show.c revision 1.23 1 /* $NetBSD: show.c,v 1.23 2002/11/24 22:35:43 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. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)show.c 8.3 (Berkeley) 5/4/95";
43 #else
44 __RCSID("$NetBSD: show.c,v 1.23 2002/11/24 22:35:43 christos Exp $");
45 #endif
46 #endif /* not lint */
47
48 #include <stdio.h>
49 #include <stdarg.h>
50
51 #include "shell.h"
52 #include "parser.h"
53 #include "nodes.h"
54 #include "mystring.h"
55 #include "show.h"
56 #include "options.h"
57
58
59 #ifdef DEBUG
60 static void shtree(union node *, int, char *, FILE*);
61 static void shcmd(union node *, FILE *);
62 static void sharg(union node *, FILE *);
63 static void indent(int, char *, FILE *);
64 static void trstring(char *);
65
66
67 void
68 showtree(union node *n)
69 {
70 trputs("showtree called\n");
71 shtree(n, 1, NULL, stdout);
72 }
73
74
75 static void
76 shtree(union node *n, int ind, char *pfx, FILE *fp)
77 {
78 struct nodelist *lp;
79 const char *s;
80
81 if (n == NULL)
82 return;
83
84 indent(ind, pfx, fp);
85 switch(n->type) {
86 case NSEMI:
87 s = "; ";
88 goto binop;
89 case NAND:
90 s = " && ";
91 goto binop;
92 case NOR:
93 s = " || ";
94 binop:
95 shtree(n->nbinary.ch1, ind, NULL, fp);
96 /* if (ind < 0) */
97 fputs(s, fp);
98 shtree(n->nbinary.ch2, ind, NULL, fp);
99 break;
100 case NCMD:
101 shcmd(n, fp);
102 if (ind >= 0)
103 putc('\n', fp);
104 break;
105 case NPIPE:
106 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
107 shcmd(lp->n, fp);
108 if (lp->next)
109 fputs(" | ", fp);
110 }
111 if (n->npipe.backgnd)
112 fputs(" &", fp);
113 if (ind >= 0)
114 putc('\n', fp);
115 break;
116 default:
117 fprintf(fp, "<node type %d>", n->type);
118 if (ind >= 0)
119 putc('\n', fp);
120 break;
121 }
122 }
123
124
125
126 static void
127 shcmd(union node *cmd, FILE *fp)
128 {
129 union node *np;
130 int first;
131 const char *s;
132 int dftfd;
133
134 first = 1;
135 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
136 if (! first)
137 putchar(' ');
138 sharg(np, fp);
139 first = 0;
140 }
141 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
142 if (! first)
143 putchar(' ');
144 switch (np->nfile.type) {
145 case NTO: s = ">"; dftfd = 1; break;
146 case NCLOBBER: s = ">|"; dftfd = 1; break;
147 case NAPPEND: s = ">>"; dftfd = 1; break;
148 case NTOFD: s = ">&"; dftfd = 1; break;
149 case NFROM: s = "<"; dftfd = 0; break;
150 case NFROMFD: s = "<&"; dftfd = 0; break;
151 case NFROMTO: s = "<>"; dftfd = 0; break;
152 default: s = "*error*"; dftfd = 0; break;
153 }
154 if (np->nfile.fd != dftfd)
155 fprintf(fp, "%d", np->nfile.fd);
156 fputs(s, fp);
157 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
158 fprintf(fp, "%d", np->ndup.dupfd);
159 } else {
160 sharg(np->nfile.fname, fp);
161 }
162 first = 0;
163 }
164 }
165
166
167
168 static void
169 sharg(union node *arg, FILE *fp)
170 {
171 char *p;
172 struct nodelist *bqlist;
173 int subtype;
174
175 if (arg->type != NARG) {
176 printf("<node type %d>\n", arg->type);
177 abort();
178 }
179 bqlist = arg->narg.backquote;
180 for (p = arg->narg.text ; *p ; p++) {
181 switch (*p) {
182 case CTLESC:
183 putc(*++p, fp);
184 break;
185 case CTLVAR:
186 putc('$', fp);
187 putc('{', fp);
188 subtype = *++p;
189 if (subtype == VSLENGTH)
190 putc('#', fp);
191
192 while (*p != '=')
193 putc(*p++, fp);
194
195 if (subtype & VSNUL)
196 putc(':', fp);
197
198 switch (subtype & VSTYPE) {
199 case VSNORMAL:
200 putc('}', fp);
201 break;
202 case VSMINUS:
203 putc('-', fp);
204 break;
205 case VSPLUS:
206 putc('+', fp);
207 break;
208 case VSQUESTION:
209 putc('?', fp);
210 break;
211 case VSASSIGN:
212 putc('=', fp);
213 break;
214 case VSTRIMLEFT:
215 putc('#', fp);
216 break;
217 case VSTRIMLEFTMAX:
218 putc('#', fp);
219 putc('#', fp);
220 break;
221 case VSTRIMRIGHT:
222 putc('%', fp);
223 break;
224 case VSTRIMRIGHTMAX:
225 putc('%', fp);
226 putc('%', fp);
227 break;
228 case VSLENGTH:
229 break;
230 default:
231 printf("<subtype %d>", subtype);
232 }
233 break;
234 case CTLENDVAR:
235 putc('}', fp);
236 break;
237 case CTLBACKQ:
238 case CTLBACKQ|CTLQUOTE:
239 putc('$', fp);
240 putc('(', fp);
241 shtree(bqlist->n, -1, NULL, fp);
242 putc(')', fp);
243 break;
244 default:
245 putc(*p, fp);
246 break;
247 }
248 }
249 }
250
251
252 static void
253 indent(int amount, char *pfx, FILE *fp)
254 {
255 int i;
256
257 for (i = 0 ; i < amount ; i++) {
258 if (pfx && i == amount - 1)
259 fputs(pfx, fp);
260 putc('\t', fp);
261 }
262 }
263 #endif
264
265
266
267 /*
268 * Debugging stuff.
