ref: 53fe82ee861967f0c02dbec7901660470da79098
dir: /sys/src/ape/cmd/pdksh/c_test.c/
/*
* 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 Michael Rendell to add Korn's [[ .. ]] expressions.
* modified by J.T. Conklin to add POSIX compatibility.
*/
#include "sh.h"
#include "ksh_stat.h"
#include "c_test.h"
/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
nexpr ::= primary | "!" nexpr ;
primary ::= unary-operator operand
| operand binary-operator operand
| operand
| "(" oexpr ")"
;
unary-operator ::= "-a"|"-r"|"-w"|"-x"|"-e"|"-f"|"-d"|"-c"|"-b"|"-p"|
"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|
"-L"|"-h"|"-S"|"-H";
binary-operator ::= "="|"=="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
"-nt"|"-ot"|"-ef"|
"<"|">" # rules used for [[ .. ]] expressions
;
operand ::= <any thing>
*/
#define T_ERR_EXIT 2 /* POSIX says > 1 for errors */
struct t_op {
char op_text[4];
Test_op op_num;
};
static const struct t_op u_ops [] = {
{"-a", TO_FILAXST },
{"-b", TO_FILBDEV },
{"-c", TO_FILCDEV },
{"-d", TO_FILID },
{"-e", TO_FILEXST },
{"-f", TO_FILREG },
{"-G", TO_FILGID },
{"-g", TO_FILSETG },
{"-h", TO_FILSYM },
{"-H", TO_FILCDF },
{"-k", TO_FILSTCK },
{"-L", TO_FILSYM },
{"-n", TO_STNZE },
{"-O", TO_FILUID },
{"-o", TO_OPTION },
{"-p", TO_FILFIFO },
{"-r", TO_FILRD },
{"-s", TO_FILGZ },
{"-S", TO_FILSOCK },
{"-t", TO_FILTT },
{"-u", TO_FILSETU },
{"-w", TO_FILWR },
{"-x", TO_FILEX },
{"-z", TO_STZER },
{"", TO_NONOP }
};
static const struct t_op b_ops [] = {
{"=", TO_STEQL },
#ifdef KSH
{"==", TO_STEQL },
#endif /* KSH */
{"!=", TO_STNEQ },
{"<", TO_STLT },
{">", TO_STGT },
{"-eq", TO_INTEQ },
{"-ne", TO_INTNE },
{"-gt", TO_INTGT },
{"-ge", TO_INTGE },
{"-lt", TO_INTLT },
{"-le", TO_INTLE },
{"-ef", TO_FILEQ },
{"-nt", TO_FILNT },
{"-ot", TO_FILOT },
{"", TO_NONOP }
};
static int test_stat ARGS((const char *path, struct stat *statb));
static int test_eaccess ARGS((const char *path, int mode));
static int test_oexpr ARGS((Test_env *te, int do_eval));
static int test_aexpr ARGS((Test_env *te, int do_eval));
static int test_nexpr ARGS((Test_env *te, int do_eval));
static int test_primary ARGS((Test_env *te, int do_eval));
static int ptest_isa ARGS((Test_env *te, Test_meta meta));
static const char *ptest_getopnd ARGS((Test_env *te, Test_op op, int do_eval));
static int ptest_eval ARGS((Test_env *te, Test_op op, const char *opnd1,
const char *opnd2, int do_eval));
static void ptest_error ARGS((Test_env *te, int offset, const char *msg));
int
c_test(char **wp)
{
int argc;
int res;
Test_env te;
te.flags = 0;
te.isa = ptest_isa;
te.getopnd = ptest_getopnd;
te.eval = ptest_eval;
te.error = ptest_error;
for (argc = 0; wp[argc]; argc++)
;
if (strcmp(wp[0], "[") == 0) {
if (strcmp(wp[--argc], "]") != 0) {
bi_errorf("missing ]");
return T_ERR_EXIT;
}
}
te.pos.wp = wp + 1;
te.wp_end = wp + argc;
/*
* Handle the special cases from POSIX.2, section 4.62.4.
* Implementation of all the rules isn't necessary since
* our parser does the right thing for the ommited steps.
*/
if (argc <= 5) {
char **owp = wp;
int invert = 0;
Test_op op;
const char *opnd1, *opnd2;
while (--argc >= 0) {
if ((*te.isa)(&te, TM_END))
return !0;
if (argc == 3) {
opnd1 = (*te.getopnd)(&te, TO_NONOP, 1);
if ((op = (Test_op) (*te.isa)(&te, TM_BINOP))) {
opnd2 = (*te.getopnd)(&te, op, 1);
res = (*te.eval)(&te, op, opnd1, opnd2,
1);
if (te.flags & TEF_ERROR)
return T_ERR_EXIT;
if (invert & 1)
res = !res;
return !res;
}
/* back up to opnd1 */
te.pos.wp--;
}
if (argc == 1) {
opnd1 = (*te.getopnd)(&te, TO_NONOP, 1);
/* Historically, -t by itself test if fd 1
* is a file descriptor, but POSIX says its
* a string test...
