test.c revision 1.25 1 /* $NetBSD: test.c,v 1.25 2002/05/25 23:12:16 wiz 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 1.25 2002/05/25 23:12:16 wiz 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
192 setprogname(argv[0]);
193 if (strcmp(argv[0], "[") == 0) {
194 if (strcmp(argv[--argc], "]"))
195 error("missing ]");
196 argv[argc] = NULL;
197 }
198
199 if (argc < 2)
200 return 1;
201
202 t_wp = &argv[1];
203 res = !oexpr(t_lex(*t_wp));
204
205 if (*t_wp != NULL && *++t_wp != NULL)
206 syntax(*t_wp, "unexpected operator");
207
208 return res;
209 }
210
211 static void
212 syntax(const char *op, const char *msg)
213 {
214 if (op && *op)
215 error("%s: %s", op, msg);
216 else
217 error("%s", msg);
218 }
219
220 static int
221 oexpr(enum token n)
222 {
223 int res;
224
225 res = aexpr(n);
226 if (t_lex(*++t_wp) == BOR)
227 return oexpr(t_lex(*++t_wp)) || res;
228 t_wp--;
229 return res;
230 }
231
232 static int
233 aexpr(enum token n)
234 {
235 int res;
236
237 res = nexpr(n);
238 if (t_lex(*++t_wp) == BAND)
239 return aexpr(t_lex(*++t_wp)) && res;
240 t_wp--;
241 return res;
242 }
243
244 static int
245 nexpr(enum token n)
246 {
247 if (n == UNOT)
248 return !nexpr(t_lex(*++t_wp));
249 return primary(n);
250 }
251
252 static int
253 primary(enum token n)
254 {
255 enum token nn;
256 int res;
257
258 if (n == EOI)
259 return 0; /* missing expression */
260 if (n == LPAREN) {
261 if ((nn = t_lex(*++t_wp)) == RPAREN)
262 return 0; /* missing expression */
263 res = oexpr(nn);
264 if (t_lex(*++t_wp) != RPAREN)
265 syntax(NULL, "closing paren expected");
266 return res;
267 }
268 if (t_wp_op && t_wp_op->op_type == UNOP) {
269 /* unary expression */
270 if (*++t_wp == NULL)
271 syntax(t_wp_op->op_text, "argument expected");
272 switch (n) {
273 case STREZ:
274 return strlen(*t_wp) == 0;
275 case STRNZ:
276 return strlen(*t_wp) != 0;
277 case FILTT:
278 return isatty(getn(*t_wp));
279 default:
280 return filstat(*t_wp, n);
281 }
282 }
283
284 if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
285 return binop();
286 }
287
288 return strlen(*t_wp) > 0;
289 }
290
291 static int
292 binop(void)
293 {
294 const char *opnd1, *opnd2;
295 struct t_op const *op;
296
297 opnd1 = *t_wp;
298 (void) t_lex(*++t_wp);
299 op = t_wp_op;
300
301 if ((opnd2 = *++t_wp) == (char *)0)
302 syntax(op->op_text, "argument expected");
303
304 switch (op->op_num) {
305 case STREQ:
306 return strcmp(opnd1, opnd2) == 0;
307 case STRNE:
308 return strcmp(opnd1, opnd2) != 0;
309 case STRLT:
310 return strcmp(opnd1, opnd2) < 0;
311 case STRGT:
312 return strcmp(opnd1, opnd2) > 0;
313 case INTEQ:
314 return getn(opnd1) == getn(opnd2);
315 case INTNE:
316 return getn(opnd1) != getn(opnd2);
317 case INTGE:
318 return getn(opnd1) >= getn(opnd2);
319 case INTGT:
320 return getn(opnd1) > getn(opnd2);
321 case INTLE:
322 return getn(opnd1) <= getn(opnd2);
323 case INTLT:
324 return getn(opnd1) < getn(opnd2);
325 case FILNT:
326 return newerf (opnd1, opnd2);
327 case FILOT:
328 return olderf (opnd1, opnd2);
329 case FILEQ:
330 return equalf (opnd1, opnd2);
331 default:
332 abort();
333 /* NOTREACHED */
334 }
335 }
336
337 static int
338 filstat(char *nm, enum token mode)
339 {
340 struct stat s;
341
342 if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
343 return 0;
344
345 switch (mode) {
346 case FILRD:
347 return access(nm, R_OK) == 0;
348 case FILWR:
349 return access(nm, W_OK) == 0;
350 case FILEX:
351 return access(nm, X_OK) == 0;
352 case FILEXIST:
353 return access(nm, F_OK) == 0;
354 case FILREG:
355 return S_ISREG(s.st_mode);
356 case FILDIR:
357 return S_ISDIR(s.st_mode);
358 case FILCDEV:
359 return S_ISCHR(s.st_mode);
360 case FILBDEV:
361 return S_ISBLK(s.st_mode);
362 case FILFIFO:
363 return S_ISFIFO(s.st_mode);
364 case FILSOCK:
365 return S_ISSOCK(s.st_mode);
366 case FILSYM:
367 return S_ISLNK(s.st_mode);
368 case FILSUID:
369 return (s.st_mode & S_ISUID) != 0;
370 case FILSGID:
371 return (s.st_mode & S_ISGID) != 0;
372 case FILSTCK:
373 return (s.st_mode & S_ISVTX) != 0;
374 case FILGZ:
375 return s.st_size > (off_t)0;
376 case FILUID:
377 return s.st_uid == geteuid();
378 case FILGID:
379 return s.st_gid == getegid();
380 default:
381 return 1;
382 }
383 }
384
385 static enum token
386 t_lex(char *s)
387 {
388 struct t_op const *op;
389
390 op = ops;
391
392 if (s == 0) {
393 t_wp_op = (struct t_op *)0;
394 return EOI;
395 }
396 while (op->op_text) {
397 if (strcmp(s, op->op_text) == 0) {
398 if ((op->op_type == UNOP && isoperand()) ||
399 (op->op_num == LPAREN && *(t_wp+1) == 0))
400 break;
401 t_wp_op = op;
402 return op->op_num;
403 }
404 op++;
405 }
406 t_wp_op = (struct t_op *)0;
407 return OPERAND;
408 }
409
410 static int
411 isoperand(void)
412 {
413 struct t_op const *op;
414 char *s, *t;
415
416 op = ops;
417 if ((s = *(t_wp+1)) == 0)
418 return 1;
419 if ((t = *(t_wp+2)) == 0)
420 return 0;
421 while (op->op_text) {
422 if (strcmp(s, op->op_text) == 0)
423 return op->op_type == BINOP &&
424 (t[0] != ')' || t[1] != '\0');
425 op++;
426 }
427 return 0;
428 }
429
430 /* atoi with error detection */
431 static int
432 getn(const char *s)
433 {
434 char *p;
435 long r;
436
437 errno = 0;
438 r = strtol(s, &p, 10);
439
440 if (errno != 0)
441 error("%s: out of range", s);
442
443 while (isspace((unsigned char)*p))
444 p++;
445
446 if (*p)
447 error("%s: bad number", s);
448
449 return (int) r;
450 }
451
452 static int
453 newerf (const char *f1, const char *f2)
454 {
455 struct stat b1, b2;
456
457 return (stat (f1, &b1) == 0 &&
458 stat (f2, &b2) == 0 &&
459 b1.st_mtime > b2.st_mtime);
460 }
461
462 static int
463 olderf (const char *f1, const char *f2)
464 {
465 struct stat b1, b2;
466
467 return (stat (f1, &b1) == 0 &&
468 stat (f2, &b2) == 0 &&
469 b1.st_mtime < b2.st_mtime);
470 }
471
472 static int
473 equalf (const char *f1, const char *f2)
474 {
475 struct stat b1, b2;
476
477 return (stat (f1, &b1) == 0 &&
478 stat (f2, &b2) == 0 &&
479 b1.st_dev == b2.st_dev &&
480 b1.st_ino == b2.st_ino);
481 }
482