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/* test.c - evaluate expression
*
* Copyright 2018 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
USE_TEST(NEWTOY(test, 0, TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_NOHELP))
config TEST
bool "test"
default y
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"
// Consume 3, 2, or 1 argument test, returning result and *count used.
int do_test(char **args, int *count)
{
char c, *s;
int i;
if (*count>=3) {
*count = 3;
char *s = args[1], *ss = "eqnegtgeltle";
if (!strcmp(s, "=") || !strcmp(s, "==")) return !strcmp(args[0], args[2]);
if (!strcmp(s, "!=")) return strcmp(args[0], args[2]);
if (*s=='-' && strlen(s)==3 && (s = strstr(ss, s+1)) && !((i = s-ss)&1)) {
long long a = atolx(args[0]), b = atolx(args[2]);
if (!i) return a == b;
if (i==2) return a != b;
if (i==4) return a > b;
if (i==6) return a >= b;
if (i==8) return a < b;
if (i==10) return a<= b;
}
}
s = *args;
if (*count>=2 && *s == '-' && s[1] && !s[2]) {
*count = 2;
c = s[1];
if (-1 != (i = stridx("hLbcdefgpSusxwr", c))) {
struct stat st;
// stat or lstat, then handle rwx and s
if (-1 == ((i<2) ? lstat : stat)(args[1], &st)) return 0;
if (i>=12) return !!(st.st_mode&(0x111<<(i-12)));
if (c == 's') return !!st.st_size; // otherwise 1<<32 == 0
// handle file type checking and SUID/SGID
if ((i = (unsigned short []){80,80,48,16,32,0,64,2,8,96,4}[i]<<9)>=4096)
return (st.st_mode&S_IFMT) == i;
else return (st.st_mode & i) == i;
} else if (c == 'z') return !*args[1];
else if (c == 'n') return *args[1];
else if (c == 't') return isatty(atolx(args[1]));
}
return *count = 0;
}
#define NOT 1 // Most recent test had an odd number of preceding !
#define AND 2 // test before -a failed since -o or ( so force false
#define OR 4 // test before -o succeeded since ( so force true
void test_main(void)
{
char *s;
int pos, paren, pstack, result = 0;
toys.exitval = 2;
if (!strcmp("[", toys.which->name))
if (!toys.optc || strcmp("]", toys.optargs[--toys.optc]))
error_exit("Missing ']'");
// loop through command line arguments
if (toys.optc) for (pos = paren = pstack = 0; ; pos++) {
int len = toys.optc-pos;
if (!toys.optargs[pos]) perror_exit("need arg @%d", pos);
// Evaluate next test
result = do_test(toys.optargs+pos, &len);
pos += len;
// Single argument could be ! ( or nonempty
if (!len) {
if (toys.optargs[pos+1]) {
if (!strcmp("!", toys.optargs[pos])) {
pstack ^= NOT;
continue;
}
if (!strcmp("(", toys.optargs[pos])) {
if (++paren>9) perror_exit("bad (");
pstack <<= 3;
continue;
}
}
result = *toys.optargs[pos++];
}
s = toys.optargs[pos];
for (;;) {
// Handle pending ! -a -o (the else means -o beats -a)
if (pstack&NOT) result = !result;
pstack &= ~NOT;
if (pstack&OR) result = 1;
else if (pstack&AND) result = 0;
// Do it again for every )
if (!paren || !s || strcmp(")", s)) break;
paren--;
pstack >>= 3;
s = toys.optargs[++pos];
}
// Out of arguments?
if (!s) {
if (paren) perror_exit("need )");
break;
}
// are we followed by -a or -o?
if (!strcmp("-a", s)) {
if (!result) pstack |= AND;
} else if (!strcmp("-o", s)) {
// -o flushes -a even if previous test was false
pstack &=~AND;
if (result) pstack |= OR;
} else error_exit("too many arguments");
}
// Invert C logic to get shell logic
toys.exitval = !result;
}
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