usr/dash/show.c

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdarg.h>

#include "shell.h"
#include "parser.h"
#include "nodes.h"
#include "mystring.h"
#include "show.h"
#include "options.h"


#ifdef DEBUG
static void shtree(union node *, int, char *, FILE*);
static void shcmd(union node *, FILE *);
static void sharg(union node *, FILE *);
static void indent(int, char *, FILE *);
static void trstring(char *);


void
showtree(union node *n)
{
	trputs("showtree called\n");
	shtree(n, 1, NULL, stdout);
}


static void
shtree(union node *n, int ind, char *pfx, FILE *fp)
{
	struct nodelist *lp;
	const char *s;

	if (n == NULL)
		return;

	indent(ind, pfx, fp);
	switch(n->type) {
	case NSEMI:
		s = "; ";
		goto binop;
	case NAND:
		s = " && ";
		goto binop;
	case NOR:
		s = " || ";
binop:
		shtree(n->nbinary.ch1, ind, NULL, fp);
	   /*    if (ind < 0) */
			fputs(s, fp);
		shtree(n->nbinary.ch2, ind, NULL, fp);
		break;
	case NCMD:
		shcmd(n, fp);
		if (ind >= 0)
			putc('\n', fp);
		break;
	case NPIPE:
		for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
			shcmd(lp->n, fp);
			if (lp->next)
				fputs(" | ", fp);
		}
		if (n->npipe.backgnd)
			fputs(" &", fp);
		if (ind >= 0)
			putc('\n', fp);
		break;
	default:
		fprintf(fp, "<node type %d>", n->type);
		if (ind >= 0)
			putc('\n', fp);
		break;
	}
}


static void
shcmd(union node *cmd, FILE *fp)
{
	union node *np;
	int first;
	const char *s;
	int dftfd;

	first = 1;
	for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
		if (! first)
			putchar(' ');
		sharg(np, fp);
		first = 0;
	}
	for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
		if (! first)
			putchar(' ');
		switch (np->nfile.type) {
			case NTO:	s = ">";  dftfd = 1; break;
			case NCLOBBER:	s = ">|"; dftfd = 1; break;
			case NAPPEND:	s = ">>"; dftfd = 1; break;
			case NTOFD:	s = ">&"; dftfd = 1; break;
			case NFROM:	s = "<";  dftfd = 0; break;
			case NFROMFD:	s = "<&"; dftfd = 0; break;
			case NFROMTO:	s = "<>"; dftfd = 0; break;
			default:  	s = "*error*"; dftfd = 0; break;
		}
		if (np->nfile.fd != dftfd)
			fprintf(fp, "%d", np->nfile.fd);
		fputs(s, fp);
		if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
			fprintf(fp, "%d", np->ndup.dupfd);
		} else {
			sharg(np->nfile.fname, fp);
		}
		first = 0;
	}
}


static void
sharg(union node *arg, FILE *fp)
{
	char *p;
	struct nodelist *bqlist;
	int subtype;

	if (arg->type != NARG) {
		printf("<node type %d>\n", arg->type);
		abort();
	}
	bqlist = arg->narg.backquote;
	for (p = arg->narg.text ; *p ; p++) {
		switch ((signed char)*p) {
		case CTLESC:
			putc(*++p, fp);
			break;
		case CTLVAR:
			putc('$', fp);
			putc('{', fp);
			subtype = *++p;
			if (subtype == VSLENGTH)
				putc('#', fp);

			while (*p != '=')
				putc(*p++, fp);

			if (subtype & VSNUL)
				putc(':', fp);

			switch (subtype & VSTYPE) {
			case VSNORMAL:
				putc('}', fp);
				break;
			case VSMINUS:
				putc('-', fp);
				break;
			case VSPLUS:
				putc('+', fp);
				break;
			case VSQUESTION:
				putc('?', fp);
				break;
			case VSASSIGN:
				putc('=', fp);
				break;
			case VSTRIMLEFT:
				putc('#', fp);
				break;
			case VSTRIMLEFTMAX:
				putc('#', fp);
				putc('#', fp);
				break;
			case VSTRIMRIGHT:
				putc('%', fp);
				break;
			case VSTRIMRIGHTMAX:
				putc('%', fp);
				putc('%', fp);
				break;
			case VSLENGTH:
				break;
			default:
				printf("<subtype %d>", subtype);
			}
			break;
		case CTLENDVAR:
		     putc('}', fp);
		     break;
		case CTLBACKQ:
			putc('$', fp);
			putc('(', fp);
			shtree(bqlist->n, -1, NULL, fp);
			putc(')', fp);
			break;
		default:
			putc(*p, fp);
			break;
		}
	}
}


static void
indent(int amount, char *pfx, FILE *fp)
{
	int i;

	for (i = 0 ; i < amount ; i++) {
		if (pfx && i == amount - 1)
			fputs(pfx, fp);
		putc('\t', fp);
	}
}


