test.c revision 1.30 1 /* $NetBSD: test.c,v 1.30 2006/09/24 13:24:08 hubertf 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 1.30 2006/09/24 13:24:08 hubertf Exp $");
16 #endif
17
18 #include <sys/stat.h>
19 #include <sys/types.h>
20
21 #include <ctype.h>
22 #include <err.h>
23 #include <errno.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <stdarg.h>
29
30 /* test(1) accepts the following grammar:
31 oexpr ::= aexpr | aexpr "-o" oexpr ;
32 aexpr ::= nexpr | nexpr "-a" aexpr ;
33 nexpr ::= primary | "!" primary
34 primary ::= unary-operator operand
35 | operand binary-operator operand
36 | operand
37 | "(" oexpr ")"
38 ;
39 unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
40 "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
41
42 binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
43 "-nt"|"-ot"|"-ef";
44 operand ::= <any legal UNIX file name>
45 */
46
47 enum token {
48 EOI,
49 FILRD,
50 FILWR,
51 FILEX,
52 FILEXIST,
53 FILREG,
54 FILDIR,
55 FILCDEV,
56 FILBDEV,
57 FILFIFO,
58 FILSOCK,
59 FILSYM,
60 FILGZ,
61 FILTT,
62 FILSUID,
63 FILSGID,
64 FILSTCK,
65 FILNT,
66 FILOT,
67 FILEQ,
68 FILUID,
69 FILGID,
70 STREZ,
71 STRNZ,
72 STREQ,
73 STRNE,
74 STRLT,
75 STRGT,
76 INTEQ,
77 INTNE,
78 INTGE,
79 INTGT,
80 INTLE,
81 INTLT,
82 UNOT,
83 BAND,
84 BOR,
85 LPAREN,
86 RPAREN,
87 OPERAND
88 };
89
90 enum token_types {
91 UNOP,
92 BINOP,
93 BUNOP,
94 BBINOP,
95 PAREN
96 };
97
98 static struct t_op {
99 const char *op_text;
100 short op_num, op_type;
101 } const ops [] = {
102 {"-r", FILRD, UNOP},
103 {"-w", FILWR, UNOP},
104 {"-x", FILEX, UNOP},
105 {"-e", FILEXIST,UNOP},
106 {"-f", FILREG, UNOP},
107 {"-d", FILDIR, UNOP},
108 {"-c", FILCDEV,UNOP},
109 {"-b", FILBDEV,UNOP},
110 {"-p", FILFIFO,UNOP},
111 {"-u", FILSUID,UNOP},
112 {"-g", FILSGID,UNOP},
113 {"-k", FILSTCK,UNOP},
114 {"-s", FILGZ, UNOP},
115 {"-t", FILTT, UNOP},
116 {"-z", STREZ, UNOP},
117 {"-n", STRNZ, UNOP},
118 {"-h", FILSYM, UNOP}, /* for backwards compat */
119 {"-O", FILUID, UNOP},
120 {"-G", FILGID, UNOP},
121 {"-L", FILSYM, UNOP},
122 {"-S", FILSOCK,UNOP},
123 {"=", STREQ, BINOP},
124 {"!=", STRNE, BINOP},
125 {"<", STRLT, BINOP},
126 {">", STRGT, BINOP},
127 {"-eq", INTEQ, BINOP},
128 {"-ne", INTNE, BINOP},
129 {"-ge", INTGE, BINOP},
130 {"-gt", INTGT, BINOP},
131 {"-le", INTLE, BINOP},
132 {"-lt", INTLT, BINOP},
133 {"-nt", FILNT, BINOP},
134 {"-ot", FILOT, BINOP},
135 {"-ef", FILEQ, BINOP},
136 {"!", UNOT, BUNOP},
137 {"-a", BAND, BBINOP},
138 {"-o", BOR, BBINOP},
139 {"(", LPAREN, PAREN},
140 {")", RPAREN, PAREN},
141 {0, 0, 0}
142 };
143
144 static char **t_wp;
145 static struct t_op const *t_wp_op;
146
147 static void syntax(const char *, const char *);
148 static int oexpr(enum token);
149 static int aexpr(enum token);
150 static int nexpr(enum token);
151 static int primary(enum token);
152 static int binop(void);
153 static int filstat(char *, enum token);
154 static enum token t_lex(char *);
155 static int isoperand(void);
156 static int getn(const char *);
157 static int newerf(const char *, const char *);
158 static int olderf(const char *, const char *);
159 static int equalf(const char *, const char *);
160
161 #if defined(SHELL)
162 extern void error(const char *, ...) __attribute__((__noreturn__));
163 #else
164 static void error(const char *, ...) __attribute__((__noreturn__));
165
166 static void
167 error(const char *msg, ...)
