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|
/* $NetBSD: test.c,v 1.21 1999/04/05 09:48:38 kleink Exp $ */
/*-
* test(1); version 7-like -- author Erik Baalbergen
* modified by Eric Gisin to be used as built-in.
* modified by Arnold Robbins to add SVR3 compatibility
* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
* modified by J.T. Conklin for NetBSD.
*
* This program is in the Public Domain.
*/
/*
* Important: This file is used both as a standalone program /bin/test and
* as a builtin for /bin/sh (#define SHELL).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/bin/test/test.c 259017 2013-12-05 22:53:32Z jilles $");
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef SHELL
#define main testcmd
#include "bltin/bltin.h"
#else
#include <locale.h>
static void error(const char *, ...) __dead2 __printf0like(1, 2);
static void
error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
verrx(2, msg, ap);
/*NOTREACHED*/
va_end(ap);
}
#endif
/* 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_types {
UNOP = 0x100,
BINOP = 0x200,
BUNOP = 0x300,
BBINOP = 0x400,
PAREN = 0x500
};
enum token {
EOI,
OPERAND,
FILRD = UNOP + 1,
FILWR,
FILEX,
FILEXIST,
FILREG,
FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
FILSYM,
FILGZ,
FILTT,
FILSUID,
FILSGID,
FILSTCK,
STREZ,
STRNZ,
FILUID,
FILGID,
FILNT = BINOP + 1,
FILOT,
FILEQ,
STREQ,
STRNE,
STRLT,
STRGT,
INTEQ,
INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
UNOT = BUNOP + 1,
BAND = BBINOP + 1,
BOR,
LPAREN = PAREN + 1,
RPAREN
};
#define TOKEN_TYPE(token) ((token) & 0xff00)
static struct t_op {
char op_text[4];
short op_num;
} const ops [] = {
{"-r", FILRD},
{"-w", FILWR},
{"-x", FILEX},
{"-e", FILEXIST},
{"-f", FILREG},
{"-d", FILDIR},
{"-c", FILCDEV},
{"-b", FILBDEV},
{"-p", FILFIFO},
{"-u", FILSUID},
{"-g", FILSGID},
{"-k", FILSTCK},
{"-s", FILGZ},
{"-t", FILTT},
{"-z", STREZ},
{"-n", STRNZ},
{"-h", FILSYM}, /* for backwards compat */
{"-O", FILUID},
{"-G", FILGID},
{"-L", FILSYM},
{"-S", FILSOCK},
{"=", STREQ},
{"==", STREQ},
{"!=", STRNE},
{"<", STRLT},
{">", STRGT},
{"-eq", INTEQ},
{"-ne", INTNE},
{"-ge", INTGE},
{"-gt", INTGT},
{"-le", INTLE},
{"-lt", INTLT},
{"-nt", FILNT},
{"-ot", FILOT},
{"-ef", FILEQ},
{"!", UNOT},
{"-a", BAND},
{"-o", BOR},
{"(", LPAREN},
{")", RPAREN},
{"", 0}
};
static int nargc;
static char **t_wp;
static int parenlevel;
static int aexpr(enum token);
static int binop(enum token);
static int equalf(const char *, const char *);
static int filstat(char *, enum token);
static int getn(const char *);
static intmax_t getq(const char *);
static int intcmp(const char *, const char *);
static int isunopoperand(void);
static int islparenoperand(void);
static int isrparenoperand(void);
static int newerf(const char *, const char *);
static int nexpr(enum token);
static int oexpr(enum token);
static int olderf(const char *, const char *);
static int primary(enum token);
static void syntax(const char *, const char *);
static enum token t_lex(char *);
int
main(int argc, char **argv)
{
int res;
char *p;
if ((p = strrchr(argv[0], '/')) == NULL)
p = argv[0];
else
p++;
if (strcmp(p, "[") == 0) {