/*
 * Debugging stuff.
 */


FILE *tracefile;


void
trputc(int c)
{
	if (debug != 1)
		return;
	putc(c, tracefile);
}

void
trace(const char *fmt, ...)
{
	va_list va;

	if (debug != 1)
		return;
	va_start(va, fmt);
	(void) vfprintf(tracefile, fmt, va);
	va_end(va);
}

void
tracev(const char *fmt, va_list va)
{
	if (debug != 1)
		return;
	(void) vfprintf(tracefile, fmt, va);
}


void
trputs(const char *s)
{
	if (debug != 1)
		return;
	fputs(s, tracefile);
}


static void
trstring(char *s)
{
	char *p;
	char c;

	if (debug != 1)
		return;
	putc('"', tracefile);
	for (p = s ; *p ; p++) {
		switch ((signed char)*p) {
		case '\n':  c = 'n';  goto backslash;
		case '\t':  c = 't';  goto backslash;
		case '\r':  c = 'r';  goto backslash;
		case '"':  c = '"';  goto backslash;
		case '\\':  c = '\\';  goto backslash;
		case CTLESC:  c = 'e';  goto backslash;
		case CTLVAR:  c = 'v';  goto backslash;
		case CTLBACKQ:  c = 'q';  goto backslash;
backslash:	  putc('\\', tracefile);
			putc(c, tracefile);
			break;
		default:
			if (*p >= ' ' && *p <= '~')
				putc(*p, tracefile);
			else {
				putc('\\', tracefile);
				putc(*p >> 6 & 03, tracefile);
				putc(*p >> 3 & 07, tracefile);
				putc(*p & 07, tracefile);
			}
			break;
		}
	}
	putc('"', tracefile);
}


void
trargs(char **ap)
{
	if (debug != 1)
		return;
	while (*ap) {
		trstring(*ap++);
		if (*ap)
			putc(' ', tracefile);
		else
			putc('\n', tracefile);
	}
}


