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/* test.c - evaluate expression
*
* Copyright 2013 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
USE_TEST(NEWTOY(test, NULL, TOYFLAG_USR|TOYFLAG_BIN))
config TEST
bool "test"
default n
help
usage: test [-bcdefghLPrSsuwx PATH] [-nz STRING] [-t FD] [X ?? Y]
Return true or false by performing tests. (With no arguments return false.)
--- Tests with a single argument (after the option):
PATH is/has:
-b block device -f regular file -p fifo -u setuid bit
-c char device -g setgid -r read bit -w write bit
-d directory -h symlink -S socket -x execute bit
-e exists -L symlink -s nonzero size
STRING is:
-n nonzero size -z zero size (STRING by itself implies -n)
FD (integer file descriptor) is:
-t a TTY
--- Tests with one argument on each side of an operator:
Two strings:
= are identical != differ
Two integers:
-eq equal -gt first > second -lt first < second
-ne not equal -ge first >= second -le first <= second
--- Modify or combine tests:
! EXPR not (swap true/false) EXPR -a EXPR and (are both true)
( EXPR ) evaluate this first EXPR -o EXPR or (is either true)
*/
#include "toys.h"
int get_stat(struct stat *st, int *link, char* s)
{
if (lstat(s, st) == -1) return 0;
*link = S_ISLNK(st->st_mode);
if (*link && (stat(s, st) == -1)) return 0;
return 1;
}
// basic expression without !, -o, -a, (
int test_basic(int optb, int opte)
{
int id, val;
char *s, *err_fmt = "Bad flag '%s'", *err_int = "Bad integer '%s'";
if (optb == opte) val = 0;
else if (optb + 1 == opte) val = !!*toys.optargs[optb];
else if (optb + 2 == opte && toys.optargs[optb][0] == '-') {
char c = toys.optargs[optb][1];
struct stat st;
int link;
if (!c || toys.optargs[optb][2]) error_exit(err_fmt, toys.optargs[optb]);
s = toys.optargs[optb + 1];
if (c == 'b') val = get_stat(&st, &link, s) && S_ISBLK(st.st_mode);
else if (c == 'c') val = get_stat(&st, &link, s) && S_ISCHR(st.st_mode);
else if (c == 'd') val = get_stat(&st, &link, s) && S_ISDIR(st.st_mode);
else if (c == 'e') val = get_stat(&st, &link, s);
else if (c == 'f') val = get_stat(&st, &link, s) && S_ISREG(st.st_mode);
else if (c == 'g') val = get_stat(&st, &link, s) && (st.st_mode & S_ISGID);
else if (c == 'h' || c == 'L') val = get_stat(&st, &link, s) && link;
else if (c == 'p') val = get_stat(&st, &link, s) && S_ISFIFO(st.st_mode);
else if (c == 'S') val = get_stat(&st, &link, s) && S_ISSOCK(st.st_mode);
else if (c == 's') val = get_stat(&st, &link, s) && st.st_size != 0;
else if (c == 'u') val = get_stat(&st, &link, s) && (st.st_mode & S_ISUID);
else if (c == 'r') val = access(s, R_OK) != -1;
else if (c == 'w') val = access(s, W_OK) != -1;
else if (c == 'x') val = access(s, X_OK) != -1;
else if (c == 'z') val = !*s;
else if (c == 'n') val = !!*s;
else if (c == 't') {
struct termios termios;
val = tcgetattr(atoi(s), &termios) != -1;
}
else error_exit(err_fmt, toys.optargs[optb]);
}
else if (optb + 3 == opte) {
if (*toys.optargs[optb + 1] == '-') {
char *end_a, *end_b;
long a, b;
int errno_a, errno_b;
errno = 0;
a = strtol(toys.optargs[optb], &end_a, 10);
errno_a = errno;
b = strtol(toys.optargs[optb + 2], &end_b, 10);
errno_b = errno;
s = toys.optargs[optb + 1] + 1;
if (!strcmp("eq", s)) val = a == b;
