test.c revision 1.16 1 /* $NetBSD: test.c,v 1.16 1997/01/09 16:44:57 tls Exp $ */
2
3 /*
4 * test(1); version 7-like -- author Erik Baalbergen
5 * modified by Eric Gisin to be used as built-in.
6 * modified by Arnold Robbins to add SVR3 compatibility
7 * (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
8 * modified by J.T. Conklin for NetBSD.
9 *
10 * This program is in the Public Domain.
11 */
12
13 #ifndef lint
14 static char rcsid[] = "$NetBSD: test.c,v 1.16 1997/01/09 16:44:57 tls Exp $";
15 #endif
16
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <unistd.h>
20 #include <ctype.h>
21 #include <errno.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <err.h>
26
27 /* test(1) accepts the following grammar:
28 oexpr ::= aexpr | aexpr "-o" oexpr ;
29 aexpr ::= nexpr | nexpr "-a" aexpr ;
30 nexpr ::= primary | "!" primary
31 primary ::= unary-operator operand
32 | operand binary-operator operand
33 | operand
34 | "(" oexpr ")"
35 ;
36 unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
37 "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
38
39 binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
40 "-nt"|"-ot"|"-ef";
41 operand ::= <any legal UNIX file name>
42 */
43
44 enum token {
45 EOI,
46 FILRD,
47 FILWR,
48 FILEX,
49 FILEXIST,
50 FILREG,
51 FILDIR,
52 FILCDEV,
53 FILBDEV,
54 FILFIFO,
55 FILSOCK,
56 FILSYM,
57 FILGZ,
58 FILTT,
59 FILSUID,
60 FILSGID,
61 FILSTCK,
62 FILNT,
63 FILOT,
64 FILEQ,
65 FILUID,
66 FILGID,
67 STREZ,
68 STRNZ,
69 STREQ,
70 STRNE,
71 STRLT,
72 STRGT,
73 INTEQ,
74 INTNE,
75 INTGE,
76 INTGT,
77 INTLE,
78 INTLT,
79 UNOT,
80 BAND,
81 BOR,
82 LPAREN,
83 RPAREN,
84 OPERAND
85 };
86
87 enum token_types {
88 UNOP,
89 BINOP,
90 BUNOP,
91 BBINOP,
92 PAREN
93 };
94
95 struct t_op {
96 const char *op_text;
97 short op_num, op_type;
98 } const ops [] = {
99 {"-r", FILRD, UNOP},
100 {"-w", FILWR, UNOP},
101 {"-x", FILEX, UNOP},
102 {"-e", FILEXIST,UNOP},
103 {"-f", FILREG, UNOP},
104 {"-d", FILDIR, UNOP},
105 {"-c", FILCDEV,UNOP},
106 {"-b", FILBDEV,UNOP},
107 {"-p", FILFIFO,UNOP},
108 {"-u", FILSUID,UNOP},
109 {"-g", FILSGID,UNOP},
110 {"-k", FILSTCK,UNOP},
111 {"-s", FILGZ, UNOP},
112 {"-t", FILTT, UNOP},
113 {"-z", STREZ, UNOP},
114 {"-n", STRNZ, UNOP},
115 {"-h", FILSYM, UNOP}, /* for backwards compat */
116 {"-O", FILUID, UNOP},
117 {"-G", FILGID, UNOP},
118 {"-L", FILSYM, UNOP},
119 {"-S", FILSOCK,UNOP},
120 {"=", STREQ, BINOP},
121 {"!=", STRNE, BINOP},
122 {"<", STRLT, BINOP},
123 {">", STRGT, BINOP},
124 {"-eq", INTEQ, BINOP},
125 {"-ne", INTNE, BINOP},
126 {"-ge", INTGE, BINOP},
127 {"-gt", INTGT, BINOP},
128 {"-le", INTLE, BINOP},
129 {"-lt", INTLT, BINOP},
130 {"-nt", FILNT, BINOP},
131 {"-ot", FILOT, BINOP},
132 {"-ef", FILEQ, BINOP},
133 {"!", UNOT, BUNOP},
134 {"-a", BAND, BBINOP},
135 {"-o", BOR, BBINOP},
136 {"(", LPAREN, PAREN},
137 {")", RPAREN, PAREN},
138 {0, 0, 0}
139 };
140
141 char **t_wp;
142 struct t_op const *t_wp_op;
143
144 static enum token t_lex();
145 static int oexpr();
146 static int aexpr();
147 static int nexpr();
148 static int binop();
149 static int primary();
150 static int filstat();
151 static int getn();
152 static int newerf();
