/* $OpenBSD: test.c,v 1.6 2001/11/05 07:39:16 mpech Exp $ */ /* $NetBSD: test.c,v 1.15 1995/03/21 07:04:06 cgd Exp $ */ /* * test(1); version 7-like -- author Erik Baalbergen * modified by Eric Gisin to be used as built-in. * modified by Arnold Robbins to add SVR3 compatibility * (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket). * modified by J.T. Conklin for NetBSD. * * This program is in the Public Domain. */ #ifndef lint static char rcsid[] = "$OpenBSD: test.c,v 1.6 2001/11/05 07:39:16 mpech Exp $"; #endif #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <ctype.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <err.h> /* test(1) accepts the following grammar: oexpr ::= aexpr | aexpr "-o" oexpr ; aexpr ::= nexpr | nexpr "-a" aexpr ; nexpr ::= primary | "!" primary primary ::= unary-operator operand | operand binary-operator operand | operand | "(" oexpr ")" ; unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"| "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S"; binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"| "-nt"|"-ot"|"-ef"; operand ::= <any legal UNIX file name> */ enum token { EOI, FILRD, FILWR, FILEX, FILEXIST, FILREG, FILDIR, FILCDEV, FILBDEV, FILFIFO, FILSOCK, FILSYM, FILGZ, FILTT, FILSUID, FILSGID, FILSTCK, FILNT, FILOT, FILEQ, FILUID, FILGID, STREZ, STRNZ, STREQ, STRNE, STRLT, STRGT, INTEQ, INTNE, INTGE, INTGT, INTLE, INTLT, UNOT, BAND, BOR, LPAREN, RPAREN, OPERAND }; enum token_types { UNOP, BINOP, BUNOP, BBINOP, PAREN }; struct t_op { const char *op_text; short op_num, op_type; } const ops [] = { {"-r", FILRD, UNOP}, {"-w", FILWR, UNOP}, {"-x", FILEX, UNOP}, {"-e", FILEXIST,UNOP}, {"-f", FILREG, UNOP}, {"-d", FILDIR, UNOP}, {"-c", FILCDEV,UNOP}, {"-b", FILBDEV,UNOP}, {"-p", FILFIFO,UNOP}, {"-u", FILSUID,UNOP}, {"-g", FILSGID,UNOP}, {"-k", FILSTCK,UNOP}, {"-s", FILGZ, UNOP}, {"-t", FILTT, UNOP}, {"-z", STREZ, UNOP}, {"-n", STRNZ, UNOP}, {"-h", FILSYM, UNOP}, /* for backwards compat */ {"-O", FILUID, UNOP}, {"-G", FILGID, UNOP}, {"-L", FILSYM, UNOP}, {"-S", FILSOCK,UNOP}, {"=", STREQ, BINOP}, {"!=", STRNE, BINOP}, {"<", STRLT, BINOP}, {">", STRGT, BINOP}, {"-eq", INTEQ, BINOP}, {"-ne", INTNE, BINOP}, {"-ge", INTGE, BINOP}, {"-gt", INTGT, BINOP}, {"-le", INTLE, BINOP}, {"-lt", INTLT, BINOP}, {"-nt", FILNT, BINOP}, {"-ot", FILOT, BINOP}, {"-ef", FILEQ, BINOP}, {"!", UNOT, BUNOP}, {"-a", BAND, BBINOP}, {"-o", BOR, BBINOP}, {"(", LPAREN, PAREN}, {")", RPAREN, PAREN}, {0, 0, 0} }; char **t_wp; struct t_op const *t_wp_op; static enum token t_lex(); static int oexpr(); static int aexpr(); static int nexpr(); static int binop(); static int primary(); static int filstat(); static int getn(); static int newerf(); static int olderf(); static int equalf(); static void syntax(); int main(argc, argv) int argc; char **argv; { int res; if (strcmp(argv[0], "[") == 0) { if (strcmp(argv[--argc], "]")) errx(2, "missing ]"); argv[argc] = NULL; } /* Implement special cases from POSIX.2, section 4.62.4 */ switch (argc) { case 1: return 1; case 2: return (*argv[1] == '\0'); case 3: if (argv[1][0] == '!' && argv[1][1] == '\0') { return !(*argv[2] == '\0'); } break; case 4: if (argv[1][0] != '!' || argv[1][1] != '\0') { if (t_lex(argv[2]), t_wp_op && t_wp_op->op_type == BINOP) { t_wp = &argv[1]; return (binop() == 0); } } break; case 5: if (argv[1][0] == '!' && argv[1][1] == '\0') { if (t_lex(argv[3]), t_wp_op && t_wp_op->op_type == BINOP) { t_wp = &argv[2]; return !