168 {
169 va_list ap;
170
171 va_start(ap, msg);
172 verrx(2, msg, ap);
173 /*NOTREACHED*/
174 va_end(ap);
175 }
176 #endif
177
178 #ifdef SHELL
179 int testcmd(int, char **);
180
181 int
182 testcmd(int argc, char **argv)
183 #else
184 int main(int, char *[]);
185
186 int
187 main(int argc, char *argv[])
188 #endif
189 {
190 int res;
191 const char *argv0;
192
193 #ifdef SHELL
194 argv0 = argv[0];
195 #else
196 setprogname(argv[0]);
197 argv0 = getprogname();
198 #endif
199 if (strcmp(argv0, "[") == 0) {
200 if (strcmp(argv[--argc], "]"))
201 error("missing ]");
202 argv[argc] = NULL;
203 }
204
205 if (argc < 2)
206 return 1;
207
208 t_wp = &argv[1];
209 res = !oexpr(t_lex(*t_wp));
210
211 if (*t_wp != NULL && *++t_wp != NULL)
212 syntax(*t_wp, "unexpected operator");
213
214 return res;
215 }
216
217 static void
218 syntax(const char *op, const char *msg)
219 {
220
221 if (op && *op)
222 error("%s: %s", op, msg);
223 else
224 error("%s", msg);
225 }
226
227 static int
228 oexpr(enum token n)
229 {
230 int res;
231
232 res = aexpr(n);
233 if (t_lex(*++t_wp) == BOR)
234 return oexpr(t_lex(*++t_wp)) || res;
235 t_wp--;
236 return res;
237 }
238
239 static int
240 aexpr(enum token n)
241 {
242 int res;
243
244 res = nexpr(n);
245 if (t_lex(*++t_wp) == BAND)
246 return aexpr(t_lex(*++t_wp)) && res;
247 t_wp--;
248 return res;
249 }
250
251 static int
252 nexpr(enum token n)
253 {
254
255 if (n == UNOT)
256 return !nexpr(t_lex(*++t_wp));
257 return primary(n);
258 }
259
260 static int
261 primary(enum token n)
262 {
263 enum token nn;
264 int res;
265
266 if (n == EOI)
267 return 0; /* missing expression */
268 if (n == LPAREN) {
269 if ((nn = t_lex(*++t_wp)) == RPAREN)
270 return 0; /* missing expression */
271 res = oexpr(nn);
272 if (t_lex(*++t_wp) != RPAREN)
273 syntax(NULL, "closing paren expected");
274 return res;
275 }
276 if (t_wp_op && t_wp_op->op_type == UNOP) {
277 /* unary expression */
278 if (*++t_wp == NULL)
279 syntax(t_wp_op->op_text, "argument expected");
280 switch (n) {
281 case STREZ:
282 return strlen(*t_wp) == 0;
283 case STRNZ:
284 return strlen(*t_wp) != 0;
285 case FILTT:
286 return isatty(getn(*t_wp));
287 default:
288 return filstat(*t_wp, n);
289 }
290 }
291
292 if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
293 return binop();
294 }
295
296 return strlen(*t_wp) > 0;
297 }
298
299 static int
300 binop(void)
301 {
302 const char *opnd1, *opnd2;
303 struct t_op const *op;
304
305 opnd1 = *t_wp;
306 (void) t_lex(*++t_wp);
307 op = t_wp_op;
308
309 if ((opnd2 = *++t_wp) == NULL)
310 syntax(op->op_text, "argument expected");
311
312 switch (op->op_num) {
313 case STREQ:
314 return strcmp(opnd1, opnd2) == 0;
315 case STRNE:
316 return strcmp(opnd1, opnd2) != 0;
317 case STRLT:
318 return strcmp(opnd1, opnd2) < 0;
319 case STRGT:
320 return strcmp(opnd1, opnd2) > 0;
321 case INTEQ:
322 return getn(opnd1) == getn(opnd2);
323 case INTNE:
324 return getn(opnd1) != getn(opnd2);
325 case INTGE:
326 return getn(opnd1) >= getn(opnd2);
327 case INTGT:
328 return getn(opnd1) > getn(opnd2);
329 case INTLE:
330 return getn(opnd1) <= getn(opnd2);