269 */
270
271
272 FILE *tracefile;
273
274
275 #ifdef DEBUG
276 void
277 trputc(int c)
278 {
279 if (!debug)
280 return;
281 putc(c, tracefile);
282 }
283 #endif
284
285 void
286 trace(const char *fmt, ...)
287 {
288 #ifdef DEBUG
289 va_list va;
290
291 if (!debug)
292 return;
293 va_start(va, fmt);
294 (void) vfprintf(tracefile, fmt, va);
295 va_end(va);
296 #endif
297 }
298
299
300 #ifdef DEBUG
301 void
302 trputs(const char *s)
303 {
304 if (!debug)
305 return;
306 fputs(s, tracefile);
307 }
308
309
310 static void
311 trstring(char *s)
312 {
313 char *p;
314 char c;
315
316 if (!debug)
317 return;
318 putc('"', tracefile);
319 for (p = s ; *p ; p++) {
320 switch (*p) {
321 case '\n': c = 'n'; goto backslash;
322 case '\t': c = 't'; goto backslash;
323 case '\r': c = 'r'; goto backslash;
324 case '"': c = '"'; goto backslash;
325 case '\\': c = '\\'; goto backslash;
326 case CTLESC: c = 'e'; goto backslash;
327 case CTLVAR: c = 'v'; goto backslash;
328 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
329 case CTLBACKQ: c = 'q'; goto backslash;
330 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
331 backslash: putc('\\', tracefile);
332 putc(c, tracefile);
333 break;
334 default:
335 if (*p >= ' ' && *p <= '~')
336 putc(*p, tracefile);
337 else {
338 putc('\\', tracefile);
339 putc(*p >> 6 & 03, tracefile);
340 putc(*p >> 3 & 07, tracefile);
341 putc(*p & 07, tracefile);
342 }
343 break;
344 }
345 }
346 putc('"', tracefile);
347 }
348 #endif
349
350
351 void
352 trargs(char **ap)
353 {
354 #ifdef DEBUG
355 if (!debug)
356 return;
357 while (*ap) {
358 trstring(*ap++);
359 if (*ap)
360 putc(' ', tracefile);
361 else
362 putc('\n', tracefile);
363 }
364 #endif
365 }
366
367
368 #ifdef DEBUG
369 void
370 opentrace(void)
371 {
372 char s[100];
373 #ifdef O_APPEND
374 int flags;
375 #endif
376
377 if (!debug) {
378 if (tracefile)
379 fflush(tracefile);
380 /* leave open because libedit might be using it */
381 return;
382 }
383 #ifdef not_this_way
384 {
385 char *p;
386 if ((p = getenv("HOME")) == NULL) {
387 if (geteuid() == 0)
388 p = "/";
389 else
390 p = "/tmp";
391 }
392 scopy(p, s);
393 strcat(s, "/trace");
394 }
395 #else
396 scopy("./trace", s);
397 #endif /* not_this_way */
398 if (tracefile) {
399 if (!freopen(s, "a", tracefile)) {
400 fprintf(stderr, "Can't re-open %s\n", s);
401 debug = 0;
402 return;
403 }
404 } else {
405 if ((tracefile = fopen(s, "a")) == NULL) {
406 fprintf(stderr, "Can't open %s\n", s);
407 debug = 0;
408 return;
409 }
410 }
411 #ifdef O_APPEND
412 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
413 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
414 #endif
415 setlinebuf(tracefile);
416 fputs("\nTracing started.\n", tracefile);
417 }
418 #endif /* DEBUG */
419