*/
if (!Flag(FPOSIX) && strcmp(opnd1, "-t") == 0)
break;
res = (*te.eval)(&te, TO_STNZE, opnd1,
(char *) 0, 1);
if (invert & 1)
res = !res;
return !res;
}
if ((*te.isa)(&te, TM_NOT)) {
invert++;
} else
break;
}
te.pos.wp = owp + 1;
}
return test_parse(&te);
}
/*
* Generic test routines.
*/
Test_op
test_isop(Test_env *te, Test_meta meta, const char *s)
{
char sc1;
const struct t_op *otab;
otab = meta == TM_UNOP ? u_ops : b_ops;
if (*s) {
sc1 = s[1];
for (; otab->op_text[0]; otab++)
if (sc1 == otab->op_text[1]
&& strcmp(s, otab->op_text) == 0
&& ((te->flags & TEF_DBRACKET)
|| (otab->op_num != TO_STLT
&& otab->op_num != TO_STGT)))
return otab->op_num;
}
return TO_NONOP;
}
int
test_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2, int do_eval)
{
int res;
int not;
struct stat b1, b2;
if (!do_eval)
return 0;
switch ((int) op) {
/*
* Unary Operators
*/
case TO_STNZE: /* -n */
return *opnd1 != '\0';
case TO_STZER: /* -z */
return *opnd1 == '\0';
case TO_OPTION: /* -o */
if ((not = *opnd1 == '!'))
opnd1++;
if ((res = option(opnd1)) < 0)
res = 0;
else {
res = Flag(res);
if (not)
res = !res;
}
return res;
case TO_FILRD: /* -r */
return test_eaccess(opnd1, R_OK) == 0;
case TO_FILWR: /* -w */
return test_eaccess(opnd1, W_OK) == 0;
case TO_FILEX: /* -x */
return test_eaccess(opnd1, X_OK) == 0;
case TO_FILAXST: /* -a */
return test_stat(opnd1, &b1) == 0;
case TO_FILEXST: /* -e */
/* at&t ksh does not appear to do the /dev/fd/ thing for
* this (unless the os itself handles it)
*/
return stat(opnd1, &b1) == 0;
case TO_FILREG: /* -r */
return test_stat(opnd1, &b1) == 0 && S_ISREG(b1.st_mode);
case TO_FILID: /* -d */
return test_stat(opnd1, &b1) == 0 && S_ISDIR(b1.st_mode);
case TO_FILCDEV: /* -c */
#ifdef S_ISCHR
return test_stat(opnd1, &b1) == 0 && S_ISCHR(b1.st_mode);
#else
return 0;
#endif
case TO_FILBDEV: /* -b */
#ifdef S_ISBLK
return test_stat(opnd1, &b1) == 0 && S_ISBLK(b1.st_mode);
#else
return 0;
#endif
case TO_FILFIFO: /* -p */
#ifdef S_ISFIFO
return test_stat(opnd1, &b1) == 0 && S_ISFIFO(b1.st_mode);
#else
return 0;
#endif
case TO_FILSYM: /* -h -L */
#ifdef S_ISLNK
return lstat(opnd1, &b1) == 0 && S_ISLNK(b1.st_mode);
#else
return 0;
#endif
case TO_FILSOCK: /* -S */
#ifdef S_ISSOCK
return test_stat(opnd1, &b1) == 0 && S_ISSOCK(b1.st_mode);
#else
return 0;
#endif
case TO_FILCDF:/* -H HP context dependent files (directories) */
#ifdef S_ISCDF
{
/* Append a + to filename and check to see if result is a
* setuid directory. CDF stuff in general is hookey, since
* it breaks for the following sequence: echo hi > foo+;
* mkdir foo; echo bye > foo/default; chmod u+s foo
* (foo+ refers to the file with hi in it, there is no way
* to get at the file with bye in it - please correct me if
* I'm wrong about this).
