show.c revision 1.30 1 /* $NetBSD: show.c,v 1.30 2016/02/27 23:50:13 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
38 static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95";
39 #else
40 __RCSID("$NetBSD: show.c,v 1.30 2016/02/27 23:50:13 christos Exp $");
41 #endif
42 #endif /* not lint */
43
44 #include <stdio.h>
45 #include <stdarg.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48
49 #include "shell.h"
50 #include "parser.h"
51 #include "nodes.h"
52 #include "mystring.h"
53 #include "show.h"
54 #include "options.h"
55 #ifndef SMALL
56 #define DEFINE_NODENAMES
57 #include "nodenames.h"
58 #endif
59
60
61 FILE *tracefile;
62
63 #ifdef DEBUG
64 static int shtree(union node *, int, int, char *, FILE*);
65 static int shcmd(union node *, FILE *);
66 static int sharg(union node *, FILE *);
67 static int indent(int, char *, FILE *);
68 static void trstring(char *);
69
70 void
71 showtree(union node *n)
72 {
73 FILE *fp;
74
75 fp = tracefile ? tracefile : stdout;
76
77 trputs("showtree(");
78 if (n == NULL)
79 trputs("NULL");
80 else if (n == NEOF)
81 trputs("NEOF");
82 trputs(") called\n");
83 if (n != NULL && n != NEOF)
84 shtree(n, 1, 1, NULL, fp);
85 }
86
87
88 static int
89 shtree(union node *n, int ind, int nl, char *pfx, FILE *fp)
90 {
91 struct nodelist *lp;
92 const char *s;
93 int len;
94
95 if (n == NULL) {
96 if (nl)
97 fputc('\n', fp);
98 return 0;
99 }
100
101 len = indent(ind, pfx, fp);
102 switch (n->type) {
103 case NSEMI:
104 s = "; ";
105 len += 2;
106 goto binop;
107 case NAND:
108 s = " && ";
109 len += 4;
110 goto binop;
111 case NOR:
112 s = " || ";
113 len += 4;
114 binop:
115 len += shtree(n->nbinary.ch1, 0, 0, NULL, fp);
116 fputs(s, fp);
117 if (len >= 60) {
118 putc('\n', fp);
119 len = indent(ind < 0 ? 2 : ind + 1, pfx, fp);
120 }
121 len += shtree(n->nbinary.ch2, 0, nl, NULL, fp);
122 break;
123 case NCMD:
124 len += shcmd(n, fp);
125 if (nl)
126 len = 0, putc('\n', fp);
127 break;
128 case NPIPE:
129 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
130 len += shcmd(lp->n, fp);
131 if (lp->next) {
132 len += 3, fputs(" | ", fp);
133 if (len >= 60) {
134 fputc('\n', fp);
135 len = indent(ind < 0 ? 2 : ind + 1,
136 pfx, fp);
137 }
138 }
139 }
140 if (n->npipe.backgnd)
141 len += 2, fputs(" &", fp);
142 if (nl || len >= 60)
143 len = 0, fputc('\n', fp);
144 break;
145 default:
146 #ifdef NODETYPENAME
147 len += fprintf(fp, "<node type %d [%s]>", n->type,
148 NODETYPENAME(n->type));
149 #else
150 len += fprintf(fp, "<node type %d>", n->type);
151 #endif
152 if (nl)
153 len = 0, putc('\n', fp);
154 break;
155 }
156 return len;
157 }
158
159
160
161 static int
162 shcmd(union node *cmd, FILE *fp)
163 {
164 union node *np;
165 int first;
166 const char *s;
167 int dftfd;
168 int len = 0;
169
170 first = 1;
171 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
172 if (! first)
173 len++, fputc(' ', fp);
174 len += sharg(np, fp);
175 first = 0;
176 }
177 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
