test.c revision 1.21 1 /* $NetBSD: test.c,v 1.21 1999/04/05 09:48:38 kleink 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 #include <sys/cdefs.h>
14 #ifndef lint
15 __RCSID("$NetBSD: test.c,v 1.21 1999/04/05 09:48:38 kleink Exp $");
16 #endif
17
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <unistd.h>
21 #include <ctype.h>
22 #include <errno.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <err.h>
27
28 /* test(1) accepts the following grammar:
29 oexpr ::= aexpr | aexpr "-o" oexpr ;
30 aexpr ::= nexpr | nexpr "-a" aexpr ;
31 nexpr ::= primary | "!" primary
32 primary ::= unary-operator operand
33 | operand binary-operator operand
34 | operand
35 | "(" oexpr ")"
36 ;
37 unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
38 "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
39
40 binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
41 "-nt"|"-ot"|"-ef";
42 operand ::= <any legal UNIX file name>
43 */
44
45 enum token {
46 EOI,
47 FILRD,
48 FILWR,
49 FILEX,
50 FILEXIST,
51 FILREG,
52 FILDIR,
53 FILCDEV,
54 FILBDEV,
55 FILFIFO,
56 FILSOCK,
57 FILSYM,
58 FILGZ,
59 FILTT,
60 FILSUID,
61 FILSGID,
62 FILSTCK,
63 FILNT,
64 FILOT,
65 FILEQ,
66 FILUID,
67 FILGID,
68 STREZ,
69 STRNZ,
70 STREQ,
71 STRNE,
72 STRLT,
73 STRGT,
74 INTEQ,
75 INTNE,
76 INTGE,
77 INTGT,
78 INTLE,
79 INTLT,
80 UNOT,
81 BAND,
82 BOR,
83 LPAREN,
84 RPAREN,
85 OPERAND
86 };
87
88 enum token_types {
89 UNOP,
90 BINOP,
91 BUNOP,
92 BBINOP,
93 PAREN
94 };
95
96 struct t_op {
97 const char *op_text;
98 short op_num, op_type;
99 } const ops [] = {
100 {"-r", FILRD, UNOP},
101 {"-w", FILWR, UNOP},
102 {"-x", FILEX, UNOP},
103 {"-e", FILEXIST,UNOP},
104 {"-f", FILREG, UNOP},
105 {"-d", FILDIR, UNOP},
106 {"-c", FILCDEV,UNOP},
107 {"-b", FILBDEV,UNOP},
108 {"-p", FILFIFO,UNOP},
109 {"-u", FILSUID,UNOP},
110 {"-g", FILSGID,UNOP},
111 {"-k", FILSTCK,UNOP},
112 {"-s", FILGZ, UNOP},
113 {"-t", FILTT, UNOP},
114 {"-z", STREZ, UNOP},
115 {"-n", STRNZ, UNOP},
116 {"-h", FILSYM, UNOP}, /* for backwards compat */
117 {"-O", FILUID, UNOP},
118 {"-G", FILGID, UNOP},
119 {"-L", FILSYM, UNOP},
120 {"-S", FILSOCK,UNOP},
121 {"=", STREQ, BINOP},
122 {"!=", STRNE, BINOP},
123 {"<", STRLT, BINOP},
124 {">", STRGT, BINOP},
125 {"-eq", INTEQ, BINOP},
126 {"-ne", INTNE, BINOP},
127 {"-ge", INTGE, BINOP},
128 {"-gt", INTGT, BINOP},
129 {"-le", INTLE, BINOP},
130 {"-lt", INTLT, BINOP},
131 {"-nt", FILNT, BINOP},
132 {"-ot", FILOT, BINOP},
133 {"-ef", FILEQ, BINOP},
134 {"!", UNOT, BUNOP},
135 {"-a", BAND, BBINOP},
136 {"-o", BOR, BBINOP},
137 {"(", LPAREN, PAREN},
138 {")", RPAREN, PAREN},
139 {0, 0, 0}
140 };
141
142 char **t_wp;
143 struct t_op const *t_wp_op;
144
145 static void syntax __P((const char *, const char *));
146 static int oexpr __P((enum token));
147 static int aexpr __P((enum token));
148 static int nexpr __P((enum token));
149 static int primary __P((enum token));
150 static int binop __P((void));
151 static int filstat __P((char *, enum token));
152 static enum token t_lex __P((char *));
153 static int isoperand __P((void));
