mirror of
https://github.com/sheumann/hush.git
synced 2024-12-22 14:30:31 +00:00
dcf4de20a1
ps: fix warning, make a bit smaller kill -l: make smaller & know much more signals function old new delta get_signum 121 153 +32 kill_main 826 843 +17 get_signame 44 36 -8 signals 252 224 -28 .rodata 131955 131923 -32 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/3 up/down: 49/-68) Total: -19 bytes
598 lines
12 KiB
C
598 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* test implementation for busybox
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*
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* Copyright (c) by a whole pile of folks:
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*
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* test(1); version 7-like -- author Erik Baalbergen
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* modified by Eric Gisin to be used as built-in.
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* modified by Arnold Robbins to add SVR3 compatibility
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* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
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* modified by J.T. Conklin for NetBSD.
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* modified by Herbert Xu to be used as built-in in ash.
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* modified by Erik Andersen <andersen@codepoet.org> to be used
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* in busybox.
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* modified by Bernhard Fischer to be useable (i.e. a bit less bloaty).
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* Original copyright notice states:
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* "This program is in the Public Domain."
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*/
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#include "busybox.h"
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#include <setjmp.h>
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/* This is a NOEXEC applet. Be very careful! */
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/* test(1) accepts the following grammar:
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oexpr ::= aexpr | aexpr "-o" oexpr ;
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aexpr ::= nexpr | nexpr "-a" aexpr ;
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nexpr ::= primary | "!" primary
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primary ::= unary-operator operand
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| operand binary-operator operand
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| operand
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| "(" oexpr ")"
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;
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unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
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"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
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binary-operator ::= "="|"=="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
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"-nt"|"-ot"|"-ef";
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operand ::= <any legal UNIX file name>
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*/
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enum token {
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EOI,
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FILRD,
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FILWR,
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FILEX,
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FILEXIST,
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FILREG,
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FILDIR,
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FILCDEV,
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FILBDEV,
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FILFIFO,
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FILSOCK,
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FILSYM,
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FILGZ,
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FILTT,
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FILSUID,
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FILSGID,
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FILSTCK,
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FILNT,
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FILOT,
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FILEQ,
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FILUID,
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FILGID,
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STREZ,
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STRNZ,
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STREQ,
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STRNE,
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STRLT,
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STRGT,
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INTEQ,
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INTNE,
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INTGE,
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INTGT,
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INTLE,
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INTLT,
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UNOT,
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BAND,
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BOR,
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LPAREN,
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RPAREN,
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OPERAND
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};
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#define is_int_op(a) (((unsigned char)((a) - INTEQ)) <= 5)
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#define is_str_op(a) (((unsigned char)((a) - STREZ)) <= 5)
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#define is_file_op(a) (((unsigned char)((a) - FILNT)) <= 2)
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#define is_file_access(a) (((unsigned char)((a) - FILRD)) <= 2)
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#define is_file_type(a) (((unsigned char)((a) - FILREG)) <= 5)
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#define is_file_bit(a) (((unsigned char)((a) - FILSUID)) <= 2)
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enum token_types {
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UNOP,
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BINOP,
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BUNOP,
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BBINOP,
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PAREN
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};
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static const struct t_op {
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char op_text[4];
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unsigned char op_num, op_type;
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} ops[] = {
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{ "-r", FILRD , UNOP },
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{ "-w", FILWR , UNOP },
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{ "-x", FILEX , UNOP },
