Add a lot of tests for combinations of values, offsets and lengths

p4raw-id: //depot/perl@23702

1 files changed, 58 insertions, 1 deletions

diff --git a/t/op/read.t b/t/op/read.t
index aaa426d3b7..f343c0d114 100755
--- a/t/op/read.t
+++ b/t/op/read.t
@@ -9,7 +9,7 @@ BEGIN {
 }
 use strict;
 
-plan tests => 4;
+plan tests => 516;
 
 open(FOO,'op/read.t') || open(FOO,'t/op/read.t') || open(FOO,':op:read.t') || die "Can't open op.read";
 seek(FOO,4,0) or die "Seek failed: $!";
@@ -24,3 +24,60 @@ $got = read(FOO,$buf,4);
 
 is ($got, 0);
 is ($buf, "");
+
+my $tmpfile = 'Op_read.tmp';
+
+1 while unlink $tmpfile;
+
+my (@values, @buffers) = ('', '');
+
+foreach (65, 161) { # , 253, 9786) {
+    push @values, join "", map {chr $_} $_ .. $_ + 4;
+    push @buffers, join "", map {chr $_} $_ + 5 .. $_ + 20;
+}
+
+foreach my $value (@values) {
+    foreach my $initial_buffer (@buffers) {
+	my @utf8 = 1;
+	if ($value !~ tr/\0-\377//c) {
+	    # It's all 8 bit
+	    unshift @utf8, 0;
+	}
+	# foreach my $utf8 (@utf8) {
+	1 while unlink $tmpfile;
+	open FH, ">$tmpfile" or die "Can't open $tmpfile: $!";
+	print FH $value;
+	close FH;
+	foreach my $offset (0, 3, 7, 22, -1, -3, -5, -7) {
+	    foreach my $length (0, 2, 5, 10) {
+		# Will read the lesser of the length of the file and the read
+		# length
+		my $will_read = $value;
+		if ($length < length $will_read) {
+		    substr ($will_read, $length) = '';
+		}
+		# Going to trash this so need a copy
+		my $buffer = $initial_buffer;
+
+		my $expect = $buffer;
+		if ($offset > 0) {
+		    # Right pad with NUL bytes
+		    $expect .= "\0" x $offset;
+		    substr ($expect, $offset) = '';
+		}
+		substr ($expect, $offset) = $will_read;
+
+		open FH, $tmpfile or die "Can't open $tmpfile: $!";
+		printf "# %d into %d l $length o $offset\n",
+		    ord $value, ord $buffer;
+		$got = read (FH, $buffer, $length, $offset);
+		is ($got, length $will_read);
+		is ($buffer, $expect);
+	    }
+	}
+	# }
+    }
+}
+
+
+