331 case INTLT:
332 return getn(opnd1) < getn(opnd2);
333 case FILNT:
334 return newerf(opnd1, opnd2);
335 case FILOT:
336 return olderf(opnd1, opnd2);
337 case FILEQ:
338 return equalf(opnd1, opnd2);
339 default:
340 abort();
341 /* NOTREACHED */
342 }
343 }
344
345 static int
346 filstat(char *nm, enum token mode)
347 {
348 struct stat s;
349
350 if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
351 return 0;
352
353 switch (mode) {
354 case FILRD:
355 return access(nm, R_OK) == 0;
356 case FILWR:
357 return access(nm, W_OK) == 0;
358 case FILEX:
359 return access(nm, X_OK) == 0;
360 case FILEXIST:
361 return access(nm, F_OK) == 0;
362 case FILREG:
363 return S_ISREG(s.st_mode);
364 case FILDIR:
365 return S_ISDIR(s.st_mode);
366 case FILCDEV:
367 return S_ISCHR(s.st_mode);
368 case FILBDEV:
369 return S_ISBLK(s.st_mode);
370 case FILFIFO:
371 return S_ISFIFO(s.st_mode);
372 case FILSOCK:
373 return S_ISSOCK(s.st_mode);
374 case FILSYM:
375 return S_ISLNK(s.st_mode);
376 case FILSUID:
377 return (s.st_mode & S_ISUID) != 0;
378 case FILSGID:
379 return (s.st_mode & S_ISGID) != 0;
380 case FILSTCK:
381 return (s.st_mode & S_ISVTX) != 0;
382 case FILGZ:
383 return s.st_size > (off_t)0;
384 case FILUID:
385 return s.st_uid == geteuid();
386 case FILGID:
387 return s.st_gid == getegid();
388 default:
389 return 1;
390 }
391 }
392
393 static enum token
394 t_lex(char *s)
395 {
396 struct t_op const *op;
397
398 op = ops;
399
400 if (s == 0) {
401 t_wp_op = NULL;
402 return EOI;
403 }
404 while (op->op_text) {
405 if (strcmp(s, op->op_text) == 0) {
406 if ((op->op_type == UNOP && isoperand()) ||
407 (op->op_num == LPAREN && *(t_wp+1) == 0))
408 break;
409 t_wp_op = op;
410 return op->op_num;
411 }
412 op++;
413 }
414 t_wp_op = NULL;
415 return OPERAND;
416 }
417
418 static int
419 isoperand(void)
420 {
421 struct t_op const *op;
422 char *s, *t;
423
424 op = ops;
425 if ((s = *(t_wp+1)) == 0)
426 return 1;
427 if ((t = *(t_wp+2)) == 0)
428 return 0;
429 while (op->op_text) {
430 if (strcmp(s, op->op_text) == 0)
431 return op->op_type == BINOP &&
432 (t[0] != ')' || t[1] != '\0');
433 op++;
434 }
435 return 0;
436 }
437
438 /* atoi with error detection */
439 static int
440 getn(const char *s)
441 {
442 char *p;
443 long r;
444
445 errno = 0;
446 r = strtol(s, &p, 10);
447
448 if (errno != 0)
449 error("%s: out of range", s);
450
451 while (isspace((unsigned char)*p))
452 p++;
453
454 if (*p)
455 error("%s: bad number", s);
456
457 return (int) r;
458 }
459
460 static int
461 newerf(const char *f1, const char *f2)
462 {
463 struct stat b1, b2;
464
465 return (stat(f1, &b1) == 0 &&
466 stat(f2, &b2) == 0 &&
467 b1.st_mtime > b2.st_mtime);
468 }
469
470 static int
471 olderf(const char *f1, const char *f2)
472 {
473 struct stat b1, b2;
474
475 return (stat(f1, &b1) == 0 &&
476 stat(f2, &b2) == 0 &&
477 b1.st_mtime < b2.st_mtime);
478 }
479
480 static int
481 equalf(const char *f1, const char *f2)
482 {
483 struct stat b1, b2;
484
485 return (stat(f1, &b1) == 0 &&
486 stat(f2, &b2) == 0 &&
487 b1.st_dev == b2.st_dev &&
488 b1.st_ino == b2.st_ino);
489 }
490