * The shift builtin command.
312 */
313
314int
315shiftcmd(int argc, 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(int argc, char **argv)
346{
347	if (argc == 1)
348		return showvars(0, 0, 1);
349	INTOFF;
350	options(0);
351	optschanged();
352	if (*argptr != NULL) {
353		setparam(argptr);
354	}
355	INTON;
356	return 0;
357}
358
359
360void
361getoptsreset(value)
362	const char *value;
363{
364	if (number(value) == 1) {
365		shellparam.optnext = NULL;
366		shellparam.reset = 1;
367	}
368}
369
370/*
371 * The getopts builtin.  Shellparam.optnext points to the next argument
372 * to be processed.  Shellparam.optptr points to the next character to
373 * be processed in the current argument.  If shellparam.optnext is NULL,
374 * then it's the first time getopts has been called.
375 */
376
377int
378getoptscmd(int argc, char **argv)
379{
380	char **optbase;
381
382	if (argc < 3)
383		error("usage: getopts optstring var [arg]");
384	else if (argc == 3)
385		optbase = shellparam.p;
386	else
387		optbase = &argv[3];
388
389	if (shellparam.reset == 1) {
390		shellparam.optnext = optbase;
391		shellparam.optptr = NULL;
392		shellparam.reset = 0;
393	}
394
395	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
396		       &shellparam.optptr);
397}
398
399STATIC int
400getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
401{
402	char *p, *q;
403	char c = '?';
404	int done = 0;
405	int ind = 0;
406	int err = 0;
407	char s[12];
408
409	if ((p = *optpptr) == NULL || *p == '\0') {
410		/* Current word is done, advance */
411		if (*optnext == NULL)
412			return 1;
413		p = **optnext;
414		if (p == NULL || *p != '-' || *++p == '\0') {
415atend:
416			ind = *optnext - optfirst + 1;
417			*optnext = NULL;
418			p = NULL;
419			done = 1;
420			goto out;
421		}
422		(*optnext)++;
423		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
424			goto atend;
425	}
426
427	c = *p++;
428	for (q = optstr; *q != c; ) {
429		if (*q == '\0') {
430			if (optstr[0] == ':') {
431				s[0] = c;
432				s[1] = '\0';
433				err |= setvarsafe("OPTARG", s, 0);
434			} else {
435				outfmt(&errout, "Illegal option -%c\n", c);
436				(void) unsetvar("OPTARG", 0);
437			}
438			c = '?';
439			goto bad;
440		}
441		if (*++q == ':')
442			q++;
443	}
444
445	if (*++q == ':') {
446		if (*p == '\0' && (p = **optnext) == NULL) {
447			if (optstr[0] == ':') {
448				s[0] = c;
449				s[1] = '\0';
450				err |= setvarsafe("OPTARG", s, 0);
451				c = ':';
452			} else {
453				outfmt(&errout, "No arg for -%c option\n", c);
454				(void) unsetvar("OPTARG", 0);
455				c = '?';
456			}
457			goto bad;
458		}
459
460		if (p == **optnext)
461			(*optnext)++;
462		err |= setvarsafe("OPTARG", p, 0);
463		p = NULL;
464	} else
465		err |= setvarsafe("OPTARG", "", 0);
466	ind = *optnext - optfirst + 1;
467	goto out;
468
469bad:
470	ind = 1;
471	*optnext = NULL;
472	p = NULL;
473out:
474	*optpptr = p;
475	fmtstr(s, sizeof(s), "%d", ind);
476	err |= setvarsafe("OPTIND", s, VNOFUNC);
477	s[0] = c;
478	s[1] = '\0';
479	err |= setvarsafe(optvar, s, 0);
480	if (err) {
481		*optnext = NULL;
482		*optpptr = NULL;
483		flushall();
484		exraise(EXERROR);
485	}
486	return done;
487}
488
489/*
490 * XXX - should get rid of.  have all builtins use getopt(3).  the
491 * library getopt must have the BSD extension static variable "optreset"
492 * otherwise it can't be used within the shell safely.
493 *
494 * Standard option processing (a la getopt) for builtin routines.  The
495 * only argument that is passed to nextopt is the option string; the
496 * other arguments are unnecessary.  It return the character, or '\0' on
497 * end of input.
498 */
499
500int
501nextopt(const char *optstring)
502{
503	char *p;
504	const char *q;
505	char c;
506
507	if ((p = optptr) == NULL || *p == '\0') {
508		p = *argptr;
509		if (p == NULL || *p != '-' || *++p == '\0')
510			return '\0';
511		argptr++;
512		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
513			return '\0';
514	}
515	c = *p++;
516	for (q = optstring ; *q != c ; ) {
517		if (*q == '\0')
518			error("Illegal option -%c", c);
519		if (*++q == ':')
520			q++;
521	}
522	if (*++q == ':') {
523		if (*p == '\0' && (p = *argptr++) == NULL)
524			error("No arg for -%c option", c);
525		optionarg = p;
526		p = NULL;
527	}
528	optptr = p;
529	return c;
530}
531