expand.c revision 1.6 1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifndef lint
35 /* from: static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; */
36 static char *rcsid = "$Id: expand.c,v 1.6 1996/07/12 00:06:34 thorpej Exp $";
37 #endif /* not lint */
38
39 #include "defs.h"
40
41 #define GAVSIZ NCARGS / 6
42 #define LC '{'
43 #define RC '}'
44
45 static char shchars[] = "${[*?";
46
47 int which; /* bit mask of types to expand */
48 int eargc; /* expanded arg count */
49 char **eargv; /* expanded arg vectors */
50 char *path;
51 char *pathp;
52 char *lastpathp;
53 char *tilde; /* "~user" if not expanding tilde, else "" */
54 char *tpathp;
55 int nleft;
56
57 int expany; /* any expansions done? */
58 char *entp;
59 char **sortbase;
60
61 #define sort() qsort((char *)sortbase, &eargv[eargc] - sortbase, \
62 sizeof(*sortbase), argcmp), sortbase = &eargv[eargc]
63
64 static void Cat __P((char *, char *));
65 static void addpath __P((int));
66 static int amatch __P((char *, char *));
67 static int argcmp __P((const void *, const void *));
68 static int execbrc __P((char *, char *));
69 static void expsh __P((char *));
70 static void expstr __P((char *));
71 static int match __P((char *, char *));
72 static void matchdir __P((char *));
73 static int smatch __P((char *, char *));
74
75 /*
76 * Take a list of names and expand any macros, etc.
77 * wh = E_VARS if expanding variables.
78 * wh = E_SHELL if expanding shell characters.
79 * wh = E_TILDE if expanding `~'.
80 * or any of these or'ed together.
81 *
82 * Major portions of this were snarfed from csh/sh.glob.c.
83 */
84 struct namelist *
85 expand(list, wh)
86 struct namelist *list;
87 int wh;
88 {
89 register struct namelist *nl, *prev;
90 register int n;
91 char pathbuf[BUFSIZ];
92 char *argvbuf[GAVSIZ];
93
94 if (debug) {
95 printf("expand(%x, %d)\nlist = ", list, wh);
96 prnames(list);
97 }
98
99 if (wh == 0) {
100 register char *cp;
101
102 for (nl = list; nl != NULL; nl = nl->n_next)
103 for (cp = nl->n_name; *cp; cp++)
104 *cp = *cp & TRIM;
105 return(list);
106 }
107
108 which = wh;
109 path = tpathp = pathp = pathbuf;
110 *pathp = '\0';
111 lastpathp = &path[sizeof pathbuf - 2];
112 tilde = "";
113 eargc = 0;
114 eargv = sortbase = argvbuf;
115 *eargv = 0;
116 nleft = NCARGS - 4;
117 /*
118 * Walk the name list and expand names into eargv[];
119 */
120 for (nl = list; nl != NULL; nl = nl->n_next)
121 expstr(nl->n_name);
122 /*
123 * Take expanded list of names from eargv[] and build a new list.