178 if (! first)
179 len++, fputc(' ', fp);
180 switch (np->nfile.type) {
181 case NTO: s = ">"; dftfd = 1; len += 1; break;
182 case NCLOBBER: s = ">|"; dftfd = 1; len += 2; break;
183 case NAPPEND: s = ">>"; dftfd = 1; len += 2; break;
184 case NTOFD: s = ">&"; dftfd = 1; len += 2; break;
185 case NFROM: s = "<"; dftfd = 0; len += 1; break;
186 case NFROMFD: s = "<&"; dftfd = 0; len += 2; break;
187 case NFROMTO: s = "<>"; dftfd = 0; len += 2; break;
188 default: s = "*error*"; dftfd = 0; len += 7; break;
189 }
190 if (np->nfile.fd != dftfd)
191 len += fprintf(fp, "%d", np->nfile.fd);
192 fputs(s, fp);
193 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
194 len += fprintf(fp, "%d", np->ndup.dupfd);
195 } else {
196 len += sharg(np->nfile.fname, fp);
197 }
198 first = 0;
199 }
200 return len;
201 }
202
203
204
205 static int
206 sharg(union node *arg, FILE *fp)
207 {
208 char *p;
209 struct nodelist *bqlist;
210 int subtype;
211 int len = 0;
212
213 if (arg->type != NARG) {
214 fprintf(fp, "<node type %d>\n", arg->type);
215 abort();
216 }
217 bqlist = arg->narg.backquote;
218 for (p = arg->narg.text ; *p ; p++) {
219 switch (*p) {
220 case CTLESC:
221 putc(*++p, fp);
222 len++;
223 break;
224 case CTLVAR:
225 putc('$', fp);
226 putc('{', fp);
227 len += 2;
228 subtype = *++p;
229 if (subtype == VSLENGTH)
230 len++, putc('#', fp);
231
232 while (*++p != '=')
233 len++, putc(*p, fp);
234
235 if (subtype & VSNUL)
236 len++, putc(':', fp);
237
238 switch (subtype & VSTYPE) {
239 case VSNORMAL:
240 putc('}', fp);
241 len++;
242 break;
243 case VSMINUS:
244 putc('-', fp);
245 len++;
246 break;
247 case VSPLUS:
248 putc('+', fp);
249 len++;
250 break;
251 case VSQUESTION:
252 putc('?', fp);
253 len++;
254 break;
255 case VSASSIGN:
256 putc('=', fp);
257 len++;
258 break;
259 case VSTRIMLEFT:
260 putc('#', fp);
261 len++;
262 break;
263 case VSTRIMLEFTMAX:
264 putc('#', fp);
265 putc('#', fp);
266 len += 2;
267 break;
268 case VSTRIMRIGHT:
269 putc('%', fp);
270 len++;
271 break;
272 case VSTRIMRIGHTMAX:
273 putc('%', fp);
274 putc('%', fp);
275 len += 2;
276 break;
277 case VSLENGTH:
278 break;
279 default:
280 len += fprintf(fp, "<subtype %d>", subtype);
281 }
282 break;
283 case CTLENDVAR:
284 putc('}', fp);
285 len++;
286 break;
287 case CTLBACKQ:
288 case CTLBACKQ|CTLQUOTE:
289 putc('$', fp);
290 putc('(', fp);
291 len += shtree(bqlist->n, -1, 0, NULL, fp) + 3;
292 putc(')', fp);
293 break;
294 default:
295 putc(*p, fp);
296 len++;
297 break;
298 }
299 }
300 return len;
301 }
302
303
304 static int
305 indent(int amount, char *pfx, FILE *fp)
306 {
307 int i;
308 int len = 0;
309
310 /*
311 * in practice, pfx is **always** NULL
312 * but here, we assume if it were not, at least strlen(pfx) < 8
313 * if that is invalid, output will look messy
314 */
315 for (i = 0 ; i < amount ; i++) {
316 if (pfx && i == amount - 1)
317 fputs(pfx, fp);
318 putc('\t', fp);
319 len |= 7;
320 len++;
321 }
322 return len;
323 }
324 #endif
325
326
327
328 /*
329 * Debugging stuff.