if (strcmp(argv[--argc], "]") != 0)
error("missing ]");
argv[argc] = NULL;
}
/* no expression => false */
if (--argc <= 0)
return 1;
#ifndef SHELL
(void)setlocale(LC_CTYPE, "");
#endif
nargc = argc;
t_wp = &argv[1];
parenlevel = 0;
if (nargc == 4 && strcmp(*t_wp, "!") == 0) {
/* Things like ! "" -o x do not fit in the normal grammar. */
--nargc;
++t_wp;
res = oexpr(t_lex(*t_wp));
} else
res = !oexpr(t_lex(*t_wp));
if (--nargc > 0)
syntax(*t_wp, "unexpected operator");
return res;
}
static void
syntax(const char *op, const char *msg)
{
if (op && *op)
error("%s: %s", op, msg);
else
error("%s", msg);
}
static int
oexpr(enum token n)
{
int res;
res = aexpr(n);
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BOR)
return oexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ||
res;
t_wp--;
nargc++;
return res;
}
static int
aexpr(enum token n)
{
int res;
res = nexpr(n);
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) == BAND)
return aexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) &&
res;
t_wp--;
nargc++;
return res;
}
static int
nexpr(enum token n)
{
if (n == UNOT)
return !nexpr(t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL));
return primary(n);
}
static int
primary(enum token n)
{
enum token nn;
int res;
if (n == EOI)
return 0; /* missing expression */
if (n == LPAREN) {
parenlevel++;
if ((nn = t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL)) ==
RPAREN) {
parenlevel--;
return 0; /* missing expression */
}
res = oexpr(nn);
if (t_lex(nargc > 0 ? (--nargc, *++t_wp) : NULL) != RPAREN)
syntax(NULL, "closing paren expected");
parenlevel--;
return res;
}
if (TOKEN_TYPE(n) == UNOP) {
/* unary expression */
if (--nargc == 0)
syntax(NULL, "argument expected"); /* impossible */
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);
}
}
nn = t_lex(nargc > 0 ? t_wp[1] : NULL);
if (TOKEN_TYPE(nn) == BINOP)
return binop(nn);
return strlen(*t_wp) > 0;
}
static int
binop(enum token n)
{
const char *opnd1, *op, *opnd2;
opnd1 = *t_wp;
op = nargc > 0 ? (--nargc, *++t_wp) : NULL;
if ((opnd2 = nargc > 0 ? (--nargc, *++t_wp) : NULL) == NULL)
syntax(op, "argument expected");
switch (n) {
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 intcmp(opnd1, opnd2) == 0;
case INTNE:
return intcmp(opnd1, opnd2) != 0;
case INTGE:
return intcmp(opnd1, opnd2) >= 0;
case INTGT:
return intcmp(opnd1, opnd2) > 0;
case INTLE:
return intcmp(opnd1, opnd2) <= 0;
case INTLT:
return intcmp(opnd1, opnd2) < 0;
case FILNT:
return newerf (opnd1, opnd2);
case FILOT:
return olderf (opnd1, opnd2);
case FILEQ:
return equalf (opnd1, opnd2);
default:
abort();
/* NOTREACHED */
}
}
static int
filstat(char *nm, enum token mode)
{
struct stat s;
if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
return 0;
switch (mode) {
case FILRD:
return (eaccess(nm, R_OK) == 0);
case FILWR:
return (eaccess(nm, W_OK) == 0);
case FILEX:
/* XXX work around eaccess(2) false positives for superuser */
if (eaccess(nm, X_OK) != 0)
return 0;
if (S_ISDIR(s.st_mode) || geteuid() != 0)
return 1;
return (s.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0;
case FILEXIST:
return (eaccess(nm, F_OK) == 0);
case FILREG:
return S_ISREG(s.st_mode);