153 static int olderf();
154 static int equalf();
155 static void syntax();
156
157 int
158 main(argc, argv)
159 int argc;
160 char **argv;
161 {
162 int res;
163
164 if (strcmp(argv[0], "[") == 0) {
165 if (strcmp(argv[--argc], "]"))
166 errx(2, "missing ]");
167 argv[argc] = NULL;
168 }
169
170 /* Implement special cases from POSIX.2, section 4.62.4 */
171 switch (argc) {
172 case 1:
173 return 1;
174 case 2:
175 return (*argv[1] == '\0');
176 case 3:
177 if (argv[1][0] == '!' && argv[1][1] == '\0') {
178 return !(*argv[2] == '\0');
179 }
180 break;
181 case 4:
182 if (argv[1][0] != '!' || argv[1][1] != '\0') {
183 if (t_lex(argv[2]),
184 t_wp_op && t_wp_op->op_type == BINOP) {
185 t_wp = &argv[1];
186 return (binop() == 0);
187 }
188 }
189 break;
190 case 5:
191 if (argv[1][0] == '!' && argv[1][1] == '\0') {
192 if (t_lex(argv[3]),
193 t_wp_op && t_wp_op->op_type == BINOP) {
194 t_wp = &argv[2];
195 return !(binop() == 0);
196 }
197 }
198 break;
199 }
200
201 t_wp = &argv[1];
202 res = !oexpr(t_lex(*t_wp));
203
204 if (*t_wp != NULL && *++t_wp != NULL)
205 syntax(*t_wp, "unknown operand");
206
207 return res;
208 }
209
210 static void
211 syntax(op, msg)
212 char *op;
213 char *msg;
214 {
215 if (op && *op)
216 errx(2, "%s: %s", op, msg);
217 else
218 errx(2, "%s", msg);
219 }
220
221 static int
222 oexpr(n)
223 enum token n;
224 {
225 int res;
226
227 res = aexpr(n);
228 if (t_lex(*++t_wp) == BOR)
229 return oexpr(t_lex(*++t_wp)) || res;
230 t_wp--;
231 return res;
232 }
233
234 static int
235 aexpr(n)
236 enum token n;
237 {
238 int res;
239
240 res = nexpr(n);
241 if (t_lex(*++t_wp) == BAND)
242 return aexpr(t_lex(*++t_wp)) && res;
243 t_wp--;
244 return res;
245 }
246
247 static int
248 nexpr(n)
249 enum token n; /* token */
250 {
251 if (n == UNOT)
252 return !nexpr(t_lex(*++t_wp));
253 return primary(n);
254 }
255
256 static int
257 primary(n)
258 enum token n;
259 {
260 int res;
261
262 if (n == EOI)
263 syntax(NULL, "argument expected");
264 if (n == LPAREN) {
265 res = oexpr(t_lex(*++t_wp));
266 if (t_lex(*++t_wp) != RPAREN)
267 syntax(NULL, "closing paren expected");
268 return res;
269 }
270 if (t_wp_op && t_wp_op->op_type == UNOP) {
271 /* unary expression */
272 if (*++t_wp == NULL)
273 syntax(t_wp_op->op_text, "argument expected");
274 switch (n) {
275 case STREZ:
276 return strlen(*t_wp) == 0;
277 case STRNZ:
278 return strlen(*t_wp) != 0;
279 case FILTT:
280 return isatty(getn(*t_wp));
281 default:
282 return filstat(*t_wp, n);
283 }
284 }
285
286 if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
287 return binop();
288 }
289
290 return strlen(*t_wp) > 0;
291 }
292
293 static int
294 binop()
295 {
296 const char *opnd1, *opnd2;
297 struct t_op const *op;
298
299 opnd1 = *t_wp;
300 (void) t_lex(*++t_wp);
301 op = t_wp_op;
302
303 if ((opnd2 = *++t_wp) == (char *)0)
304 syntax(op->op_text, "argument expected");
305
306 switch (op->op_num) {
307 case STREQ:
308 return strcmp(opnd1, opnd2) == 0;
309 case STRNE:
310 return strcmp(opnd1, opnd2) != 0;
311 case STRLT:
312 return strcmp(opnd1, opnd2) < 0;
313 case STRGT:
314 return strcmp(opnd1, opnd2) > 0;
315 case INTEQ:
316 return getn(opnd1) == getn(opnd2);
