1 /* $NetBSD: test.c,v 1.26 2005/02/10 06:56:55 simonb 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 1.26 2005/02/10 06:56:55 simonb 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 { 214 215 if (op && *op) 216 error("%s: %s", op, msg); 217 else 218 error("%s", msg); 219 } 220 221 static int 222 oexpr(enum token n) 223 { 224 int res; 225 226 res = aexpr(n); 227 if (t_lex(*++t_wp) == BOR) 228 return oexpr(t_lex(*++t_wp)) || res; 229 t_wp--; 230 return res; 231 } 232 233 static int 234 aexpr(enum token n) 235 { 236 int res; 237 238 res = nexpr(n); 239 if (t_lex(*++t_wp) == BAND) 240 return aexpr(t_lex(*++t_wp)) && res; 241 t_wp--; 242 return res; 243 } 244 245 static int 246 nexpr(enum token n) 247 { 248 249 if (n == UNOT) 250 return !nexpr(t_lex(*++t_wp)); 251 return primary(n); 252 } 253 254 static int 255 primary(enum token n) 256 { 257 enum token nn; 258 int res; 259 260 if (n == EOI) 261 return 0; /* missing expression */ 262 if (n == LPAREN) { 263 if ((nn = t_lex(*++t_wp)) == RPAREN) 264 return 0; /* missing expression */ 265 res = oexpr(nn); 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(void) 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) == NULL) 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 default: 334 abort(); 335 /* NOTREACHED */ 336 } 337 } 338 339 static int 340 filstat(char *nm, enum token mode) 341 { 342 struct stat s; 343 344 if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s)) 345 return 0; 346 347 switch (mode) { 348 case FILRD: 349 return access(nm, R_OK) == 0; 350 case FILWR: 351 return access(nm, W_OK) == 0; 352 case FILEX: 353 return access(nm, X_OK) == 0; 354 case FILEXIST: 355 return access(nm, F_OK) == 0; 356 case FILREG: 357 return S_ISREG(s.st_mode); 358 case FILDIR: 359 return S_ISDIR(s.st_mode); 360 case FILCDEV: 361 return S_ISCHR(s.st_mode); 362 case FILBDEV: 363 return S_ISBLK(s.st_mode); 364 case FILFIFO: 365 return S_ISFIFO(s.st_mode); 366 case FILSOCK: 367 return S_ISSOCK(s.st_mode); 368 case FILSYM: 369 return S_ISLNK(s.st_mode); 370 case FILSUID: 371 return (s.st_mode & S_ISUID) != 0; 372 case FILSGID: 373 return (s.st_mode & S_ISGID) != 0; 374 case FILSTCK: 375 return (s.st_mode & S_ISVTX) != 0; 376 case FILGZ: 377 return s.st_size > (off_t)0; 378 case FILUID: 379 return s.st_uid == geteuid(); 380 case FILGID: 381 return s.st_gid == getegid(); 382 default: 383 return 1; 384 } 385 } 386 387 static enum token 388 t_lex(char *s) 389 { 390 struct t_op const *op; 391 392 op = ops; 393 394 if (s == 0) { 395 t_wp_op = NULL; 396 return EOI; 397 } 398 while (op->op_text) { 399 if (strcmp(s, op->op_text) == 0) { 400 if ((op->op_type == UNOP && isoperand()) || 401 (op->op_num == LPAREN && *(t_wp+1) == 0)) 402 break; 403 t_wp_op = op; 404 return op->op_num; 405 } 406 op++; 407 } 408 t_wp_op = NULL; 409 return OPERAND; 410 } 411 412 static int 413 isoperand(void) 414 { 415 struct t_op const *op; 416 char *s, *t; 417 418 op = ops; 419 if ((s = *(t_wp+1)) == 0) 420 return 1; 421 if ((t = *(t_wp+2)) == 0) 422 return 0; 423 while (op->op_text) { 424 if (strcmp(s, op->op_text) == 0) 425 return op->op_type == BINOP && 426 (t[0] != ')' || t[1] != '\0'); 427 op++; 428 } 429 return 0; 430 } 431 432 /* atoi with error detection */ 433 static int 434 getn(const char *s) 435 { 436 char *p; 437 long r; 438 439 errno = 0; 440 r = strtol(s, &p, 10); 441 442 if (errno != 0) 443 error("%s: out of range", s); 444 445 while (isspace((unsigned char)*p)) 446 p++; 447 448 if (*p) 449 error("%s: bad number", s); 450 451 return (int) r; 452 } 453 454 static int 455 newerf(const char *f1, const char *f2) 456 { 457 struct stat b1, b2; 458 459 return (stat(f1, &b1) == 0 && 460 stat(f2, &b2) == 0 && 461 b1.st_mtime > b2.st_mtime); 462 } 463 464 static int 465 olderf(const char *f1, const char *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 equalf(const char *f1, const char *f2) 476 { 477 struct stat b1, b2; 478 479 return (stat(f1, &b1) == 0 && 480 stat(f2, &b2) == 0 && 481 b1.st_dev == b2.st_dev && 482 b1.st_ino == b2.st_ino); 483 } 484