154 static int getn __P((const char *));
155 static int newerf __P((const char *, const char *));
156 static int olderf __P((const char *, const char *));
157 static int equalf __P((const char *, const char *));
158
159 int main __P((int, char **));
160
161 int
162 main(argc, argv)
163 int argc;
164 char **argv;
165 {
166 int res;
167
168 if (strcmp(argv[0], "[") == 0) {
169 if (strcmp(argv[--argc], "]"))
170 errx(2, "missing ]");
171 argv[argc] = NULL;
172 }
173
174 t_wp = &argv[1];
175 res = !oexpr(t_lex(*t_wp));
176
177 if (*t_wp != NULL && *++t_wp != NULL)
178 syntax(*t_wp, "unexpected operator");
179
180 return res;
181 }
182
183 static void
184 syntax(op, msg)
185 const char *op;
186 const char *msg;
187 {
188 if (op && *op)
189 errx(2, "%s: %s", op, msg);
190 else
191 errx(2, "%s", msg);
192 }
193
194 static int
195 oexpr(n)
196 enum token n;
197 {
198 int res;
199
200 res = aexpr(n);
201 if (t_lex(*++t_wp) == BOR)
202 return oexpr(t_lex(*++t_wp)) || res;
203 t_wp--;
204 return res;
205 }
206
207 static int
208 aexpr(n)
209 enum token n;
210 {
211 int res;
212
213 res = nexpr(n);
214 if (t_lex(*++t_wp) == BAND)
215 return aexpr(t_lex(*++t_wp)) && res;
216 t_wp--;
217 return res;
218 }
219
220 static int
221 nexpr(n)
222 enum token n; /* token */
223 {
224 if (n == UNOT)
225 return !nexpr(t_lex(*++t_wp));
226 return primary(n);
227 }
228
229 static int
230 primary(n)
231 enum token n;
232 {
233 enum token nn;
234 int res;
235
236 if (n == EOI)
237 return 0; /* missing expression */
238 if (n == LPAREN) {
239 if ((nn = t_lex(*++t_wp)) == RPAREN)
240 return 0; /* missing expression */
241 res = oexpr(nn);
242 if (t_lex(*++t_wp) != RPAREN)
243 syntax(NULL, "closing paren expected");
244 return res;
245 }
246 if (t_wp_op && t_wp_op->op_type == UNOP) {
247 /* unary expression */
248 if (*++t_wp == NULL)
249 syntax(t_wp_op->op_text, "argument expected");
250 switch (n) {
251 case STREZ:
252 return strlen(*t_wp) == 0;
253 case STRNZ:
254 return strlen(*t_wp) != 0;
255 case FILTT:
256 return isatty(getn(*t_wp));
257 default:
258 return filstat(*t_wp, n);
259 }
260 }
261
262 if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
263 return binop();
264 }
265
266 return strlen(*t_wp) > 0;
267 }
268
269 static int
270 binop()
271 {
272 const char *opnd1, *opnd2;
273 struct t_op const *op;
274
275 opnd1 = *t_wp;
276 (void) t_lex(*++t_wp);
277 op = t_wp_op;
278
279 if ((opnd2 = *++t_wp) == (char *)0)
280 syntax(op->op_text, "argument expected");
281
282 switch (op->op_num) {
283 case STREQ:
284 return strcmp(opnd1, opnd2) == 0;
285 case STRNE:
286 return strcmp(opnd1, opnd2) != 0;
287 case STRLT:
288 return strcmp(opnd1, opnd2) < 0;
289 case STRGT:
290 return strcmp(opnd1, opnd2) > 0;
291 case INTEQ:
292 return getn(opnd1) == getn(opnd2);
293 case INTNE:
294 return getn(opnd1) != getn(opnd2);
295 case INTGE:
296 return getn(opnd1) >= getn(opnd2);
297 case INTGT:
298 return getn(opnd1) > getn(opnd2);
299 case INTLE:
300 return getn(opnd1) <= getn(opnd2);
301 case INTLT:
302 return getn(opnd1) < getn(opnd2);
303 case FILNT:
304 return newerf (opnd1, opnd2);