317 case INTNE:
318 return getn(opnd1) != getn(opnd2);
319 case INTGE:
320 return getn(opnd1) >= getn(opnd2);
321 case INTGT:
322 return getn(opnd1) > getn(opnd2);
323 case INTLE:
324 return getn(opnd1) <= getn(opnd2);
325 case INTLT:
326 return getn(opnd1) < getn(opnd2);
327 case FILNT:
328 return newerf (opnd1, opnd2);
329 case FILOT:
330 return olderf (opnd1, opnd2);
331 case FILEQ:
332 return equalf (opnd1, opnd2);
333 }
334 /* NOTREACHED */
335 }
336
337 static int
338 filstat(nm, mode)
339 char *nm;
340 enum token mode;
341 {
342 struct stat s;
343 int i;
344
345 if (mode == FILSYM) {
346 #ifdef S_IFLNK
347 if (lstat(nm, &s) == 0) {
348 i = S_IFLNK;
349 goto filetype;
350 }
351 #endif
352 return 0;
353 }
354
355 if (stat(nm, &s) != 0)
356 return 0;
357
358 switch (mode) {
359 case FILRD:
360 return access(nm, R_OK) == 0;
361 case FILWR:
362 return access(nm, W_OK) == 0;
363 case FILEX:
364 return access(nm, X_OK) == 0;
365 case FILEXIST:
366 return access(nm, F_OK) == 0;
367 case FILREG:
368 i = S_IFREG;
369 goto filetype;
370 case FILDIR:
371 i = S_IFDIR;
372 goto filetype;
373 case FILCDEV:
374 i = S_IFCHR;
375 goto filetype;
376 case FILBDEV:
377 i = S_IFBLK;
378 goto filetype;
379 case FILFIFO:
380 #ifdef S_IFIFO
381 i = S_IFIFO;
382 goto filetype;
383 #else
384 return 0;
385 #endif
386 case FILSOCK:
387 #ifdef S_IFSOCK
388 i = S_IFSOCK;
389 goto filetype;
390 #else
391 return 0;
392 #endif
393 case FILSUID:
394 i = S_ISUID;
395 goto filebit;
396 case FILSGID:
397 i = S_ISGID;
398 goto filebit;
399 case FILSTCK:
400 i = S_ISVTX;
401 goto filebit;
402 case FILGZ:
403 return s.st_size > 0L;
404 case FILUID:
405 return s.st_uid == geteuid();
406 case FILGID:
407 return s.st_gid == getegid();
408 default:
409 return 1;
410 }
411
412 filetype:
413 return ((s.st_mode & S_IFMT) == i);
414
415 filebit:
416 return ((s.st_mode & i) != 0);
417 }
418
419 static enum token
420 t_lex(s)
421 char *s;
422 {
423 struct t_op const *op = ops;
424
425 if (s == 0) {
426 t_wp_op = (struct t_op *)0;
427 return EOI;
428 }
429 while (op->op_text) {
430 if (strcmp(s, op->op_text) == 0) {
431 t_wp_op = op;
432 return op->op_num;
433 }
434 op++;
435 }
436 t_wp_op = (struct t_op *)0;
437 return OPERAND;
438 }
439
440 /* atoi with error detection */
441 static int
442 getn(s)
443 char *s;
444 {
445 char *p;
446 long r;
447
448 errno = 0;
449 r = strtol(s, &p, 10);
450
451 if (errno != 0)
452 errx(2, "%s: out of range", s);
453
454 while (isspace(*p))
455 p++;
456
457 if (*p)
458 errx(2, "%s: bad number", s);
459
460 return (int) r;
461 }
462
463 static int
464 newerf (f1, f2)
465 char *f1, *f2;
466 {
467 struct stat b1, b2;
468
469 return (stat (f1, &b1) == 0 &&
470 stat (f2, &b2) == 0 &&
471 b1.st_mtime > b2.st_mtime);
472 }
473
474 static int
475 olderf (f1, f2)
476 char *f1, *f2;
477 {
478 struct stat b1, b2;
479
480 return (stat (f1, &b1) == 0 &&
481 stat (f2, &b2) == 0 &&
482 b1.st_mtime < b2.st_mtime);
483 }
484
485 static int
486 equalf (f1, f2)
487 char *f1, *f2;
488 {
489 struct stat b1, b2;
490
491 return (stat (f1, &b1) == 0 &&
492 stat (f2, &b2) == 0 &&
493 b1.st_dev == b2.st_dev &&
494 b1.st_ino == b2.st_ino);
495 }
496