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{ "-e", FILEXIST, UNOP },
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{ "-f", FILREG , UNOP },
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{ "-d", FILDIR , UNOP },
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{ "-c", FILCDEV , UNOP },
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{ "-b", FILBDEV , UNOP },
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{ "-p", FILFIFO , UNOP },
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{ "-u", FILSUID , UNOP },
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{ "-g", FILSGID , UNOP },
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{ "-k", FILSTCK , UNOP },
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{ "-s", FILGZ , UNOP },
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{ "-t", FILTT , UNOP },
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{ "-z", STREZ , UNOP },
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{ "-n", STRNZ , UNOP },
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{ "-h", FILSYM , UNOP }, /* for backwards compat */
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{ "-O" , FILUID , UNOP },
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{ "-G" , FILGID , UNOP },
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{ "-L" , FILSYM , UNOP },
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{ "-S" , FILSOCK, UNOP },
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{ "=" , STREQ , BINOP },
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{ "==" , STREQ , BINOP },
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{ "!=" , STRNE , BINOP },
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{ "<" , STRLT , BINOP },
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{ ">" , STRGT , BINOP },
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{ "-eq", INTEQ , BINOP },
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{ "-ne", INTNE , BINOP },
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{ "-ge", INTGE , BINOP },
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{ "-gt", INTGT , BINOP },
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{ "-le", INTLE , BINOP },
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{ "-lt", INTLT , BINOP },
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{ "-nt", FILNT , BINOP },
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{ "-ot", FILOT , BINOP },
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{ "-ef", FILEQ , BINOP },
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{ "!" , UNOT , BUNOP },
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{ "-a" , BAND , BBINOP },
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{ "-o" , BOR , BBINOP },
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{ "(" , LPAREN , PAREN },
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{ ")" , RPAREN , PAREN },
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};
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enum { NUM_OPS = sizeof(ops) / sizeof(ops[0]) };
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#if ENABLE_FEATURE_TEST_64
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typedef int64_t arith_t;
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#else
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typedef int arith_t;
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#endif
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/* Cannot eliminate these static data (do the G trick)
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* because of bb_test usage from other applets */
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static char **t_wp;
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static struct t_op const *t_wp_op;
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static gid_t *group_array;
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static int ngroups;
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static jmp_buf leaving;
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static enum token t_lex(char *s);
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static arith_t oexpr(enum token n);
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static arith_t aexpr(enum token n);
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static arith_t nexpr(enum token n);
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static int binop(void);
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static arith_t primary(enum token n);
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static int filstat(char *nm, enum token mode);
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static arith_t getn(const char *s);
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/* UNUSED
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static int newerf(const char *f1, const char *f2);
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static int olderf(const char *f1, const char *f2);
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static int equalf(const char *f1, const char *f2);
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*/
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static int test_eaccess(char *path, int mode);
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static int is_a_group_member(gid_t gid);
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static void initialize_group_array(void);
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int bb_test(int argc, char **argv)
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{
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int res;
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if (LONE_CHAR(argv[0], '[')) {
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--argc;
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if (NOT_LONE_CHAR(argv[argc], ']')) {
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bb_error_msg("missing ]");
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return 2;
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}
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argv[argc] = NULL;
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} else if (strcmp(argv[0], "[[") == 0) {
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--argc;
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if (strcmp(argv[argc], "]]")) {
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bb_error_msg("missing ]]");
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return 2;
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}
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argv[argc] = NULL;
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}
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res = setjmp(leaving);
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if (res)
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return res;
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/* resetting ngroups is probably unnecessary. it will
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* force a new call to getgroups(), which prevents using
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* group data fetched during a previous call. but the
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* only way the group data could be stale is if there's
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* been an intervening call to setgroups(), and this
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* isn't likely in the case of a shell. paranoia
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* prevails...