else if (!strcmp("ne", s)) val = a != b;
else if (!strcmp("gt", s)) val = a > b;
else if (!strcmp("ge", s)) val = a >= b;
else if (!strcmp("lt", s)) val = a < b;
else if (!strcmp("le", s)) val = a <= b;
else error_exit(err_fmt, toys.optargs[optb + 1]);
if (!*toys.optargs[optb] || *end_a || errno_a)
error_exit(err_int, toys.optargs[optb]);
if (!*toys.optargs[optb + 2] || *end_b || errno_b)
error_exit(err_int, toys.optargs[optb + 2]);
}
else {
int result = strcmp(toys.optargs[optb], toys.optargs[optb + 2]);
s = toys.optargs[optb + 1];
if (!strcmp("=", s)) val = !result;
else if (!strcmp("!=", s)) val = !!result;
else error_exit(err_fmt, toys.optargs[optb + 1]);
}
}
else error_exit("Syntax error");
return val;
}
int test_sub(int optb, int opte)
{
int not, and = 1, or = 0, i, expr;
char *err_syntax = "Syntax error";
for (;;) {
not = 0;
while (optb < opte && !strcmp("!", toys.optargs[optb])) {
not = !not;
optb++;
}
if (optb < opte && !strcmp("(", toys.optargs[optb])) {
int par = 1;
for (i = optb + 1; par && i < opte; i++) {
if (!strcmp(")", toys.optargs[i])) par--;
else if (!strcmp("(", toys.optargs[i])) par++;
}
if (par) error_exit("Missing ')'");
expr = not ^ test_sub(optb + 1, i - 1);
optb = i;
}
else {
for (i = 0; i < 4; ++i) {
if (optb + i == opte || !strcmp("-a", toys.optargs[optb + i])
|| !strcmp("-o", toys.optargs[optb + i])) break;
}
if (i == 4) error_exit(err_syntax);
expr = not ^ test_basic(optb, optb + i);
optb += i;
}
if (optb == opte) {
return or || (and && expr);
}
else if (!strcmp("-o", toys.optargs[optb])) {
or = or || (and && expr);
and = 1;
optb++;
}
else if (!strcmp("-a", toys.optargs[optb])) {
and = and && expr;
optb++;
}
else error_exit(err_syntax);
}
}
int test_few_args(int optb, int opte)
{
if (optb == opte) return 0;
else if (optb + 1 == opte) return !!*toys.optargs[optb];
else if (optb + 2 == opte) {
if (!strcmp("!", toys.optargs[optb])) return !*toys.optargs[optb + 1];
else if (toys.optargs[optb][0] == '-' &&
stridx("bcdefghLpSsurwxznt", toys.optargs[optb][1]) != -1 &&
!toys.optargs[optb][2]) return test_basic(optb, opte);
}
else if (optb + 3 == opte) {
if (!strcmp("-eq", toys.optargs[optb + 1]) ||
!strcmp("-ne", toys.optargs[optb + 1]) ||
!strcmp("-gt", toys.optargs[optb + 1]) ||
!strcmp("-ge", toys.optargs[optb + 1]) ||
!strcmp("-lt", toys.optargs[optb + 1]) ||
!strcmp("-le", toys.optargs[optb + 1]) ||
!strcmp("=", toys.optargs[optb + 1]) ||
!strcmp("!=", toys.optargs[optb + 1])) return test_basic(optb, opte);
else if (!strcmp("!", toys.optargs[optb]))
return !test_few_args(optb + 1, opte);
else if (!strcmp("(", toys.optargs[optb]) &&
!strcmp(")", toys.optargs[optb + 2]))
return !!*toys.optargs[optb + 1];
}
else {
if (!strcmp("!", toys.optargs[optb])) return !test_few_args(optb + 1, opte);
else if (!strcmp("(", toys.optargs[optb]) &&
!strcmp(")", toys.optargs[optb + 3]))
return test_few_args(optb + 1, opte - 1);
}
return test_sub(optb, opte);
}
void test_main(void)
{
int optc = toys.optc;
toys.exitval = 2;
if (!strcmp("[", toys.which->name))
if (!optc || strcmp("]", toys.optargs[--optc])) error_exit("Missing ']'");
if (optc <= 4) toys.exitval = !test_few_args(0, optc);
else toys.exitval = !test_sub(0, optc);
return;
}
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