*/
int len = strlen(opnd1);
char *p = str_nsave(opnd1, len + 1, ATEMP);
p[len++] = '+';
p[len] = '\0';
return stat(p, &b1) == 0 && S_ISCDF(b1.st_mode);
}
#else
return 0;
#endif
case TO_FILSETU: /* -u */
#ifdef S_ISUID
return test_stat(opnd1, &b1) == 0
&& (b1.st_mode & S_ISUID) == S_ISUID;
#else
return 0;
#endif
case TO_FILSETG: /* -g */
#ifdef S_ISGID
return test_stat(opnd1, &b1) == 0
&& (b1.st_mode & S_ISGID) == S_ISGID;
#else
return 0;
#endif
case TO_FILSTCK: /* -k */
return test_stat(opnd1, &b1) == 0
&& (b1.st_mode & S_ISVTX) == S_ISVTX;
case TO_FILGZ: /* -s */
return test_stat(opnd1, &b1) == 0 && b1.st_size > 0L;
case TO_FILTT: /* -t */
if (opnd1 && !bi_getn(opnd1, &res)) {
te->flags |= TEF_ERROR;
res = 0;
} else {
/* generate error if in FPOSIX mode? */
res = isatty(opnd1 ? res : 0);
}
return res;
case TO_FILUID: /* -O */
return test_stat(opnd1, &b1) == 0 && b1.st_uid == ksheuid;
case TO_FILGID: /* -G */
return test_stat(opnd1, &b1) == 0 && b1.st_gid == getegid();
/*
* Binary Operators
*/
case TO_STEQL: /* = */
if (te->flags & TEF_DBRACKET)
return gmatch(opnd1, opnd2, FALSE);
return strcmp(opnd1, opnd2) == 0;
case TO_STNEQ: /* != */
if (te->flags & TEF_DBRACKET)
return !gmatch(opnd1, opnd2, FALSE);
return strcmp(opnd1, opnd2) != 0;
case TO_STLT: /* < */
return strcmp(opnd1, opnd2) < 0;
case TO_STGT: /* > */
return strcmp(opnd1, opnd2) > 0;
case TO_INTEQ: /* -eq */
case TO_INTNE: /* -ne */
case TO_INTGE: /* -ge */
case TO_INTGT: /* -gt */
case TO_INTLE: /* -le */
case TO_INTLT: /* -lt */
{
long v1, v2;
if (!evaluate(opnd1, &v1, KSH_RETURN_ERROR)
|| !evaluate(opnd2, &v2, KSH_RETURN_ERROR))
{
/* error already printed.. */
te->flags |= TEF_ERROR;
return 1;
}
switch ((int) op) {
case TO_INTEQ:
return v1 == v2;
case TO_INTNE:
return v1 != v2;
case TO_INTGE:
return v1 >= v2;
case TO_INTGT:
return v1 > v2;
case TO_INTLE:
return v1 <= v2;
case TO_INTLT:
return v1 < v2;
}
}
case TO_FILNT: /* -nt */
{
int s2;
/* ksh88/ksh93 succeed if file2 can't be stated
* (subtly different from `does not exist').
*/
return stat(opnd1, &b1) == 0
&& (((s2 = stat(opnd2, &b2)) == 0
&& b1.st_mtime > b2.st_mtime) || s2 < 0);
}
case TO_FILOT: /* -ot */
{
int s1;
/* ksh88/ksh93 succeed if file1 can't be stated
* (subtly different from `does not exist').
*/
return stat(opnd2, &b2) == 0
&& (((s1 = stat(opnd1, &b1)) == 0
&& b1.st_mtime < b2.st_mtime) || s1 < 0);
}
case TO_FILEQ: /* -ef */
return stat (opnd1, &b1) == 0 && stat (opnd2, &b2) == 0
&& b1.st_dev == b2.st_dev
&& b1.st_ino == b2.st_ino;
}
(*te->error)(te, 0, "internal error: unknown op");
return 1;
}
/* Nasty kludge to handle Korn's bizarre /dev/fd hack */
static int
test_stat(const char *path, struct stat *statb)
{
#if !defined(HAVE_DEV_FD)
int fd;
if (strncmp(path, "/dev/fd/", 8) == 0 && getn(path + 8, &fd))
return fstat(fd, statb);
#endif /* !HAVE_DEV_FD */
return stat(path, statb);
}
/* Routine to handle Korn's /dev/fd hack, and to deal with X_OK on
* non-directories when running as root.
*/
static int
test_eaccess(const char *path, int mode)
{
int res;
#if !defined(HAVE_DEV_FD)
int fd;
/* Note: doesn't handle //dev/fd, etc.. (this is ok) */
if (strncmp(path, "/dev/fd/", 8) == 0 && getn(path + 8, &fd)) {
int flags;
if ((flags = fcntl(fd, F_GETFL, 0)) < 0
|| (mode & X_OK)
|| ((mode & W_OK) && (flags & O_ACCMODE) == O_RDONLY)
|| ((mode & R_OK) && (flags & O_ACCMODE) == O_WRONLY))
return -1;
return 0;
}
#endif /* !HAVE_DEV_FD */
/* On most (all?) unixes, access() says everything is executable for
* root - avoid this on files by using stat().