(binop() == 0); } } break; } t_wp = &argv[1]; res = !oexpr(t_lex(*t_wp)); if (*t_wp != NULL && *++t_wp != NULL) syntax(*t_wp, "unknown operand"); return res; } static __dead void syntax(op, msg) char *op; char *msg; { if (op && *op) errx(2, "%s: %s", op, msg); else errx(2, "%s", msg); } static int oexpr(n) enum token n; { int res; res = aexpr(n); if (t_lex(*++t_wp) == BOR) return oexpr(t_lex(*++t_wp)) || res; t_wp--; return res; } static int aexpr(n) enum token n; { int res; res = nexpr(n); if (t_lex(*++t_wp) == BAND) return aexpr(t_lex(*++t_wp)) && res; t_wp--; return res; } static int nexpr(n) enum token n; /* token */ { if (n == UNOT) return !nexpr(t_lex(*++t_wp)); return primary(n); } static int primary(n) enum token n; { int res; if (n == EOI) syntax(NULL, "argument expected"); if (n == LPAREN) { res = oexpr(t_lex(*++t_wp)); if (t_lex(*++t_wp) != RPAREN) syntax(NULL, "closing paren expected"); return res; } if (t_wp_op && t_wp_op->op_type == UNOP) { /* unary expression */ if (*++t_wp == NULL) syntax(t_wp_op->op_text, "argument expected"); switch (n) { case STREZ: return strlen(*t_wp) == 0; case STRNZ: return strlen(*t_wp) != 0; case FILTT: return isatty(getn(*t_wp)); default: return filstat(*t_wp, n); } } if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) { return binop(); } return strlen(*t_wp) > 0; } static int binop() { const char *opnd1, *opnd2; struct t_op const *op; opnd1 = *t_wp; (void) t_lex(*++t_wp); op = t_wp_op; if ((opnd2 = *++t_wp) == NULL) syntax(op->op_text, "argument expected"); switch (op->op_num) { case STREQ: return strcmp(opnd1, opnd2) == 0; case STRNE: return strcmp(opnd1, opnd2) != 0; case STRLT: return strcmp(opnd1, opnd2) < 0; case STRGT: return strcmp(opnd1, opnd2) > 0; case INTEQ: return getn(opnd1) == getn(opnd2); case INTNE: return getn(opnd1) != getn(opnd2); case INTGE: return getn(opnd1) >= getn(opnd2); case INTGT: return getn(opnd1) > getn(opnd2); case INTLE: return getn(opnd1) <= getn(opnd2); case INTLT: return getn(opnd1) < getn(opnd2); case FILNT: return newerf (opnd1, opnd2); case FILOT: return olderf (opnd1, opnd2); case FILEQ: return equalf (opnd1, opnd2); } /* NOTREACHED */ } static int filstat(nm, mode) char *nm; enum token mode; { struct stat s; int i; if (mode == FILSYM) { #ifdef S_IFLNK if (lstat(nm, &s) == 0) { i = S_IFLNK; goto filetype; } #endif return 0; } if (stat(nm, &s) != 0) return 0; switch (mode) { case FILRD: return access(nm, R_OK) == 0; case FILWR: return access(nm, W_OK) == 0; case FILEX: return access(nm, X_OK) == 0; case FILEXIST: return access(nm, F_OK) == 0; case FILREG: i = S_IFREG; goto filetype; case FILDIR: i = S_IFDIR; goto filetype; case FILCDEV: i = S_IFCHR; goto filetype; case FILBDEV: i = S_IFBLK; goto filetype; case FILFIFO: #ifdef S_IFIFO i = S_IFIFO; goto filetype; #else return 0; #endif case FILSOCK: #ifdef S_IFSOCK i = S_IFSOCK; goto filetype; #else return 0; #endif case FILSUID: i = S_ISUID; goto filebit; case FILSGID: i = S_ISGID; goto filebit; case FILSTCK: i = S_ISVTX; goto filebit; case FILGZ: return s.st_size > 0L; case FILUID: return s.st_uid == geteuid(); case FILGID: return s.st_gid == getegid(); default: return 1; } filetype: return ((s.st_mode & S_IFMT) == i); filebit: return ((s.st_mode & i) != 0); } static enum token t_lex(s) char *s; { struct t_op const *op = ops; if (s == 0) { t_wp_op = NULL; return EOI; } while (op->op_text) { if (strcmp(s, op->op_text) == 0) { t_wp_op = op; return op->op_num; } op++; } t_wp_op = NULL; return OPERAND; } /* atoi with error detection */ static int getn(s) char *s; { char *p; long r; errno = 0; r = strtol(s, &p, 10); if (errno != 0) errx(2, "%s: out of range", s); while (isspace(*p)) p++; if (*p) errx(2, "%s: bad number", s); return (int) r; } static int newerf (f1, f2) char *f1, *f2; { struct stat b1, b2; return (stat (f1, &b1) == 0 && stat (f2, &b2) == 0 && b1.st_mtime > b2.st_mtime); } static int olderf (f1, f2) char *f1, *f2; { struct stat b1, b2; return (stat (f1, &b1) == 0 && stat (f2, &b2) == 0 && b1.st_mtime < b2.st_mtime); } static int equalf (f1, f2) char *f1, *f2; { struct stat b1, b2; return (stat (f1, &b1) == 0 && stat (f2, &b2) == 0 && b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino); }