1 files changed, 583 insertions, 0 deletions

diff --git a/coreutils/test.c b/coreutils/test.c
new file mode 100644
index 000000000..85d06a83a
--- /dev/null
+++ b/coreutils/test.c
@@ -0,0 +1,583 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * echo implementation for busybox
+ *
+ * Copyright (c) by a whole pile of folks: 
+ *
+ *      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.
+ *      modified by Herbert Xu to be used as built-in in ash.
+ *      modified by Erik Andersen <andersee@debian.org> to be used 
+ *      in busybox.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Original copyright notice states:
+ *      "This program is in the Public Domain."
+ */
+
+#include "internal.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.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 gid_t *group_array = NULL;
+static int ngroups;
+
+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();
+static int test_eaccess();
+static int is_a_group_member();
+static void initialize_group_array();
+
+extern int
+test_main(int argc, char** argv)
+{
+        int     res;
+
+        if (strcmp(argv[0], "[") == 0) {
+                if (strcmp(argv[--argc], "]"))
+                        fatalError("missing ]");
+                argv[argc] = NULL;
+        }
+
+        /* Implement special cases from POSIX.2, section 4.62.4 */
+        switch (argc) {
+        case 1:
+                exit( 1);
+        case 2:
+                exit (*argv[1] == '\0');
+        case 3:
+                if (argv[1][0] == '!' && argv[1][1] == '\0') {
+                        exit (!(*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];
+                                exit (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];
+                                exit (!(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");
+
+        exit( res);
+}
+
+static void
+syntax(op, msg)
+        char    *op;
+        char    *msg;
+{
+        if (op && *op)
+                fatalError("%s: %s", op, msg);
+        else
+                fatalError("%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) == (char *)0)
+                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 */
+        return 1;
+}
+
+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 test_eaccess(nm, R_OK) == 0;
+        case FILWR:
+                return test_eaccess(nm, W_OK) == 0;
+        case FILEX:
+                return test_eaccess(nm, X_OK) == 0;
+        case FILEXIST:
+                return 1;
+        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 = (struct t_op *)0;
+                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 = (struct t_op *)0;
+        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)
+          fatalError("%s: out of range", s);
+
+        while (isspace(*p))
+          p++;
+        
+        if (*p)
+          fatalError("%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);
+}
+
+/* Do the same thing access(2) does, but use the effective uid and gid,
+   and don't make the mistake of telling root that any file is
+   executable. */
+static int
+test_eaccess (path, mode)
+char *path;
+int mode;
+{
+        struct stat st;
+        int euid = geteuid();
+
+        if (stat (path, &st) < 0)
+                return (-1);
+
+        if (euid == 0) {
+                /* Root can read or write any file. */
+                if (mode != X_OK)
+                return (0);
+
+                /* Root can execute any file that has any one of the execute
+                   bits set. */
+                if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
+                        return (0);
+        }
+
+        if (st.st_uid == euid)          /* owner */
+                mode <<= 6;
+        else if (is_a_group_member (st.st_gid))
+                mode <<= 3;
+
+        if (st.st_mode & mode)
+                return (0);
+
+        return (-1);
+}
+
+static void
+initialize_group_array ()
+{
+        ngroups = getgroups(0, NULL);
+        if ((group_array = realloc(group_array, ngroups * sizeof(gid_t))) == NULL)
+                fatalError("Out of space");
+
+        getgroups(ngroups, group_array);
+}
+
+/* Return non-zero if GID is one that we have in our groups list. */
+static int
+is_a_group_member (gid)
+gid_t gid;
+{
+        register int i;
+
+        /* Short-circuit if possible, maybe saving a call to getgroups(). */
+        if (gid == getgid() || gid == getegid())
+                return (1);
+
+        if (ngroups == 0)
+                initialize_group_array ();
+
+        /* Search through the list looking for GID. */
+        for (i = 0; i < ngroups; i++)
+                if (gid == group_array[i])
+                        return (1);
+
+        return (0);
+}