330 */
331
332
333
334
335 #ifdef DEBUG
336 void
337 trputc(int c)
338 {
339 if (debug != 1 || !tracefile)
340 return;
341 putc(c, tracefile);
342 }
343 #endif
344
345 void
346 trace(const char *fmt, ...)
347 {
348 #ifdef DEBUG
349 va_list va;
350
351 if (debug != 1 || !tracefile)
352 return;
353 va_start(va, fmt);
354 (void) vfprintf(tracefile, fmt, va);
355 va_end(va);
356 #endif
357 }
358
359 void
360 tracev(const char *fmt, va_list va)
361 {
362 #ifdef DEBUG
363 va_list ap;
364 if (debug != 1 || !tracefile)
365 return;
366 va_copy(ap, va);
367 (void) vfprintf(tracefile, fmt, ap);
368 va_end(ap);
369 #endif
370 }
371
372
373 #ifdef DEBUG
374 void
375 trputs(const char *s)
376 {
377 if (debug != 1 || !tracefile)
378 return;
379 fputs(s, tracefile);
380 }
381
382
383 static void
384 trstring(char *s)
385 {
386 char *p;
387 char c;
388
389 if (debug != 1 || !tracefile)
390 return;
391 putc('"', tracefile);
392 for (p = s ; *p ; p++) {
393 switch (*p) {
394 case '\n': c = 'n'; goto backslash;
395 case '\t': c = 't'; goto backslash;
396 case '\r': c = 'r'; goto backslash;
397 case '"': c = '"'; goto backslash;
398 case '\\': c = '\\'; goto backslash;
399 case CTLESC: c = 'e'; goto backslash;
400 case CTLVAR: c = 'v'; goto backslash;
401 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
402 case CTLBACKQ: c = 'q'; goto backslash;
403 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
404 backslash: putc('\\', tracefile);
405 putc(c, tracefile);
406 break;
407 default:
408 if (*p >= ' ' && *p <= '~')
409 putc(*p, tracefile);
410 else {
411 putc('\\', tracefile);
412 putc(*p >> 6 & 03, tracefile);
413 putc(*p >> 3 & 07, tracefile);
414 putc(*p & 07, tracefile);
415 }
416 break;
417 }
418 }
419 putc('"', tracefile);
420 }
421 #endif
422
423
424 void
425 trargs(char **ap)
426 {
427 #ifdef DEBUG
428 if (debug != 1 || !tracefile)
429 return;
430 while (*ap) {
431 trstring(*ap++);
432 if (*ap)
433 putc(' ', tracefile);
434 else
435 putc('\n', tracefile);
436 }
437 #endif
438 }
439
440
441 #ifdef DEBUG
442 void
443 opentrace(void)
444 {
445 char s[100];
446 #ifdef O_APPEND
447 int flags;
448 #endif
449
450 if (debug != 1) {
451 if (tracefile)
452 fflush(tracefile);
453 /* leave open because libedit might be using it */
454 return;
455 }
456 #ifdef not_this_way
457 {
458 char *p;
459 if ((p = getenv("HOME")) == NULL) {
460 if (geteuid() == 0)
461 p = "/";
462 else
463 p = "/tmp";
464 }
465 scopy(p, s);
466 strcat(s, "/trace");
467 }
468 #else
469 snprintf(s, sizeof(s), "./trace.%d", (int)getpid());
470 #endif /* not_this_way */
471 if (tracefile) {
472 if (!freopen(s, "a", tracefile)) {
473 fprintf(stderr, "Can't re-open %s\n", s);
474 tracefile = NULL;
475 debug = 0;
476 return;
477 }
478 } else {
479 if ((tracefile = fopen(s, "a")) == NULL) {
480 fprintf(stderr, "Can't open %s\n", s);
481 debug = 0;
482 return;
483 }
484 }
485 #ifdef O_APPEND
486 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
487 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
488 #endif
489 setlinebuf(tracefile);
490 fputs("\nTracing started.\n", tracefile);
491 }
492 #endif /* DEBUG */
493