mirror of
https://github.com/sheumann/hush.git
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771 lines
16 KiB
C
771 lines
16 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 Reutner-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 "libbb.h"
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#include <setjmp.h>
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/* This is a NOFORK applet. Be very careful! */
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/* test_main() is called from shells, and we need to be extra careful here.
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* This is true regardless of PREFER_APPLETS and STANDALONE_SHELL
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* state. */
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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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#define TEST_DEBUG 0
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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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#if TEST_DEBUG
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int depth;
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#define nest_msg(...) do { \
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depth++; \
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fprintf(stderr, "%*s", depth*2, ""); \
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fprintf(stderr, __VA_ARGS__); \
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} while (0)
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#define unnest_msg(...) do { \
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fprintf(stderr, "%*s", depth*2, ""); \
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fprintf(stderr, __VA_ARGS__); \
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depth--; \
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} while (0)
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#define dbg_msg(...) do { \
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fprintf(stderr, "%*s", depth*2, ""); \
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fprintf(stderr, __VA_ARGS__); \
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} while (0)
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#define unnest_msg_and_return(expr, ...) do { \
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number_t __res = (expr); \
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fprintf(stderr, "%*s", depth*2, ""); \
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fprintf(stderr, __VA_ARGS__, res); \
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depth--; \
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return __res; \
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} while (0)
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static const char *const TOKSTR[] = {
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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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#else
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#define nest_msg(...) ((void)0)
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#define unnest_msg(...) ((void)0)
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#define dbg_msg(...) ((void)0)
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#define unnest_msg_and_return(expr, ...) return expr
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#endif
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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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struct operator_t {
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char op_text[4];
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unsigned char op_num, op_type;
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};
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static const struct operator_t 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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#if ENABLE_FEATURE_TEST_64
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typedef int64_t number_t;
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#else
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typedef int number_t;
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#endif
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/* We try to minimize both static and stack usage. */
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struct test_statics {
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char **args;
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/* set only by check_operator(), either to bogus struct
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* or points to matching operator_t struct. Never NULL. */
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const struct operator_t *last_operator;
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gid_t *group_array;
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int ngroups;
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jmp_buf leaving;
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};
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/* See test_ptr_hack.c */
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extern struct test_statics *const test_ptr_to_statics;
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#define S (*test_ptr_to_statics)
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#define args (S.args )
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#define last_operator (S.last_operator)
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#define group_array (S.group_array )
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#define ngroups (S.ngroups )
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#define leaving (S.leaving )
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#define INIT_S() do { \
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(*(struct test_statics**)&test_ptr_to_statics) = xzalloc(sizeof(S)); \
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barrier(); \
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} while (0)
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#define DEINIT_S() do { \
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free(test_ptr_to_statics); \
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} while (0)
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static number_t primary(enum token n);
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static void syntax(const char *op, const char *msg) 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: %s"+4, msg);
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}
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longjmp(leaving, 2);
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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 number_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 &&
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b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino);
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}
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*/
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static enum token check_operator(char *s)
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{
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static const struct operator_t no_op = {
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.op_num = -1,
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.op_type = -1
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};
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const struct operator_t *op;
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last_operator = &no_op;
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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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last_operator = 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 + ARRAY_SIZE(ops));
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return OPERAND;
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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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const struct operator_t *op;
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number_t val1, val2;
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opnd1 = *args;
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check_operator(*++args);
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op = last_operator;
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opnd2 = *++args;
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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 at least one 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 void initialize_group_array(void)
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{
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ngroups = getgroups(0, NULL);
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if (ngroups > 0) {
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/* FIXME: ash tries so hard to not die on OOM,
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* and we spoil it with just one xrealloc here */
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/* We realloc, because test_main can be entered repeatedly by shell.
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* Testcase (ash): 'while true; do test -x some_file; done'
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* and watch top. (some_file must have owner != you) */
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group_array = xrealloc(group_array, ngroups * sizeof(gid_t));
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getgroups(ngroups, group_array);
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}
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}
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/* Return non-zero if GID is one that we have in our groups list. */
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//XXX: FIXME: duplicate of existing libbb function?