124 */
125 list = prev = NULL;
126 for (n = 0; n < eargc; n++) {
127 nl = makenl(NULL);
128 nl->n_name = eargv[n];
129 if (prev == NULL)
130 list = prev = nl;
131 else {
132 prev->n_next = nl;
133 prev = nl;
134 }
135 }
136 if (debug) {
137 printf("expanded list = ");
138 prnames(list);
139 }
140 return(list);
141 }
142
143 static void
144 expstr(s)
145 char *s;
146 {
147 register char *cp, *cp1;
148 register struct namelist *tp;
149 char *tail;
150 char buf[BUFSIZ];
151 int savec, oeargc;
152 extern char homedir[];
153
154 if (s == NULL || *s == '\0')
155 return;
156
157 if ((which & E_VARS) && (cp = index(s, '$')) != NULL) {
158 *cp++ = '\0';
159 if (*cp == '\0') {
160 yyerror("no variable name after '$'");
161 return;
162 }
163 if (*cp == LC) {
164 cp++;
165 if ((tail = index(cp, RC)) == NULL) {
166 yyerror("unmatched '{'");
167 return;
168 }
169 *tail++ = savec = '\0';
170 if (*cp == '\0') {
171 yyerror("no variable name after '$'");
172 return;
173 }
174 } else {
175 tail = cp + 1;
176 savec = *tail;
177 *tail = '\0';
178 }
179 tp = lookup(cp, NULL, 0);
180 if (savec != '\0')
181 *tail = savec;
182 if (tp != NULL) {
183 for (; tp != NULL; tp = tp->n_next) {
184 snprintf(buf, sizeof(buf), "%s%s%s", s,
185 tp->n_name, tail);
186 expstr(buf);
187 }
188 return;
189 }
190 snprintf(buf, sizeof(buf), "%s%s", s, tail);
191 expstr(buf);
192 return;
193 }
194 if ((which & ~E_VARS) == 0 || !strcmp(s, "{") || !strcmp(s, "{}")) {
195 Cat(s, "");
196 sort();
197 return;
198 }
199 if (*s == '~') {
200 cp = ++s;
201 if (*cp == '\0' || *cp == '/') {
202 tilde = "~";
203 cp1 = homedir;
204 } else {
205 tilde = cp1 = buf;
206 *cp1++ = '~';
207 do
208 *cp1++ = *cp++;
209 while (*cp && *cp != '/');
210 *cp1 = '\0';
211 if (pw == NULL || strcmp(pw->pw_name, buf+1) != 0) {
212 if ((pw = getpwnam(buf+1)) == NULL) {
213 strcat(buf, ": unknown user name");
214 yyerror(buf+1);
215 return;
216 }
217 }
218 cp1 = pw->pw_dir;
219 s = cp;
220 }
221 for (cp = path; *cp++ = *cp1++; )
222 ;
223 tpathp = pathp = cp - 1;
224 } else {
225 tpathp = pathp = path;
226 tilde = "";
227 }
228 *pathp = '\0';
229 if (!(which & E_SHELL)) {
230 if (which & E_TILDE)
231 Cat(path, s);
232 else
233 Cat(tilde, s);
234 sort();
235 return;
236 }
237 oeargc = eargc;
238 expany = 0;
239 expsh(s);
240 if (eargc == oeargc)
241 Cat(s, ""); /* "nonomatch" is set */
242 sort();
243 }
244
245 static int
246 argcmp(a1, a2)
247 const void *a1, *a2;
248 {
249
250 return (strcmp(*(char **)a1, *(char **)a2));
251 }
252
253 /*
254 * If there are any Shell meta characters in the name,
255 * expand into a list, after searching directory
256 */
257 static void
258 expsh(s)
259 char *s;
260 {
261 register char *cp;
262 register char *spathp, *oldcp;
263 struct stat stb;
264
265 spathp = pathp;
266 cp = s;
267 while (!any(*cp, shchars)) {
268 if (*cp == '\0') {
269 if (!expany || stat(path, &stb) >= 0) {
270 if (which & E_TILDE)
271 Cat(path, "");
272 else
273 Cat(tilde, tpathp);
274 }
275 goto endit;
276 }
277 addpath(*cp++);
278 }
279 oldcp = cp;
280 while (cp > s && *cp != '/')
281 cp--, pathp--;
282 if (*cp == '/')
283 cp++, pathp++;
284 *pathp = '\0';
285 if (*oldcp == '{') {
286 execbrc(cp, NULL);
287 return;
288 }
