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-rw-r--r--toys/posix/test.c159
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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;
+}