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// see toplevel TODO file:
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// possible code duplication ingroup() and is_a_group_member()
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static int is_a_group_member(gid_t gid)
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{
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int i;
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/* Short-circuit if possible, maybe saving a call to getgroups(). */
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if (gid == getgid() || gid == getegid())
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return 1;
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if (ngroups == 0)
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initialize_group_array();
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/* Search through the list looking for GID. */
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for (i = 0; i < ngroups; i++)
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if (gid == group_array[i])
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return 1;
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return 0;
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}
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/* Do the same thing access(2) does, but use the effective uid and gid,
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and don't make the mistake of telling root that any file is
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executable. */
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static int test_eaccess(char *path, int mode)
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{
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struct stat st;
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unsigned int euid = geteuid();
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if (stat(path, &st) < 0)
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return -1;
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if (euid == 0) {
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/* Root can read or write any file. */
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if (mode != X_OK)
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return 0;
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/* Root can execute any file that has any one of the execute
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bits set. */
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if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
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return 0;
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}
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if (st.st_uid == euid) /* owner */
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mode <<= 6;
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else if (is_a_group_member(st.st_gid))
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mode <<= 3;
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if (st.st_mode & mode)
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return 0;
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return -1;
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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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unsigned i = i; /* gcc 3.x thinks it can be used uninitialized */
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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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}
|
|
if (mode == FILSOCK) {
|
|
#ifdef S_IFSOCK
|
|
i = S_IFSOCK;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
filetype:
|
|
return ((s.st_mode & S_IFMT) == i);
|
|
}
|
|
if (is_file_bit(mode)) {
|
|
if (mode == FILSUID)
|
|
i = S_ISUID;
|
|
if (mode == FILSGID)
|
|
i = S_ISGID;
|
|
if (mode == FILSTCK)
|
|
i = S_ISVTX;
|
|
return ((s.st_mode & i) != 0);
|
|
}
|
|
if (mode == FILGZ)
|
|
return s.st_size > 0L;
|
|
if (mode == FILUID)
|
|
return s.st_uid == geteuid();
|
|
if (mode == FILGID)
|
|
return s.st_gid == getegid();
|
|
return 1; /* NOTREACHED */
|
|
}
|
|
|
|
|
|
static number_t nexpr(enum token n)
|
|
{
|
|
number_t res;
|
|
|
|
nest_msg(">nexpr(%s)\n", TOKSTR[n]);
|
|
if (n == UNOT) {
|
|
res = !nexpr(check_operator(*++args));
|
|
unnest_msg("<nexpr:%lld\n", res);
|
|
return res;
|
|
}
|
|
res = primary(n);
|
|
unnest_msg("<nexpr:%lld\n", res);
|
|
return res;
|
|
}
|
|
|
|
|
|
static number_t aexpr(enum token n)
|
|
{
|
|
number_t res;
|
|
|
|
nest_msg(">aexpr(%s)\n", TOKSTR[n]);
|
|
res = nexpr(n);
|
|
dbg_msg("aexpr: nexpr:%lld, next args:%s\n", res, args[1]);
|
|
if (check_operator(*++args) == BAND) {
