Method: Kernel#test

Defined in:

file.c

#test(cmd, file1[, file2]) ⇒ Object

Uses the character cmd to perform various tests on file1 (first table below) or on file1 and file2 (second table).

File tests on a single file:

Cmd    Returns   Meaning
"A"  | Time    | Last access time for file1
"b"  | boolean | True if file1 is a block device
"c"  | boolean | True if file1 is a character device
"C"  | Time    | Last change time for file1
"d"  | boolean | True if file1 exists and is a directory
"e"  | boolean | True if file1 exists
"f"  | boolean | True if file1 exists and is a regular file
"g"  | boolean | True if file1 has the \CF{setgid} bit
     |         | set (false under NT)
"G"  | boolean | True if file1 exists and has a group
     |         | ownership equal to the caller's group
"k"  | boolean | True if file1 exists and has the sticky bit set
"l"  | boolean | True if file1 exists and is a symbolic link
"M"  | Time    | Last modification time for file1
"o"  | boolean | True if file1 exists and is owned by
     |         | the caller's effective uid
"O"  | boolean | True if file1 exists and is owned by
     |         | the caller's real uid
"p"  | boolean | True if file1 exists and is a fifo
"r"  | boolean | True if file1 is readable by the effective
     |         | uid/gid of the caller
"R"  | boolean | True if file is readable by the real
     |         | uid/gid of the caller
"s"  | int/nil | If file1 has nonzero size, return the size,
     |         | otherwise return nil
"S"  | boolean | True if file1 exists and is a socket
"u"  | boolean | True if file1 has the setuid bit set
"w"  | boolean | True if file1 exists and is writable by
     |         | the effective uid/gid
"W"  | boolean | True if file1 exists and is writable by
     |         | the real uid/gid
"x"  | boolean | True if file1 exists and is executable by
     |         | the effective uid/gid
"X"  | boolean | True if file1 exists and is executable by
     |         | the real uid/gid
"z"  | boolean | True if file1 exists and has a zero length

Tests that take two files:

"-"  | boolean | True if file1 and file2 are identical
"="  | boolean | True if the modification times of file1
     |         | and file2 are equal
"<"  | boolean | True if the modification time of file1
     |         | is prior to that of file2
">"  | boolean | True if the modification time of file1
     |         | is after that of file2

Returns:

• (Object)

# File 'file.c', line 5249

static VALUE
rb_f_test(int argc, VALUE *argv, VALUE _)
{
    int cmd;

    if (argc == 0) rb_check_arity(argc, 2, 3);
    cmd = NUM2CHR(argv[0]);
    if (cmd == 0) {
      unknown:
	/* unknown command */
	if (ISPRINT(cmd)) {
	    rb_raise(rb_eArgError, "unknown command '%s%c'", cmd == '\'' || cmd == '\\' ? "\\" : "", cmd);
	}
	else {
	    rb_raise(rb_eArgError, "unknown command \"\\x%02X\"", cmd);
	}
    }
    if (strchr("bcdefgGkloOprRsSuwWxXz", cmd)) {
	CHECK(1);
	switch (cmd) {
	  case 'b':
	    return rb_file_blockdev_p(0, argv[1]);

	  case 'c':
	    return rb_file_chardev_p(0, argv[1]);

	  case 'd':
	    return rb_file_directory_p(0, argv[1]);

	  case 'e':
	    return rb_file_exist_p(0, argv[1]);

	  case 'f':
	    return rb_file_file_p(0, argv[1]);

	  case 'g':
	    return rb_file_sgid_p(0, argv[1]);

	  case 'G':
	    return rb_file_grpowned_p(0, argv[1]);

	  case 'k':
	    return rb_file_sticky_p(0, argv[1]);

	  case 'l':
	    return rb_file_symlink_p(0, argv[1]);

	  case 'o':
	    return rb_file_owned_p(0, argv[1]);

	  case 'O':
	    return rb_file_rowned_p(0, argv[1]);

	  case 'p':
	    return rb_file_pipe_p(0, argv[1]);

	  case 'r':
	    return rb_file_readable_p(0, argv[1]);

	  case 'R':
	    return rb_file_readable_real_p(0, argv[1]);

	  case 's':
	    return rb_file_size_p(0, argv[1]);

	  case 'S':
	    return rb_file_socket_p(0, argv[1]);

	  case 'u':
	    return rb_file_suid_p(0, argv[1]);

	  case 'w':
	    return rb_file_writable_p(0, argv[1]);

	  case 'W':
	    return rb_file_writable_real_p(0, argv[1]);

	  case 'x':
	    return rb_file_executable_p(0, argv[1]);

	  case 'X':
	    return rb_file_executable_real_p(0, argv[1]);

	  case 'z':
	    return rb_file_zero_p(0, argv[1]);
	}
    }

    if (strchr("MAC", cmd)) {
	struct stat st;
	VALUE fname = argv[1];

	CHECK(1);
	if (rb_stat(fname, &st) == -1) {
	    int e = errno;
	    FilePathValue(fname);
	    rb_syserr_fail_path(e, fname);
	}

	switch (cmd) {
	  case 'A':
	    return stat_atime(&st);
	  case 'M':
	    return stat_mtime(&st);
	  case 'C':
	    return stat_ctime(&st);
	}
    }

    if (cmd == '-') {
	CHECK(2);
	return rb_file_identical_p(0, argv[1], argv[2]);
    }

    if (strchr("=<>", cmd)) {
	struct stat st1, st2;
        struct timespec t1, t2;

	CHECK(2);
	if (rb_stat(argv[1], &st1) < 0) return Qfalse;
	if (rb_stat(argv[2], &st2) < 0) return Qfalse;

        t1 = stat_mtimespec(&st1);
        t2 = stat_mtimespec(&st2);

	switch (cmd) {
	  case '=':
	    if (t1.tv_sec == t2.tv_sec && t1.tv_nsec == t2.tv_nsec) return Qtrue;
	    return Qfalse;

	  case '>':
	    if (t1.tv_sec > t2.tv_sec) return Qtrue;
	    if (t1.tv_sec == t2.tv_sec && t1.tv_nsec > t2.tv_nsec) return Qtrue;
	    return Qfalse;

	  case '<':
	    if (t1.tv_sec < t2.tv_sec) return Qtrue;
	    if (t1.tv_sec == t2.tv_sec && t1.tv_nsec < t2.tv_nsec) return Qtrue;
	    return Qfalse;
	}
    }
    goto unknown;
}