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*/
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ngroups = 0;
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/* Implement special cases from POSIX.2, section 4.62.4 */
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if (argc == 1)
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return 1;
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if (argc == 2)
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return *argv[1] == '\0';
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//assert(argc);
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if (LONE_CHAR(argv[1], '!')) {
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bool _off;
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if (argc == 3)
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return *argv[2] != '\0';
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_off = argc - 4;
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t_lex(argv[2 + _off]);
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if (t_wp_op && t_wp_op->op_type == BINOP) {
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t_wp = &argv[1 + _off];
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return binop() == 0;
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}
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}
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t_wp = &argv[1];
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res = !oexpr(t_lex(*t_wp));
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if (*t_wp != NULL && *++t_wp != NULL) {
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bb_error_msg("%s: unknown operand", *t_wp);
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return 2;
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}
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return res;
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}
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static void syntax(const char *op, const char *msg) ATTRIBUTE_NORETURN;
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static void syntax(const char *op, const char *msg)
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{
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if (op && *op) {
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bb_error_msg("%s: %s", op, msg);
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} else {
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bb_error_msg("%s", msg);
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}
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longjmp(leaving, 2);
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}
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static arith_t oexpr(enum token n)
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{
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arith_t res;
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res = aexpr(n);
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if (t_lex(*++t_wp) == BOR) {
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return oexpr(t_lex(*++t_wp)) || res;
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}
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t_wp--;
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return res;
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}
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static arith_t aexpr(enum token n)
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{
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arith_t res;
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res = nexpr(n);
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if (t_lex(*++t_wp) == BAND)
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return aexpr(t_lex(*++t_wp)) && res;
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t_wp--;
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return res;
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}
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static arith_t nexpr(enum token n)
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{
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if (n == UNOT)
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return !nexpr(t_lex(*++t_wp));
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return primary(n);
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}
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static arith_t primary(enum token n)
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{
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arith_t res;
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if (n == EOI) {
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syntax(NULL, "argument expected");
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}
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if (n == LPAREN) {
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res = oexpr(t_lex(*++t_wp));
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if (t_lex(*++t_wp) != RPAREN)
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syntax(NULL, "closing paren expected");
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return res;
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}
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if (t_wp_op && t_wp_op->op_type == UNOP) {
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/* unary expression */
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if (*++t_wp == NULL)
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syntax(t_wp_op->op_text, "argument expected");
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if (n == STREZ)
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return t_wp[0][0] == '\0';
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if (n == STRNZ)
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return t_wp[0][0] != '\0';
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if (n == FILTT)
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return isatty(getn(*t_wp));
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return filstat(*t_wp, n);
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}
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t_lex(t_wp[1]);
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if (t_wp_op && t_wp_op->op_type == BINOP) {
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return binop();
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}
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return t_wp[0][0] != '\0';
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}
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static int binop(void)
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{
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const char *opnd1, *opnd2;
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struct t_op const *op;
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smallint val1, val2;
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opnd1 = *t_wp;
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(void) t_lex(*++t_wp);
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op = t_wp_op;
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opnd2 = *++t_wp;
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if (opnd2 == NULL)
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syntax(op->op_text, "argument expected");
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if (is_int_op(op->op_num)) {
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val1 = getn(opnd1);
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val2 = getn(opnd2);
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if (op->op_num == INTEQ)
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return val1 == val2;
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if (op->op_num == INTNE)
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return val1 != val2;
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if (op->op_num == INTGE)
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return val1 >= val2;
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if (op->op_num == INTGT)
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return val1 > val2;
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if (op->op_num == INTLE)
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return val1 <= val2;
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if (op->op_num == INTLT)
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return val1 < val2;
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}
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if (is_str_op(op->op_num)) {
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val1 = strcmp(opnd1, opnd2);
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if (op->op_num == STREQ)
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return val1 == 0;
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if (op->op_num == STRNE)
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return val1 != 0;
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if (op->op_num == STRLT)
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return val1 < 0;
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if (op->op_num == STRGT)
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return val1 > 0;
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}
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/* We are sure that these three are by now the only binops we didn't check
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* yet, so we do not check if the class is correct:
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*/
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/* if (is_file_op(op->op_num)) */
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{
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struct stat b1, b2;
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if (!(!stat(opnd1, &b1) && !stat(opnd2, &b2)))
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return 0; /* false, since stat failed */
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if (op->op_num == FILNT)