289 matchdir(cp);
290 endit:
291 pathp = spathp;
292 *pathp = '\0';
293 }
294
295 static void
296 matchdir(pattern)
297 char *pattern;
298 {
299 struct stat stb;
300 register struct direct *dp;
301 DIR *dirp;
302
303 dirp = opendir(path);
304 if (dirp == NULL) {
305 if (expany)
306 return;
307 goto patherr2;
308 }
309 if (fstat(dirp->dd_fd, &stb) < 0)
310 goto patherr1;
311 if (!ISDIR(stb.st_mode)) {
312 errno = ENOTDIR;
313 goto patherr1;
314 }
315 while ((dp = readdir(dirp)) != NULL)
316 if (match(dp->d_name, pattern)) {
317 if (which & E_TILDE)
318 Cat(path, dp->d_name);
319 else {
320 strcpy(pathp, dp->d_name);
321 Cat(tilde, tpathp);
322 *pathp = '\0';
323 }
324 }
325 closedir(dirp);
326 return;
327
328 patherr1:
329 closedir(dirp);
330 patherr2:
331 strcat(path, ": ");
332 strcat(path, strerror(errno));
333 yyerror(path);
334 }
335
336 static int
337 execbrc(p, s)
338 char *p, *s;
339 {
340 char restbuf[BUFSIZ + 2];
341 register char *pe, *pm, *pl;
342 int brclev = 0;
343 char *lm, savec, *spathp;
344
345 for (lm = restbuf; *p != '{'; *lm++ = *p++)
346 continue;
347 for (pe = ++p; *pe; pe++)
348 switch (*pe) {
349
350 case '{':
351 brclev++;
352 continue;
353
354 case '}':
355 if (brclev == 0)
356 goto pend;
357 brclev--;
358 continue;
359
360 case '[':
361 for (pe++; *pe && *pe != ']'; pe++)
362 continue;
363 if (!*pe)
364 yyerror("Missing ']'");
365 continue;
366 }
367 pend:
368 if (brclev || !*pe) {
369 yyerror("Missing '}'");
370 return (0);
371 }
372 for (pl = pm = p; pm <= pe; pm++)
373 switch (*pm & (QUOTE|TRIM)) {
374
375 case '{':
376 brclev++;
377 continue;
378
379 case '}':
380 if (brclev) {
381 brclev--;
382 continue;
383 }
384 goto doit;
385
386 case ',':
387 if (brclev)
388 continue;
389 doit:
390 savec = *pm;
391 *pm = 0;
392 strcpy(lm, pl);
393 strcat(restbuf, pe + 1);
394 *pm = savec;
395 if (s == 0) {
396 spathp = pathp;
397 expsh(restbuf);
398 pathp = spathp;
399 *pathp = 0;
400 } else if (amatch(s, restbuf))
401 return (1);
402 sort();
403 pl = pm + 1;
404 continue;
405
406 case '[':
407 for (pm++; *pm && *pm != ']'; pm++)
408 continue;
409 if (!*pm)
410 yyerror("Missing ']'");
411 continue;
412 }
413 return (0);
414 }
415
416 static int
417 match(s, p)
418 char *s, *p;
419 {
420 register int c;
421 register char *sentp;
422 char sexpany = expany;
423
424 if (*s == '.' && *p != '.')
425 return (0);
426 sentp = entp;
427 entp = s;
428 c = amatch(s, p);
429 entp = sentp;
430 expany = sexpany;
431 return (c);
432 }
433
434 static int
435 amatch(s, p)
436 register char *s, *p;
437 {
438 register int scc;
439 int ok, lc;
440 char *spathp;
441 struct stat stb;
442 int c, cc;
443
444 expany = 1;
445 for (;;) {
446 scc = *s++ & TRIM;
447 switch (c = *p++) {
448
449 case '{':
450 return (execbrc(p - 1, s - 1));
451
452 case '[':
453 ok = 0;
454 lc = 077777;
455 while (cc = *p++) {
456 if (cc == ']') {
457 if (ok)
458 break;
459 return (0);
460 }
461 if (cc == '-') {
462 if (lc <= scc && scc <= *p++)
463 ok++;
464 } else
465 if (scc == (lc = cc))
466 ok++;
467 }
468 if (cc == 0) {
469 yyerror("Missing ']'");
470 return (0);
471 }
472 continue;
473
474 case '*':
475 if (!*p)
476 return (1);
477 if (*p == '/') {
478 p++;
479 goto slash;