void
opentrace(void)
{
	char s[100];
#ifdef O_APPEND
	int flags;
#endif

	if (debug != 1) {
		if (tracefile)
			fflush(tracefile);
		/* leave open because libedit might be using it */
		return;
	}
#ifdef not_this_way
	{
		char *p;
		if ((p = getenv(homestr)) == NULL) {
			if (geteuid() == 0)
				p = "/";
			else
				p = "/tmp";
		}
		scopy(p, s);
		strcat(s, "/trace");
	}
#else
	scopy("./trace", s);
#endif /* not_this_way */
	if (tracefile) {
		if (!freopen(s, "a", tracefile)) {
			fprintf(stderr, "Can't re-open %s\n", s);
			debug = 0;
			return;
		}
	} else {
		if ((tracefile = fopen(s, "a")) == NULL) {
			fprintf(stderr, "Can't open %s\n", s);
			debug = 0;
			return;
		}
	}
#ifdef O_APPEND
	if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
		fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
#endif
	setlinebuf(tracefile);
	fputs("\nTracing started.\n", tracefile);
}
#endif /* DEBUG */
1	/*-
2	* Copyright (c) 1991, 1993
3	* The Regents of the University of California. All rights reserved.
4	* Copyright (c) 1997-2005
5	* Herbert Xu <herbert@gondor.apana.org.au>. 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 <stdio.h>
36	#include <stdarg.h>
37
38	#include "shell.h"
39	#include "parser.h"
40	#include "nodes.h"
41	#include "mystring.h"
42	#include "show.h"
43	#include "options.h"
44
45
46	#ifdef DEBUG
47	static void shtree(union node , int, char , FILE*);
48	static void shcmd(union node , FILE );
49	static void sharg(union node , FILE );
50	static void indent(int, char , FILE );
51	static void trstring(char *);
52
53
54	void
55	showtree(union node *n)
56	{
57	trputs("showtree called\n");
58	shtree(n, 1, NULL, stdout);
59	}
60
61
62	static void
63	shtree(union node n, int ind, char pfx, FILE *fp)
64	{
65	struct nodelist *lp;
66	const char *s;
67
68	if (n == NULL)
69	return;
70
71	indent(ind, pfx, fp);
72	switch(n->type) {
73	case NSEMI:
74	s = "; ";
75	goto binop;
76	case NAND:
77	s = " && ";
78	goto binop;
79	case NOR:
80	s = " \|\| ";
81	binop:
82	shtree(n->nbinary.ch1, ind, NULL, fp);
83	/* if (ind < 0) */
84	fputs(s, fp);
85	shtree(n->nbinary.ch2, ind, NULL, fp);
86	break;
87	case NCMD:
88	shcmd(n, fp);
89	if (ind >= 0)
90	putc('\n', fp);
91	break;
92	case NPIPE:
93	for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
94	shcmd(lp->n, fp);
95	if (lp->next)
96	fputs(" \| ", fp);
97	}
98	if (n->npipe.backgnd)
99	fputs(" &", fp);
100	if (ind >= 0)
101	putc('\n', fp);
102	break;
103	default:
104	fprintf(fp, "<node type %d>", n->type);
105	if (ind >= 0)
106	putc('\n', fp);
107	break;
108	}
109	}
110
111
112
113	static void
114	shcmd(union node cmd, FILE fp)
115	{
116	union node *np;
117	int first;
118	const char *s;
119	int dftfd;
120
121	first = 1;
122	for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
123	if (! first)
124	putchar(' ');
125	sharg(np, fp);
126	first = 0;
127	}
128	for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
129	if (! first)
130	putchar(' ');
131	switch (np->nfile.type) {
132	case NTO: s = ">"; dftfd = 1; break;
133	case NCLOBBER: s = ">\|"; dftfd = 1; break;
134	case NAPPEND: s = ">>"; dftfd = 1; break;
135	case NTOFD: s = ">&"; dftfd = 1; break;
136	case NFROM: s = "<"; dftfd = 0; break;
137	case NFROMFD: s = "<&"; dftfd = 0; break;
138	case NFROMTO: s = "<>"; dftfd = 0; break;
139	default: s = "error"; dftfd = 0; break;
140	}
141	if (np->nfile.fd != dftfd)
142	fprintf(fp, "%d", np->nfile.fd);
143	fputs(s, fp);
144	if (np->nfile.type == NTOFD \|\| np->nfile.type == NFROMFD) {
145	fprintf(fp, "%d", np->ndup.dupfd);
146	} else {
147	sharg(np->nfile.fname, fp);
148	}
149	first = 0;
150	}
151	}
152
153
154
155	static void
156	sharg(union node arg, FILE fp)
157	{
158	char *p;
159	struct nodelist *bqlist;
160	int subtype;
161
162	if (arg->type != NARG) {
163	printf("<node type %d>\n", arg->type);
164	abort();
165	}
166	bqlist = arg->narg.backquote;
167	for (p = arg->narg.text ; *p ; p++) {
168	switch ((signed char)*p) {
169	case CTLESC:
170	putc(*++p, fp);
171	break;
172	case CTLVAR:
173	putc('$', fp);
174	putc('{', fp);
175	subtype = *++p;
176	if (subtype == VSLENGTH)
177	putc('#', fp);
178
179	while (*p != '=')
180	putc(*p++, fp);
181
182	if (subtype & VSNUL)
183	putc(':', fp);
184
185	switch (subtype & VSTYPE) {
186	case VSNORMAL:
187	putc('}', fp);
188	break;
189	case VSMINUS:
190	putc('-', fp);
191	break;
192	case VSPLUS:
193	putc('+', fp);
194	break;
195	case VSQUESTION:
196	putc('?', fp);
197	break;
198	case VSASSIGN:
199	putc('=', fp);
200	break;
201	case VSTRIMLEFT:
202	putc('#', fp);
203	break;
204	case VSTRIMLEFTMAX:
205	putc('#', fp);
206	putc('#', fp);
207	break;
208	case VSTRIMRIGHT:
209	putc('%', fp);
210	break;
211	case VSTRIMRIGHTMAX:
212	putc('%', fp);
213	putc('%', fp);
214	break;
215	case VSLENGTH:
216	break;
217	default:
218	printf("<subtype %d>", subtype);
219	}
220	break;
221	case CTLENDVAR:
222	putc('}', fp);
223	break;
224	case CTLBACKQ:
225	putc('$', fp);
226	putc('(', fp);
227	shtree(bqlist->n, -1, NULL, fp);
228	putc(')', fp);
229	break;
230	default:
231	putc(*p, fp);
232	break;
233	}
234	}
235	}
236
237
238	static void
239	indent(int amount, char pfx, FILE fp)
240	{
241	int i;
242
243	for (i = 0 ; i < amount ; i++) {
244	if (pfx && i == amount - 1)
245	fputs(pfx, fp);
246	putc('\t', fp);
247	}
248	}
249
250
251
252	/*
253	* Debugging stuff.
254	*/
255
256
257	FILE *tracefile;
258
259
260	void
261	trputc(int c)
262	{
263	if (debug != 1)
264	return;
265	putc(c, tracefile);
266	}
267
268	void
269	trace(const char *fmt, ...)
270	{
271	va_list va;
272
273	if (debug != 1)
274	return;
275	va_start(va, fmt);
276	(void) vfprintf(tracefile, fmt, va);
277	va_end(va);
278	}
279
280	void
281	tracev(const char *fmt, va_list va)
282	{
283	if (debug != 1)
284	return;
285	(void) vfprintf(tracefile, fmt, va);
286	}
287
288
289	void
290	trputs(const char *s)
291	{
292	if (debug != 1)
293	return;
294	fputs(s, tracefile);
295	}
296
297
298	static void
299	trstring(char *s)
300	{
301	char *p;
302	char c;
303
304	if (debug != 1)
305	return;
306	putc('"', tracefile);
307	for (p = s ; *p ; p++) {
308	switch ((signed char)*p) {
309	case '\n': c = 'n'; goto backslash;
310	case '\t': c = 't'; goto backslash;
311	case '\r': c = 'r'; goto backslash;
312	case '"': c = '"'; goto backslash;
313	case '\\': c = '\\'; goto backslash;
314	case CTLESC: c = 'e'; goto backslash;
315	case CTLVAR: c = 'v'; goto backslash;
316	case CTLBACKQ: c = 'q'; goto backslash;
317	backslash: putc('\\', tracefile);
318	putc(c, tracefile);
319	break;
320	default:
321	if (p >= ' ' && p <= '~')
322	putc(*p, tracefile);
323	else {
324	putc('\\', tracefile);
325	putc(*p >> 6 & 03, tracefile);
326	putc(*p >> 3 & 07, tracefile);
327	putc(*p & 07, tracefile);
328	}
329	break;
330	}
331	}
332	putc('"', tracefile);
333	}
334
335
336	void
337	trargs(char **ap)
338	{
339	if (debug != 1)
340	return;
341	while (*ap) {
342	trstring(*ap++);
343	if (*ap)
344	putc(' ', tracefile);
345	else
346	putc('\n', tracefile);
347	}
348	}
349
350
351	void
352	opentrace(void)
353	{
354	char s[100];
355	#ifdef O_APPEND
356	int flags;
357	#endif
358
359	if (debug != 1) {
360	if (tracefile)
361	fflush(tracefile);
362	/* leave open because libedit might be using it */
363	return;
364	}
365	#ifdef not_this_way
366	{
367	char *p;
368	if ((p = getenv(homestr)) == NULL) {
369	if (geteuid() == 0)
370	p = "/";
371	else
372	p = "/tmp";
373	}
374	scopy(p, s);
375	strcat(s, "/trace");
376	}
377	#else
378	scopy("./trace", s);
379	#endif /* not_this_way */
380	if (tracefile) {
381	if (!freopen(s, "a", tracefile)) {
382	fprintf(stderr, "Can't re-open %s\n", s);
383	debug = 0;
384	return;
385	}
386	} else {
387	if ((tracefile = fopen(s, "a")) == NULL) {
388	fprintf(stderr, "Can't open %s\n", s);
389	debug = 0;
390	return;
391	}
392	}
393	#ifdef O_APPEND
394	if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
395	fcntl(fileno(tracefile), F_SETFL, flags \| O_APPEND);
396	#endif
397	setlinebuf(tracefile);
398	fputs("\nTracing started.\n", tracefile);
399	}
400	#endif /* DEBUG */