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return b1.st_mtime > b2.st_mtime;
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if (op->op_num == FILOT)
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return b1.st_mtime < b2.st_mtime;
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if (op->op_num == FILEQ)
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return b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino;
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}
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return 1; /* NOTREACHED */
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}
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static int filstat(char *nm, enum token mode)
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{
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struct stat s;
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int i;
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if (mode == FILSYM) {
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#ifdef S_IFLNK
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if (lstat(nm, &s) == 0) {
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i = S_IFLNK;
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goto filetype;
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}
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#endif
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return 0;
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}
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if (stat(nm, &s) != 0)
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return 0;
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if (mode == FILEXIST)
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return 1;
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if (is_file_access(mode)) {
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if (mode == FILRD)
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i = R_OK;
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if (mode == FILWR)
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i = W_OK;
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if (mode == FILEX)
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i = X_OK;
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return test_eaccess(nm, i) == 0;
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}
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if (is_file_type(mode)) {
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if (mode == FILREG)
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i = S_IFREG;
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if (mode == FILDIR)
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i = S_IFDIR;
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if (mode == FILCDEV)
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i = S_IFCHR;
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if (mode == FILBDEV)
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i = S_IFBLK;
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if (mode == FILFIFO) {
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#ifdef S_IFIFO
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i = S_IFIFO;
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#else
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return 0;
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#endif
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}
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if (mode == FILSOCK) {
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#ifdef S_IFSOCK
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i = S_IFSOCK;
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#else
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return 0;
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#endif
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}
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filetype:
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return ((s.st_mode & S_IFMT) == i);
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}
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if (is_file_bit(mode)) {
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if (mode == FILSUID)
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i = S_ISUID;
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if (mode == FILSGID)
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i = S_ISGID;
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if (mode == FILSTCK)
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i = S_ISVTX;
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return ((s.st_mode & i) != 0);
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}
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if (mode == FILGZ)
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return s.st_size > 0L;
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if (mode == FILUID)
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return s.st_uid == geteuid();
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if (mode == FILGID)
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return s.st_gid == getegid();
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return 1; /* NOTREACHED */
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}
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static enum token t_lex(char *s)
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{
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const struct t_op *op;
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t_wp_op = NULL;
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if (s == NULL) {
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return EOI;
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}
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op = ops;
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do {
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if (strcmp(s, op->op_text) == 0) {
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t_wp_op = op;
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return op->op_num;
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}
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op++;
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} while (op < ops + NUM_OPS);
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return OPERAND;
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}
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/* atoi with error detection */
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//XXX: FIXME: duplicate of existing libbb function?
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static arith_t getn(const char *s)
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{
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char *p;
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#if ENABLE_FEATURE_TEST_64
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long long r;
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#else
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long r;
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#endif
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errno = 0;
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#if ENABLE_FEATURE_TEST_64
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r = strtoll(s, &p, 10);
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#else
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r = strtol(s, &p, 10);
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#endif
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if (errno != 0)
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syntax(s, "out of range");
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if (*(skip_whitespace(p)))
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syntax(s, "bad number");
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return r;
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}
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/* UNUSED
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static int newerf(const char *f1, const char *f2)
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{
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struct stat b1, b2;
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return (stat(f1, &b1) == 0 &&
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stat(f2, &b2) == 0 && b1.st_mtime > b2.st_mtime);
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}
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static int olderf(const char *f1, const char *f2)
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{
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struct stat b1, b2;
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return (stat(f1, &b1) == 0 &&
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stat(f2, &b2) == 0 && b1.st_mtime < b2.st_mtime);
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}
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static int equalf(const char *f1, const char *f2)
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{
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struct stat b1, b2;
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return (stat(f1, &b1) == 0 &&
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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(char *path, int mode)
|
|
{
|
|
struct stat st;
|
|
unsigned 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(void)
|
|
{
|
|
ngroups = getgroups(0, NULL);
|
|
if (ngroups > 0) {
|
|
group_array = xmalloc(ngroups * sizeof(gid_t));
|
|
getgroups(ngroups, group_array);
|
|
}
|
|
}
|
|
|
|
/* Return non-zero if GID is one that we have in our groups list. */
|
|
//XXX: FIXME: duplicate of existing libbb function?
|
|
// see toplevel TODO file:
|
|
// possible code duplication ingroup() and is_a_group_member()
|
|
static int is_a_group_member(gid_t gid)
|
|
{
|
|
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;
|
|
}
|
|
|
|
|
|
/* applet entry point */
|
|
|
|
int test_main(int argc, char **argv);
|
|
int test_main(int argc, char **argv)
|
|
{
|
|
return bb_test(argc, argv);
|
|
}
|