305 case FILOT:
306 return olderf (opnd1, opnd2);
307 case FILEQ:
308 return equalf (opnd1, opnd2);
309 default:
310 abort();
311 /* NOTREACHED */
312 }
313 }
314
315 static int
316 filstat(nm, mode)
317 char *nm;
318 enum token mode;
319 {
320 struct stat s;
321
322 if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
323 return 0;
324
325 switch (mode) {
326 case FILRD:
327 return access(nm, R_OK) == 0;
328 case FILWR:
329 return access(nm, W_OK) == 0;
330 case FILEX:
331 return access(nm, X_OK) == 0;
332 case FILEXIST:
333 return access(nm, F_OK) == 0;
334 case FILREG:
335 return S_ISREG(s.st_mode);
336 case FILDIR:
337 return S_ISDIR(s.st_mode);
338 case FILCDEV:
339 return S_ISCHR(s.st_mode);
340 case FILBDEV:
341 return S_ISBLK(s.st_mode);
342 case FILFIFO:
343 return S_ISFIFO(s.st_mode);
344 case FILSOCK:
345 return S_ISSOCK(s.st_mode);
346 case FILSYM:
347 return S_ISLNK(s.st_mode);
348 case FILSUID:
349 return (s.st_mode & S_ISUID) != 0;
350 case FILSGID:
351 return (s.st_mode & S_ISGID) != 0;
352 case FILSTCK:
353 return (s.st_mode & S_ISVTX) != 0;
354 case FILGZ:
355 return s.st_size > (off_t)0;
356 case FILUID:
357 return s.st_uid == geteuid();
358 case FILGID:
359 return s.st_gid == getegid();
360 default:
361 return 1;
362 }
363 }
364
365 static enum token
366 t_lex(s)
367 char *s;
368 {
369 struct t_op const *op = ops;
370
371 if (s == 0) {
372 t_wp_op = (struct t_op *)0;
373 return EOI;
374 }
375 while (op->op_text) {
376 if (strcmp(s, op->op_text) == 0) {
377 if ((op->op_type == UNOP && isoperand()) ||
378 (op->op_num == LPAREN && *(t_wp+1) == 0))
379 break;
380 t_wp_op = op;
381 return op->op_num;
382 }
383 op++;
384 }
385 t_wp_op = (struct t_op *)0;
386 return OPERAND;
387 }
388
389 static int
390 isoperand()
391 {
392 struct t_op const *op = ops;
393 char *s;
394 char *t;
395
396 if ((s = *(t_wp+1)) == 0)
397 return 1;
398 if ((t = *(t_wp+2)) == 0)
399 return 0;
400 while (op->op_text) {
401 if (strcmp(s, op->op_text) == 0)
402 return op->op_type == BINOP &&
403 (t[0] != ')' || t[1] != '\0');
404 op++;
405 }
406 return 0;
407 }
408
409 /* atoi with error detection */
410 static int
411 getn(s)
412 const char *s;
413 {
414 char *p;
415 long r;
416
417 errno = 0;
418 r = strtol(s, &p, 10);
419
420 if (errno != 0)
421 errx(2, "%s: out of range", s);
422
423 while (isspace((unsigned char)*p))
424 p++;
425
426 if (*p)
427 errx(2, "%s: bad number", s);
428
429 return (int) r;
430 }
431
432 static int
433 newerf (f1, f2)
434 const char *f1, *f2;
435 {
436 struct stat b1, b2;
437
438 return (stat (f1, &b1) == 0 &&
439 stat (f2, &b2) == 0 &&
440 b1.st_mtime > b2.st_mtime);
441 }
442
443 static int
444 olderf (f1, f2)
445 const char *f1, *f2;
446 {
447 struct stat b1, b2;
448
449 return (stat (f1, &b1) == 0 &&
450 stat (f2, &b2) == 0 &&
451 b1.st_mtime < b2.st_mtime);
452 }
453
454 static int
455 equalf (f1, f2)
456 const char *f1, *f2;
457 {
458 struct stat b1, b2;
459
460 return (stat (f1, &b1) == 0 &&
461 stat (f2, &b2) == 0 &&
462 b1.st_dev == b2.st_dev &&
463 b1.st_ino == b2.st_ino);
464 }
465