[xslt] floor(), ceiling(), and round() functions and negative values

[Ardo van Rangelrooij <ardo debian org>]

Hi,

Another bug report files against the Debian package of libxslt is about
the floor(), ceiling(), and round() functions and negative values.

given the XML file

    <?xml version="1.0"?>
    <testdata>
	<datum val="-0"     f="-0" c="-0" r="-0"/>
	<datum val="-0.4"   f="-1" c="-0" r="-0"/>
	<datum val="-0.5"   f="-1" c="-0" r="-0"/>
	<datum val="-0.6"   f="-1" c="-0" r="-1"/>
    </testdata>

and the XSLT stylesheet

    <?xml version="1.0"?>
    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
	<xsl:output method="text"/>
	<xsl:variable name="nl"><xsl:text>
    </xsl:text></xsl:variable>
	<xsl:template match="/">
	    <xsl:for-each select="//datum">
		<xsl:value-of select="concat('floor(', @val, ')   = ', floor(@val), ' (should be ', @f, ')', $nl)"/>
		<xsl:value-of select="concat('ceiling(', @val, ') = ', ceiling(@val), ' (should be ', @c, ')', $nl)"/>
		<xsl:value-of select="concat('round(', @val, ')   = ', round(@val), ' (should be ', @r, ')', $nl, $nl)"/>
	    </xsl:for-each>
	</xsl:template>
    </xsl:stylesheet>

the following output is generated with libxslt v1.0.27:

    floor(-0)   = 0 (should be -0)
    ceiling(-0) = 0 (should be -0)
    round(-0)   = 0 (should be -0)

    floor(-0.4)   = -1 (should be -1)
    ceiling(-0.4) = 0 (should be -0)
    round(-0.4)   = 0 (should be -0)

    floor(-0.5)   = -1 (should be -1)
    ceiling(-0.5) = 0 (should be -0)
    round(-0.5)   = 0 (should be -0)

    floor(-0.6)   = -1 (should be -1)
    ceiling(-0.6) = 0 (should be -0)
    round(-0.6)   = -1 (should be -1)

while sablotron v0.97 generates

    floor(-0)   = -0 (should be -0)
    ceiling(-0) = -0 (should be -0)
    round(-0)   = 0 (should be -0)

    floor(-0.4)   = -1 (should be -1)
    ceiling(-0.4) = -0 (should be -0)
    round(-0.4)   = 0 (should be -0)

    floor(-0.5)   = -1 (should be -1)
    ceiling(-0.5) = -0 (should be -0)
    round(-0.5)   = 0 (should be -0)

    floor(-0.6)   = -1 (should be -1)
    ceiling(-0.6) = -0 (should be -0)
    round(-0.6)   = -1 (should be -1)

and xalan v1.2 produces

    floor(-0)   = 0 (should be -0)
    ceiling(-0) = 0 (should be -0)
    round(-0)   = 0 (should be -0)

    floor(-0.4)   = -1 (should be -1)
    ceiling(-0.4) = -0 (should be -0)
    round(-0.4)   = 0 (should be -0)

    floor(-0.5)   = -1 (should be -1)
    ceiling(-0.5) = -0 (should be -0)
    round(-0.5)   = 0 (should be -0)

    floor(-0.6)   = -1 (should be -1)
    ceiling(-0.6) = -0 (should be -0)
    round(-0.6)   = -1 (should be -1)

None of them gets it completely right, though.

Are these indeed bugs?  If so, I'll file an official bug report.

Thanks,
Ardo
-- 
Ardo van Rangelrooij
home email: ardo@debian.org
home page:  http://people.debian.org/~ardo
GnuPG fp:   3B 1F 21 72 00 5C 3A 73  7F 72 DF D9 90 78 47 F9
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