#!./perl
-print "1..149\n";
+print "1..177\n";
#P = start of string Q = start of substr R = end of substr S = end of string
substr($x, 3, 1) eq "\x{FF}" &&
substr($x, 4, 1) eq "\x{F3}";
+# And tests for already-UTF8 one
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, 1) = "\x{100}";
+ok 150, length($x) == 3 &&
+ $x eq "\x{100}\xF2\xF3" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, 1) = "\x{100}\x{FF}";
+ok 151, length($x) == 4 &&
+ $x eq "\x{100}\x{FF}\xF2\xF3" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{FF}" &&
+ substr($x, 2, 1) eq "\x{F2}" &&
+ substr($x, 3, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, 2) = "\x{100}\xFF";
+ok 152, length($x) == 3 &&
+ $x eq "\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{FF}" &&
+ substr($x, 2, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 1, 1) = "\x{100}\xFF";
+ok 153, length($x) == 4 &&
+ $x eq "\x{101}\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{100}" &&
+ substr($x, 2, 1) eq "\x{FF}" &&
+ substr($x, 3, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 2, 1) = "\x{100}\xFF";
+ok 154, length($x) == 4 &&
+ $x eq "\x{101}\xF2\x{100}\xFF" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{100}" &&
+ substr($x, 3, 1) eq "\x{FF}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 3, 1) = "\x{100}\xFF";
+ok 155, length($x) == 5 &&
+ $x eq "\x{101}\x{F2}\x{F3}\x{100}\xFF" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{F3}" &&
+ substr($x, 3, 1) eq "\x{100}" &&
+ substr($x, 4, 1) eq "\x{FF}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, -1, 1) = "\x{100}\xFF";
+ok 156, length($x) == 4 &&
+ $x eq "\x{101}\xF2\x{100}\xFF" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{100}" &&
+ substr($x, 3, 1) eq "\x{FF}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, -1, 0) = "\x{100}\xFF";
+ok 157, length($x) == 5 &&
+ $x eq "\x{101}\xF2\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{100}" &&
+ substr($x, 3, 1) eq "\x{FF}" &&
+ substr($x, 4, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, -1) = "\x{100}\xFF";
+ok 158, length($x) == 3 &&
+ $x eq "\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{FF}" &&
+ substr($x, 2, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, -2) = "\x{100}\xFF";
+ok 159, length($x) == 4 &&
+ $x eq "\x{100}\xFF\xF2\xF3" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{FF}" &&
+ substr($x, 2, 1) eq "\x{F2}" &&
+ substr($x, 3, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 0, -3) = "\x{100}\xFF";
+ok 160, length($x) == 5 &&
+ $x eq "\x{100}\xFF\x{101}\x{F2}\x{F3}" &&
+ substr($x, 0, 1) eq "\x{100}" &&
+ substr($x, 1, 1) eq "\x{FF}" &&
+ substr($x, 2, 1) eq "\x{101}" &&
+ substr($x, 3, 1) eq "\x{F2}" &&
+ substr($x, 4, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, 1, -1) = "\x{100}\xFF";
+ok 161, length($x) == 4 &&
+ $x eq "\x{101}\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{100}" &&
+ substr($x, 2, 1) eq "\x{FF}" &&
+ substr($x, 3, 1) eq "\x{F3}";
+
+$x = "\x{101}\x{F2}\x{F3}";
+substr($x, -1, -1) = "\x{100}\xFF";
+ok 162, length($x) == 5 &&
+ $x eq "\x{101}\xF2\x{100}\xFF\xF3" &&
+ substr($x, 0, 1) eq "\x{101}" &&
+ substr($x, 1, 1) eq "\x{F2}" &&
+ substr($x, 2, 1) eq "\x{100}" &&
+ substr($x, 3, 1) eq "\x{FF}" &&
+ substr($x, 4, 1) eq "\x{F3}";
+
+substr($x = "ab", 0, 0, "\x{100}\x{200}");
+ok 163, $x eq "\x{100}\x{200}ab";
+
+substr($x = "\x{100}\x{200}", 0, 0, "ab");
+ok 164, $x eq "ab\x{100}\x{200}";
+
+substr($x = "ab", 1, 0, "\x{100}\x{200}");
+ok 165, $x eq "a\x{100}\x{200}b";
+
+substr($x = "\x{100}\x{200}", 1, 0, "ab");
+ok 166, $x eq "\x{100}ab\x{200}";
+
+substr($x = "ab", 2, 0, "\x{100}\x{200}");
+ok 167, $x eq "ab\x{100}\x{200}";
+
+substr($x = "\x{100}\x{200}", 2, 0, "ab");
+ok 168, $x eq "\x{100}\x{200}ab";
+
+substr($x = "\xFFb", 0, 0, "\x{100}\x{200}");
+ok 169, $x eq "\x{100}\x{200}\xFFb";
+
+substr($x = "\x{100}\x{200}", 0, 0, "\xFFb");
+ok 170, $x eq "\xFFb\x{100}\x{200}";
+
+substr($x = "\xFFb", 1, 0, "\x{100}\x{200}");
+ok 171, $x eq "\xFF\x{100}\x{200}b";
+
+substr($x = "\x{100}\x{200}", 1, 0, "\xFFb");
+ok 172, $x eq "\x{100}\xFFb\x{200}";
+
+substr($x = "\xFFb", 2, 0, "\x{100}\x{200}");
+ok 173, $x eq "\xFFb\x{100}\x{200}";
+
+substr($x = "\x{100}\x{200}", 2, 0, "\xFFb");
+ok 174, $x eq "\x{100}\x{200}\xFFb";
+
+# [perl #20933]
+{
+ my $s = "ab";
+ my @r;
+ $r[$_] = \ substr $s, $_, 1 for (0, 1);
+ ok 175, join("", map { $$_ } @r) eq "ab";
+}
+
+# [perl #23207]
+{
+ sub ss {
+ substr($_[0],0,1) ^= substr($_[0],1,1) ^=
+ substr($_[0],0,1) ^= substr($_[0],1,1);
+ }
+ my $x = my $y = 'AB'; ss $x; ss $y;
+ ok 176, $x eq $y;
+}
+
+# [perl #24605]
+{
+ my $x = "0123456789\x{500}";
+ my $y = substr $x, 4;
+ ok 177, substr($x, 7, 1) eq "7";
+}