480 }
481 for (s--; *s; s++)
482 if (amatch(s, p))
483 return (1);
484 return (0);
485
486 case '\0':
487 return (scc == '\0');
488
489 default:
490 if ((c & TRIM) != scc)
491 return (0);
492 continue;
493
494 case '?':
495 if (scc == '\0')
496 return (0);
497 continue;
498
499 case '/':
500 if (scc)
501 return (0);
502 slash:
503 s = entp;
504 spathp = pathp;
505 while (*s)
506 addpath(*s++);
507 addpath('/');
508 if (stat(path, &stb) == 0 && ISDIR(stb.st_mode))
509 if (*p == '\0') {
510 if (which & E_TILDE)
511 Cat(path, "");
512 else
513 Cat(tilde, tpathp);
514 } else
515 expsh(p);
516 pathp = spathp;
517 *pathp = '\0';
518 return (0);
519 }
520 }
521 }
522
523 static int
524 smatch(s, p)
525 register char *s, *p;
526 {
527 register int scc;
528 int ok, lc;
529 int c, cc;
530
531 for (;;) {
532 scc = *s++ & TRIM;
533 switch (c = *p++) {
534
535 case '[':
536 ok = 0;
537 lc = 077777;
538 while (cc = *p++) {
539 if (cc == ']') {
540 if (ok)
541 break;
542 return (0);
543 }
544 if (cc == '-') {
545 if (lc <= scc && scc <= *p++)
546 ok++;
547 } else
548 if (scc == (lc = cc))
549 ok++;
550 }
551 if (cc == 0) {
552 yyerror("Missing ']'");
553 return (0);
554 }
555 continue;
556
557 case '*':
558 if (!*p)
559 return (1);
560 for (s--; *s; s++)
561 if (smatch(s, p))
562 return (1);
563 return (0);
564
565 case '\0':
566 return (scc == '\0');
567
568 default:
569 if ((c & TRIM) != scc)
570 return (0);
571 continue;
572
573 case '?':
574 if (scc == 0)
575 return (0);
576 continue;
577
578 }
579 }
580 }
581
582 static void
583 Cat(s1, s2)
584 register char *s1, *s2;
585 {
586 int len = strlen(s1) + strlen(s2) + 1;
587 register char *s;
588
589 nleft -= len;
590 if (nleft <= 0 || ++eargc >= GAVSIZ)
591 yyerror("Arguments too long");
592 eargv[eargc] = 0;
593 eargv[eargc - 1] = s = malloc(len);
594 if (s == NULL)
595 fatal("ran out of memory\n");
596 while (*s++ = *s1++ & TRIM)
597 ;
598 s--;
599 while (*s++ = *s2++ & TRIM)
600 ;
601 }
602
603 static void
604 addpath(c)
605 int c;
606 {
607
608 if (pathp >= lastpathp)
609 yyerror("Pathname too long");
610 else {
611 *pathp++ = c & TRIM;
612 *pathp = '\0';
613 }
614 }
615
616 /*
617 * Expand file names beginning with `~' into the
618 * user's home directory path name. Return a pointer in buf to the
619 * part corresponding to `file'.
620 */
621 char *
622 exptilde(buf, file)
623 char buf[];
624 register char *file;
625 {
626 register char *s1, *s2, *s3;
627 extern char homedir[];
628
629 if (*file != '~') {
630 strcpy(buf, file);
631 return(buf);
632 }
633 if (*++file == '\0') {
634 s2 = homedir;
635 s3 = NULL;
636 } else if (*file == '/') {
637 s2 = homedir;
638 s3 = file;
639 } else {
640 s3 = file;
641 while (*s3 && *s3 != '/')
642 s3++;
643 if (*s3 == '/')
644 *s3 = '\0';
645 else
646 s3 = NULL;
647 if (pw == NULL || strcmp(pw->pw_name, file) != 0) {
648 if ((pw = getpwnam(file)) == NULL) {
649 error("%s: unknown user name\n", file);
650 if (s3 != NULL)
651 *s3 = '/';
652 return(NULL);
653 }
654 }
655 if (s3 != NULL)
656 *s3 = '/';
657 s2 = pw->pw_dir;
658 }
659 for (s1 = buf; *s1++ = *s2++; )
660 ;
661 s2 = --s1;
662 if (s3 != NULL) {
663 s2++;
664 while (*s1++ = *s3++)
665 ;
666 }
667 return(s2);
668 }
669