|
|
dbg_msg("aexpr: arg is AND, next args:%s\n", args[1]);
|
|
res = aexpr(check_operator(*++args)) && res;
|
|
unnest_msg("<aexpr:%lld\n", res);
|
|
return res;
|
|
}
|
|
args--;
|
|
unnest_msg("<aexpr:%lld, args:%s\n", res, args[0]);
|
|
return res;
|
|
}
|
|
|
|
|
|
static number_t oexpr(enum token n)
|
|
{
|
|
number_t res;
|
|
|
|
nest_msg(">oexpr(%s)\n", TOKSTR[n]);
|
|
res = aexpr(n);
|
|
dbg_msg("oexpr: aexpr:%lld, next args:%s\n", res, args[1]);
|
|
if (check_operator(*++args) == BOR) {
|
|
dbg_msg("oexpr: next arg is OR, next args:%s\n", args[1]);
|
|
res = oexpr(check_operator(*++args)) || res;
|
|
unnest_msg("<oexpr:%lld\n", res);
|
|
return res;
|
|
}
|
|
args--;
|
|
unnest_msg("<oexpr:%lld, args:%s\n", res, args[0]);
|
|
return res;
|
|
}
|
|
|
|
|
|
static number_t primary(enum token n)
|
|
{
|
|
#if TEST_DEBUG
|
|
number_t res = res; /* for compiler */
|
|
#else
|
|
number_t res;
|
|
#endif
|
|
const struct operator_t *args0_op;
|
|
|
|
nest_msg(">primary(%s)\n", TOKSTR[n]);
|
|
if (n == EOI) {
|
|
syntax(NULL, "argument expected");
|
|
}
|
|
if (n == LPAREN) {
|
|
res = oexpr(check_operator(*++args));
|
|
if (check_operator(*++args) != RPAREN)
|
|
syntax(NULL, "closing paren expected");
|
|
unnest_msg("<primary:%lld\n", res);
|
|
return res;
|
|
}
|
|
|
|
/* coreutils 6.9 checks "is args[1] binop and args[2] exist?" first,
|
|
* do the same */
|
|
args0_op = last_operator;
|
|
/* last_operator = operator at args[1] */
|
|
if (check_operator(args[1]) != EOI) { /* if args[1] != NULL */
|
|
if (args[2]) {
|
|
// coreutils also does this:
|
|
// if (args[3] && args[0]="-l" && args[2] is BINOP)
|
|
// return binop(1 /* prepended by -l */);
|
|
if (last_operator->op_type == BINOP)
|
|
unnest_msg_and_return(binop(), "<primary: binop:%lld\n");
|
|
}
|
|
}
|
|
/* check "is args[0] unop?" second */
|
|
if (args0_op->op_type == UNOP) {
|
|
/* unary expression */
|
|
if (args[1] == NULL)
|
|
// syntax(args0_op->op_text, "argument expected");
|
|
goto check_emptiness;
|
|
args++;
|
|
if (n == STREZ)
|
|
unnest_msg_and_return(args[0][0] == '\0', "<primary:%lld\n");
|
|
if (n == STRNZ)
|
|
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
|
|
if (n == FILTT)
|
|
unnest_msg_and_return(isatty(getn(*args)), "<primary: isatty(%s)%lld\n", *args);
|
|
unnest_msg_and_return(filstat(*args, n), "<primary: filstat(%s):%lld\n", *args);
|
|
}
|
|
|
|
/*check_operator(args[1]); - already done */
|
|
if (last_operator->op_type == BINOP) {
|
|
/* args[2] is known to be NULL, isn't it bound to fail? */
|
|
unnest_msg_and_return(binop(), "<primary:%lld\n");
|
|
}
|
|
check_emptiness:
|
|
unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
|
|
}
|
|
|
|
|
|
int test_main(int argc, char **argv)
|
|
{
|
|
int res;
|
|
const char *arg0;
|
|
// bool negate = 0;
|
|
|
|
arg0 = bb_basename(argv[0]);
|
|
if (arg0[0] == '[') {
|
|
--argc;
|
|
if (!arg0[1]) { /* "[" ? */
|
|
if (NOT_LONE_CHAR(argv[argc], ']')) {
|
|
bb_error_msg("missing ]");
|
|
return 2;
|
|
}
|
|
} else { /* assuming "[[" */
|
|
if (strcmp(argv[argc], "]]") != 0) {
|
|
bb_error_msg("missing ]]");
|
|
return 2;
|
|
}
|
|
}
|
|
argv[argc] = NULL;
|
|
}
|
|
|
|
/* We must do DEINIT_S() prior to returning */
|
|
INIT_S();
|
|
|
|
res = setjmp(leaving);
|
|
if (res)
|
|
goto ret;
|
|
|
|
/* resetting ngroups is probably unnecessary. it will
|
|
* force a new call to getgroups(), which prevents using
|
|
* group data fetched during a previous call. but the
|
|
* only way the group data could be stale is if there's
|
|
* been an intervening call to setgroups(), and this
|
|
* isn't likely in the case of a shell. paranoia
|
|
* prevails...
|
|
*/
|
|
ngroups = 0;
|
|
|
|
//argc--;
|
|
argv++;
|
|
|
|
/* Implement special cases from POSIX.2, section 4.62.4 */
|
|
if (!argv[0]) { /* "test" */
|
|
res = 1;
|
|
goto ret;
|
|
}
|
|
#if 0
|
|
// Now it's fixed in the parser and should not be needed
|
|
if (LONE_CHAR(argv[0], '!') && argv[1]) {
|
|
negate = 1;
|
|
//argc--;
|
|
argv++;
|
|
}
|
|
if (!argv[1]) { /* "test [!] arg" */
|
|
res = (*argv[0] == '\0');
|
|
goto ret;
|
|
}
|
|
if (argv[2] && !argv[3]) {
|
|
check_operator(argv[1]);
|
|
if (last_operator->op_type == BINOP) {
|
|
/* "test [!] arg1 <binary_op> arg2" */
|
|
args = &argv[0];
|
|
res = (binop() == 0);
|
|
goto ret;
|
|
}
|
|
}
|
|
|
|
/* Some complex expression. Undo '!' removal */
|
|
if (negate) {
|
|
negate = 0;
|
|
//argc++;
|
|
argv--;
|
|
}
|
|
#endif
|
|
args = &argv[0];
|
|
res = !oexpr(check_operator(*args));
|
|
|
|
if (*args != NULL && *++args != NULL) {
|
|
/* TODO: example when this happens? */
|
|
bb_error_msg("%s: unknown operand", *args);
|
|
res = 2;
|
|
}
|
|
ret:
|
|
DEINIT_S();
|
|
// return negate ? !res : res;
|
|
return res;
|
|
}
|