case FILDIR:
return S_ISDIR(s.st_mode);
case FILCDEV:
return S_ISCHR(s.st_mode);
case FILBDEV:
return S_ISBLK(s.st_mode);
case FILFIFO:
return S_ISFIFO(s.st_mode);
case FILSOCK:
return S_ISSOCK(s.st_mode);
case FILSYM:
return S_ISLNK(s.st_mode);
case FILSUID:
return (s.st_mode & S_ISUID) != 0;
case FILSGID:
return (s.st_mode & S_ISGID) != 0;
case FILSTCK:
return (s.st_mode & S_ISVTX) != 0;
case FILGZ:
return s.st_size > (off_t)0;
case FILUID:
return s.st_uid == geteuid();
case FILGID:
return s.st_gid == getegid();
default:
return 1;
}
}
static enum token
t_lex(char *s)
{
struct t_op const *op = ops;
if (s == 0) {
return EOI;
}
while (*op->op_text) {
if (strcmp(s, op->op_text) == 0) {
if (((TOKEN_TYPE(op->op_num) == UNOP ||
TOKEN_TYPE(op->op_num) == BUNOP)
&& isunopoperand()) ||
(op->op_num == LPAREN && islparenoperand()) ||
(op->op_num == RPAREN && isrparenoperand()))
break;
return op->op_num;
}
op++;
}
return OPERAND;
}
static int
isunopoperand(void)
{
struct t_op const *op = ops;
char *s;
char *t;
if (nargc == 1)
return 1;
s = *(t_wp + 1);
if (nargc == 2)
return parenlevel == 1 && strcmp(s, ")") == 0;
t = *(t_wp + 2);
while (*op->op_text) {
if (strcmp(s, op->op_text) == 0)
return TOKEN_TYPE(op->op_num) == BINOP &&
(parenlevel == 0 || t[0] != ')' || t[1] != '\0');
op++;
}
return 0;
}
static int
islparenoperand(void)
{
struct t_op const *op = ops;
char *s;
if (nargc == 1)
return 1;
s = *(t_wp + 1);
if (nargc == 2)
return parenlevel == 1 && strcmp(s, ")") == 0;
if (nargc != 3)
return 0;
while (*op->op_text) {
if (strcmp(s, op->op_text) == 0)
return TOKEN_TYPE(op->op_num) == BINOP;
op++;
}
return 0;
}
static int
isrparenoperand(void)
{
char *s;
if (nargc == 1)
return 0;
s = *(t_wp + 1);
if (nargc == 2)
return parenlevel == 1 && strcmp(s, ")") == 0;
return 0;
}
/* atoi with error detection */
static int
getn(const char *s)
{
char *p;
long r;
errno = 0;
r = strtol(s, &p, 10);
if (s == p)
error("%s: bad number", s);
if (errno != 0)
error((errno == EINVAL) ? "%s: bad number" :
"%s: out of range", s);
while (isspace((unsigned char)*p))
p++;
if (*p)
error("%s: bad number", s);
return (int) r;
}
/* atoi with error detection and 64 bit range */
static intmax_t
getq(const char *s)
{
char *p;
intmax_t r;
errno = 0;
r = strtoimax(s, &p, 10);
if (s == p)
error("%s: bad number", s);
if (errno != 0)
error((errno == EINVAL) ? "%s: bad number" :
"%s: out of range", s);
while (isspace((unsigned char)*p))
p++;
if (*p)
error("%s: bad number", s);
return r;
}
static int
intcmp (const char *s1, const char *s2)
{
intmax_t q1, q2;
q1 = getq(s1);
q2 = getq(s2);
if (q1 > q2)
return 1;
if (q1 < q2)
return -1;
return 0;
}
static int
newerf (const char *f1, const char *f2)
{
struct stat b1, b2;
if (stat(f1, &b1) != 0 || stat(f2, &b2) != 0)
return 0;
if (b1.st_mtimespec.tv_sec > b2.st_mtimespec.tv_sec)
return 1;
if (b1.st_mtimespec.tv_sec < b2.st_mtimespec.tv_sec)
return 0;
return (b1.st_mtimespec.tv_nsec > b2.st_mtimespec.tv_nsec);
}
static int
olderf (const char *f1, const char *f2)
{
return (newerf(f2, f1));
}
static int
equalf (const char *f1, const char *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);
}
|