*/
if ((mode & X_OK) && ksheuid == 0) {
struct stat statb;
if (stat(path, &statb) < 0)
res = -1;
else if (S_ISDIR(statb.st_mode))
res = 0;
else
res = (statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH))
? 0 : -1;
/* Need to check other permissions? If so, use access() as
* this will deal with root on NFS.
*/
if (res == 0 && (mode & (R_OK|W_OK)))
res = eaccess(path, mode);
} else
res = eaccess(path, mode);
return res;
}
int
test_parse(Test_env *te)
{
int res;
res = test_oexpr(te, 1);
if (!(te->flags & TEF_ERROR) && !(*te->isa)(te, TM_END))
(*te->error)(te, 0, "unexpected operator/operand");
return (te->flags & TEF_ERROR) ? T_ERR_EXIT : !res;
}
static int
test_oexpr(Test_env *te, int do_eval)
{
int res;
res = test_aexpr(te, do_eval);
if (res)
do_eval = 0;
if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_OR))
return test_oexpr(te, do_eval) || res;
return res;
}
static int
test_aexpr(Test_env *te, int do_eval)
{
int res;
res = test_nexpr(te, do_eval);
if (!res)
do_eval = 0;
if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_AND))
return test_aexpr(te, do_eval) && res;
return res;
}
static int
test_nexpr(Test_env *te, int do_eval)
{
if (!(te->flags & TEF_ERROR) && (*te->isa)(te, TM_NOT))
return !test_nexpr(te, do_eval);
return test_primary(te, do_eval);
}
static int
test_primary(Test_env *te, int do_eval)
{
const char *opnd1, *opnd2;
int res;
Test_op op;
if (te->flags & TEF_ERROR)
return 0;
if ((*te->isa)(te, TM_OPAREN)) {
res = test_oexpr(te, do_eval);
if (te->flags & TEF_ERROR)
return 0;
if (!(*te->isa)(te, TM_CPAREN)) {
(*te->error)(te, 0, "missing closing paren");
return 0;
}
return res;
}
if ((op = (Test_op) (*te->isa)(te, TM_UNOP))) {
/* unary expression */
opnd1 = (*te->getopnd)(te, op, do_eval);
if (!opnd1) {
(*te->error)(te, -1, "missing argument");
return 0;
}
return (*te->eval)(te, op, opnd1, (const char *) 0, do_eval);
}
opnd1 = (*te->getopnd)(te, TO_NONOP, do_eval);
if (!opnd1) {
(*te->error)(te, 0, "expression expected");
return 0;
}
if ((op = (Test_op) (*te->isa)(te, TM_BINOP))) {
/* binary expression */
opnd2 = (*te->getopnd)(te, op, do_eval);
if (!opnd2) {
(*te->error)(te, -1, "missing second argument");
return 0;
}
return (*te->eval)(te, op, opnd1, opnd2, do_eval);
}
if (te->flags & TEF_DBRACKET) {
(*te->error)(te, -1, "missing expression operator");
return 0;
}
return (*te->eval)(te, TO_STNZE, opnd1, (const char *) 0, do_eval);
}
/*
* Plain test (test and [ .. ]) specific routines.
*/
/* Test if the current token is a whatever. Accepts the current token if
* it is. Returns 0 if it is not, non-zero if it is (in the case of
* TM_UNOP and TM_BINOP, the returned value is a Test_op).
*/
static int
ptest_isa(Test_env *te, Test_meta meta)
{
/* Order important - indexed by Test_meta values */
static const char *const tokens[] = {
"-o", "-a", "!", "(", ")"
};
int ret;
if (te->pos.wp >= te->wp_end)
return meta == TM_END;
if (meta == TM_UNOP || meta == TM_BINOP)
ret = (int) test_isop(te, meta, *te->pos.wp);
else if (meta == TM_END)
ret = 0;
else
ret = strcmp(*te->pos.wp, tokens[(int) meta]) == 0;
/* Accept the token? */
if (ret)
te->pos.wp++;
return ret;
}
static const char *
ptest_getopnd(Test_env *te, Test_op op, int do_eval)
{
if (te->pos.wp >= te->wp_end)
return op == TO_FILTT ? "1" : (const char *) 0;
return *te->pos.wp++;
}
static int
ptest_eval(Test_env *te, Test_op op, const char *opnd1, const char *opnd2, int do_eval)
{
return test_eval(te, op, opnd1, opnd2, do_eval);
}
static void
ptest_error(Test_env *te, int offset, const char *msg)
{
const char *op = te->pos.wp + offset >= te->wp_end ?
(const char *) 0 : te->pos.wp[offset];
te->flags |= TEF_ERROR;
if (op)
bi_errorf("%s: %s", op, msg);
else
bi_errorf("%s", msg);
}